Journal
PHYSICAL REVIEW D
Volume 100, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.100.054006
Keywords
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Funding
- National Natural Science Foundation of China (NSFC) [11975165, 11425525, 11521505, 11675091, 11735003, 11835015, 11475227]
- Deutsche Forschungsgemeinschaft (DFG)
- NSFC [11621131001]
- DFG [TRR110]
- National Key Basic Research Program of China [2015CB856700]
- Youth Innovation Promotion Association CAS [2016367]
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A resonance-like structure as narrow as 10 MeV is observed in the K- p invariant mass distributions in Lambda(+)(c)-> pK(-)pi(+) at Belie. Based on the large data sample of about 1.5 million events and the small bin width of just 1 MeV for the K- p invariant mass spectrum, the narrow peak is found precisely lying at the Lambda eta threshold. While lacking evidence for a quark model state with such a narrow width at this mass region, we find that this narrow structure can be naturally identified as a threshold cusp but enhanced by the nearby triangle singularity via the Lambda-a(0)(980)+ or eta-Sigma(1660)(+) rescatterings.
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