Measurements of the Branching Fractions B(B−→Λ¯−cΞ′0c), B(B−→Λ¯−cΞc(2645)0) and B(B−→Λ¯−cΞc(2790)0)

Li, Y and Li, Y B and Giri, Anjan Kumar and et al, . (2019) Measurements of the Branching Fractions B(B−→Λ¯−cΞ′0c), B(B−→Λ¯−cΞc(2645)0) and B(B−→Λ¯−cΞc(2790)0). arXiv.org.

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Abstract

Using the data sample of 711 fb−1 of Υ(4S) on-resonance data taken by the Belle detector at the KEKB asymmetric-energy electron-positron collider, we present the first measurements of branching fractions of the decays B−→Λ¯−cΞ′0c, B−→Λ¯−cΞc(2645)0, and B−→Λ¯−cΞc(2790)0. The signal yields for these decays are extracted from the recoil mass spectrum of the system recoiling against Λ¯−c baryons in selected B− candidates. The branching fraction of B−→Λ¯−cΞc(2790)0 is measured to be (1.1±0.4±0.2)×10−3, where the first uncertainty is statistical and the second systematic. The 90\% credibility level upper limits on B(B−→Λ¯−cΞ′0c) and B(B−→Λ¯−cΞc(2645)0) are determined to be 6.5×10−4 and 7.9×10−4, respectively.

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