Nuclear Theory·nucl-th

Monday·December 26, 2022

8 papers—1 primary·7 cross-listed

02
Precision Studies of QCD in the Low Energy Domain of the EIC
V. Burkert · L. Elouadrhiri · A. Afanasev · J. Arrington · M. Contalbrigo · W. Cosyn · A. Deshpande · D. Glazier · X. Ji · S. Liuti · Y. Oh · D. Richards · T. Satogata · A. Vossen
The manuscript focuses on the high impact science of the EIC with objective to identify a portion of the science program for QCD precision studies that requires or greatly benefits from high luminosity and low center-of-mass energies. The science topics include (1) Generalized Parton Distributions, 3D imagining and mechanical properties of the nucleon (2) mass and spin of the nucleon (3) Momentum dependence of the nucleon in semi-inclusive deep inelastic scattering (4) Exotic meson spectroscopy (5) Science highlights of nuclei (6) Precision studies of Lattice QCD in the EIC era (7) Science of far-forward particle detection (8) Radiative effects and corrections (9) Artificial Intelligence (10) EIC interaction regions for high impact science program with discovery potential. This paper documents the scientific basis for supporting such a program and helps to define the path toward the realization of the second EIC interaction region.
↳ nucl-exhep-exhep-lathep-ph+1PPNP(2023)·95 citations
03
Proton spin, topology and confinement: lessons from QCD $_{2}$
David Frenklakh🇺🇸
We investigate the relation between the topology of a nucleon and its spin composition. We approach this question in (1+1) dimensional single-flavor QCD with a large number of color. In this limit the theory can be shown to be dual to the exactly solvable sine-Gordon model. The spectrum of baryons and mesons is known analytically, and the baryon is a topological kink of the sine-Gordon model. Using the method of solitonic constituents we construct the state of the baryon and extract its $g_{1}$ structure function. Due to the topological nature of the baryon state this structure function is enhanced at low Bjorken $x$ . We propose this enhancement as an experimental probe of the topological structure of the nucleon state.
↳ hep-phhep-thnucl-th0 citations
04
Chiral Nonet Mixing in $π η$ Scattering
Amir H. Fariborz🇺🇸 · Soodeh Zarepour🇮🇷 · Esmaiel Pourjafarabadi🇮🇷 · S. Mohammad Zebarjad🇮🇷
The generalized linear sigma model for mixing among two- and four-quark components of scalar (and psedudosclar) mesons below and above 1 GeV is applied to the $π η$ channel in which the isovector scalars $a_{0} (980)$ and $a_{0} (1450)$ are probed. In the leading order, the model parameters have been previously fixed by various low-energy experimental data, and then applied to $π π$ and $π K$ channels in which the properties of the light and broad $σ$ and $κ$ mesons are extracted in agreement with estimates reported in the literature. With the same parameters fixed in the leading order, in the present work the prediction of the model for the $π η$ scattering amplitude in the elastic region is given and unitarized with the K-matrix method. The poles of the unitarized scattering amplitude, which determine the mass and decay width of $a_{0} (980)$ and $a_{0} (1450)$ are computed. It is found that the model predicts an isovector scalar state below 1 GeV, with mass 984 $\pm$ 6 MeV and decay width 108 $\pm$ 30 MeV which is a clear signal for the $a_{0} (980)$ . The $a_{0}$ pole extracted in this work, further supports the plausibility of the mixing patterns for scalar mesons predicted by this model according to which there is a significant underlying mixing among scalars below and above 1 GeV, with those below 1 GeV being generally of four-quark nature while those above 1 GeV being overall closer to quark-antiquark states. Predictions for various scattering lengths as well as for properties of $a_{0} (1450)$ are also presented.
↳ hep-phhep-exnucl-thEPJC(2022)·4 citations
05
Comprehensive Study of Multi-scale Jet-medium Interaction
Y. Tachibana🇯🇵 · A. Angerami · R. Arora · S. A. Bass · S. Cao · Y. Chen · T. Dai · L. Du · R. Ehlers · H. Elfner · W. Fan · R. J. Fries and 46 other authors
We explore jet-medium interactions at various scales in high-energy heavy-ion collisions using the JETSCAPE framework. The physics of the multi-stage modeling and the coherence effect at high virtuality is discussed through the results of multiple jet and high- $p_{T}$ particle observables, compared with experimental data. Furthermore, we investigate the jet-medium interaction involved in the hadronization process.
↳ hep-phnucl-thActa Phys.Polon.Supp.(2023)·1 citation
06
A new look at the $P_{cs}$ states from a molecular perspective
Albert Feijoo🇪🇸 · Wen-Fei Wang🇪🇸 · Chu-Wen Xiao🇨🇳 · Jia-Jun Wu🇨🇳 · Eulogio Oset🇪🇸 · Juan Nieves🇪🇸 · Bing-Song Zou🇨🇳
We have a look at the $P_{cs}$ states generated from the interaction of $D ˉ^{(*)} Ξ_{c}^{(' *)}$ coupled channels. We consider the blocks of pseudoscalar-baryon $(\frac{1}{2}^{+}, \frac{3}{2}^{+})$ and vector-baryon $(\frac{1}{2}^{+}, \frac{3}{2}^{+})$ , and find $10$ resonant states coupling mostly to $D ˉ Ξ_{c}, D ˉ^{*} Ξ_{c}, D ˉ Ξ_{c}^{'}, D ˉ^{*} Ξ_{c}^{'}, D ˉ Ξ_{c}^{*}$ and $D ˉ^{*} Ξ_{c}^{*}$ . A novel aspect of the work is the realization that the $D ˉ Ξ_{c}, D ˉ_{s} Λ_{c}$ or $D ˉ^{*} Ξ_{c}, D ˉ_{s}^{*} Λ_{c}$ channels, with a strong transition potential, collaborate to produce a larger attraction than the corresponding states $D ˉ Σ_{c}, D ˉ Λ_{c}$ or $D ˉ^{*} Σ_{c}, D ˉ^{*} Λ_{c}$ appearing in the generation of the strangenessless $P_{c}$ states, since in the latter case the transition potential between those channels is zero. The extra attraction obtained in the $D ˉ Ξ_{c}, D ˉ^{*} Ξ_{c}$ pairs preclude the association of these channels to the $P_{cs} (4338)$ and $P_{cs} (4459)$ states respectively. Then we find a natural association of the $P_{cs} (4338)$ state coupling mostly to $D ˉ^{*} Ξ_{c}$ while the $P_{cs} (4459)$ is associated to the state found that couples mostly to $D ˉ Ξ_{c}^{'}$ . Four more states appear, like in other molecular pictures, and some of the states are degenerate in spin. Counting different spin states we find $10$ states, which we hope can be observed in the near future.
↳ hep-phhep-exhep-latnucl-thPLB(2023)·56 citations
07
Medium modifications of Heavy Quarkonia masses in a generalized Linear Sigma Model
Arpita Mondal🇮🇳 · Pallabi Parui🇮🇳 · Amruta Mishra🇮🇳
We study the mass shifts of the charmonium ( $c ˉ c$ ) states ( $J / ψ$ , $ψ (2 S)$ , $ψ (1 D)$ , $χ_{c 0}$ , $χ_{c 1}$ and $χ_{c 2}$ ) as well as the bottomonium ( $b ˉ b$ ) states ( $Υ (1 S)$ , $Υ (2 S)$ , $Υ_{2} (1 D)$ , $χ_{b 0}$ , $χ_{b 1}$ and $χ_{b 2}$ ) in isospin asymmetric nuclear matter. These are investigated using a generalized linear sigma model. The broken scale invariance of QCD is incorporated in the chiral $S U (2) \times S U (2)$ Lagrangian through an effective potential involving logarithmic terms of a scalar (glueball) dilaton field $χ$ . The mass shifts of the quarkonium states are obtained through the medium modifications of the dilaton field which simulates the scalar gluon condensate of QCD. We observe an appreciable mass drop in the states of heavy quarkonia under this study. The in-medium masses at finite densities thus obtained should modify the in-medium partial decay widths of heavy quarkonia to open heavy flavor mesons. These density effects can be probed in in the high energy nuclear collisions at the future facility at GSI (at Germany) and JINR (at Russia) in the experiments producing highly dense baryonic matter.
↳ hep-phnucl-th1 citation
08
Implications of gradient flow on the static force
Nora Brambilla🇩🇪 · Viljami Leino🇩🇪 · Julian Mayer-Steudte🇩🇪 · Antonio Vairo🇩🇪
We use gradient flow to compute the static force based on a Wilson loop with a chromoelectric field insertion. The result can be compared on one hand to the static force from the numerical derivative of the lattice static energy, and on the other hand to the perturbative calculation, allowing a precise extraction of the $Λ_{0}$ parameter. This study may open the way to gradient flow calculations of correlators of chromoelectric and chromomagnetic fields, which typically arise in the nonrelativistic effective field theory factorization.
↳ hep-lathep-thnucl-thPoS(2023)·5 citations

Affiliations

first authorsco-authorsvia INSPIRE

Precision Studies of QCD in the Low Energy Domain of the EIC

Proton spin, topology and confinement: lessons from QCD2​

Chiral Nonet Mixing in πη Scattering

Comprehensive Study of Multi-scale Jet-medium Interaction

A new look at the Pcs​ states from a molecular perspective

Medium modifications of Heavy Quarkonia masses in a generalized Linear Sigma Model

Implications of gradient flow on the static force

Affiliations

Proton spin, topology and confinement: lessons from QCD $_{2}$

Chiral Nonet Mixing in $π η$ Scattering

A new look at the $P_{cs}$ states from a molecular perspective