Inclusive and exclusive semileptonic decays of B mesons to D mesons

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1991

OSTI ID:5317579

Crawford, G D

Using the CLEO detector at the Cornell Electron Storage Ring (CESR), the author has made the first measurements of the exclusive semileptonic branching fractions of B{sup {minus}} mesons to the charmed final states D{sup 0} and D{sup {asterisk}0}. He has confirmed the observation of the decay {bar B}{sup 0} {yields} D{sup +}{ell}{sup {minus}}{bar {nu}} and has measured the branching fraction. These results yield the ratio of vector to pseudoscalar widths {Gamma}{sub SL}(D{sup {asterisk}})/{Gamma}{sub SL}(D) = 2.6{sub {minus}0.6}{sup +1.1}{sub {minus}0.8}{sup +1.0}. Further, he finds the lifetime ratio for charged to neutral B mesons {tau}(B{sup {minus}})/{tau}(B{sup 0}) to be (0.89 {plus minus} 0.19 {plus minus} 0.13) (f00/F+{minus}). Using theoretical models, he extracts a measurement of the KM matrix element {vert bar}{sub cb}{vert bar} = 0.040 {plus minus} 0.006 {plus minus} 0.003 {plus minus} 0.004. He also finds that the sum of the exclusive semileptonic branching fractions to pseudoscalar and vector meson final states only accounts for (64 {plus minus} 10)% of the total semileptonic branching fraction to charmed final states.

• Research Organization: Cornell Univ., Ithaca, NY (United States)
• OSTI ID: 5317579
• Country of Publication: United States
• Language: English

Related Subjects

662350* -- Decays of Mesons-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B MESONS
B MINUS MESONS
B NEUTRAL MESONS
BARYONS
BEAUTY PARTICLES
BOSONS
BRANCHING RATIO
CESR STORAGE RING
CHARM PARTICLES
CHARMED MESONS
D MESONS
D NEUTRAL MESONS
DECAY
DISTRIBUTION
ELEMENTARY PARTICLES
EXCLUSIVE INTERACTIONS
FERMIONS
FIELD THEORIES
FINAL-STATE INTERACTIONS
HADRONS
INCLUSIVE INTERACTIONS
INTERACTIONS
KOBAYASHI-MASKAWA MATRIX
LIFETIME
MATRICES
MESONS
PARTICLE DECAY
PARTICLE INTERACTIONS
PSEUDOSCALAR MESONS
SEMILEPTONIC DECAY
STORAGE RINGS
UNIFIED-FIELD THEORIES
WEAK PARTICLE DECAY