Abstract
The possible production of the neutral Pc (4380) and Pc (4450) in the J-PARC experiment is discussed. Different spin-parity assignments of the Pc states are considered and differential cross sections of π − p → J /ψp are calculated. Moreover, the strong decays of Pc → J /ψp are estimated based on a Σc D * molecular scenario. Our results disfavor all the P − wave Σc D * assignments, while favor the S − wave Σc D * picture of the two Pc states comparing to the experimental data. In addition, we also analyze the possible J P =3/2− state in Σc *D and Σc *D * pictures with heavy quark limit.
Highlights
It is well-known that two hidden charm pentaquark resonances P+c (4380) and P+c (4450) were reported by the LHCb Collaboration in the process of Λ0b → J/ψK− p [1]
In this paper we show our estimate for the production of the two neutral Pc states in the π− p → J/ψn process, which may be measured in the future experiment at J-PARC
We show a calculation for the strong decay of Pc → J/ψp based on a ΣcD ∗ molecule scenario
Summary
It is well-known that two hidden charm pentaquark resonances P+c (4380) and P+c (4450) were reported by the LHCb Collaboration in the process of Λ0b → J/ψK− p [1] Their masses and widths are (4380 ± 8 ± 29; 205 ± 18 ± 86) MeV for Pc(4380) and (4449.8 ± 1.7 ± 2.5; 39 ± 5 ± 19) MeV for Pc(4450), respectively. There are many interesting studies on these two Pc states in the literature They may be interpreted as the compact pentaquark states, where the five quarks are tightly bounded and interact with each other via color magnetic interaction directly [6, 7]. In the Λ0b → J/ψK− p decay process, only charged Pc states can be observed.
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