Regular Article - Theoretical Physics
Interpretations of the new LHCb pentaquark state
CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, 100190, Beijing, China
2 School of Physics, Beihang University, 100191, Beijing, China
3 Centre d’Études Nucléaires, CNRS/IN2P3, Université de Bordeaux, 33175, Gradignan, France
Accepted: 15 June 2022
Published online: 30 June 2022
Recently the LHCb Collaboration has observed a new pentaquark state, the . Owing to its proximity to the , , and 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 might be a bound state, (ii) the and might be and states close to threshold, respectively, where the Breit–Wigner mass might not correspond to the location of the poles, (iii) the locations of the and might be explained in terms of the - and - coupled channel dynamics. This last option, though not the most probable explanation, is still potentially compatible with the double peak solution of the and with what we know of the . 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.
© The Author(s) 2022
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