20,099 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

    Solution of partial differential equations on vector and parallel computers

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    The present status of numerical methods for partial differential equations on vector and parallel computers was reviewed. The relevant aspects of these computers are discussed and a brief review of their development is included, with particular attention paid to those characteristics that influence algorithm selection. Both direct and iterative methods are given for elliptic equations as well as explicit and implicit methods for initial boundary value problems. The intent is to point out attractive methods as well as areas where this class of computer architecture cannot be fully utilized because of either hardware restrictions or the lack of adequate algorithms. Application areas utilizing these computers are briefly discussed

    Axioms for consensus functions on the n-cube

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    An elementary general result is proved that allows for simple characterizations of well-known location/consensus functions (median, mean and center) on the n-cube. In addition, alternate new characterizations are given for the median and anti-median functions on the n-cube.Comment: 12 page

    A bibliography on parallel and vector numerical algorithms

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    This is a bibliography of numerical methods. It also includes a number of other references on machine architecture, programming language, and other topics of interest to scientific computing. Certain conference proceedings and anthologies which have been published in book form are listed also
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