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Title

First branching fraction measurement of the suppressed decay Ξc0 →π- Λc+

AuthorsLHCb Collaboration; García Martín, L.M.; Henry, L.; Jashal, B.; Martínez-Vidal, Fernando CSIC ORCID; Oyanguren, Arantza CSIC ORCID; Remón Alepuz, Clara; Ruiz Vidal, Joan; Sánchez Mayordomo, Carlos CSIC
Issue DateOct-2020
PublisherAmerican Physical Society
CitationPhysical Review D 102: 071101 (2020)
AbstractThe Ξc0 baryon is unstable and usually decays into charmless final states by the c→sud¯ transition. It can, however, also disintegrate into a π- meson and a Λc+ baryon via s quark decay or via cs→dc weak scattering. The interplay between the latter two processes governs the size of the branching fraction B(Ξc0→π-Λc+), first measured here to be (0.55±0.02±0.18)%, where the first uncertainty is statistical and second systematic. This result is compatible with the larger of the theoretical predictions that connect models of hyperon decays using partially conserved axial currents and SU(3) symmetry with those involving the heavy-quark expansion and heavy-quark symmetry. In addition, the branching fraction of the normalization channel, B(Ξc+→pK-π+)=(1.135±0.002±0.387)% is measured.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevD.102.071101
URIhttp://hdl.handle.net/10261/230873
Identifiersdoi: 10.1103/PhysRevD.102.071101
issn: 2470-0029
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