Abstract
AbstractThe angular distribution and differential branching fraction of the decayB+→K+μ+μ−are studied with a dataset corresponding to 1.0fb−1of integrated luminosity, collected by the LHCb experiment. The angular distribution is measured in bins of dimuon invariant mass squared and found to be consistent with Standard Model expectations. Integrating the differential branching fraction over the full dimuon invariant mass range yields a total branching fraction of$ \mathcal{B} $(B+→K+μ+μ−) = (4.36±0.15±0.18)×10−7. These measurements are the most precise to date of theB+→K+μ+μ−decay.
Highlights
Experimental setupThe LHCb detector [13] is a single-arm forward spectrometer, covering the pseudorapidity range 2 < η < 5, that is designed to study b and c hadron decays
The relative decay rate of B+ → K+μ+μ− to B0 → K0μ+μ− has previously been studied by the LHCb collaboration in the context of a measurement of the isospin asymmetry [12]
This paper presents a measurement of the differential branching fraction, FH and AFB of the decay B+ → K+μ+μ− in seven bins of q2 and a measurement of the total branching fraction
Summary
The LHCb detector [13] is a single-arm forward spectrometer, covering the pseudorapidity range 2 < η < 5, that is designed to study b and c hadron decays. A silicon micro-strip detector, located around the pp interation region, provides excellent separation of B meson decay vertices from the primary pp interaction and an impact parameter resolution of 20 μm for tracks with high transverse momentum (pT). The simulated pp interactions are generated using Pythia 6.4 [14] with a specific LHCb configuration [15]. Decays of hadronic particles are described by EvtGen [16] in which final state radiation is generated using Photos [17]. The Geant toolkit [18, 19] is used to simulate the detector response to the particles produced by Pythia/EvtGen, as described in ref. The simulated samples are corrected for differences between data and simulation in the B+ momentum spectrum, the detector impact parameter resolution, particle identification and tracking system performance
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