Determination of gamma and -2beta_s from charmless two-body decays of beauty mesons

Abstract

Using the latest LHCb measurements of time-dependent CP violation in the B^0_s -> K^+K^- decay, a U-spin relation between the decay amplitudes of B^0_s -> K^+K^- and B^0 -> π^+π^- decay processes allows constraints to be placed on the angle gamma of the unitarity triangle and on the B^0_s mixing phase -2β_s. Results from an extended approach, which uses additional inputs on B^0 -> π^0π^0 and B^+ -> π^+π^0 decays from other experiments and exploits isospin symmetry, are also presented. The dependence of the results on the maximum allowed amount of U-spin breaking is studied. At 68% probability, the value γ= ( 63.5 +7.2 -6.7 ) degrees modulo 180 degrees is determined. In an alternative analysis, the value -2β_s = -0.12 +0.14 -0.16 rad is found. In both measurements, the uncertainties due to U-spin breaking effects up to 50% are included.

updated to v2 with minor changes after journal review

References in corpus (12)

• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2016
• Branching Ratio Measurements of $B_s$ Decays
• Measurement of CP Asymmetries and Branching Fractions in Charmless Two-Body B-Meson Decays to Pions and Kaons
• B, Bs -> K form factors: an update of light-cone sum rule results
• $B_{s,d}\to \pi \pi ,\pi K,KK$: Status and Prospects
• Measurements of Direct CP Violating Asymmetries in Charmless Decays of Strange Bottom Mesons and Bottom Baryons
• Observation of direct CP violation in the measurement of the Cabibbo-Kobayashi-Maskawa angle gamma with B+- --> D(*)K(*)+- decays
• Testing the Standard Model and searching for New Physics with $B_d\to \pi \pi$ and $B_s\to KK$ decays
• Effective lifetime measurements in the $B_s^0\to K^{+}{K}^{-}$, $B^0\to K^{+}{\pi }^{-}$ and $B_s^0\to {\pi }^{+}{K}^{-}$ decays
• U-Spin Tests of the Standard Model and New Physics
• Penguin pollution estimates relevant for phi_2/alpha extraction
• ANAIS: Status and prospects

Cited by in corpus (11)

• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2016
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2018
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2021
• Universal Unitarity Triangle 2016 and the Tension Between $\Delta M_{s,d}$ and ${\epsilon }_K$ in CMFV Models
• Towards New Frontiers in the Exploration of Charmless Non-Leptonic $B$ Decays
• Measurement of $CP$ asymmetries in two-body $B_{(s)}^0$-meson decays to charged pions and kaons
• CP violation in the B system
• New Strategy to Explore CP Violation with $B_s^0\to K^{-}{K}^{+}$
• Theoretical Prospects for B Physics
• Constrain the UT angle $\gamma$ by CP violation parameters in $B^0\to {\pi }^{+}{\pi }^{-}$
• CP violation measurements in b hadrons at LHCb