Search for 𝑃𝑐⁢𝑐‾𝑠⁢(4459)⁰ and 𝑃𝑐⁢𝑐‾𝑠⁢(4338)⁰ in ϒ⁡(1⁢𝑆,2⁢𝑆) Inclusive Decays at Belle

Date

2025

Authors

Adachi, I.
Aggarwal, L.
Ahmed, H.
Ahn, J.K.
Aihara, H.
Akopov, N.
Alhakami, M.
Aloisio, A.
Althubiti, N.
Asner, D.M.

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Volume Title

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Journal article

Citation

Physical Review Letters, 2025; 135(4):041901-1-041901-9

Statement of Responsibility

The Belle and Belle II Collaborations

Conference Name

DOI

10.1103/pf8m-6j69

Abstract

Using data samples of 102 million ϒ(1S) events and 158 million ϒ(2S) events collected by the Belle detector at the KEKB asymmetric-energy e⁺e⁻ collider, we search for [udsc¯c] pentaquark states decaying to J/ψΛ. Using the first observations of ϒ(1S; 2S) inclusive decays to J/ψΛ, we find evidence of the Pc¯cs(4459)⁰ state with a local significance of 3.3 standard deviations, including statistical and systematic uncertainties. We measure the mass and width of the Pc¯cs(4459)⁰ to be (4471.7 ± 4.8 ± 0.6) MeV/c² and (22 ± 13 ± 3) MeV, respectively. The branching fractions for Pc¯cs(4459)⁰ production are measured to be B[ϒ(1S)→Pcc¯s(4459)⁰/P¯cc¯s(4459)⁰ + anything] = (3.5 ± 2.0 ± 0.2) ×10⁻⁶ and B[ϒ(2S) → Pc¯cs(4459)⁰/ P¯c¯cs(4459)⁰ + anything] = (2.9 ± 1.7 ± 0.4) × 10⁻⁶. The inclusive branching fractions of ϒ(1S; 2S) → J/ψΛ/Λ¯ are measured to be B[ϒ(1S) → J/ψΛ/Λ¯ + anything] = (36.9 ± 5.3 ± 2.4) × 10⁻⁶ and B[ϒ(2S) → J/ψΛ/Λ¯ + anything] = (22.3 ± 5.7 ± 3.1) × 10⁻⁶. We measure the visible cross section σ(e⁺e⁻ → J/ψΛ/Λ¯ + anything) = (90 ± 14 ± 6) fb for the continuum production at √s = 10.52 GeV. In all cases, the first uncertainties are statistical and the second are systematic.

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Dissertation Note

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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

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Grant ID

http://purl.org/au-research/grants/arc/DP200101792
 http://purl.org/au-research/grants/arc/DP210101900
 http://purl.org/au-research/grants/arc/DP210102831
 http://purl.org/au-research/grants/arc/DE220100462
 http://purl.org/au-research/grants/arc/LE210100098
 http://purl.org/au-research/grants/arc/LE230100085

Published Version

https://doi.org/10.1103/pf8m-6j69

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Persistent link to this record

https://hdl.handle.net/2440/147967