A measurement of CP-violating observables in B± → D*K± and B± → D*π± decays is made where the photon or neutral pion from the D* → Dγ or D* → Dπ0 decay is not reconstructed. The D meson is reconstructed in the self-conjugate decay modes, D → π+π− or D → K+K−. The distribution of signal yields in the D decay phase space is analysed in a model-independent way. The measurement uses a data sample collected in proton-proton collisions at centre-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of approximately 9 fb−1. The B± → D*K± and B± → D*π± CP-violating observables are interpreted in terms of hadronic parameters and the CKM angle γ, resulting in a measurement of γ = ( )°. The total uncertainty includes the statistical and systematic uncertainties, and the uncertainty due to external strong-phase inputs.

Null, N., Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinén, F., Ackernley, T., et al. (2024). A model-independent measurement of the CKM angle γ in partially reconstructed B± → D*h± decays with D → h+h− (h = π, K). JOURNAL OF HIGH ENERGY PHYSICS, 2024(2) [10.1007/jhep02(2024)118].

A model-independent measurement of the CKM angle γ in partially reconstructed B± → D*h± decays with D → h+h− (h = π, K)

Anelli, A.;Borsato, M.;Calvi, M.;Capelli, S.;Carniti, P.;Fazzini, D.;García Pardiñas, J.;Gotti, C.;Kirsebom, V. S.;Martinazzoli, L.;Martinelli, M.;Minotti, A.;Pizzichemi, M.;Salomoni, M.;Shields, E. B.;
2024

Abstract

A measurement of CP-violating observables in B± → D*K± and B± → D*π± decays is made where the photon or neutral pion from the D* → Dγ or D* → Dπ0 decay is not reconstructed. The D meson is reconstructed in the self-conjugate decay modes, D → π+π− or D → K+K−. The distribution of signal yields in the D decay phase space is analysed in a model-independent way. The measurement uses a data sample collected in proton-proton collisions at centre-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of approximately 9 fb−1. The B± → D*K± and B± → D*π± CP-violating observables are interpreted in terms of hadronic parameters and the CKM angle γ, resulting in a measurement of γ = ( )°. The total uncertainty includes the statistical and systematic uncertainties, and the uncertainty due to external strong-phase inputs.
Articolo in rivista - Articolo scientifico
B Physics; CKM Angle Gamma; CP Violation; Hadron-Hadron Scattering
English
16-feb-2024
2024
2024
2
118
open
Null, N., Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinén, F., Ackernley, T., et al. (2024). A model-independent measurement of the CKM angle γ in partially reconstructed B± → D*h± decays with D → h+h− (h = π, K). JOURNAL OF HIGH ENERGY PHYSICS, 2024(2) [10.1007/jhep02(2024)118].
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