Measurement of inclusive charmless semileptonic B-meson decays at the endpoint of the electron momentum spectrum

Limosani, A.; Abe, K.; Adachi, I.; Aihara, H.; Asano, Y.; Aushev, T.; Bahinipati, S.; Bakich, A.M.; Barberio, E.; Bitenc, U.

doi:10.1016/j.physletb.2005.06.011

Measurement of inclusive charmless semileptonic B-meson decays at the endpoint of the electron momentum spectrum

Belle

Collaboration

Apr, 2005

21 pages

Published in:

Phys.Lett.B 621 (2005) 28-40

e-Print:

hep-ex/0504046 [hep-ex]

DOI:

10.1016/j.physletb.2005.06.011

PDG:

{{\mathit B}}

\rightarrow

{{\mathit X}_{{{u}}}}{{\mathit \ell}^{+}}{{\mathit \nu}_{{{{{\mathit \ell}}}}}}

Report number:

BELLE-PREPRINT-2005-18,
KEK-PREPRINT-2005-15

Experiments:

KEK-BF-BELLE

View in:

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Abstract:

We report measurements of partial branching fractions of inclusive charmless semileptonic

B

-meson decays at the endpoint of the electron momentum spectrum. The measurements are made in six overlapping momentum intervals that have lower bounds ranging from 1.9 GeV/

c

to 2.4 GeV/

c

and a common upper bound of 2.6 GeV/

c

, as measured in the centre of mass frame. The results are based on a sample of 29 million

B\bar{B}

pairs, accumulated by the Belle detector at the KEKB asymmetric

e^+e^-

collider operating on the

\Upsilon(4S)

resonance. In the momentum interval ranging from 1.9 GeV/

c

to 2.6 GeV/

c

we measure the partial branching fraction

\Delta \mathcal{B}(B\to X_u e \nu_e)=(8.47 \pm 0.37 \pm 1.53)\times 10^{-4}

, where the first error is statistical and the second is systematic. A prediction of the partial rate

R=(21.69 \pm 3.62^{+ 2.18}_{- 1.98}) |V_{ub}|^2 \mathrm{ps}^{-1}

in this momentum interval based on theory is calculated with input HQET parameters that have been derived from Belle's measurement of the

B\to X_s\gamma

photon energy spectrum, where the first error is due to the uncertainty on HQET parameters and the second error is from theory. Using both

\Delta \mathcal{B}(B\to X_u e \nu_e)

and

R

we find

|V_{ub}|=(5.08 \pm 0.47 \pm 0.42^{+ 0.26}_{- 0.23})\times 10^{-3}

, where the first error is from the partial branching fraction, and the second and third errors are from uncertainties in

R

.

12.15.Ff
14.40.Nd
11.30.Er
13.20.He
Semileptonic B-meson decays
CKM matrix
Semileptonic B -meson decays
electron positron: colliding beams
electron positron: annihilation
Upsilon(10570): electroproduction

References(44)

Figures(0)

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