We report the first observation of the two-body baryonic decays 𝐵+ →Σ𝑐(2455)++ ¯ Ξ − 𝑐 and 𝐵0 →Σ𝑐(2455)0 ¯ Ξ 0 𝑐 with significances of 7.3𝜎 and 6.2𝜎, respectively, including statistical and systematic uncertainties. The branching fractions are measured to be ℬ(𝐵+ →Σ𝑐(2455)++ ¯ Ξ − 𝑐) =(5.74 ±1.11 ±0.42+2.47 −1.53) ×10−4 and ℬ(𝐵0 →Σ𝑐(2455)0 ¯ Ξ 0 𝑐) =(4.83 ±1.12 ±0.37+0.72 −0.60) ×10−4. The first and second uncertainties are statistical and systematic, respectively, while the third ones arise from the absolute branching fractions of ¯ Ξ − 𝑐 or ¯ Ξ 0 𝑐 decays. The data samples used for this analysis have integrated luminosities of 711 fb−1 and 365 fb−1, and were collected at the ϒ(4𝑆) resonance by the Belle and Belle II detectors operating at the KEKB and SuperKEKB asymmetric-energy 𝑒+𝑒− colliders, respectively.
Observation of the decays 𝐵+ →Σ𝑐(2455)++¯Ξ−𝑐 and 𝐵0 →Σ𝑐(2455)0¯Ξ0𝑐
Bertacchi, V.;Bettarini, S.;Casarosa, G.;Corona, L.;Forti, F.;Lueck, T.;Massaccesi, L.;Mondal, S.;Moneta, S.;Rizzo, G.;Tenchini, F.;Trantou, F. F.;Zani, L.;
2025-01-01
Abstract
We report the first observation of the two-body baryonic decays 𝐵+ →Σ𝑐(2455)++ ¯ Ξ − 𝑐 and 𝐵0 →Σ𝑐(2455)0 ¯ Ξ 0 𝑐 with significances of 7.3𝜎 and 6.2𝜎, respectively, including statistical and systematic uncertainties. The branching fractions are measured to be ℬ(𝐵+ →Σ𝑐(2455)++ ¯ Ξ − 𝑐) =(5.74 ±1.11 ±0.42+2.47 −1.53) ×10−4 and ℬ(𝐵0 →Σ𝑐(2455)0 ¯ Ξ 0 𝑐) =(4.83 ±1.12 ±0.37+0.72 −0.60) ×10−4. The first and second uncertainties are statistical and systematic, respectively, while the third ones arise from the absolute branching fractions of ¯ Ξ − 𝑐 or ¯ Ξ 0 𝑐 decays. The data samples used for this analysis have integrated luminosities of 711 fb−1 and 365 fb−1, and were collected at the ϒ(4𝑆) resonance by the Belle and Belle II detectors operating at the KEKB and SuperKEKB asymmetric-energy 𝑒+𝑒− colliders, respectively.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.


