Measurement of the CKM angle γ in B^± → D(→ K⁰_{\rm S} h^′+h^′-)h^± decays with a novel approach

2026/04/07 by The BESIII, LHCb Collaborations, : +1903 · 1 voice
Physics and Astronomy · #hep-ex

paper · pdf

Abstract

A measurement of the CKM angle γ and related strong-phase parameters is performed using a novel, model-independent approach in B^±→ D(→ K⁰_{\rm S} h^′+h^′-) h^± decays, where h^(′) ≡ π, K. The analysis uses a joint data sample of electron-positron collisions collected by the BESIII experiment at the Beijing Electron-Positron Collider II during 2010--2011 and 2021--2022, corresponding to an integrated luminosity of 8 fb^-1, and proton-proton collisions collected by the LHCb experiment at the Large Hadron Collider during 2011--2018, corresponding to an integrated luminosity of 9 fb^-1. The two datasets are analyzed simultaneously by applying per-event weights based on the amplitude variation over the D-decay phase space to enhance the sensitivity to C P-violating observables. The CKM angle γ is determined to be γ= (71.3± 5.0)^∘, which constitutes the most precise single measurement to date.

Discussions

• Precise measurement of the CKM angle γ with a novel approach - A measurement of the CKM angle γ is performed by applying a novel, unbinned, model-independent approach to datasets of collected by the B [bsky, 3 points, 1 comments]

Related

• A model-independent measurement of the CKM angle γ in the decays B^±→[K⁺K^-π⁺π^-]_D h^± and B^±→[π⁺π^-π⁺π^-]_D h^± (h = K, π)
• Measurement of γ using B^±→ DK^± and B^±→ Dπ^± decays with D→ K_{\rm S}⁰π⁺π^- and D→ K_{\rm S}⁰K⁺K^-
• Measurement of CP asymmetry in B_s⁰ → D_s^∓ K^± decays
• Studies of the decay B⁰_s → D^∓_sK^±
• CKM γ measurements at LHCb