First measurement of the differential branching fraction and CP asymmetry of the B[superscript ±] → π[superscript ± ]μ[superscript +]μ[superscript −] decay
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Author(s)
Aaij, R.
Adeva, B.
Adinolfi, M.
Affolder, A.
Ajaltouni, Z.
Akar, S.
Albrecht, J.
Alessio, F.
Alexander, M.
Ali, S.
Alternative Title
First measurement of the differential branching fraction and CP asymmetry of the B ± → π ± μ + μ − decay
Date Issued
October 2015
Journal
Journal of High Energy Physics
Publisher
Springer Berlin Heidelberg
Citation
The LHCb collaboration et al. “First Measurement of the Differential Branching Fraction and CP Asymmetry of the B[superscript ±] → π[superscript ±]μ[superscript +]μ[superscript −] Decay.” Journal of High Energy Physics 2015.10 (2015): n. pag. CrossRef. Web. 2 Dec. 2016.
Version
Final published version
Abstract
The differential branching fraction with respect to the dimuon invariant mass squared, and the CP asymmetry of the B[superscript ±] → π[superscript ±]μ[superscript +]μ[superscript −] decay are measured for the first time. The CKM matrix elements |V[subscrip td]| and |V[subscript ts]|, and the ratio |V[subscript td]/V[subscript ts]| are determined. The analysis is performed using proton-proton collision data corresponding to an integrated luminosity of 3.0 fb[superscript −1], collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The total branching fraction and CP asymmetry of B[superscript ±]→ π[superscript ±]μ[superscript +]μ[superscript −] decays are measured to be ℬ(B[superscript ±] →π[superscript ±]μ[superscript +]μ[superscript −] = (1.83±0.24±0.05)×10[superscript −8] and A[subscript CP] (B[superscript ±]→ π[superscript ±]μ[superscript +]μ[superscript −] = −0.11±0.12 ±0.01, where the first uncertainties are statistical and the second are systematic. These are the most precise measurements of these observables to date, and they are compatible with the predictions of the Standard Model.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
http://dx.doi.org/10.1007/JHEP10(2015)034
