PaperPanorama
FAQ

Nuclear Theory·nucl-th

Thursday·August 1, 2024

11 papers—5 primary·6 cross-listed

All11Primary5Cross-lists6
  1. 06

    [Submitted on 30 Jul 2024] (cross-list from hep-ph)

    The Fox-Wolfram Moment of Jet Production in Relativistic Heavy Ion Collisions

    Wei-Xi Kong🇨🇳 · Ben-Wei Zhang🇨🇳

    We present the first theoretical investigation of Fox-Wolfram moments (FWMs) for multi-jet production in relativistic heavy ion collisions. In this work, jet productions in p+p collisions are computed with a Monte Carlo event generator SHERPA, while the Linear Boltzmann Transport model is utilized to simulate the multiple scattering of energetic partons in the hot and dense QCD matter. The event-normalized distributions of the lower-order FWM, in p+p and Pb+Pb collisions are calculated. It is found that for events with jet number the distribution in Pb+Pb is suppressed at small while enhanced at large region as compared to p+p. For events with , the jet number reduction effect due to jet quenching in the QGP decreases the distribution at large in Pb+Pb relative to p+p. The medium modification of the Fox-Wolfram moment for events with are also presented, which resemble those of events with . Its reason is revealed through the relative contribution fractions of events with different final-state jet numbers to .

    Comments:
    10 pages, 7 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2407.20680 [pdf]
    CPC(2025)·1 citation
  2. 07

    [Submitted on 30 Jul 2024] (cross-list from hep-ph)

    Gravitational form factors of pion from top-down holographic QCD

    Daisuke Fujii🇯🇵 · Akihiro Iwanaka🇯🇵 · Mitsuru Tanaka🇯🇵

    The gravitational form factors (GFFs) of pions are calculated from a top-down holographic quantum chromodynamics (QCD) approach with momentum transfer dependence for the first time. It is important because the GFFs of hadrons have information on the internal stress distribution that may provide insight into the mechanism of how QCD forms hadrons. The forward limit value of this GFFs, i.e. the D-term, was also obtained. Furthermore, in this approach, we observe the so-called glueball dominance, in which pions have gravitational interactions via infinite glueball spectra.

    Comments:
    8 pages, 1 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    2407.21113 [pdf]
    PRD(2024)·27 citations
  3. 08

    [Submitted on 30 Jul 2024] (cross-list from quant-ph)

    A framework for semi-universality: Semi-universality of 3-qudit SU(d)-invariant gates

    Austin Hulse🇺🇸 · Hanqing Liu🇺🇸 · Iman Marvian🇺🇸

    Quantum circuits with symmetry-respecting gates have attracted broad interest in quantum information science. While recent work has developed a theory for circuits with Abelian symmetries, revealing important distinctions between Abelian and non-Abelian cases, a comprehensive framework for non-Abelian symmetries has been lacking. In this work, we develop novel techniques and a powerful framework that is particularly useful for understanding circuits with non-Abelian symmetries. Using this framework we settle an open question on quantum circuits with SU(d) symmetry. We show that 3-qudit SU(d)-invariant gates are semi-universal, i.e., generate all SU(d)-invariant unitaries, up to certain constraints on the relative phases between sectors with inequivalent representation of symmetry. Furthermore, we prove that these gates achieve full universality when supplemented with 3 ancilla qudits. Interestingly, we find that studying circuits with 3-qudit gates is also useful for a better understanding of circuits with 2-qudit gates. In particular, we establish that even though 2-qudit SU(d)-invariant gates are not themselves semi-universal, they become universal with at most 11 ancilla qudits. Additionally, we investigate the statistical properties of circuits composed of random SU(d)-invariant gates. Our findings reveal that while circuits with 2-qudit gates do not form a 2-design for the Haar measure over SU(d)-invariant unitaries, circuits with 3-qudit gates generate a t-design, with t that is quadratic in the number of qudits.

    Comments:
    Preliminary version; 21 pages + 24 pages of Supplementary Material; 5 Figures, Comments Welcome!
    Subjects:
    Quantum Physics (quant-ph); High Energy Physics — Theory (hep-th); Mathematical Physics (math-ph); math.MP (math.MP); Nuclear Theory (nucl-th)
    arXiv:
    2407.21249 [pdf]
    11 citations
  4. 09

    [Submitted on 31 Jul 2024] (cross-list from hep-ph)

    Electromagnetic ratios of hyperons at large timelike

    G. Ramalho🇰🇷 · M.T. Peña🇵🇹 · K. Tsushima🇧🇷 · Myung-Ki Cheoun🇰🇷

    In recent years, it has become possible to measure not only the magnitude of the electric () and magnetic () form factors of spin baryons, but also to measure the relative phases of those quantities in the timelike kinematic region. Aiming to interpret present data on hyperons of the baryon octet, as well as to predict future data, we present model calculations of that ratio for large invariant 4-momentum square in the timelike region (). Without any further parameter fitting,we extend to the timelike region a covariant quark model previously developed to describe the kinematic spacelike region () of the baryon octet form factors. The model takes into account both the effects of valence quarks and the excitations of the meson cloud which dresses the baryons. This application to the timelike region assumes an approximation based on unitarity and analyticity that is valid only in the large region. Using the recent data from BESIII we establish the regime of validity of this approximation. We report here that our results for the effective form factor (combination of and ) are in good agreement with the data already for values above 15 GeV. In addition, a more conservative onset of the validity of the approximation is provided by the newly available data which suggest that our predictions may be compared against data for 20 GeV. This is expected in the near future, when the range of the present measurements is expanded to the 20--50 GeV region.

    Comments:
    Version accepted for publication at Phys. Lett. B. 11 pages, 5 figures + supplementary material
    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:
    2407.21397 [pdf]
    PLB(2024)·14 citations
  5. 10

    [Submitted on 31 Jul 2024] (cross-list from hep-ph)

    Real-time chiral dynamics at finite temperature from quantum simulation

    Kazuki Ikeda🇺🇸 · Zhong-Bo Kang🇺🇸 · Dmitri E. Kharzeev🇺🇸 · Wenyang Qian🇪🇸 · Fanyi Zhao🇺🇸

    In this study, we explore the real-time dynamics of the chiral magnetic effect (CME) at a finite temperature in the (1+1)-dimensional QED, the massive Schwinger model. By introducing a chiral chemical potential through a quench process, we drive the system out of equilibrium and analyze the induced vector currents and their evolution over time. The Hamiltonian is modified to include the time-dependent chiral chemical potential, thus allowing the investigation of the CME within a quantum computing framework. We employ the quantum imaginary time evolution (QITE) algorithm to study the thermal states, and utilize the Suzuki-Trotter decomposition for the real-time evolution. This study provides insights into the quantum simulation capabilities for modeling the CME and offers a pathway for studying chiral dynamics in low-dimensional quantum field theories.

    Comments:
    16 pages, 4 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
    arXiv:
    2407.21496 [pdf]
    JHEP(2024)·20 citations
  6. 11

    [Submitted on 31 Jul 2024] (cross-list from hep-ph)

    Simple high-accuracy method for solving bound-state equations with the Cornell potential in momentum space

    Alfred Stadler🇵🇹 · Elmar P. Biernat🇵🇹 · Vasco Valverde🇵🇹

    The well-known Cornell quark-antiquark potential in momentum space contains singularities both in its one-gluon-exchange (OGE) and linear confining parts, which prevents a direct use of the convenient Nyström method to solve the corresponding bound-state integral equation for the meson masses. While it has been known for a long time how the Coulomb-type singularity in the OGE potential can be treated with a subtraction technique, only very complicated methods have been developed to deal with the stronger singularity in the linear potential. In this work, we present a simple subtraction method to remove this singularity from the kernel, such that the Nyström method becomes applicable. Derivatives of the wave function, that appear as a result of the subtraction, are represented by means of interpolating functions, for which we found Lagrange polynomials to be very efficient. Test calculations show excellent agreement with exactly known energy eigenvalues. By increasing the number of integration points and the order of the Lagrange interpolation polynomials, extremely high accuracy can be achieved. This method can also be extended to relativistic Bethe-Salpeter type equations with singular kernels.

    Comments:
    14 pages; affiliations updated; 2 new paragraphs and the new Table VII added in Sec. IV; data availability Ref. [40] added; version published in Physical Review D
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2407.21789 [pdf]
    PRD(2024)·2 citations

Affiliations

first authorsco-authorsvia INSPIRE