Precision Physics with B0s -> J/psi phi at the LHC: The Quest for New Physics
Abstract
CP-violating effects in the time-dependent angular distribution of the B0s -> J/psi[-> ell+ ell-] phi[-> K+K-] decay products play a key role for the search of new physics. The hadronic Standard-Model uncertainties are related to doubly Cabibbo-suppressed penguin contributions and are usually assumed to be negligibly small. In view of recent results from the Tevatron and the quickly approaching start of the data taking at the LHC, we have a critical look at the impact of these terms, which could be enhanced through long-distance QCD phenomena, and explore the associated uncertainty for the measurement of the CP-violating B0s- B0s mixing phase. We point out that these effects can actually be controlled by means of an analysis of the time-dependent angular distribution of the B0s -> J/psi[-> ell+ ell-] K*0[-> pi+ K-] decay products, and illustrate this through numerical studies. Moreover, we discuss SU(3)-breaking effects, which limit the theoretical accuracy of our method, and suggest internal consistency checks of SU(3).