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Nuclear Theory·nucl-th

Wednesday·October 11, 2017

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 05

    [Submitted on 6 Oct 2017] (cross-list from physics.atom-ph)

    Electric Dipole Moments of the Atoms, Molecules, Nuclei and Particles

    Timothy Chupp🇺🇸 · Peter Fierlinger🇩🇪 · Michael Ramsey-Musolf🇺🇸 · Jaideep Singh🇺🇸

    A permanent electric dipole moment (EDM) of a particle or system is a separation of charge along its angular-momentum axis and is a direct signal of T-violation and, assuming CPT symmetry, CP violation. For over sixty years EDMs have been studied, first as a signal of a parity-symmetry violation and then as a signal of CP violation that would clarify its role in nature and in theory. Contemporary motivations include the role that CP violation plays in explaining the cosmological matter-antimatter asymmetry and the search for new physics. Experiments on a variety of systems have become ever-more sensitive, but provide only upper limits on EDMs, and theory at several scales is crucial to interpret these limits. Nuclear theory provides connections from Standard-Model and Beyond-Standard-Model physics to the observable EDMs, and atomic and molecular theory reveal how CP-violation is manifest in these systems. EDM results in hadronic systems require that the Standard Model QCD parameter of must be exceptionally small, which could be explained by the existence of axions - also a candidate dark-matter particle. Theoretical results on electroweak baryogenesis show that new physics is needed to explain the dominance of matter in the universe. Experimental and theoretical efforts continue to expand with new ideas and new questions, and this review provides a broad overview of theoretical motivations and interpretations as well as details about experimental techniques, experiments, and prospects. The intent is to provide specifics and context as this exciting field moves forward.

    Comments:
    To be published in Reviews of Modern Physics
    Subjects:
    Atomic Physics (physics.atom-ph); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1710.02504 [pdf]
    RMP(2019)·477 citations
  2. 06

    [Submitted on 9 Oct 2017] (cross-list from hep-ph)

    N-Jettiness Subtractions for at Subleading Power

    Ian Moult🇺🇸 · Lorena Rothen🇩🇪 · Iain W. Stewart🇺🇸 · Frank J. Tackmann🇩🇪 · Hua Xing Zhu🇺🇸

    -jettiness subtractions provide a general approach for performing fully-differential next-to-next-to-leading order (NNLO) calculations. Since they are based on the physical resolution variable -jettiness, , subleading power corrections in , with a hard interaction scale, can also be systematically computed. We study the structure of power corrections for -jettiness, , for the process. Using the soft-collinear effective theory we analytically compute the leading power corrections and (finding partial agreement with a previous result in the literature), and perform a detailed numerical study of the power corrections in the , , and channels. This includes a numerical extraction of the and corrections, and a study of the dependence on the definition. Including such power suppressed logarithms significantly reduces the size of missing power corrections, and hence improves the numerical efficiency of the subtraction method. Having a more detailed understanding of the power corrections for both and initiated processes also provides insight into their universality, and hence their behavior in more complicated processes where they have not yet been analytically calculated.

    Comments:
    16 pages, 12 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1710.03227 [pdf]
    PRD(2018)·97 citations
  3. 07

    [Submitted on 9 Oct 2017] (cross-list from hep-th)

    Relativistic Hydrodynamic Attractors with Broken Symmetries: Non-Conformal and Non-Homogeneous

    Paul Romatschke🇺🇸

    Standard textbooks will state that hydrodynamics requires near-equilibrium to be applicable. Recently, however, out-of-equilibrium attractor solutions for hydrodynamics have been found in kinetic theory and holography in systems with a high degree of symmetry, suggesting the possibility of a genuine out-of-equilibrium formulation of hydrodynamics. This work demonstrates that attractor solutions also occur in non-conformal kinetic theory and spatially non-homogeneous systems, potentially having important implications for the interpretation of experimental data in heavy-ion and proton-proton collisions and relativistic fluid dynamics as a whole.

    Comments:
    13 pages, 2 figures; v2: minor changes (typos, etc.); v3: matches published version
    Subjects:
    High Energy Physics — Theory (hep-th); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
    arXiv:
    1710.03234 [pdf]
    JHEP(2017)·117 citations
  4. 08

    [Submitted on 10 Oct 2017] (cross-list from hep-ph)

    Medium modification of strange hadronic resonances at SIS, RHIC and LHC energies

    Laura Tolos🇪🇸

    The properties of strange pseudoscalar and vectors mesons as well as strange baryon resonances in dense matter are reviewed. Some open questions on the properties of strange hadrons in medium are addressed, such as the experimental signatures of in-medium effects coming from the hadronic phase on the final observables in heavy-ion collisions for the experimental conditions at SIS, RHIC and LHC energies.

    Comments:
    6 pages, 4 figures, contribution based on a plenary talk at Strangeness in Quark Matter (SQM2017), 10-15 July 2017, Utrecht (The Netherlands)
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1710.03489 [pdf]
    EPJ Web Conf.(2018)·2 citations

Affiliations

first authorsco-authorsvia INSPIRE