A search for decay-time-dependent charge-parity (CP) asymmetry in D0 → K+ K− and D0 → π+ π− decays is performed at the LHCb experiment using proton-proton collision data recorded at a center-of-mass energy of 13 TeV, and corresponding to an integrated luminosity of 5.4 fb^−1. The D0 mesons are required to originate from semileptonic decays of b hadrons, such that the charge of the muon identifies the flavor of the neutral D meson at production. The asymmetries in the effective decay widths of D0 and anti-D0 mesons are determined to be A_Γ(K+ K−) = (−4.3 ± 3.6 ± 0.5) × 10^−4 and A_Γ(π+ π−) = (2.2 ± 7.0 ± 0.8) × 10^−4 , where the uncertainties are statistical and systematic, respectively. The results are consistent with CP symmetry and, when combined with previous LHCb results, yield A_Γ(K+ K−) = (−4.4 ± 2.3 ± 0.6) × 10^−4 and A_Γ(π+ π−) = (2.5 ± 4.3 ± 0.7) × 10^−4.

Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2020). Updated Measurement of Decay-Time-Dependent CP Asymmetries in D0 → K+ K− and D0 → π+ π− Decays. PHYSICAL REVIEW D, 101(1), 1-12 [10.1103/PhysRevD.101.012005].

Updated Measurement of Decay-Time-Dependent CP Asymmetries in D0 → K+ K− and D0 → π+ π− Decays

Betti, F.;Capriotti, L.;Carbone, A.;Ferrari, F.;Galli, D.;Gioventù, A.;Maccolini, S.;Manuzzi, D.;Patrignani, C.;Perazzini, S.;Pisani, F.;Vagnoni, V.;Zucchelli, S.
2020

Abstract

A search for decay-time-dependent charge-parity (CP) asymmetry in D0 → K+ K− and D0 → π+ π− decays is performed at the LHCb experiment using proton-proton collision data recorded at a center-of-mass energy of 13 TeV, and corresponding to an integrated luminosity of 5.4 fb^−1. The D0 mesons are required to originate from semileptonic decays of b hadrons, such that the charge of the muon identifies the flavor of the neutral D meson at production. The asymmetries in the effective decay widths of D0 and anti-D0 mesons are determined to be A_Γ(K+ K−) = (−4.3 ± 3.6 ± 0.5) × 10^−4 and A_Γ(π+ π−) = (2.2 ± 7.0 ± 0.8) × 10^−4 , where the uncertainties are statistical and systematic, respectively. The results are consistent with CP symmetry and, when combined with previous LHCb results, yield A_Γ(K+ K−) = (−4.4 ± 2.3 ± 0.6) × 10^−4 and A_Γ(π+ π−) = (2.5 ± 4.3 ± 0.7) × 10^−4.
2020
Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2020). Updated Measurement of Decay-Time-Dependent CP Asymmetries in D0 → K+ K− and D0 → π+ π− Decays. PHYSICAL REVIEW D, 101(1), 1-12 [10.1103/PhysRevD.101.012005].
Aaij, R.; Abellán Beteta, C.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Aidala, C.A.; Aiola, S.; Ajaltouni, Z.; Akar, S.; Albicocco, P.; ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/720631
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