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



Aaij, R, Abdelmotteleb, ASW, Beteta, C Abellan, Abudinen, F, Ackernley, T, Adefisoye, AA, Adeva, B, Adinolfi, M, Adlarson, P, Agapopoulou, C
et al (show 1170 more authors) (2026) A model-independent measurement of the CKM angle γ in the decays B± [K+K-π+π-]Dh± and B± [π+π-π+π-]Dh± (h = K, π) JOURNAL OF HIGH ENERGY PHYSICS, 2026 (1). 62-. ISSN 1126-6708, 1029-8479

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Abstract

A model-independent determination of the CKM angle γ is presented, using the B± → [K+Kπ+π]<inf>D</inf>h± and B± → [π+ππ+π]<inf>D</inf>h± decays, with h = K, π. 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 γ, 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 γ=53.9−8.9+9.5°, 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 γ=52.6−6.4+8.5° is obtained, which is one of the most precise determinations of γ to date.

Item Type: Article
Uncontrolled Keywords: B Physics, CKM Angle Gamma, CP Violation, Hadron-Hadron Scattering
Divisions: Faculty of Science & Engineering
Faculty of Science & Engineering > School of Engineering
Faculty of Science & Engineering > School of Physical Sciences
Faculty of Science & Engineering > School of Physical Sciences > Physics
Faculty of Science & Engineering > School of Engineering > Civil and Environmental Engineering
Depositing User: Symplectic Admin
Date Deposited: 23 Jan 2026 10:00
Last Modified: 16 Jun 2026 20:26
DOI: 10.1007/JHEP01(2026)062
Open Access URL: https://link.springer.com/content/pdf/10.1007/JHEP...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3196690
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