Nuclear Theory·nucl-th

Friday·October 5, 2018

9 papers—5 primary·4 cross-listed

01
Net-baryon multiplicity distribution consistent with lattice QCD
Adam Bzdak🇵🇱 · Volker Koch🇺🇸
We determine the net-baryon multiplicity distribution which reproduces all cumulants measured so far by lattice QCD. We present the dependence on the volume and temperature of this distribution. We find that for temperatures and volumes encountered in heavy ion reactions, the multiplicity distribution is very close to the Skellam distribution, making the experimental determination of it rather challenging. We further provide estimates for the statistics required to measure cumulants of the net-baryon and net-proton distributions.
nucl-thhep-exhep-phnucl-exPRC(2019)·6 citations
02
New Results on Three-Nucleon Short-Range Correlations
Misak Sargsian🇺🇸
The recent progress in studies of two-nucleon~(2N) short-range correlations~(SRCs) are reviewed with the main emphasize given to the observation of the strong dominance of proton-neutron~(pn) SRCs in nuclei as compared to proton-proton and neutron-neutron SRCs. Based on the pn SRC dominance a specific prediction is made for the dynamical structure of 3N- SRCs for inclusive $A (e, e^{'}) X$ reactions, according to which the 3N- SRCs are generated through the sequence of two short range $p n$ interactions. This allowed us to predict that the height of the plateau in the ratios of inclusive eA cross sections to that of $^{3} H e$ in the 3N-SRC region is related to the height of the plateau in the 2N-SRC region by a quadratic relation. The analysis of the available experimental data supports validity of such a relation.
nucl-th0 citations
03
The chiral vortical effect in Wigner function approach
Jian-hua Gao🇨🇳 · Jin-yi Pang🇩🇪 · Qun Wang🇨🇳
It is more subtle to obtain the chiral vortical effect (CVE) than chiral magnetic effect (CME) in quantum transport approach. To investigate the subtlty of the CVE we present two different derivation in the Wigner function approach. The first one is based on the method in our previous work \cite{Gao:2012ix} in which the CVE was derived under static-equilibrium conditions without details. We provide a detailed derivation using a more transparent and powerful method, which can be easily generalized to higher order calculation. In this derivation of the CVE current, there is an explicit Lorentz covariance. The second derivation is based on a more general chiral kinetic theory in a semi-classical expansion of the Wigner function without assuming static-equilibrium conditions \cite{Gao:2018wmr}. In this derivation, there is a freedom to choose a reference frame for the CVE current, so the explicit Lorentz covariance seems to be lost. Howerver, under static-equilibrium conditions, we show that the CVE current in this derivation can be decomposed into two parts, identified as the normal and magnetization current. Each part depends on the reference frame, but the sum of two parts does give the total CVE current which is independent of the reference frame. In the comoving frame of the fluid, it can be shown that the normal and magnetization current give one-third and two-thirds of the total CVE current respectively. This gives a natural solution to the 'one-third' puzzle in the CVE current in three-dimensional version of the chiral kinetic theory in the literature.
nucl-thPRD(2019)·46 citations
04
Nucleon-nucleon interaction in a chiral SU(3) quark model revisited
F. Huang🇨🇳 · W. L. Wang🇨🇳
A dynamical investigation of the nucleon-nucleon (NN) interaction by using the resonating group method (RGM) in a chiral SU(3) quark model has been revisited. The considered quark-quark interaction includes, besides the one-gluon exchange (OGE) and the phenomenological confinement potential, the nonet scalar and pseudoscalar meson exchanges derived from the spontaneous SU(3) chiral symmetry breaking. The physical consistency requirement that the wave functions of single baryons satisfy the minimums of the Hamiltonian has been strictly imposed in determination of the model parameters. The calculated masses of the octet and decuplet baryon ground states, the binding energy of the deuteron, and the NN scattering phase shifts up to a total angular momentum J=6 are in satisfactory agreement with the experiments.
nucl-thhep-phPRD(2018)·28 citations
05
Mansour three body force applied to nuclear matter
Hesham Mansour
In the present work we are going to add a correction to the BHF potential calculation by introducing a two- body density dependent potential that acts as a three body interaction. Adding the result of this potential to the BHF potential would give us new saturation curves which coincide with the results obtained from the experiment. We compute the energy per particle versus density curves for symmetric nuclear matter, pure neutron matter and the symmetry energy using modern nucleon nucleon potentials like CD Bonn.
nucl-th0 citations
06
Evolution of non-stationary pulses in a cold magnetized quark-gluon plasma
D. A. Fogaça🇧🇷 · R. Fariello🇧🇷 · F. S. Navarra🇧🇷 · Y. A. Stepanyants🇦🇺
We study weakly nonlinear wave perturbations propagating in a cold nonrelativistic and magnetized ideal quark-gluon plasma. We show that such perturbations can be described by the Ostrovsky equation. The derivation of this equation is presented for the baryon density perturbations. Then we show that the generalized nonlinear Schrödinger (NLS) equation can be derived from the Ostrovsky equation for the description of quasi-harmonic wave trains. This equation is modulationally stable for the wave number $k < k_{m}$ and unstable for $k > k_{m}$ , where $k_{m}$ is the wave number where the group velocity has a maximum. We study numerically the dynamics of initial wave packets with the different carrier wave numbers and demonstrate that depending on the initial parameters they can evolve either into the NLS envelope solitons or into dispersive wave trains.
↳ hep-phhep-thnucl-thCommun.Nonlinear Sci.Numer.Simul.(2020)·1 citation
07
Description of phi-meson production in hadronic and nuclear collisions at very high energies
G.H.Arakelyan🇦🇲 · C. Merino🇪🇸 · Yu.M. Shabelski🇷🇺
We expose the current experimental and theoretical situation of the interesting case of the production of phi mesons in up to very high energy collisions of hadrons on both nucleon and nuclear targets, and we present a quantitavely good theoretical description of the corresponding experimental data, based on the formalism of the well established Quark-Gluon String Model, that has proved to be valid for a wide energy range. All the available experimental data for phi-meson production in hadron-nucleon collisions on the spectra of secondary phi, and on the ratios of phi/pi(-) and phi/K(-) production cross sections, as well the corresponding ones for phi-meson production on nuclear targets, are considered. In particular, it is seen that the production of phi-mesons on nuclear targets presents unusually small shadow corrections for the inclusive density in the central rapidity region.
↳ hep-phnucl-thInt.J.Mod.Phys.A(2018)·3 citations
08
Realistic in-medium heavy-quark potential from high statistics lattice QCD simulations
Peter Petreczky🇺🇸 · Alexander Rothkopf🇳🇴 · Johannes Weber🇺🇸
We present our first results on a direct computation of the complex in-medium heavy quark potential from realistic lattice QCD simulations. Ensembles with $N_{τ} = 12$ from the HotQCD and TUMQCD collaboration offer unprecedented high statistics, those with $N_{τ} = 16$ unprecedented time resolution, making possible a robust extraction of the real part from the spectral functions of Wilson line correlators. To this end we deploy a combination of a Bayesian reconstruction (BR method), as well as a Padé-like approximation. We corroborate findings made on less realistic lattices that $Re [V]$ smoothly transitions from a confining to a screened behavior at high temperatures and its values lie close to the color singlet free energies. A finite value of the $Im [V]$ is observed in the quark-gluon-plasma phase.
↳ hep-lathep-phnucl-thNPA(2019)·33 citations
09
Holographic Bjorken Flow at Large-D
Jorge Casalderrey-Solana🇪🇸 · Christopher P. Herzog🇬🇧 · Ben Meiring🇬🇧
We use gauge/gravity duality to study the dynamics of strongly coupled gauge theories undergoing boost invariant expansion in an arbitrary number of space-time dimensions (D). By keeping the scale of the late-time energy density fixed, we explore the infinite-D limit and study the first few corrections to this expansion. In agreement with other studies, we find that the large-D dynamics are controlled by hydrodynamics and we use our computation to constrain the leading large-D dependence of a certain combination of transport coefficients up to 6-th order in gradients. Going beyond late time physics, we discuss how non-hydrodynamic modes appear in the large-D expansion in the form of a trans-series in D, identical to the non-perturbative contributions to the gradient expansion. We discuss the consequence of this trans-series in the non-convergence of the large-D expansion.
↳ hep-thhep-phnucl-thJHEP(2019)·18 citations

Affiliations

first authorsco-authorsvia INSPIRE