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Title: Molecular interpretation of the P c ( 4440 ) and P c ( 4457 ) states

Abstract

A molecular model of the P c ( 4457 ) and P c ( 4457 ) LHCb states is proposed. The model relies on channels coupled by long-range pion-exchange dynamics with features that depend crucially on the novel addition of the Λ c(2595)¯ D channel. A striking prediction of the model is the unusual combination of quantum numbers J P(4457) = 1/2 + and J P(4440) = 3/2 . Unlike in other models, a simultaneous description of both states is achieved without introducing additional short-range interactions. The model also gives a natural explanation for the relative widths of the states. We show that the usual molecular scenarios cannot explain the production rate of P c states in Λ b decays and that this can be resolved by including Λ c(2595)D¯ and related channels. Experimental tests and other states are discussed in the conclusions.

Authors:
ORCiD logo [1];  [2]
  1. Swansea Univ. (United Kingdom)
  2. Univ. of Pittsburgh, PA (United States)
Publication Date:
Research Org.:
Swansea Univ. (United Kingdom)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1580142
Alternate Identifier(s):
OSTI ID: 1595996
Grant/Contract Number:  
SC0019232
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 100; Journal Issue: 11; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Burns, T. J., and Swanson, E. S. Molecular interpretation of the Pc(4440) and Pc(4457) states. United States: N. p., 2019. Web. doi:10.1103/PhysRevD.100.114033.
Burns, T. J., & Swanson, E. S. Molecular interpretation of the Pc(4440) and Pc(4457) states. United States. doi:10.1103/PhysRevD.100.114033.
Burns, T. J., and Swanson, E. S. Fri . "Molecular interpretation of the Pc(4440) and Pc(4457) states". United States. doi:10.1103/PhysRevD.100.114033.
@article{osti_1580142,
title = {Molecular interpretation of the Pc(4440) and Pc(4457) states},
author = {Burns, T. J. and Swanson, E. S.},
abstractNote = {A molecular model of the Pc(4457) and Pc(4457) LHCb states is proposed. The model relies on channels coupled by long-range pion-exchange dynamics with features that depend crucially on the novel addition of the Λc(2595)¯ D channel. A striking prediction of the model is the unusual combination of quantum numbers JP(4457) = 1/2+ and JP(4440) = 3/2–. Unlike in other models, a simultaneous description of both states is achieved without introducing additional short-range interactions. The model also gives a natural explanation for the relative widths of the states. We show that the usual molecular scenarios cannot explain the production rate of Pc states in Λb decays and that this can be resolved by including Λc(2595)D¯ and related channels. Experimental tests and other states are discussed in the conclusions.},
doi = {10.1103/PhysRevD.100.114033},
journal = {Physical Review D},
number = 11,
volume = 100,
place = {United States},
year = {2019},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevD.100.114033

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