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Search for third generation leptoquarks in tau+b
A search for third generation leptoquarks and stops using events from a data sample of pp collisions corresponding to an integrated luminosity of 4.8~\fbinv, collected by the CMS detector at the LHC with $\sqrt{s}=7$~\TeV is presented. The number of observed events containing two taus and two b jets...
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Publicado: |
2012
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Materias: | |
Acceso en línea: | http://cds.cern.ch/record/1460842 |
Sumario: | A search for third generation leptoquarks and stops
using events from a data sample of pp collisions corresponding to an integrated luminosity of 4.8~\fbinv, collected
by the CMS detector at the LHC with $\sqrt{s}=7$~\TeV is presented.
The number of observed events containing two taus and two b jets is found to be in
agreement with the standard model prediction. A 95\% CL limit is set
on the scalar (vector) 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, $\lambda^{\prime}_{333}=1$.
Both of these results represent the most stringent mass limits
on these particles to date.
The stringent limits on $\lambda^{\prime}_{333}$ are also set excluding coupling values not ruled out by indirect bounds. |
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