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 [udscc¯] pentaquark states decaying to J/ψΛ. Using the first observations of ϒ(1S,2S) inclusive decays to J/ψΛ, we find evidence of the Pcc¯s(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 Pcc¯s(4459)0 to be (4471.7±4.8±0.6) MeV/c2 and (22±13±3) MeV, respectively. The branching fractions for Pcc¯s(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)→Pcc¯s(4459)0/P¯cc¯s(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.
Adachi, I., Aggarwal, L., Ahmed, H., Ahn, J. k., Aihara, H., Akopov, N., et al. (2025). Search for Pcc¯s(4459)0 and Pcc¯s(4338)0 in ϒ(1S,2S) Inclusive Decays at Belle. PHYSICAL REVIEW LETTERS, 135(4), 041901-1-041901-9 [10.1103/pf8m-6j69].
Search for Pcc¯s(4459)0 and Pcc¯s(4338)0 in ϒ(1S,2S) Inclusive Decays at Belle
Branchini, P.Membro del Collaboration Group
;Budano, A.Membro del Collaboration Group
;Bussino, S.Membro del Collaboration Group
;De Pietro, G.Membro del Collaboration Group
;Laurenza, M.Membro del Collaboration Group
;Martellini, C.Membro del Collaboration Group
;Martini, A.Membro del Collaboration Group
;
2025-01-01
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 [udscc¯] pentaquark states decaying to J/ψΛ. Using the first observations of ϒ(1S,2S) inclusive decays to J/ψΛ, we find evidence of the Pcc¯s(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 Pcc¯s(4459)0 to be (4471.7±4.8±0.6) MeV/c2 and (22±13±3) MeV, respectively. The branching fractions for Pcc¯s(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)→Pcc¯s(4459)0/P¯cc¯s(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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
