PaperPanorama
FAQ

Nuclear Theory·nucl-th

Friday·January 10, 2020

11 papers—6 primary·5 cross-listed

All11Primary6Cross-lists5
  1. 07

    Quantum delocalization of strings with boundary action in Yang-Mills theory

    A. S. Bakry🇨🇳 · M. A. Deliyergiyev🇨🇳 · A. A. Galal🇪🇬 · A. M. Khalaf🇪🇬 · M. Khalil William

    The width of the quantum delocalization of the QCD strings is investigated in effective string models beyond free Nambu-Goto approximation. We consider two Lorentzian-invariant boundary-terms in the Lüscher-Weisz string action in addition to self-interaction term equivalent to two loop order in the (NG) string action. The geometrical terms which realize the possible rigidity of the QCD string is scrutinized as well. We perform the numerical analysis on the 4-dim pure Yang-Mills lattice gauge theory at two temperature scales near deconfinement point. The comparative study with this QCD string model targets the width of the energy profile of a static quark-antiquark system for color sources separation fm. We find the inclusion of rigidity properties and symmetry effects of the boundary action into the string paradigm to reproduce a good match with the profile of the Mont-Carlo data of QCD flux-tube on this distance scale.

    ↳ hep-lathep-phhep-thnucl-th7 citations
  2. 08

    Systematics of direct- production with weakly and strongly bound projectiles

    V. V. Parkar · V. Jha · S. Kailas

    The production of -particles in reactions using both the strongly and weakly bound projectiles at energies around the Coulomb barrier show several interesting features. To understand these, the role of various reaction mechanisms responsible for -production, such as non-capture breakup, capture of only one of the fragments subsequent to projectile breakup and their contribution to reaction cross sections have been investigated. A systematic study of the -particle production based on available data for various projectile target systems have been performed and a classification based on projectile type is obtained.

    ↳ nucl-exnucl-th2 citations
  3. 09

    Lack of Debye and Meissner screening in strongly magnetized quark matter at intermediate densities

    Bo Feng🇨🇳 · Efrain J. Ferrer🇺🇸 · Israel Portillo🇺🇸

    We study the static responses of cold quark matter in the intermediate baryonic density region (characterized by a chemical potential ) in the presence of a strong magnetic field. We consider in particular, the so-called Magnetic Dual Chiral Density Wave (MDCDW) phase, which is materialized by an inhomogeneous condensate formed by a particle-hole pair. It is shown, that the MDCDW phase is more stable in the weak-coupling regime than the one considered in the magnetic catalysis of chiral symmetry braking phenomenon (MCSB) and even than the chiral symmetric phase that was expected to be realized at sufficiently high baryonic chemical potential. The different components of the photon polarization operator of the MDCDW phase in the one-loop approximation are calculated. We found that in the MDCDW phase there is no Debye screening neither Meissner effect in the lowest-Landau-level approximation. The obtained Debye length depends on the amplitude and modulation of the inhomogeneous condensate and it is only different from zero if the relation holds. But, we found that in the region of interest this inequality is not satisfied. Thus, no Debye screening takes place under those conditions. On the other hand, since the particle-hole condensate is electrically neutral, the U(1) electromagnetic group is not broken by the ground state and consequently there is no Meissner effect. These results can be of interest for the astrophysics of neutron stars.

    ↳ hep-phastro-ph.HEnucl-thPRD(2020)·14 citations
  4. 10

    Non-monotonic energy dependence of net-proton number fluctuations

    STAR Collaboration: J. Adam · L. Adamczyk · J. R. Adams · J. K. Adkins · G. Agakishiev · M. M. Aggarwal · Z. Ahammed · I. Alekseev · D. M. Anderson · A. Aparin · E. C. Aschenauer · M. U. Ashraf and 346 other authors

    Non-monotonic variation with collision energy () of the moments of the net-baryon number distribution in heavy-ion collisions, related to the correlation length and the susceptibilities of the system, is suggested as a signature for the Quantum Chromodynamics (QCD) critical point. We report the first evidence of a non-monotonic variation in kurtosis times variance of the net-proton number (proxy for net-baryon number) distribution as a function of \rootsnn with 3.1 significance, for head-on (central) gold-on-gold (Au+Au) collisions measured using the STAR detector at RHIC. Data in non-central Au+Au collisions and models of heavy-ion collisions without a critical point show a monotonic variation as a function of .

    ↳ nucl-exhep-exhep-phnucl-thPRL(2021)·377 citations
  5. 11

    Observed spectrum and meson-baryon molecular states

    Wei-Hong Liang🇨🇳 · E. Oset🇨🇳

    We observe that four peaks seen in the high energy part of the spectrum of the recent LHCb experiment are in remarkable agreement with predictions made for molecular states stemming from the meson-baryon interaction, with an approach that applied to the states gave rise to three states in good agreement with experiment in masses and widths. While the statistical significance of the peaks prevents us from claims of states at the present time, the agreement found should be an incentive to look at this experiment with increased statistics to give an answer to this suggestive idea.

    ↳ hep-phhep-exnucl-thPRD(2020)·23 citations

Affiliations

first authorsco-authorsvia INSPIRE