Published October 2016 | Version v1
Journal article Metadata-only

QCD sum rule study of hidden-charm pentaquarks

Creators

  • 1. Beihang University, School of Physics and Beijing Key Laboratory of Advanced Nuclear Materials and Physics, Beijing (China)
  • 2. University of Saskatchewan, Department of Physics and Engineering Physics, Saskatoon, Saskatchewan (Canada)
  • 3. Lanzhou University and Institute of Modern Physics of CAS, Research Center for Hadron and CSR Physics, Lanzhou (China)
  • 4. Lanzhou University, School of Physical Science and Technology, Lanzhou (China)
  • 5. Peking University, Center of High Energy Physics, Beijing (China)
  • 6. Collaborative Innovation Center of Quantum Matter, Beijing (China)
  • 7. Peking University, School of Physics and State Key Laboratory of Nuclear Physics and Technology, Beijing (China)

Description

We study the mass spectra of hidden-charm pentaquarks having spin J = (1)/(2)/(3)/(2)/(5)/(2) and quark contents uudc anti c. We systematically construct all the relevant local hidden-charm pentaquark currents, and we select some of them to perform QCD sum rule analyses. We find that the Pc(4380) and Pc(4450) can be identified as hidden-charm pentaquark states composed of an anti-charmed meson and a charmed baryon. Besides them, we also find (a) the lowest-lying hidden-charm pentaquark state of JP = 1/2- has the mass 4.33+0.17-0.13 GeV, while the one of JP = 1/2+ is significantly higher, that is, around 4.7-4.9 GeV; (b) the lowest-lying hidden-charm pentaquark state of JP = 3/2- has the mass 4.37+0.18-0.13 GeV, consistent with the Pc(4380) of JP = 3/2-, while the one of JP = 3/2+ is also significantly higher, that is, above 4.6 GeV; (c) the hidden-charm pentaquark state of JP = 5/2- has a mass around 4.5-4.6 GeV, slightly larger than the Pc(4450) of JP = 5/2+. (orig.)

Availability note (English)

Available from: http://dx.doi.org/10.1140/epjc/s10052-016-4438-5

Additional details

Identifiers

DOI
10.1140/epjc/s10052-016-4438-5;

Publishing Information

Journal Title
European Physical Journal. C, Particles and Fields (Online)
Journal Volume
76
Journal Issue
10
Journal Page Range
p. 1-19
ISSN
1434-6052

INIS

Country of Publication
Germany
Country of Input or Organization
Germany
INIS RN
48000164
Subject category
S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
Resource subtype / Literary indicator
Numerical Data
Descriptors DEI
ALGEBRAIC CURRENTS; BARYONS; BOUND STATE; EXOTIC RESONANCES; FLAVOR MODEL; MANY-BODY PROBLEM; MASS SPECTRA; MESON-BARYON INTERACTIONS; PARTICLE STRUCTURE; QUANTUM CHROMODYNAMICS; REST MASS; SUM RULES; THEORETICAL DATA
Descriptors DEC
COMPOSITE MODELS; CURRENTS; DATA; ELEMENTARY PARTICLES; EQUATIONS; FERMIONS; FIELD THEORIES; HADRON-HADRON INTERACTIONS; HADRONS; INFORMATION; INTERACTIONS; MASS; MATHEMATICAL MODELS; NUMERICAL DATA; PARTICLE INTERACTIONS; PARTICLE MODELS; QUANTUM FIELD THEORY; QUARK MODEL; RESONANCE PARTICLES; SPECTRA