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Nuclear Theory·nucl-th

Monday·September 7, 2020

7 papers—4 primary·3 cross-listed

All7Primary4Cross-lists3
  1. 05

    [Submitted on 4 Sept 2020] (cross-list from hep-ph)

    Deciphering the charged heavy quarkoniumlike states in chiral effective field theory

    Bo Wang🇨🇳 · Lu Meng🇨🇳 · Shi-Lin Zhu🇨🇳

    We generalize the framework of chiral effective field theory to study the interactions of the isovector and systems up to the next-to-leading order, in which the long-, mid-, and short-range force contributions as well as the - wave mixing are incorporated. Based on the Lippmann-Schwinger equation, we fit the invariant mass distributions of the elastic channels measured by the BESIII and Belle Collaborations. Our results indicate that the four charged charmoniumlike and bottomoniumlike states , and , can be well identified as the and molecular resonances. The bound state explanations are vetoed in our framework. Our study favors the and states are the twin partners under the heavy quark symmetry.

    Comments:
    6 pages, 3 figures and 1 table
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    2009.01980 [pdf]
    PRD(2020)·30 citations
  2. 06

    [Submitted on 4 Sept 2020] (cross-list from hep-ph)

    Progress on 3+1D Glasma simulations

    Andreas Ipp🇦🇹 · David I. Müller🇦🇹

    We review our progress on 3+1D Glasma simulations to describe the earliest stages of heavy-ion collisions. In our simulations we include nuclei with finite longitudinal extent and describe the collision process as well as the evolution of the strongly interacting gluonic fields in the laboratory frame in 3+1 dimensions using the colored particle-in-cell method. This allows us to compute the 3+1 dimensional Glasma energy-momentum tensor, whose rapidity dependence can be compared to experimental pion multiplicity data from RHIC. An improved scheme cures the numerical Cherenkov instability and paves the way for simulations at higher energies used at LHC.

    Comments:
    9 pages, 5 figures, invited contribution to EPJA topical issue "Theory of Hot Matter and Relativistic Heavy-Ion Collisions (THOR)"
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    2009.02044 [pdf]
    EPJA(2020)·22 citations
  3. 07

    [Submitted on 4 Sept 2020] (cross-list from hep-ph)

    Jet suppression from small to large radius

    Daniel Pablos🇳🇴

    The angular dependence of jet suppression encodes key information about the process of energy and momentum hydrodynamization, and for this reason can be used to greatly improve our understanding of fundamental aspects of the jet/QGP interaction. In this work we study jet suppression from small to very large radius, for low and very high energy jets at the LHC and RHIC. We use the hybrid strong/weak coupling model for jet quenching that combines perturbative shower evolution with an effective strongly coupled description of the energy and momentum transfer from the jet into the QGP. Because of energy-momentum conservation, the wake created by the jet enhances or depletes the yield of particles generated at the freeze-out hypersurface depending on their orientation with respect to the direction of the jet. We find that jet suppression is remarkably independent of the anti- radius R, specially at LHC, first slightly increasing by opening R, then at larger values of R slowly decreasing. This nearly independence of jet suppression with R arises from two competing effects, namely the larger energy loss of the energetic jet components, which tends to increase suppression, against the partial recovery of the lost energy due to medium response, which reduces suppression. We find that the boosted medium from the recoiling jet depletes the amount of QGP in the direction opposite to it in the transverse plane, inducing energy loss due to an over-subtraction effect. We show that this unique signature of the hydrodynamization of part of the jet energy can be scrutinized by selecting samples of dijet configurations with different relative rapidities between the leading and the subleading jet.

    Comments:
    4 pages, 2 figures, 10th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2009.02202 [pdf]
    PoS(2021)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE