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T: Fachverband Teilchenphysik
T 15: Flavorphysik (Theorie) 2
T 15.8: Vortrag
Mittwoch, 11. März 2009, 18:30–18:45, M001
Precision Physics with Bs0→ J/ψ φ at the LHC:
The Quest for New Physics — •Sven Faller1, Thomas Mannel1, and Robert Fleischer2 — 1Theoretische Physik 1, Fachbereich Physik, Universität Siegen — 2Theory Division, Department of Physics, CERN, CH-1211 Geneva 23, Switzerland
CP-violating effects in the time-dependent angular distribution of the Bs0→ J/ψ[→ℓ+ℓ−]φ[→ K+K−] decay products play a key rôle 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 Bs0–Bs0 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 Bs0→ J/ψ[→ℓ+ℓ−]K*0[→ π+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).