Nuclear Theory·nucl-th

Wednesday·December 15, 2021

13 papers—3 primary·10 cross-listed

01
[Submitted on 14 Dec 2021]
Structure of two- and three-alpha systems in cold neutron matter
H. Moriya · H. Tajima · W. Horiuchi · K. Iida · E. Nakano
We present stability and structure of two- and three-alpha systems embedded in dilute cold neutron matter. By solving a few-alpha Schrödinger equation with quasiparticle properties, i.e., effective mass and induced two- and three-alpha interactions, which are evaluated in terms of Fermi polarons, it is shown that $^{8} Be$ and the Hoyle state become bound at densities of about $1 0^{- 4}$ and $1 0^{- 3}$ of the saturation density, respectively. It is also seen that, under cold neutron matter environment, both systems become smaller than the corresponding systems in vacuum. Our results would affect astrophysical models for stellar collapse and neutron star mergers, as well as relevant reaction rates for nucleosynthesis.
Comments:
3 pages, 1 figure, contribution to the 16th International Symposium on Nuclei in the Cosmos (NIC-XVI), 21-25 Sep. 2021
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2112.07113 [pdf]
EPJ Web Conf.(2022)·0 citations
02
[Submitted on 14 Dec 2021]
Estimation of transport coefficients of dense hadronic and quark matter
Debashree Sen🇮🇳 · Naosad Alam🇮🇳 · Sabyasachi Ghosh🇮🇳
We calculate the transport coefficients like shear viscosity and electrical conductivity with respect to density of dense hadronic and quark matter. By considering the simple massless limit for the quark matter and two different effective models for the hadronic matter, we have estimated the transport coefficients of the two phases separately. We have sketched the density profile of the transport coefficients in two parts viz. the phase-space part and the relaxation time part. By calculating the shear viscosity to density ratio, we have also explored the nearly perfect fluid domain of the quark and hadronic matter.
Comments:
22 pages, 7 figures; Accepted for Publication in Chinese Physics C
Subjects:
Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
arXiv:
2112.07404 [pdf]
CPC(2023)·4 citations
03
[Submitted on 14 Dec 2021]
Embedding a critical point in a hadron to quark-gluon crossover equation of state
J. I. Kapusta🇺🇸 · C. Plumberg🇺🇸 · T. Welle🇺🇸
Lattice QCD simulations have shown unequivocally that the transition from hadrons to quarks and gluons is a crossover when the baryon chemical potential is zero or small. Many model calculations predict the existence of a critical point at a value of the chemical potential where current lattice simulations are unreliable. We show how to embed a critical point in a smooth background equation of state so as to yield the critical exponents and critical amplitude ratios expected of a transition in the same universality class as the liquid-gas phase transition and the 3D Ising model. The resulting equation of state has parameters which may be inferred by hydrodynamic modeling of heavy ion collisions in the Beam Energy Scan II at the Relativistic Heavy Ion Collider or in experiments at other accelerators.
Comments:
4 pages, 4 figures
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
2112.07563 [pdf]
Acta Phys.Polon.Supp.(2023)·15 citations
04
[Submitted on 13 Dec 2021] (cross-list from hep-ph)
Jet quenching in glasma
Margaret E. Carrington🇨🇦 · Alina Czajka🇵🇱 · Stanislaw Mrowczynski🇵🇱
We discuss the transverse momentum broadening of hard probes traversing an evolving glasma, which is the earliest phase of the matter produced in relativistic heavy-ion collisions. The coefficient $q^$ is calculated using the Fokker-Planck equation, and an expansion in the proper time $τ$ which is applied to describe the temporal evolution of the glasma. The correlators of the chromodynamic fields that determine the Fokker-Planck collision term, which in turn provides $q^$ , are computed to fifth order in $τ$ . The momentum broadening is shown to rapidly grow in time and reach a magnitude of several $Ge V^{2} /fm$ . We show that the transient pre-equilibrium phase provides a contribution to the energy loss of hard probes which is comparable to that of the long lasting, hydrodynamically evolving, equilibrium phase.
Comments:
5 pages, 3 figures, estimate of gauge dependence included, final version
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2112.06812 [pdf]
PLB(2022)·68 citations
05
[Submitted on 13 Dec 2021] (cross-list from hep-ph)
Mixed leptonic and hadronic corrections to the anomalous magnetic moment of the muon
Martin Hoferichter🇨🇭 · Thomas Teubner🇬🇧
Higher-order hadronic corrections to the anomalous magnetic moment of the muon have been evaluated including next-to-next-to-leading-order insertions of hadronic vacuum polarization and next-to-leading-order corrections to hadronic light-by-light scattering. This leaves a set of mixed leptonic and hadronic corrections in the form of double-bubble topologies as the only remaining hadronic effect at $O (α^{4})$ . Here, we estimate these contributions by analyzing the respective cuts of the diagrams, suggesting that the impact is limited to $≲ 1 \times 1 0^{- 11}$ and thus negligible at the level of the final precision of the Fermilab $g - 2$ experiment.
Comments:
7 pages, 2 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
arXiv:
2112.06929 [pdf]
PRL(2022)·36 citations
06
[Submitted on 13 Dec 2021] (cross-list from cond-mat.quant-gas)
Probe for bound states of SU(3) fermions and colour deconfinement
Wayne J. Chetcuti🇮🇹 · Juan Polo🇦🇪 · Andreas Osterloh🇦🇪 · Paolo Castorina🇮🇹 · Luigi Amico🇮🇹
Fermionic artificial matter realized with cold atoms grants access to an unprecedented degree of control on sophisticated many-body effects with an enhanced flexibility of the operating conditions. We consider three-component fermions with attractive interactions to study the formation of complex bound states whose nature goes beyond the standard fermion pairing occurring in quantum materials. Such systems display clear analogies with quark matter. Here, we address the nature of the bound states of a three-component fermionic system in a ring-shaped trap through the persistent current. In this way, we demonstrate that we can distinguish between color superfluid and trionic bound states. By analyzing finite temperature effects, we show how finite temperature can lead to the deconfinement of bound states. For weak interactions the deconfinement occurs because of scattering states. In this regime, the deconfinement depends on the trade-off between interactions and thermal fluctuations temperature. For strong interactions the features of the persistent current result from the properties of a suitable gas of bound states.
Comments:
19 pages, 20 figures
Subjects:
Quantum Gases (cond-mat.quant-gas); Mesoscale and Nanoscale Physics (cond-mat.mes-hall); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
arXiv:
2112.06950 [pdf]
Commun.Phys.(2023)·18 citations
07
[Submitted on 13 Dec 2021] (cross-list from hep-ph)
Pursuing the Precision Study for Color Glass Condensate in Forward Hadron Productions
Yu Shi🇨🇳 · Lei Wang🇨🇳 · Shu-Yi Wei🇨🇳 · Bo-Wen Xiao🇨🇳
With the tremendous accomplishments of RHIC and the LHC experiments and the advent of the future Electron-Ion Collider on the horizon, the quest for compelling evidence of the color glass condensate (CGC) has become one of the most aspiring goals in the high energy Quantum Chromodynamics research. Pursuing this question requires developing the precision test of the CGC formalism. By systematically implementing the threshold resummation, we significantly improve the stability of the next-to-leading-order calculation in CGC for forward rapidity hadron productions in $pp$ and $p A$ collisions, especially in the high $p_{T}$ region, and obtain reliable descriptions of all existing data measured at RHIC and the LHC across all $p_{T}$ regions. Consequently, this technique can pave the way for the precision studies of the CGC next-to-leading-order predictions by confronting them with a large amount of precise data.
Comments:
7 pages (main text) plus 35 pages (supplemental material), 20 figures; v2, minor addition
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2112.06975 [pdf]
PRL(2022)·64 citations
08
[Submitted on 13 Dec 2021] (cross-list from hep-ph)
Detecting inhomogeneous chiral condensation from the bosonic two-point function in the $(1 + 1)$ -dimensional Gross-Neveu model in the mean-field approximation
Adrian Koenigstein🇩🇪 · Laurin Pannullo🇩🇪 · Stefan Rechenberger🇩🇪 · Martin J. Steil🇩🇪 · Marc Winstel🇩🇪
The phase diagram of the $(1 + 1)$ -dimensional Gross-Neveu model is reanalyzed for (non-)zero chemical potential and (non-)zero temperature within the mean-field approximation. By investigating the momentum dependence of the bosonic two-point function, the well-known second-order phase transition from the $Z_{2}$ symmetric phase to the so-called inhomogeneous phase is detected. In the latter phase the chiral condensate is periodically varying in space and translational invariance is broken. This work is a proof of concept study that confirms that it is possible to correctly localize second-order phase transition lines between phases without condensation and phases of spatially inhomogeneous condensation via a stability analysis of the homogeneous phase. To complement other works relying on this technique, the stability analysis is explained in detail and its limitations and successes are discussed in context of the Gross-Neveu model. Additionally, we present explicit results for the bosonic wave-function renormalization in the mean-field approximation, which is extracted analytically from the bosonic two-point function. We find regions -- a so-called moat regime -- where the wave function renormalization is negative accompanying the inhomogeneous phase as expected.
Comments:
27 pages (main text 20, appendix 7), 2 tables, 13 figures (plot data included in arXiv source file); Updated, published version
Subjects:
High Energy Physics — Phenomenology (hep-ph); Strongly Correlated Electrons (cond-mat.str-el); Nuclear Theory (nucl-th)
arXiv:
2112.07024 [pdf]
J.Phys.A(2022)·45 citations
09
[Submitted on 13 Dec 2021] (cross-list from hep-lat)
Bottomonia screening masses from $2 + 1$ flavor QCD
Peter Petreczky🇺🇸 · Sayantan Sharma🇮🇳 · Johannes Heinrich Weber🇩🇪
The sequential melting of the bottomonium states is one of the important signals for the existence of a quark gluon plasma. The study of bottomonia spectral functions on the lattice is a difficult task for many reasons. Calculations based on NRQCD, that are commonly used for such purpose, are not applicable at high temperatures. In this work we propose a new method to study this problem by calculating the spatial screening masses of bottomonium states. We calculate the spatial meson correlators and extract the screening masses for mesons in different quantum channels using highly improved staggered quark (HISQ) action for bottom quarks and dynamical $2 + 1$ flavor QCD HISQ gauge configurations. The typical lattices we choose are of size $N_{s}^{3} \times N_{τ}$ where $N_{s} = 4 N_{τ}$ and $N_{τ} = 8, 10, 12$ . We consider the temperature range $T = 300$ - $1000$ MeV. We show that for $T > 500$ MeV the temperature dependence of the screening masses of the ground state bottomonia are compatible with the expectations based on uncorrelated quark anti-quark pairs.
Comments:
9 pages, 3 figures, contribution to the 38th International Symposium on Lattice Field Theory, Lattice 2021, 26-30th July, 2021, Zoom/Gather@Massachusetts Institute of Technology
Subjects:
High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2112.07043 [pdf]
1 citation
10
[Submitted on 14 Dec 2021] (cross-list from hep-ph)
Dilepton Helical Production in a Vortical Quark-Gluon Plasma
Lihua Dong🇨🇳 · Shu Lin🇨🇳
In this paper, we propose an observable counting a weighted difference between right-handed and left-handed lepton pairs, which is coined dilepton helical rate. The weight is the momentum difference of the lepton pairs projected onto an auxiliary vector. We derive the helical rate in a quark-gluon plasma with a vorticity in the limit when the quark and lepton masses are ignored. We find the helical rate is maximized when the auxiliary vector is parallel to the vorticity, in which case it has a nearly spherical oblate ellipsoidal distribution. We propose that it can be used as a vortical-meter for quark-gluon plasma.
Comments:
19 pages, 4 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2112.07153 [pdf]
EPJA(2022)·10 citations
11
[Submitted on 14 Dec 2021] (cross-list from cond-mat.quant-gas)
Pairing patterns in polarized unitary Fermi gases above the superfluid transition
Felipe Attanasio🇩🇪 · Lukas Rammelmüller🇩🇪 · Joaquín E. Drut🇺🇸 · Jens Braun🇩🇪
We non-perturbatively study pairing in the high-temperature regime of polarized unitary two-component Fermi gases by extracting the pair-momentum distribution and shot-noise correlations. Whereas the pair-momentum distribution allows us to analyze the propagation of pairs composed of one spin-up and one spin-down fermion, shot-noise correlations provide us with a tomographic insight into pairing correlations around the Fermi surfaces associated with the two species. Assuming that the dominant pairing patterns right above the superfluid transition also govern the formation of condensates in the low-temperature regime, our analysis suggests that the superfluid ground state is homogeneous and of the Bardeen-Cooper-Schrieffer-type over a wide range of polarizations.
Comments:
6 pages, 4 figures
Subjects:
Quantum Gases (cond-mat.quant-gas); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
arXiv:
2112.07309 [pdf]
PRA(2022)·9 citations
12
[Submitted on 14 Dec 2021] (cross-list from hep-lat)
Nucleon Helicity Generalized Parton Distribution at Physical Pion Mass from Lattice QCD
Huey-Wen Lin🇺🇸
The generalized parton distributions (GPDs) offer a window on three-dimensional imaging of the nucleon, providing understanding of how the fundamental properties of the nucleon, such as its mass and spin, arise from the underlying quark and gluon degrees of freedom. In this work, we present the first lattice calculation of the nucleon isovector helicity GPD at physical pion mass, using an $a \approx 0.09$ fm lattice ensemble with 2+1+1 flavors of highly improved staggered quarks generated by MILC Collaboration. We perform the GPD calculation in Breit frame using averaged nucleon boost momentum $P_{z} \approx 2.2$ GeV with nonzero momentum transfers in $[0.2, 1.0] GeV^{2}$ . Nonperturbative renormalization in RI/MOM scheme is used to obtain the quasi-distribution before matching to the lightcone GPDs. The three-dimensional distribution $H ~ (x, Q^{2})$ is presented, along with the three-dimensional nucleon tomography and impact-parameter--dependent distribution for selected Bjorken $x$ at $μ = 3$ GeV in $MS$ scheme.
Comments:
9 pages, 6 figures
Subjects:
High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2112.07519 [pdf]
PLB(2022)·88 citations
13
[Submitted on 14 Dec 2021] (cross-list from hep-ph)
QCD at high temperature and density: selected highlights
Jon-Ivar Skullerud🇮🇪
I review some of the recent progress in QCD at high temperature and density, with a focus on the nature of the high-temperature transition; cold and dense matter; and hadron properties and transport coefficients at high temperature.
Comments:
12 pages, 8 figures. Plenary presentation at A virtual tribute to Quark Confinement and the Hadron Spectrum, 2-6 August 2021
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
arXiv:
2112.07595 [pdf]
EPJ Web Conf.(2022)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE