EPJ Web of Conferences 28, 12032 (2012)
https://doi.org/10.1051/epjconf/20122812032

Search for CP violation in B⁰ → J/ψK_S⁰ decays with first LHCb data

Universidade Federal do Rio de Janeiro

^a e-mail: rangel@if.ufrj.br

Abstract

We report a measurement of the CP violation in B⁰ → J/ψK_S⁰ decays. We perform a time-dependent analysis of the decays reconstructed in 35 pb⁻¹ of LHCb data that was taken in 2010. We measure the CP asymmetry parameter S_J/ψKS⁰ = 0.53_-0.29^+0.28 (stat) ±0.05 (syst), which is connected to the CKM angle β.