Determining V{sub ub} from B{sup +}{r_arrow}D{sub s}{sup {asterisk}+}e{sup +}e{sup {minus}} and B{sup +}{r_arrow}D{sup {asterisk}+}e{sup +}e{sup {minus}}

Journal Article · Wed Sep 01 04:00:00 EDT 1999 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.60.057301· OSTI ID:362736

Evans, D H; Grinstein, B; Nolte, D R ^[1]

---

1. Department of Physics, University of California at San Diego, La Jolla, California 92093 (United States)

It was recently pointed out that the decays B{sup +}{r_arrow}D{sub s}{sup {asterisk}+}{gamma} and B{sup +}{r_arrow}D{sup {asterisk}+}{gamma} can be used for an extraction of {vert_bar}V{sub ub}{vert_bar}. The theory of these decays is poorly understood. It was shown that in a world of almost degenerate {ital b} and {ital c} quarks the decay would be computable. The severe difficulties that are encountered in the realistic calculation stem primarily from the very hard photon produced in the two body decay. We point out that in the decays B{sup +}{r_arrow}D{sub s}{sup {asterisk}+}e{sup +}e{sup {minus}} and B{sup +}{r_arrow}D{sup {asterisk}+}e{sup +}e{sup {minus}} the photon vertex is soft when the charmed meson is nearly at rest (in the B{sup +} rest frame). This allows us to compute with some confidence the decay rate in a restricted but interesting kinematic regime. Given enough data the extraction of V{sub ub} with reasonably small uncertainties could proceed through an analysis of these exclusive decays much as is done in the determination of V{sub cb}. {copyright} {ital 1999} {ital The American Physical Society}

• OSTI ID: 362736
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 5 Vol. 60; ISSN 0556-2821; ISSN PRVDAQ
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
B MESONS
B PLUS MESONS
D PLUS MESONS
ELECTRONS
PAIR PRODUCTION
PARTICLE DECAY
POSITRONS
SEMILEPTONIC DECAY
STANDARD MODEL