1. 14-04-2011HEP Conference 1 NMSSM Higgs Search Search for neutral NMSSM Higgs Studies at 10 TeV, and with the 2010 data @ 7 TeV Jehad Mousa University of Cyprus ANNUAL MEETING OF THE HELLENIC SOCIETY FOR THE STUDY OF HIGH ENERGY PHYSICS April 14-16, 2011, University of Patras, Greece

2. 14-04-2011HEP Conference 2 NMSSM  The Next-to-Minimal Supersymmetric Standard Model (NMSSM) extends the MSSM by the introduction of a singlet superfield ( )  The NMSSM naturally solves the μ-problem of the MSSM.  The Higgs sector of the NMSSM contains (three CP-even bosons h1, h2, h3 and two CP-odd higgs bosons α1, α2) and two charged higgs bosons (h  ).

3. 14-04-2011HEP Conference 3 The benchmark points The lightest pseudoscalar higgs boson is rather light, and the lightest CP-even higgs has enough phase space for the decay into two pseudoscalar higgs boson, to be kinematically accessible. The BR for the decay is very large and this new channel is the dominant one. Concerning the further decay of the lightest pseudoscalars, there are two possibilities: – Either and the boson decays into a pair of b quarks or a pair of tau leptons, leading to and final states, – or and the dominant decay mode of the boson is into a pair of tau leptons, leading to final state.

4. 14-04-2011HEP Conference 4 Channels investigated and associated background The signal process: A Vector Boson Fusion: Two different types of scenarios are considered, depending on  Scenarios with are disfavored when LEP data for Z2b and Z4b final states are taken into account.  On the contrary, scenarios with are favored by the same data and can even account for 2σ excess observed in the Z2b final state in the vicinity.

5. 14-04-2011HEP Conference 5 Channels investigated and associated background higgs-strahlung: The decay, with produced in higgs-strahlung with leptonic decays of the W or Z boson, which can give a very clean and almost background free signal, is one of the most promising higgs decay channels according to the last investigation of phenomenological scenarios

6. 14-04-2011HEP Conference 6 Channels investigated and associated background Background processes:  ZZjj and WZjj production:  TTbar production: t  Wb  Zbbbar and Wbbbar production:

7. 14-04-2011HEP Conference 7 Cross Section @ 10 TeV Vector Boson Fusion M h (GeV)Typical cross –section for VBF (fb) LONLO 10532.6831.69 11529.8128.93 12527.1626.39 13524.9524.29 14523.1922.52 For L = 200 pb -1, N LO = 6.5 and N NLO = 6.3 M. Spirq, Fortsch Phys. 46 (1998) 203, http://people.web.psi.ch/spira/proglist.html 92.6% 17.8%65.4%93.8%

8. 14-04-2011HEP Conference 8 Cross Section

9. 14-04-2011HEP Conference 9 μ-τ Skim Muon Global Muons, P t > 6 GeV, abs(η) <2.5 Tau caloRecoTauDiscrimainationByLeadingTrackPtCut: 0.5 Calo Tau: Leading Track P t > 5GeV within ΔR matching = 0.1 Muon-Tau DiTauAntiOverlapSelector ΔR = 0.01 SampleGen Events σ (fb)MC Filter Efficiency Skim Efficiency 88400032.6810.87740 ZZ  4l902140189.860.31650.74316 Zbb  4l1063204562000.0070.74925 10110622909000.003170.86100

10. 14-04-2011HEP Conference 10 Event Selection Vertex Selection  p(chi2Vertex) > 0.01  -25 < zVertex < +25 cm Muon Selection  global Muon  -2.1 < eta(Muon) < +2.1  Pt(Muon) > 8 GeV  Muon Track iso.  Muon ECAL iso.  Muon pi-Veto  Muon Track IP Tau Selection  Tau not overlapping w. Muon  -2.1 < eta(Tau) < +2.1  Pt(Tau) > 10 GeV  Tau lead. Track find.  Tau lead. Track Pt  Tau 1||3-Prong  Charge(Tau) = +/-1  Tau mu-Veto  Tau Electron-Veto

11. 14-04-2011HEP Conference 11 Event Selection Muon-Tau Selection  Charge(Muon+Tau) = 0  Acoplanarity(Muon+Tau)  M T (Muon-MET) < 50 GeV  dR(Muon-Tau) < 0.5 a-a Selection  dR(a-a) > 0.3  Acoplanarity (a+a)  M T (a-MET) < 50 GeV Normalized

12. 14-04-2011HEP Conference 12Cuts 5.031 5.029 4.737 4.444 3.815 3.813 3.712 3.333 3.260 3.194 3.191 131.997 131.989 130.895 128.882 126.768 126.766 126.483 110.132 106.785 104.809 102.897 6.637 6.633 6.617 6.503 6.454 6.446 6.420 5.212 5.192 5.188 5.164 CutHtoaaTTbarFourlZZFourlllbb gen. Phase-Space Vertex p(chi2Vertex) > 0.01 -25 < zVertex < +25 cm global Muon -2.1 < eta(Muon) < +2.1 Pt(Muon) > 8 GeV Tau not overlapping w. Muon -2.1 < eta(Tau) < +2.1 Pt(Tau) > 10 GeV Muon Track iso. Muon ECAL iso. Muon pi-Veto Muon Track IP 44.129 44.118 43.862 42.785 42.125 42.124 42.091 38.381 35.580 34.986 34.561 34.026

13. 14-04-2011HEP Conference 13 Tau lead. Track find. Tau lead. Track Pt Tau 1||3-Prong Charge(Tau) = +/-1 Tau mu-Veto Tau Electron-Veto dR(Muon-Tau) < 0.5 Charge(Muon+Tau) = 0 Acoplanarity(Muon+Tau) M_{T}(Muon-MET) < 50 GeV dR(a-a) > 0.3 Acoplanarity(a+a) M_{T}(Muon-MET) < 50 GeV 3.061 2.975 1.726 1.704 1.484 1.403 0.244 0.224 0.216 0.145 0.002 101.655 100.234 78.144 76.607 71.210 47.493 5.572 3.270 2.062 1.174 0.002 Cuts 4.238 4.123 3.737 3.725 3.503 0.723 0.013 0.007 0.006 0.003 0.000 27.845 25.810 17.517 17.122 14.532 6.261 1.014 0.613 0.582 0.410 0.000

14. 14-04-2011HEP Conference 14 Muon Identification Muon Reconstruction  Muons: “global muons” P T Resolution /

15. 14-04-2011HEP Conference 15 Tau Identification Tau Reconstruction  Taus: particle-flow techniques “PFTau” P T Resolution /

16. 14-04-2011HEP Conference 16 Missing Transverse Energy (MET) The pfMET algorithm P MET Resolution  MET Resolution

17. 14-04-2011HEP Conference 17 Total number of Taus and muons

18. 14-04-2011HEP Conference 18 Mass Reconstruction P Tmiss vμvμ μ a1a1 τ vτvτ μ had vμvμ a1a1 h1h1 τ vτvτ  The mass and P T of the h are sufficiently large to give a considerable boost to its decay products. The direction of the a 1, of the two τ, of the two μ, of the two hadron and of the three neutrinos are then nearly parallel.  The missing transverse momentum originates exclusively from the neutrinos from the decay chain of the h.  The masses of the final state leptons and the a 1 are neglected compared to the typical mass of h 1.

19. 14-04-2011HEP Conference 19 Collinear Approximation

20. 14-04-2011HEP Conference 20 x 1 and x 2 before Muon-Tau Selection

21. 14-04-2011HEP Conference 21 ΔR and mass distributions between muon-  jet

22. 14-04-2011HEP Conference 22 ΔR and mass distributions between a-a

23. 14-04-2011HEP Conference 23 Invariant mass of a and h using Collinear Approximation

24. 14-04-2011HEP Conference 24 Data and Monte Carlo Samples at 7 TeV Data Run-range /Mu/Run2010A-Nov4ReReco_v1/RECO 136033-144114 /Mu/Run2010B-Nov4ReReco_v1/RECO 146428-149442 Trigger Path HLT_Mu9, HLT_IsoMu9, HLT_Mu11, HLT_Mu15, HLT_IsoMu13 HLT_IsoMu9_PFTau15, HLT_IsoMu11_PFTau15 SampleGen Events σ (fb) (NLO) MC Filter Efficiency Skim Efficiency 69300014.4410.7344 Monte Carlo

25. 14-04-2011HEP Conference 25

26. 14-04-2011HEP Conference 26 Efficiency Selection

27. 14-04-2011HEP Conference 27 mass distributions

28. 14-04-2011HEP Conference 28 ΔR and mass distributions between muon-  jet

29. 14-04-2011HEP Conference 29 ΔR and mass distributions between a-a

30. 14-04-2011HEP Conference 30Conclusion  Results of a search for NMSSM neutral Higgs to four taus productions in the channel 2mu + 2tau have been presented.  No evidence fo a NMSSM neutral Higgs signal in the proton-proton collision data collected by the CMS experiment in 2010 is found.

31. 14-04-2011HEP Conference 31Thanks We acknowledge support from Research Promotion Foundation (IPE) cyprus