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Report from the Squark Subgroup

Report from the Squark Subgroup. Michael Klasen University of Grenoble I 26 March 2007. 7 + 2 - 1 Contributions. SUSY Higgs bosons: SUSY H production and FCNC decay SUSY H  bs decay and B-physics complementarity Squark/gaugino production and decay

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Report from the Squark Subgroup

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  1. Report from the Squark Subgroup Michael Klasen University of Grenoble I 26 March 2007

  2. 7+2-1 Contributions • SUSY Higgs bosons: • SUSY H production and FCNC decay • SUSY H  bs decay and B-physics complementarity • Squark/gaugino production and decay • All NMFV amplitudes, phenomenology for 3rd gen. production • Top squark production and decay: • Associated light stop + chargino production • Gluino  light stop decay • Light stop detection with ATLAS • Stop searches with CMS (not received) • Stop  right-handed sneutrino LSP decay Michael Klasen, Univ. Grenoble I

  3. M.Beccaria (Lecce) S. Bejar (Barcelona) G. Bozzi (Karlsruhe) A. de Gouvea (Evanston) B. Fuks (Grenoble) S. Gopalakrishna (Evanston) J. Guasch (Barcelona) T. Hahn (Munich) B. Herrmann (Grenoble) W. Hollik (Munich) J. Illana (Granada) M. Klasen (Grenoble) S. Kraml (Grenoble & CERN) T. Lari (Milano) G.Macorini (Trieste) L.Panizzi (Trieste) S. Penaranda (Valencia) G. Polesello (Pavia) W. Porod (Würzburg) A. Raklev (Bergen & CERN) F.Renard (Montpellier) J. Sola (Barcelona) A. Tricomi (Catania) C.Verzegnassi (Trieste) 24+3-3 Participants Michael Klasen, Univ. Grenoble I

  4. SUSY Higgs ProductionBejar, Guasch, Sola, hep-ph/0508043 • Cross section: • HIGLU 2.101 and PPHTT 1.1 • Leading order only • Running mq and as • Default scales • CTEQ4L PDFs • Scan MSSM for smax: Michael Klasen, Univ. Grenoble I

  5. SUSY Higgs Decays (1)Bejar, Guasch, Sola, hep-ph/0508043 • Branching ratios ( FCHDECAY): • Partial decay widths: 1-loop SUSY-QCD corrections • FCNC Higgs couplings: • Total decay width: All channels, LO only • Higgs mass / tan a : leading mt, mb tan b approximation • Constraints on : • B(bsg) = (2.1 - 4.5) 10-4 (3s), same sign as in SM • SUSY-QCD contribution: Michael Klasen, Univ. Grenoble I

  6. h  bs [ ] h  tc SUSY Higgs Decays (2)Bejar, Guasch, Sola, hep-ph/0508043 Michael Klasen, Univ. Grenoble I

  7. SUSY Higgs Decays (3)Hahn, Hollik, Illana, Penaranda, hep-ph/0512315 • B(H0, A0 bs): • FeynArts/FormCalc/LoopTs • All 1-loop SM/SUSY cont.s • B(b  sg): • NMFV operators: • NLO QCD [Kagan, Neubert] • 1-loop SUSY contributions • MSSM scenario: Disfavored by b smm Allowed by b sg Michael Klasen, Univ. Grenoble I

  8. SUSY Higgs Decays (4)Hahn, Hollik, Illana, Penaranda, hep-ph/0512315 Michael Klasen, Univ. Grenoble I

  9. Scans of NMFV Parameter SpaceBozzi, Fuks, Herrmann, MK, LPSC 07-023 • Theoretical constraints: • , • Experimental constraints (2s): • Low energy (FeynHiggs): [m>0] • Dark matter (DarkSUSY): • mSUGRA plane (m1/2 vs. m0): tan b = 10, 30, 50 Michael Klasen, Univ. Grenoble I

  10. Proposal of 4 NMFV Benchmark PointsBozzi, Fuks, Herrmann, MK, LPSC 07-023 • 4 collider-friendly NMFV benchmark points: • l-dependence of exp. constraints (point B): • Flavour-decomposition of lighter squarks: Michael Klasen, Univ. Grenoble I

  11. Squark mass matrix: Squared helicity amplitudes: Gauge boson couplings: Gluino coupling: Gaugino couplings: Squark/Gaugino Production (1)Bozzi, Fuks, Herrmann, MK, LPSC 07-023 Michael Klasen, Univ. Grenoble I

  12. Ex.: (Anti-)squark production (Anti-)quark cross section: Form factors: Squark/Gaugino Production (2)Bozzi, Fuks, Herrmann, MK, LPSC 07-023 Michael Klasen, Univ. Grenoble I

  13. Squark/Gaugino Production (3)Bozzi, Fuks, Herrmann, MK, LPSC 07-023 • a Michael Klasen, Univ. Grenoble I

  14. Motivation for light stop: Electroweak baryogenesis mstop < mtop LO calculation: bg  t1c1 Minimal Flavour Violation CTEQ6 HQ PDFs “Experimental” cut: pT > 10 GeV 4 benchmark points: ATLAS data challenge:SU1 (tanb = 10), SU6 (50) BMRV light SUSY:LS1 (tan b = 10), LS2 (50) Cross section at threshold: Associated Light Stop + Chargino ProductionBeccaria, Macorini, Panizzi, Renard, Verzegnassi, hep-ph/0610075 Michael Klasen, Univ. Grenoble I

  15. Gluino  Light Stop Decay (1)Kraml, Raklev, hep-ph/0609293 • Majorana gluino, light stop scenario: • B(g  tt1) ~ 100 % with t  bW  bln and t1  cc1 • LHC signature: • Benchmark points: • LST1: • LST2: • Fast generic LHC-detector simulation: 30 fb-1 • Experimental cuts: Michael Klasen, Univ. Grenoble I

  16. Gluino  Light Stop Decay (2)Kraml, Raklev, hep-ph/0609293 Michael Klasen, Univ. Grenoble I

  17. Light Stop Detection with ATLAS (1)Lari, Polesello, ATL-PHYS-CONF-2006-014 • Benchmark point: • Signature: • t1 bc1± bW±c10 • B(tt  bb+ll+ET) = 4.9%, B(tt  bb+l+2jets+ET) = 29 % • HERWIG(t1t1)/PYTHIA(tt)/ALPGEN(Wbb)/ATLFAST • Experimental cuts: Michael Klasen, Univ. Grenoble I

  18. Light Stop Detection with ATLAS (2)Lari, Polesello, ATL-PHYS-CONF-2006-014 Michael Klasen, Univ. Grenoble I

  19. Stop  Right-Handed Sneutrino LSP Decay (1)de Gouvea, Gopalakrishna, Porod, hep-ph/0606296 • Right-handed sneutrino LSP: • Massive n’s  right-handed n’s (see-saw, mR~100 GeV) • SUSY: right-handed sneutrinos; small YN small mixing • NLSP decay into right-handed sneutrino extremly slow • Stop NLSP: t1 ~ tR, no chargino mixing, • Benchmark point: • Signal (PYTHIA): • Background (PYTHIA): Michael Klasen, Univ. Grenoble I

  20. Stop  Right-Handed Sneutrino LSP Decay (2)de Gouvea, Gopalakrishna, Porod, hep-ph/0606296 Michael Klasen, Univ. Grenoble I

  21. Summary • FCNC Higgs decays: • Squark contributions  may be much larger than in SM • Put constraints on NMFV • Complementary to low-energy observables (b  sg) • Extensive study of squarks/gauginos in NMFV: • All squared helicity amplitudes for production and decay known • Allowed regions of NMFV parameter space  4 benchmark points • Level reordering  flavour changes  big cross section variations • (Light) stops: • Motivated by cosmology • Large production cross sections • Good identification (SS leptons, b-tagging, displaced vertices) • Can involve FCNC (t1 cc1)  sensitive to NMFV Michael Klasen, Univ. Grenoble I

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