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.| File | Dimensione | Formato | |
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13130_2026_Article_27944_a.pdf
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