Contents
2020
Volume: 44 Issue 1
15 Article(s)
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Nuclear Physics
Deformed dispersion relation constraint with hydrogen atom 1S-2S transition *
Jin Pu, Guo-Ping Li, Qing-Quan Jiang, and Xiao-Tao Zu
We use the latest results of the ultra-high accuracy 1S-2S transition experiments in the hydrogen atom to constrain the forms of the deformed dispersion relation in the non-relativistic limit. For the leading correction of the non-relativistic limit, the experiment sets a limit at an order of magnitude for the desired We use the latest results of the ultra-high accuracy 1S-2S transition experiments in the hydrogen atom to constrain the forms of the deformed dispersion relation in the non-relativistic limit. For the leading correction of the non-relativistic limit, the experiment sets a limit at an order of magnitude for the desired Planck-scale level, thereby providing another example of the Planck-scale sensitivity in the study of the dispersion relation in controlled laboratory experiments. For the next-to-leading term, the bound is two orders of magnitude away from the Planck scale, however it still amounts to the best limit, in contrast to the previously obtained bound in the non-relativistic limit from the cold-atom-recoil experiments..
Chinese Physics C
- Publication Date: Jan. 01, 1900
- Vol. 44, Issue 1, (2020)
Measurement of the differential cross sections and angle-integrated cross sections of the 6Li(n, t)4He reaction from 1.0 eV to 3.0 MeV at the CSNS Back-n white neutron source *
Huaiyong Bai, Ruirui Fan, Haoyu Jiang, Zengqi Cui, Yiwei Hu, Guohui Zhang, Zhenpeng Chen, Wei Jiang, Han Yi, Jingyu Tang, Liang Zhou, Qi An, Jie Bao, Ping Cao, Qiping Chen, Yonghao Chen, Pinjing Cheng, Changqing Feng, Minhao Gu, Fengqin Guo, Changcai Han, Zijie Han, Guozhu He, Yongcheng He, Yuefeng He, Hanxiong Huang, Weiling Huang, Xiru Huang, Xiaolu Ji, Xuyang Ji, Hantao Jing, Ling Kang, Mingtao Kang, Bo Li, Lun Li, Qiang Li, Xiao Li, Yang Li, Yang Li, Rong Liu, Shubin Liu, Xingyan Liu, Guangyuan Luan, Yinglin Ma, Changjun Ning, Binbin Qi, Jie Ren, Xichao Ruan, Zhaohui Song, Hong Sun, Xiaoyang Sun, Zhijia Sun, Zhixin Tan, Hongqing Tang, Pengcheng Wang, Qi Wang, Taofeng Wang, Yanfeng Wang, Zhaohui Wang, Zheng Wang, Jie Wen, Zhongwei Wen, Qingbiao Wu, Xiaoguang Wu, Xuan Wu, Likun Xie, Yiwei Yang, Li Yu, Tao Yu, Yongji Yu, Jing Zhang, Linhao Zhang, Liying Zhang, Qingmin Zhang, Qiwei Zhang, Xianpeng Zhang, Yuliang Zhang, Zhiyong Zhang, Yingtan Zhao, Zuying Zhou, Danyang Zhu, Kejun Zhu, and Peng Zhu
The 6Li(n, t)4He reaction was measured as the first experiment involving neutron-induced charged particle emission reactions at the CSNS (China Spallation Neutron Source) Back-n white neutron source. The differential cross-sections of the 6Li(n,t)4He reaction at 15 detection angles ranging from 19.2° to 160.8°The 6Li(n, t)4He reaction was measured as the first experiment involving neutron-induced charged particle emission reactions at the CSNS (China Spallation Neutron Source) Back-n white neutron source. The differential cross-sections of the 6Li(n,t)4He reaction at 15 detection angles ranging from 19.2° to 160.8° are obtained from 1.0 eV to 3.0 MeV at 80 neutron energy points; for 50 energy points below 0.1 MeV they are reported for the first time. The results indicate that the anisotropy of the emitted tritium is noticeable above En = 100 eV. The angle-integrated cross-sections are also obtained. The present differential cross-sections agree in general with the previous evaluations, but there are some differences in the details. More importantly, the present results indicate that the cross-sections of the 6Li(n, t)4He reaction might be overestimated by most evaluations in the 0.5 - 3.0 MeV region, although they are recommended as standards below 1.0 MeV..
Chinese Physics C
- Publication Date: Jan. 01, 1900
- Vol. 44, Issue 1, (2020)
Isotopic cross-sections in proton induced spallation reactions based on the Bayesian neural network method *
Chun-Wang Ma, Dan Peng, Hui-Ling Wei, Zhong-Ming Niu, Yu-Ting Wang, and R. Wada
The Bayesian neural network (BNN) method is proposed to predict the isotopic cross-sections in proton induced spallation reactions. Learning from more than 4000 data sets of isotopic cross-sections from 19 experimental measurements and 5 theoretical predictions with the SPACS parametrization, in which the mass of the sThe Bayesian neural network (BNN) method is proposed to predict the isotopic cross-sections in proton induced spallation reactions. Learning from more than 4000 data sets of isotopic cross-sections from 19 experimental measurements and 5 theoretical predictions with the SPACS parametrization, in which the mass of the spallation system ranges from 36 to 238, and the incident energy from 200 MeV/u to 1500 MeV/u, it is demonstrated that the BNN method can provide good predictions of the residue fragment cross-sections in spallation reactions..
Chinese Physics C
- Publication Date: Jan. 01, 1900
- Vol. 44, Issue 1, (2020)
Constituent quark number scaling from strange hadron spectra in pp collisions at TeV *
Jian-Wei Zhang, Hai-Hong Li, Feng-Lan Shao, and Jun Song
We show that the spectra of and at midrapidity in the inelastic events in collisions at 13 TeV exhibit a constituent quark number scaling property, which is a clear signal of quark combination mechanism at hadronization. We use a quark combination model with equal velocity combination approximation to systematically stWe show that the
Chinese Physics C
- Publication Date: Jan. 01, 1900
- Vol. 44, Issue 1, (2020)
Antiproton production in heavy-ion collisions at subthreshold energies *
Zhao-Qing Feng
Within the framework of the Lanzhou quantum molecular dynamics model, the deep subthreshold antiproton production in heavy-ion collisions has been investigated thoroughly. The elastic scattering, annihilation and charge exchange reactions associated with antiproton channels are implemented in the model. The attractive Within the framework of the Lanzhou quantum molecular dynamics model, the deep subthreshold antiproton production in heavy-ion collisions has been investigated thoroughly. The elastic scattering, annihilation and charge exchange reactions associated with antiproton channels are implemented in the model. The attractive antiproton potential extracted from the G-parity transformation of nucleon selfenergies reduces the threshold energies in meson-baryon and baryon-baryon collisions, and consequently enhances the antiproton yields to some extent. The calculated invariant spectra are consistent with the available experimental data. The primordial antiproton yields increase with the mass number of the colliding system. However, annihilation reactions reduce the antiproton production which becomes independent of the colliding partners. Anti-flow phenomena of antiprotons correlated with the mean field potential and annihilation mechanism is found by comparing them with the proton flows. Possible experiments at the high-intensity heavy-ion accelerator facility (HIAF) in China are discussed..
Chinese Physics C
- Publication Date: Jan. 01, 1900
- Vol. 44, Issue 1, (2020)
Search for QCD critical point by transverse velocity dependence of anti-deuteron to deuteron ratio *
Ning Yu, Dingwei Zhang, and Xiaofeng Luo
We propose the transverse velocity ( ) dependence of the anti-deuteron to deuteron ratio as a new observable to search for the QCD critical point in heavy-ion collisions. The QCD critical point can attract the system evolution trajectory in the QCD phase diagram, which is known as the focusing effect. To quantify this We propose the transverse velocity (
Chinese Physics C
- Publication Date: Jan. 01, 1900
- Vol. 44, Issue 1, (2020)
Skyrmion stability at finite isospin chemical potential and temperature *
Wen-Li Yuan, Zhen-Ni Xu, Jin-Li Zhang, and Hong-Shi Zong
The skyrmion stability at finite isospin chemical potential is studied using the Skyrme Lagrangian with a finite pion mass . A critical value , above which a stable soliton does not exist, is found. We also explore some properties of the skyrmion as function of , i.e., the isoscalar rms radius and the isoscalar magnetiThe skyrmion stability at finite isospin chemical potential
Chinese Physics C
- Publication Date: Jan. 01, 1900
- Vol. 44, Issue 1, (2020)
Particle and Nuclear Astrophysics and Cosmology
Scalar field in massive BTZ black hole and entanglement entropy *
Yu-Ting Zhou, and Xiao-Mei Kuang
In this paper, we investigate the quantum scalar fields in a massive BTZ black hole background. We study the entropy of the system by evaluating the entanglement entropy using a discretized approach. Specifically, we fit the results with a log -modified formula of the black hole entropy, which is introduced by quantum In this paper, we investigate the quantum scalar fields in a massive BTZ black hole background. We study the entropy of the system by evaluating the entanglement entropy using a discretized approach. Specifically, we fit the results with a log -modified formula of the black hole entropy, which is introduced by quantum correction. The coefficients of leading and sub-leading terms affected by the mass of graviton are numerically analyzed..
Chinese Physics C
- Publication Date: Jan. 01, 1900
- Vol. 44, Issue 1, (2020)
Weak cosmic censorship conjecture in BTZ black holes with scalar fields *
Deyou Chen
The weak cosmic censorship conjecture in the near-extremal BTZ black hole has been tested using test particles and fields. It has been claimed that such a black hole can be overspun. In this paper, we review the thermodynamics and weak cosmic censorship conjecture in BTZ black holes using the scattering of a scalar fieThe weak cosmic censorship conjecture in the near-extremal BTZ black hole has been tested using test particles and fields. It has been claimed that such a black hole can be overspun. In this paper, we review the thermodynamics and weak cosmic censorship conjecture in BTZ black holes using the scattering of a scalar field. The first law of thermodynamics in the non-extremal BTZ black hole is recovered. For the extremal and near-extremal black holes, due to the divergence of the variation of entropy, we test the weak cosmic censorship conjecture by evaluating the minimum of the function f, and find that both the extremal and near-extremal black holes cannot be overspun..
Chinese Physics C
- Publication Date: Jan. 01, 1900
- Vol. 44, Issue 1, (2020)
Tunneling of massive vector particles under influence of quantum gravity *
Wajiha Javed, Riasat Ali, Rimsha Babar, and Ali Övgün
This study set out to investigate charged vector particles tunneling via horizons of a pair of accelerating rotating charged NUT black holes under the influence of quantum gravity. To this end, we use the modified Proca equation incorporating generalized uncertainty principle. Applying the WKB approximation to the fielThis study set out to investigate charged vector particles tunneling via horizons of a pair of accelerating rotating charged NUT black holes under the influence of quantum gravity. To this end, we use the modified Proca equation incorporating generalized uncertainty principle. Applying the WKB approximation to the field equation, we obtain a modified tunneling rate and the corresponding corrected Hawking temperature for this black hole. Moreover, we analyze the graphical behavior of the corrected Hawking temperature
Chinese Physics C
- Publication Date: Jan. 01, 1900
- Vol. 44, Issue 1, (2020)
Particles and Fields
Measurements of decay branching fractions of in associated production at the CEPC *
Yu Bai, Chun-Hui Chen, Ya-Quan Fang, Gang Li, Man-Qi Ruan, Jing-Yuan Shi, Bo Wang, Pan-Yu Kong, Bo-Yang Lan, and Zhan-Feng Liu
The high-precision measurement of Higgs boson properties is one of the primary goals of the Circular Electron Positron Collider (CEPC). The measurements of decay branching fraction in the CEPC experiment is presented, considering a scenario of analysing 5000 fb-1 collision data with the center-of-mass energy of 250 GeVThe high-precision measurement of Higgs boson properties is one of the primary goals of the Circular Electron Positron Collider (CEPC). The measurements of
Chinese Physics C
- Publication Date: Jan. 01, 1900
- Vol. 44, Issue 1, (2020)
Polarization in decays *
Tong-Zhu Han, Rong-Gang Ping, Tao Luo, and Guang-Zhi Xu
Measurements of decay asymmetry parameters of charmed baryons, e.g., , provide more data to test the W-emission and W-exchange mechanisms controlled by strong and weak interactions. Taking advantage of the spin polarization in charmed baryon decays, we investigate the possibility to measure weak decay asymmetry parametMeasurements of decay asymmetry parameters of charmed baryons, e.g.,
Chinese Physics C
- Publication Date: Jan. 01, 1900
- Vol. 44, Issue 1, (2020)
The semileptonic decay within the LCSR approach under heavy quark effective field theory *
Rui-Yu Zhou, Lei Guo, Hai-Bing Fu, Wei Cheng, and Xing-Gang Wu
The heavy quark effective field theory (HQEFT) provides an effective way to deal with heavy meson decays. In this paper, we adopt two different correlators to derive the light-cone sum rules (LCSR) for the transition form factors (TFFs) in the framework of HQEFT. We label the two LCSR results as LCSR- and LCSR- , whichThe heavy quark effective field theory (HQEFT) provides an effective way to deal with heavy meson decays. In this paper, we adopt two different correlators to derive the light-cone sum rules (LCSR) for the
Chinese Physics C
- Publication Date: Jan. 01, 1900
- Vol. 44, Issue 1, (2020)
Mass spectra and wave functions of the doubly heavy baryons with JP=1+ heavy diquark cores *
Qiang Li, Chao-Hsi Chang, Si-Xue Qin, and Guo-Li Wang
Mass spectra and wave functions of the doubly heavy baryons are computed assuming that the two heavy quarks inside a baryon form a compact heavy ‘diquark core’ in a color anti-triplet, and bind with the remaining light quark into a colorless baryon. The two reduced two-body problems are described by the relativistic BeMass spectra and wave functions of the doubly heavy baryons are computed assuming that the two heavy quarks inside a baryon form a compact heavy ‘diquark core’ in a color anti-triplet, and bind with the remaining light quark into a colorless baryon. The two reduced two-body problems are described by the relativistic Bethe-Salpeter equations (BSEs) with the relevant QCD inspired kernels. We focus on the doubly heavy baryons with
Chinese Physics C
- Publication Date: Jan. 01, 1900
- Vol. 44, Issue 1, (2020)
A holographic description of theta-dependent Yang-Mills theory at finite temperature *
Si-Wen Li
Theta-dependent gauge theories can be studied using holographic duality through string theory in certain spacetimes. By this correspondence we consider a stack of N0 dynamical D0-branes as D-instantons in the background sourced by Nc coincident non-extreme black D4-branes. According to the gauge-gravity duality, this DTheta-dependent gauge theories can be studied using holographic duality through string theory in certain spacetimes. By this correspondence we consider a stack of N0 dynamical D0-branes as D-instantons in the background sourced by Nc coincident non-extreme black D4-branes. According to the gauge-gravity duality, this D0-D4 brane system corresponds to Yang-Mills theory with a theta angle at finite temperature. We solve the IIA supergravity action by taking account into a sufficiently small backreaction of the Dinstantons and obtain an analytical solution for our D0-D4-brane configuration. Subsequently, the dual theory in the large Nc limit can be holographically investigated with the gravity solution. In the dual field theory, we find that the coupling constant exhibits asymptotic freedom, as is expected in QCD. The contribution of the theta-dependence to the free energy gets suppressed at high temperatures, which is basically consistent with the calculation using the Yang-Mills instanton. The topological susceptibility in the large Nc limit vanishes, and this behavior remarkably agrees with the implications from the simulation results at finite temperature. Moreover, we finally find a geometrical interpretation of the theta-dependence in this holographic system..
Chinese Physics C
- Publication Date: Jan. 01, 1900
- Vol. 44, Issue 1, 013103 (2020)
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