LHCb's sensitivity to New CP-violating Phases in the Decay $B_s \to \phi\phi$

This note describes the selection of the Bs->phi(KK)phi(KK) decay channel in LHCb experiment using data produced in Monte Carlo simulation. We expect about 3.1 k signal events in 2 fb^-1 of data with an upper limit on the background to signal ratio, B/S < 0.8 at 90% CL. We also present the sensitivity of this channel to new physics. There are two approaches to test the Standard Model (SM) using this channel: measure the CP asymmetries in a model-independent way and compare them with their SM predictions; or simply assume the SM is valid, measure the total weak phase based on the SM and compare the measurement with the SM prediction. We adopt the latter for this study. The total weak phase can be measured to a statistical precision of 0.11 in 2 fb^-1 of data and 0.05 in 10 fb^-1 of data. This channel thereffore provides a good opportunity to search for physics beyond the SM with new CP-violating phases.