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Titolo:
Looking for novel CP-violating effects in (B)over-bar -> K*l(+)l(-) - art.no. 014013
Autore:
Kruger, F; Lunghi, E;
Indirizzi:
Inst Super Tecn, Dept Fis, CFIF, P-1049001 Lisbon, Portugal Inst Super Tecn Lisbon Portugal P-1049001 IF, P-1049001 Lisbon, Portugal SISSA, ISAS, I-34013 Trieste, Italy SISSA Trieste Italy I-34013SISSA, ISAS, I-34013 Trieste, Italy Ist Nazl Fis Nucl, Sez Trieste, Trieste, Italy Ist Nazl Fis Nucl TriesteItaly l Fis Nucl, Sez Trieste, Trieste, Italy
Titolo Testata:
PHYSICAL REVIEW D
fascicolo: 1, volume: 6301, anno: 2001,
pagine: 4013 -
SICI:
0556-2821(20010101)6301:1<4013:LFNCEI>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
RARE-B-DECAYS; LEADING LOGARITHMS; V-UB; PHYSICS; B->X(S)L(+)L(-); FACTORIZATION; POLARIZATION; ASYMMETRIES; MESONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Kruger, F Inst Super Tecn, Dept Fis, CFIF, Av Rovisco Pais, P-1049001 Lisbon, Portugal Inst Super Tecn Av Rovisco Pais Lisbon Portugal P-1049001 tugal
Citazione:
F. Kruger e E. Lunghi, "Looking for novel CP-violating effects in (B)over-bar -> K*l(+)l(-) - art.no. 014013", PHYS REV D, 6301(1), 2001, pp. 4013

Abstract

The CP-violating asymmetries in the exclusive decay (B) over bar -K*l(+)l(-) (l = e, mu, tau) are predicted to be exceedingly small in the standard model (SM), thereby offering an opportunity to assess various new-physics scenarios. We derive quantitative predictions for various integrated observables in (B) over bar -K*mu (+)mu (-) decay in the presence of physics beyondthe SM with additional CP phases and an extended operator basis. In particular, a model-independent analysis of CP asymmetries that require the presence of unitarity phases, in addition to CP violation, is performed. We findthat in the low dimuon invariant mass region 2m(mu)less than or equal toM(mu+mu-)<M-N<phi>, the CP asymmetries are highly suppressed by small dynamical phases, assuming that new physics is unlikely to significantly alter theWilson coefficients of the operators governing two-body hadronic B decays. Taking into account current experimental data on the measured b-->s gamma rate and the upper limit on B(B-o-->K*(o)mu (+)mu (-)), CP-violating effects of a few percent are estimated, even in the presence of new physics with Cr phases of O(1). By contrast, in the high dimuon invariant mass region M-psi<M<mu>+mu- less than or equal to (M-B-M-K*) significant CP-violating effects are possible. Given a branching ratio of 1.8 x 10(-6), the CP asymmetries can be quite substantial (similar to 20% or more), and thus may serve as a means of discovering physics transcending the SM.

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Documento generato il 22/01/20 alle ore 12:42:32