A model-independent determination of the CKM angle γ is presented, using the B^{\pm} -> [K+K-pi+pi-]Dh^{\pm} and B^{\pm} \to [pi+pi-pi+pi-]Dh^{\pm} decays, with h = K, pi. This measurement is the first phase-space binned study of these decay modes, and uses a sample of proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb-1. The phase-space bins are optimised for sensitivity to gamma, and in each bin external inputs from the BESIII experiment are used to constrain the charm strong-phase parameters. The result of this binned analysis is gamma =53.9 -8.9 +9.5 degrees, where the uncertainty includes both statistical and systematic contributions. Furthermore, when combining with existing phase-space integrated measurements of the same decay modes, a value of gamma=52.6-6.4+8.5 degrees is obtained, which is one of the most precise determinations of gamma to date.

A model-independent measurement of the CKM angle gamma in the decays B± → [K+K−π+π−]Dh± and B± → [π+π−π+π−]Dh± (h = K, π)

Kleijne N.
Membro del Collaboration Group
;
Morello M. J.
Membro del Collaboration Group
;
Passaro D.
Membro del Collaboration Group
;
Pica L.
Membro del Collaboration Group
;
Riccardi D.
Membro del Collaboration Group
;
Xu A.
Membro del Collaboration Group
;
2026

Abstract

A model-independent determination of the CKM angle γ is presented, using the B^{\pm} -> [K+K-pi+pi-]Dh^{\pm} and B^{\pm} \to [pi+pi-pi+pi-]Dh^{\pm} decays, with h = K, pi. This measurement is the first phase-space binned study of these decay modes, and uses a sample of proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb-1. The phase-space bins are optimised for sensitivity to gamma, and in each bin external inputs from the BESIII experiment are used to constrain the charm strong-phase parameters. The result of this binned analysis is gamma =53.9 -8.9 +9.5 degrees, where the uncertainty includes both statistical and systematic contributions. Furthermore, when combining with existing phase-space integrated measurements of the same decay modes, a value of gamma=52.6-6.4+8.5 degrees is obtained, which is one of the most precise determinations of gamma to date.
2026
Settore FIS/01 - Fisica Sperimentale
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
B Physics; CKM Angle Gamma; CP Violation; Hadron-Hadron Scattering
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/161264
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