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Nuclear Theory·nucl-th

Thursday·March 20, 2025

6 papers—3 primary·3 cross-listed

All6Primary3Cross-lists3
  1. 01

    [Submitted on 19 Mar 2025]

    Study of event and particle selection effects on elliptic flow background at the isobar experiments based on AMPT model

    Yu Wang🇨🇳 · Hua Pei🇨🇳

    Measurement of the Chiral Magnetic Effect (CME) has been a popular topic of high-energy nuclear physics in the last decade. The flow correlation between charged hadron pairs of the same and opposite charges and their difference were measured to separate the CME-driven signal from the collective flow background especially second-order elliptic . The STAR experiment have stepped further to the isobar experiment to compare and between Ru+Ru and Zr+Zr ~\cite{PhysRevC.105.014901}, which were theoretically expected to produce the same elliptic flow background but different CME signals. However, the measured flow backgrounds also differ between Ru+Ru and Zr+Zr, indicating more fine-tuning of RP and centrality definition necessary. This analysis applied the AMPT model~\cite{PhysRevC.72.064901} to simulate the same collision system and energy as the STAR isobar experiment. Since the AMPT model does not include magnetic field effects, we expect comparing its output between Ru+Ru and Zr+Zr collision systems can provide an insight of the possible bias of flow background definition, and help improve the measurement of CME signal in real experiments. Multiple combinations of centrality and flow definition were chosen to study how the and their difference would be affected, especially by varying the particles selection of charge versus neutral properties and broadening (pseudo-)rapidity regions, while STAR CME work relied on charged-only particles at central rapidity.

    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2503.14815 [pdf]
    2 citations
  2. 02

    [Submitted on 19 Mar 2025]

    Fine-tunings in nucleosynthesis and the emergence of life: Status and perspectives

    Ulf-G. Meißner · Bernard Ch. Metsch · Helen Meyer

    We discuss the fine-tunings of nuclear reactions in the Big Bang and in stars and draw some conclusions on the emergence of the light elements and the life-relevant elements carbon and oxygen. We also stress how to improve these calculations in the future. This requires a concerted effort of different communities, especially in nuclear reaction theory, lattice QCD for few-nucleon systems, stellar evolution calculations, particle physics and philosophy.

    Comments:
    6 pages, 2 figures, invited article for the "Invited Viewpoints and Perspectives'' section of Eur. Phys. J. A, minor corrections
    Subjects:
    Nuclear Theory (nucl-th); Solar and Stellar Astrophysics (astro-ph.SR); High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th)
    arXiv:
    2503.15162 [pdf]
    EPJA(2025)·1 citation
  3. 03

    [Submitted on 19 Mar 2025]

    Nuclear Physics under the low-energy, high intensity frontier

    C.-J. Yang · V. Horny · D. Doria · K. Spohr

    Despite numerous achievements and recent progress, nuclear physics is often (wrongly) considered an old field of research nowadays. However, developments in theoretical frameworks and reliable experimental techniques have made the field mature enough to explore many new frontiers. In this regard, extending existing knowledge to an emerging field of physics -- where particles interact with a relatively low-energy but high intensity field (intense enough so that multi-particle processes become comparable or more important than one-to-one processes) -- can lead to exciting discoveries. Investigations can be realized under a highly time-compressed beam source (e.g., particle sources generated by laser-matter interaction using high-power laser systems). Here we focus on a new scheme, where high-power laser systems are exploited as a driver to generate energetic (-ray) photons. Together with additional low-energy photons provided by a second, less intense laser, a multi-photon absorption scheme enables a very attainable manipulation of nuclear transitions including isomer pumping and depletion.

    Comments:
    5 pages, 5 figures, submitted to SPIE conference proceeding
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2503.15224 [pdf]
    Proc. SPIE 13535, Research Using Extreme …·1 citation

Affiliations

first authorsco-authorsvia INSPIRE