Abstract
The angular distribution of the flavor-changing neutral current decay B$^+$ $\to$ K$^+\mu^+\mu^-$ is studied in proton-proton collisions at a center-of-mass energy of 8 TeV. The analysis is based on data collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 20.5 fb$^{-1}$. The forward-backward asymmetry $A_{\mathrm{FB}}$ of the dimuon system and the contribution $F_{\mathrm{H}}$ from the pseudoscalar, scalar, and tensor amplitudes to the decay width are measured as a function of the dimuon mass squared. The measurements are consistent with the standard model expectations.
Highlights
The decay Bþ → Kþμþμ− is a manifestation of a flavorchanging neutral current process of the type b → slþl−, with l denoting a charged lepton
Because standard model (SM) amplitudes may interfere with the contributions from beyond the SM (BSM) particles in loop diagrams, the decay can probe the presence of yet-unobserved particles and processes [4,5,6,7,8,9]
We report the measurement of AFB and FH as a function of the dimuon mass squared (q2) based on an angular fit ofptffihffi e decay Bþ → Kþμþμ− in proton-proton collisions at s 1⁄4 8 TeV
Summary
The decay Bþ → Kþμþμ− is a manifestation of a flavorchanging neutral current process of the type b → slþl−, with l denoting a charged lepton. In the standard model (SM), this decay is forbidden at tree level and occurs through higher-order processes. This makes the measurement of this process more sensitive to possible physics phenomena beyond the SM (BSM). Two independent parameters describe the decay rate for the Bþ → Kþμþμ− process: the forward-backward asymmetry AFB of the dimuon system and the contribution FH from the pseudoscalar, scalar, and tensor amplitudes to the decay width. A nonzero AFB or large FH would point to a BSM contribution [1,10], which can be probed [11,12] by comparing the experimental measurements with the theoretical predictions [6,10,13]. The angular distribution of this decay has previously been studied by the BABAR [15], Belle [16], CDF [17], and LHCb [18,19] experiments, but no hints of BSM have been seen
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