The pressure distribution and shear forces inside the proton

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   Probing Nuclear Structure of Heavy Ions at the Large Hadron Collider

   Heikki Mäntysaari, Björn Schenke, Chun Shen et al. · 2024 · Physique nucléaire théorique · Résumé IA disponible

   Résumé scientifique

   We perform high-statistics simulations to study the impacts of nuclear structure on the ratios of anisotropic flow observables in $^{208}$Pb+$^{208}$Pb and $^{129}$Xe+$^{129}$Xe collisions at the Large Hadron Collider. Even with $40\%$ difference in atomic numbers between $^{208}$Pb and $^{129}$Xe nuclei, the ratios of anisotropic flow in the same centrality class between the two collision systems are strongly affected by the nuclear structure inputs in the initial state. The ratios of $v_2\{4\}/v_2\{2\}$ in these collisions are sensitive to the nuclear skin thickness of the colliding nuclei, providing indirect constraints on the nuclei's neutron skin. Our model predictions serve as a benchm…

2. Apparenté Pas pertinent

   Theory of Jet Quenching in Ultra-Relativistic Nuclear Collisions

   Guang-You Qin · 2014 · Physique nucléaire théorique · Résumé IA disponible

   Résumé scientifique

   We present a short overview of recent progress in the theory of jet quenching in ultra-relativistic nuclear collisions, including phenomenological studies of jet quenching at RHIC and the LHC, development in NLO perburbative QCD calculation of jet broadening and energy loss, full jet evolution and modification, medium response to jet transport, and lattice QCD and AdS/CFT studies of jet quenching.

3. Apparenté Pas pertinent

   Electromagnetic isoscalar rho-pi-gamma exchange current and the anomalous action

   E. Truhlik, J. Smejkal, F. C. Khanna · 2000 · Nucl.Phys. A689 (2001) 741-752 · Pas encore résumé

   Résumé scientifique

   Using modern data, we first refit constants needed to complete an anomalous pi-rho-omega-a_1 Lagrangian obtained within the approach of hidden local symmetries. Then we derive from this Lagrangian electromagnetic isoscalar rho-pi-gamma and rho-a_1-gamma currents needed in calculations of the deuteron electromagnetic form factors at large momentum transfers.

4. Apparenté Pas pertinent

   The Silver Blaze Problem in QCD

   Thomas D. Cohen · 2026 · Physique nucléaire théorique · Résumé IA disponible

   Résumé scientifique

   This article provides a pedagogical introduction to the Silver Blaze problem. This problem refers to the difficulty of reconciling to perspectives on QCD with a chemical potential. The first is the phenomenological fact that at $T=0$ QCD remains in its ground state -- the vacuum -- with all physical observables unchanged whenever the magnitude of a chemical potential is less than some critical value. The second is the fact that in functional integral treatments, the inclusion of any nonzero chemical potential changes all eigenvalues of the Dirac operator for every gauge configuration, leading to a natural expectation that the functional determinants also changes, which leads to the expectati…

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   Dileptons Get Nearly "Blind" to Mass-Scaling Effects In Hot and/or Dense Matter

   Mannque Rho · 2009 · Physique nucléaire théorique · Pas encore résumé

   Résumé scientifique

   Based on BHHRS and further sharpened by discussions with Gerry Brown that I had in October 2008, we arrive at the present assessment of the dilepton saga, namely, that dileptons become "blind" to changes in the vacuum structure of chiral symmetry (such as, e.g., BR scaling at high temperature and/or at high density and hence are {\em not} an appropriate probe for a signal for partial or complete chiral restoration, contrary to what has been widely believed. There, however, are a variety of indirect indications that the scaling notion is qualitatively, if not quantitatively, valid and should work in various low-energy nuclear phenomena, and it is fair to conclude that while there is no direct…

6. Apparenté Pas pertinent

   Multicomponent relativistic dissipative fluid dynamics from the Boltzmann equation

   Jan A. Fotakis, Etele Molnár, Harri Niemi et al. · 2022 · Physique nucléaire théorique · Résumé IA disponible

   Résumé scientifique

   We derive multicomponent relativistic second-order dissipative fluid dynamics from the Boltzmann equations for a reactive mixture of $N_{\text{spec}}$ particle species with $N_q$ intrinsic quantum numbers (e.g. electric charge, baryon number, and strangeness) using the method of moments. We obtain the continuity equations for multiple conserved charges as well as the conservation equations for the total energy and momentum in the single-fluid approximation. These $4+N_q$ conservation laws are closed by deriving the second-order equations of motion for the dissipative quantities in the $(10+4N_q)$-moment approximation. The resulting fluid-dynamical equations are formally similar to those of a…

7. Apparenté Pas pertinent

   Modeling the diffusive dynamics of critical fluctuations near the QCD critical point

   Marlene Nahrgang, Marcus Bluhm · 2020 · Phys. Rev. D 102, 094017 (2020) · Résumé IA disponible

   Résumé scientifique

   The experimental search for the QCD critical point by means of relativistic heavy-ion collisions necessitates the development of dynamical models of fluctuations. In this work we study the fluctuations of the net-baryon density near the critical point. Due to net-baryon number conservation the correct dynamics is given by the fluid dynamical diffusion equation, which we extend by a white noise stochastic term to include intrinsic fluctuations. We quantify finite resolution and finite size effects by comparing our numerical results to analytic expectations for the structure factor and the equal-time correlation function. In small systems the net-baryon number conservation turns out to be quan…

8. Apparenté Pas pertinent

   Models for photo- and electro-production of K^+ in view of new data

   P. Bydzovsky, F. Cusanno, S. Frullani et al. · 2003 · Physique nucléaire théorique · Pas encore résumé

   Résumé scientifique

   Predictions of isobaric and Regge models are compared with the latest experimental data (Bonn,JLab) to select among the models those providing a satisfactory description of the data. Only the Saclay-Lyon and MAID models are in a reasonable agreement with both photo- and electro-production data ranging up to about 2.5 GeV.