Nuclear Theory·nucl-th

Wednesday·May 3, 2017

6 papers—3 primary·3 cross-listed

04
Hadronic molecules
Feng-Kun Guo🇨🇳 · Christoph Hanhart🇩🇪 · Ulf-G. Meißner🇩🇪 · Qian Wang🇩🇪 · Qiang Zhao🇨🇳 · Bing-Song Zou🇨🇳
A large number of experimental discoveries especially in the heavy quarkonium sector that did not at all fit to the expectations of the until then very successful quark model led to a renaissance of hadron spectroscopy. Among various explanations of the internal structure of these excitations, hadronic molecules, being analogues of light nuclei, play a unique role since for those predictions can be made with controlled uncertainty. We review experimental evidences of various candidates of hadronic molecules, and methods of identifying such structures. Nonrelativistic effective field theories are the suitable framework for studying hadronic molecules, and are discussed in both the continuum and finite volumes. Also pertinent lattice QCD results are presented. Further, we discuss the production mechanisms and decays of hadronic molecules, and comment on the reliability of certain assertions often made in the literature.
↳ hep-phhep-exhep-latnucl-thRMP(2018)·1678 citations
05
Polyakov loop modeling for hot QCD
Kenji Fukushima🇯🇵 · Vladimir Skokov🇺🇸
We review theoretical aspects of quantum chromodynamics (QCD) at finite temperature. The most important physical variable to characterize hot QCD is the Polyakov loop, which is an approximate order parameter for quark deconfinement in a hot gluonic medium. Additionally to its role as an order parameter, the Polyakov loop has rich physical contents in both perturbative and non-perturbative sectors. This review covers a wide range of subjects associated with the Polyakov loop from topological defects in hot QCD to model building with coupling to the Polyakov loop.
↳ hep-phhep-lathep-thnucl-thPPNP(2017)·164 citations
06
Multiparticle collectivity from initial state correlations in high energy proton-nucleus collisions
Kevin Dusling🇺🇸 · Mark Mace🇺🇸 · Raju Venugopalan🇺🇸
Qualitative features of multiparticle correlations in light-heavy ion ( $p + A$ ) collisions at RHIC and LHC are reproduced in a simple initial state model of partons in the projectile coherently scattering off localized domains of color charge in the heavy nuclear target. These include i) the ordering of the magnitudes of the azimuthal angle $n$ th Fourier harmonics of two-particle correlations $v_{n} {2}$ , ii) the energy and transverse momentum dependence of the four-particle Fourier harmonic $v_{2} {4}$ , and iii) the energy dependence of four-particle symmetric cumulants measuring correlations between different Fourier harmonics. Similar patterns are seen in an Abelian version of the model, where we observe $v_{2} {2} > v_{2} {4} \approx v_{2} {6} \approx v_{2} {8}$ of two, four, six, and eight particle correlations. While such patterns are often interpreted as signatures of collectivity arising from hydrodynamic flow, our results provide an alternative description of the multiparticle correlations seen in $p + A$ collisions.
↳ hep-phnucl-exnucl-thPRL(2018)·100 citations

Affiliations

first authorsco-authorsvia INSPIRE

Hadronic molecules

Polyakov loop modeling for hot QCD

Multiparticle collectivity from initial state correlations in high energy proton-nucleus collisions

Affiliations