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Collider Cross Talk
Search for pair production of heavy particles that decay to a tau and a b quark at CMS
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Europe/Zurich
4/2-011 - TH common room (CERN)
Description
A search for third generation scalar leptoquarks using events from a data sample of pp collisions corresponding to an integrated luminosity of 4.8 fb-1 , collected by the CMS detector at the LHC with sqrt(s) = 7 TeV, and containing two taus and two b jets, is presented. The number of observed events is found to be in agreement with the standard model prediction. A 95% CL limit is set on the leptoquark pair production cross section times beta^2 , where beta is the branching fraction of leptoquark to a tau and a b quark. The third generation leptoquarks with masses below 525~\GeV (for $\beta=1$) and SU(5) vector leptoquarks with masses below 760~GeV are excluded at 95\% CL. Limits are also set on the cross section for pair production of the supersymmetric partner of the top quark (stop) in R-parity violating supersymmetric scenario. Stops with masses below 453 GeV are excluded at 95% CL for a typical benchmark scenario, assuming coupling between stop, tau, and b quark, lambda'_333 = 1. Both of these results represent the most stringent mass limits on these particles to date. The stringent limits on lambda'_333 are also set excluding coupling values not ruled out by indirect bounds.
