Neutralino polarization effect in the squark cascade decay at LHC
نویسنده
چکیده
We study the effect of the neutralino polarization in a squark cascade decay q̃ → qχ̃ 2 → ql l̃ → ql l̃ → qllχ̃ 1 . Charge asymmetry in the lepton-jet invariant mass distribution appears depending on the chirality structure of the sfermion-fermion-neutralino coupling. With use of the Monte Carlo simulation, we show that the asymmetry is measurable in LHC. We also show that the distribution of the charge asymmetry is sensitive to the (s)lepton flavor.
منابع مشابه
All Possible Lightest Supersymmetric Particles in R-Parity Violating mSUGRA Models and their Signals at the LHC
We consider minimal supergravity (mSUGRA) models with an additional R-parity violating operator at the grand unification scale. This can change the supersymmetric spectrum leading on the one hand to a sneutrino, smuon or squark as the lightest supersymmetric particle (LSP). On the other hand, a wide parameter region is reopened, where the scalar tau is the LSP. It is vital to know the nature of...
متن کاملSearch for pair-produced third-generation squarks decaying via charm quarks or in compressed supersymmetric scenarios
Results of a search for supersymmetry via direct production of third-generation squarks are reported, using 20.3 fb−1 of proton-proton collision data at ffiffi s p 1⁄4 8 TeV recorded by the ATLAS experiment at the LHC in 2012. Two different analysis strategies based on monojetlike and c-tagged event selections are carried out to optimize the sensitivity for direct top squark-pair production in ...
متن کاملSearching for R-Parity Violation at Run-II of the Tevatron
We present an outlook for possible discovery of supersymmetry with broken R-parity at Run II of the Tevatron. We first present a review of the literature and an update of the experimental bounds. In turn we then discuss the following processes: 1. Resonant slepton production followed by 6 Rp decay, (a) via LQD and (b) via LLE. 2. How to distinguish resonant slepton production from Z′ or W ′ pro...
متن کاملTop polarization in stop production at the LHC
We survey the expected polarization of the top produced in the decay of a scalar top quark, t̃ → tχ̃0i , i = 1− 2. The phenomenology is quite interesting, since the expected polarization depends both on the mixing in the stop and neutralino sectors and on the mass differences between the stop and the neutralino. We find that a mixed stop behaves almost like a right-handed stop due to the larger h...
متن کاملA Measurement of Neutralino Mass at the LHC in Light Gravitino Scenarios
We consider supersymmetric (SUSY) models in which a very light gravitino is the lightest SUSY particle. Assuming that a neutralino is the next-to-lightest SUSY particle, we present a measurement of the neutralino mass at the LHC in two photons + missing energy events, which is based on the MT2 method. It is a direct measurement of the neutralino mass itself, independent of other SUSY particle m...
متن کامل