PaperPanorama
FAQ

Nuclear Theory·nucl-th

Monday·June 6, 2016

5 papers—3 primary·2 cross-listed

All5Primary3Cross-lists2
  1. 04

    [Submitted on 3 Jun 2016] (cross-list from hep-ph)

    Dibaryons with two strange quarks and one heavy flavor in a constituent quark model

    Aaron Park🇰🇷 · Woosung Park🇰🇷 · Su Houng Lee🇰🇷

    We investigate the symmetry property and the stability of dibaryons containing two strange quarks and one heavy flavor with . We construct the wave function of the dibaryon in two ways. First, we directly construct the color and spin state of the dibaryon starting from the four possible SU(3) flavor state. Second, we consider the states composed of five light quarks, and then construct the wave function of the dibaryon by adding one heavy quark. The stability of the dibaryon against the strong decay into two baryons is discussed by using variational method in a constituent quark model with confining and hyperfine potential. We find that for all configurations with S=0,1,2, the ground states of the dibaryons are the sum of two baryons, and there are no compact bound state that is stable against the strong decay.

    Comments:
    36 pages, 1 figure
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1606.01006 [pdf]
    PRD(2016)·21 citations
  2. 05

    [Submitted on 3 Jun 2016] (cross-list from hep-ph)

    Two-gluon exchange contribution to elastic scattering and production of two-photons in ultraperipheral ultrarelativistic heavy ion and proton-proton collisions

    Mariola Klusek-Gawenda🇵🇱 · Wolfgang Schaefer🇵🇱 · Antoni Szczurek🇵🇱

    We discuss the two-gluon exchange contribution (formally three-loops) to elastic photon-photon scattering in the high-energy approximation. The elastic amplitude is given in the impact-factor representation for all helicity configurations and finite quark masses. We discuss the importance of including the charm quark, which contribution, due to interference, can enhance the cross section considerably. We investigate the contribution to the amplitude from the soft region, by studying its dependence on nonperturbative gluon mass. Helicity-flip contributions are shown to be much smaller than helicity-conserving ones. We identify region(s) of phase space where the two-gluon exchange contribution becomes important ingredient compared to box and nonperturbative VDM-Regge mechanisms considered in the literature. Consequences for the reaction are discussed. Several differential distributions are shown. A feasibility study to observe the effect of two-gluon exchange is presented. We perform a similar analysis for the reaction. Only by imposing severe cuts on and a narrow window on photon transverse momenta the two gluon contribution becomes comparable to the box contribution but the corresponding cross section is rather small.

    Comments:
    15 pages, 16 figures, 1 table, a reference was added
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    1606.01058 [pdf]
    PLB(2016)·38 citations

Affiliations

first authorsco-authorsvia INSPIRE