tev 2000 - michigan state university · (both proton-antiproton, 2 tev in the cm) run ii (proposed...
TRANSCRIPT
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000
tev_2000tev_2000
repo
rt from
the e x t e n
d e d
wo
rksho
pChip B
rockM
ichigan State University
for: Dan A
midei and the
workshop participants
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000w
hat w
e were...
Octo
ber, 1994 a g
rou
p o
f 100 users &
friend
s d
edicated
time th
ey did
n’t h
ave to u
nravelin
g th
e p
hysics p
oten
tial of an
up
grad
ed F
ermilab
●T
wo goals:
●to quantify the physics reactions of interest, quantify the signal and background sensitivities, and identify the prim
ary detector challenges
●to create a literature w
hich documented that w
ork
●w
e think that we’ve succeeded
●T
he efficiency of completion w
as high: about 100 physicists attended the original w
orkshop and there are >70 authors to the report.
●T
his says something about this laboratory’s unique user com
munity
and support base.
●T
here is considerable loyalty to U.S. - based hadron physics.
and
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000In
trod
uctio
n
3 prem
ises:1. It didn’t m
ake sense to ignore Ferm
ilab’s physics potential in any discussion of the futurem
any o
f us h
ave a con
cern fo
r ●
the possible timeliness of im
portant physics,●
the schedule of LH
C, and
●the m
aintenance of a healthy and balanced U.S. program
at home.
2. Top P
hysics should remain a dom
inant focus of an FN
AL
program
3. Something unusual could happen - it does all the tim
e
the stren
gth
s of th
e fermilab
facility are:●
TH
ER
E’S D
AT
A H
ER
E
●and there appears to be a breadth and depth to the physics accessible at a high lum
inosity Tevatron upgrade -
it is a Pro
gram
Pro
gram
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000accelerato
r param
eters
Scen
arios (b
oth
pro
ton
-antip
roto
n, 2 T
eV in
the cm
)●
Run II (proposed C
DF
/DO
upgrades)●
Lum
inosityL
= 1032 cm
-2 s-1
●bunch characteristics
36 bunches; 396 ns; 3 int/crossing
●T
otal exposureò L
dt = 2 fb-1
●w
ay beyond (“reasonable” CD
F/D
O upgrades)
●L
uminosity
L = 10
33 cm-2 s
-1
●bunch characteristics
99 bunches; 192 ns; 9 int/crossing
●T
otal exposure ò L
dt = 100 fb-1
●interm
ediate (“incremental” C
DF
/DO
upgrades)●
Lum
inosityL
= >1032 cm
-2 s-1
●bunch characteristics
36 bunches; 396 ns; 3 int/crossingor ~99 bunches; 132ns?; 1 int/crossing?
●T
otal exposure ☞
ò Ldt
‡ 10 fb
-1
(caveats include increased cm energy and/or 19n
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000
To
p Q
uark P
hysics
To
p Q
uark P
hysics
D. A
mid
ei, Un
iversity of M
ichig
an
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000to
p q
uark p
hysics
no
w th
at we’ve fo
un
d it...
●w
e understand the gross properties, but the decades of the top quark are just beginning
●w
e know generally how
it’s made here and “there”....
for high mass,
dominant at Ferm
ilab of lesser im
portance at Ferm
ilab...dom
inant at LH
C
tt
bb
gg
g
W
W +-
qqg
tt
W bb
W +-
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000• quick sum
mary •
top
qu
ark ph
ysics at fermilab
will b
e timely an
d
un
iqu
e●
a detector with rate capability com
parable to CD
F/D
O upgrades
with
ò Ldt
‡ 10 fb
-1 will
●determ
ine mt to 2 G
eV/c
2 per experiment
●m
easure s
(tt ) to 6%●
measure B
R(t
fi b ) to 5%
●probe for tt resonant states to 1 T
eV/c
2
●probe W
tb couplings with few
% precision
●isolate single-top produced final states and
•determine
s to 10%
•determine
G(t
fi W
b ) to 12%•determ
ine Vtb to 6%
•search for anomolous couplings and C
P●
probe for rare decays to levels of 10-3 - 10
-4
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000t t yield
s
detecto
r assum
ptio
ns (C
DF
):●
Run 1b benchm
ark, extrapolation to Run II param
eters:■ g
eom
. acceptan
ce imp
rovem
ents to
lepto
n id
and
SV
X■ th
ird-view
add
ition
to S
VX
Run 1b
(%)
fiRun II
(%)
b-tag eff. incl geometrical ac
b(SVX)
44
fi60
b(SLT)
13
fi13
+ det. acc., for SVX or SL
e (t
tfi 1b+X)
53
fi85
e (t
tfi 2b+X)
13
fi42
Run 1b
(%)
fiRun II
(%)
kinematical cut acceptance
e (ll)
16
fi23
e (l+3
j)29
fi35
e (l+4
j)25
fi30
Run 1b
(%)
fiRun II
(%)
at least one b tagged
ttfi
l+3
j & 1b
15
fi29
ttfi
l+4
j & 1b
13
fi25
both b’s tagged
ttfi
l+4
j & 2b
3.2
fi13
m t =
170-175 GeV
/c2
BR • eff
Run 1b
(%)
fiRun II
(%)
no b tagged
ttfi
ll
0.8
fi1.1
ttfi
l+3
j8.7
fi10
ttfi
l+4
j7.5
fi8.9
at least one b tagged
ttfi
l+3
j & 1b
4.5
fi8.6
ttfi
l+4
j & 1b
3.9
fi7.6
both b’s tagged
ttfi
l+4
j & 2b
1.0
fi3.8
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000yield
s, con
t.
large q
uality sam
ples are co
nceivab
le
1 fb -1
10 fb -1
100 fb -1
tt produced
6800
68,000680,000
ttfi
ll
82
820
8200
ttfi
l+3
j680
6800
68,000
ttfi
l+4
j605
6000
60,500
ttfi
l+3
j & 1b
584
5800
58,400
ttfi
l+4
j & 1b
517
5200
51,700
ttfi
l+4
j & 2b
258
2600
25,800
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000m
ass: l + j
we kn
ow
ho
w to
do
this:
mt = 176/170
– 8/15 – 10/10 ; C
DF
/DO
●...and w
e know how
to make it system
atically betterred
uctio
n o
f com
bin
atoric effects &
jet energ
y scale●
double tagging●
Z fi
ee + 1j and W
fi
jj -d m
t [GeV
/c 2 ] » (1.0)
· d E
(jetscale)[%]
0
0.02
0.04
0.06
0.08
0.1
0.12
0.14
0.16
80100
120140
160180
200220
240260
280R
econ
structed
To
p M
ass (GeV
/c2)
Entries/5 GeV/c2
Reconstructed M
jj (GeV
/c2)
Events/10 GeV/c2
0 10 20 30 40 50 60
025
5075
100125
150175
200
d M
W» 1.3 G
eV/c
2 , leading to d E
(jet scale) » 3%
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000m
ass: l + j, co
nt.
precisio
n an
ticipated
:
0.7 fb
-1
1 fb -1
10 fb -1
jet scale - QCD7.7
2.0
0.6
“SQRT(N)”
jet scale - cal3.1
0.8
0.3
“SQRT(N)”
jet scale - total
8.3
2.1
0.7
“SQRT(N)”
jet scale - total
-3.3
1.0
“realistic”
b - tagging bias2.4
0.6
0.2
background shp1.6
1.6
0.6
fitting
3.1
00
MC stat
3.1
00
TOTAL
10
3.7
1.2
“realistic”
0.7 fb
-1
1 fb -1
10 fb -1
statistical uncertainties (GeV/c
2)ttfi
l+4
j12
1.6
0.5
“SQRT(N)”
ttfi
l+4
j & 1b
81.5
0.5
“SQRT(N)”
ttfi
l+4
j & 2b
25
1.7
0.5
“SQRT(N)”
systematic uncertainties (GeV/c
2)ttfi
l+4
j & 1b
10
2.5
0.8
“SQRT(N)”
ttfi
l+4
j & 1b
10
3.7
1.2
“realistic”
TOTAL (GeV/c 2)
13
4.0
1.3
“realistic”
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000m
ass: l l
we kn
ow
ho
w to
do
this to
o...h
arder?
●...and w
e know how
to make it system
atically better - same
problems
redu
ction
of co
mb
inato
ric effects●
future double tagging
jet energ
y scale & Q
CD
mo
delin
g●
currently, d E
(jet scale) » 10%
Þ
d m
t » 7%
●sam
e studies as before
●anticipate significant reduction...
d m t fi
1%
0.7 fb
-1
1 fb -1
10 fb -1
statistical uncertainties (GeV/c
2)ttfi
ll
25
6.2
2“SQRT(N)”
systematic uncertainties (GeV/c
2)jet energy scale11
2.7
0.9
QCD generator
9-
-bckgnd norm.
41
0.3
MC statistics
5-
-
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000p
rod
uctio
n:
s &
tt reson
ances
we kn
ow
ho
w to
do
this
●...and w
e know how
to make it system
atically better (eg, l + jets)
better u
nd
erstand
ing
of accep
tance (n
ow
» 30%
)●
ISR, jet energy scale, b-tagging efficiency (sound fam
iliar?)
better u
nd
erstand
ing
of b
ackgro
un
ds (n
ow
» 35%
)●
heavy flavor content of W + jets events (sound fam
iliar?)●
need to measure c and b content vs nj w
ith ct distributions
better u
nd
erstand
ing
of
ò Ld
t (no
w » 10%
)
1 fb -1
%10 fb -1
%100 fb -1
%acceptance
8.4
2.7
0.9
backgrounds
10
3.3
1.0
ò L dt
55
5
overall
s (t
t) precision
11
5.9
5.1
current theoretical prediction » 10 - 14%
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000
Mtt G
eV/c
2
σ∗B (pb)
1 fb-1
10 fb-1
100 fb-1
Min σ∗B
(X→
tt) for a resonanceto be observed at the 5σ
level.
TopC
olor Z‘, Γ
=1.2%
TopC
olor Z‘, Γ
=10%
10-2
10-1
1
400500
600700
800900
1000M
tt GeV
/c2
p
Events/25 GeV/c2
MZ
‘ = 800 G
eV/c
2
Num
ber of Evts in 700-M
tt -900O
bserved: 87E
xpected SM T
op: 17
Dashed L
ine: Fit from 400-600
1 10 102
400500
600700
800900
1000
pro
du
ction
: tt reson
ances
we’re learn
ing
ho
w to
do
this
●crucially im
portant to search - qq annihilation unique
●m
odels with predictions: color octet V
; multiscale technicolor...
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000
cos(θ
e*)
decays: W
tb vertex
do
n’t h
ave experien
ce here...M
ichel an
alysis●
SM fixes the vertex:
standard V-A
rather strict predictions:
BR
(t fi
b WL
ong ) fixed, dep. on mt
tb
W -
Γ(
)
.
tWb
Gm
VMm
Mm
Ft
tb
Wt
Wt
→=
−
+
=
322
222
82
11
2
18 π GeV
dNddN
d
e
e
e
e
()
(cos
)sin
()
(cos
)(
cos
)
*
*
*
*
Long
Left
θθ
θθ
∝∝−
2
21
dNd
e
e
()
(cos
)(
cos
)*
*Right
θθ
∝+1
2
here?
1 fb -1
10 fb -1
100 fb -1
d BR[t fi bW(Long)] %
6.5
2.1
0.7
d BR[t fi bW(Right)] %
2.6
0.8
0.3
statistical errors
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000d
ecays: B(t
fi b
), Vtb , &
B(t
fi W
)
we kn
ow
ho
w to
do
this
●3 m
ethods: (double b-tags):(single b-tags); (ll w
/tag: ll w
/out tag); &
intersection of tagging algorithms - all give:
which can be extrapolated to |V
tb |
BRt
Wb
tW
b
tW
V
VV
V
tb
td
ts
tb
(())
→=
→→=
++
and
all
2
22
2
1 fb -1
10 fb -1
100 fb -1
single/
double
different/
same jet
ll w tag/
ll no tag
single/
double
different/
same jet
ll wtag/
ll no tag
single/
double
different/
same jet
ll w tag/
ll
no tag
ratio
0.94–.07
2.3–.4
4.9–1.40.895–.0222.19–.08
5.1–.5
0.895–.0072.189–.0255.10–.15
d B(t
fi b)
4%
14%
4.5%
1.8%
2.6%
1.4%
0.56%
0.81%
0.45%
overall
d B(t
fi b)
3.3%
1.0%
0.33%
limits on
|V(tb)|
95%CL
> 0.22
> 0.40
> 0.71
for δ B(t →
b), all methods com
bined, CD
F already has ±30% (stat) and ±11%
(sys) in 67 pb-1
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000 decays: B
(t fi
W) &
sensitivity to
rare decays
it mu
st be tested
that W
’s occu
r in all to
p fin
al states
●SM
decays would require that R
l = ll /
l events be = 1/6rep
resent as B
R(t
fi b
“with
a W ”)
●also, specific m
odel-dependent sensitivities can be estimated...
1 fb -1
10 fb -1
100 fb -1
d BR(t fi b with
W)
10%
3.5%
1.0%
t fi H
–b
BR(t fi H
–b)
@ 95% CL
15%
6%
1.7%
t fi c g
l + g + 2j limit (x10
-3)
5.7
0.62
0.13
g + 4j limit (x10
-3)
6.5
1.1
0.24
overall limit (x10
-3)
3.0
0.4
0.084
t fi Z c
3l + 2j limit (x10
-3)
43
7.4
1.0
2l + 4j limit (x10
-3)
26
7.9
1.7
overall limit (x10
-3)
15
3.8
0.63
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000
0.1 1 10 30
100120
140160
180200
220240
√s = 2.0 TeV
Cross Section σ [pb]
Top Q
uark Mass
mt [G
eV]
pp → tt +
X
pp → t and
t +X
pp → tq and
tq+ X
pp → tb and
tb+ X
pp → tW
– andtW
+ + X
W
b
W t
qq’g
lν
b
b
electrow
eak pro
du
ction
of to
p
variation
s on
2 them
es:
“ W- gluon fusion ”
“ W * ”
polarized
tW
b
b
W
*
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000yield
s, backg
rou
nd
s
this w
ill beco
me im
po
rtant w
ith in
creasing
lu
min
osity
●D
O resolutions;
●50%
b-tagging efficiency + 0.4%
mistag rate;
●W
bb backgrounds scaled to CD
F
measurem
ents; ●
strategy for assignment of tagged b’s;
●sign of top can be inferred, and used to suppress background.
ON
ET
OP M
onte Carlo
Mt =
170 GeV
Top M
ass (GeV
)
Events/5 GeV/fb-1
0 5 10 15 20 25
5075
100125
150175
200225
250275
300
mt = 170 GeV/c
21 fb -1
10 fb -1
100 fb -1
W b b bckgnd
109
1000
10,000
W j j
bckgnd
109
1000
10,000
tt bckgnd
21
200
2000
single top
107
1000
10,000
M(W
b )within 50 G
eV/c
2 window
of m t
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000G
, W* , V
tb
amo
ng
measu
remen
ts:●
width - total rate is proportional to
so, get a direct measure of total w
idth (within SM
) to compare to tt
measurem
ent of BR
(t fi
b) and Vtb .
●W
-g fusion and W*...(latter less prone to theoretical uncertainties)
tb
W -
2
mt = 170 - 175
GeV/c 2
2 fb -1
10 fb -1
100 fb -1
W-gluon fusion
S/B = 0.45
stat error %
12.3
5.5
1.7
d s
%
26
10
7d G(t
fi Wb) %
d |V tb | %
14
65
W*
S/B = 0.69
stat error %
39
17
5.5
d |V tb | %
5
...plus, Long W
and CP
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000N
LC
& L
HC
LH
C●
done during early running (capable b-tagging there)
●significant statistical advantage
●w
hat are the uncertainties which don’t scale as SQ
RT
(N)?
●Q
CD
modeling...hard gluon radiation?
●system
atics from top p
t ? from gluon source, as opposed to qq?
mu
ch o
f this w
ork can
be d
on
e at fermilab
first, and
with
fu
ll systematic co
ntro
l based
on
imm
ediate exp
erience.
●W
* for Vtb w
ill be hard at LH
C - a gluon collider
NL
C●
no onia resonance, so production cross section is smooth
●threshold m
easurements dependent on beam
systematics...likely
late in the program●
500 MeV
/c2 precision advertised at Ecm = 500 G
eV
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000
Interm
ediate V
ector B
oso
n P
hysics
Interm
ediate V
ector B
oso
n P
hysics
U. B
aur, U
niversity o
f New
Yo
rk, Bu
ffaloM
. Dem
arteau, F
ermilab
S. E
rrede, U
niversity o
f Illino
is
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000IV
B p
hysics: yield
s
W’s, Z
’,s and
g’s - m
asses, decay’s, an
d co
up
ling
s: F
NA
L is a vecto
r bo
son
factory.
●standard C
DF
/DO
cuts, efficiencies, lepton id...
a stagg
ering
samp
le size, a sou
rce of p
hysics in
and
of
itself as well as a system
atics too
lkit for to
p, h
igg
s, susy,
exotics stu
dies.
pp _
fi X +
additional cuts
1 fb -1
10 fb -1
W fi e n
0.6M
6.4M
Z fi e e
74k
0.74M
W(fi e
n)g
ET (
g) > 10GeV, |
h(g)| < 2.4480
4800
Z(fi ee)
gET (
g) > 10GeV, |
h(g)| < 2.4150
1500
Z(fi
nn)g
ET (
g) > 40GeV, |
h(g)| < 1
110
1100
W(fi
en)W(fi
mn)
50
500
W(fi
ln)Z(fi
ll)
20
200
Z(fi
ll)Z(fi
ll)
330
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000• quick sum
mary •
IVB
ph
ysics at fermilab
will b
e timely an
d
com
plem
entary to
oth
er futu
re facilities●
with 10 fb
-1, a measurem
ent of MW
to 20-30 MeV
/c2
●com
bined with 2 G
eV/c
2 top measurem
ent, bounding of MH is possible
to 40-50% of M
H
●in good tim
e for direct searches
●G
(W) to 15 M
eV - m
uch better than LE
PII
●asym
metries (W
and Z) as constraint on pdfs
●W
WV
& Z
g (g,Z
) couplings comparable or m
uch better than LE
PII
●radiation zero in W
g production - unique potential
●rare W
decays
●C
P
●quartic gauge couplings
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000M
W
we kn
ow
ho
w to
do
this...
MW
= 80.41 / 80.33 – 0.180 / 0.270 C
DF
/DO
●...and w
e know how
to make it system
atically betterm
ore Z
statisticsb
etter un
derstan
din
g o
f mo
del u
ncertain
ties●
both will com
e for “free” with m
ore running
●H
owever, at higher instantaneous lum
inosities, effects from
multiple interactions w
ill become serious
●w
ill degrade the ET resolution and therefore m
T
IC
» 3[9] for L = 10
32 [1033 ] cm
-2 s-1 at 395 [132] ns bunch spacing
●group found roughly that:
DM
W|sys
» (17.9 GeV
/c2)
Ö(IC / N
)1 fb -1
10 fb -1
IC3
9
statistical MeV/c
229
17
systematic MeV/c
242
23
Total MeV/c
251
29
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000M
W co
nt.
●m
ultiple interactions were sim
ulated by overlapping min bias
events
●sufficient statistics to m
easure MW
in alternative ways; p
T (l ), E
e , etc.
0
500
1000
1500
2000
2500
3000
3500
4000
4050
6070
8090
100110
120
IC = 1IC = 3IC = 9
Tran
sverse Mass (G
eV/c
2)
Events/GeV
Scalin
g o
f W-m
ass error
1 10 10210
102
103
104
105
∫ L d
t (pb
-1)
∆MW (MeV)
Ru
n 1A
, CD
F, D
Ø, U
A2 (p
relimin
ary)
Ru
n 1b
, CD
F, D
Ø (an
ticipated
)
Scalin
g
+ resolu
tion
+ systematics
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000clo
sing
in...
stressing
the S
M is th
e gam
e
80
80.1
80.2
80.3
80.4
80.5
80.6
80.7
80.8
80.9 81140150
160170
180190
200210
220
p
10 fb-1 data, √s =
2 TeV
MW
= 80.260 ± 0.030 G
eV/c
2
Mtop =
176.0 ± 2.0 GeV
/c2
Mtop (G
eV/c
2)
MW (GeV/c2)
“Ferm
ilab Measurables”
current
80.2
80.25
80.3
80.35
80.4
80.45
80.5100200
300400
500600
700800
9001000
gg
10 fb-1 data, √s =
2 TeV
MW
= 80.260 ± 0.030 G
eV/c
2
Mtop =
176.0 ± 2.0 GeV
/c2
MH
iggs (GeV
/c2)
MW (GeV/c2)
...a different slice
currently...no resolutionon this scale
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000G
(W)
we kn
ow
ho
w to
do
this...
●traditional m
ethod will bottom
out on theoretical uncertainties
●direct m
easurement from
the mT distribution w
ill win
1 fb -1
10 fb -1
IC3
9
statistical MeV
40
13
background MeV
85
pT (W
) MeV
17
8
energy scale MeV
63
electron energy
resolution MeV
10
8
E /T resolution MeV
14
8
Total MeV
48
20
direct measurem
ent of Γ(W
)
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000asym
metries
we kn
ow
ho
w to
do
this...
●W
asymm
etries now are a definitive constraint on pdf’s
●Z
asymm
etries will likew
ise restrict allowable pdf’s
●both tim
ely and in pace with the pursuit of 30 M
eV/c
2 in d M
W
●also a com
plementary, largely uncorrelated E
W constraint
(a)(b)
0.229
0.2295
0.23
0.2305
0.231
0.2315
0.232
0200
400600
8001000
ffgg
10 fb-1 data, √s =
2 TeV
sin2Θ
efflept(M
Z 2) = 0.23143 ± 0.00032
MZ =
91.1887 ± 0.0044 GeV
/c2
Mtop =
176.0 ± 2.0 GeV
/c2
MH
iggs (GeV
/c2)
sin2Θefflept(MZ
2)
1 fb -1
10 fb -1
100 fb -1
dsin 2
q eff (stat)
–0.001
–0.00032–0.00010
d M
H » 50%
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000C
P
pp
is a CP
eigen
state●
uniquely Ferm
ilab situation, top physics...
●10k events
fi few
% asym
metries, som
e model discrim
ination
●...plus out-of-decay-plane/ in-plane m
easurements in tt
●a sim
ilar asymm
etry is measurable in pp
fi W
– X
fi
l
–
n X ” s
–
A
pptX
pptX
pptX
pptX
At
bW
tbW
tbW
tbW
tbW
=→
−→
→+
→≈
=→
−→
→+
→
+−
+−
σσ
σσ
()
()
()
()
()
()
()
()
ΓΓ
ΓΓ
˜(
)R
y
ddy
ddy
ddy
ddy
yy
yy
yy
yy
20
00
00
≡
−+
+−
+−
==−
==−
σσ
σσ
ll
ll
ll
ll
inclusive W
–
fi e–
n
Λ =
1 TeV
& sinφ =
1
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000d
i-bo
son
pro
du
ction
we kn
ow
ho
w to
do
this
●steady accum
ulation of low-background data crucial
●glossary:m
ost g
eneral W
WV
(g o
r Z) in
teraction
s:●
(¶W
)WV
proportional to g1 V
( = 1 in SM)
●W
WV
proportional to k V
( = 1 in SM)
●(¶W
)(¶W
)(¶V
) proportional to
l V
( = 0 in SM)
●e
mnrs
¶
rWm
Wn V
s proportional to g
5 V ( = 0 in SM
)
mo
st gen
eral Zg V
(g o
r Z) vertex
●characterized by tw
o free parameters
h
3 V and h4 V (= 0 in SM
)
●W
g, Zg, W
W, and W
Z candidates have been seen
Wg and Z
g have backgrounds from W
/Z+ j(fluctuating to
p 0)
WW
, WZ
fi
ln jj and Z
W fi
ll jj likew
ise (involves jj cuts)
WW
fi
ln
ln has tt backgrounds
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000W
g
limits w
ill imp
rove d
ramatically
current limits
Wg
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000W
W, W
Z
current limits
WW
, WZ
fi
ln jj and Z
W fi
ll jj
WW
fi
ln
ln and W
Z fi
l
l +
pT
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000rad
iation
zero
classically: dip
ole rad
iation
for th
e scattering
of tw
o
charg
ed p
articles vanish
es wh
en Q
1 /m1 = Q
2 /m2
●this “radiation zero” persists to relativistic and quantum
m
echanical situations where the condition for
the “null zone” is which
for E1 = E
2 , happens at for u and d annihilation , u d
fi W
g
●a variety of non-standard effects w
ill spoil this null zone, and confirm
ation is a fundamental test of the gauge invariance and
structure of the SM●
the cm angle is difficult, but rapidity correlations in the laboratory
frame
●this is a pp favorable m
easurement...unaffected by N
LO
corrections, doable w
ith precision lepton id.
12
3
qθ
Qpq
Qpq
1
1
2
2⋅
=⋅
cosθ
=+−
=±
12
12
13
Q 1 +
Q 2 =
Q 3
p 1 + p 2 =
p 3 + q
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000W
g zero, co
nt.
y(γ) - y(l +)
0 10 20 30 40 50 60
-4-2
02
4
AL
LC
HA
N 327.3
y(γ) - y(l +)
0 5 10 15 20 25 30
-4-2
02
4
AL
LC
HA
N 108.4
central + endcap electrons
central electrons only
one of the numerous places that high-prem
ium m
ay be placed on large-rapidity leptonsin the upgrades (top, M
W, asym
metries, di-bosons, etc.)
y(γ) - y(l +)
0 10 20 30 40 50 60
-4-2
02
4
AL
LC
HA
N 327.3
y(γ) - y(l +)
0 5 10 15 20 25 30
-4-2
02
4
AL
LC
HA
N 108.4
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000L
EP
II, LH
C
●M
W: im
portant tev33 measurem
ent, maybe unique
●L
EP
II advertises » 40 M
eV/c
2 from threshold (tev33, 20-30 M
eV/c
2)
●G
W : unique tev33 m
easurement
●L
EP
II advertises »
400 MeV
(tev33, few 10’s M
eV)
●A
FB : com
plementary tev33 m
easurements, system
atic tool●
LE
PII/SL
D now
at 0.00028 (tev33, comparable)
●L
HC
projected to be few x 10
-5 , more difficult
●C
P: com
plementary, m
odel dependent for interpretation●
only doable at tev33
●diboson couplings: tim
ely tev33 measurem
ents●
LE
PII, com
parable for D
kg (tev33 better for
lg )
●L
HC
better
●radiation zero: possibly unique tev33 m
easurement
●L
HC
hard...QC
D corrections difficult
millions of W
’s and Z’s are critical, high quality, high statistics system
atics toolsm
illions of W’s and Z
’s are critical, high quality, high statistics systematics tools
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000
Lig
ht H
igg
s Ph
ysicsL
igh
t Hig
gs P
hysics
U. H
eintz, F
ermilab
D. K
uh
lman
n, A
rgo
nn
eS
. Willen
bro
ck, Un
iversity of Illin
ois
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000lig
ht h
igg
s ph
ysics
bo
oks h
ave been
written
on
ho
w to
do
this...
●conventional w
isdom becam
e broader a few years ago w
ith the outlining of the potential for associated light H
iggs production
●if m
inimal supersym
metry is viable, then there w
ould be an expectation for a H
iggs spectrum w
hich included a light, SM-like
neutral scalar. Constraints w
ould suggest, mH < 125 G
eV/c
2
●the canonical
gg m
ode would be invisible to L
HC
in this range and backgrounds m
ight fatally comprom
ise associated production at LH
C
●this has becom
e an important com
ponent of a tev33 program
W
*W
lν
h b b
W*, Z
*
W,Z
q
h ττ
q
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000• quick sum
mary •
ligh
t hig
gs p
hysics at ferm
ilab m
ay be tim
ely and
u
niq
ue
●study has concluded that there is a lum
inosity threshold of 5-25 fb-1
for the detection of a light higgs in the range 60-120 GeV
/c2
fi W
H fi
bbln is the best m
ode for discovery●
depends on b-tagging and jet fitting, and W+ heavy flavor
backgrounds, just like the top program
●the qq
fi (W
,Z) H
fi
tt jj m
odes are very difficult●
qq fi
ZH
fi
nn bb m
ode has not bee investigated●
combined significance w
ith W m
ode might im
prove overall discovery pow
er
●interm
ediate mass H
iggs may be discoverable at L
HC
, but disconfirm
ation as SUSY
Higgs is com
promised due to uncertain
model-dependent B
R(H
fi
gg)
fi W
H is com
plementary to e
+e- fi
ZH
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000W
H fi
bb
on
ly a few p
eop
le seem to
kno
w h
ow
to d
o th
is!●
evolving study which has largely confirm
ed early theoretical calculations
●typical W
cuts/selection●
pT > 15 G
eV/c for both b jets; |y | < 2.0
●no extra jets w
ith pT > 30 G
eV/c
(or 2 extra jets above 15 GeV
/c)●
no extra leptons with p
T > 20 GeV
/c
●C
DF
calorimeter sim
ulation
double b tagging required
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000b
ackgro
un
ds an
d b
-tagg
ing
backg
rou
nd
s are the issu
e●
W + bb; W
Z (Z
fi
bb); W*
fi single top; gluon fusion single top, tt
●S/B
different among proponents - M
H dependent cuts provide x4 im
provement. T
his study assumed x2 im
provement, w
ithout optim
ized cuts.
●b-tagging based directly on C
DF
experience and measurem
ent●
strategy of trying to show convincing m
ass bump on optim
um
background shape●
double b-tagging, conservative
0
100
200
300
400
500
600
5060
7080
90100
110120
130
sign
al/backg
rou
nd
tev_2000 stud
y, full sim
ulatio
n, jet level
hig
gs
WZ
W+b
bttW
*tq
b
number of events10fb-1
mH
igg
s (GeV
/c2)
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000all b
ackgro
un
ds
tev33 has b
etter backg
rou
nd
con
trol
Tevatron
LH
C
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000resu
lts WH
fi
bb
the key w
ill be m
(jj ) resolu
tion
●three options studied:
“best”, “better”, “worst” ... like Sears.
mH
significance
10 fb -1
60 GeV/c 2
9 s
80 GeV/c 2
7 s
100 GeV/c 2
4.9 s
120 GeV/c 2
uncertain
“better”“best”
“better”
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000
m(ττ) (G
eV)
number of events
0 50
100
150
200
250
300
350
100105
110115
120125
130135
140
ZH
fi
tt jj
strategy h
ere is to co
mb
ine th
e low
er-statistics tau
chan
nel w
ith th
e bo
ttom
.●
backgrounds are totally different, maybe im
portant for highest m
ass range in WH
where top begins to becom
e serious and irreducible
●nonetheless, the background
from Z
fi
tt jj is huge
●strategy
●calculate m
(tt ) from
direction
and pT of the
tt system
in one-prongs●
DO
resolutions and rejection power
●in 10 fb
-1, yield is about 10 events w
ith S/B of 0.1
●resolution is obviously critical
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000L
EP
II, LH
C, N
LC
LE
PII
●by 1992,
Ös = 192 GeV
2 which w
ill reach to mH »
95 GeV
/c2
the en
tire mH ran
ge is accessib
le with
sign
ificant R
F an
d
cryo u
pg
rades...p
rob
ably in
con
flict with
LH
C.
LH
C●
gg m
ode still plated with gold, but associated production is
conceivable...but with very difficult top backgrounds
NL
C●
discovery is straightforward in the Z
H m
ode.
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000
Su
persym
metric P
hysics
Su
persym
metric P
hysics
K. D
e, Un
iversity of T
exas, Arlin
gto
nT
. Kam
on
, Texas A
& M
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000su
persym
metry
man
y peo
ple th
ink th
ey kno
w h
ow
to d
o th
is!●
SUSY
is a theory which has been “refined” over recent years into a
model ●
containing 32 new particles, in addition to the current particle
spectrum, w
ith masses w
hich must lie in the range 100 G
eV/c
2 - 1 T
eV/ c
2
●including 2 H
iggs doublets with 5 physical states one of w
hich is “light” (< ~130G
eV/ c
2 ) and SM-like (see previous discussion!).
●T
here are some versions of the m
odel which correlate m
any masses
which m
akes the theory Highly P
redictive and can be made to be
consistent with L
EP
results
Su
persym
metry can
no
t be ru
led o
ut b
y direct search
es at F
ermilab
. Ho
wever, p
rom
ising
mo
dels, co
up
led w
ith th
e L
igh
t Hig
gs o
pp
ortu
nities m
ake the T
evatron
a crucial,
timely to
ol.
●strategies for discovery include chargino pair production, gluino pair production, and stop pair production...
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000• quick sum
mary •
sup
ersymm
etric ph
ysics at fermilab
will b
e timely,
com
plem
entary, an
d p
ossib
ly un
iqu
e●
Within the M
inimal M
odel, charginos of masses up to 250 G
eV/c
2 can be discovered.
●gluinos of m
asses up to 300-400 GeV
/c2 can be discovered
●w
ith varying degrees of model-dependence
●stops can be detected up to m
asses of 180 GeV
/c2 .
●SU
SY searches at tev33 w
ill be complem
entary to those of LE
PII
and NL
C.
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000lig
htest ch
argin
o
diag
rams like:
●various attem
pts at modeling of this “trilepton signal” and the
relevant backgrounds have been made
●dom
inant backgrounds are DY
or Z dileptons w
ith a fluctuating hadronic show
er which fakes an electron
●other backgrounds such as W
Z, Z
Z, and tt can be controlled through
dilepton mass cuts and E
T cuts●
different background estimates have been reconciled in the study
W
lνll
χ±1
~
χ01
~
χ±1
~
W
W
χ01
~show
ing the characteristic signal of:• 3 leptons• E
T
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000
100200
300400
50040
5070
Lightest Chargino M
ass (GeV
)
10-5
10-4
10-3
10-2
10-1
100
101
102
103
Cross-section x BR x EFF (fb)
ABCD
200 pb
2 fb
25 fb-1
-1
-1
mo
del sp
ace...
instru
ctive has b
een th
e space o
f SU
SY
mo
dels
●these are 5
s “discovery lim
its” above a presumed total background of
about 0.6 fb.●
an attempt has been m
ade to evaluate the effect of multiple
interactions in degrading the signal (and background) detection efficiencies...this seem
s to decrease the mass lim
it by about 10 GeV
/c2
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000g
luin
o search
...the “trad
ition
al glu
ino
search”
●com
es from diagram
s such as:
●various attem
pts at modeling this signal and the dom
inant backgrounds have been m
ade●
largest background is W plus jets and Z
plus jets...which can be
reduced substantially by requiring ET (j1 ) + E
T (j2 ) + ET > 300 G
eV
χ01
~χ01
~q
g ~
q ~
g ~q ~
q qq
g
showing the characteristic signal of
• multiple jets
• ET
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000m
ore m
od
el space...
●these are 10
s lim
its above backgrounds which are of order 40 fb.
●w
ith a high cut on ET of 75 G
eV, the effect of m
ultiple interactions m
ay be small...no degradation of efficiencies has been applied.
●the effect of pileup in “creating” extra jets is assum
ed to be small.
g ~ Mass (G
eV)
σ × EFF (fb)
Background (fb)
200 pb-1
2 fb-1
25 fb-1
100150
200250
300350
4001 10 10
2
103
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000sto
ps
ligh
t top
squ
ark search
●R
oughly speaking, the range of m(stop) to ~m
(top) can be roughly covered in 10 fb
-1
●In addition, if m
(stop) < m(top), then the decay t
fi c c is
kinematically favored: 2 colinear jets plus E
T
●this search peaks in sensitivity in R
un II at just below m
(top)
W
l, q
χ01
~
W
±χ
1
~χ
01
~
±χ
1
~
b
t ~
bg
t ~
ν, q
l ν
Here there are tw
o possible strategies w
ith different signals:1) single-lepton channel• one lepton• E
T
• at least one tagged b2) dilepton channel• 2 leptons•E
T
•>1 jet
~01
~
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000L
EP
II, NL
C, L
HC
●m
aximum
reaches by all of the players:
LH
C does considerably better.
●T
he issue is not one of setting a limit, but in creating
1. a timely opportunity for discovery,
2. credible limits, and
3. a bank of experience which applies to future
experim
ents, should discovery not occur.
current
tev33
LEP II
NLC
maximum
mass limit
1fb-1
10fb-1
100fb -1
500pb -1,
190 GeV
20fb -1,
500 GeV
c ~–
1 GeV/c2
65
(LEP 140)
205
235
265
90
248
g ~ GeV/c 2
173
(DO/
, CDF)
350
400
>400
85
(100 pb-1
)» 250
t1 ~
GeV/c2
48
(LEP 140)
150
155
210
83
» 250
t1 ~
(fi
c)
GeV/c 2
100
(DO/
)150
150
150
na
» 250
The L
ight Higgs opportunity
˜
with the above direct SU
SY sensitivity
are a formidable assault on the m
ost promising supersym
metric m
odels.
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000
Exo
tic Ph
ysicsE
xotic P
hysics
R. H
arris, Ferm
ilab
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000exo
tics... • real quick summ
ary •
exotic search
es at fermilab
will b
e timely an
d
com
plem
entary to
oth
er facilities●
effectively a doublingof current capabilityin R
unII and a
superluminous
exposure
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000Ph
ysics with
a Po
larized P
roto
n B
eamP
hysics w
ith a P
olarized
Pro
ton
Beam
R. B
rock, M
ichig
an S
tate Un
iversityG
. Lad
insky, M
ichig
an S
tate Un
iversityH
. Weerts, M
ichig
an S
tate Un
iversity
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000p
olarized
beam
s... • real quick summ
ary •
po
larized co
llidin
g b
eam p
hysics at ferm
ilab w
ou
ld
clearly be u
niq
ue
●It m
ay be feasible to polarize the proton beam, transversely and
longitudinally at high luminosity. T
he $ cost is not unreasonable, but the question is on overall perform
ance.
●non-negligible im
provement of S/B
for certain measurem
ents m
ight be obtainable - esp. QC
D backgrounds
●T
here is a sizeable reduction in L
...hence, polarizing one beam
now is not com
pelling●
How
ever, this might not be the w
hole story
●physics opportunities should continue to be explored
●If it w
ere possible to polarize both the p and the p beams, w
ithout sizeable negative effects on lum
inosity, the S/B issues and distinct
EW
physics opportunities might arise.
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000
Detecto
r Req
uirem
ents
Detecto
r Req
uirem
ents
J. Wo
mersley, F
ermilab
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000d
etector issu
es
Th
e real qu
estion
s...are detecto
r/collab
oratio
n(s)
qu
estion
s.●
watch out. T
he technical problems are probably solvable.
●the fiscal, organizational, sociological, and political issues m
ay be m
uch harder!●
how m
any upgrades start out at one level and then evolve into som
ething much m
ore ambitious? this situation m
ay not tolerate that.●
there was no effort to consider the 1 detector or 2 detector or staged
detectors or any of the other obvious conflicts that result when a
calendar is mapped onto this project!
In m
ost in
stances th
is wo
rksho
p w
as a join
t CD
F/D
O effo
rt. T
his level o
f coo
peratio
n m
ay have to
con
tinu
e in o
rder to
ach
ieve the p
hysics g
oals
■ Ask yo
urselves: co
uld
the p
hysics b
e mo
re imp
ortan
t th
an eith
er CD
F o
r DO
? If yo
u h
aven’t alread
y, you
will fin
d
you
rself con
fron
ting
difficu
lt issues like th
is in d
iscussin
g
detecto
r up
grad
es for tev33! h
aving
said th
at, I’ll ign
ore it.
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000• quick sum
mary •
hig
h lu
min
osity w
ill be ch
alleng
ing
...no
t cripp
ling
●tracking and vertex tagging appear to be feasible based on current experience and sensible extrapolations in a variety of w
orldwide
scenarios●
efficiencies ª 50% and m
istag rates < 1% seem
reasonable
●existing calorim
eter resolutions and acceptance seems sufficient
●lepton isolation w
ill degrade in the high luminosity
environment...how
much?
●m
uon performance of existing detectors w
ill likely be sufficient●
increased backgrounds seem inevitable and that w
ill affect triggering
●early looks at triggering capabilities suggest a m
atch with the
physics menu. A
gain, multiple interactions m
ay surprise...
●offline processing w
ill likely be capable with som
e 21st century extrapolation
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000d
etector issu
es
Th
e detecto
r challen
ges are sig
nifican
t...solu
tion
s are co
nsisten
t with
an evo
lving
accelerator.
●calorim
eter●
EM
:isolated electrons |
h | < 2.5
fi hard w
ith pileup?soft electron b tagsisolated electron triggering p
T > 15-20 GeV
/c
resolution ~ 15%/ ÖE
adequate●
Had:
id & m
easure jetsm
issing ET
0.1x0.1 segmentation adequate
resolution ~ 70%/ ÖE
adequate
triggering on jets and missing E
T
●tracking
magnetic, 3D
tracking
SVX
n disp. vertices | h
| ~ 2 with C
DF
performance @
1033
●m
uonsid &
measure soft m
uon b tags
isolated m trigger, |
h | < 2.5, p
T > 15-20 GeV
/c
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000d
etector, co
nt.
A T
RIG
GE
R C
AS
E S
TU
DY
:●
Straw-m
an trigger system considered:
●three level system
(1: analog hardw
are; 2: DSP
’s; 3: software)
pre-determined bandw
idth ceilings - an exercise
●prim
itives: (isolated electrons; isolated m
uons; charged tracks; jets; m
issing ET
. ..displaced vertices?)
●pileup? studies suggest that M
ET
> 20 GeV
still okay with 9
minbias overlap
buffer L
1L
2L
3host/tape
buffer buffer
W/Z →
lv/ll
(WH)
8kHz
3.4kHz
28Hz
ME
T +jets (SUSY,
ZH)
1.3kHz
1.3kHz
30Hz
qq tt
(W/Z)H
15kHz
5.8kHz
38Hz
top→leptons
7.2kHz
4.0kHz
50Hz
TOTAL
23.5kHz
11.1kHz
145Hz
limit
50kHz
10-20kHz
100-200Hz
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000 everyon
e’s favorite:
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_20001 tt even
t
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000+ 9 m
in b
ias
we are not unaw
are of the difficulties
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000p
rimary co
nclu
sion
s of th
e wo
rksho
p
●F
ermilab w
ill be the Top Q
uark factory for a decade or more...as w
ith other unusual quarks, the beginning of m
any decades of work and
surprises. It is essential that this opportunity be realized.●
Speculation that there may be a “lum
inosity threshold” for the discovery of a light H
iggs scalar appears to be borne out... 5 - 25 fb-1 level. M
ore work is still required.
•a strategy for confirming and realizing this threshold
necessary. this workshop?
●A
Tevatron program
can either discover supersymm
etry, or severely constrain it. A
ctual discovery potential still requires more w
ork.
●H
igh luminosity conditions are still not adequately understood as they
effect detector performance. B
etter understanding, including a serious R
&D
program seem
s critical.●
The physics overall is tantalizing...sim
ply waiting for L
HC
is unwise.
Maxim
izing the physics return of the Tevatron is an effort w
hich ought to be vigorously pursued w
ith managem
ent, accelerator, and user participation.
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000w
here are th
ere som
e com
mo
n th
emes?
there seem
to m
e to b
e a few im
po
rtant co
rrelation
s ●
we ought to be as confident as possible that w
e understand them●
W plus heavy flavor - recurs in alm
ost all topics. efficiencies, rejection, geom
etrical acceptance, pattern recognition in b-detection m
ake or break much of this
●lepton acceptance and efficiency - not really em
phasized, but figures into m
any issues, not the least of which is the pdf uncertainty in M
W.
Are the detection efficiencies and the tracking and vertexing
capabilities of the upgraded detectors completely understood?
●Q
CD
uncertainties and jet scale issues. An all-out attack on this w
ill be required - everyone know
s that. How
ever, the degree to which one
physics topic scratches the back of another physics topic (horrible m
etaphor...) ought to be well understood.
●Is there substantive benefit to pp - induced global E
W fitting (M
W, G
W,
AF
B , AW
, MH , ...)? A
modest program
could be imagined w
hich parallels m
uch of the broader (highly correlated) LE
P global fitting...
●pileup. T
here is a nervous calm about the effects of overlapping
events in many of the topics. H
as this really been understood?
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000 sen
timen
ts of th
e edito
rs/org
anizo
rs:
thin
k of th
e ph
ysics them
es:T
op
and
electrow
eak ph
ysics, symm
etry breakin
g,
gen
eration
al mixin
g am
on
g q
uarks an
d lep
ton
s, CP
in s, b
, an
d t (?
) systems, sp
ectrosco
py an
d rare d
ecays in s, c, b
, an
d t system
s, had
ron
ic structu
re in h
igh
and
low
pT
regim
es, and
the Z
oo
.
from the collider to the fixed target area to the oscillation program
, this w
onderful facility can continue a vigorous and comprehensive
program, w
holly and efficiently within the scope of the U
S borders.
Th
e fermilab
com
plex is g
uaran
teed to
sig
nifican
tly imp
act each o
f these areas
Th
e fermilab
com
plex is g
uaran
teed to
sig
nifican
tly imp
act each o
f these areas
Chip Brock
tev_2000 Workshop
5/23/96 4:46 PM
tev_2000
We have outlined here a p
rogram of research specifically for the
Tevatron collider at F
ermilab. It is rich in guaranteed physics (top,
IVB
), surp
rising in
its reach to th
e next level (S
US
Y,
Higgs,
exotics), fertile in the different configurations which are feasible,
stimu
lating
to con
tinu
ed
R&
D
in accelerator
and detector
technologies, and stable as a platform for the far future of high
energy physics (ultra-high energy pp or pp, and e+e
- linear collider, or a µ
- collider). Much w
ork still remains to be done, but w
e hope that those w
ho have not considered the evolutionary opportunities at the F
ermilab com
plex will begin to look deeper w
ith us. We urge our
colleagues, the Ferm
ilab managem
ent, the Departm
ent of Energy, the
National S
cience Foundation, and m
embers of C
ongress to take seriously a P
hysics Program
for the United S
tates which builds on the
significant investment of m
illions of dollars and thousands of physicist-years to continue to F
ollow the P
hysics.