17 April. 2005,APS meeting, Tampa,FloridaS. Bhattacharya 1 Satyaki Bhattacharya Beyond Standard Model Higgs Search at LHC

17 April. 2005,APS meeting, Tampa,FloridaS. Bhattacharya 2 * numbers are for barrel data taking starts 2007 Startup Luminosity cm -2 /s that is: 10 fb -1 per year Silicon Tracker PbWO 4 ECAL sampling brass HCAL solenoid 4Tesla field MUON Chambers

17 April. 2005,APS meeting, Tampa,FloridaS. Bhattacharya 3 Higgs in MSSM

17 April. 2005,APS meeting, Tampa,FloridaS. Bhattacharya 4 MSSM Higgs sector Two Higgs doublets 8 real Higgs fields ( 4 complex fields) 3 fields are gauged away All masses, and mixing angle  are determined by two independent parameters, generally taken as tan  – ratio of vacuum expectation values of the two doublets M A – mass of pseudoscalar Higgs A pseudoscalar Higgs charged Higgs heavy Higgs light Higgs

17 April. 2005,APS meeting, Tampa,FloridaS. Bhattacharya 5 MSSM Higgs Production h production x-sections similar to SM higgs in decoupling region gg  h largest gg  H/A most important at low tan  at high tan  gg/qq  Hbb dominant for H/A for H ± tt  tH - b is most important

17 April. 2005,APS meeting, Tampa,FloridaS. Bhattacharya 6 CMS Detector: schematic X-sectional view HCAL ECAL TRACKER h   Two clean electromagnetic clusters (For unconverted photons) Backgrounds: gg,qq  ,qg  q luminosity jet-jet 10 5 events/s jet+photon 10 2 events/s 2 photon 1 event/12.5s Higgs 1 event/25s h  2photon 1 luminosity jet-jet 10 5 events/s jet+photon 10 2 events/s 2 photon 1 event/12.5s Higgs 1 event/25s h  2photon 1 event/10,000s two photon background gamma+jet background

17 April. 2005,APS meeting, Tampa,FloridaS. Bhattacharya 7 h   mass resolution   =646MeV events/50MeV m  for 130 GeV Higgs CMS full detector simulation. Ref: CMS Note 2003/033

17 April. 2005,APS meeting, Tampa,FloridaS. Bhattacharya 8 A/H       jets + X backgrounds: Z/   2  multijets 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: gg  bbH/A and gg  H/A Decay: H/A   +   M A 500GeV: .Br=0.188pb M A 200GeV: .Br=9.53pb ~15% mass resolution Higgs signal over total background Pythia simulation Ref: CMS Note 2003/006 Mass can be reonstructed assuming || 

17 April. 2005,APS meeting, Tampa,FloridaS. Bhattacharya 9 h 30fb -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

17 April. 2005,APS meeting, Tampa,FloridaS. Bhattacharya 10 A/H and H ± Discovery Regions At large tan  A/H coupling to down type fermion is strong and H production with bb and H decay to  become important For charged Higgs associated production with top is dominant

17 April. 2005,APS meeting, Tampa,FloridaS. Bhattacharya 11 Summary At LHC Higgs mass range between LEP bounds and ~1 TeV can be probed Atleast one MSSM Higgs will be found in entire M A -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-ph for more information

17 April. 2005,APS meeting, Tampa,FloridaS. Bhattacharya 12 The End

17 April. 2005,APS meeting, Tampa,FloridaS. Bhattacharya 13 Higgs Production in MSSM(details) H/A production –gg  H/A, gg/qq  bbH/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 M A )  VBF significant h production –h SM-like for M A >m h max H ± production For M H± <M t : tt  tH ± b For M H± >M t : –gg  tbH ±,H + H -,W ± H ± –gb  tH ± –qq  H ± Higgs couplings with up(u) down(d) fermions and vector bosons (v)

17 April. 2005,APS meeting, Tampa,FloridaS. Bhattacharya 14 MSSM Higgs Production (updated from M. Spira)

17 April. 2005,APS meeting, Tampa,FloridaS. Bhattacharya 15 MSSM Higgs Production (ii)

17 April. 2005,APS meeting, Tampa,FloridaS. Bhattacharya 16 channels considered for a SUSY Higgs H/h  , bb –H->bb in WH,ttH –h->  in Wh, tth->l  H/h  ZZ*/ZZ  4l h/H/A         (e/  jE T  e  E T, jjE T –Including qqH,ttH,WH H +     from tt H +   , H +  tb for M H+ >M t A  Zh with h  bb A   H/A          i   j       H ±   +     ~~~~ ~ ~ ~ ~

17 April. 2005,APS meeting, Tampa,FloridaS. Bhattacharya 17 A/H       jets + X (detailed efficiency)

17 April. 2005,APS meeting, Tampa,FloridaS. Bhattacharya 18 H/A      pp  bbH/A + X with H/A      2  soft  (E T < 50  GeV) b jets –Use b-tag against Z/  * background –Use central jet veto against tt Mass resolution 1%, |m H -m A | ~ 2 GeV  H/A peaks superimposed (mass difference can be upto ~ 5.5 GeV)

17 April. 2005,APS meeting, Tampa,FloridaS. Bhattacharya 19 CMS Trigger Rates CMS total level1 rate is 16 kHz at startup Total High Level Trigger (HLT) is 100 Hz.

17 April. 2005,APS meeting, Tampa,FloridaS. Bhattacharya 20 Extra Slides on Standard Model Higgs

17 April. 2005,APS meeting, Tampa,FloridaS. Bhattacharya 21 Higgs production at LHC gg  H High gluon flux – dominant although loop process Vector Boson Fusion (VBF) 10% at M H =100GeV Comparable to gg->H at M H =1 TeV ttH, bbH,HW,HZ

17 April. 2005,APS meeting, Tampa,FloridaS. Bhattacharya 22 Decays and Search Strategy M H < ~140 GeV H  bb dominant gg  H  bb : background too large ttH  ttbb possible H   –  small BR but very clean M H < ~500 GeV GeV H  WW*/WW  l l  (serious t ,Wtb background) GeV H  ZZ  4l gives highest sensitivity between GeV M H > ~500 GeV  H large, use channels with large BR, H  ZZ/WW VBF x-sec large and can be used search channels

17 April. 2005,APS meeting, Tampa,FloridaS. Bhattacharya 23 Discovery reach of CMS CMS can probe the entire “allowed” mass range 5  discovery possible in few months in many channels Total H   H  ZZ  l + l - l + l - H  WW  ll