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First branching fraction measurement of the suppressed decay Ξc0πΛc+

R. Aaij et al. (LHCb Collaboration)
Phys. Rev. D 102, 071101(R) – Published 12 October 2020

Abstract

The Ξc0 baryon is unstable and usually decays into charmless final states by the csud¯ transition. It can, however, also disintegrate into a π meson and a Λc+ baryon via s quark decay or via csdc weak scattering. The interplay between the latter two processes governs the size of the branching fraction B(Ξc0πΛc+), first measured here to be (0.55±0.02±0.18)%, where the first uncertainty is statistical and second systematic. This result is compatible with the larger of the theoretical predictions that connect models of hyperon decays using partially conserved axial currents and SU(3) symmetry with those involving the heavy-quark expansion and heavy-quark symmetry. In addition, the branching fraction of the normalization channel, B(Ξc+pKπ+)=(1.135±0.002±0.387)% is measured.

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  • Received 23 July 2020
  • Accepted 11 September 2020

DOI:https://doi.org/10.1103/PhysRevD.102.071101

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.

© 2020 CERN, for the LHCb Collaboration

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Vol. 102, Iss. 7 — 1 October 2020

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