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Observation of a Narrow Pentaquark State, P_{c}(4312)^{+}, and of the Two-Peak Structure of the P_{c}(4450)^{+}.

著者 Aaij R , Abellán Beteta C , Adeva B , Adinolfi M , Aidala CA , Ajaltouni Z , Akar S , Albicocco P , Albrecht J , Alessio F , Alexander M , Alfonso Albero A , Alkhazov G , Alvarez Cartelle P , Alves AA , Amato S , Amhis Y , An L , Anderlini L , Andreassi G
Phys Rev Lett.2019 Jun 07 ; 122(22):222001.
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A narrow pentaquark state, P_{c}(4312)^{+}, decaying to J/ψp, is discovered with a statistical significance of 7.3σ in a data sample of Λ_{b}^{0}→J/ψpK^{-} decays, which is an order of magnitude larger than that previously analyzed by the LHCb Collaboration. The P_{c}(4450)^{+} pentaquark structure formerly reported by LHCb is confirmed and observed to consist of two narrow overlapping peaks, P_{c}(4440)^{+} and P_{c}(4457)^{+}, where the statistical significance of this two-peak interpretation is 5.4σ. The proximity of the Σ_{c}^{+}D[over ¯]^{0} and Σ_{c}^{+}D[over ¯]^{*0} thresholds to the observed narrow peaks suggests that they play an important role in the dynamics of these states.
PMID: 31283265 [PubMed]
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