Remarks on the Pc structures and triangle singularities

. It was proposed that the narrow P c ( 4450 ) structure observed by the LHCb Collaboration in the reaction Λ b → J / ψ p K might be due to a triangle singularity around the χ c 1 -proton threshold at 4.45 GeV. We discuss the occurrence of a similar triangle singularity in the J / ψ p invariant mass...

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Bibliographic Details
Published in:The European physical journal. A, Hadrons and nuclei Hadrons and nuclei, 2016-10, Vol.52 (10), p.1-6, Article 318
Main Authors: Guo, Feng-Kun, Meißner, Ulf-G., Nieves, Juan, Yang, Zhi
Format: Article
Language:English
Subjects:
Exotic phenomena at the interface of nuclear and particle physics
Hadrons
Heavy Ions
Mass distribution
Nuclear Fusion
Nuclear Physics
Particle and Nuclear Physics
Physics
Physics and Astronomy
Regular Article - Theoretical Physics
Singularities
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Summary:. It was proposed that the narrow P c ( 4450 ) structure observed by the LHCb Collaboration in the reaction Λ b → J / ψ p K might be due to a triangle singularity around the χ c 1 -proton threshold at 4.45 GeV. We discuss the occurrence of a similar triangle singularity in the J / ψ p invariant mass distribution for the decay Λ b → J / ψ p π , which could explain the bump around 4.45 GeV in the data. More precise measurements of this process would provide valuable information towards an understanding of the P c structures.
ISSN:1434-6001
1434-601X
DOI:10.1140/epja/i2016-16318-4