Tue·Aug 10, 2021Tuesday·August 10, 2021

1. 01*

   QCD Critical Point and Net-Proton Number Fluctuations at RHIC-STAR

   Yu Zhang (for the STAR Collaboration)🇨🇳

   In the search of QCD phase boundary and critical point, higher-order cumulants of conserved quantities are proposed as promising observables and have been studied extensively both experimentally and theoretically. In this paper we present cumulant ratios up to $6^{th}$-order of net-proton number distributions in Au+Au collisions at $\sqrt{{\mathrm{s}}_{\mathrm{NN}}}$ = 7.7 - 200 GeV from STAR Beam Energy Scan program phase I and $\sqrt{\mathrm{s}}$ = 200 GeV $p+p$ collisions. The results are compared with various models and Lattice QCD calculations.

   nucl-exhep-exEPJ Web Conf.(2022)·1 citation
2. 02*

   Progress in Nuclear Astrophysics of East and Southeast Asia

   Azni Abdul Aziz🇲🇾 · Nor Sofiah Ahmad🇲🇾 · S. Ahn🇰🇷 · Wako Aoki🇯🇵 · Muruthujaya Bhuyan🇲🇾 · Ke-Jung Chen🇹🇼 · Gang Guo🇹🇼 · K. I. Hahn🇰🇷 · Toshitaka Kajino · Hasan Abu Kassim🇲🇾 · D. Kim🇰🇷 · Shigeru Kubono🇯🇵 and 16 other authors

   Nuclear astrophysics is an interdisciplinary research field of nuclear physics and astrophysics, seeking for the answer to a question, how to understand the evolution of the Universe with the nuclear processes which we learn. We review the research activities of nuclear astrophysics in east and southeast Asia which includes astronomy, experimental and theoretical nuclear physics and astrophysics. Several hot topics such as the Li problems, critical nuclear reactions and properties in stars, properties of dense matter, r-process nucleosynthesis and $\nu$-process nucleosynthesis are chosen and discussed in further details. Some future Asian facilities, together with physics perspectives, are introduced.

   nucl-exastro-ph.SRnucl-thAAPPS Bull.(2021)·6 citations
3. 03*

   Radiative corrections to semileptonic beta decays: Progress and challenges

   Chien-Yeah Seng🇩🇪

   We review some recent progress in the theory of electroweak radiative corrections in semileptonic decay processes. The resurrection of the so-called Sirlin's representation based on current algebra relations permits a clear separation between the perturbatively-calculable and incalculable pieces in the $\mathcal{O}(G_F\alpha )$ radiative corrections. The latter are expressed as compact hadronic matrix elements that allow systematic non-perturbative analysis such as dispersion relation and lattice QCD. This brings substantial improvements to the precision of the electroweak radiative corrections in semileptonic decays of pion, kaon, free neutron and $J^P=0^{+}$ nuclei that are important theory inputs in precision tests of the Standard Model. Unresolved issues and future prospects are discussed.

   ↳ hep-phhep-exhep-latnucl-ex+1Particles(2021)·29 citations
4. 04*

   A new production route of Gadolinium-148 for use in Radioisotope Thermoelectric Generators

   Ozan Artun

   The production of Gd-148 had challenges for available methods in the literature, such as its high cost and low production amount. Therefore, we recommended a new production route of Gd-148 on natural Sm and Eu targets via particle accelerators. For this aim, we calculated and simulated cross-section, activity, the yield of product, and integral yield curves for 21 different nuclear reaction processes under certain conditions. Based on the obtained results, we proposed the radioisotope Gd-148 to use Radioisotope Thermoelectric Generators for deep space and planetary explorations in spacecraft and space-probes as a suitable energy source, instead of Pu-238.

   ↳ physics.app-phnucl-exnucl-thAppl.Radiat.Isot.(2022)·0 citations
5. 05*

   Bayesian approach to long-range correlations and multiplicity fluctuations in nucleus-nucleus collisions

   Kianusch Vahid Yousefnia🇫🇷 · Atharva Kotibhaskar🇮🇳 · Rajeev Bhalerao🇮🇳 · Jean-Yves Ollitrault🇫🇷

   The number of particles detected in a nucleus-nucleus collision strongly depends on the impact parameter of the collision. Therefore, multiplicity fluctuations, as well as rapidity correlations of multiplicities, are dominated by impact parameter fluctuations. We present a method based on Bayesian inference which allows for a robust reconstruction of fluctuations and correlations at fixed impact parameter. We apply the method to ATLAS data on the distribution of charged multiplicity and transverse energy. We argue that multiplicity fluctuations are smaller at large rapidity than around central rapidity. We suggest simple, new analyses, in order to confirm this effect.

   ↳ nucl-thhep-phnucl-exPRC(2022)·19 citations
6. 06*

   Quark Sivers Function at Small $x$: Spin-Dependent Odderon and the Sub-Eikonal Evolution

   Yuri V. Kovchegov🇺🇸 · M. Gabriel Santiago🇺🇸

   We apply the formalism developed earlier for studying transverse momentum dependent parton distribution functions (TMDs) at small Bjorken $x$ to construct the small-$x$ asymptotics of the quark Sivers function. First, we explicitly construct the complete fundamental "polarized Wilson line" operator to sub-sub-eikonal order: this object can be used to study a variety of quark TMDs at small-$x$. We then express the quark Sivers function in terms of dipole scattering amplitudes containing various components of the "polarized Wilson line" and show that the dominant (eikonal) term which contributes to the quark Sivers function at small $x$ is the spin-dependent odderon, confirming the recent results of Dong, Zheng and Zhou. Our conclusion is also similar to the case of the gluon Sivers function derived by Boer, Echevarria, Mulders and Zhou (see also the work by Szymanowski and Zhou). We also analyze the sub-eikonal corrections to the quark Sivers function using the constructed "polarized Wilson line" operator. We derive new small-$x$ evolution equations re-summing double-logarithmic powers of ${\alpha }_s{\ln }^2(1/x)$ with ${\alpha }_s$ the strong coupling constant. We solve the corresponding novel evolution equations in the large-$N_c$ limit, obtaining a sub-eikonal correction to the spin-dependent odderon contribution. We conclude that the quark Sivers function at small $x$ receives contributions from two terms and is given by \begin{align} f_{1 \: T}^{\perp \: q} (x, k_T^2) = C_O (x, k_T^2) \, \frac{1}{x} + C_1 (k_T^2) \, \left( \frac{1}{x} \right)^0 + \ldots \end{align} with the function $C_O(x,k_T^2)$ varying slowly with $x$ and the ellipsis denoting the sub-asymptotic and sub-sub-eikonal (order-$x$) corrections.

   ↳ hep-phhep-exnucl-exnucl-thJHEP(2021)·59 citations
7. 07*

   A brief account of Steven Weinberg's legacy in ab initio many-body theory

   Christian Drischler🇺🇸 · Scott K. Bogner🇺🇸

   In this contribution to the special issue "Celebrating 30 years of Steven Weinberg's papers on Nuclear Forces from Chiral Lagrangians," we emphasize the important role chiral effective field theory has played in leading nuclear physics into a precision era. To this end, we share our perspective on a few of the recent advances made in ab initio calculations of nuclear structure and nuclear matter observables, as well as Bayesian uncertainty quantification of effective field theory truncation errors.

   ↳ nucl-thhep-phnucl-exFew Body Syst.(2021)·9 citations
8. 08*

   Learning Langevin dynamics with QCD phase transition

   Lingxiao Wang🇩🇪 · Lijia Jiang🇨🇳 · Kai Zhou🇩🇪

   In this proceeding, the deep Convolutional Neural Networks (CNNs) are deployed to recognize the order of QCD phase transition and predict the dynamical parameters in Langevin processes. To overcome the intrinsic randomness existed in a stochastic process, we treat the final spectra as image-type inputs which preserve sufficient spatiotemporal correlations. As a practical example, we demonstrate this paradigm for the scalar condensation in QCD matter near the critical point, in which the order parameter of chiral phase transition can be characterized in a $1+1$-dimensional Langevin equation for $\sigma$ field. The well-trained CNNs accurately classify the first-order phase transition and crossover from $\sigma$ field configurations with fluctuations, in which the noise does not impair the performance of the recognition. In reconstructing the dynamics, we demonstrate it is robust to extract the damping coefficients $\eta$ from the intricate field configurations.

   ↳ nucl-thnucl-exphysics.data-anEPJ Web Conf.(2022)·2 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.