report from the squark subgroup
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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 - PowerPoint PPT PresentationTRANSCRIPT
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Report from the Squark Subgroup
Michael KlasenUniversity of Grenoble I
26 March 2007
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26 March 2007 Michael Klasen, Univ. Grenoble I 2
721 Contributions
SUSY Higgs bosons:SUSY H production and FCNC decaySUSY H bs decay and B-physics complementarity
Squark/gaugino production and decayAll NMFV amplitudes, phenomenology for 3rd gen. production
Top squark production and decay:Associated light stop + chargino productionGluino light stop decayLight stop detection with ATLASStop searches with CMS (not received)Stop right-handed sneutrino LSP decay
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26 March 2007 Michael Klasen, Univ. Grenoble I 3
2433 ParticipantsM. 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)
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26 March 2007 Michael Klasen, Univ. Grenoble I 4
SUSY Higgs ProductionBejar, Guasch, Sola, hep-ph/0508043
Cross section: HIGLU 2.101 and PPHTT 1.1Leading order onlyRunning mq and s
Default scalesCTEQ4L PDFs
Scan MSSM for max:
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26 March 2007 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 : leading mt, mb tan approximation
Constraints on :B(bs) = (2.1 - 4.5) 10-4 (3), same sign as in SM
SUSY-QCD contribution:
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26 March 2007 Michael Klasen, Univ. Grenoble I 6
SUSY Higgs Decays (2)Bejar, Guasch, Sola, hep-ph/0508043
h bs [ ] h tc
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26 March 2007 Michael Klasen, Univ. Grenoble I 7
SUSY Higgs Decays (3)Hahn, Hollik, Illana, Penaranda, hep-ph/0512315
B(H0, A0 bs):FeynArts/FormCalc/LoopTsAll 1-loop SM/SUSY cont.s
B(b s):NMFV operators:
NLO QCD [Kagan, Neubert]1-loop SUSY contributions
MSSM scenario:
Disfavored by b s
Allowed by b s
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26 March 2007 Michael Klasen, Univ. Grenoble I 8
SUSY Higgs Decays (4)Hahn, Hollik, Illana, Penaranda, hep-ph/0512315
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26 March 2007 Michael Klasen, Univ. Grenoble I 9
Scans of NMFV Parameter SpaceBozzi, Fuks, Herrmann, MK, LPSC 07-023
Theoretical constraints: ,
Experimental constraints (2):Low energy (FeynHiggs):
[ >0]Dark matter (DarkSUSY):
mSUGRA plane (m1/2 vs. m0): tan = 10, 30, 50
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26 March 2007 Michael Klasen, Univ. Grenoble I 10
Proposal of 4 NMFV Benchmark PointsBozzi, Fuks, Herrmann, MK, LPSC 07-023
4 collider-friendly NMFV benchmark points:
-dependence of exp. constraints (point B):
Flavour-decomposition of lighter squarks:
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26 March 2007 Michael Klasen, Univ. Grenoble I 11
Squark/Gaugino Production (1)Bozzi, Fuks, Herrmann, MK, LPSC 07-023
Squark mass matrix:
Squared helicity amplitudes:
Gauge boson couplings:
Gluino coupling:
Gaugino couplings:
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26 March 2007 Michael Klasen, Univ. Grenoble I 12
Squark/Gaugino Production (2)Bozzi, Fuks, Herrmann, MK, LPSC 07-023
Ex.: (Anti-)squark production
(Anti-)quark cross section:
Form factors:
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26 March 2007 Michael Klasen, Univ. Grenoble I 13
Squark/Gaugino Production (3)Bozzi, Fuks, Herrmann, MK, LPSC 07-023
a
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26 March 2007 Michael Klasen, Univ. Grenoble I 14
Associated Light Stop + Chargino Production
Beccaria, Macorini, Panizzi, Renard, Verzegnassi, hep-ph/0610075
Motivation for light stop:Electroweak baryogenesismstop < mtop
LO calculation:bg t11
Minimal Flavour ViolationCTEQ6 HQ PDFs
“Experimental” cut:pT > 10 GeV
4 benchmark points:ATLAS data challenge:SU1 (tan= 10), SU6 (50)BMRV light SUSY:LS1 (tan = 10), LS2 (50)
Cross section at threshold:
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26 March 2007 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 bl and t1 c1
LHC signature:
Benchmark points:LST1:LST2:
Fast generic LHC-detector simulation: 30 fb-1
Experimental cuts:
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26 March 2007 Michael Klasen, Univ. Grenoble I 16
Gluino Light Stop Decay (2)Kraml, Raklev, hep-ph/0609293
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26 March 2007 Michael Klasen, Univ. Grenoble I 17
Light Stop Detection with ATLAS (1)Lari, Polesello, ATL-PHYS-CONF-2006-014
Benchmark point:
Signature:t1 b1
± bW±10
B(tt bb+ll+ET) = 4.9%, B(tt bb+l+2jets+ET) = 29 %
HERWIG(t1t1)/PYTHIA(tt)/ALPGEN(Wbb)/ATLFASTExperimental cuts:
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26 March 2007 Michael Klasen, Univ. Grenoble I 18
Light Stop Detection with ATLAS (2)Lari, Polesello, ATL-PHYS-CONF-2006-014
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26 March 2007 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 ’s right-handed ’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):
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26 March 2007 Michael Klasen, Univ. Grenoble I 20
Stop Right-Handed Sneutrino LSP Decay (2)
de Gouvea, Gopalakrishna, Porod, hep-ph/0606296
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26 March 2007 Michael Klasen, Univ. Grenoble I 21
SummaryFCNC Higgs decays:
Squark contributions may be much larger than in SMPut constraints on NMFVComplementary to low-energy observables (b s)
Extensive study of squarks/gauginos in NMFV:All squared helicity amplitudes for production and decay knownAllowed regions of NMFV parameter space 4 benchmark pointsLevel reordering flavour changes big cross section variations
(Light) stops:Motivated by cosmologyLarge production cross sectionsGood identification (SS leptons, b-tagging, displaced vertices) Can involve FCNC (t1 c1) sensitive to NMFV