Prospects for observing CP violation and rare decays at ATLAS and CMS

TL;DR

This paper discusses the potential of ATLAS and CMS experiments at the LHC to observe CP violation and rare B-meson decays, focusing on di-muon signatures and their implications for testing beyond Standard Model physics.

Contribution

It provides an analysis of the expected sensitivity of ATLAS and CMS to rare B-decays and CP violation measurements after three years of LHC data collection.

Findings

Both experiments can measure Bs→μμ decay with 3σ significance at SM predicted rates.

High-precision tests of BSM effects in CP violation are feasible with di-muon signatures.

Statistical dominance of B→J/ψ(μμ) decays enables detailed B-physics analyses.

Abstract

Model (BSM). ATLAS and CMS concentrate on B decays that can be registered by a di-muon signature. B-hadrons decaying to J/psi(mumu) will statistically dominate B-physics analyses allowing high precision measurements, in particular a test of BSM effects in the CP violation of Bs-Jpsiphi. In the so-called rare B-decay sector, ATLAS and CMS will concentrate on a family of semi-muonic exclusive channels, b - s mumu and on the purely muonic decay Bs - mumu. After three years of LHC running at a luminosity of a few times 1033 cm-2 s-1 (corresponding to 30 fb-1), each of these two experiments can measure the Bs-mumu signal with 3 sigma significance, assuming the Standard Model (SM) value for the decay probability.