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Measurement of the Absolute Branching Fraction for Lambda(+)(c) -> Lambda e(+)nu(e)
Journal article   Open access   Peer reviewed

Measurement of the Absolute Branching Fraction for Lambda(+)(c) -> Lambda e(+)nu(e)

M. Ablikim, M. N. Achasov, X. C. Ai, O. Albayrak, M. Albrecht, D. J. Ambrose, A. Amoroso, F. F. An, Q. An, J. Z. Bai, …
Physical review letters, v 115(22), pp 221805-221805
25 Nov 2015
DOI: https://doi.org/10.1103/PhysRevLett.115.221805
PMID: 26650293
url
https://link.aps.org/accepted/10.1103/PhysRevLett.115.221805View
Published, Version of Record (VoR) Open
url
https://doi.org/10.1103/PhysRevLett.115.221805View
Published, Version of Record (VoR) Open

Abstract

Physical Sciences Physics Physics, Multidisciplinary Science & Technology
We report the first measurement of the absolute branching fraction for Lambda(+)(c) -> Lambda e(+)nu(e). This measurement is based on 567 pb(-1) of e(+)e(-) annihilation data produced at root s = 4.599 GeV, which is just above the Lambda(+)(c)Lambda(-)(c) threshold. The data were collected with the BESIII detector at the BEPCII storage rings. The branching fraction is determined to be B(Lambda(+)(c) -> Lambda e(+)nu(e)) = [3.63 +/- 0.38(stat) +/- 0.20(syst)] %, representing a significant improvement in precision over the current indirect determination. As the branching fraction for Lambda(+)(c) -> Lambda e(+)nu(e) is the benchmark for those of other Lambda(+)(c) semileptonic channels, our result provides a unique test of different theoretical models, which is the most stringent to date.

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Physics, Multidisciplinary
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