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Register a new userSearch for the rare decay $Lambda_{c}^{+} to pmu^+mu^-$
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A search for the flavor-changing neutral-current decay $Lambda_{c}^{+} to pmu^+mu^-$ is reported using a data set corresponding to an integrated luminosity of $3.0rm fb^{-1}$ collected by the LHCb collaboration. No significant signal is observed outside of the dimuon mass regions around the $phi$ and $omega$ resonances and an upper limit is placed on the branching fraction of $mathcal{B} (Lambda_{c}^{+} to pmu^+mu^-) < 7.7~(9.6)times 10^{-8}~{rm at}~90%~(95%)$ confidence level. A significant signal is observed in the $omega$ dimuon mass region for the first time.
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A search for the decay KS -> mu+ mu- is performed, based on a data sample of 1.0 fb^-1 of pp collisions at sqrt{s}=7 TeV collected by the LHCb experiment at the Large Hadron Collider. The observed number of candidates is consistent with the background-only hypothesis, yielding an upper limit of BR(KS -> mu+ mu-) < 11 (9) x 10^-9 at 95 (90)% confidence level. This limit is a factor of thirty below the previous measurement.
We study the singly-Cabibbo-suppressed decays $Lambda_c^{+}to peta$ and $Lambda_{c}^{+}to ppi^{0}$ using $Lambda_{c}^{+}Lambda_{c}^{+}$ pairs produced by $e^+e^-$ collisions at a center-of-mass energy of $sqrt{s} = 4.6; GeV$. The data sample was collected by the BESIII detector at the BEPCII collider and corresponds to an integrated luminosity of 567 $pb^{-1}$. We find the first evidence for the decay $Lambda_{c}^{+}to p eta$ with a statistical significance of $4.2sigma$ and measure its branching fraction to be $mathcal{B}(Lambda_c^+to peta)= (1.24pm0.28({rm{stat.}})pm0.10({rm{syst.}}))times10^{-3}$. No significant $Lambda_c^+ to ppi^0$ signal is observed. We set an upper limit on its branching fraction $mathcal{B}(Lambda_c^+ to ppi^{0}) < 2.7 times 10^{-4}$ at the 90% confidence level.
A search for the rare leptonic decay $B^{+} rightarrow {mu}^{+}{mu}^{-}{mu}^{+}{ u}_{{mu}}$ is performed using proton-proton collision data corresponding to an integrated luminosity of $4.7$ fb$^{-1}$ collected by the LHCb experiment. The search is carried out in the region where the lowest of the two ${mu}^{+}{mu}^{-}$ mass combinations is below $980$MeV/c$^{2}$. The data are consistent with the background-only hypothesis and an upper limit of $1.6 times 10^{-8}$ at 95% confidence level is set on the branching fraction in the stated kinematic region.
A search for the rare decay $Sigma^+ to p mu^+ mu^-$ is performed using $pp$ collision data recorded by the LHCb experiment at centre-of-mass energies $sqrt{s} = 7$ and $8$ TeV, corresponding to an integrated luminosity of $3 fb^{-1}$. An excess of events is observed with respect to the background expectation, with a signal significance of 4.1 standard deviations. No significant structure is observed in the dimuon invariant mass distribution, in contrast with a previous result from the HyperCP experiment. The measured $Sigma^+ to p mu^+ mu^-$ branching fraction is $(2.2,^{+,1.8}_{-,1.3})times 10^{-8}$, where statistical and systematic uncertainties are included, which is consistent with the Standard Model prediction.
A search for the rare decay $Sigma^+ to p mu^+ mu^-$ is performed using $pp$ collision data recorded by the LHCb experiment at centre-of-mass energies $sqrt{s} = 7$ and $8$ TeV, corresponding to an integrated luminosity of $3 fb^{-1}$. An excess of events is observed with respect to the background expectations with a signal significance of 4.0 standard deviations. No significant structure is observed in the dimuon invariant mass distribution.
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