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Nuclear Theory·nucl-th

Friday·August 26, 2016

3 papers—1 primary·2 cross-listed

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  1. 01

    [Submitted on 25 Aug 2016]

    Why and are so narrow?

    K. P. Khemchandani🇧🇷 · A. Martínez Torres🇧🇷 · A. Hosaka🇯🇵 · H. Nagahiro🇯🇵 · F. S. Navarra🇧🇷 · M. Nielsen🇧🇷

    The baryons are expected to be naturally narrower as compared to their nonstrange and strange counterparts since they have only one light quark and, thus, their decay involves producing either a light meson and doubly strange baryon or both meson and baryon with strangeness which involves, relatively, more energy. In fact, some 's have full widths of the order of even 10-20 MeV when, in principle, they have a large phase space to decay to some open channels. Such is the case of , for which the width has been found to be of the order of 10 MeV in the latest {\it BABAR} and BELLE data. In this manuscript we study why some 's are so narrow. Based on a coupled channel calculation of the pseudoscalar meson-baryon and vector meson-baryon systems with chiral and hidden local symmetry Lagrangians, we find that the answer lies in the intricate hadron dynamics. We find that the known mass, width, spin-parity and branching ratios of can be naturally explained in terms of coupled channel meson-baryon dynamics. We find another narrow resonance which can be related to . We also look for exotic states and but find none. In addition we provide the cross sections for which can be useful for understanding the enhanced yield of reported in recent studies of heavy ion collisions.

    Comments:
    New calculations and results, published version, PRD
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1608.07086 [pdf]
    PRD(2018)·33 citations
  2. 02

    [Submitted on 25 Aug 2016] (cross-list from hep-ph)

    Stopped nucleons in configuration space

    Andrzej Bialas🇵🇱 · Adam Bzdak🇵🇱 · Volker Koch🇺🇸

    In this note, using the colour string model, we study the configuration space distribution of stopped nucleons in heavy-ion collisions. We find that the stopped nucleons from the target and the projectile end up separated from each other by the distance increasing with the collision energy. In consequence, for the center of mass energies larger than 6 or 10 GeV (depending on the details of the model) it appears that the system created is not in thermal and chemical equilibrium, and the net baryon density reached is likely not much higher than that already present in the colliding nuclei.

    Comments:
    8 pages, 2 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    1608.07041 [pdf]
    Acta Phys.Polon.B(2018)·26 citations
  3. 03

    [Submitted on 25 Aug 2016] (cross-list from hep-ph)

    Charting the future frontier(s) of particle production

    Jan Rafelski🇺🇸

    This short note describes the long collaborative effort between Arizona and Kraków, showing some of the key strangeness signatures of quark-gluon plasma. It further presents an annotated catalog of foundational questions defining the research frontiers which I believe can be addressed in the foreseeable future in the context of relativistic heavy ion collision experiments. The list includes topics that are specific to the field, and ventures towards the known-to-be-unknown that may have a better chance with ions as compared to elementary interactions.

    Comments:
    Dedicated to Andrzej Bialas in honour of his 80th birthday, 16 pages with some contextual pictures and remarks
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th); History and Philosophy of Physics (physics.hist-ph)
    arXiv:
    1608.07196 [pdf]
    Acta Phys.Polon.B(2016)·0 citations

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