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Supersymmetric Higgs(es) in LHC(b)

Supersymmetric Higgs(es) in LHC(b). Agnieszka Jacholkowska 2 nd Generator Workshop Lausanne 02/03/2001. SUSY. SM insufficiencies (beside exp. success) SSB  masses, 3 coupling unification, hierarchy, unification with gravity, …

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Supersymmetric Higgs(es) in LHC(b)

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

  2. SUSY • SM insufficiencies (beside exp. success) • SSB  masses, 3 coupling unification, hierarchy, unification with gravity, … supersymmetry :m~  1.2 TeV ( m2H  / 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 LMSSM = LSUSY + Lsoft (ex. mSUGRA) ( m2H not divergent ) R parity = (-1)3(B-L) + 2S + standard conserved - SUSY  exists LSP (combination higgsino – gaugino) serious candidate for CDM

  3. GUT hypothesis • Universality of masses and couplings at MGUT ~ 1016 GeV   ~ mZ (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 Ab = trilinear couplings sbottoms At = trilinear couplings stops Scenario relevant for SUSY particles ! • MSSM : Higgs sector 63 parameters + SM LO tg , m A NLO tg , m A , mt, At, (  ) universality at  ~ mZ

  4. 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 mh< 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 mh  mhmax h  charm, gluons (5%) and WW* (20%) • small tg  : complicated scheme, h  b b~ not dominant

  5. SUSY Higgs boson decays A. Djouadi, hep-ph 9703230

  6. SUSY Higgs boson decays A. Djouadi, hep-ph 9703230

  7. SUSY Higgs boson decays A. Djouadi, hep-ph 9703230

  8. Production of Higgs bosons • LEP2, Linear Colliders e+e- hZ, HA  ~ sin2( - ) LEP2 Higgs at 115 GeV ? hA, HZ  ~ cos2( - ) • 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. Existing generators • PYTHIA 6.1 contains SPYTHIA framework of h0, H0, A,H+- scenario • MSSM mZ   1 TeV softly broken SUSY NLO calculations + RGE approach tg , m A , mt, At, (  ) • mSUGRA running exists – less relevant for Higgs • HDECAY • Djouadi, J.Kalinowski, M.Spira theoretically very complete (all decay channels with BR  10-4) • QCD corrections with running masses • below threshold 3 body decays • double off-shell decays • decays into SUSY particles • loop mediated h,H  , gg

  10. 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 mmax various backgrounds suppression b jet identification will be studied in various SUSY scenarios

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