16,903 research outputs found

    LHCb pentaquarks in constituent quark models

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    The recently discovered Pc(4380)+P_c(4380)^+ and Pc(4450)+P_c(4450)^+ states at LHCb have masses close to the DˉΣc∗\bar D\Sigma_c^* and Dˉ∗Σc\bar D^*\Sigma_c 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)+P_c(4380)^+ and Pc(4450)+P_c(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 DˉΣc∗\bar D\Sigma_c^* and Dˉ∗Σc\bar D^*\Sigma_c channels. We discuss the possible assignments of these states from their decay widths. Moreover, two more states are predicted, associated with the DˉΣc\bar D\Sigma_c and Dˉ∗Σc∗\bar D^* \Sigma_c^* thresholds.Comment: 5 pages, 2 table

    Relation-based Galois connections: towards the residual of a relation

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    Inma P. Cabrera, Pablo Cordero, Manuel Ojeda-Aciego, Relation-based Galois connections: towards the residual of a relation, CMMSE 2017: Proceedings of the 17th International Conference on Mathematical Methods in Science and Engineering ( ISBN: 978-84-617-8694-7) , pp. 469--475We explore a suitable generalization of the notion of Galois connection in which their components are binary relations. Many different approaches are possible depending both on the (pre-)order relation between subsets in the underlying powerdomain and the chosen type of relational composition.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

    PUK21 RESEARCH NETWORK ON TRANSPLANTATION: FEMALES ON THE WAITING LIST FOR RENAL TRANSPLANT SHOW A POORER PERCEIVED STATE OF HEALTH THAN DO MALES

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    Heavy mesons in the Quark Model

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    Since the discovery of the J/ψJ/\psi, the quark model was very successful in describing the spectrum and properties of heavy mesons including only qqˉq\bar q components. However since 2003, with the discovery of the X(3872)X(3872), many states that can not be accommodated on the naive quark model have been discovered, and they made unavoidable to include higher Fock components on the heavy meson states. We will give an overview of the success of the quark model for heavy mesons and point some of the states that are likely to be more complicated structures such as meson-meson molecules.Comment: Contribution to the Proceedings of the 15th International Workshop on Meson Physics - MESON201

    Puzzles in quarkonium hadronic transitions with two pion emission

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    The anomalously large rates of some hadronic transitions from quarkonium are studied using QCD multipole expansion (QCDME) in the framework of a constituent quark model which has been successful in describing hadronic phenomenology. The hybrid intermediate states needed in the QCDME method are calculated in a natural extension of our constituent quark model based on the Quark Confining String (QCS) scheme. Some of the anomalies are explained due to the presence of an hybrid state with a mass near the mass of the decaying resonance whereas other are justified by the presence of molecular components in the wave function. Some unexpected results are pointed out.Comment: Conference proceedings of the XI Quark Confinement and the Hadron Spectrum (CONFINEMENT XI). Saint Petersburg (Russia) from 8 to 12 September 201

    The X(3872) and other possible XYZXYZ molecular states

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    We perform a coupled channel calculation of the DD∗DD^* and ccˉc\bar c sectors in the framework of a constituent quark model. The interaction for the DD∗DD^* states is obtained using the Resonant Group Method (RGM) and the underlying quark interaction model. The coupling with the two quark system is performed using the 3P0^3 P_0 model. The X(3872) is found as a molecular state with a sizable ccˉc\bar c component. A comparison with Belle and BaBar data has been done, finding a good agreement. Other possible molecular molecular states are discussed.Comment: 5 pages, 5 figures, Proceedings to the Hadron 2009 - XIII International Conference on Hadron Spectroscopy, Florida State University (USA
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