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Search for baryon number violation in top-quark decays

The CMS collaboration
Phys.Lett. B731 (2014) 173-196, 2014

Abstract (data abstract)
CERN-LHC. A search for baryon number violation (BNV) in top-quark decays is performed using pp collisions produced in 2012 by the LHC at sqrt(s) = 8 TeV. The top-quark decay considered in this search results in one light lepton (muon or electron), two jets, but no neutrino in the final state. Data used for the analysis were collected by the CMS detector and correspond to an integrated luminosity of 19.5 inverse femtobarns. The event selection is optimized for top quarks produced in pairs, with one having the BNV decay and the other the standard model hadronic decay to three jets. No significant excess of events over the expected yield from standard model processes is observed. The upper limits at 95% confidence level on the branching fraction of the BNV top-quark decay are calculated to be 0.0016 and 0.0017 for the muon and the electron channels, respectively. Update (08 JAN 2014): slight changes to uncertainties for tW process and expected limits.

  • Table 1

    Data from Table 1

    10.17182/hepdata.62206.v1/t1

    Muon channel: expected and observed yields in the tight selections for an assumed BNV decay branching fraction of zero. The...

  • Table 2

    Data from Table 2

    10.17182/hepdata.62206.v1/t2

    Electron channel: expected and observed yields in the tight selections for an assumed BNV decay branching fraction of zero. The...

  • Table 3

    Data from Table 6

    10.17182/hepdata.62206.v1/t3

    Expected and observed 95% CL upper limits on the BNV decay branching fraction.

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