Pub Date : 2024-10-01DOI: 10.1088/1674-1137/ad595a
Chang-Le Liu, Wen-Xuan Zhang, Duo-Jie Jia
In this study, we analyzed masses and decays of triply-heavy pentaquarks 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.
{"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":"中国物理C","volume":"105 1","pages":""},"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}
Pub Date : 2024-10-01DOI: 10.1088/1674-1137/ad62d8
Kai Ma, Tong Li
The decay of Higgs boson into two spin-1/2 particles provides an ideal system to reveal quantum entanglement and Bell-nonlocality. Future 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 at Circular Electron Positron Collider (CEPC). Two realistic methods of testing Bell inequality are investigated, i.e., 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 Z boson in the production of . Necessary reconstruction approaches are described to measure quantum entanglement between and . Finally, we show the sensitivity of CEPC to Bell inequality violation for the two methods.
希格斯玻色子衰变为两个自旋-1/2粒子为揭示量子纠缠和贝尔非局域性提供了一个理想的系统。未来的对撞机可以提高希格斯玻色子衰变产生的头轻子对自旋相关性的测量精度。我们通过环形电子正负电子对撞机（CEPC）展示了贝尔不等式的可测试性。我们研究了检验贝尔不等式的两种现实方法，即托恩奎斯特方法和克劳瑟-霍姆-希莫尼-霍尔特（CHSH）不等式。在模拟中，我们考虑了 CEPC 的探测器效应，包括 Z 玻色子产生的轨道和喷流的不确定性。 描述了测量和之间量子纠缠的必要重建方法。最后，我们展示了两种方法的 CEPC 对违反贝尔不等式的敏感性。
{"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":"中国物理C","volume":"18 1","pages":""},"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}
In this study, the properties of heavy quarkonia <italic toggle="yes">X</italic> are examined by treating them as bound states of <italic toggle="yes">Q</italic> and <inline-formula> <tex-math><?CDATA $ bar{Q} $?></tex-math> <inline-graphic xlink:href="cpc_48_10_103108_M1.jpg" xlink:type="simple"></inline-graphic> </inline-formula> at the leading-order level within the non-relativistic quantum chromodynamics (NRQCD) framework, where <italic toggle="yes">Q</italic> represents either a charm or bottom quark. The branching ratios for the radiative leptonic decays <inline-formula> <tex-math><?CDATA $ Xrightarrow gamma l^{+} l^{-} $?></tex-math> <inline-graphic xlink:href="cpc_48_10_103108_M2.jpg" xlink:type="simple"></inline-graphic> </inline-formula> are revisited, and the angular and energy/momentum distributions of the final state particles are analyzed in the rest frame of <italic toggle="yes">X</italic>. Furthermore, we apply Lorentz transformations from the rest frame of <italic toggle="yes">X</italic> to the center-of-mass frame of <inline-formula> <tex-math><?CDATA $ l^+ l^- $?></tex-math> <inline-graphic xlink:href="cpc_48_10_103108_M3.jpg" xlink:type="simple"></inline-graphic> </inline-formula> to establish the connection between the widths <inline-formula> <tex-math><?CDATA $ {Gamma_{X rightarrow gamma l^{+} l^{-}}} $?></tex-math> <inline-graphic xlink:href="cpc_48_10_103108_M4.jpg" xlink:type="simple"></inline-graphic> </inline-formula> and <inline-formula> <tex-math><?CDATA $ {Gamma_{X rightarrow l^{+} l^{-}}} $?></tex-math> <inline-graphic xlink:href="cpc_48_10_103108_M5.jpg" xlink:type="simple"></inline-graphic> </inline-formula>. The comparison of the connection to those documented in literature (divided by <inline-formula> <tex-math><?CDATA $ 2pi $?></tex-math> <inline-graphic xlink:href="cpc_48_10_103108_M6.jpg" xlink:type="simple"></inline-graphic> </inline-formula>) for various <italic toggle="yes">X</italic> states, such as <inline-formula> <tex-math><?CDATA $ J/Psi $?></tex-math> <inline-graphic xlink:href="cpc_48_10_103108_M7.jpg" xlink:type="simple"></inline-graphic> </inline-formula>, <inline-formula> <tex-math><?CDATA $ Psi(2S) $?></tex-math> <inline-graphic xlink:href="cpc_48_10_103108_M8.jpg" xlink:type="simple"></inline-graphic> </inline-formula>, <inline-formula> <tex-math><?CDATA $ Upsilon(1S) $?></tex-math> <inline-graphic xlink:href="cpc_48_10_103108_M9.jpg" xlink:type="simple"></inline-graphic> </inline-formula>, and <inline-formula> <tex-math><?CDATA $ Upsilon(2S) $?></tex-math> <inline-graphic xlink:href="cpc_48_10_103108_M10.jpg" xlink:type="simple"></inline-graphic> </inline-formula>, shows relative differences typically around or below 10%, comparable to the next-to-leading order corrections of <inline-formula> <tex-math><?CDATA $ O(alpha) $?></tex-math> <inline-graphic xlink:href="cpc_48_10_103108_M11.jpg" xlink:type="simple"></inline-graphic> </inline-formula> and <inline-formula> <tex-math><?CDATA $ O(v^4) $?
在本研究中，通过把重夸克态 X 视为 Q 的束缚态，并在非相对论量子色动力学（NRQCD）框架内的先导阶水平（其中 Q 代表粲夸克或底夸克），研究了重夸克态 X 的性质。我们重新研究了辐射轻子衰变的分支比，并在 X 的静止帧中分析了终态粒子的角分布和能量/动量分布。与文献中对各种 X 状态（如 、 、 和 ）的连接（除以 ）进行比较，发现相对差异通常在 10%左右或以下，与 和 的次先导阶修正相当。 然而，我们观察到和 之间的比率存在显著差异，我们的预测比文献中的预测大四倍。这项研究得出的结果对描述量子电动力学辐射过程具有实际意义，并有助于研究与重夸克衰变相关的 QCD 过程和寻找新物理。
{"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 <italic toggle=\"yes\">X</italic> are examined by treating them as bound states of <italic toggle=\"yes\">Q</italic> and <inline-formula>\u0000<tex-math><?CDATA $ bar{Q} $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_103108_M1.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> at the leading-order level within the non-relativistic quantum chromodynamics (NRQCD) framework, where <italic toggle=\"yes\">Q</italic> represents either a charm or bottom quark. The branching ratios for the radiative leptonic decays <inline-formula>\u0000<tex-math><?CDATA $ Xrightarrow gamma l^{+} l^{-} $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_103108_M2.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> are revisited, and the angular and energy/momentum distributions of the final state particles are analyzed in the rest frame of <italic toggle=\"yes\">X</italic>. Furthermore, we apply Lorentz transformations from the rest frame of <italic toggle=\"yes\">X</italic> to the center-of-mass frame of <inline-formula>\u0000<tex-math><?CDATA $ l^+ l^- $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_103108_M3.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> to establish the connection between the widths <inline-formula>\u0000<tex-math><?CDATA $ {Gamma_{X rightarrow gamma l^{+} l^{-}}} $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_103108_M4.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> and <inline-formula>\u0000<tex-math><?CDATA $ {Gamma_{X rightarrow l^{+} l^{-}}} $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_103108_M5.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>. The comparison of the connection to those documented in literature (divided by <inline-formula>\u0000<tex-math><?CDATA $ 2pi $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_103108_M6.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>) for various <italic toggle=\"yes\">X</italic> states, such as <inline-formula>\u0000<tex-math><?CDATA $ J/Psi $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_103108_M7.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>, <inline-formula>\u0000<tex-math><?CDATA $ Psi(2S) $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_103108_M8.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>, <inline-formula>\u0000<tex-math><?CDATA $ Upsilon(1S) $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_103108_M9.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>, and <inline-formula>\u0000<tex-math><?CDATA $ Upsilon(2S) $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_103108_M10.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>, shows relative differences typically around or below 10%, comparable to the next-to-leading order corrections of <inline-formula>\u0000<tex-math><?CDATA $ O(alpha) $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_103108_M11.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> and <inline-formula>\u0000<tex-math><?CDATA $ O(v^4) $?","PeriodicalId":10250,"journal":{"name":"中国物理C","volume":"6 1","pages":""},"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}
Pub Date : 2024-10-01DOI: 10.1088/1674-1137/ad5ae5
Zhi-Gang Wang
In this study, we chose the diquark-antidiquark type four-quark currents with an explicit P-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 . We also obtained the lowest vector tetraquark masses and made possible assignments of the existing states. There indeed exists a hidden-charm tetraquark state with at an energy of approximately 4.75 GeV as the first radial excitation that accounts for the BESIII data.
{"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":"中国物理C","volume":"74 1","pages":""},"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}
Pub Date : 2024-10-01DOI: 10.1088/1674-1137/ad5a71
Zhi-Gang Wang
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 Bc 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.
{"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<sub>\u0000<italic toggle=\"yes\">c</italic>\u0000</sub> 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":"中国物理C","volume":"33 1","pages":""},"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}
Pub Date : 2024-10-01DOI: 10.1088/1674-1137/ad75f4
Jian-Peng Wang, Fu-Sheng Yu
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. <inline-formula> <tex-math><?CDATA $Npito Npi$?></tex-math> <inline-graphic xlink:href="cpc_48_10_101002_M1.jpg" xlink:type="simple"></inline-graphic> </inline-formula> or <inline-formula> <tex-math><?CDATA $Npipi$?></tex-math> <inline-graphic xlink:href="cpc_48_10_101002_M2.jpg" xlink:type="simple"></inline-graphic> </inline-formula>. Benefited by the fruitful data of <inline-formula> <tex-math><?CDATA $Npi$?></tex-math> <inline-graphic xlink:href="cpc_48_10_101002_M3.jpg" xlink:type="simple"></inline-graphic> </inline-formula> scatterings, we can model-independently analyse the strong phases of <inline-formula> <tex-math><?CDATA $b$?></tex-math> <inline-graphic xlink:href="cpc_48_10_101002_M4.jpg" xlink:type="simple"></inline-graphic> </inline-formula>-baryon decays using the partial wave amplitudes of <inline-formula> <tex-math><?CDATA $Npi$?></tex-math> <inline-graphic xlink:href="cpc_48_10_101002_M5.jpg" xlink:type="simple"></inline-graphic> </inline-formula> 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 <inline-formula> <tex-math><?CDATA $Lambda_b^0to (ppi^+pi^-)h^-$?></tex-math> <inline-graphic xlink:href="cpc_48_10_101002_M6.jpg" xlink:type="simple"></inline-graphic> </inline-formula> and <inline-formula> <tex-math><?CDATA $(ppi^0)h^-$?></tex-math> <inline-graphic xlink:href="cpc_48_10_101002_M7.jpg" xlink:type="simple"></inline-graphic> </inline-formula> with <inline-formula> <tex-math><?CDATA $h=pi$?></tex-math> <inline-graphic xlink:href="cpc_48_10_101002_M8.jpg" xlink:type="simple"></inline-graphic> </inline-formula> or <inline-formula> <tex-math><?CDATA $K$?></tex-math> <inline-graphic xlink:href="cpc_48_10_101002_M9.jpg" xlink:type="simple"></inline-graphic> </inline-formula>. It is found that the global CPV of the above processes in the invariant mass regions of <inline-formula> <tex-math><?CDATA $Npi$?></tex-math> <inline-graphic xlink:href="cpc_48_10_101002_M10.jpg" xlink:type="simple"></inline-graphic> </inline-formula> 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 <inline-formula> <tex-math><?CDATA $Lambda_b^0to (ppi^+pi^-)K^-$?></tex-math> <inline-graphic xlink:href="cpc_48_10_101002_M11.jpg" xlink:type="simple"></inline-graphic> </inline-formula>, which has a large possibility to achieve the f
{"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. <inline-formula>\u0000<tex-math><?CDATA $Npito Npi$?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_101002_M1.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> or <inline-formula>\u0000<tex-math><?CDATA $Npipi$?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_101002_M2.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>. Benefited by the fruitful data of <inline-formula>\u0000<tex-math><?CDATA $Npi$?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_101002_M3.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> scatterings, we can model-independently analyse the strong phases of <inline-formula>\u0000<tex-math><?CDATA $b$?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_101002_M4.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>-baryon decays using the partial wave amplitudes of <inline-formula>\u0000<tex-math><?CDATA $Npi$?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_101002_M5.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> 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 <inline-formula>\u0000<tex-math><?CDATA $Lambda_b^0to (ppi^+pi^-)h^-$?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_101002_M6.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> and <inline-formula>\u0000<tex-math><?CDATA $(ppi^0)h^-$?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_101002_M7.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> with <inline-formula>\u0000<tex-math><?CDATA $h=pi$?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_101002_M8.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> or <inline-formula>\u0000<tex-math><?CDATA $K$?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_101002_M9.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>. It is found that the global CPV of the above processes in the invariant mass regions of <inline-formula>\u0000<tex-math><?CDATA $Npi$?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_101002_M10.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> 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 <inline-formula>\u0000<tex-math><?CDATA $Lambda_b^0to (ppi^+pi^-)K^-$?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_10_101002_M11.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>, which has a large possibility to achieve the f","PeriodicalId":10250,"journal":{"name":"中国物理C","volume":"63 1","pages":""},"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}
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, i.e., spherical shapes at shell closures 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 U which may play a role of fission recycling in astrophysical r-process nucleosynthesis.
利用连续体变形相对论哈特里-波哥留布夫理论，研究了偶偶态铀同位素从质子到中子滴落线的内部裂变势垒。基态形状随中子数呈周期性演化，即在壳闭合 126、184 和 258 时呈球形，在这三者之间呈长方形为主。与形状演变类似，内部裂变势垒也表现出周期性的行为：在壳闭合处出现峰值，在壳中间出现谷值。利用三轴相对论均场计算结合简单的 BCS 配对方法，对内部裂变势垒的三轴效应进行了评估。当包括三轴修正时，内部势垒高度显示出与现有经验数据的良好一致性。此外，从质子滴落线到中子滴落线的演变与多维约束相对论均场理论的结果一致。预测在富中子核 U 周围的裂变势垒高度会出现一个平谷，这可能在天体物理 r 过程核合成中起到裂变再循环的作用。
{"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":"中国物理C","volume":"9 1","pages":""},"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}
Pub Date : 2024-10-01DOI: 10.1088/1674-1137/ad6416
Zai Yun, Junwei Sun, Bin Zhu, Xuewen Liu
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.
{"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":"中国物理C","volume":"105 1","pages":""},"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}
Pub Date : 2024-10-01DOI: 10.1088/1674-1137/ad5e65
Nimra Farooq, Marwah Zaki, M. Ali Paracha, Faisal Munir Bhutta
We present the angular distribution of the four-fold and decays in the Standard Model and family non-universal model. At the quark level, these decays are governed by the transition. Along with different angular observables, we provide predictions of differential branching ratios, forward-backward asymmetry, and longitudinal polarization fractions of and mesons. Our analysis shows that the signatures of the family non-universal model are more distinct in the observables associated with the decay than in those associated with the 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 model in = processes.
{"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":"中国物理C","volume":"41 1","pages":""},"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}
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.
{"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":"中国物理C","volume":"11 1","pages":""},"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}
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