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Measurement of branching fractions of Λc+ηΛπ+, ηΣ0π+, Λ(1670)π+, and ηΣ(1385)+

J. Y. Lee et al. (Belle Collaboration)
Phys. Rev. D 103, 052005 – Published 15 March 2021

Abstract

We report branching fraction measurements of four decay modes of the Λc+ baryon, each of which includes an η meson and a Λ baryon in the final state, and all of which are measured relative to the Λc+pKπ+ decay mode. The results are based on a 980fb1 data sample collected by the Belle detector at the KEKB asymmetric-energy e+e collider. Two decays, Λc+ηΣ0π+ and Λ(1670)π+, are observed for the first time, while the measurements of the other decay modes, Λc+ηΛπ+ and ηΣ(1385)+, are more precise than those made previously. We obtain relative branching fractions of B(Λc+ηΛπ+)/B(Λc+pKπ+)=0.293±0.003±0.014, B(Λc+ηΣ0π+)/B(Λc+pKπ+)=0.120±0.006±0.010, B(Λc+Λ(1670)π+)×B(Λ(1670)ηΛ)/B(Λc+pKπ+)=(5.54±0.29±0.73)×102, and B(Λc+ηΣ(1385)+)/B(Λc+pKπ+)=0.192±0.006±0.016. The mass and width of the Λ(1670) are also precisely determined to be 1674.3±0.8±4.9MeV/c2 and 36.1±2.4±4.8MeV, respectively, where the uncertainties are statistical and systematic, respectively.

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  • Received 26 August 2020
  • Accepted 28 January 2021

DOI:https://doi.org/10.1103/PhysRevD.103.052005

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. 103, Iss. 5 — 1 March 2021

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