bsm higgs at lhc prospects end 2011 and before...ztautau zee zmumu wenu wmunu wtaunu single t t¯t...

BSM Higgs at LHC prospects end 2011 and before

Reisaburo TANAKA (LAL) On behalf of ATLAS and CMS Collaborations

Higgs Hunting Workshop July 29-31, 2010 @ LAL-Orsay

July 30, 2010 1 Higgs Hunting: BSM Higgs at LHC

1. Electroweak Symmetry Breaking Mechanism   Higgs as the origin of Electroweak Symmetry Breaking

  Weak gauge bosons and fermions are massive. ➭ Electroweak symmetry must be broken.

  Higgs Mechanism Original idea on spontaneous symmetry breaking by Y. Nambu (1960).

➭ Application to relativistic gauge theory by P. W. Higgs, F. Englert and R. Brout (1964).

… since then we are looking for Higgs particle …

  Only one Higgs doublet?   Fine tuning problem, naturalness … ➭ New physics may exist around electroweak

energy scale (accessible by LHC) !   Most popular benchmark scenario

➭ SUSY-MSSM: Smoking-gun signature in 1991 SUSY is still escaping from our detection.

  But there are many other models: like Extra-Dimension, Little Higgs, Composite Higgs or even Higgsless. ➭ Rich phenomenology.


W- W＋Z0γ

H-H0

H0H+

Gauge vector boson(spin=1)

Scalar particle(spin=0)

Photon

Ghost

Higgs particle

WeakBoson

10log Q

1/!i

1/!1

1/!2

1/!3

MSSM

10log Q

1/!i

0

10

20

30

40

50

60

0 5 10 15 0

10

20

30

40

50

60

0 5 10 15

U. Amaldi, W. de Boer, H. Furstenau, PL B260(1991)coupling constants of electromagnetic –, weak–, and strong interactions

due to radiative corrections (LO)

W. de Boer

G. 't Hooft, Scientific American 242 6 (1980) 104-138.

SUSY (m)SUGRA

GMSB AMSB Mirage

Split SUSY RPV, …

Extra-Dimension

LED(ADD) Randall-Sundrum Universal ED(KK)

…

Extended Gauge Symmetry Higgsless

Left-Right Symmetric Model, Gauge-Higgs Unification

Dynamical Symmetry Breaking Strong EWSB, Chiral Lagrangian, Technicolor

Top-quark Condensation Composite Higgs, Little Higgs

J.Lykken, Physics at LHC (Vienna)

Precision EW data

3 July 30, 2010

Poor experimentalist’s compilation of models. Perhaps “Not even wrong”!

Higgs Hunting: BSM Higgs at LHC

W !, Z !

Graviton, BH

Resonances

LHC earlydiscovery?

g/q, xMSSMHiggs

2. MSSM Higgs

July 30, 2010 Higgs Hunting: BSM Higgs at LHC 4

50 100 150 200 250 300

MA [GeV]

50

100

150

200

250

300

MH

igg

s [G

eV

]

tan! = 5

tan! = 40

mh

max: M

SUSY = 1 TeV, X

t = 2 Tev, A

t = A

b = A

", m

t = 171.4 GeV

! = M2 = 200 GeV, m

g~ = 800 GeV

FeynHiggs 2.5

Mh

MH

MH

±

S. Heinemeyer, http://www.ifca.es/users/heinemey/uni/plots/   MSSM Higgs (2HDM Type-II)   2x4-3=5 physical scalar fields: h/H/A and H±   Tree level: 2 free parameters:   CP-even h/H

  LO mass   SM-like in large mA   Enhanced coupling to down-type (b/τ) at large tanβ

  CP-odd A   No coupling to W and Z.   Decay predominantly to bb, ττ, tt.

  Mass degeneration at large tanβ (h/A, H/A)   Charged Higgs H±

  Decay predominantly to τν and tb.   LO mass relation (+ loop correction)

  Benchmark scenario ( most popular)

1 10

tan!

70

80

90

100

110

120

130

140

mh [

Ge

V] SM exclusion bound

mh

max

no mixing

mt = 172.5 ± 2.3 GeV

MA = 500 GeV

! = M2 = 200 GeV

FeynHiggs2.4

Scenario MSUSY XOSt µ M2 Mg Upper bound

(GeV) (GeV) (GeV) (GeV) (GeV) on mh (GeV)mmax

h 1000 2000 200 200 800 133no mixing 2000 0 200 200 800 116gluophobic 350 -750 300 300 500 119small !e! 800 -1100 2000 500 500 123

1

mmaxh scenario

M. Carena et al., E.P.J. C26 (2003) 601-607

mA(mH±), tan! =vu

vd

m2H± = m2

A + m2W

mh < mZ (mh > mZ due to radiative corr.)

BR(h)tg = 3

bb_

+

cc_

gg

WW

ZZ

Mh [GeV]

1BR(h)tg = 30

bb_

+

gg

WW

ZZgg

cc_

Z

Mh [GeV]

1

10 -3

10 -2

10 -1

60 80 100 120 14010 -3

10 -2

10 -1

60 80 100 120 140

BR(H)tg =3bb

_

ggcc_

+

bb (tg =30)_

+ (tg =30)

MH [GeV]100 200 300 500 1000

BR(H)tg =3

hh hh

WW

ZZ

tt-

ZA

MH [GeV]100 200 300 500 100010 -2

10 -1

10 -2

10 -1

100 150 200 250 300 350 400 450 500

M! [GeV]

100

101

102

103

104

105

106

107

! p

rod

uctio

n c

ross s

ectio

n [

fb]

HSM

h

H

A

LHC, "s = 7 TeV

mh

max, tan# = 40

(bb)!

gg!

FeynHiggs2.7.1

SM

gg!

bb!

BR(A)tg = 3

bb_

+

gg

Zhtt-

MA [GeV]50 100 200 500 1000

1BR(A)tg = 30

bb_

+

ggtt-

MA [GeV]50 100 200 500 1000

1

10 -3

10 -2

10 -1

10 -3

10 -2

10 -1

3. MSSM Neutral Higgs


S. Heinemeyer, W. Hollik and G. Weiglein, Comp. Phys. Comm. 124 (2000) 76.

  MSSM Neutral Higgs production

  MSSM Neutral Higgs decay

  is difficult. ATLAS Fast Tracker (FTK) LVL2 proposal for L=1033-34 cm-2s-1 era (>2012).

gg ! !, bg ! b!, gg ! bb!(! = h, H,A)

100 150 200 250 300 350 400 450 500

M! [GeV]

100

101

102

103

104

105

! p

rod

uctio

n c

ross s

ectio

n [

fb]

HSM

h

H

A

LHC, "s = 7 TeV

mh

max, tan# = 5

(bb)!

gg!

FeynHiggs2.7.1

SM gg!

bb!

M. Gomez-Bock et al., arXiv:0712.2419

!! bb

!! !+!! ! "", "h, hh + #"s

h

A

H

tanβ=3 tanβ=30

!

  Event selection

  Main backgrounds:   Higgs mass resolution

July 30, 2010 6

Z/!!(+jets), tt,W+jets,QCD multi! jets

[GeV]!!m0 50 100 150 200 250 300

Arb

itra

ry U

nits

0

(130 GeV)!!"H

Gaussian fit

= 24.6 GeV#

= 119.4 GeV!

ATLAS

H ! !! ! e!jet3"

!M

M! 20%


H ! !! ! 2"4#

gg!/bb!,!(h/H/A)! !+!!

difficult…

CMS NOTE 2006/075 ATLAS arXiv:0901.0512

2!4" !#jet3" 2#jet2"Trigger single- or di-lepton single-lep. or lepton+#jet single- or di-#jet

Higgs Decay 2 isolated leptons 1 isol. lepton + 1 #jet 2 #jet

b-tagging ATLAS: ! 0 b-jet. CMS: = 1 b-jet.(against Z/$!) (Not exactly two b-jets, due to the soft pb

T -spectrum from the signal.)Central jet-veto ATLAS: Not more than two jets (including the b-tagging jets).(against tt) CMS: No additional jets in the central region (except b- and # -jets).Transverse mass

mT =!

2p!T Emiss

T

"cos( %p!

T , %EmissT )

#, key is %Emiss

T measurement(against W+jets)Higgs mass Collinear approximation: # decay products emitted in # -directionreconstruction No back-to-back decays, momentum fractions of "’s should be positive.

1

!M

M! 20%

Collinear Approximation

m!+!! =m"","h!

x1x2

works except ! "= 0,"

]2 [GeV/c m0 200 400 600 800 1000

]2/ 2

0 [Ge

V/c

-1Ev

ents

for 2

0 fb

0

10

20

30

40

50

60

70 Background parametrisation)=20,Signal+Bkg. for tan(

2=200 GeV/cAm)=30,Signal+Bkg. for tan(

2=500 GeV/cAm


ATL-PHYS-PUB-2010-011


[GeV]!!m0 200 400 600 800 1000 1200

Cro

ss S

ectio

n (

fb /

20

Ge

V)

0

20

40

60

80

100

120

[GeV]!!m0 200 400 600 800 1000 1200

Cro

ss S

ectio

n (

fb /

20

Ge

V)

0

20

40

60

80

100

120!!"H!!"Z

ll"Z

W

ttQCD

= 200 GeVAm = 14#tan

100 150 200 250 300 350 400 4500

2

4

6

8

10

12

14

16

18

20

22

100 150 200 250 300 350 400 4500

2

4

6

8

10

12

14

16

18

20

22

ATLASPreliminary(Simulation)

[GeV]!!m0 200 400 600 800 1000 1200

Cro

ss S

ectio

n (

fb /

80

Ge

V)

0

2

4

6

8

10

12

14

16

[GeV]!!m0 200 400 600 800 1000 1200

Cro

ss S

ectio

n (

fb /

80

Ge

V)

0

2

4

6

8

10

12

14

16

!!"H

!!"Z

ll"Z

W

ttQCD

= 200 GeVAm = 14#tan

ATLASPreliminary(Simulation)

gg!/bb!,!(h/H/A)! !+!!

CMS NOTE 2006/075,101,105

H/A! !+!! ! eµ + X H/A! !+!! ! e!jet + X H/A! !+!! ! µ!jet + X

0 b-tagged ≥ 1 b-tagged

H/A! !+!! ! "!jet + X (" = e, µ)

H/A! !+!! invariant mass reconstruction √s=14TeV, ∫Ldt=30fb-1

√s=14TeV, ∫Ldt=20-30fb-1

tt

ZW

H

[GeV]!!m0 200 400 600 800 1000 1200

No

rma

lise

d t

o u

nit a

rea

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0.16

0.18

0.2

Control Region

ATLAS Preliminary(Simulation)

Signal Region

[GeV]eE

0 20 40 60 80 100 120 140 160

[G

eV

]

!E

0

20

40

60

80

100

120

140

160



, e channel [GeV]!!m

80 100 120 140 160 180 200 220 240

Cro

ss S

ecti

on

(fb

/ 6

.7 G

eV

)

0

50

100

150

200

250

!!"Z

ll rescaled"Z


gg!/bb!,!(h/H/A)! !+!!


[GeV]Tm0 20 40 60 80 100 120 140 160 180 200

Cro

ss S

ection (

fb / 2

GeV

)

1

10

210

310

[GeV]Tm0 20 40 60 80 100 120 140 160 180 200

Cro

ss S

ection (

fb / 2

GeV

)

1

10

210

310

Signal

QCD

!!"Zll"Z

tt


W+jets

EmissT > 100 GeV

√s=14TeV, ∫Ldt=30fb-1

W

signal control

Jet Multiplicity

0 1 2 3 4 5 6 7 8 9

Num

ber

of events

per

bin

0

20

40

60

80

100

120

140

160

Jet Multiplicity

0 1 2 3 4 5 6 7 8 9

Num

ber

of events

per

bin

0

20

40

60

80

100

120

140

160 ttbar

Ztautau

Zee

Zmumu

Wenu

Wmunu

Wtaunu

Single top

bbJ1-J6

bbA300

Control region

=15!tan

=300 GeVAm


tt

tt

0 1 2 3 4 5 6 7 8 90

50

100

150

200

250

Jet Multiplicity

0 1 2 3 4 5 6 7 8 9

Num

ber

of events

per

bin

0

50

100

150

200

250


=45!tan

=300 GeVAm

ttbar

bbA/H300Ztautau

Zee

ZmumuWenu

Wmunu

WtaunuSingle t

tt

Nnjets=1,2tt, signal region = Nnjets=1,2

tt, control region ·Nnjets>3

tt, signal region

Nnjets>3tt, control region

Z ! !+!!

Z ! !+!!

July 30, 2010 9

(GeV)A

m

120 140 160 180 200

for

95%

C.L

. exclu

sio

n!

tan

0

10

20

30

40

50

60

0 b-jets, no uncertainties

0 b-jets, with uncertainties

-!+! "h/H/A

-1 = 7 TeV, L=1 fbspp:

-scenario maxh

m


(GeV)A

m

120 140 160 180 200

for

95%

C.L

. exclu

sio

n!

tan

0

10

20

30

40

50

60

>0 b-jets, no uncertainties

>0 b-jets, with uncertainties

-!+! "h/H/A

-1 = 7 TeV, L=1 fbspp:

-scenario maxh

m



bb(h/H/A),!! µ+µ!


ATLAS arXiv:0901.0512

Mean 4±Sigma 4.8e!03± 6.3

(GeV)!+m100 150 200 250 300 350 400

Entri

es

0100200300400500600700800900 ATLAS

Mean 4e!03± 199.6 Sigma ±

bbA !> = 200 GeVAm

) = 30!tan(

μμ

μμ

  Branching ratio is small,

  But very clean signature with muons, excellent mass resolution ~ 3% (20% for ττ), allows precise mass measurement once discovered.

  Analysis   0 b-jets (ATLAS) or ≥ 1 b-jet (ATLAS and CMS) against Z,   2 isolated muons of opposite charge,   Missing ET and jet veto cuts against tt.

!M

M! 3%

Br(!! µ+µ!) " Br(!! !+!!)/300

√s=7TeV, ∫Ldt=1fb-1 √s=7TeV, ∫Ldt=1fb-1

]2 [GeV/cA m

100 200 300 400 500

! tan

10

20

30

40

50

60

70

80

=+200 GeV! max, hm

]e"!", had"e", had"!" ["" # $, $bb

95% CL exclusion: mean95% CL exclusion: 68% band95% CL exclusion: 95% band

discovery%5

-1CMS Preliminary: projection for 7 TeV, 1 fb Mar 22 2010

Excluded by LEP

Excluded by Tevatron

)-1(Run II, 1.8-2.2 fb   Projection for discovery and exclusion potential at √s=7TeV, ∫Ldt=1fb-1.


[GeV]Am100 200 300 400 500 600 700 800

!ta

n

67

10

20

30

40

50

lep/had Discovery Limit

lep/had Theoretical Uncertainty

lep/had Uncorrelated Systematics

lep/had No Systematics

lep/lep Discovery Limit

) Uncertaintyt(t"lep/lep +10%

Discovery"5

scenariomaxhm

-1=14 TeV, L=30fbs


2,GeV/cAM100 200 300 400 500 600 700 800

!tan

10

20

30

40

50

-1CMS, 30 fb

= h,H,A", " bb#pp

scenariomaxh

m

2 = 1 TeV/c

SUSYM

2 = 200 GeV/c2M

2 = 200 GeV/cµ

2 = 800 GeV/c

gluinom

SUSY = 2 M

tStop mix: X

µ e

# $$ #

"

+jet

µ # $$

# "

e+jet# $$ # "

-1

jet+jet, 6

0 fb

# $$ # "

µµ

# "

ATL-PHYS-PUB-2010-011 CMS CERN-LHCC-2006-021

CMS NOTE 2010/008

gg!/bb!,!(h/H/A)! !+!!

5 σ Discovery


√s=14TeV, ∫Ldt=30fb-1 √s=14TeV, ∫Ldt=30fb-1

0 b-tag + ≥ 1 b-tag

discovery exclusion

4. MSSM Charged Higgs   Charged Higgs H±

  Observation is the direct sign of physics BSM   Light H±: t→bH+ in tt (H±→τν, cs)

  Early discovery possible.

  Heavy H±: gg/gb→t[b]H± (H±→tb,τν)

  Difficult at early LHC.


BR(H±)tg! = 3

"#

Wh

WA cb

cs

µ#

tb

MH± [GeV]

100 200 300 500

1

BR(H±)tg! = 30

"#

cs

cb

µ#

tb

MH± [GeV]

100 200 300 500

1

10-3

10-2

10-1

102

10-3

10-2

10-1

102

M. Gomez-Bock et al., arXiv:0712.2419

2,GeV/cAM100 200 300 400 500 600

!tan

10

20

30

40

50

60

70

80-1

CMS, 30 fb

""# $ ±

, H±

tbH$pp 2

= 175 GeV/ctm

scenariomaxh

m

2 = 1 TeV/c

SUSYM

2 = 200 GeV/c2M

2 = 200 GeV/cµ

2 = 800 GeV/c

gluinom

SUSY = 2 M

tStop mix: X

jjb$ Wb $t

bl" l$ Wb $t

!"#$%&'()

*+,!

-"$./0123'45$0',0/*/3/*5

ATLAS61',+4/2$7

89 ::9 :;9 :-9 :<9 =99 =-9 >99 ?99

-

:9

:-

=9

=-

;9

;-

>9

>-

-9

--

?9

;9$@A!:

:9$@A!:

:$@A!:

BCD$EF,$GGHI1JF.'.8-K$BL

mmaxh scenario

√s=14TeV

MSSM Charged Higgs search   Light charged Higgs

  mode highest discovery reach.   New ATLAS study in at 7 TeV.

  Heavy charged Higgs   Limited sensitivity

  Sensitive to the systematic uncertainties.

Charged Higgs Analysis Channels


Light Charged Higgs: tt ! (H±b)(W!b)

W!b

W! ! !" W! ! qq"

H±b ! #±"b#! ! !""

(!"""b)(!"b) (!"""b)(jjb)ATLAS ATLAS

#! ! #had"(#had""b)(!"b) (#had""b)(jjb)

ATLAS and CMS ATLAS

H±b ! csb(jjb)(!"b) (jjb)(jjb)

ATLAS -Heavy Charged Higgs: gg, gb ! H±t[b]

t ! Wb

W ! !" W ! qq"

H± ! #±" #! ! #had"(#had"")(!"b) (#had"")(jjb)

- ATLAS and CMS

H± ! tb t ! qq"b(jjbb)(!"b) (jjbb)(jjb)

ATLAS and CMS -

1

H± ! !had""

H± ! !""" and cs

CMS CERN-LHCC-2006-021

ATLAS arXiv:0901.0512 √s=14TeV, ∫Ldt=1-30fb-1

√s=14TeV, ∫Ldt=30fb-1 H±

Di-jet mass [GeV]0 50 100 150 200 250

Fra

ction / 3

.6 G

eV

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

H+ (130 GeV)

SM W

ATLAS Preliminary (Simulation)

(After fitting)

=10 TeVs

Light Charged Higgs   Event selection

  Main backgrounds:


MH± < Mtop

tt, single top,Wbb/Zbb+jets,W/Z+jets,QCD multi! jets

Di-jet mass [GeV]0 50 100 150 200 250 300 350 400 450 500

Fra

ction / 7

.1 G

eV

0

0.02

0.04

0.06

0.08

0.1

H+ (130 GeV)

SM W


(Before fitting)

=10 TeVs

Di-jet Mass Fitter Jets

Unclustered Energy

Mtop constraint

MW constraint

tt ! (H±b)(Wb)Final state Semi-leptonic tt, H+ ! cs Di-lepton tt, H+ ! !+"

(cs b)(#" b) ! (jj b)(#" b) (!" b)(#" b) ! (#""" b)(#" b)Trigger single-lepton single-leptonO!ine missing transverse energy 2 oppositely charged leptons

" 4 jets " 2 jetsb-tagging 2 b-jets among leading 4 jets 2 b-jets" reconstruction $p!

T = $EmissT

! $p!T = $Emiss

TMW constraint via pL(") = f (pT ("), p")

Kinematical 4-fold ambiguity with 2 b-tagged jets 4-fold ambiguityambiguity (2 for ", 2 for jj) (2#, 2b-jets assignment)Kinematics di-jet mass fitter helicity angle cos %!"W and top reconst. generalized transverse mass mH+

T2Systematic jet energy resolution, b-jet energy scale, jet energy scale,errors (pile-up events) b-tagging fake rate and e"ciency

1

tt! (H+b)(Wb)! (csb)(!"b)

!2 =!

i=!,4jets

(pi,fitT ! pi,meas

T )2

"2i

+!

j=x,y

(pUE,fitj ! pUE,meas

j )2

"2UE

+!

k=jjb,b!"

(Mk !Mtop)2

"2top

+(M!" !MW )2

"2W

ATL-PHYS-PUB-2010-006/009

√s=10TeV, ∫Ldt=200pb-1

W W

H+ ! cs H+ ! cs

Helicity Angle   SM top-quark decay:

  Distortion in H+ distribution:

- H+ is scalar (isotropic decay) - MH+ and MW are different, τ leptonic decay (ν’s) ➭ H+ signal peaked at -1. Caveat: can measure in lab-frame:

Generalized Transverse Mass   Event-by-event determination of the lower limit for

mass of the Higgs boson   8 variables and 6 constraining equations.   represents unknown quantities.   Assign to be one of unconstrained d.o.f.

  Maximize H+ mass using Lagrange multipliers


1N

dN(W ! !"!)d cos #!!

=34

m2t

!1" cos2 #!!

"+ m2

W (1" cos #!! )2

m2t + 2M2

W

!"#"$%&'!()$!* !+,- !+,. !+,/ !+,0 + +,0 +,/ +,. +,- *

1234%'$"5"+,/

+

0++

/++

.++

-++

*+++

*0++

*/++

*.++

!"#"$%&'!()$!* !+,- !+,. !+,/ !+,0 + +,0 +,/ +,. +,- *

1234%'$"5"+,/

+

0++

/++

.++

-++

*+++

*0++

*/++

*.++ATLAS 64'7%8%294:

;<%8=793%)2>

"?"@"A'BC$ *"DE!*

>"?"*F+"G'BH

8;#

"#"$H

#

<%I297

33<%2I7'!3)J

"77$K""7$L

cos !!! !4pb · p!

m2t "m2

W

" 1

cos !!!

top b

!

!

W

!! Angle of lepton w.r.t. helicity axis

t!Wb! !"

t! H+b

D. Eriksson et al.,JHEP 01 (2008) 024

pH+and p!!

!pHz

mH+

T2

E. Gross and O. Vitells, PRD 81 (2010) 055010

(pH++ pb)2 = m2

top

(p!! + p"! + pb)2 = m2top

(p!! + p"!)2 = m2W

(p"!)2 = 0

(!pH+

T ! !p !+

T ) + !p "!T = !pmiss

T

Mtop constraint Mtop constraint MW constraint ν mass ν missing ET

tt! (H+b)(W!b)! (!+"!"""" b)(!!"!b)

mH+

T2 = max!p H+

T

!MH

T (!pH+

T )",

with#MH

T

$2=

%&m2

top + (!pH+

T + !p bT )2 ! pb

T

'2

!(pH+

T

)2.

Generalized transverse mass [GeV]

0 20 40 60 80 100 120 140 160 180

Num

ber

of events

0

100

200

300

400

500

600

b) = 17%+

H!BR(t

b) = 0% (SM)+

H!BR(t

) = 130 GeV+


m(H

= 10 TeVs

ATL-PHYS-PUB-2010-006/009

√s=10TeV ∫Ldt=200pb-1

√s=7TeV ∫Ldt=1fb-1

tt SM

B(t! bH+) = 17 %H+ ! !"

90 100 110 120 130 140 1500

0.05

0.1

0.15

0.2

0.25

0.3

0.35

Mass [GeV]+

H

) =

1!"

#+b)

with B

(H+

H#

B(t

Expected at 95% CL (stat. only)

data-1Tevatron limits with 1.0 fb

Expected at 95% CL (stat+syst)

68% of SM at 95% CL

95% of SM at 95% CL

ATLAS Preliminary (Simulation)-1

=7 TeV, 1 fbs

90 100 110 120 130 140 1500

0.05

0.1

0.15

0.2

0.25

Mass [GeV]+

H

) =

1s

c!+

b)

with

B(H

+ H

!B

(t

Expected at 95% CL (stat. only)

Expected at 95% CL (stat+syst)

68% of SM at 95% CL

95% of SM at 95% CL

data-1

Tevatron limits with 2.2 fb

ATLAS Preliminary

(Simulation)

=7 TeVs-1

1 fb

Light Charged Higgs tt! (H+b)(W!b)


MH± < Mtop


Di! lepton tt, H+ " !+"

tt" (H+b)(W!b)" (!+b)(#!"b)" (#+"""b)(#!"b)Semi! leptonic tt, H+ " cs

tt" (H+b)(W!b)" (csb)(!!"b)


Tevatron Tevatron

LHC LHC

]2 [GeV/cH

Higgs mass, m

200 400 600

SM

!/95%

CL

! r

=

1

10]!, 2e2! ZZ [4e, 4"H

95% CL exclusion: mean95% CL exclusion: 68% band95% CL exclusion: 95% band95% CL exclusion: mean (no sys)


SM

SM+4G

5. Beyond MSSM Higgs: 4th Generation   Sequential 4th generation of fermions

Main constraints:   Invisible Z width at LEP-I: Mν4>50 GeV   Direct searches at Tevatron: Mu4>256 GeV   Generational mixing, EW oblique parameters   LEP2 bounds for unstable ν4 : Mν4>100 GeV

  4th generation of quarks (extra doublet)   Higgs production cross sections:

Additional quarks enhance by x3 ggH coupling, ggH enhanced by ~x9! (regardless of how massive the two extra quarks might be.)

VH and VBF remain at SM rate.   Higgs decay BRs:

Hgg significantly increased at low mass. HWW/ZZ dominant mode for mH>135 GeV.

July 30, 2010 16

G.D. Kribs et al., PRD 76 (2007) 075016

N. Becerici Schmidt et al., Eur. Phys. J. C66 (2010) 119


Current Tevatron limit (arXiv:1005.3216)

131<Mhiggs<204 GeV/c2 excluded at 95% C.L..

MHiggs < 400 GeV/c2 can be excluded at early LHC.

(GeV)Higgsm200 300 400 500 600 700 800 1000

Enha

ncem

ent F

acto

r

4

10

20=350GeV

4d=250GeV m4um

=325GeV4d=275GeV m

4um=300GeV

4d=300GeV m4um

!=4d=m

4um

200 300 400 500100

MH [GeV]

0.0001

0.001

0.01

0.1

1

Bran

ching

Rat

io BR

(H)

!!

Z!

ss"+"#

Z*Z*

W*W*

l4l4 t*t*

gg

bb

$+$#

cc

%4%4

CMS NOTE 2010/008 √s=7TeV, ∫Ldt=1fb-1

Fermiophobic Higgs

]2 [GeV/cH

Higgs mass, m

100 120 140 160

SM

!/95

%C

L!

r =

0

2

4

6

8

10

12

14 [no photon categories]"" #H

95% CL exclusion: mean95% CL exclusion: 68% band95% CL exclusion: 95% band95% CL exclusion: mean (no sys)


  Fermiophobic over SM Higgs   Higgs couples only to bosons   Lose a factor of 10 in cross section   Gain a large factor in Br(H→γγ)   σ x BR is larger than that of SM up to 130GeV   Current Tevatron exclusion mH< 106GeVc2 (ICHEP2010)

  If we do nothing special for fermiophobic Higgs at LHC –  r~4 for SM Higgs implies that we can exclude fermiophobic

MHiggs < 110 GeV/c2 can be excluded at early LHC.


CMS NOTE 2010/008 √s=7TeV, ∫Ldt=1fb-1

)2M (TeV/c0.8 1 1.2 1.4 1.6 1.8 2 2.2

)-1

Inte

gra

ted

lu

min

osit

y (

pb

210

310

410

510

CMS preliminary

discovery!5

SSM Z’

"Z’

RS grav. (0.1)

RS grav. (0.05)

PAS EXO-09-006 scaled to 7 TeV

)2M (TeV/c0.8 1 1.2 1.4 1.6 1.8 2 2.2

)-1

Inte

gra

ted

lu

min

osit

y (

pb

210

310

410

510

  RS gravitons and Z′

  Vector boson scattering at high mass

A/H

!!02

"+

"! "!

!!01

!!02

"+

"!

"!

!!01

  SUSY cascade decay

  Other SUSY scenarios, NMSSM etc.   Invisible Higgs decay   Radions in 5D Randall-Sundrum model

  Littlest Higgs model

[GeV]Am350 400 450 500 550 600 650 700 750 800 850

!ta

n

0

5

10

15

20

25

30

35

40

45

50Set2

-1L = 300 fb

= 5B

S

ATLAS

Other scenarios for BSM Higgs


Parton luminosities http://projects.hepforge.org/mstwpdf/

102

103

0.0

0.2

0.4

0.6

0.8

1.0

10/14

!qq

gg

7/14

ratios of parton luminosities

at 7 TeV, 10 TeV and 14 TeV LHC

lum

ino

sity r

atio

MX (GeV)

MSTW2008NLO


1

1.5

2

2.5

3

3.5

4

-2 -1.5 -1 -0.5 0 0.5 1 1.5 2!

"#,

TeV

CMS, 30 fb-1. 5$ discovery contour

#!hh!2%+2b, m#=300 GeV/c2, mh=125 GeV/c2

th. excluded

th. excluded

!! hh! ""bb, ##bbmixing parameter !

radion field vev !!

]2 [TeV/c± ±!m

0.3 0.4 0.5 0.6 0.7 0.8 0.9

sC

L

-710

-610

-510

-410

-310

-210

-110

1

]2 [TeV/c± ±!m

0.3 0.4 0.5 0.6 0.7 0.8 0.9

sC

L

-710

-610

-510

-410

-310

-210

-110

1

-1 = 10 fbintL

Signal+

Background

Expected forBackground

only

band" 1± band" 2± expected limit

with 95% CL.:

760 GeV

]2 [TeV/c± ±!m

0.3 0.4 0.5 0.6 0.7 0.8 0.9

sC

L

-710

-610

-510

-410

-310

-210

-110

1

!±±

H++H!! ! 4µ


M(Z’) [GeV]1000 1100 1200 1300 1400 1500

]-1Lu

mino

sity [

pb

210

310

)! ee (5"Z’)! (5##"Z’

ee (10 events)"Z’ (10 events)##"Z’

= 7 TeVsATLAS Preliminary

Simulation


√s=14TeV

√s=14TeV

√s=14TeV

√s=7TeV √s=7TeV

(GeV)WW

m0 200 400 600 800 1000 1200 1400 1600 1800 2000

-1e

ve

nts

/ 1

fb

-210

-110

1

10ATLAS

500 GeV scalar

800 GeV vector

1.1 TeV vector

non-resonant

√s=14TeV



6. Summary and Outlook   Rich BSM Higgs physics ahead of us at early LHC !

  First search for light non-SM Higgs(es) at √s=7TeV and ∫Ldt=1fb-1.   MSSM Φ=h/H/A in ggΦ/bbΦ (Φ→ττ)

  Discovery down to tanβ~20, exclusion down to tanβ~15 at low mA.   MSSM Charged Higgs in

  Limit on the branching ratio for Br(t→H+b) < 5% for low mH+.   Number of opportunities beyond SM and MSSM scenarios.

  But the analyses are complex. We have to understand W, Z, τ, b and top.   Need to find/understand particles from A, a to Z !

  Experimental issue: data-driven method to estimate the backgrounds.   Theoretical issue: MSSM 4-FS&5-FS calc., bbΦ NLO MC, b-quark pT etc.

One day we may be able to use Higgs(es) to probe the EWSB mechanism !


Young Scientist Forum: SM/MSSM H→ττ by K. Leney (Liverpool) and L. Bianchini (LLR Palaiseau)

Many thanks to: S. Heinemeyer, M. Spira, K. Tobe, A. Korytov, V. Sharma, K. Assamagan, S. Horvat, B. Murray and M. Schumacher

t! H+b in tt (H± ! !", cs)

Celui qui vient à la Lumière 2HDM (Type-II)!

弥勒下生告知

Theorists: “Zero Higgs is even beIer for my future papers…”

Experimentalists: “Let us concentrate on data analyses.”


Only 1HD!

Leonardo di ser Piero DA VINCI, dit Léonard de Vinci - Vinci, 1452 - Amboise, 1519 Saint Jean-Baptiste © Musée du Louvre

Mokuan 1333~1343 Hoteizu

MOA Museum of Art, Japan

Backup Backups


References

  ATLAS https://twiki.cern.ch/twiki/bin/view/Atlas/HiggsPublicResults   ATLAS sensitivity prospects for Higgs boson production at the LHC running at 7TeV (ATL-PHYS-PUB-2010-009)   Discovery potential of A/H→τ+τ-→lh in ATLAS (ATL-PHYS-PUB-2010-011)   Expected sensitivity in light charged Higgs boson searches for H+→τ+ν and H+→cs with early LHC data at the

ATLAS experiment (ATL-PHYS-PUB-2010-006)   Expected Performance of the ATLAS Experiment, Detector, Trigger and Physics ("CSC book")

(CERN-OPEN-2008-020, arXiv:0901.0512)

  CMS https://twiki.cern.ch/twiki/bin/view/CMSPublic/PhysicsResults   The CMS physics reach for searches at 7TeV (CMS NOTE 2010/008)   Search for MSSM heavy neutral Higgs boson in τ+τ→µ+jet decay mode (CMS NOTE 2006/105)   Search for the heavy neutral MSSM Higgs bosons with the H/A→ττ→electron+jet decay mode (CMS NOTE

2006/075)   Study of MSSM H/A→ττ→eµ+X in CMS (CMS NOTE 2006/101)   CMS Physics TDR, Volume II (CERN-LHCC-2006-021)

  LHC Higgs Cross Section Working Group https://twiki.cern.ch/twiki/bin/view/LHCPhysics/CrossSections


LHC Energy and Luminosity   Integrated luminosity of ≥1fb-1 by the end of 2011

  requires a peak luminosity of ≥ 1x1032 cm-2s-1 during 2011 → must reach ~1 x1032 cm-2s-1 during 2010

23

S. Meyers, ICHEP2010

Ecm=7→13→14TeV Year

∫Ldt (O

‐1)

mA [GeV] tan! Nbb Ngg Nbkg "NsysB S (without "N

sysB ) S (with "N

sysB )

150 14 5.2 0.16 12 1.0 7.8 4.3

200 14 5.0 0.062 11 1.1 7.7 3.9

300 17 2.4 0.019 6.5 0.71 4.8 2.7

450 27 0.99 0.0043 0.53 0.17 5.9 3.7

600 31 0.59 0 0.25 0.035 5.0 4.5

800 45 0.35 0 0.093 0.011 4.4 4.3

mA [GeV] tan! Nbb Ngg Nbkg "NsysB S (without "N

sysB ) S (with "N

sysB )

150 14 14 13 99 5.1 14 4.9

200 14 12 5.4 79 2.9 10 5.0

300 17 3.8 0.82 13 0.56 6.5 5.0

450 27 1.8 0.36 4.8 0.23 5.1 4.4

600 31 1.0 0 2.5 0.14 3.3 3.0

800 45 0.7 0 1.3 0.067 3.1 2.9


gg!/bb!,!(h/H/A)! !+!!

[GeV]!

TTransverse Momentum p

0 50 100 150 200 250

Cro

ss S

ectio

n (

fb/1

0G

eV

)

0

5

10

15

20

25

[GeV]!


0 50 100 150 200 250

Cro

ss S

ectio

n (

fb/1

0G

eV

)

0

5

10

15

20

25

=15"=300GeV, tan A

signal, m

signal, arbitrary scale

+ jets !! #Z

ll + jets#Z

W + jets

ttbar

qcd


#

Missing Transverse Energy [GeV]

0 20 40 60 80 100 120

Cro

ss S

ectio

n (

fb/5

Ge

V)

0

2

4

6

8

10

12

14

16

18


0 20 40 60 80 100 120

Cro

ss S

ectio

n (

fb/5

Ge

V)

0

2

4

6

8

10

12

14

16

18 =15!=300GeV, tan A

signal, m


+ jets "" #Z

ll + jets#Z

W + jets

ttbar

qcd


#

[rad]!"

0 0.5 1 1.5 2 2.5 3

Cro

ss S

ection (

fb)

0

5

10

15

20

25

30

[rad]!"

0 0.5 1 1.5 2 2.5 3

Cro

ss S

ection (

fb)

0

5

10

15

20

25

30 =15#=300GeV, tan A

signal, m


+ jets $$ %Z

ll + jets%Z

W + jets

ttbar

qcd


&%

[GeV]!


0 50 100 150 200 250

Cro

ss S

ectio

n (

fb/1

0G

eV

)

0

50

100

150

200

250

[GeV]!


0 50 100 150 200 250

Cro

ss S

ectio

n (

fb/1

0G

eV

)

0

50

100

150

200

250

=15"=300GeV, tan A

signal, m


+ jets !! #Z

ll + jets#Z

W + jets

ttbar

qcd


#


0 20 40 60 80 100 120

Cro

ss S

ectio

n (

fb/5

Ge

V)

0

50

100

150

200

250


0 20 40 60 80 100 120

Cro

ss S

ectio

n (

fb/5

Ge

V)

0

50

100

150

200

250 =15!=300GeV, tan A

signal, m


+ jets "" #Z

ll + jets#Z

W + jets

ttbar

qcd


#

[rad]!"

0 0.5 1 1.5 2 2.5 3

Cro

ss S

ection (

fb)

0

100

200

300

400

500

[rad]!"

0 0.5 1 1.5 2 2.5 3

Cro

ss S

ection (

fb)

0

100

200

300

400

500=15#=300GeV, tan

Asignal, m


+ jets $$ %Z

ll + jets%Z

W + jets

ttbar

qcd


&

ATL-PHYS-PUB-2010-011 Non b-tagged

b-tagged

b‐tagged

Non b‐tagged


Helicity angle in top decay   SM top-quark decay: t→Wb   Distortion in H+ distribution: t→H+b

- H+ is scalar (isotropic decay) - but MH+ and MW are different, τ leptonic decay (ν’s) - H+ signal peaked at -1. - Caveat: can measure in lab. Frame

)l!(

*cos

-1 -0.5 0 0.5 1

No

rma

lize

d n

um

be

r o

f e

ve

nts

0

0.05

0.1

0.15

0.2

0.25

0.3

l" l + #W

’s" l + # $" + $ #W

’s" l + # $" + $ # +

H

) = 130 GeV+


m(H

= 10 TeVs


1N

dN(W ! !"!)d cos #!!

=34

m2t

!1" cos2 #!!

"+ m2

W (1" cos #!! )2

m2t + 2M2

Wcos !!! !

4pb · p!

m2t "m2

W

" 1

top b

!

!

W

!! Angle of lepton w.r.t. helicity axis

)l!(

*cos

-1 -0.5 0 0.5 1

Nu

mb

er

of

eve

nts

0

200

400

600

800

1000

1200

b) = 17%+

H"BR(t

b) = 0% (SM)+

H"BR(t

) = 130 GeV+


m(H

= 10 TeVs


√s=10TeV, ∫Ldt=200pb-1

h/H/A Sensitivity at 14TeV

2,GeV/cAM100 200 300 400 500 600 700 800

!tan

1

10

CMS

scenariomaxh

m

2 = 1 TeV/c

SUSYM

2 = 200 GeV/c2M

2 = 200 GeV/cµ

2 = 800 GeV/c

gluinom

SUSY = 2 M

tStop mix: X

2=115 GeV/chm

-1,

cu

ts,

30

fb

""

#h

-1,

op

t.,

30

fb

""

#h

-1l+jet, 30 and 60 fb#$$#qqh, h

-1l+jet, 30 and 60 fb#$$#qqH, H


2,GeV/cAM100 200 300 400 500 600 700 800

!tan

10

20

30

40

50

-1CMS, 30 fb

= h,H,A", " bb#pp

scenariomaxh

m

2 = 1 TeV/c

SUSYM

2 = 200 GeV/c2M

2 = 200 GeV/cµ

2 = 800 GeV/c

gluinom

SUSY = 2 M

tStop mix: X

µ e

# $$ #

"

+jet

µ # $$

# "

e+jet# $$ # "

-1

jet+jet, 6

0 fb

# $$ # "

µµ

# "

ATL-PHYS-PUB-2010-011 CMS CERN-LHCC-2006-021

H± Sensitivity at 14TeV

July 30, 2010 27 )2(GeV/cAm

100 200 300 400 500 600

!ta

n10

20

30

40

50

60

70

80

""# $ ±, H± tbH$gg -1CMS, 30 fb

Maximal mixing scenario

2 = 200 GeV/c2

, M2 = 200 GeV/cµ2 = 1 TeV/c

SUSY, M2 = 2 TeV/ctX

Full simulation

Full simulation withsystematic uncertainties

Excluded by LEPEx

clud

ed b

y Te

vatr

on


2,GeV/cAM100 200 300 400 500 600

!tan

10

20

30

40

50

60

70

80-1

CMS, 30 fb

""# $ ±

, H±

tbH$pp 2

= 175 GeV/ctm

scenariomaxh

m

2 = 1 TeV/c

SUSYM

2 = 200 GeV/c2M

2 = 200 GeV/cµ

2 = 800 GeV/c

gluinom

SUSY = 2 M

tStop mix: X

jjb$ Wb $t

bl" l$ Wb $t

M. Hashemi et al., arXiv:0804.1228

!"#$%&'()

*+,!

-"$./0123'45$0',0/*/3/*5

ATLAS61',+4/2$7

89 ::9 :;9 :-9 :<9 =99 =-9 >99 ?99

-

:9

:-

=9

=-

;9

;-

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>-

-9

--

?9

;9$@A!:

:9$@A!:

:$@A!:

BCD$EF,$GGHI1JF.'.8-K$BL

mmaxh scenario



SUSY mSUGRA Sensitivity at 7TeV

July 30, 2010 28

ATLAS

ATLAS CMS

CMS


CMS NOTE 2010/008 ATL-PHYS-PUB-2010-010

MSSM Neutral Higgs XS

100 150 200 250 300 350 400 450 500

M! [GeV]

10-1

100

101

102

103

104

105

106

! p

roduction c

ross s

ection [fb

]h

H

A

LHC, "s = 14 TeV

mh

max, tan# = 5

(bb)!

gg!

qq!

W/Z!

tt!

FeynHiggs2.4

July 30, 2010 29

100 150 200 250 300 350 400 450 500

M! [GeV]

10-1

100

101

102

103

104

105

106

107

108

! p

rod

uctio

n c

ross s

ectio

n [

fb]

h

H

A

LHC, "s = 14 TeV

gluophobic Higgs, tan# = 40

(bb)!

gg!

qq!

W/Z!

tt!

FeynHiggs2.4

S. Heinemeyer


bbh associated prodcuUon

LHC Higgs XS working group

MSSM Charged Higgs tbH± Cross Section

July 30, 2010 30

Plehn, Dittmaier, Krämer, Spira, Walser


LHC Higgs XS working group

bsm higgs at lhc prospects end 2011 and before...ztautau zee zmumu wenu wmunu wtaunu single t t¯t...

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