Measurement of CP asymmetry in B[0 over s] → D[∓ over s]K[superscript ±] decays
Author(s)Counts, Ian Thomas Hunt; Ilten, Philip James; Williams, M.
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We report on measurements of the time-dependent CP violating observables in B[0 over s] → D[∓ over s]K[superscript ±] decays using a dataset corresponding to 1.0 fb[superscript −1] of pp collisions recorded with the LHCb detector. We find the CP violating observables C[subscript f] = 0.53±0.25±0.04, A[ΔΓ over f] = 0.37 ± 0.42 ± 0.20, A[ΔΓ over [bar over f] = 0.20 ± 0.41 ± 0.20, S[subscript f] = −1.09 ± 0.33 ± 0.08, S[subscript [bar over f]] = −0.36 ± 0.34 ± 0.08, where the uncertainties are statistical and systematic, respectively. Using these observables together with a recent measurement of the B[0 over s] mixing phase −2β[subscript s] leads to the first extraction of the CKM angle γ from B[0 over s] → D[∓ over s]K[superscript ±] decays, finding γ = (115[+28 over -43])° modulo 180° at 68% CL, where the error contains both statistical and systematic uncertainties.
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal of High Energy Physics
Aaij, R., B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, J. Albrecht, et al. “Measurement of CP Asymmetry in B[0 over s] → D[∓ over s]K[superscript ±] Decays.” J. High Energ. Phys. 2014, no. 11 (November 2014).
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