Fri·Oct 21, 2022Friday·October 21, 2022

1. 01*

   Measurements of the elliptic and triangular azimuthal anisotropies in central ${}^3$He+Au, $d$+Au and $p$+Au collisions at \mbox{\sqrt{s_{\mathrm{NN}}}} = 200 GeV

   STAR Collaboration: M. I. Abdulhamid · B. E. Aboona · J. Adam · J. R. Adams · G. Agakishiev · I. Aggarwal · M. M. Aggarwal · Z. Ahammed · A. Aitbaev · I. Alekseev · D. M. Anderson · A. Aparin and 346 other authors

   The elliptic ($v_2$) and triangular ($v_3$) azimuthal anisotropy coefficients in central ${}^3$He+Au, $d$+Au, and $p$+Au collisions at \mbox{\sqrt{s_{\mathrm{NN}}}} = 200 GeV are measured as a function of transverse momentum ($p_{\mathrm{T}}$) at mid-rapidity ($|\eta |<$0.9), via the azimuthal angular correlation between two particles both at $|\eta |<$0.9. While the $v_2(p_{\mathrm{T}})$ values depend on the colliding systems, the $v_3(p_{\mathrm{T}})$ values are system-independent within the uncertainties, suggesting an influence on eccentricity from sub-nucleonic fluctuations in these small-sized systems. These results also provide stringent constraints for the hydrodynamic modeling of these systems.

   nucl-exPRL(2023)·83 citations
2. 02*

   Measured proton electromagnetic structure deviates from theoretical predictions

   R. Li🇺🇸 · N. Sparveris🇺🇸 · H. Atac🇺🇸 · M. K. Jones🇺🇸 · M. Paolone🇺🇸 · Z. Akbar🇺🇸 · C. Ayerbe Gayoso🇺🇸 · V. Berdnikov🇺🇸 · D. Biswas🇺🇸 · M. Boer🇺🇸 · A. Camsonne🇺🇸 · J.-P. Chen🇺🇸 and 35 other authors

   The visible world is founded on the proton, the only composite building block of matter that is stable in nature. Consequently, understanding the formation of matter relies on explaining the dynamics and the properties of the proton's bound state.A fundamental property of the proton involves the response of the system to an external electromagnetic field. It is characterized by the electromagnetic polarizabilities that describe how easily the charge and magnetization distributions inside the system are distorted by the electromagnetic field. Moreover, the generalized polarizabilities map out the resulting deformation of the densities in a proton subject to an electromagnetic field. They disclose essential information about the underlying system dynamics and provide a key for decoding the proton structure in terms of the theory of the strong interaction that binds its elementary quark and gluon constituents. Of particular interest is a puzzle in the electric generalized polarizability of the proton that remains unresolved for two decades. Here we report measurements of the proton's electromagnetic generalized polarizabilities at low four-momentum transfer squared. We show evidence of an anomaly to the behaviour of the proton's electric generalized polarizability that contradicts the predictions of nuclear theory and derive its signature in the spatial distribution of the induced polarization in the proton. The reported measurements suggest the presence of a new, not-yet-understood dynamical mechanism in the proton and present notable challenges to the nuclear theory.

   nucl-exnucl-thNature(2022)·12 citations
3. 03*

   Nuclear Equation of State and Single-nucleon Potential from Gogny-like Energy Density Functionals Encapsulating Effects of Nucleon-nucleon Short-range Correlations

   Bao-Jun Cai🇨🇳 · Bao-An Li🇺🇸

   Nucleon-nucleon short-range correlations (SRCs) induce a high momentum tail (HMT) in the single-nucleon momentum distribution function $n_{\check{k}}^J(\rho ,\delta )$ in cold neutron-rich matter. While there are clear experimental evidences that the SRC/HMT effects are different for neutrons and protons and their strengths depend strongly on the isospin asymmetry of finite nuclei mostly based on electron-nucleus scattering experiments, much less is known experimentally about the SRC/HMT effects in the dense neutron-rich matter. To facilitate further explorations of SRC/HMT effects in dense neutron-rich matter especially with heavy-ion reactions involving high-energy radioactive beams as well as multimessenger observations of neutron stars and their mergers, by incorporating the SRC-induced HMT in $n_{\check{k}}^J(\rho ,\delta )$ into a Gogny-like energy density functional we study SRC/HMT effects on the equation of state (EOS) especially its symmetry energy term and single-nucleon potential in the dense asymmetric nucleonic matter (ANM). Using a parametrization as a surrogate for the momentum-dependent kernel in the Gogny-like energy density functional (EDF) we derive analytical expressions for all components of the ANM EOS and their characteristics (e.g., magnitude, slope and curvature as well as nucleon effective mass) at saturation density ${\rho }_0$ as well as the momentum-dependent single-nucleon optical potential in neutron-rich matter using parameters characterizing nuclear interactions as well as the size, shape and isospin dependence of the HMT at ${\rho }_0$. Some consequences of the SRC/HMT effects on properties of neutron stars are also studied.

   ↳ nucl-thastro-ph.HEnucl-ex8 citations
4. 04*

   Missing beauty of proton-proton interactions

   Iakov Aizenberg🇮🇱 · Zvi Citron🇮🇱 · Alexander Milov🇮🇱

   From first principles, particles with the same quark content and similar masses should have similar kinematic distributions. Transverse mass scaling may be employed to estimate possible differences in the momentum distribution of such particles. Based on this scaling the excited bottomonium states measured at the LHC are found to be significantly different from ${\rm Y}$(1S) to the extent that the integrated yield of ${\rm Y}$(2S) is 1.6 times less and ${\rm Y}$(3S) 2.4 times less than would be explained by the mass difference. This proceeding explains how the estimate is worked out and relates it to other measurements performed at the LHC.

   ↳ hep-phhep-exnucl-exActa Phys.Polon.Supp.(2023)·0 citations
5. 05*

   A lab scale experiment for keV sterile neutrino search

   Y. C. Lee🇰🇷 · H. B. Kim🇰🇷 · H. L. Kim🇰🇷 · S. K. Kim🇰🇷 · Y. H. Kim🇰🇷 · D. H. Kwon🇰🇷 · H. S. Lim🇰🇷 · H. S. Park🇰🇷 · K. R. Woo🇰🇷 · Y. S. Yoon🇰🇷

   We developed a simple small-scale experiment to measure the beta decay spectrum of ${}^3$H. The aim of this research is to investigate the presence of sterile neutrinos in the keV region. Tritium nuclei were embedded in a 1$\times$1$\times$1 cm${}^3$ LiF crystal from the ${}^6$Li(n,$\alpha$)${}^3$H reaction. The energy of the beta electrons absorbed in the LiF crystal was measured with a magnetic microcalorimeter at 40 mK. We report a new method of sample preparation, experiments, and analysis of ${}^3$H beta measurements. The spectrum of a 10-hour measurement agrees well with the expected spectrum of ${}^3$H beta decay. The analysis results indicate that this method can be used to search for keV-scale sterile neutrinos.

   ↳ physics.ins-dethep-exnucl-exJ.Low Temp.Phys.(2022)·5 citations
6. 06*

   Pomeron and Reggeon contributions to elastic proton-proton and proton-antiproton scattering in holographic QCD

   Zhibo Liu🇨🇳 · Wei Xie🇨🇳 · Akira Watanabe🇨🇳

   The total and differential cross sections of elastic proton-proton and proton-antiproton scattering are studied in a holographic QCD model, considering the Pomeron and Reggeon exchanges in the Regge regime. In our model setup, the Pomeron and Reggeon exchanges are described by the Reggeized spin-2 glueball and vector meson propagators, respectively. How those contributions change with the energy is explicitly shown, focusing on the contribution ratios. The adjustable parameters included in the model are determined with the experimental data, and it is presented that the resulting total and differential cross sections are consistent with the data in a wide kinematic region.

   ↳ hep-phhep-exnucl-exnucl-thPRD(2023)·13 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.