Chinese Physics C最新文献_第6页

Mass suppression effect in QCD radiation and hadron angular distribution in jet QCD 辐射中的质量抑制效应和射流中的强子角分布

Chinese Physics C Pub Date : 2024-01-17 DOI: 10.1088/1674-1137/ad2f22

Chuanhui Jiang, Hai Tao Li, Shi-Yuan Li, Zong-Guo Si

{"title":"Mass suppression effect in QCD radiation and hadron angular distribution in jet","authors":"Chuanhui Jiang, Hai Tao Li, Shi-Yuan Li, Zong-Guo Si","doi":"10.1088/1674-1137/ad2f22","DOIUrl":"https://doi.org/10.1088/1674-1137/ad2f22","url":null,"abstract":"\u0000 The finite mass of the heavy quark suppresses the collimated radiations, which is generally referred to as the dead cone effect. In this paper, we study the distribution of hadron multiplicity over the hadron opening angle with respect to the jet axis in various flavors of jets. The corresponding measurement can be the most straightforward and simplest to explore the dynamical evolution of the radiations in the corresponding jet, which can expose the mass effect. We also propose the transverse energy-weighted angular distribution which sheds light on the interplay between perturbative and nonperturbative effects in the radiation. With Monte-Carlo simulations, our calculation shows that the dead cone effect can be clearly seen by taking the ratio between the b jet and the light-quark (inclusive) jet, promising to be measured at the LHC in the future. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.","PeriodicalId":504778,"journal":{"name":"Chinese Physics C","volume":"15 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140505530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Exploring dark matter-gauge boson effective interactions at the current and future colliders 在当前和未来的对撞机上探索暗物质-量规玻色子的有效相互作用

Chinese Physics C Pub Date : 2024-01-14 DOI: 10.1088/1674-1137/ad2362

Yu Zhang, Yi-Wei Huang, Wei-Tao Zhang, Mao Song, Ran Ding

{"title":"Exploring dark matter-gauge boson effective interactions at the current and future colliders","authors":"Yu Zhang, Yi-Wei Huang, Wei-Tao Zhang, Mao Song, Ran Ding","doi":"10.1088/1674-1137/ad2362","DOIUrl":"https://doi.org/10.1088/1674-1137/ad2362","url":null,"abstract":"\u0000 In this work, we investigate the collider constraints on effective interactions between Dark Matter (DM) particles and electroweak gauge bosons in a systematic way. We consider the simplified models in which scalar or Dirac fermion DM candidates only couple to electroweak gauge bosons through high dimensional effective operators. Taking into account the induced DM-quarks and DM-gluons operators from the Renormalization Group Evolution (RGE) running effect, we present comprehensive constraints on effective energy scale $Lambda$ and Wilson coefficients $C_B(Lambda),,C_W(Lambda)$ from direct detection, indirect detection, and collider searches. In particular, we present the corresponding sensitivity from the Large Hadron Electron Collider (LHeC) and the Future Circular Collider in electron-proton mode (FCC-ep) for the first time, update the mono-$j$ and mono-$gamma$ search limits at the Large Hadron Collider (LHC), and derive the new limits at the Circular Electron Positron Collider (CEPC). Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.","PeriodicalId":504778,"journal":{"name":"Chinese Physics C","volume":"41 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140508860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Proton-neutron symplectic model description of $^{106}$Cd 镉的质子-中子交映模型描述

Chinese Physics C Pub Date : 2024-01-11 DOI: 10.1088/1674-1137/ad1d4b

H. Ganev

引用次数: 0

Radiative Capture of proton 14N(p,γ)15O at Low Energy 质子 14N(p,γ)15O 的低能量辐射俘获

Chinese Physics C Pub Date : 2024-01-05 DOI: 10.1088/1674-1137/ad1b3c

B. Irgaziev, A. Kabir, J. Nabi

{"title":"Radiative Capture of proton 14N(p,γ)15O at Low Energy","authors":"B. Irgaziev, A. Kabir, J. Nabi","doi":"10.1088/1674-1137/ad1b3c","DOIUrl":"https://doi.org/10.1088/1674-1137/ad1b3c","url":null,"abstract":"\u0000 The CNO cycle is the main source of energy in stars more massive than our Sun. It defines the energy production and the duration contributes in determining the lifetime of massive stars. The cycle is an important tool for the determination of the age of globular clusters. Radiative capture p + 14N →15O + γ, at energies of astrophysical interest, is one of the important processes in the CNO cycle. In this project, we apply a potential model to describe both non-resonant and resonant reactions in the channels where radiative capture occurs through electric E1 transitions. We employed the R-matrix method to describe the reactions going via M1 resonant transitions, when it was not possible to correctly reproduce the experimental data by a potential model. The partial components of the astrophysical S-factor were calculated for all possible electric and magnetic dipole transitions in 15O. The linear extrapolated S-factor at zero energy (S(0)) is in good agreement with earlier reported values for all types of transitions considered in this work. Based on the value of the total astrophysical S-factor, depending on the collision energy, we calculate the nuclear reaction rates for p + 14N →15O + γ. The computed rates are in good agreement with the results of the NACRE II Collaboration.","PeriodicalId":504778,"journal":{"name":"Chinese Physics C","volume":"8 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139382020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Complexity growth in a holographic QCD model 全息 QCD 模型的复杂性增长

Chinese Physics C Pub Date : 2024-01-05 DOI: 10.1088/1674-1137/ad1b3e

Wen-Bin Chang, De-fu Hou

引用次数: 0

Empirical model for fusion cross sections of Ca-induced reactions. 钙诱导反应聚变截面的经验模型。

Chinese Physics C Pub Date : 2024-01-04 DOI: 10.1088/1674-1137/ad1a97

R. L., N. Sowmya, Sridhar K.N, Manjunatha Hc

引用次数: 0

$J/psi$ Pair Hadroproduction at Next-to-Leading Order in Nonrelativistic-QCD at ATLAS 在ATLAS的非相对论-QCD中实现次领先阶的$J/psi$ 成对前向生产

Chinese Physics C Pub Date : 2024-01-04 DOI: 10.1088/1674-1137/ad1a98

liping Sun

引用次数: 0

Ground-state mass of 22Al and test of state-of-the-art ab initio calculations 22Al 的基态质量和对最先进的 ab initio 计算的检验

Chinese Physics C Pub Date : 2024-01-03 DOI: 10.1088/1674-1137/ad1a0a

Ming-Ze Sun, Yue Yu, Xinpeng Wang, Meng 王猛 Wang, Jianguo Li, Yu-Hu 张玉虎 Zhang, klaus blaum, Zuyi Chen, Rui-Jiu Chen, Han-Yu Deng, Chaoyi Fu, Wenwen Ge, W. Huang, Hongyang Jiao, Honghui Li, H. Li, Yinfang Luo, Ting Liao, Y. Litvinov, Min Si, Peng Shuai, Jin-Yang Shi, Qian Wang, Yuanming Xing, X. Xu, Hu-Shan 徐瑚珊 Xu, Fu-Rong 许甫荣 Xu, Qi Yuan, Takayuki Yamaguchi, Xinliang Yan, Jianxin Yang, You-Jin 原有进 Yuan, Xiao-Hong 周小红 Zhou, Xu Zhou, Min Zhang, Qi Zeng

{"title":"Ground-state mass of 22Al and test of state-of-the-art ab initio calculations","authors":"Ming-Ze Sun, Yue Yu, Xinpeng Wang, Meng 王猛 Wang, Jianguo Li, Yu-Hu 张玉虎 Zhang, klaus blaum, Zuyi Chen, Rui-Jiu Chen, Han-Yu Deng, Chaoyi Fu, Wenwen Ge, W. Huang, Hongyang Jiao, Honghui Li, H. Li, Yinfang Luo, Ting Liao, Y. Litvinov, Min Si, Peng Shuai, Jin-Yang Shi, Qian Wang, Yuanming Xing, X. Xu, Hu-Shan 徐瑚珊 Xu, Fu-Rong 许甫荣 Xu, Qi Yuan, Takayuki Yamaguchi, Xinliang Yan, Jianxin Yang, You-Jin 原有进 Yuan, Xiao-Hong 周小红 Zhou, Xu Zhou, Min Zhang, Qi Zeng","doi":"10.1088/1674-1137/ad1a0a","DOIUrl":"https://doi.org/10.1088/1674-1137/ad1a0a","url":null,"abstract":"\u0000 The ground-state mass excess of the Tz = −2 drip-line nucleus 22Al is measured for the first time to be 18103(10) keV using the newly-developed Bρ-defined isochronous mass spectrometry method at the cooler storage ring in Lanzhou. The new mass excess value allowed us to determine the excitation energies of the two low-lying 1+ states in 22Al with significantly reduced uncertainties of 51 keV. Comparing to the analogue states in its mirror nucleus 22F, the mirror energy differences of the two 1+ states in the 22Al-22F mirror pair are determined to be −625(51) keV and −330(51) keV, respectively. The excitation energies and the mirror energy differences are used to test the state-of-the-art ab initio valence-space in-medium similarity renormalization group calculations with four sets of interactions derived from the chiral effective field theory. The mechanism leading to the large mirror energy differences is investigated and attributed to the occupation of the πs1/2 orbital.","PeriodicalId":504778,"journal":{"name":"Chinese Physics C","volume":"36 31","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139388773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Constraints on Axion-like Particles from the Observation of Galactic Sources by LHAASO 从 LHAASO 观测银河源得出的类轴子粒子约束条件

Chinese Physics C Pub Date : 2024-01-03 DOI: 10.1088/1674-1137/ad361e

Jun Li, Xiao-Jun Bi, Lin-Qing Gao, Xiaoyuan Huang, Run-Min Yao, P. Yin

{"title":"Constraints on Axion-like Particles from the Observation of Galactic Sources by LHAASO","authors":"Jun Li, Xiao-Jun Bi, Lin-Qing Gao, Xiaoyuan Huang, Run-Min Yao, P. Yin","doi":"10.1088/1674-1137/ad361e","DOIUrl":"https://doi.org/10.1088/1674-1137/ad361e","url":null,"abstract":"\u0000 High-energy photons may oscillate with axion-like particles (ALPs) when they propagate through the Milky Way's magnetic field, resulting in an alteration in the observed photon energy spectrum. The ultra-high energy gamma-ray spectra, measured by the Large High Altitude Air Shower Observatory (LHAASO) up to $mathcal{O}(1)~mathrm{PeV}$, provide a promising opportunity to investigate the ALP-photon oscillation effect. In this study, we utilize the gamma-ray spectra of four Galactic sources measured by LHAASO, including the Crab Nebula, LHAASO J2226+6057, LHAASO J1908+0621, and LHAASO J1825-1326, to explore this effect. We employ the $rm CL_s$ method to set constraints on the ALP parameters. Combing the observations of the four sources, our analysis reveals that the ALP-photon coupling $g_{agamma}$ is constrained to be smaller than $1.4times10^{-10}$ ${rm GeV}^{-1}$ for the ALP mass of $sim 4times10^{-7} ~mathrm{eV}$ at the 95% C.L. By combing the observations of the Crab Nebula from LHAASO and other experiments, we find that the ALP-photon coupling could be set to be about $7.5times10^{-11}$ ${rm GeV}^{-1}$ for the ALP mass $sim 4 times10^{-7}~mathrm{eV}$ , which is in close proximity to the CAST constraint.","PeriodicalId":504778,"journal":{"name":"Chinese Physics C","volume":"150 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140514636","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of the Brink-Axel Hypothesis on Unique First-Forbidden β-transitions for r-process nuclei 布林克-阿克塞尔假说对r过程核独特的首禁β转变的影响

Chinese Physics C Pub Date : 2023-12-28 DOI: 10.1088/1674-1137/ad1925

Fakeha Farooq, J. Nabi, Ramoona Shehzadi

{"title":"Impact of the Brink-Axel Hypothesis on Unique First-Forbidden β-transitions for r-process nuclei","authors":"Fakeha Farooq, J. Nabi, Ramoona Shehzadi","doi":"10.1088/1674-1137/ad1925","DOIUrl":"https://doi.org/10.1088/1674-1137/ad1925","url":null,"abstract":"Key nuclear inputs for the astrophysical r-process simulations are the weak interaction rates. Consequently, the accuracy of these inputs directly affects the reliability of nucleosynthesis modeling. Majority of the stellar rates, used in simulation studies, are calculated invoking the Brink-Axel (BA) hypothesis. The BA hypothesis assumes that the strength functions of all parent excited states are the same as for the ground state, only shifted in energies. However, BA hypothesis has to be tested against microscopically calculated state-by-state rates. In this project we study the impact of the BA hypothesis on calculated stellar β--decay and electron capture rates. Our investigation include both Unique First Forbidden (U1F) and allowed transitions for 106 neutron-rich trans-iron nuclei ([27, 77] ≤ [Z, A] ≤ [82, 208]). The calculations were performed using the deformed proton-neutron quasi-particle random-phase approximation (pn-QRPA) model with a simple plus quadrupole separable and schematic interaction. Waiting-point and several key r-process nuclei lie within the considered mass region of the nuclear chart. We computed electron capture and β--decay rates using two different prescriptions for strength functions. One was based by invoking BA hypothesis and the other was the state-by-state calculation of strength functions, under stellar density and temperature conditions ([10, 1] ≤ [ρYe(g/cm3), T(GK)] ≤ [1011, 30]). Our results show that BA hypothesis invoked U1F β-− rates are overestimated by 4–5 orders of magnitude as compared to microscopic rates. For capture rates, more than 2 orders of magnitude difference was noted when applying BA hypothesis. It was concluded that the BA hypothesis is not a reliable approximation, especially for the β--decay forbidden transitions.","PeriodicalId":504778,"journal":{"name":"Chinese Physics C","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139150752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0