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Nuclear Theory·nucl-th

Thursday·August 30, 2018

14 papers—7 primary·7 cross-listed

All14Primary7Cross-lists7
  1. 08

    Novel physics opportunities at the HESR-Collider with PANDA at FAIR

    Leonid Frankfurt🇮🇱 · Mark Strikman🇺🇸 · Alexei Larionov🇩🇪 · Andreas Lehrach🇩🇪 · Rudolf Maier🇩🇪 · Hendrik van Hees🇩🇪 · Christian Spieles🇩🇪 · Volodymyr Vovchenko🇩🇪 · Horst Stoecker🇩🇪

    Exciting new scientific opportunities are presented for the PANDA detector at the High Energy Storage Ring in the redefined collider mode, HESR-C, at the Facility for Antiproton and Ion Research (FAIR) in Europe. The high luminosity, cm s, and a wide range of intermediate and high energies, up to 30 GeV for collisions will allow to explore a wide range of exciting topics in QCD, including the study of the production of excited open charm and bottom states, nuclear bound states containing heavy (anti)quarks, the interplay of hard and soft physics in the dilepton production, and the exploration of the regime where gluons -- but not quarks -- experience strong interaction.

    ↳ hep-phhep-exnucl-exnucl-th4 citations
  2. 09

    Antinuclei in Heavy-Ion Collisions

    Jinhui Chen🇨🇳 · Declan Keane🇺🇸 · Yugang Ma🇨🇳 · Aihong Tang🇺🇸 · Zhangbu Xu🇺🇸

    We review progress in the study of antinuclei, starting from Dirac's equation and the discovery of the positron in cosmic-ray events. The development of proton accelerators led to the discovery of antiprotons, followed by the first antideuterons, demonstrating that antinucleons bind into antinuclei. With the development of heavy-ion programs at the Brookhaven AGS and CERN SPS, it was demonstrated that central collisions of heavy nuclei offer a fertile ground for research and discoveries in the area of antinuclei. In this review, we emphasize recent observations at Brookhaven's Relativistic Heavy Ion Collider and at CERN's Large Hadron Collider, namely, the antihypertriton and the antihelium-4, as well as measurements of the mass difference between light nuclei and antinuclei, and the interaction between antiprotons. Physics implications of the new observations and different production mechanisms are discussed. We also consider implications for related fields, such as hypernuclear physics and space-based cosmic-ray experiments.

    ↳ nucl-exhep-phnucl-thPhys.Rept.(2018)·160 citations
  3. 10

    Interactions between vector mesons and dynamically generated resonances

    Meng-Lin Du🇩🇪 · Dilege Gülmez🇩🇪 · Feng-Kun Guo🇨🇳 · Ulf-G. Meißner🇩🇪 · Qian Wang🇩🇪

    The interaction and the corresponding dynamically generated bound states are revisited. We demonstrate that an improved unitarization method is necessary to study the pole structures of amplitudes outside the near-threshold region. In this work, we extend the study of the covariant scattering in a unitarized chiral theory to the -wave interactions for the whole vector-meson nonet. We demonstrate that there are unphysical left-hand cuts in the on-shell factorization approach of the Bethe-Salpeter equation. This is in conflict with the correct analytic behavior and makes the so-obtained poles, corresponding to possible bound states or resonances, unreliable. To avoid this difficulty, we employ the first iterated solution of the method and investigate the possible dynamically generated resonances from vector-vector interactions. A comparison with the results from the nonrelativistic calculation is provided as well.

    ↳ hep-phhep-exhep-latnucl-thEPJC(2018)·48 citations
  4. 11

    Strongly intensive observable between multiplicities in two acceptance windows in a string model

    Evgeny Andronov🇷🇺 · Vladimir Vechernin🇷🇺

    The strongly intensive observable between multiplicities in two acceptance windows separated in rapidity and azimuth is calculated in the model with quark-gluon strings acting as sources. The dependence of this observable on the two-particle correlation function of a string, the width of observation windows and the rapidity gap between them is analyzed. In the case with independent identical strings the model calculation confirms the strongly intensive character of this observable: it is independent of both the mean number of string and its fluctuation. For this case the peculiarities of its behaviour for particles with different electric charges are also analyzed. In the case when the string fusion processes are taken into account and a formation of strings of a few different types takes place in a collision, this observable is proved to be equal to a weighted average of its values for different string types. Unfortunately, in this case through the weight factors this observable becomes dependent on collision conditions and, strictly speaking, can not be considered any more as strongly intensive variable. For a comparison the results of the calculation of considered observable with the PYTHIA event generator are also presented.

    ↳ hep-phnucl-thEPJA(2019)·26 citations
  5. 12

    Two particle azimuthal harmonics in pA collisions

    Manyika Kabuswa Davy🇨🇳 · Cyrille Marquet🇫🇷 · Yu Shi🇨🇳 · Bo-Wen Xiao🇨🇳 · Cheng Zhang🇨🇳

    We compute two-particle production in p+A collisions and extract azimuthal harmonics, using the dilute-dense formalism in the Color Glass Condensate framework. The multiple scatterings of the partons inside the projectile proton on the dense gluons inside the target nucleus are expressed in terms of Wilson lines. They generate interesting correlations, which can be partly responsible for the signals of collectivity measured at RHIC and at the LHC. Most notably, while gluon Wilson loops yield vanishing odd harmonics, quark Wilson loops can generate sizable odd harmonics for two particle correlations. By taking both quark and gluon channels into account, we find that the overall second and third harmonics lie rather close to the recent PHENIX data at RHIC.

    ↳ hep-phnucl-thNPA(2019)·18 citations
  7. 14

    Theoretical analysis of double parton scatterings in quarkonium production in proton-proton collisions at the LHC

    Nodoka Yamanaka🇫🇷 · Jean-Philippe Lansberg🇫🇷 · Hua-Sheng Shao🇫🇷 · Yu-Jie Zhang🇨🇳

    The production process of quarkonia in proton-proton (pp) collision is a very good probe of the parton structure of the proton. Recent experimental data of the production of J/psi+vector boson or quarkonium pairs at the LHC and Tevatron suggest the relevance of double parton scatterings (DPS). We discuss here the single parton scattering (SPS) contribution to the J/psi +Z, J/psi +W, and J/psi +J/psi productions in hadron collisions. By revisiting the computations of the SPS contributions to the J/psi+Z and J/psi +W productions, we demonstrate that the ATLAS data in fact show evidence for DPS.

    ↳ hep-phhep-exnucl-exnucl-thPoS(2018)·0 citations

Affiliations

first authorsco-authorsvia INSPIRE