• Open Access

Observation of D0K1(1270)e+νe

M. Ablikim et al. (BESIII Collaboration)
Phys. Rev. Lett. 127, 131801 – Published 24 September 2021

Abstract

Using 2.93fb1 of e+e collision data taken with the BESIII detector at a center-of-mass energy of 3.773 GeV, the observation of the D0K1(1270)e+νe semileptonic decay is presented. The statistical significance of the decay D0K1(1270)e+νe is greater than 10σ. The branching fraction of D0K1(1270)e+νe is measured to be (1.09±0.130.16+0.09±0.12)×103. Here, the first uncertainty is statistical, the second is systematic, and the third originates from the assumed branching fraction of K1(1270)Kπ+π. The fraction of longitudinal polarization in D0K1(1270)e+νe is determined for the first time to be 0.50±0.19stat±0.08syst.

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  • Received 22 February 2021
  • Revised 28 July 2021
  • Accepted 18 August 2021

DOI:https://doi.org/10.1103/PhysRevLett.127.131801

Published by the American Physical Society under the terms of the 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.

Published by the American Physical Society

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Vol. 127, Iss. 13 — 24 September 2021

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