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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.
Physical Review Letters
|November 10, 2015
Summary
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.
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.
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