Measurement of the CKM angle $\gamma$ in $B^{\pm }\to D{K}^{\ast }(892{)}^{\pm }$ decays

Abstract

Measurements of $CP$ observables and the CKM angle $\gamma$ are performed in $B^{\pm }\to D{K}^{\ast }(892{)}^{\pm }$ decays, where $D$ represents a superposition of $D^0$ and $\overline{D}{}^0$ states, using the LHCb dataset collected during Run 1 (2011-2012) and Run 2 (2015-2018). A study of this channel is presented with the $D$ meson reconstructed in two-body final states $K^{\pm }{\pi }^{\mp }$, $K^{+}{K}^{-}$ and ${\pi }^{+}{\pi }^{-}$; four-body final states $K^{\pm }{\pi }^{\mp }{\pi }^{\pm }{\pi }^{\mp }$ and ${\pi }^{+}{\pi }^{-}{\pi }^{+}{\pi }^{-}$; and three-body final states $K_S^0{\pi }^{+}{\pi }^{-}$ and $K_S^0{K}^{+}{K}^{-}$. This analysis includes the first observation of the suppressed $B^{\pm }\to [{\pi }^{\pm }{K}^{\mp }{]}_D{K}^{\ast \pm }$ and $B^{\pm }\to [{\pi }^{\pm }{K}^{\mp }{\pi }^{\pm }{\pi }^{\mp }{]}_D{K}^{\ast \pm }$ decays. The combined result gives $\gamma =(63\pm 13{)}^{\circ }$.

arXiv commentAll figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://lbfence.cern.ch/alcm/public/analysis/full-details/3180/ (LHCb public pages)

References in corpus (12)

• A Brief Introduction to PYTHIA 8.1
• A Unified Approach to the Classical Statistical Analysis of Small Signals
• 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
• Performance of the LHCb Outer Tracker
• Current status of the Standard Model CKM fit and constraints on $\Delta F=2$ New Physics
• Selection and processing of calibration samples to measure the particle identification performance of the LHCb experiment in Run 2
• Improved performance of the LHCb Outer Tracker in LHC Run 2
• RapidSim: an application for the fast simulation of heavy-quark hadron decays
• First determination of the CP content of D->pi+pi-pi0 and D->K+K-pi0

Cited by in corpus (1)

• Towards replacing detector simulation with heterogeneous GNNs in flavour physics analyses