First Experimental Study of the Purely Leptonic Decay Ds∗+ →e+νe

BESIII Collaboration; N. Kalantar-Nayestanaki; R. Kappert; M. Kavatsyuk; J. Messchendorp; V. Rodin

doi:10.1103/PhysRevLett.131.141802

First Experimental Study of the Purely Leptonic Decay Ds∗+ →e+νe

BESIII Collaboration, N. Kalantar-Nayestanaki, R. Kappert, M. Kavatsyuk, J. Messchendorp, V. Rodin

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Abstract

Using 7.33 fb-1 of e+e- collision data taken with the BESIII detector at the BEPCII collider, we report the first experimental study of the purely leptonic decay Ds∗+→e+νe. Our data contain a signal of this decay with a statistical significance of 2.9σ. The branching fraction of Ds∗+→e+νe is measured to be (2.1-0.9stat+1.2±0.2syst)×10-5, corresponding to an upper limit of 4.0×10-5 at the 90% confidence level. Taking the total width of the Ds∗+ [(0.070±0.028) keV] predicted with the radiative Ds∗+ decay from the lattice QCD calculation as input, the decay constant of the Ds∗+ is determined to be fDs∗+=(214-46stat+61±44syst) MeV, corresponding to an upper limit of 354 MeV at the 90% confidence level.

Original language	English
Article number	141802
Number of pages	9
Journal	Physical Review Letters
Volume	131
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevLett.131.141802
Publication status	Published - 6-Oct-2023

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title = "First Experimental Study of the Purely Leptonic Decay Ds∗+ →e+νe",

abstract = "Using 7.33 fb-1 of e+e- collision data taken with the BESIII detector at the BEPCII collider, we report the first experimental study of the purely leptonic decay Ds∗+→e+νe. Our data contain a signal of this decay with a statistical significance of 2.9σ. The branching fraction of Ds∗+→e+νe is measured to be (2.1-0.9stat+1.2±0.2syst)×10-5, corresponding to an upper limit of 4.0×10-5 at the 90% confidence level. Taking the total width of the Ds∗+ [(0.070±0.028) keV] predicted with the radiative Ds∗+ decay from the lattice QCD calculation as input, the decay constant of the Ds∗+ is determined to be fDs∗+=(214-46stat+61±44syst) MeV, corresponding to an upper limit of 354 MeV at the 90% confidence level.",

author = "{BESIII Collaboration} and M. Ablikim and Achasov, {M. N.} and N. Kalantar-Nayestanaki and R. Kappert and M. Kavatsyuk and J. Messchendorp and V. Rodin",

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T1 - First Experimental Study of the Purely Leptonic Decay Ds∗+ →e+νe

AU - BESIII Collaboration

AU - Ablikim, M.

AU - Achasov, M. N.

AU - Kalantar-Nayestanaki, N.

AU - Kappert, R.

AU - Kavatsyuk, M.

AU - Messchendorp, J.

AU - Rodin, V.

N1 - Publisher Copyright: © 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.

PY - 2023/10/6

Y1 - 2023/10/6

N2 - Using 7.33 fb-1 of e+e- collision data taken with the BESIII detector at the BEPCII collider, we report the first experimental study of the purely leptonic decay Ds∗+→e+νe. Our data contain a signal of this decay with a statistical significance of 2.9σ. The branching fraction of Ds∗+→e+νe is measured to be (2.1-0.9stat+1.2±0.2syst)×10-5, corresponding to an upper limit of 4.0×10-5 at the 90% confidence level. Taking the total width of the Ds∗+ [(0.070±0.028) keV] predicted with the radiative Ds∗+ decay from the lattice QCD calculation as input, the decay constant of the Ds∗+ is determined to be fDs∗+=(214-46stat+61±44syst) MeV, corresponding to an upper limit of 354 MeV at the 90% confidence level.

AB - Using 7.33 fb-1 of e+e- collision data taken with the BESIII detector at the BEPCII collider, we report the first experimental study of the purely leptonic decay Ds∗+→e+νe. Our data contain a signal of this decay with a statistical significance of 2.9σ. The branching fraction of Ds∗+→e+νe is measured to be (2.1-0.9stat+1.2±0.2syst)×10-5, corresponding to an upper limit of 4.0×10-5 at the 90% confidence level. Taking the total width of the Ds∗+ [(0.070±0.028) keV] predicted with the radiative Ds∗+ decay from the lattice QCD calculation as input, the decay constant of the Ds∗+ is determined to be fDs∗+=(214-46stat+61±44syst) MeV, corresponding to an upper limit of 354 MeV at the 90% confidence level.

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VL - 131

JO - Physical Review Letters

JF - Physical Review Letters

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First Experimental Study of the Purely Leptonic Decay Ds∗+ →e+νe

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