Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-12-18
Phys.Rev. D63 (2001) 114015
Physics
High Energy Physics
High Energy Physics - Phenomenology
minor changes, lattice prediction of Delta Gamma updated, appears in PRD
Scientific paper
10.1103/PhysRevD.63.114015
The presence of a sizeable CP-violating phase in B_s^0-B_s^0-bar mixing would be an unambiguous signal of physics beyond the Standard Model. We analyse various possibilities to detect such a new phase considering both tagged and untagged decays. The effects of a sizeable width difference Delta Gamma between the B_s mass eigenstates, on which the untagged analyses rely, are included in all formulae. A novel method to find this phase from simple measurements of lifetimes and branching ratios in untagged decays is proposed. This method does not involve two-exponential fits, which require much larger statistics. For the tagged decays, an outstanding role is played by the observables of the time-dependent angular distribution of the B_s -> J/psi [-> l^+ l^-] \phi [-> K^+K^-] decay products. We list the formulae needed for the angular analysis in the presence of both a new CP-violating phase and a sizeable Delta Gamma, and propose methods to remove a remaining discrete ambiguity in the new phase. This phase can therefore be determined in an unambiguous way.
Dunietz Isard
Fleischer Robert
Nierste Ulrich
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