Interpretations of the new LHCb Pc(4337)+ pentaquark state

Recently the LHCb Collaboration has observed a new pentaquark state, the P c ( 4337 ) + . Owing to its proximity to the χ c 0 ( 1 S ) p , D ¯ ∗ Λ c , D ¯ Σ c and D ¯ Σ c ∗ thresholds, this new pentaquark might very well be a meson–baryon bound state. However its spin and parity have not been determi...

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Bibliographic Details
Published in:The European physical journal. C, Particles and fields Particles and fields, 2022-06, Vol.82 (6)
Main Authors: Yan, Mao-Jun, Peng, Fang-Zheng, Sánchez, Mario Sánchez, Valderrama, Manuel Pavon
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics and Cosmology
Baryons
Charm (particle physics)
Collaboration
Elementary Particles
Hadrons
Heavy Ions
Measurement Science and Instrumentation
Nuclear Energy
Nuclear Physics
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Regular Article - Theoretical Physics
String Theory
Theoretical physics
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Summary:Recently the LHCb Collaboration has observed a new pentaquark state, the P c ( 4337 ) + . Owing to its proximity to the χ c 0 ( 1 S ) p , D ¯ ∗ Λ c , D ¯ Σ c and D ¯ Σ c ∗ thresholds, this new pentaquark might very well be a meson–baryon bound state. However its spin and parity have not been determined yet and none of the previous possibilities can be ruled out.We briefly explore a few of these options and the consequences they entail in the present manuscript: (i) the P c ( 4337 ) + might be a χ c 0 ( 1 S ) p bound state, (ii) the P c ( 4312 ) + and P c ( 4337 ) + might be D ¯ ∗ Λ c and D ¯ Σ c states close to threshold, respectively, where the Breit–Wigner mass might not correspond to the location of the poles, (iii) the locations of the P c ( 4312 ) + and P c ( 4337 ) + might be explained in terms of the D ¯ ∗ Λ c - D ¯ Σ c and D ¯ ∗ Λ c - D ¯ Σ c ∗ coupled channel dynamics. This last option, though not the most probable explanation, is still potentially compatible with the double peak solution of the P cs ( 4459 ) 0 and with what we know of the P c ( 4312 ) + . As a byproduct of the previous explorations, we conjecture the existence of a series of anticharmed meson – antitriplet charmed baryon bound states and calculate their masses.
ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s10052-022-10522-7