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Associated Higgs Production with WH  WWW*  l  l  l 

Associated Higgs Production with WH  WWW*  l  l  l . Nishu, Suman B. Beri, Vipin Bhatnagar Panjab University, Chandigarh. Introduction.

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Associated Higgs Production with WH  WWW*  l  l  l 

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  1. Associated Higgs Production with WH WWW*  l l l Nishu, Suman B. Beri, Vipin Bhatnagar Panjab University, Chandigarh

  2. Introduction This channel involves the production of a Higgs boson in association with a W boson where the Higgs boson subsequently decays into a pair of W bosons. The final state consists of three leptons and missing transverse energy from the W lν decays. The Higgs-Strahlung process (WH), being one of the 4 mechanisms for the production of Higgs at LHC is an important channel to understand for completeness of study of Higgs searches. Also H  WW* is a dominant decay mode with a Higgs mass > 140 GeV/c2 . Feynman diagram

  3. MC Samples Requested • Earlier work done - Self generated MC data samples. • MC samples requested with the production team . • Samples now available on the DBS page. Requested Samples: Signal : WH  WWW  l l l with a Higgs mass = 130 , 140 ,150 GeV/c2 Background  : WWW (3 l )                    : WZ (3 l)                      : ZZ (4 l )                       :ttbar ( l+ l- b bbar)         : Wt (l+ l- b)      

  4. Cross Sections for the Signal and Background processes Signal: WH (Higgs mass = 130 GeV/c2) 45.67 fb WH (Higgs mass = 140 GeV/c2) 63.23 fb WH (Higgs mass = 150 GeV/c2) 73.05 fb Background Processes : WZ  3 l± 1.025 pb ZZ  4 l± 0.105 pb

  5. Some details about the Work • This work is done using CMS Software version CMSSW_2_1_8 and PAT . • Higgs mass has taken to be 130 GeV/c2 for the present work. • MC samples Used: /WH_130_3W_2lX/Summer08_IDEAL_V9_v2/GEN-SIM-RECO /WZ_3l/Summer08_IDEAL_V9_v2/GEN-SIM-RECO /ZZ_4l/Summer08_IDEAL_V9_v2/GEN-SIM-RECO • For the present study, we are taking the particular case of 1e and 2 muons in the final state.

  6. PT distribution for leptons PT distribution for electrons PT distribution for muons To avoid some fake leptons , a cut of PT > 15 GeV/c and || < 2.5 has been applied on leptons.

  7. Dimuonmass Plot In ZZ and WZ backgrounds, a lepton pair originates from Z. So the events within a mass range of 80 – 100 GeV/c2 are rejected to reduce this background .

  8. Missing Transverse Energy (MET) As the signal events are having a significant amount of missing transverse energy. So a cut of MET > 40 GeV/c2 can be used to suppress the ZZ background.

  9. PT distribution for leptons after applying the cuts PT distribution for electrons PT distribution for muons

  10. Efficiencies of the Selection Cuts • Mz < 80 GeV/c2 & MZ >100 GeV/c2 WH WZ ZZ 88.48% 35.45% 36.98% • MET > 40 GeV/c WH WZ ZZ 68.07% 55.45% 26.8%

  11. Acoplanarity (∆) between the 2 muons

  12. Future Plans • To continue with this work using latest versions of CMSSW and PAT. • To introduce some other cuts so as to reduce the • background. • To study the signal process with Higgs mass of 140 • and 150 GeV/c2 as well. • To study other background processes involved in this channel – WWW , Wt and ttbar.

  13. THANKS

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