17 april. 2005,aps meeting, tampa,floridas. bhattacharya 1 satyaki bhattacharya beyond standard...
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17 April. 2005,APS meeting, Tampa,Florida S. Bhattacharya 1
Satyaki
Bhattacharya
Beyond Standard Beyond Standard Model Higgs Model Higgs
Search at LHCSearch at LHC
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* numbers are for barrel
data taking starts 2007
Startup Luminosity 1033 cm-2/s
that is: 10 fb-1 per year
Silicon Tracker15 ( )%T
TT
p p TeVp
2.7% 0.150.5% E
E EE
PbWO4 ECAL
sampling brass HCAL 120
5%E
E E
solenoid4Tesla field
1.0 1.5%@100T
T
pglobal GeV
p
MUON Chambers
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Higgs in Higgs in MSSM MSSM
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MSSM Higgs sector MSSM Higgs sector
01
1
H
H
02
2
H
H
Two Higgs doublets
8 real Higgs fields( 4 complex fields)
3 fields are
gauged away
01
0
0 02
cos sin
sin cos
H
h
0 01 2
0 , ,, , A H H
All masses, and mixing angle are determined by two independent parameters, generally taken as
tan – ratio of vacuum expectation values of the two doubletsMA – mass of pseudoscalar Higgs A
pseudoscalar Higgs
charged Higgs
heavy Higgs
light Higgs
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MSSM Higgs Production MSSM Higgs Production
h production x-sections similar to SM higgs in decoupling regionggh largest
ggH/A most important at low tan
at high tangg/qqHbb dominant for H/A
for H± tttH-bis most important
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CMS Detector: schematic X-sectional view
HCAL
ECAL
TRACKER
h h Two clean electromagnetic clusters(For unconverted photons)
Backgrounds: gg,qq,qgq @low luminosityjet-jet 105 events/sjet+photon 102 events/s2 photon 1 event/12.5sHiggs 1 event/25sh2photon 1 event/10,000s
@low luminosityjet-jet 105 events/sjet+photon 102 events/s2 photon 1 event/12.5sHiggs 1 event/25sh2photon 1 event/10,000s
two photon background
gamma+jet background
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hh mass resolutionmass resolution
=646MeVe
ven
ts/5
0M
eV
mfor 130 GeV Higgs
CMS full detector simulation. Ref: CMS Note 2003/033
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A/HA/H jets + X jets + X
backgrounds: Z/2multijets faking tt and W+jet with W
reduce background by requiring: high pt narrow jet, isolation, b-tag, impact parameter
NLO x-section used
Signal:Production: ggbbH/A and ggH/ADecay: H/A+
MA 500GeV: .Br=0.188pbMA 200GeV: .Br=9.53pb
~15% mass resolution
Higgs signal over total backgroundPythia simulation
Ref: CMS Note 2003/006
Mass can be reonstructed assuming ||
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h discovery @ 30fbh discovery @ 30fb-1-1
Decay branching ratios and searches for h are like SM Higgs
Ref: CMS Note 2003/033
5 discovery with 30 fb-1 possible in this region using h decay
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A/H and HA/H and H± ± Discovery RegionsDiscovery Regions
At large tanAt large tan A/H coupling to A/H coupling to down type fermion is strong and down type fermion is strong and H production with bH production with bb b and H and H decay to decay to become important become important
For charged Higgs associated For charged Higgs associated production with top is dominantproduction with top is dominant
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SummarySummary
• At LHC Higgs mass range between LEP bounds and ~1 TeV can be probed
• Atleast one MSSM Higgs will be found in entire MA-tan plane
• All MSSM Higgs should be visible in large region of the parameter space
• 5 discovery possible with 30 fb-1 in large region of the parameter space
• Few hundred MeV mass resolution for light Higgs from h
cmsdoc.cern.ch/~anikiten/cms-higgs/Higgs Working Group Summary, Les Houches 2004,hep-ph0406152
for more information
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The EndThe End
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Higgs Production in MSSM(details)Higgs Production in MSSM(details)
• H/A production– ggH/A, gg/qqbbH/A– g(AVV)=0 no VBF– At large tanβ
• VBF suppressed for H• g(A/Hbb) enhanced
~90% bbH/A for tanβ>10 and MA>300 GeV
– H SM-like near lower mass limit ( high tanβ, small
MA)VBF significant
• h production– h SM-like for MA>mh
max
• H± productionFor MH±<Mt : tttH±b
For MH±>Mt:
– ggtbH±,H+H-,W±H±
– gbtH±
– qqH±
Higgs couplings with up(u) down(d) fermions and vector bosons (v)
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MSSM Higgs Production (updated from M. Spira)MSSM Higgs Production (updated from M. Spira)
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MSSM Higgs Production (ii)MSSM Higgs Production (ii)
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channels considered for a SUSY Higgschannels considered for a SUSY Higgs• H/h , bb
– H->bb in WH,ttH– h-> in Wh, tth->l
• H/hZZ*/ZZ4l • h/H/A(e/jETeET, jjET
– Including qqH,ttH,WH
• H+from tt• H+, H+tb for MH+
>Mt
• AZh with hbb• A• H/A ij• H±+
~ ~ ~ ~ ~
~
~
~
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A/HA/H jets + X (detailed efficiency) jets + X (detailed efficiency)
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H/A H/A
• ppbbH/A + X with H/A
2soft(ET< 50GeV) b jets
– Use b-tag against Z/* background
– Use central jet veto against tt
Mass resolution 1%, |mH-mA| ~ 2 GeVH/A peaks superimposed
(mass difference can be upto ~ 5.5 GeV)
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CMS Trigger RatesCMS Trigger Rates
CMS total level1 rate is 16 kHz at startupTotal High Level Trigger (HLT) is 100 Hz.
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Extra Slides on Extra Slides on Standard Model Standard Model
HiggsHiggs
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Higgs production at LHCHiggs production at LHCggH
High gluon flux – dominant although loop process
Vector Boson Fusion (VBF)
10% at MH=100GeV
Comparable to gg->H at MH=1 TeV
ttH, bbH,HW,HZ
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Decays and Search StrategyDecays and Search StrategyMH < ~140 GeV
Hbb dominantggHbb : background too large
ttHttbb possible
H–small BR but very clean
MH < ~500 GeV 120-200 GeV
HWW*/WWll(serious t,Wtb background)
200-500 GeVHZZ4l gives highest sensitivity
between 200-500 GeV
MH > ~500 GeVH large, use channels with large BR,
HZZ/WW
VBF x-sec large and can be used
sear
chch
anne
ls
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Discovery reach of CMSDiscovery reach of CMS
• CMS can probe the entire “allowed” mass range
• 5 discovery possible in few months in many channels
Total
HHZZl+l-l+l-HWWll