Thumbnail
Access Restriction
Open

Author Jaus, W.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ B MESONS ♦ SEMILEPTONIC DECAY ♦ RADIATIVE DECAY ♦ B*-5325 MESONS ♦ D MESONS ♦ D*-2010 MESONS ♦ FORM FACTORS ♦ QUARK MODEL ♦ VECTOR DOMINANCE MODEL ♦ DUALITY ♦ COUPLING CONSTANTS ♦ MOMENTUM TRANSFER ♦ PIONS
Abstract A relativistic constituent quark model (RQM) is used to calculate the form factors for the semileptonic decays {ital B}, {ital D}{r_arrow}{pi}({rho}){ital l}{nu}, {ital B}{r_arrow}{ital D}({ital D}{sup {asterisk}}){ital l}{nu}, {ital D}{r_arrow}{ital K}({ital K}{sup {asterisk}}){ital l}{nu}, and the coupling constants for the radiative decays {ital B}{sup {asterisk}}{r_arrow}{ital B}{gamma}, {ital D}{sup {asterisk}}{r_arrow}{ital D}{gamma}. The quark model is combined with a soft pion theorem to derive the {ital B}{sup {asterisk}}{ital B}{pi} and {ital D}{sup {asterisk}}{ital D}{pi} coupling constants, which are used to calculate the rate for {ital D}{sup {asterisk}}{r_arrow}{ital D}{pi}. The parameters of the model are fixed by exploiting the duality of the vector meson dominance (VMD) picture and the picture of constituent quarks. This approach, which requires only that the predictions of the VMD model and the RQM are consistent, enables a parameter free determination of heavy quark properties, and leads to a {ital q}{sup 2} dependence of form factors which is different from the usual pole approximation. The predicted rates for {ital D} and {ital D}{sup {asterisk}} mesons agree with the data without exception. This positive result supports the conclusion that properties of heavy mesons can be analyzed consistently in this framework. {copyright} {ital 1996 The American Physical Society.}
ISSN 05562821
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-02-01
Publisher Place United States
Journal Physical Review, D
Volume Number 53
Issue Number 3


Open content in new tab

   Open content in new tab