PaperPanorama
FAQ

Nuclear Theory·nucl-th

Thursday·October 24, 2019

10 papers—7 primary·3 cross-listed

All10Primary7Cross-lists3
  1. 08

    [Submitted on 22 Oct 2019] (cross-list from hep-ph)

    Power Counting the Small- Observables

    Zhong-Bo Kang🇺🇸 · Xiaohui Liu🇨🇳

    We emphasize the importance of applying power counting to the small- observables, which introduces novel soft contributions usually missing and allows for a unified treatment of the Balitsky-Kovchegov (BK) evolution and various Sudakov logarithms. We use at forward rapidity to highlight how the power counting yields a partonic cross section with collinear and soft sectors. We show how the kinematic constraints can be obtained in the soft sector without violating the power counting. We further show how one can resum the threshold Sudakov logarithms systematically to all orders in a re-factorized framework with additional collinear-soft contributions. Direct applications to other small- processes involving heavy particles, jet (sub-)observables and EIC physics are straightforward.

    Comments:
    5 pages, 2 figures, statements clarified and references added
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1910.10166 [pdf]
    13 citations
  2. 09

    [Submitted on 23 Oct 2019] (cross-list from hep-ph)

    baryon spectrum and their decays in a constituent quark model

    Ming-Sheng Liu🇨🇳 · Kai-Lei Wang🇨🇳 · Qi-Fang Lü🇨🇳 · Xian-Hui Zhong🇨🇳

    Combining the recent developments of the observations of sates we calculate the spectrum up to the shell within a nonrelativistic constituent quark potential model. Furthermore, the strong and radiative decay properties for the resonances within the shell are evaluated by using the masses and wave functions obtained from the potential model. It is found that the newly observed resonance is most likely to be the spin-parity -wave state , it also has a large potential to be observed in the channel. Our calculation shows that the 1-, 1-, and 2-wave baryons have a relatively narrow decay width of less than 50 MeV. Based on the obtained decay properties and mass spectrum, we further suggest optimum channels and mass regions to find the missing resonances via the strong and/or radiative decay processes.

    Comments:
    12 pages, 1 figure
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    1910.10322 [pdf]
    PRD(2020)·57 citations
  3. 10

    [Submitted on 23 Oct 2019] (cross-list from hep-ph)

    The evolution of Information entropy components in Relativistic Heavy-Ion Collisions

    Fei Li🇨🇳 · Gang Chen🇨🇳

    Shannon information entropy provides an effective tool to study the evolution process in relativistic heavy-ion collisions. The time evolution process of thermodynamic entropy , multiple entropy , and configuration entropy at RHIC is studied using the AMPT model to generate central Au-Au collisions. By superimposing the three kinds of information entropy, we can get a more complete information entropy of the system to describe the physical information of the relativistic heavy ion collision. The results show that the four stages of the time evolution process of the system entropy seem to correspond to the four physical processes in the relativistic heavy ion collision, indicating that the total entropy of the system can reflect the physical information in the relativistic heavy ion collision more accurately.

    Comments:
    7 pages,8 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1910.10420 [pdf]
    EPJA(2020)·6 citations

Affiliations

first authorsco-authorsvia INSPIRE