摘要：
Collective flow is a powerful tool used to analyze the properties of a medium created during high-energy nuclear collisions. Here, we report a systematic study of the first two Fourier coefficients
$$v_1$$
and
$$v_2$$
of the proton and
$$\pi ^{+}$$
from Au+Au collisions in the energy range
$$\sqrt{s_{{\text{NN}}}}$$
= 2.11–4.9 GeV within the framework of a hadronic transport model (UrQMD). Recent results from the STAR experiment were used to test the model calculations. A mean-field mode with strong repulsive interaction is needed to reproduce the 10–40% data at 3 GeV. This implies that hadronic interactions play an important role in the collective flow development in the high baryon density region. The mean values of the freeze-out time for protons and
$$\pi ^{+}$$
are shifted earlier owing to the additional repulsive interactions. We predict the energy dependence of the mean values of the transverse momentum
$$\langle p_{\text{T}} \rangle$$
,
$$v_1$$
, and
$$v_2$$
for both protons and
$$\pi ^{+}$$
from the Au+Au collisions.
作者机构：
[Yan, Xiong-Bo; Li, Xiao-Ting; Wei, Wei; Zhang, Ying; Jiang, Xiao-Shan] Chinese Acad Sci, Inst High Energy Phys, Expt Phys Dept, State Key Lab Particle Detect & Elect, 19B Yuquan Rd, Beijing 100049, Peoples R China.;[Jiang, Xiao-Shan] Univ Chinese Acad Sci, Sch Phys Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China.;[Yang, Ping] Cent China Normal Univ, PLAC, Key Lab Quark & Lepton Phys MOE, 152 Luoyu Rd, Wuhan 430079, Peoples R China.
通讯机构：
[Xiao-Ting Li] S;State Key Laboratory of Particle Detection and Electronics, Experimental Physics Department, Institute of High Energy Physics, Chinese Academy of Sciences, 19B Yuquan Road, Beijing, China
作者机构：
[Xiang, Wenchang; Zhao, Wenduo] Guizhou Univ, Dept Phys, Guiyang 550025, Peoples R China.;[Xiang, Wenchang] Guizhou Univ Finance & Econ, Guizhou Key Lab Big Data Stat Anal, Guiyang 550025, Peoples R China.;[Xiang, Wenchang; Wang, Mengliang; Cai, Yanbing] Guizhou Univ Finance & Econ, Guizhou Key Lab Phys & Related Areas, Guiyang 550025, Guizhou, Peoples R China.;[Zhou, Daicui] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.;[Zhou, Daicui] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Xiang, W.] G;Guizhou Key Laboratory of Big Data Statistic Analysis, China
关键词：
color glass condensate;small x physics;gluon saturation
摘要：
The collinearly-improved Balitsky-Kovchegov (ciBK) equation evolved unintegrated gluon distribution (UGD) is used for the first time to study hadron production in high energy proton-proton collisions in order to improve the predictive power of the Color Glass Condensate effective theory. We show that the ciBK equation evolved UGD provides a relatively better description of LHC data on the transverse momentum and integrated multiplicity distributions of charged hadron and neutral pion production for several collision energies compared with the running coupling Balitsky-Kovchegov (rcBK) equation evolved UGD. This is because the ciBK evolved UGD has a sharper transverse momentum distribution than the rcBK UGD. The impact of running coupling prescriptions on hadron production is studied, and it is found that the parent dipole and smallest dipole running coupling prescriptions provide similar depictions of the data. Moreover, the scale dependence of the fragmentation function is investigated by taking three typical values of scale. We find that the differences resulting from the scale dependence of the fragmentation function can be fully absorbed into the normalization factor, which lumps higher order corrections.
作者机构：
[冯毅; 李菂; 张永坤] Research Center for Intelligent Computing Platforms, Zhejiang Laboratory, Hangzhou 311100, China;[牛晨辉; 李菂; 张永坤; 王培] National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China;[李菂; 张永坤] University of Chinese Academy of Sciences, Beijing 100049, China;[李菂] NAOC-UKZN Computational Astrophysics Centre, University of KwaZulu-Natal, Durban 4000, South Africa. Electronic address: dili@nao.cas.cn;[杨元培] South-Western Institute for Astronomy Research, Yunnan University, Kunming 650500, China
通讯机构：
[Di Li] R;Research Center for Intelligent Computing Platforms, Zhejiang Laboratory, Hangzhou 311100, China<&wdkj&>National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China<&wdkj&>University of Chinese Academy of Sciences, Beijing 100049, China<&wdkj&>NAOC-UKZN Computational Astrophysics Centre, University of KwaZulu-Natal, Durban 4000, South Africa
摘要：
Fast radio bursts (FRBs) are bright millisecond-duration radio transients first discovered by Lorimer et al.. While their cosmological origin and energetic nature make them ideal tools for probing a range of astrophysics, their progenitors and radiation mechanisms are still unknown. A particularly interesting subset of FRBs is the so-called repeating FRBs, which recurrently emit millisecond-duration radio bursts.
作者机构：
[Xiao, Le; Zhou, Shi-Qiang; Wang, Dong; Sun, Xiang-Ming; Guo, Di; Huang, Guang-Ming; Zhou, Zhuo; You, Bi-Hui; Yang, Ping; Gao, Chao-Song; Ren, Wei-Ping; Wang, Min; Liu, Jun] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, PLAC, Wuhan 430079, Peoples R China.;[Zhou, Wei; Zhao, Cheng-Xin] Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China.;[Zhao, Cheng-Xin] Univ Chinese Acad Sci, Sch Nucl Sci & Technol, Beijing 100049, Peoples R China.
通讯机构：
[Dong Wang; Shi-Qiang Zhou] P;PLAC, Key Laboratory of Quark & Lepton Physics (MOE), Central China Normal University, Wuhan, China<&wdkj&>PLAC, Key Laboratory of Quark & Lepton Physics (MOE), Central China Normal University, Wuhan, China
摘要：
The single-event effect (SEE) is a serious threat to electronics in radiation environments. The most important issue in radiation-hardening studies is the localization of the sensitive region in electronics to the SEE. To solve this problem, a prototype based on a complementary metal oxide semiconductor (CMOS) pixel sensor, i.e., Topmetal-M, was designed for SEE localization. A beam test was performed on the prototype at the radiation terminal of the Heavy Ion Research Facility in Lanzhou (HIRFL). The results indicated that the inherent deflection angle of the prototype to the beam was 1.7
$$^\circ$$
, and the angular resolution was 0.6
$$^\circ$$
. The prototype localized heavy ions with a position resolution of 3.4
$$\upmu$$
m.
作者机构：
[Duan She] Key Laboratory of Quark and Lepton Physics(MOE)and Institute of Particle Physics,Central China Normal University,Wuhan 430079,China;[Jinfeng Liao; Anping Huang; Duan She] Physics Department and Center for Exploration of Energy and Matter,Indiana University,Bloomington IN 47408,USA;[Duan She] Department of Modern Physics,University of Science and Technology of China,Hefei 230026,China;[Anping Huang] School of Nuclear Science and Technology,University of Chinese Academy of Sciences,Beijing 100049,China;[Defu Hou] 华中师范大学
通讯机构：
[Defu Hou] K;[Jinfeng Liao] P;Physics Department and Center for Exploration of Energy and Matter, Indiana University, Bloomington IN 47408, USA<&wdkj&>Key Laboratory of Quark and Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan 430079, China
摘要：
Hydrodynamics is a general theoretical framework for describ-ing the long-time large-distance behaviors of macroscopic physical systems.It has many important applications in various branches of physics,from cosmic expansion and galaxy/star evolutions at the very large scales to relativistic nuclear collisions at the very small scales.The core of hydrodynamics is about physical quantities pro-tected by exact conservation laws,such as energy,momentum and conserved charges.Past hydrodynamic studies almost entirely focus on the energy-momentum conservation and charge conser-vation.Only very recently,there has been a rapidly increasing interest in understanding the role of angular momentum conserva-tion in the hydrodynamic context and its implications for spin transport of underlying constituents.Such interest is strongly fueled by experimental observations of spin polarization in rotat-ing matter,with examples ranging from condensed matter flow systems to subatomic fluids in relativistic nuclear collisions[1-6].
摘要：
Spin alignments of vector mesons and hyperons in relativistic heavy-ion collisions have been proposed as signals of global polarization.The STAR experiment first observed the ∧ polarization.Recently,the ALICE collaboration measured the transverse momentum {PT) and the collision centrality dependence of K*,and Φ spin alignments during Pb-Pb collisions at 1/2sNN=2.76 TeV.A large signal is observed in the low pT region of mid-central collisions for K*,while the signal is much smaller for Φ,and these have not been understood yet.Since vector mesons have different lifetimes and their decay products have different scattering cross sections,they suffer from different hadronic effects.In this paper,we study the effect of hadronic interactions on the spin alignment of K*,Φ,and p mesons in relativistic heavy-ion collisions with a multi-phase transport model.We find that hadronic scatterings lead to a deviation of the observed spin alignment matrix element p00 away from the true value for p and K*mesons（with a bigger effect on p） while the effect is negligible for the Φ meson.The effect depends on the kinematic acceptance:the observed p00 value is lower than the true value when the pseudorapidity（η） coverage is small,while there is little effect when the η coverage is large.Hence,this study provides valuable information to understand the vector meson spin alignment signals observed during the experiments.
作者机构：
[LIU Sanjun; LU Wenjian] School of Information Engineering, Hubei Minzu University;College of Physical Science and Technology, Central China Normal University;[LAI Guohong] School of Information Engineering, Hubei Minzu University<&wdkj&>College of Physical Science and Technology, Central China Normal University
关键词：
co-frequency co-time full-duplex(CCFD);physical layer security;self-interference cancellation;security capacity;wire-line communication
摘要：
This paper presents a design scheme of wire-line telephone system using self-interference (SI) cancellation technology in co-frequency co-time full-duplex (CCFD) system to realize absolute secure communication at the physical layer. This scheme can hide the target signal by skillfully releasing the high-power artificial noise to the whole link at the receiving node, and then make use of the receiver's knowledge of the SI signal to achieve high dB SI cancellation with the help of analog domain SI cancellation technology in CCFD domain, so that the signal-to-noise ratio (SNR) received by the eavesdropper at any position of the link is far lower than that of the legitimate receiver, so as to realize the absolutely secure communication in the sense of Wyner principle. This paper not only puts forward the specific design scheme of absolutely secure communication telephone, but also analyzes the calculation of security capacity under different eavesdropping positions, different SI cancellation capability and different system parameters according to Shannon theory.
作者：
Aaij, R.;Beteta, C. Abellan;Adeva, B.;Adinolfi, M.;Aidala, C. A.;...
期刊：
中国物理C,2021年45(4):043001 ISSN：1674-1137
通讯作者：
Vieites Diaz, M.
作者机构：
[Ketel, T.; Mulder, M.; Tuning, N.; Hynds, D.; van Tilburg, J.; de Vries, J. A.; Veronesi, M.; Aaij, R.; Greim, R.; van Beuzekom, M.; Dufour, L.; Jans, E.; Bel, L. J.; Esen, S.; Dall'Occo, E.; Pellegrino, A.; Vitkovskiy, A.; Merk, M.; Archilli, F.; van Veghel, M.; Koppenburg, P.; Gras, C. Sanchez; Raven, G.; Sierra, C. Vazquez; Govorkova, E.; Kostiuk, I.; Benson, S.; Hulsbergen, W.] Nikhef Natl Inst Subat Phys, Amsterdam, Netherlands.;[Tourinho Jadallah Aoude, R.; Massafferri, A.; Cruz Torres, M.; De Miranda, J. M.; Soares Lavra, L.; Gomes, A.; Bediaga, I.; dos Reis, A. C.] CBPF, Rio De Janeiro, Brazil.;[Lopes, J. H.; Polycarpo, E.; Souza De Paula, B.; Gandelman, M.; Rangel, M. S.; Ferreira Rodrigues, F.; Otalora Goicochea, J. M.; Carvalho Akiba, K.; Silva de Oliveira, L.; De Paula, L.; Nasteva, I.; Da Cunha Marinho, F.; Amato, S.] Univ Fed Rio de Janeiro UFRJ, Rio De Janeiro, Brazil.;[Gao, Y.; Yang, Z.; Jiang, F.; Xu, A.; Ren, Z.; Tang, Z.; Xu, Z.; Wang, M.; Zhang, W. C.; Gu, C.; Sun, J.; Chen, C.; Zhu, X.; Davis, A.; Zhang, L.; Gan, Y.; Liu, X.] Tsinghua Univ, Ctr High Energy Phys, Beijing, Peoples R China.;[Li, Y.; Zhang, Y.; Wang, J.] Ihep, Beijing, Peoples R China.
通讯机构：
[Vieites Diaz, M.] U;Univ Santiago de Compostela, IGFAE, Santiago De Compostela, Spain.
关键词：
B physics;flavour physics;rare decay;omega - phi mixing;branching fraction
通讯机构：
[Yuxiang Zhao] I;Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China<&wdkj&>University of Chinese Academy of Sciences, Beijing, China
关键词：
electron ion collider;nucleon structure;nucleon mass;exotic hadronic states;quantum chromodynamics;3D-tomography;helicity;transverse momentum dependent parton distribution;generalized parton distribution;energy recovery linac;polarization;spin rotator
摘要：
Lepton scattering is an established ideal tool for studying inner structure of small particles such as nucleons as well as nuclei. As a future high energy nuclear physics project, an Electron-ion collider in China (EicC) has been proposed. It will be constructed based on an upgraded heavy-ion accelerator, High Intensity heavy-ion Accelerator Facility (HIAF) which is currently under construction, together with a new electron ring. The proposed collider will provide highly polarized electrons (with a polarization of ∼80%) and protons (with a polarization of ∼70%) with variable center of mass energies from 15 to 20 GeV and the luminosity of (2–3) × 1033 cm−2 · s−1. Polarized deuterons and Helium-3, as well as unpolarized ion beams from Carbon to Uranium, will be also available at the EicC. The main foci of the EicC will be precision measurements of the structure of the nucleon in the sea quark region, including 3D tomography of nucleon; the partonic structure of nuclei and the parton interaction with the nuclear environment; the exotic states, especially those with heavy flavor quark contents. In addition, issues fundamental to understanding the origin of mass could be addressed by measurements of heavy quarkonia near-threshold production at the EicC. In order to achieve the above-mentioned physics goals, a hermetical detector system will be constructed with cutting-edge technologies. This document is the result of collective contributions and valuable inputs from experts across the globe. The EicC physics program complements the ongoing scientific programs at the Jefferson Laboratory and the future EIC project in the United States. The success of this project will also advance both nuclear and particle physics as well as accelerator and detector technology in China.
摘要：
Several different transport processes, such as heat, momentum, and charge transports, may occur simultaneously in a thermal plasma system. The corresponding transport coefficients are heat conductivity, shear viscosity, and electric conductivity. In the present study, we investigate the color-electric conductivity of the quark-gluon plasma (QGP) in the presence of shear viscosity, focusing on the connection between the charge transport and momentum transport. To achieve this goal, we solve the viscous chromohydrodynamic equations obtained from the QGP kinetic theory associated with the distribution function modified by shear viscosity. According to the solved color fluctuations of hydrodynamic quantities, we obtain the induced color current through which the color-electric conductivity is derived. Numerical analysis shows that the conductivity properties of the QGP are mainly demonstrated by the longitudinal part of the color-electric conductivity. Shear viscosity has an appreciable impact on real and imaginary parts of the color-electric conductivity in some frequency regions.
