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Towards Exotic Hidden-Charm Pentaquarks in QCD.

Hua-Xing Chen1, Wei Chen2, Xiang Liu3,4

  • 1School of Physics and Nuclear Energy Engineering and International Research Center for Nuclei and Particles in the Cosmos, Beihang University, Beijing 100191, China.

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|November 10, 2015
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This study identifies exotic hidden-charm pentaquarks, P(c)(4380) and P(c)(4450), as anticharmed mesons and charmed baryons. It predicts new pentaquarks and hidden-bottom pentaquarks for future experiments.

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Area of Science:

  • * Quantum Chromodynamics (QCD) and particle physics.
  • * Exotic hadron spectroscopy.

Background:

  • * The Large Hadron Collider beauty (LHCb) experiment has observed P(c)(4380) and P(c)(4450) pentaquarks.
  • * These observations suggest the existence of exotic hadrons beyond the conventional quark model.

Purpose of the Study:

  • * To investigate the nature of the observed P(c)(4380) and P(c)(4450) pentaquarks using QCD sum rules.
  • * To identify their quark-antiquark configurations and determine their quantum numbers.
  • * To predict the existence and properties of other hidden-charm and hidden-bottom pentaquarks.

Main Methods:

  • * Application of QCD sum rule calculations.
  • * Analysis of hadron compositions, specifically anticharmed mesons and charmed baryons.
  • * Determination of spin-parity quantum numbers (J(P)).

Main Results:

  • * P(c)(4380) and P(c)(4450) are identified as exotic hidden-charm pentaquarks with J(P)=3/2(-) and 5/2(+), respectively.
  • * Two additional hidden-charm pentaquarks (D̅Σ(c)(*) and D̅(*)Σ(c)(*)) with J(P)=3/2(-) and 5/2(+) are predicted.
  • * Mass predictions for hidden-bottom pentaquarks are provided.

Conclusions:

  • * The study provides a theoretical framework for understanding the P(c) states.
  • * The findings suggest new avenues for exploring exotic hadrons.
  • * Future experiments at LHCb and BelleII are encouraged to search for the predicted pentaquarks.