Hyperon production in Λc+ →k-pπ+ and Λc+ → KS0 pπ0

Jung Keun Ahn, Seongbae Yang, Seung Il Nam

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8 Citations (Scopus)

Abstract

We investigate S=-1 hyperon production from the Λc+→K-pπ+ and Λc+→KS0pπ0 decays within the effective Lagrangian approach. We consider the ς/Λ ground states, Λ(1520), Λ(1670)(Jp=1/2-), Λ(1890)(Jp=3/2+); Λ/ς-pole contributions from the combined resonances between 1800 and 2100 MeV; and N/Δ-pole and K∗-pole contributions, which include the proton, Δ(1232), and K(892). We calculate the Dalitz plot density (d2Γ/dMK-pdMK-π+) for the Λc+→K-pπ+ decay. The calculated result is in good agreement with experimental data from the Belle collaboration. Using the parameters from the fit, we present the Dalitz plot density for the Λc+→KS0pπ0 decay. In our calculation, a sharp peaklike structure near 1665 MeV is predicted in the Λc+→K-pπ+ decay because of the interference effects between the Λ(1670) resonance and η-Λ loop channels. We also demonstrate that we can access direct information regarding the weak couplings of Λ(1670) and ς(1670) from the Λc+→KS0pπ0 decay. Finally, a possible interpretation for the 1665 MeV structure beyond our prediction is briefly discussed.

Original languageEnglish
Article number034027
JournalPhysical Review D
Volume100
Issue number3
DOIs
Publication statusPublished - 2019 Aug 28

Bibliographical note

Publisher Copyright:
© 2019 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 SCOAP

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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