物理与天体物理最新文献

{"title":"Masses and decays of triply-heavy pentaquarks* * D. J. is Supported by the National Natural Science Foundation of China (12165017)","authors":"Chang-Le Liu, Wen-Xuan Zhang, Duo-Jie Jia","doi":"10.1088/1674-1137/ad595a","DOIUrl":"https://doi.org/10.1088/1674-1137/ad595a","url":null,"abstract":"In this study, we analyzed masses and decays of triply-heavy pentaquarks <inline-formula>\u0000<tex-math><?CDATA $QQQnbar{n}~(Q=b,c)$?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_103110_M1.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> in the unified MIT bag model. We construct the color-spin wave functions of the triply-heavy pentaquarks and use the numerical variational method to compute all the ground-state masses of these systems. By excluding the scattering states in configuration spsce, we computed the decay width ratios of each decay channel relative to the maximum width for the compact pentaquark states, obtaining the main decay modes of the triply-heavy pentaquark systems.","PeriodicalId":10250,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":3.6,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142175510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Testing Bell inequality through at CEPC* * Tong Li is Supported by the National Natural Science Foundation of China (12375096, 12035008, 11975129), and \"the Fundamental Research Funds for the Central Universities\", Nankai University (63196013). Kai Ma was supported by the Natural Science Basic Research Program of Shaanxi Province, China (2023-JC-YB-041) and the Innovation Capability Support Program of Shaanxi Province, China (2021KJXX-47)","authors":"Kai Ma, Tong Li","doi":"10.1088/1674-1137/ad62d8","DOIUrl":"https://doi.org/10.1088/1674-1137/ad62d8","url":null,"abstract":"The decay of Higgs boson into two spin-1/2 particles provides an ideal system to reveal quantum entanglement and Bell-nonlocality. Future <inline-formula>\u0000<tex-math><?CDATA $ e^+e^- $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_103105_M2.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> colliders can improve the measurement accuracy of the spin correlation of tau lepton pairs from Higgs boson decay. We show the testability of Bell inequality through <inline-formula>\u0000<tex-math><?CDATA $ h{rightarrow} tautau $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_103105_M3.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> at Circular Electron Positron Collider (CEPC). Two realistic methods of testing Bell inequality are investigated, <italic toggle=\"yes\">i.e</italic>., Törnqvist's method and Clauser-Home-Shimony-Holt (CHSH) inequality. In the simulation, we consider the detector effects of CEPC including uncertainties for tracks and jets from <italic toggle=\"yes\">Z</italic> boson in the production of <inline-formula>\u0000<tex-math><?CDATA $ e^+e^-{rightarrow} Zh $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_103105_M4.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>. Necessary reconstruction approaches are described to measure quantum entanglement between <inline-formula>\u0000<tex-math><?CDATA $ tau^+ $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_103105_M5.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> and <inline-formula>\u0000<tex-math><?CDATA $ tau^- $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_103105_M6.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>. Finally, we show the sensitivity of CEPC to Bell inequality violation for the two methods.","PeriodicalId":10250,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":3.6,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142175495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Radiative leptonic decay of heavy quarkonia* * Supported by the National Natural Science Foundation of China (12247119, 12042507)","authors":"Junle Pei, Xinchou Lou, Yaquan Fang, Jinfei Wu, Manqi Ruan","doi":"10.1088/1674-1137/ad6552","DOIUrl":"https://doi.org/10.1088/1674-1137/ad6552","url":null,"abstract":"In this study, the properties of heavy quarkonia &lt;italic toggle=\"yes\"&gt;X&lt;/italic&gt; are examined by treating them as bound states of &lt;italic toggle=\"yes\"&gt;Q&lt;/italic&gt; and &lt;inline-formula&gt;\u0000&lt;tex-math&gt;&lt;?CDATA $ bar{Q} $?&gt;&lt;/tex-math&gt;\u0000&lt;inline-graphic xlink:href=\"cpc_48_10_103108_M1.jpg\" xlink:type=\"simple\"&gt;&lt;/inline-graphic&gt;\u0000&lt;/inline-formula&gt; at the leading-order level within the non-relativistic quantum chromodynamics (NRQCD) framework, where &lt;italic toggle=\"yes\"&gt;Q&lt;/italic&gt; represents either a charm or bottom quark. The branching ratios for the radiative leptonic decays &lt;inline-formula&gt;\u0000&lt;tex-math&gt;&lt;?CDATA $ Xrightarrow gamma l^{+} l^{-} $?&gt;&lt;/tex-math&gt;\u0000&lt;inline-graphic xlink:href=\"cpc_48_10_103108_M2.jpg\" xlink:type=\"simple\"&gt;&lt;/inline-graphic&gt;\u0000&lt;/inline-formula&gt; are revisited, and the angular and energy/momentum distributions of the final state particles are analyzed in the rest frame of &lt;italic toggle=\"yes\"&gt;X&lt;/italic&gt;. Furthermore, we apply Lorentz transformations from the rest frame of &lt;italic toggle=\"yes\"&gt;X&lt;/italic&gt; to the center-of-mass frame of &lt;inline-formula&gt;\u0000&lt;tex-math&gt;&lt;?CDATA $ l^+ l^- $?&gt;&lt;/tex-math&gt;\u0000&lt;inline-graphic xlink:href=\"cpc_48_10_103108_M3.jpg\" xlink:type=\"simple\"&gt;&lt;/inline-graphic&gt;\u0000&lt;/inline-formula&gt; to establish the connection between the widths &lt;inline-formula&gt;\u0000&lt;tex-math&gt;&lt;?CDATA $ {Gamma_{X rightarrow gamma l^{+} l^{-}}} $?&gt;&lt;/tex-math&gt;\u0000&lt;inline-graphic xlink:href=\"cpc_48_10_103108_M4.jpg\" xlink:type=\"simple\"&gt;&lt;/inline-graphic&gt;\u0000&lt;/inline-formula&gt; and &lt;inline-formula&gt;\u0000&lt;tex-math&gt;&lt;?CDATA $ {Gamma_{X rightarrow l^{+} l^{-}}} $?&gt;&lt;/tex-math&gt;\u0000&lt;inline-graphic xlink:href=\"cpc_48_10_103108_M5.jpg\" xlink:type=\"simple\"&gt;&lt;/inline-graphic&gt;\u0000&lt;/inline-formula&gt;. The comparison of the connection to those documented in literature (divided by &lt;inline-formula&gt;\u0000&lt;tex-math&gt;&lt;?CDATA $ 2pi $?&gt;&lt;/tex-math&gt;\u0000&lt;inline-graphic xlink:href=\"cpc_48_10_103108_M6.jpg\" xlink:type=\"simple\"&gt;&lt;/inline-graphic&gt;\u0000&lt;/inline-formula&gt;) for various &lt;italic toggle=\"yes\"&gt;X&lt;/italic&gt; states, such as &lt;inline-formula&gt;\u0000&lt;tex-math&gt;&lt;?CDATA $ J/Psi $?&gt;&lt;/tex-math&gt;\u0000&lt;inline-graphic xlink:href=\"cpc_48_10_103108_M7.jpg\" xlink:type=\"simple\"&gt;&lt;/inline-graphic&gt;\u0000&lt;/inline-formula&gt;, &lt;inline-formula&gt;\u0000&lt;tex-math&gt;&lt;?CDATA $ Psi(2S) $?&gt;&lt;/tex-math&gt;\u0000&lt;inline-graphic xlink:href=\"cpc_48_10_103108_M8.jpg\" xlink:type=\"simple\"&gt;&lt;/inline-graphic&gt;\u0000&lt;/inline-formula&gt;, &lt;inline-formula&gt;\u0000&lt;tex-math&gt;&lt;?CDATA $ Upsilon(1S) $?&gt;&lt;/tex-math&gt;\u0000&lt;inline-graphic xlink:href=\"cpc_48_10_103108_M9.jpg\" xlink:type=\"simple\"&gt;&lt;/inline-graphic&gt;\u0000&lt;/inline-formula&gt;, and &lt;inline-formula&gt;\u0000&lt;tex-math&gt;&lt;?CDATA $ Upsilon(2S) $?&gt;&lt;/tex-math&gt;\u0000&lt;inline-graphic xlink:href=\"cpc_48_10_103108_M10.jpg\" xlink:type=\"simple\"&gt;&lt;/inline-graphic&gt;\u0000&lt;/inline-formula&gt;, shows relative differences typically around or below 10%, comparable to the next-to-leading order corrections of &lt;inline-formula&gt;\u0000&lt;tex-math&gt;&lt;?CDATA $ O(alpha) $?&gt;&lt;/tex-math&gt;\u0000&lt;inline-graphic xlink:href=\"cpc_48_10_103108_M11.jpg\" xlink:type=\"simple\"&gt;&lt;/inline-graphic&gt;\u0000&lt;/inline-formula&gt; and &lt;inline-formula&gt;\u0000&lt;tex-math&gt;&lt;?CDATA $ O(v^4) $?","PeriodicalId":10250,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":3.6,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142175497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ground states and first radial excitations of vector tetraquark states with explicit P-waves via QCD sum rules* * Supported by the National Natural Science Foundation of China (12175068)","authors":"Zhi-Gang Wang","doi":"10.1088/1674-1137/ad5ae5","DOIUrl":"https://doi.org/10.1088/1674-1137/ad5ae5","url":null,"abstract":"In this study, we chose the diquark-antidiquark type four-quark currents with an explicit <italic toggle=\"yes\">P</italic>-wave between the diquark and antidiquark pairs to study the ground states and first radial excitations of the hidden-charm tetraquark states with quantum numbers <inline-formula>\u0000<tex-math><?CDATA $J^{PC}=1^{--}$?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_103103_M1.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>. We also obtained the lowest vector tetraquark masses and made possible assignments of the existing <inline-formula>\u0000<tex-math><?CDATA $Y$?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_103103_M2.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>states. There indeed exists a hidden-charm tetraquark state with <inline-formula>\u0000<tex-math><?CDATA $J^{PC}=1^{--}$?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_103103_M3.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> at an energy of approximately 4.75 GeV as the first radial excitation that accounts for the BESIII data.","PeriodicalId":10250,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":3.6,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142175514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"B c meson and its scalar cousin with QCD sum rules* * Supported by the National Natural Science Foundation, China (12175068)","authors":"Zhi-Gang Wang","doi":"10.1088/1674-1137/ad5a71","DOIUrl":"https://doi.org/10.1088/1674-1137/ad5a71","url":null,"abstract":"In this study, we use the optical theorem to calculate the next-to-leading order corrections to the QCD spectral densities directly in the QCD sum rules for the pseudoscalar and scalar <italic toggle=\"yes\">B</italic>\u0000_{\u0000<italic toggle=\"yes\">c</italic>\u0000} mesons. We use experimental data for guidance to perform an updated analysis. We obtain the masses and, in particular, decay constants, which are the fundamental input parameters in high energy physics. Ultimately, we obtain the pure leptonic decay widths, which can be compared with experimental data in the future.","PeriodicalId":10250,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":3.6,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142175515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Inner fission barriers of uranium isotopes in the deformed relativistic Hartree-Bogoliubov theory in continuum* * This work was partly supported by the Natural Science Foundation of Henan Province, China (242300421156, 202300410480), the National Natural Science Foundation of China (12141501, U2032141, 11935003), the State Key Laboratory of Nuclear Physics and Technology, Peking University (NPT2023ZX03), the Super Computing Center of Beijing Normal University, and High-performance Computing Platform of Peking University","authors":"Wei Zhang, Jin-Ke Huang, Ting-Ting Sun, Jing Peng, Shuang-Quan Zhang","doi":"10.1088/1674-1137/ad62dd","DOIUrl":"https://doi.org/10.1088/1674-1137/ad62dd","url":null,"abstract":"The inner fission barriers of the even-even uranium isotopes from the proton to the neutron drip line are examined using the deformed relativistic Hartree-Bogoliubov theory in continuum. A periodic-like evolution for the ground state shapes is shown with respect to the neutron number, <italic toggle=\"yes\">i.e.</italic>, spherical shapes at shell closures <inline-formula>\u0000<tex-math><?CDATA $ N= $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_104105_M1.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>126, 184, 258, and prolate dominated shapes between them. Analogous to the shape evolution, the inner fission barriers also exhibit a periodic-like behavior: peaks at the shell closures and valleys in the mid-shells. The triaxial effect on the inner fission barrier is evaluated using triaxial relativistic mean field calculations combined with a simple BCS method for pairing. When the triaxial correction is included, the inner barrier heights show good consistency with available empirical data. Additionally, the evolution from the proton to the neutron drip line aligns with results from the multi-dimensionally constrained relativistic mean field theory. A flat valley in the fission barrier height is predicted around the neutron-rich nucleus <inline-formula>\u0000<tex-math><?CDATA $ ^{318} $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_104105_M2.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>U which may play a role of fission recycling in astrophysical <italic toggle=\"yes\">r</italic>-process nucleosynthesis.","PeriodicalId":10250,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":3.6,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142175509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"CP violation of baryon decays with N π rescatterings* * Supported in part by the Natural Science Foundation of China (12335003), and the Fundamental Research Funds for the Central Universities (lzujbky-2024-oy02, lzujbky-2023-it12)","authors":"Jian-Peng Wang, Fu-Sheng Yu","doi":"10.1088/1674-1137/ad75f4","DOIUrl":"https://doi.org/10.1088/1674-1137/ad75f4","url":null,"abstract":"There is a long-standing puzzle that the CP violation (CPV) in the baryon systems has never been well established in experiments, while the CPV of mesons have been observed by decades. In this paper, we propose that the CPV of baryon decays can be generated with the rescatterings of a nucleon and a pion into some final states, i.e. &lt;inline-formula&gt;\u0000&lt;tex-math&gt;&lt;?CDATA $Npito Npi$?&gt;&lt;/tex-math&gt;\u0000&lt;inline-graphic xlink:href=\"cpc_48_10_101002_M1.jpg\" xlink:type=\"simple\"&gt;&lt;/inline-graphic&gt;\u0000&lt;/inline-formula&gt; or &lt;inline-formula&gt;\u0000&lt;tex-math&gt;&lt;?CDATA $Npipi$?&gt;&lt;/tex-math&gt;\u0000&lt;inline-graphic xlink:href=\"cpc_48_10_101002_M2.jpg\" xlink:type=\"simple\"&gt;&lt;/inline-graphic&gt;\u0000&lt;/inline-formula&gt;. Benefited by the fruitful data of &lt;inline-formula&gt;\u0000&lt;tex-math&gt;&lt;?CDATA $Npi$?&gt;&lt;/tex-math&gt;\u0000&lt;inline-graphic xlink:href=\"cpc_48_10_101002_M3.jpg\" xlink:type=\"simple\"&gt;&lt;/inline-graphic&gt;\u0000&lt;/inline-formula&gt; scatterings, we can model-independently analyse the strong phases of &lt;inline-formula&gt;\u0000&lt;tex-math&gt;&lt;?CDATA $b$?&gt;&lt;/tex-math&gt;\u0000&lt;inline-graphic xlink:href=\"cpc_48_10_101002_M4.jpg\" xlink:type=\"simple\"&gt;&lt;/inline-graphic&gt;\u0000&lt;/inline-formula&gt;-baryon decays using the partial wave amplitudes of &lt;inline-formula&gt;\u0000&lt;tex-math&gt;&lt;?CDATA $Npi$?&gt;&lt;/tex-math&gt;\u0000&lt;inline-graphic xlink:href=\"cpc_48_10_101002_M5.jpg\" xlink:type=\"simple\"&gt;&lt;/inline-graphic&gt;\u0000&lt;/inline-formula&gt; scatterings. Avoiding the most difficult problem of non-perturbative dynamics, it makes a great advantage to predict the CPV of baryon decays with a relatively reliable understanding of the decay dynamics. We study the processes of &lt;inline-formula&gt;\u0000&lt;tex-math&gt;&lt;?CDATA $Lambda_b^0to (ppi^+pi^-)h^-$?&gt;&lt;/tex-math&gt;\u0000&lt;inline-graphic xlink:href=\"cpc_48_10_101002_M6.jpg\" xlink:type=\"simple\"&gt;&lt;/inline-graphic&gt;\u0000&lt;/inline-formula&gt; and &lt;inline-formula&gt;\u0000&lt;tex-math&gt;&lt;?CDATA $(ppi^0)h^-$?&gt;&lt;/tex-math&gt;\u0000&lt;inline-graphic xlink:href=\"cpc_48_10_101002_M7.jpg\" xlink:type=\"simple\"&gt;&lt;/inline-graphic&gt;\u0000&lt;/inline-formula&gt; with &lt;inline-formula&gt;\u0000&lt;tex-math&gt;&lt;?CDATA $h=pi$?&gt;&lt;/tex-math&gt;\u0000&lt;inline-graphic xlink:href=\"cpc_48_10_101002_M8.jpg\" xlink:type=\"simple\"&gt;&lt;/inline-graphic&gt;\u0000&lt;/inline-formula&gt; or &lt;inline-formula&gt;\u0000&lt;tex-math&gt;&lt;?CDATA $K$?&gt;&lt;/tex-math&gt;\u0000&lt;inline-graphic xlink:href=\"cpc_48_10_101002_M9.jpg\" xlink:type=\"simple\"&gt;&lt;/inline-graphic&gt;\u0000&lt;/inline-formula&gt;. It is found that the global CPV of the above processes in the invariant mass regions of &lt;inline-formula&gt;\u0000&lt;tex-math&gt;&lt;?CDATA $Npi$?&gt;&lt;/tex-math&gt;\u0000&lt;inline-graphic xlink:href=\"cpc_48_10_101002_M10.jpg\" xlink:type=\"simple\"&gt;&lt;/inline-graphic&gt;\u0000&lt;/inline-formula&gt; scatterings are at the order of several percent. More importantly, the local CPV in some regions of the Dalitz plots can reach the order of 10%, or be even larger. Considering the predicted results and the experimental data samples, we strong suggest to measure the CPV of &lt;inline-formula&gt;\u0000&lt;tex-math&gt;&lt;?CDATA $Lambda_b^0to (ppi^+pi^-)K^-$?&gt;&lt;/tex-math&gt;\u0000&lt;inline-graphic xlink:href=\"cpc_48_10_101002_M11.jpg\" xlink:type=\"simple\"&gt;&lt;/inline-graphic&gt;\u0000&lt;/inline-formula&gt;, which has a large possibility to achieve the f","PeriodicalId":10250,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":3.6,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142175494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Generating Baikal-GVD high energy cascade-like neutrino events with a GEANT4-based simulation toolkit* * Supported by the Department of Science and Technology of Sichuan Province, China (2023YFSY0014), the Innovation Fund (E25156U110 of IHEP), GHFUND A (202302019600), and the framework of the State project \"Science\" by the Ministry of Science and Higher Education of the Russian Federation (075-15-2024-541)","authors":"Zike Wang, A.D. Avrorin, Zhen Cao, Mingjun Chen, Peiyuan Chu, Zh.-A.M. Dzhilkibaev, Bo Gao, Tianqi Huang, Jiali Liu, Ying Qi, Xiaohao You, D.N. Zaborov","doi":"10.1088/1674-1137/ad5bd4","DOIUrl":"https://doi.org/10.1088/1674-1137/ad5bd4","url":null,"abstract":"Using the GEANT4 and Cosmic Ray Monte Carlo (CRMC) software packages, we developed a new simulation toolkit for astrophysical neutrino telescopes. By configuring the Baikal-GVD detector and comparing the vertex position and direction of incident particles, as well as the channel-by-channel signals, to the events detected by Baikal-GVD, we successfully generated 13 high-energy cascade neutrino events with the toolkit. Our analysis revealed a systematic offset between the reconstructed shower position and the true interaction position, with a distance close to the scale of the shower maximum of −0.54±1.29 m. We achieved a good linear relationship between the photoelectron number of neutrino events obtained by simulation and the real data measured by Baikal-GVD. The simulation toolkit could serve as a reliable basis for studying the performance of astrophysical neutrino telescopes.","PeriodicalId":10250,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":3.6,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142175518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Probing inelastic signatures of dark matter detection via polarized nucleus* * Supported by the National Natural Science Foundation of China (12275232, 12005180), the Natural Science Foundation of Shandong Province, China (ZR2020QA083) and the Project of Higher Educational Science and Technology Program of Shandong Province, China (2022KJ271)","authors":"Zai Yun, Junwei Sun, Bin Zhu, Xuewen Liu","doi":"10.1088/1674-1137/ad6416","DOIUrl":"https://doi.org/10.1088/1674-1137/ad6416","url":null,"abstract":"We investigate the inelastic signatures of dark matter-nucleus interactions, explicitly focusing on the ramifications of polarization, dark matter splitting, and the Migdal effect. Direct detection experiments, crucial for testing the existence of dark matter, encounter formidable obstacles, such as indomitable neutrino backgrounds and elusive determination of dark matter spin. To overcome these challenges, we explore the potential of polarized-target dark matter scattering, examining the impact of nonvanishing mass splitting, and the role of the Migdal effect in detecting dark matter. Our analysis demonstrates the valuable utility of the polarized triple-differential event rate as an effective tool for examining inelastic dark matter. It enables us to investigate angular and energy dependencies, providing valuable insights into the scattering process.","PeriodicalId":10250,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":3.6,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142175496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of family non-universal Z ′ model in angular observables of decays* * Supported by the Higher Education Commission of Pakistan through (NRPU/20-15142)","authors":"Nimra Farooq, Marwah Zaki, M. Ali Paracha, Faisal Munir Bhutta","doi":"10.1088/1674-1137/ad5e65","DOIUrl":"https://doi.org/10.1088/1674-1137/ad5e65","url":null,"abstract":"We present the angular distribution of the four-fold <inline-formula>\u0000<tex-math><?CDATA $ Btorho (topipi)mu^{+}mu^{-} $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_103107_M1.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> and <inline-formula>\u0000<tex-math><?CDATA $ Bto a_{1}(torho_{parallel, perp}pi)mu^{+}mu^{-} $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_103107_M2.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> decays in the Standard Model and family non-universal <inline-formula>\u0000<tex-math><?CDATA $ Z^{prime} $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_103107_M3.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> model. At the quark level, these decays are governed by the <inline-formula>\u0000<tex-math><?CDATA $ bto dmu^{+}mu^{-} $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_103107_M4.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> transition. Along with different angular observables, we provide predictions of differential branching ratios, forward-backward asymmetry, and longitudinal polarization fractions of <inline-formula>\u0000<tex-math><?CDATA $ rho $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_103107_M5.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> and <inline-formula>\u0000<tex-math><?CDATA $ a_{1} $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_103107_M6.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> mesons. Our analysis shows that the signatures of the family non-universal <inline-formula>\u0000<tex-math><?CDATA $ Z^{prime} $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_103107_M7.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> model are more distinct in the observables associated with the <inline-formula>\u0000<tex-math><?CDATA $ Btorho(topipi)mu^{+}mu^{-} $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_103107_M8.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> decay than in those associated with the <inline-formula>\u0000<tex-math><?CDATA $ Bto a_{1}(torho_{parallel, perp}pi)mu^{+}mu^{-} $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_103107_M9.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> decay. Future measurements of the predicted angular observables, both at current and future high energy colliders, will provide useful complementary data required to clarify the structure of the family non-universal <inline-formula>\u0000<tex-math><?CDATA $ Z^{prime} $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_103107_M10.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> model in <inline-formula>\u0000<tex-math><?CDATA $ |Delta b| $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_103107_M11.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>=<inline-formula>\u0000<tex-math><?CDATA $ |Delta d|=1 $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_103107_M12.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> processes.","PeriodicalId":10250,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":3.6,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142175512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}