Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Inclusive dileptonic rare B decays with an extra generation of vectorlike quarks - art. no. 054011
Autore:
Ahmady, MR; Nagashima, M; Sugamoto, A;
Indirizzi:
Ochanomizu Univ, Dept Phys, Bunkyo Ku, Tokyo 112, Japan Ochanomizu Univ Tokyo Japan 112 , Dept Phys, Bunkyo Ku, Tokyo 112, Japan
Titolo Testata:
PHYSICAL REVIEW D
fascicolo: 5, volume: 6405, anno: 2001,
pagine: 4011 -
SICI:
0556-2821(20010901)6405:5<4011:IDRBDW>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
CHANGING NEUTRAL CURRENTS; CP ASYMMETRIES; MODEL; VIOLATION; B->XSE+E;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Ahmady, MR Mt Allison Univ, Dept Phys, Sackville, NB E0A 3C0, Canada Mt Allison Univ Sackville NB Canada E0A 3C0 NB E0A 3C0, Canada
Citazione:
M.R. Ahmady et al., "Inclusive dileptonic rare B decays with an extra generation of vectorlike quarks - art. no. 054011", PHYS REV D, 6405(5), 2001, pp. 4011

Abstract

We investigate the leading effects of extending the standard model of electroweak interactions by an extra isosinglet up- and down-type quark pair onvarious distributions and total branching ratio of the inclusive B --> X(s)l(+) l(-) (l = e, mu) rare B decays. The presence of the extra vectorlike down quark D results in the nonunitarity of the extended quark mixing matrix V, which in turn leads to b --> s flavor changing neutral currents at thetree level proportional to (V+V)(sb). On the other hand, the effective penguin and box vertex functions are sensitive to the mass of the extra isosinglet up quark m(U). The experimental upper bound on BR(B --> X(s)mu (+) mu (-)) is used to constrain the parameters of the model. It is shown that theshapes of the differential branching ratio and forward-backward asymmetry distribution are very sensitive to the value of the model parameters. We also calculate the CP aymmetry distribution of the dileptonic decay in the vectorlike quark model. It is shown that, for a typical choice of the model parameters, asymmetrics up to around 10% can be achieved for certain values of the dilepton invariant mass.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/01/20 alle ore 06:31:33