1. Recent studies on sparticles and MSSM Higgses at CMS Massimiliano Chiorboli University and INFN Catania

2. Massimiliano Chiorboli 17-23 Feb 2002 Lake Louise Winter Institute OutlineOutline Minimal Supersymmetric Standard Model: theoretical aspects MSSM Higgses A,H l + l - l- -jet 2 -jets A,H 4l + X H + sbottom and gluino reconstruction

3. Massimiliano Chiorboli 17-23 Feb 2002 Lake Louise Winter Institute MSSMMSSM Higgs sector: 2 CP-even: h,H 1 CP-odd: A 2 charged: H Fermions: Fermions: quarks, leptons s = ½ Gauge Bosons: Gauge Bosons: W ±, Z 0,,gluons s = 1 Higgses Higgses s = 0 Sfermions: Sfermions: squarks, sleptons s = 0 Gauginos: Gauginos: Wino, Zino, fotino, gluino s = 1/2 Higgsinos s = 1/2 high tan gg Hbb H mixing

4. Massimiliano Chiorboli 17-23 Feb 2002 Lake Louise Winter Institute The CMS detector

5. Massimiliano Chiorboli 17-23 Feb 2002 Lake Louise Winter Institute A,H A,H Lepton ID from ECAL or -chambers l tagging by IP of the lepton (tracker) -jet: 1 (3) tracks, p T >40 GeV within R(jet,track)<0.03 no track, p T >1 GeV within 0.03 < R < 0.4 no stop mixing M SUSY =1 TeV, =-200 GeV, M 2 =200 GeV, X t =0

6. Massimiliano Chiorboli 17-23 Feb 2002 Lake Louise Winter Institute A,H ll 2 leptons, p t e, > 20 GeV, | e, | < 2.5 b-tagging of the associated jet -tagging through IP of the 2 hard l suppress W l and Z ll bkg no -tagging

7. Massimiliano Chiorboli 17-23 Feb 2002 Lake Louise Winter Institute A,H l + jet One isolated lepton, p T >15 GeV, | |<2.4 -jet, E T >40 GeV, | |<2.4 60° < (l – t-jet) < 175° E t miss > 20 GeV m T (l – E t miss ) < 30 GeV b-tagging of the associated jet m A =140 GeVm A =300 GeV tan =8 tan =15 tan =30 tan =40

8. Massimiliano Chiorboli 17-23 Feb 2002 Lake Louise Winter Institute A,H 2 jets 2 -jets, E T >60 GeV, | |<2.5 q i (jet1) * q i (jet2) < 0 in R<0.03 E t miss > 40 GeV ( -jet1 – -jet2) < 175° No E t miss cut 1 b-jet, E T >30 GeV

9. Massimiliano Chiorboli 17-23 Feb 2002 Lake Louise Winter Institute A,H 4l + X low tan Small H 0,A 0 – coupling SM bkg: ZZ, ZW, Zbb, Zcc, Wtb, tt SUSY bkg: direct sparticles production 4 isolated leptons, p T >10 GeV, | |<2.4 Z-veto 20 GeV < E t miss <130 GeV 2 jets, E T < 50 GeV

10. Massimiliano Chiorboli 17-23 Feb 2002 Lake Louise Winter Institute Charged Higgs In some cases (, bb) the neutral Higgs bosons may be hard to distinguish from the Standard Model Higgs at LHC H tb, higher BR, but large irreducible bkg H, lower BR, but more clean environment Observation of charged Higgs physics beyond SM

11. Massimiliano Chiorboli 17-23 Feb 2002 Lake Louise Winter Institute H H 1 -jet, E T >100 GeV, | |<2.5 E t miss > 100 GeV W and top mass reconstruction b-tagging ( -jet, E t miss ) > 60° gg tbH, H

12. Massimiliano Chiorboli 17-23 Feb 2002 Lake Louise Winter Institute 5 contours

13. Massimiliano Chiorboli 17-23 Feb 2002 Lake Louise Winter Institute Sparticles searches at CMS Until now, excesses over the SM… New studies: sparticle reconstruction… mSUGRA

14. Massimiliano Chiorboli 17-23 Feb 2002 Lake Louise Winter Institute Sparticle reconstruction p p b b 2 isolated leptons, p T >15 GeV, | |<2.4 2 b-jets, p T >20 GeV, | |<2 E t miss > 50 GeV tt, Z+jet, W+jet, ZZ, WW, ZW 10 fb -1 first 6 months at LHC

15. Massimiliano Chiorboli 17-23 Feb 2002 Lake Louise Winter Institute First step: 2 0 l + l - 1 0 p p b b Fit result:

16. Massimiliano Chiorboli 17-23 Feb 2002 Lake Louise Winter Institute Sbottom reconstruction E t miss > 150 GeV E t miss > 50 GeV p p b b Assuming M( 1 0 ) known!

17. Massimiliano Chiorboli 17-23 Feb 2002 Lake Louise Winter Institute Sbottom mass peak Result of fit: Generated masses:

18. Massimiliano Chiorboli 17-23 Feb 2002 Lake Louise Winter Institute Gluino reconstruction p p b b E t miss > 150 GeV Generated mass: Result of fit:

19. Massimiliano Chiorboli 17-23 Feb 2002 Lake Louise Winter Institute Combinatorial suppression sbottom gluino

20. Massimiliano Chiorboli 17-23 Feb 2002 Lake Louise Winter Institute estimation estimation doesnt depend on M( 1 0 ) ! Result of fit:

21. Massimiliano Chiorboli 17-23 Feb 2002 Lake Louise Winter Institute ConclusionsConclusions CMS will be able to discover MSSM Higgses within the first 2 years of run in wide m A -tan regions (A,H Far from bounds (high tan ), mass peaks recontruction possible Decays into sparticles can cover low tan regions Sparticle reconstruction possible within the first 6 months of running for some mSUGRA parameter regions Gluino and sbottom mass peak, dependent on M( 1 0 ) M(gluino) – M(sbottom), independent of M( 1 0 )

22. Massimiliano Chiorboli 17-23 Feb 2002 Lake Louise Winter Institute H tb

23. Massimiliano Chiorboli 17-23 Feb 2002 Lake Louise Winter Institute h h excellent ECAL resolution large prompt bkg m H = 120 GeV 100 fb -1 SM MSSM