Adachi, I.Aggarwal, L.Ahmed, H.Ahn, J.K.Aihara, H.Akopov, N.Alhakami, M.Aloisio, A.Althubiti, N.Asner, D.M.Atmacan, H.Aushev, V.Aversano, M.Ayad, R.Babu, V.Bae, H.Baghel, N.K.Bahinipati, S.Bambade, P.Banerjee, S.et al.2025-10-232025-10-232025Physical Review Letters, 2025; 135(4):041901-1-041901-90031-90071079-7114https://hdl.handle.net/2440/147967Using 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.enPublished 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 SCOAP3Branching fraction; Hadron production; Hadronic decays; Multiquark bound states; Quark modelJournal article10.1103/pf8m-6j69746172De La Motte, S.A. [0000-0003-3905-6805]Harris, C. [0000-0003-0448-4244]Jackson, P. [0000-0002-0847-402X]