PaperPanorama
FAQ

Nuclear Theory·nucl-th

Monday·January 18, 2016

9 papers—4 primary·5 cross-listed

All9Primary4Cross-lists5
  1. 05

    [Submitted on 12 Jan 2016] (cross-list from hep-ph)

    Hidden-charm Pentaquark States in Heavy Ion Collisions at the Large Hadron Collider

    Rui-Qin Wang🇨🇳 · Jun Song🇨🇳 · Kai-Jia Sun🇨🇳 · Lie-Wen Chen🇨🇳 · Gang Li🇨🇳 · Feng-Lan Shao🇨🇳

    In the framework of the quark combination, we derive the yield formulas and study the yield ratios of the hidden-charm pentaquark states in ultra-relativistic heavy ion collisions. We propose some interesting yield ratios which clearly exhibit the production relationships between different hidden-charm pentaquark states. We show how to employ a specific quark combination model to evaluate the yields of exotic , and their partners on the basis of reproducing the yields of normal identified hadrons, and execute the calculations in central Pb+Pb collisions at TeV as an example.

    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1601.02835 [pdf]
    PRC(2016)·19 citations
  2. 06

    [Submitted on 14 Jan 2016] (cross-list from hep-ph)

    Transport coefficients of heavy baryons

    Laura Tolos🇪🇸 · Juan M. Torres-Rincon🇫🇷 · Santosh K. Das🇮🇹

    We compute the transport coefficients (drag and momentum diffusion) of the low-lying heavy baryons and in a medium of light mesons formed at the later stages of high-energy heavy-ion collisions. We employ the Fokker-Planck approach to obtain the transport coefficients from unitarized baryon-meson interactions based on effective field theories that respect chiral and heavy-quark symmetries. We provide the transport coefficients as a function of temperature and heavy-baryon momentum, and analyze the applicability of certain nonrelativistic estimates. Moreover we compare our outcome for the spatial diffusion coefficient to the one coming from the solution of the Boltzmann-Uehling-Uhlenbeck transport equation and we find a very good agreement between both calculations. The transport coefficients for and in a thermal bath will be used in a subsequent publication as input in a Langevin evolution code for the generation and propagation of heavy particles in heavy-ion collisions at LHC and RHIC energies.

    Comments:
    26 pages, 12 figures. Title changed. Small additions and corrections. Version accepted for publication by Physical Review D journal
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1601.03743 [pdf]
    PRD(2016)·22 citations
  3. 07

    [Submitted on 15 Jan 2016] (cross-list from hep-ph)

    How to retrieve additional information from the multiplicity distributions

    Grzegorz Wilk🇵🇱 · Zbigniew Włodarczyk🇵🇱

    Multiplicity distributions measured in multiparticle production processes are most frequently described by the Negative Binomial Distribution (NBD). However, with increasing collision energy some systematic discrepancies become more and more apparent. They are usually attributed to the possible multi-source structure of the production process and described using a multi-NBD form of the multiplicity distribution. We investigate the possibility of keeping a single NBD but with its parameters depending on the multiplicity . This is done by modifying the widely known clan model of particle production leading to the NBD form of . This is then confronted with the approach based on the so-called cascade-stochastic formalism which is based on different types of recurrence relations defining . We demonstrate that a combination of both approaches allows the retrieval of additional valuable information from the multiplicity distributions, namely the oscillatory behavior of the counting statistics apparently visible in the high energy data.

    Comments:
    A few cosmetical changes. Version accepted for publication by J.Phys. G
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1601.03883 [pdf]
    J.Phys.G(2017)·24 citations
  4. 08

    [Submitted on 15 Jan 2016] (cross-list from hep-ph)

    Weak decays of heavy hadrons into dynamically generated resonances

    Eulogio Oset🇨🇳 · Wei-Hong Liang🇨🇳 · Melahat Bayar🇹🇷 · Ju-Jun Xie🇨🇳 · Lian Rong Dai🇨🇳 · Miguel Albaladejo🇪🇸 · Marina Nielsen🇧🇷 · Takayasu Sekihara🇯🇵 · Fernando Navarra🇧🇷 · Luis Roca🇪🇸 · Maxim Mai🇩🇪 · Juan Nieves🇪🇸 and 15 other authors

    In this review we give a perspective of the theoretical work done recently on the interpretation of results from , , , weak decays into final states that contain interacting hadrons, and how it is possible to obtain additional valuable information that is increasing our understanding of hadron interactions and the nature of many hadronic resonances. The novelty of these processes is that one begins with a clean picture at the quark level which allows one to select the basic mechanisms by means of which the process proceeds. Finally, one has a final state described in terms of quarks. To make contact with the experiments, where mesons and baryons are observed, one must hadronize, creating pairs of and writing the new states in terms of mesons and baryons. This concludes the primary hadron production in these processes. After that, the interaction of these hadrons takes place, offering a rich spectrum of resonances and special features from where it is possible to learn much about the interaction of these hadrons and the nature of many resonances in terms of the components of their wave functions.

    Comments:
    Review paper comissioned for International Journal of Modern Physics E
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1601.03972 [pdf]
    IJMPE(2016)·160 citations
  5. 09

    [Submitted on 15 Jan 2016] (cross-list from nucl-ex)

    Coulomb breakup of neutron-rich Na isotopes near the island of inversion

    A . Rahaman · Ushasi Datta · T. Aumann · S. Beceiro-Novo · K. Boretzky · C. Caesar · B.V. Carlson · W.N. Catford · S. Chakraborty · M. Chartier · D. Cortina-Gil · G. De. Angelis and 41 other authors

    First results are reported on the ground state configurations of the neutron-rich Na isotopes, obtained via Coulomb dissociation (CD) measurements as a method of the direct probe. The invariant mass spectra of those nuclei have been obtained through measurement of the four-momentum of all decay products after Coulomb excitation on a target at energies of 400-430 MeV/nucleon using FRS-ALADIN-LAND setup at GSI, Darmstadt. Integrated Coulomb-dissociation cross-sections (CD) of 89 mb and 167 mb up to excitation energy of 10 MeV for one neutron removal from Na and Na respectively, have been extracted. The major part of one neutron removal, CD cross-sections of those nuclei populate core, in its' ground state. A comparison with the direct breakup model, suggests the predominant occupation of the valence neutron in the ground state of Na and Na is the orbital with small contribution in the -orbital which are coupled with ground state of the core. The ground state configurations of these nuclei are as Na_{gs (1^+)\otimes\nu_{s,d} and Na, respectively. The ground state spin and parity of these nuclei, obtained from this experiment are in agreement with earlier reported values. The spectroscopic factors for the valence neutron occupying the and orbitals for these nuclei in the ground state have been extracted and reported for the first time. A comparison of the experimental findings with the shell model calculation using MCSM suggests a lower limit of around 4.3 MeV of the sd-pf shell gap in Na.

    Comments:
    Modified version of the manuscript is accepted for publication in Journal of Physics G, Jan., 2017
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1601.04002 [pdf]
    J.Phys.G(2017)·7 citations

Affiliations

first authorsco-authorsvia INSPIRE