Nuclear Theory·nucl-th

Thursday·May 25, 2023

7 papers—3 primary·4 cross-listed

01
[Submitted on 24 May 2023]
Ab initio study of nuclear clustering in hot dilute nuclear matter
Zhengxue Ren · Serdar Elhatisari · Timo A. Lähde · Dean Lee · Ulf-G. Meißner
We present a systematic ab initio study of clustering in hot dilute nuclear matter using nuclear lattice effective field theory with an SU(4)-symmetric interaction. We introduce a method called light-cluster distillation to determine the abundances of dimers, trimers, and alpha clusters as a function of density and temperature. Our lattice results are compared with an ideal gas model composed of free nucleons and clusters. Excellent agreement is found at very low density, while deviations from ideal gas abundances appear at increasing density due to cluster-nucleon and cluster-cluster interactions. In addition to determining the composition of hot dilute nuclear matter as a function of density and temperature, the lattice calculations also serve as benchmarks for virial expansion calculations, statistical models, and transport models of fragmentation and clustering in nucleus-nucleus collisions.
Comments:
6+8 pages, 4+8 figures
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
2305.15037 [pdf]
PLB(2024)·37 citations
02
[Submitted on 24 May 2023]
Electric $1^{+}$ state below nuclear scissors
E.B. Balbutsev · I.V. Molodtsova
The solution of time dependent Hartree-Fock-Bogoliubov equations by the Wigner function moments method predicts four low-lying $1^{+}$ states. Three of them are known as various scissors modes. Fourth state is disposed below all scissors modes and has the electrical nature. It is found that it represents one of three branches of $2^{+}$ state which can exist in spherical nuclei and which is split in deformed nuclei. It is discovered, that the antiferromagnetic properties of nuclei lead to the splitting of $2^{+}$ states already at the zero deformation.
Comments:
20 pages, 5 figures, 2 tables
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2305.15039 [pdf]
EPJA(2023)·4 citations
03
[Submitted on 24 May 2023]
Systematic shell-model study for structure and isomeric states in $^{200 - 210}$ Po isotopes
Sakshi Shukla · Praveen C. Srivastava · Kosuke Nomura · Larry Zamick
We report systematic large-scale shell-model calculation for Po isotopes with $A =$ 200 to 210. We have performed calculations using KHH7B interaction in the model space $Z$ = 58-114 and $N$ = 100-164 around doubly-magic $^{208}$ Pb. We allow valence neutrons to occupy in the $1 f_{5/2}$ , $2 p_{3/2}$ , $2 p_{1/2}$ , and $0 i_{13/2}$ orbitals, while two valence protons beyond $Z = 82$ are occupied in $0 h_{9/2}$ , $1 f_{7/2}$ and $0 i_{13/2}$ orbitals. The calculated energies and electromagnetic properties are compared with the available experimental data and predicted where experimental data are not available. We have also reported shell-model results for different isomeric states of these nuclei.
Comments:
35 pages, 12 figures
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2305.15131 [pdf]
NPA(2024)·5 citations
04
[Submitted on 23 May 2023] (cross-list from hep-ph)
Unraveling the nature of the novel $T_{cs}$ and $T_{c s ˉ}$ tetraquark candidates
P.G. Ortega🇪🇸 · D.R. Entem🇪🇸 · F. Fernandez🇪🇸 · J. Segovia🇪🇸
Using proton-proton collisions at centre-of-mass energies $7$ , $8$ , and $13$ TeV, with a total integrated luminosity of $9 fb^{- 1}$ , the LHCb collaboration has performed amplitude analyses of the $B^{+} \to D^{+} D^{-} K^{+}$ , $B^{+} \to D^{-} D_{s}^{+} π^{+}$ and $B^{0} \to D ˉ^{0} D_{s}^{+} π^{-}$ decays, observing that new $T_{cs}$ and $T_{c s ˉ}$ resonances are required in order to explain the experimental data. These signals could be the first observation of tetraquark candidates that do not contain a heavy quark-antiquark pair; in fact, they consist of four different flavours of quarks, one of which is a doubly charged open-charm state. We present herein an analysis of the $T_{cs}$ and $T_{c s ˉ}$ states, which is an extension of our recently published study of similar $T_{cc}^{+}$ exotic candidates. Our theoretical framework is a constituent-quark-model-based coupled-channels calculation of $q q^{'} s ˉ c ˉ$ and $c q s ˉ q ˉ^{'}$ tetraquark sectors for $T_{cs}$ and $T_{c s ˉ}$ structures, respectively. We explore the nature, and pole position, of the singularities that appear in the scattering matrix with spin-parity quantum numbers: $J^{P} = 0^{\pm}$ , $1^{\mp}$ , and $2^{\pm}$ . The constituent quark model has been widely used in the heavy quark sector, and thus all model parameters are already constrained from previous works. This makes our predictions robust and parameter-free. We find many singularities in the solution of various scattering-matrix problems which are either virtual states or resonances, but not bound states. Some of them fit well with the experimental observations of the spin-parity, mass and width of $T_{cs}$ and $T_{c s ˉ}$ candidates, and thus tentative assignments are made; however, with caution, because the experimental Breit-Wigner parameters are related to the pole characteristics.
Comments:
10 pages, 4 tables
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2305.14430 [pdf]
PRD(2023)·30 citations
05
[Submitted on 24 May 2023] (cross-list from hep-ph)
Automated calculation of Jet fragmentation at NLO in QCD
ChongYang Liu🇨🇳 · XiaoMin Shen🇨🇳 · Bin Zhou🇨🇳 · Jun Gao🇨🇳
We present FMNLO, a framework to combine general-purpose Monte Carlo generators and fragmentation functions (FFs). It is based on a hybrid scheme of phase-space slicing method and local subtraction method, and accurate to next-to-leading order (NLO) in QCD. The new framework has been interfaced to MG5 aMC@NLO and made publicly available in this work. We demonstrate its unique ability by giving theoretical predictions of various fragmentation measurements at the LHC, followed by comparison with the data. With the help of interpolation techniques, FMNLO allows for fast calculation of fragmentation processes for a large number of different FFs, which makes it a promising tool for future fits of FFs. As an example, we perform a NLO fit of parton fragmentation functions to unidentified charged hadrons using measurements at the LHC. We find the ATLAS data from inclusive dijet production show a strong constraining power. Notable disparities are found between our gluon FF and that of BKK, DSS and NNFF, indicating the necessities of additional constraints and data for gluon fragmentation function.
Comments:
35 pages, 15 figures, 3 tables; comments are welcome
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
arXiv:
2305.14620 [pdf]
JHEP(2023)·23 citations
06
[Submitted on 24 May 2023] (cross-list from hep-ph)
Structure of the medium formed in heavy ion collisions
J. R. Alvarado García🇲🇽 · D. Rosales Herrera🇲🇽 · A. Fernández Téllez🇲🇽 · Bogar Díaz🇪🇸 · J. E. Ramírez🇲🇽
We investigate the structure of the medium formed in heavy ion collisions using three different models: the Color String Percolation Model (CSPM), the Core-Shell-Color String Percolation Model (CSCSPM), and the Color Glass Condensate (CGC) framework. We analyze the radial distribution function of the transverse representation of color flux tubes in each model to determine the medium's structure. Our results indicate that the CSPM behaves as an ideal gas, while the CSCSPM exhibits a structural phase transition from a gas-like to a liquid-like structure. Additionally, our analysis of the CGC framework suggests that it produces systems that behave like interacting gases for AuAu central collisions at RHIC energies and liquid-like structures for PbPb central collisions at LHC energies.
Comments:
15 pages, 8 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2305.14860 [pdf]
Universe(2023)·1 citation
07
[Submitted on 24 May 2023] (cross-list from hep-ph)
Extraction of the Parton Momentum-Fraction Dependence of Generalized Parton Distributions from Exclusive Photoproduction
Jian-Wei Qiu🇺🇸 · Zhite Yu🇺🇸
The $x$ dependence of hadrons' generalized parton distributions (GPDs) $F (x, ξ, t)$ is the most difficult to extract from the existing known processes, while the $ξ$ and $t$ dependence are uniquely determined by the kinematics of the scattered hadron. We study the single diffractive hard exclusive processes for extracting GPDs in the photoproduction. We demonstrate quantitatively the enhanced sensitivity on extracting the $x$ dependence of various GPDs from the photoproduction cross sections, as well as the asymmetries constructed from photon polarization and hadron spin that could be measured at JLab Hall D by GlueX Collaboration and future facilities.
Comments:
5 pages, 5 figures, plus a supplemental material that is 5 pages + 2 figures; to match the journal version
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2305.15397 [pdf]
PRL(2023)·42 citations

Affiliations

first authorsco-authorsvia INSPIRE

Ab initio study of nuclear clustering in hot dilute nuclear matter

Electric 1+ state below nuclear scissors

Systematic shell-model study for structure and isomeric states in 200−210Po isotopes

Unraveling the nature of the novel Tcs​ and Tcsˉ​ tetraquark candidates

Automated calculation of Jet fragmentation at NLO in QCD

Structure of the medium formed in heavy ion collisions

Extraction of the Parton Momentum-Fraction Dependence of Generalized Parton Distributions from Exclusive Photoproduction

Affiliations

Electric $1^{+}$ state below nuclear scissors

Systematic shell-model study for structure and isomeric states in $^{200 - 210}$ Po isotopes

Unraveling the nature of the novel $T_{cs}$ and $T_{c s ˉ}$ tetraquark candidates