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0건의 후기보기KPS(한국물리학회) 포스터 프리젠테이션 준비를 위해서 만든 자료입니다. R-Parity Stop이 tau와 b로 붕괴되는 것을 결과에서 플랏을 통해서 exclude 시켜야 되는지를 보여주는 것이 결론입니다.
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1장 Introduction
2장 Analysis
3장 Conclusion
search for pair production of
rpv scalar top quarks and 3rd generation leptoquarks decaying to a tau lepton and a b quark with cms detector
eunmi choi
xxxx. xx
xx. 1 contents introduction analysis conclusion 2 rpv susy supersymmetry a possible extension of the standard model
sm particle is associated with a superpartner,
whose spin differs by a half-integer.
3 rp (-1)3bl2s rp 1 ; sm particles, rp-1 ; susy particles r-parity conservation(rpc)
: susy particles → sm particles susy particles.
r-parity violation(rpv) : susy particles → sm particles general superpotential : wwmssmwrpv
(b : baryon number, l : lepton number, s : spin)
pair production and decay of stop and lq3 pair production of stop search for stop in rpv stop → tau b search for 3rd generation leptoquark(lq3) lq3 → tau b 4 wrpv lijkliljek l’ijkliqjdk l’’ijkuidjdk ← lepton violation comparisons between stop and lq3
production cross-section(using prospino2) and all kinematic distributions(using pythia) are consistent
→ application for same analysis framework 5 cross section
kinematical distributions (leptons, tau, and two b quark)
st scalar sum of pt (l hadronic tau 2 bjets) 6
branching ratios for stop decay via rpv with various θ and tanβ values.
the branching ratio decreases after around 300 gev when the rp conserving stop → neutralinos or charginos are kinematically allowed.
branching ratios for rpv stop decay br is insensitive to tanβ analysis data and mc samples event selection and background estimation
result : exclusion limitsonmassesof stop, lq3, vlq3
7 data and mc samples data samples
integrated luminosity 4.8 fb-1 in 7 tev collision
trigger : lepton(electron or muon) plus tau cross trigger
mc background samples ttbar, single top, w/zjets, dibosons, qcd
ttbar is the major background.
signal mc samples production using pythia mass [xxxx.xx.xx] gev with 50 gev step
nlo cross-sections using prospino2 and 15~28% pdf uncertainties.
8 ② pre-selection : lepton and tau lepton and tau selection pt(l)> 20 gev-electron, muon pt(τ)> 30 gev-hps(hadron plus strips) tau dominant background : z(jets in both channels (이하 생략)
