A model-independent measurement of the CKM angle $\gamma$ in partially reconstructed $B^{\pm }\to D^{\ast }{h}^{\pm }$ decays with $D\to K_S^0{h}^{+}{h}^{-}$ $(h=\pi ,K)$

Abstract

A measurement of $CP$-violating observables in $B^{\pm }\to D^{\ast }{K}^{\pm }$ and $B^{\pm }\to D^{\ast }{\pi }^{\pm }$ decays is made where the photon or neutral pion from the $D^{\ast }\to D\gamma$ or $D^{\ast }\to D{\pi }^0$ decay is not reconstructed. The $D$ meson is reconstructed in the self-conjugate decay modes, $D\to K_S^0{\pi }^{+}{\pi }^{-}$ or $D\to K_S^0{K}^{+}{K}^{-}$. 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 $B^{\pm }\to D^{\ast }{K}^{\pm }$ and $B^{\pm }\to D^{\ast }{\pi }^{\pm }$ $CP$-violating observables are interpreted in terms of hadronic parameters and the CKM angle $\gamma$, resulting in a measurement of $\gamma =(92_{-17}^{+21}{)}^{\circ }$. The total uncertainty includes the statistical and systematic uncertainties, and the uncertainty due to external strong-phase inputs.

arXiv commentAll figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2023-029.html (LHCb public pages)

References in corpus (20)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• A Brief Introduction to PYTHIA 8.1
• LHCb Detector Performance
• Decay Chain Fitting with a Kalman Filter
• Determining $\gamma$ using $B^{\pm }\to D{K}^{\pm }$ with multibody D decays
• Efficient, reliable and fast high-level triggering using a bonsai boosted decision tree
• The ultimate theoretical error on gamma from B -> D K decays
• Feasibility study of model-independent approach to phi_3 measurement using Dalitz plot analysis
• RapidSim: an application for the fast simulation of heavy-quark hadron decays
• The use of quantum-correlated D^0 decays for phi3 measurement
• ReDecay: A novel approach to speed up the simulation at LHCb
• Model-independent bounds on new physics effects in non-leptonic tree-level decays of B-mesons
• New physics effects in tree-level decays
• Laura++ : a Dalitz plot fitter
• On ${\varphi }_3$ Measurements Using $B^{-}\to D^{\ast }{K}^{-}$ Decays
• Charm mixing in the model-independent analysis of correlated D0-D0bar decays
• Emerging $\Delta M_d$-Anomaly from Tree-Level Determinations of $|V_{cb}|$ and the Angle $\gamma$
• Study of the sensitivity to CKM angle $\gamma$ under simultaneous determination from multiple $B$ meson decay modes
• CP violation and material interaction of neutral kaons in measurements of the CKM angle $\gamma$ using $B^{\pm }\to D{K}^{\pm }$ decays where $D\to K_{\text{S}}^0{\pi }^{+}{\pi }^{-}$