Nuclear Theory·nucl-th

Wednesday·July 19, 2023

17 papers—8 primary·9 cross-listed

09
Equation of State of Cold Quark Matter to $O (α_{s}^{3} ln α_{s})$
Tyler Gorda🇩🇪 · Risto Paatelainen🇫🇮 · Saga Säppi🇩🇪 · Kaapo Seppänen🇫🇮
Accurately understanding the equation of state (EOS) of high-density, zero-temperature quark matter plays an essential role in constraining the behavior of dense strongly interacting matter inside the cores of neutron stars. In this Letter, we study the weak-coupling expansion of the EOS of cold quark matter and derive the complete, gauge-invariant contributions from the long-wavelength, dynamically screened gluonic sector at next-to-next-to-next-to-leading order (N3LO) in the strong coupling constant $α_{s}$ . This elevates the EOS result to the $O (α_{s}^{3} ln α_{s})$ level, leaving only one unknown constant from the unscreened sector at N3LO, and places it on par with its high-temperature counterpart from 2003.
↳ hep-phastro-ph.HEnucl-thPRL(2023)·82 citations
10
Computing Jet Transport Coefficients On The Lattice
Amit Kumar🇩🇪 · Abhijit Majumder🇨🇦 · Ismail Soudi🇺🇸 · Johannes H. Weber🇺🇸
The leading jet transport coefficients $q^$ or $e^_{2}$ encode transverse or longitudinal momentum broadening of a hard parton traversing a hot medium. Understanding their temperature dependence is key to appreciating the observed suppression of high-transverse momentum probes at RHIC or LHC collision energies. We present a first continuum extrapolated result of $q^$ computed on pure SU(3) lattices with non-trivial temperature dependence different from the weak-coupling expectation. We discuss our formalism and its challenges and status in view of obtaining $e^_{2}$ or of unquenching the calculation. We consider a hard quark subject to a single scattering on the plasma. The transport coefficients are factorized in terms of matrix elements given as integrals of non-local gauge-covariant gluon field-strength field-strength correlators. After the analytic continuation to the deep-Euclidean region, the hard scale permits to recast these as a series of local, gauge-invariant operators. The renormalized leading-twist term in this expansion is closely related to static quantities, and is computed on pure SU(3) lattices ( $N_{τ} = 4, 6, 8,$ and $10$ ) for a wide range of temperatures, ranging from 200MeV < T < 1GeV. Our estimate for the unquenched result in $2 + 1$ -flavor QCD has very similar features.
↳ hep-lathep-phnucl-exnucl-thPoS(2024)·1 citation
11
A view of Coherent Elastic Neutrino-Nucleus Scattering
M. Cadeddu🇮🇹 · F. Dordei🇮🇹 · C. Giunti🇮🇹
We review the physics of coherent elastic neutrino-nucleus scattering and the results and perspectives for the measurements of the radius of the neutron distribution of the nucleus, of the weak mixing angle, and of new neutrino interactions due to physics beyond the Standard Model.
↳ hep-phhep-exnucl-exnucl-thEPL(2023)·34 citations
12
Triple Charmonium Production in pQCD
B. Blok🇮🇱 · J. Mehl (Technion)🇮🇱
We study the role of $1 \to 2$ and $1 \to 3$ processes in triple charmonium production. We see that the ratio of effective cross sections of TPS and DPS only moderately depends on charmonium transverse momenta, but the total DPS and TPS cross sections each separately may have rather strong dependence on charmonia transverse momenta in the central kinematics that can be studied experimentally.
↳ hep-phhep-exnucl-exnucl-thEPJC(2024)·1 citation
13
Universality of sound modes in kinetic theory
Xiaojian Du🇪🇸 · Stephan Ochsenfeld🇩🇪 · Sören Schlichting🇩🇪
We present a simple approach to extract hydrodynamic sound modes and non-hydrodynamic modes in kinetic theories from response functions of the energy-momentum tensor. By comparing the response functions in four types of kinetic theories, namely the Relaxation-Time Approximation, scalar $ϕ^{4}$ theory, SU(3) Yang-Mills theory and QCD kinetic theory, we find a remarkable degree of universality for the sound mode, even beyond the hydrodynamic regime.
↳ hep-phnucl-thPoS(2024)·1 citation
14
Theoretical study on $Λ_{c}^{+} \to Λ K^{+} K ˉ^{0}$ decay and $Ξ^{*} (1690)$ resonance
Si-Wei Liu🇨🇳 · Qing-Hua Shen🇨🇳 · Ju-Jun Xie🇨🇳
We present a theoretical study of $Ξ^{*} (1690)$ resonance in the $Λ_{c}^{+} \to Λ K^{+} K ˉ^{0}$ decay, where the weak interaction part proceeds through the Cabibbo-favored process $c \to s + u d ˉ$ . Next, the intermediate two mesons and one baryon state can be constructed with a pair of $q q ˉ$ with the vacuum quantum numbers. Finally, the $Ξ^{*} (1690)$ is mainly produced from the final state interactions of $K ˉ Λ$ in coupled channels, and it is shown in the $K ˉ Λ$ invariant mass distribution. Besides, the scalar meson $a_{0} (980)$ and nucleon excited state $N^{*} (1535)$ are also taken into account in the decaying channels $K^{+} K ˉ^{0}$ and $K^{+} Λ$ , respectively. Within model parameters, the $K^{+} K ˉ^{0}$ , $K ˉ^{0} Λ$ and $K^{+} Λ$ invariant mass distributions are calculated, and it is found that our theoretical results can reproduce well the experimental measurements, especially for the clear peak around $1690$ MeV in the $K ˉ Λ$ spectrum. The proposed weak decay process $Λ_{c}^{+} \to Λ K^{+} K ˉ^{0}$ and the interaction mechanism can provide valuable information on the nature of the $Ξ^{*} (1690)$ resonance.
↳ hep-phhep-exnucl-exnucl-thPRD(2023)·12 citations
15
Radiative energy loss of heavy quark through soft gluon emission in QGP
Taesoo Song🇩🇪 · Ilia Grishmanovskii🇩🇪 · Olga Soloveva🇩🇪 · Elena Bratkovskaya🇩🇪
The Low's theorem is applied to the soft gluon emission from heavy quark scattering in quark-gluon plasma (QGP). The QGP is described by the dynamical quasi-particle model (DQPM) which reproduces the EoS from lQCD at finite temperature and chemical potential. We show that if the emitted gluon is soft and of long wavelength, the scattering amplitude can be factorized into the scattering part and the emission part and the Slavnov-Taylor identities are satisfied in the leading order. Imposing a proper upper limit on the emitted gluon energy, we obtain the scattering cross sections of charm quark as well as the transport coefficients (momentum drag and diffusion) in the QGP with and without gluon emission.
↳ hep-phnucl-thPoS(2024)·0 citations
16
Quantum binding energies in the Skyrme model
Sven Bjarke Gudnason🇨🇳 · Chris Halcrow🇸🇪
A major problem in the Skyrme model is that the binding energy of skyrmions, which model nuclei, is too high by an order of magnitude. We show that the most popular solution to this problem, to construct models with zero classical binding energy, still produces large binding energies when spin energy is included. We argue that it is thus necessary to include quantum effects. We calculate the binding energy of skyrmions including the most simple quantum correction, that of vibrational modes in a harmonic approximation. We show that this can give physically reasonable results for nucleon numbers N=1-8 thanks to a remarkable cancellation between the strongly binding classical energy and the strongly unbinding zero-point energy from vibrational modes.
↳ hep-thnucl-thPLB(2024)·12 citations
17
Hard parton dispersion in the quark-gluon plasma, non-perturbatively
Jacopo Ghiglieri🇫🇷 · Guy D. Moore🇩🇪 · Philipp Schicho🇩🇪 · Niels Schlusser🇨🇭 · Eamonn Weitz🇫🇷
The in-medium dispersion of hard partons, encoded in their so-called asymptotic mass, receives large non-perturbative contributions from classical gluons, i.e. soft gluons with large occupation numbers. Here, we discuss how the analytical properties of thermal amplitudes allow for a non-perturbative determination of the infrared classical contribution through lattice determinations in the dimensionally-reduced effective theory of hot QCD, EQCD. We show how these lattice determinations need to be complemented by perturbative two-loop matching calculations between EQCD and QCD, so that the unphysical (classical) ultraviolet behavior of EQCD is replaced by its proper quantum QCD counterpart. We show how lattice and perturbative EQCD are in good agreement in the UV and present an outlook on the two-loop quantum QCD contribution.
↳ hep-phhep-latnucl-thPoS(2024)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE