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Nuclear Theory·nucl-th

Thursday·April 2, 2020

6 papers—5 primary·1 cross-listed

All6Primary5Cross-lists1
  1. 01

    Extracting the jet transport coefficient of cold nuclear matter from world data

    Peng Ru🇨🇳 · Zhong-Bo Kang🇺🇸 · Enke Wang🇨🇳 · Hongxi Xing🇨🇳 · Ben-Wei Zhang🇨🇳

    We present the first global extraction of the jet transport coefficient () for cold nuclear matter within the framework of higher-twist expansion. The analysis takes into account the world data on transverse momentum broadening in semi-inclusive -A deep inelastic scattering (DIS) and in Drell-Yan dilepton and heavy quarkonium production in -A collisions, as well as the nuclear modification of the structure functions in DIS. The results of this work provide the first quantitative evidence for the universality and non-trivial scale dependence of the medium transport property, similar to that for nucleon structure as encoded in the standard parton distribution functions. We expect the extracted scale dependence of for cold nuclear matter can be extended to precisely identify the fundamental property of quark gluon plasma.

    nucl-thnucl-exNPA(2021)·2 citations
  2. 02

    Comment on "Observation of annual modulation by rays from (,) reactions at the Soudan Underground Laboratory"

    Peter Mohr🇭🇺

    Tiwari {\it et al.}\ have identified an annual modulation of the -ray flux at the Soudan Underground Laboratory which is strongly correlated to the radon concentration. The -ray flux results from (,) reactions which are induced by the activity of radon and its daughters. Unfortunately, the quantitative analysis of the -ray flux is based on unrealistic (,) cross sections, and thus the calculated -ray fluxes are not reliable.

    nucl-thPRC(2020)·0 citations
  3. 03

    A Consistency Test of EFT Power Countings from Residual Cutoff Dependence

    Harald W. Griesshammer (George Washington U.)🇺🇸

    A method to quantitatively assess the consistency of power-counting proposals in Effective Field Theories (EFT) which are non-perturbative at leading order is presented. The Renormalisation Group evolution of an observable predicts the functional form of its residual cutoff dependence on the breakdown scale of an EFT, on the low-momentum scales, and on the order of the calculation. Passing this test is a necessary but not sufficient consistency criterion for a suggested power counting whose exact nature is disputed. In Chiral Effective Field Theory (ChiEFT) with more than one nucleon, a lack of universally accepted analytic solutions obfuscates the convergence pattern in results. This led to proposals which predict different sets of Low Energy Coefficients (LECs) at the same chiral order, and at times even predict a different ordering long-range contributions. The method may independently check whether an observable is renormalised at a given order, and proves estimates of both the breakdown scale and the momentum-dependent order-by-order convergence pattern. Conversely, it helps identify those LECs (and long-range pieces) which ensure renormalised observables at a given order. I also discuss assumptions and the relation to Wilson's Renormalisation Group; useful observable and cutoff choices; the momentum window with likely best signals; its dependence on the values and forms of cutoffs as well as on the EFT parameters; the impact of fitting LECs to data; and caveats as well as limitations. Since the test is designed to minimise the use of data, it quantitatively falsifies if the EFT has been renormalised consistently. This complements other tests which quantify how an EFT compares to experiment. Its application in particular to the 3P0 and P2-3F2 partial waves of NN scattering in ChiEFT may elucidate persistent power-counting issues.

    nucl-thhep-phphysics.atm-clusEPJA(2020)·24 citations
  4. 04

    On nonlinearity in hydrodynamic response to the initial geometry in relativistic heavy-ion collisions

    Dan Wen🇨🇳 · Kai Lin🇨🇳 · Wei-Liang Qian🇧🇷 · Bin Wang🇨🇳 · Yogiro Hama🇧🇷 · Takeshi Kodama🇧🇷

    In the context of event-by-event hydrodynamic description, we analyze the implications of two models characterized by distinct initial conditions. The initial energy density of the first model adopts a Gaussian-type distribution, while those of the second one are features by high energy peripheral tubes. We calibrate the initial conditions of both models so that their initial probability distribution of eccentricity are mostly identical. Subsequently, the resultant scaled probability distributions of collective flow and the correlations between flow harmonic and eccentricity coefficients are investigated. Besides, the calculations are carried out for particle correlations regarding the symmetric cumulant, mixed harmonics, and nonlinear response coefficients. Although the resultant two-particle correlations possess similar shapes, numerical calculations indicate a subtle difference between the two models. To be specific, the difference resides in more detailed observables such as the probability distributions of elliptic flow as well as Pearson correlation coefficient regarding higher-order harmonics. We discuss several essential aspects concerning the linearity and nonlinearity between initial eccentricities and final state anisotropies. Further implications are addressed.

    nucl-thEPJA(2020)·12 citations
  5. 05

    Chirality and Magnetic Field

    Defu Hou🇨🇳 · Anping Huang🇺🇸 · Jinfeng Liao🇺🇸 · Shuzhe Shi🇨🇦 · Hui Zhang🇨🇳

    We present a brief overview on recent developments of theory and phenomenology for novel many-body phenomena related to the chirality and magnetic field, with an emphasis on their experimental implications and possible detection in relativistic nuclear collisions.

    nucl-thhep-phnucl-exNPA(2021)·4 citations

Affiliations

first authorsco-authorsvia INSPIRE