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Titolo: Two photon decays of heavy vector mesons B*-> B gamma gamma, D*-> D gamma gamma, and the possible determination of the g(B)(*(D*)B(D)pi) and g(B)(*0B0 gamma) couplings - art. no. 054014
Autore: Guetta, D; Singer, P;
- Indirizzi:
- Technion Israel Inst Technol, Dept Phys, IL-32000 Haifa, Israel Technion Israel Inst Technol Haifa Israel IL-32000 L-32000 Haifa, Israel
- Titolo Testata:
- PHYSICAL REVIEW D
fascicolo: 5,
volume: 6105,
anno: 2000,
pagine: 4014 -
- SICI:
- 0556-2821(20000301)6105:5<4014:TPDOHV>2.0.ZU;2-9
- Fonte:
- ISI
- Lingua:
- ENG
- Soggetto:
- CHIRAL PERTURBATION-THEORY; D-ASTERISK-MESONS; E+E ANNIHILATIONS; RADIATIVE DECAYS; STAR-PRODUCTION; QUARK SYMMETRY; D-PI; MODEL; QCD; HADRONS;
- Tipo documento:
- Article
- Natura:
- Periodico
- Settore Disciplinare:
- Physical, Chemical & Earth Sciences
- --discip_EC--
- Citazioni:
- 54
- Recensione:
- Indirizzi per estratti:
- Indirizzo: Guetta, D Technion Israel Inst Technol, Dept Phys, IL-32000 Haifa, Israel Technion Israel Inst Technol Haifa Israel IL-32000 ifa, Israel
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- Citazione:
- D. Guetta e P. Singer, "Two photon decays of heavy vector mesons B*-> B gamma gamma, D*-> D gamma gamma, and the possible determination of the g(B)(*(D*)B(D)pi) and g(B)(*0B0 gamma) couplings - art. no. 054014", PHYS REV D, 6105(5), 2000, pp. 4014
Abstract
We study the novel decays B*-->B gamma gamma and D*-->D gamma gamma using the framework of the heavy meson chiral Lagrangian (HM chi L) to leading order in chiral perturbation theory. The branching ratios of these decays areexpressed in terms of the strong g(B*(D*)B(D)pi) and the electromagnetic g(B*(D*)B(D)gamma) couplings, thus providing a possible tool for their determination. In the charm case, using the experimentally determined ratios (D-*0,D-+ --> D pi)/(D-*0,D-+ -->D gamma), we are able to express the branching ratio as a function of the strong coupling only. We thus find 1.6 x 10(-6)<Br(D-*0--> D(0)gamma gamma)<3.3 x 10(-5) for 0.25<g< 1, where g is the strong coupling of HM chi L. In the b-flavored sector, the Br(B-*0-->B(0)gamma gamma) which we estimate to be in the 10(-7) - 10(-5) range is a functionof both g(B*B pi) and g(B*B gamma). Its behavior does not afford an unambiguous determination of these couplings except for the region of high g values such as g > 0.6. The expected two-photon differential distributions are presented for both B-*0-->B(0)gamma gamma and D-*0-->D(0)gamma gamma, for different values of the couplings involved.
ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/06/13 alle ore 06:26:00