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Measurement of the B {r_arrow} D scr(l){nu} Branching Fractions and Form Factor

Journal Article · · Physical Review Letters
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  1. Vanderbilt University, Nashville, Tennessee 37235 (United States)
  2. Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061 (United States)
  3. Wayne State University, Detroit, Michigan 48202 (United States)
  4. California Institute of Technology, Pasadena, California 91125 (United States)
  5. University of California, San Diego, La Jolla, California 92093 (United States)
  6. University of California, Santa Barbara, California 93106 (United States)
  7. University of Colorado, Boulder, Colorado 80309-0390 (United States)
  8. Cornell University, Ithaca, New York 14853 (United States)
  9. University of Florida, Gainesville, Florida 32611 (United States)
  10. Harvard University (United States)
+ Show Author Affiliations

Using a sample of 3.3{times}10{sup 6} B -meson decays collected with the CLEO detector at the Cornell Electron Storage Ring, we have studied B{sup {minus}}{r_arrow}D{sup 0}{ell}{sup {minus}}{bar {nu}} and {bar B}{sup 0}{r_arrow}D{sup +} {ell}{sup {minus}}{bar {nu}} decays, where {ell}{sup {minus}} can be either e{sup {minus}} or {mu}{sup {minus}} . We distinguish B{r_arrow}D{ell}{nu} from other B semileptonic decays by examining the net momentum and energy of the particles recoiling against D{minus}{ell} pairs. We find {Gamma}(B{r_arrow}D{ell}{nu})=(14.1{plus_minus} 1.0{plus_minus}1.2) ns{sup {minus}1} and derive branching fractions for B{sup {minus}}{r_arrow}D{sup 0}{ell}{sup {minus}}{bar {nu}} and {bar B}{sup 0}{r_arrow}D{sup +} {ell}{sup {minus}}{bar {nu}} of (2.32{plus_minus}0.17{plus_minus}0.20){percent} and (2.20{plus_minus}0.16{plus_minus}0.19){percent} , respectively, where the uncertainties are statistical and systematic. We also investigate the B{r_arrow}D{ell}{nu} form factor and the implication of the result for {vert_bar}V{sub cb}{vert_bar} . {copyright} {ital 1999} {ital The American Physical Society}

OSTI ID:
348257
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 19 Vol. 82; ISSN 0031-9007; ISSN PRLTAO
Country of Publication:
United States
Language:
English

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Related Subjects

66 PHYSICS
B MESONS
BRANCHING RATIO
CESR STORAGE RING
D MESONS
FORM FACTORS
NEUTRINOS
SEMILEPTONIC DECAY
STORAGE RINGS