Letter
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Charm-baryon semileptonic decays and the strange $Λ^{*}$ resonances: New insights from lattice QCD

¹Department of Physics, University of Arizona, Tucson, Arizona 85721, USA
²Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA

Phys. Rev. D 105, L051505 – Published 25 March, 2022

DOI: https://doi.org/10.1103/PhysRevD.105.L051505

Abstract

Understanding the properties of the strange $Λ^{*}$ baryon resonances is a long-standing and fascinating problem. $Λ_{c}$ charm-baryon semileptonic weak decays to these resonances are highly sensitive to their internal structure and can be used to test theoretical models. We have performed the first lattice-QCD computation of the form factors governing $Λ_{c}$ semileptonic decays to a $Λ^{*}$ resonance: the $Λ^{*} (1520)$ , which has negative parity and spin $3 / 2$ . Here we present the resulting Standard Model predictions of the $Λ_{c} \to Λ^{*} (1520) ℓ^{+} ν_{ℓ}$ differential and integrated decay rates as well as angular observables. Furthermore, by combining the recent BESIII measurement of the $Λ_{c} \to X e^{+} ν_{e}$ inclusive semipositronic branching fraction [Phys. Rev. Lett. 121, 251801 (2018)] with lattice-QCD predictions of the $Λ_{c} \to Λ e^{+} ν_{e}$ , $Λ_{c} \to n e^{+} ν_{e}$ , and $Λ_{c} \to Λ^{*} (1520) e^{+} ν_{e}$ decay rates, we obtain an upper limit on the sum of the branching fractions to all other semipositronic final states. In particular, this upper limit constrains the $Λ_{c} \to Λ^{*} (1405) e^{+} ν_{e}$ branching fraction to be very small, which may be another hint for a molecular structure of the $Λ^{*} (1405)$ .

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Phys. Rev. D 105, L051505– Published 25 March, 2022

Vol. 105, Iss. 5 — 1 March 2022

Received 4 August 2021
Accepted 24 February 2022

DOI: https://doi.org/10.1103/PhysRevD.105.L051505

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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Charm-baryon semileptonic decays and the strange $Λ^{*}$ resonances: New insights from lattice QCD

Abstract

Physics Subject Headings (PhySH)

See Also

$Λ_{c} \to Λ^{} (1520)$ form factors from lattice QCD and improved analysis of the $Λ_{b} \to Λ^{} (1520)$ and $Λ_{b} \to Λ_{c}^{*} (2595, 2625)$ form factors

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Charm-baryon semileptonic decays and the strange Λ* resonances: New insights from lattice QCD

Abstract

Physics Subject Headings (PhySH)

See Also

Λc→Λ*(1520) form factors from lattice QCD and improved analysis of the Λb→Λ*(1520) and Λb→Λc*(2595,2625) form factors

Article Text

References (48)

Charm-baryon semileptonic decays and the strange $Λ^{*}$ resonances: New insights from lattice QCD

$Λ_{c} \to Λ^{} (1520)$ form factors from lattice QCD and improved analysis of the $Λ_{b} \to Λ^{} (1520)$ and $Λ_{b} \to Λ_{c}^{*} (2595, 2625)$ form factors