LHCb pentaquarks in constituent quark models

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• 作者：P.G. Ortega^a ; ^{Pablo.Garcia@ific.uv.es} ; D.R. Entem^b ; ^{entem@usal.es} ; F. Ferná ; ndez^b
• 关键词：Models of strong interactions ; Heavy quarkonia ; Potential models
• 刊名：Physics Letters B
• 出版年：2017
• 出版时间：10 January 2017
• 年：2017
• 卷：764
• 期：Complete
• 页码：207-211
• 全文大小：241 K
• 卷排序：764

文摘

The recently discovered Pc(4380)+Pc(4380)+ and Pc(4450)+Pc(4450)+ states at LHCb have masses close to the D¯Σc⁎ and D¯⁎Σc thresholds, respectively, which suggest that they may have significant meson–baryon molecular components. We analyze these states in the framework of a constituent quark model which has been applied to a wide range of hadronic observables, being the model parameters, therefore, completely constrained.The Pc(4380)+Pc(4380)+ and Pc(4450)+Pc(4450)+ are studied as molecular states composed by charmed baryons and open charm mesons. Several bound states with the proper binding energy are found in the D¯Σc⁎ and D¯⁎Σc channels. We discuss the possible assignments of these states from their decay widths. Moreover, two more states are predicted, associated with the D¯Σc and D¯⁎Σc⁎ thresholds.