$P_c(4457)^+$, $P_c(4440)^+$, and $P_c(4312)^+$: molecules or compact pentaquarks? - INSPIRE

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$P_c(4457)^+$ , $P_c(4440)^+$ , and $P_c(4312)^+$ : molecules or compact pentaquarks?

Jian-Bo Cheng
(
- Shandong U.
)
,
Yan-Rui Liu
(
- Shandong U.
)

May 21, 2019

14 pages

Published in:

Phys.Rev.D 100 (2019) 5, 054002

Published: Sep 4, 2019

e-Print:

1905.08605 [hep-ph]

DOI:

10.1103/PhysRevD.100.054002

View in:

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Abstract: (APS)

In a chromomagnetic model, we analyze the properties of the newly observed Pc(4457)+, Pc(4440)+, and Pc(4312)+ states. We estimate the masses of the (uud)8c(cc¯)8c and (uds)8c(cc¯)8c pentaquark states by considering the isospin breaking effects. Their values are determined by calculating mass distances from the Σc++D- and Ξc′+D- thresholds, respectively. It is found that the isospin breaking effects on the spectrum are small. From the uncertainty consideration and the rearrangement decay properties in a simple model, we find that it is possible to assign the Pc(4457)+, Pc(4440)+, and Pc(4312)+ as JP=3/2-, 1/2-, and 3/2- pentaquark states, respectively. The assignment in the molecule picture can be different, in particular for the Pc(4312)+. The information from open-charm channels, e.g., B[Pc→Σc++D-]/B[Pc→J/ψp], will play an important role in distinguishing the inner structures of the Pc states. Discussions and predictions based on the calculations are also given.

Note:

15 pages, 2 figures, 8 tables. Version accepted by PRD

14.20.Pt
12.39.Jh
Strong Interactions
pentaquark
structure
isospin: symmetry breaking
compact
decay
mass spectrum
numerical calculations

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