Lausanne 02/03/2001 A.Jacholkowska1 Supersymmetric Higgs(es) in LHC(b) Agnieszka Jacholkowska 2 nd Generator Workshop Lausanne 02/03/2001

2 Lausanne 02/03/2001 A.Jacholkowska SUSY  SM insufficiencies (beside exp. success) SSB  masses, 3 coupling unification, hierarchy, unification with gravity, …  supersymmetry : m~  1.2 TeV (  m 2 H   /   2 ) Fermions ( s=1/2)  Bosons (s= 0,1) f  f~ L, f~ R sfermions W~,Z~,  ~,H~ : gaugino  H, W, Z,  higgsino BUT : supersymmetry is broken - models MSSM L MSSM = L SUSY + L soft (ex. mSUGRA) (  m 2 H not divergent ) R parity = (-1) 3(B-L) + 2S + standard conserved - SUSY  exists LSP (combination higgsino – gaugino) serious candidate for CDM

3 Lausanne 02/03/2001 A.Jacholkowska GUT hypothesis Universality of masses and couplings at M GUT ~ GeV   ~ m Z (m~, couplings) RGE  7 parameters in mSUGRA tg  = ratio of Higgs v.e.v. m A = CP-odd Higgs mass m 0 = universal mass of squarks m 1/2 = gaugino mass  = Higgs- higgsino mass parameter A b = trilinear couplings sbottoms A t = trilinear couplings stops Scenario relevant for SUSY particles ! MSSM : Higgs sector 63 parameters + SM LO tg , m A NLO tg , m A, m t, A t, (  ) universality at  ~ m Z

4 Lausanne 02/03/2001 A.Jacholkowska Supersymmetric Higgs bosons in MSSM Extension of SM Higgs sector 3 neutral h/H (CP +), A (CP -) and 2 charged H +- with large radiative corrections m h < 130 GeV H, A, H +- heavy ~ O (100 GeV) Decays determined by : Couplimgs to fermions and gauge bosons  g(uu~) g(dd~) g(VV) h cos  /sin   1 -sin  /cos   1 sin(  -  )  1 H sin  /sin   1/tg  cos  /cos   tg  cos(  -  )  0 A 1/tg  tg  0 Dependence on tg ,  mixing angle in CP even sector large tg  : h  b b~ ( 90% ),  +  - ( 10% ) H +(-)   +(-)  but if m h  m h max h  charm, gluons (5%) and WW* (20%)  small tg  : complicated scheme, h  b b~ not dominant

5 Lausanne 02/03/2001 A.Jacholkowska SUSY Higgs boson decays A. Djouadi, hep-ph

6 Lausanne 02/03/2001 A.Jacholkowska SUSY Higgs boson decays A. Djouadi, hep-ph

7 Lausanne 02/03/2001 A.Jacholkowska SUSY Higgs boson decays A. Djouadi, hep-ph

8 Lausanne 02/03/2001 A.Jacholkowska Production of Higgs bosons LEP2, Linear Colliders e+e-  hZ, HA  ~ sin 2 (  -  ) LEP2 Higgs at 115 GeV ? hA, HZ  ~ cos 2 (  -  ) LHC : pp gg fusion : b large QCD background h b Higgsstrahlung qq~ h(bb~) q~ V q V h gg tt~h(bb~) To be (re)investigated t, b, Z … background suppression b jet identification CP violation in the Higgs sector

9 Lausanne 02/03/2001 A.Jacholkowska Existing generators PYTHIA 6.1 contains SPYTHIA framework of h 0, H 0, A,H +- scenario MSSM m Z    1 TeV softly broken SUSY NLO calculations + RGE approach tg , m A, m t, A t, (  ) mSUGRA running exists – less relevant for Higgs HDECAY A. Djouadi, J.Kalinowski, M.Spira theoretically very complete (all decay channels with BR  ) QCD corrections with running masses below threshold 3 body decays double off-shell decays decays into SUSY particles loop mediated h,H  , gg

10 Lausanne 02/03/2001 A.Jacholkowska Prospects and plans Potential for low mass SUSY Higgs boson(s) will be investigated in LHCb on generator level PYTHIA  6.1 HDECAY which needs interfacing in LHCb detector : re-evaluate Higgs boson m max various backgrounds suppression b jet identification will be studied in various SUSY scenarios