Measurement of the charm-mixing parameter y_CP

2018/10/31 by LHCb collaboration, R. Aaij, C. Abellán Beteta +841 · 1 citation
Physics and Astronomy · #hep-ex

paper · pdf · doi:10.1103/physrevlett.122.011802

published as Phys. Rev. Lett. 122, 011802 (2019) · All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2018-038.html

arxiv created 2019/01/09 · arxiv updated 2019/01/16

Abstract

A measurement of the charm-mixing parameter y_CP using D⁰ → K⁺ K^-, D⁰ → π⁺ π^-, and D⁰ → K^- π⁺ decays is reported. The D⁰ mesons are required to originate from semimuonic decays of B^- and B⁰ mesons. These decays are partially reconstructed in a data set of proton-proton collisions at center-of-mass energies of 7 and 8 TeV collected with the LHCb experiment and corresponding to an integrated luminosity of 3 fb^-1. The y_CP parameter is measured to be (0.57 ± 0.13(\rmstat.) ± 0.09(\rmsyst.))%, in agreement with, and as precise as, the current world-average value.

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