First measurement of the CP-violating phase in Bs(0) → ϕϕ decays.

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doi:10.1103/physrevlett.110.241802

Abstract

A first flavor-tagged measurement of the time-dependent CP-violating asymmetry in B(s)(0) → ϕϕ decays is presented. In this decay channel, the CP-violating weak phase arises due to CP violation in the interference between B(s)(0)-B(s)(0) mixing and the b → sss gluonic penguin decay amplitude. Using a sample of pp collision data corresponding to an integrated luminosity of 1.0 fb(-1) and collected at a center-of-mass energy of 7 TeV with the LHCb detector, 880 B(s)(0) → ϕϕ signal decays are obtained. The CP-violating phase is measured to be in the interval [-2.46,-0.76] rad at a 68% confidence level. The p value of the standard model prediction is 16%.

Highlights

A first flavor-tagged measurement of the time-dependent CP-violating asymmetry in B0s ! decays is presented
The interference between the B0s-B"0s oscillation and decay amplitudes leads to a CP asymmetry in the decay time distributions of B0s and B"0s mesons, which is characterized by a CP-violating weak phase
For B0s ! J=c, which proceeds via a b ! cc"s transition, the standard model (SM) prediction of the weak phase is given by À2 argðÀVtsVtÃb=VcsVcÃbÞ 1⁄4 À0:036 Æ 0:002 rad [5]

Summary

Introduction

A first flavor-tagged measurement of the time-dependent CP-violating asymmetry in B0s ! decays is presented. The interference between the B0s-B"0s oscillation and decay amplitudes leads to a CP asymmetry in the decay time distributions of B0s and B"0s mesons, which is characterized by a CP-violating weak phase. The analysis reported here improves the selection efficiency, measures the B0s decay time, and identifies the flavor of the B0s meson at production.

Results

Conclusion