Measurement of the B-meson inclusive semileptonic branching fraction and electron energy moments

We report a new measurement of the B-meson semileptonic decay momentum spectrum that has been made with a sample of 9.4/fb of electron-positron annihilation data collected with the CLEO II detector at the Y(4S) resonance. Electrons from primary semileptonic decays and secondary charm decays were separated by using charge and angular correlations in Y(4S) events with a high-momentum lepton and an additional electron. We determined the semileptonic branching fraction to be (10.91 +- 0.09 +- 0.24)% from the normalization of the electron-energy spectrum. We also measured the moments of the electron energy spectrum with minimum energies from 0.6 GeV to 1.5 GeV.

Note:

Back-to-back with preceding preprint hep-ex/0403052

13.20.He
14.40.Nd
12.15.Ff
electron positron: colliding beams
electron positron: annihilation
Upsilon(10570): electroproduction
B: pair production
B: semileptonic decay
B: branching ratio
lepton: particle identification

References(39)

Figures(0)

The Baffling semileptonic branching ratio of B mesons

Ikaros I.Y. Bigi
(
- CERN and
- Notre Dame U.
)
,
Boris Blok
(
- Technion
)
,
Mikhail A. Shifman
(
- Minnesota U.
)
,
Arkady I. Vainshtein
(
- Minnesota U.
)

- Phys.Lett.B 323 (1994) 408-416
•
e-Print:
- hep-ph/9311339
•
DOI:
- 10.1016/0370-2693(94)91239-4

A Model independent determination of the inclusive semileptonic decay fraction of B mesons

ARGUS

Collaboration

•

H. Albrecht
(
- DESY and
- DESY, Zeuthen
)

et al.

- Phys.Lett.B 318 (1993) 397-404
•
DOI:
- 10.1016/0370-2693(93)90146-9

Measurements of the B semileptonic branching fraction with lepton tags

CLEO

Collaboration

•

B. Barish
(
- Caltech
)

et al.

- Phys.Rev.Lett. 76 (1996) 1570-1574
•
DOI:
- 10.1103/PhysRevLett.76.1570

Measurement of the branching fraction for inclusive semileptonic $B$ meson decays

BaBar

Collaboration

•

Bernard Aubert
(
- Annecy, LAPP
)

et al.

- Phys.Rev.D 67 (2003) 031101
•
e-Print:
- hep-ex/0208018
•
DOI:
- 10.1103/PhysRevD.67.031101

Measurement of the inclusive semileptonic branching fraction of B mesons and |V(cb)|

Belle

Collaboration

•

Kazuo Abe
(
- KEK, Tsukuba
)

et al.

- Phys.Lett.B 547 (2002) 181-192
•
e-Print:
- hep-ex/0208033
•
DOI:
- 10.1016/S0370-2693(02)02770-3

Preasymptotic Effects in Inclusive Weak Decays of Charmed Particles

Mikhail A. Shifman
(
- Moscow, ITEP
)
,
M.B. Voloshin
(
- Moscow, ITEP
)

- Sov.J.Nucl.Phys. 41 (1985) 120,
- Yad.Fiz. 41 (1985) 187-198

Lepton energy distributions in heavy meson decays from QCD

- Phys.Lett.B 247 (1990) 399-405
•
DOI:
- 10.1016/0370-2693(90)90916-T

Nonperturbative corrections to inclusive beauty and charm decays: QCD versus phenomenological models

Ikaros I.Y. Bigi
(
- Notre Dame U.
)
,
N.G. Uraltsev
(
- Notre Dame U. and
- St. Petersburg, INP
)
,
A.I. Vainshtein
(
- Minnesota U. and
- Novosibirsk, IYF
)

- Phys.Lett.B 293 (1992) 430-436,
- Phys.Lett.B 297 (1992) 477-477 (erratum)
•
e-Print:
- hep-ph/9207214
•
DOI:
- 10.1016/0370-2693(92)90908-M

Nonperturbative corrections to inclusive beauty and charm decays: QCD versus phenomenological models

Ikaros I.Y. Bigi
(
- Notre Dame U.
)
,
N.G. Uraltsev
(
- Notre Dame U. and
- St. Petersburg, INP
)
,
A.I. Vainshtein
(
- Minnesota U. and
- Novosibirsk, IYF
)

- Phys.Lett.B 293 (1992) 430-436,
- Phys.Lett.B 297 (1992) 477-477 (erratum)
•
e-Print:
- hep-ph/9207214
•
DOI:
- 10.1016/0370-2693(92)90908-M

QCD predictions for lepton spectra in inclusive heavy flavor decays

Ikaros I.Y. Bigi
(
- Notre Dame U.
)
,
Mikhail A. Shifman
(
- Minnesota U.
)
,
N.G. Uraltsev
(
- Notre Dame U. and
- St. Petersburg, INP
)
,
Arkady I. Vainshtein
(
- Minnesota U. and
- Novosibirsk, IYF
)

- Phys.Rev.Lett. 71 (1993) 496-499,
•
e-Print:
- hep-ph/9304225
•
DOI:
- 10.1103/PhysRevLett.71.496

$O(\alpha_s)$ calculation of the decays $b \to s + \gamma$ and $b \to s + g$

K. Adel
(
- Michigan U.
)
,
York-Peng Yao
(
- Michigan U. and
- Taiwan, Inst. Phys.
)

- Phys.Rev.D 49 (1994) 4945-4948,
- Phys. Rev. D49 (1994) 4945-4948. and Michigan Univ. Ann Arbor - UM-TH-93-20 (93/08,rec.Oct.) 12 p. and Taipei Inst. Phys. Acad. Sin. - IP-ASTP-93-29 (93/08,rec.Oct.) 12 p
•
e-Print:
- hep-ph/9308349
•
DOI:
- 10.1103/PhysRevD.49.4945