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Physical Review D
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Physical Review D
Article . 2001 . Peer-reviewed
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https://doi.org/10.48550/arxiv...
Article . 2000
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In pursuit of new physics with $B_s$ decays

Authors: Dunietz, Isard; Fleischer, Robert; Nierste, Ulrich;

In pursuit of new physics with $B_s$ decays

Abstract

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^-] ��[-> 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.

minor changes, lattice prediction of Delta Gamma updated, appears in PRD

Country
Germany
Keywords

width: difference, FOS: Physical sciences, bibliography, B/s0: width, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), B/s0: decay modes, B/s0: hadronic decay, CP: violation, time dependence, B/s0 anti-B/s0: interference, info:eu-repo/classification/ddc/530, B/s0: branching ratio

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
185
Top 10%
Top 1%
Top 10%
Green
bronze
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