Impact of squark generation mixing on the search for squarks and gluinos at LHC

Details Impact of squark generation mixing on the search for squarks and gluinos at LHC Impact of squark generation mixing on the search for squarks and gluinos at LHC

2010-11-22

arxiv.org/abs/1011.4839v2

Proceedings of the 35th International Conference of High Energy Physics, PoS(ICHEP 2010)395

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 3 figures, Proceedings of the 35th International Conference of High Energy Physics (ICHEP2010), Paris, France, July 2

Scientific paper

We study the effect of squark-generation mixing on production and decays of squarks and gluinos at LHC in the Minimal Supersymmetric Standard Model (MSSM). We show that the mixing effects can be very large in a significant range of the squark-generation mixing parameters despite the very strong constraints on quark-flavour violation (QFV) from experimental data on B mesons. We find that under favourable conditions the QFV decay branching ratio B(gluino -> c bar{t} (t bar{c}) neutralino_1) can be as large as about 50%, which may lead to significant QFV signals at LHC. We also find that the squark generation mixing can result in a novel multiple-edge (3- or 4-edge) structure in the charm-top quark invariant mass distribution. Further we show that the two lightest up-type squarks ~u_{1,2} can have very large branching ratios for the decays ~u_i -> c neutralino_1 and ~u_i -> t neutralino_1 simultaneously due to the mixing effect, resulting in QFV signals 'pp -> c bar{t} (t bar{c}) + missing-E_T + X' at a significant rate at LHC. These remarkable signatures could provide a powerful test of supersymmetric QFV at LHC and could have an important impact on the search for squarks and gluinos and the determination of the MSSM parameters at LHC.

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