TY - JOUR
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.
UR - http://www.scopus.com/inward/record.url?scp=85175053964&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.131.141802
DO - 10.1103/PhysRevLett.131.141802
M3 - Article
SN - 0031-9007
VL - 131
JO - Physical Review Letters
JF - Physical Review Letters
IS - 14
M1 - 141802
ER -