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  4. Evidence for semileptonic B- -> p(p)over-barl(-)(nu)over-bar(l) decays
 
research article

Evidence for semileptonic B- -> p(p)over-barl(-)(nu)over-bar(l) decays

Tien, K. -J.
•
Wang, M. -Z.
•
Adachi, I.
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2014
Physical Review D [1970-2015]

We find evidence for the semileptonic baryonic decay B- -> p (p) over barl(-)(nu) over bar (l) (l = e, mu), based on a data sample of 772 million B (B) over bar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy electron-positron collider. A neural-network based hadronic B-meson tagging method is used in this study. The branching fraction of B- -> p (p) over barl(-)(nu) over bar (l) is measured to be (5.8(-2.1)(+2.4)(stat) +/- 0.9(syst)) x 10(-6) with a significance of 3.2 sigma s, where lepton universality is assumed. We also estimate the corresponding upper limit: B(B- -> p (p) over barl(-)(nu) over bar (l)) < 9.6 x 10(-6) at the 90% confidence level. This measurement helps constrain the baryonic transition form factor in B decays.

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Type
research article
DOI
10.1103/PhysRevD.89.011101
Web of Science ID

WOS:000331841100001

Author(s)
Tien, K. -J.
Wang, M. -Z.
Adachi, I.
Aihara, H.
Asner, D. M.
Aulchenko, V.
Aushev, T.
Bakich, A. M.
Bala, A.
Bhuyan, B.
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Corporate authors
Belle Collaboration
Date Issued

2014

Publisher

American Physical Society

Published in
Physical Review D [1970-2015]
Volume

89

Issue

1

Article Number

011101(R)

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LPHE  
Available on Infoscience
April 2, 2014
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/102476
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