Measurement of the Absolute Branching Fraction for Λc+ → Λe+νe

(BESIII Collaboration)

doi:10.1103/PhysRevLett.115.221805

Measurement of the Absolute Branching Fraction for Λc+ → Λe+νe

(BESIII Collaboration)

Risultato della ricerca: Contributo su rivista › Articolo in rivista › peer review

Abstract

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

Lingua originale	Inglese
Numero di articolo	221805
Rivista	Physical Review Letters
Volume	115
Numero di pubblicazione	22
DOI	https://doi.org/10.1103/PhysRevLett.115.221805
Stato di pubblicazione	Pubblicato - 25 nov 2015
Pubblicato esternamente	Sì

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10.1103/PhysRevLett.115.221805

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@article{a230581970024efeaf8ce39b8a23ce9f,

title = "Measurement of the Absolute Branching Fraction for Λc+ → Λe+νe",

abstract = "We report the first measurement of the absolute branching fraction for Λc+→Λe+νe. This measurement is based on 567 pb-1 of e+e- annihilation data produced at s=4.599 GeV, which is just above the Λc+Λ¯c- threshold. The data were collected with the BESIII detector at the BEPCII storage rings. The branching fraction is determined to be B(Λc+→Λe+νe)=[3.63±0.38(stat)±0.20(syst)]\%, representing a significant improvement in precision over the current indirect determination. As the branching fraction for Λc+→Λe+νe is the benchmark for those of other Λc+ semileptonic channels, our result provides a unique test of different theoretical models, which is the most stringent to date.",

author = "\{(BESIII Collaboration)\} and M. Ablikim and Achasov, \{M. N.\} and Ai, \{X. C.\} and O. Albayrak and M. Albrecht and Ambrose, \{D. J.\} and A. Amoroso and An, \{F. F.\} and Q. An and Bai, \{J. Z.\} and \{Baldini Ferroli\}, R. and Y. Ban and Bennett, \{D. W.\} and Bennett, \{J. V.\} and M. Bertani and D. Bettoni and Bian, \{J. M.\} and F. Bianchi and E. Boger and I. Boyko and Briere, \{R. A.\} and H. Cai and X. Cai and O. Cakir and A. Calcaterra and Cao, \{G. F.\} and Cetin, \{S. A.\} and Chang, \{J. F.\} and G. Chelkov and G. Chen and Chen, \{H. S.\} and Chen, \{H. Y.\} and Chen, \{J. C.\} and Chen, \{M. L.\} and Chen, \{S. J.\} and X. Chen and Chen, \{X. R.\} and Chen, \{Y. B.\} and Cheng, \{H. P.\} and Chu, \{X. K.\} and G. Cibinetto and Dai, \{H. L.\} and Dai, \{J. P.\} and A. Dbeyssi and D. Dedovich and Deng, \{Z. Y.\} and A. Denig and I. Denysenko and M. Destefanis and \{De Mori\}, F.",

note = "Publisher Copyright: {\textcopyright} 2015 American Physical Society.",

year = "2015",

month = nov,

day = "25",

doi = "10.1103/PhysRevLett.115.221805",

language = "English",

volume = "115",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "22",

}

TY - JOUR

T1 - Measurement of the Absolute Branching Fraction for Λc+ → Λe+νe

AU - (BESIII Collaboration)

AU - Ablikim, M.

AU - Achasov, M. N.

AU - Ai, X. C.

AU - Albayrak, O.

AU - Albrecht, M.

AU - Ambrose, D. J.

AU - Amoroso, A.

AU - An, F. F.

AU - An, Q.

AU - Bai, J. Z.

AU - Baldini Ferroli, R.

AU - Ban, Y.

AU - Bennett, D. W.

AU - Bennett, J. V.

AU - Bertani, M.

AU - Bettoni, D.

AU - Bian, J. M.

AU - Bianchi, F.

AU - Boger, E.

AU - Boyko, I.

AU - Briere, R. A.

AU - Cai, H.

AU - Cai, X.

AU - Cakir, O.

AU - Calcaterra, A.

AU - Cao, G. F.

AU - Cetin, S. A.

AU - Chang, J. F.

AU - Chelkov, G.

AU - Chen, G.

AU - Chen, H. S.

AU - Chen, H. Y.

AU - Chen, J. C.

AU - Chen, M. L.

AU - Chen, S. J.

AU - Chen, X.

AU - Chen, X. R.

AU - Chen, Y. B.

AU - Cheng, H. P.

AU - Chu, X. K.

AU - Cibinetto, G.

AU - Dai, H. L.

AU - Dai, J. P.

AU - Dbeyssi, A.

AU - Dedovich, D.

AU - Deng, Z. Y.

AU - Denig, A.

AU - Denysenko, I.

AU - Destefanis, M.

AU - De Mori, F.

PY - 2015/11/25

Y1 - 2015/11/25

N2 - We report the first measurement of the absolute branching fraction for Λc+→Λe+νe. This measurement is based on 567 pb-1 of e+e- annihilation data produced at s=4.599 GeV, which is just above the Λc+Λ¯c- threshold. The data were collected with the BESIII detector at the BEPCII storage rings. The branching fraction is determined to be B(Λc+→Λe+νe)=[3.63±0.38(stat)±0.20(syst)]%, representing a significant improvement in precision over the current indirect determination. As the branching fraction for Λc+→Λe+νe is the benchmark for those of other Λc+ semileptonic channels, our result provides a unique test of different theoretical models, which is the most stringent to date.

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

UR - https://www.scopus.com/pages/publications/84949676188

U2 - 10.1103/PhysRevLett.115.221805

DO - 10.1103/PhysRevLett.115.221805

M3 - Article

SN - 0031-9007

VL - 115

JO - Physical Review Letters

JF - Physical Review Letters

IS - 22

M1 - 221805

ER -

Measurement of the Absolute Branching Fraction for Λc+ → Λe+νe

Abstract

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