In pursuit of new physics withBsdecays
By R. Fleischer. 2000
226 citations recorded by the source corpus.
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.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/9cc5d74253ec9a2fc6a30d04aa1c0d1d66e58e33
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In Nuclear and High Energy Physics
- David M. Straub
- Andrzej Buras
- T. Hurth
- S. Descotes-Genon
- P. Paradisi
- J. Virto
- W. Altmannshofer
- M. Jung
Citations in the corpus
- First observation of the decay Bs0 → KS0K∗(892)0 at LHCb (2015, background): “The effective lifetimes of B s meson reconstructed in a particular decay depend on the CP -admixture of the final state because CP -even and CP -odd eigenstates may have different lifetimes [33].”
- Flavor Physics in the Quark Sector (2009, background): “Any sizeable deviation from this value would be unambiguous evidence of new physics [957].”
- Implications of LHCb measurements and future prospects - eScholarship (2013, methodology): “The observables φs and ∆Γs have been determined simultaneously from B 0 s → J/ψ φ decays using time-dependent flavour tagged angular analyses [222,223].”