First branching fraction measurement of the suppressed decay
The $$Ξ^0_c$$ baryon is unstable and usually decays into charmless final states by the $$c → su\bar{d}$$ transition. It can, however, also disintegrate into a $π^-$ meson and a $$Λ^+_c$$ 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 $$\mathcal{B}$$($$Ξ^0_c → π^-Λ^+_c$$) , 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, $$\mathcal{B}$$($$Ξ^+_c → pK^-π^+$$) = ( 1.135 ± 0.002 ± 0.387 ) % is measured.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- Contributing Organization:
- LHCb Collaboration
- Grant/Contract Number:
- 89233218CNA000001
- OSTI ID:
- 1671862
- Alternate ID(s):
- OSTI ID: 1846140
- Report Number(s):
- LA-UR-20-25449; PRVDAQ; 071101
- Journal Information:
- Physical Review D, Journal Name: Physical Review D Vol. 102 Journal Issue: 7; ISSN 2470-0010
- Publisher:
- American Physical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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