Pub Date : 2024-05-31DOI: 10.1088/1674-1137/ad361a
R.S. Mukhin, A.V. Isaev, A.V. Andreev, M.L. Chelnokov, V.I. Chepigin, H.M. Devaraja, I.N. Izosimov, A.A. Kuznetsova, O.N. Malyshev, A.G. Popeko, Yu.A. Popov, A. Rahmatinejad, B. Sailaubekov, T.M. Shneidman, E.A. Sokol, A.I. Svirikhin, M.S. Tezekbayeva, M.A. Bychkov, A.V. Yeremin, O. Dorvaux, B. Gall, K. Kessaci, K. Hauschild and A. Lopez-Martens
The complete-fusion reaction 204Pb(48Ca,2n)250No was used to study two activities of 250No with distinct half-lives. A total of 1357 events were observed in the SFiNx neutron detection system. The average number of neutrons emitted per spontaneous fission of 250No was determined to be . The unusually symmetrical shape of the prompt neutron multiplicity distribution was restored and presented for the first time. Statistical tests were performed to compare the prompt neutron multiplicity distributions associated with the ground state and K-isomer state decays.
{"title":"Prompt neutron emission in 250No spontaneous fission associated with ground and isomeric state decays","authors":"R.S. Mukhin, A.V. Isaev, A.V. Andreev, M.L. Chelnokov, V.I. Chepigin, H.M. Devaraja, I.N. Izosimov, A.A. Kuznetsova, O.N. Malyshev, A.G. Popeko, Yu.A. Popov, A. Rahmatinejad, B. Sailaubekov, T.M. Shneidman, E.A. Sokol, A.I. Svirikhin, M.S. Tezekbayeva, M.A. Bychkov, A.V. Yeremin, O. Dorvaux, B. Gall, K. Kessaci, K. Hauschild and A. Lopez-Martens","doi":"10.1088/1674-1137/ad361a","DOIUrl":"https://doi.org/10.1088/1674-1137/ad361a","url":null,"abstract":"The complete-fusion reaction 204Pb(48Ca,2n)250No was used to study two activities of 250No with distinct half-lives. A total of 1357 events were observed in the SFiNx neutron detection system. The average number of neutrons emitted per spontaneous fission of 250No was determined to be . The unusually symmetrical shape of the prompt neutron multiplicity distribution was restored and presented for the first time. Statistical tests were performed to compare the prompt neutron multiplicity distributions associated with the ground state and K-isomer state decays.","PeriodicalId":10250,"journal":{"name":"中国物理C","volume":"56 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2024-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141194166","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 paper, we investigate the charmed meson rare decay process using an approach based on QCD sum rules. First, the pion twist-2, 3 distribution amplitude (DA) moments and are calculated up to the tenth and fourth orders, respectively, in the QCD sum rules according to the background field theory. After constructing the light-cone harmonic oscillator model for the pion twist-2, 3 DAs, we obtain their behaviors by matching the calculated ξ-moments. Then, the transition form factors (TFFs) are calculated using an approach based on QCD light-cone sum rules. The vector form factor at the large recoil region is . Using the rapidly converging simplified series expansion of , we present the TFFs and corresponding angular coefficients in the whole squared momentum transfer physical region. Based on non-standard neutrino interactions, the decay can be related to the decay indirectly. Thus, we first describe the semileptonic decay process , differential decay widths, and branching fraction with . The differential/total predictions for forward-backward asymmetry, -differential flat terms, and lepton polarization asymmetry are also reported. The prediction for the branching fraction is .
{"title":"decay process within the QCDSR approach*","authors":"Yu Chen, 宇 陈, Hai-Bing Fu, 海冰 付, Tao Zhong, 涛 钟, Sheng-Bo Wu, 胜波 吴, Dong Huang and 冬 黄","doi":"10.1088/1674-1137/ad30f0","DOIUrl":"https://doi.org/10.1088/1674-1137/ad30f0","url":null,"abstract":"In this paper, we investigate the charmed meson rare decay process using an approach based on QCD sum rules. First, the pion twist-2, 3 distribution amplitude (DA) moments and are calculated up to the tenth and fourth orders, respectively, in the QCD sum rules according to the background field theory. After constructing the light-cone harmonic oscillator model for the pion twist-2, 3 DAs, we obtain their behaviors by matching the calculated ξ-moments. Then, the transition form factors (TFFs) are calculated using an approach based on QCD light-cone sum rules. The vector form factor at the large recoil region is . Using the rapidly converging simplified series expansion of , we present the TFFs and corresponding angular coefficients in the whole squared momentum transfer physical region. Based on non-standard neutrino interactions, the decay can be related to the decay indirectly. Thus, we first describe the semileptonic decay process , differential decay widths, and branching fraction with . The differential/total predictions for forward-backward asymmetry, -differential flat terms, and lepton polarization asymmetry are also reported. The prediction for the branching fraction is .","PeriodicalId":10250,"journal":{"name":"中国物理C","volume":"12 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2024-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140812206","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 : 2024-05-31DOI: 10.1088/1674-1137/ad32c0
Meng-Yao Zhang, 梦瑶 张, Hao Chen, 浩 陈, Hassan Hassanabad, Zheng-Wen Long, 正文 隆, Hui Yang and 辉 杨
By considering the concept of a unified single fluid model, referred to as modified Chaplygin gas (MCG), which amalgamates dark energy and dark matter, we explore the thermodynamic characteristics of charged anti-de Sitter (AdS) black holes existing in an unconventional fluid accompanied by MCG. To accomplish this objective, we derive the equations of state by regarding the charge as a thermodynamic variable. The effects of MCG parameters on the critical thermodynamic quantities ( , , ) are examined, followed by a detailed analysis of the diagram. To provide a clearer explanation of the phase transition, we present an analysis of the Gibbs free energy. It is important to note that if the Hawking temperature exceeds the critical temperature, a distinct pattern is observed known as swallowtail behavior. This indicates that the system undergoes a first-order phase transition from a smaller black hole to a larger one. The critical exponent of the system is found to be in complete agreement with that of the van der Waals fluid system. Furthermore, we investigate the impact of MCG parameters and black hole charge on Joule-Thomson (J-T) expansion in the extended phase space. The J-T coefficient is examined to pinpoint the exact region experiencing cooling or heating, and the observation reveals that the presence of negative heat capacity results in the occurrence of a cooling process. The impact of MCG on the inversion curve of charged black holes exhibits a striking resemblance to that observed in most multi-dimensional black hole systems. In addition, it is worth noting that certain parameters exert a significant influence on the ratio . For specific values of the MCG parameters, the ratio is consistent with the charged AdS black hole. The parameters γ and β have a non-negligible effect on the isenthalpic curve.
通过考虑将暗能量和暗物质融合在一起的统一单一流体模型（称为修正查普利金气体（MCG））的概念，我们探索了存在于伴随 MCG 的非常规流体中的带电反德西特（AdS）黑洞的热力学特性。为了实现这一目标，我们将电荷视为热力学变量，推导出了状态方程。我们研究了 MCG 参数对临界热力学量（ 、 、 ）的影响，随后对图进行了详细分析。为了更清晰地解释相变，我们对吉布斯自由能进行了分析。值得注意的是，如果霍金温度超过临界温度，就会出现一种被称为 "燕尾行为 "的独特模式。这表明系统经历了从较小黑洞到较大黑洞的一阶相变。我们发现该系统的临界指数与范德华流体系统的临界指数完全一致。此外，我们还研究了 MCG 参数和黑洞电荷对扩展相空间中焦耳-汤姆森（J-T）膨胀的影响。通过研究 J-T 系数，我们可以精确定位发生冷却或加热的区域，观察结果表明，负热容量的存在会导致冷却过程的发生。MCG 对带电黑洞反转曲线的影响与在大多数多维黑洞系统中观察到的情况极为相似。此外，值得注意的是，某些参数对反演曲线的比值有显著影响。对于 MCG 参数的特定值，该比值与带电 AdS 黑洞一致。参数 γ 和 β 对等时曲线有不可忽略的影响。
{"title":"Critical behavior and Joule-Thomson expansion of charged AdS black holes surrounded by exotic fluid with modified Chaplygin equation of state*","authors":"Meng-Yao Zhang, 梦瑶 张, Hao Chen, 浩 陈, Hassan Hassanabad, Zheng-Wen Long, 正文 隆, Hui Yang and 辉 杨","doi":"10.1088/1674-1137/ad32c0","DOIUrl":"https://doi.org/10.1088/1674-1137/ad32c0","url":null,"abstract":"By considering the concept of a unified single fluid model, referred to as modified Chaplygin gas (MCG), which amalgamates dark energy and dark matter, we explore the thermodynamic characteristics of charged anti-de Sitter (AdS) black holes existing in an unconventional fluid accompanied by MCG. To accomplish this objective, we derive the equations of state by regarding the charge as a thermodynamic variable. The effects of MCG parameters on the critical thermodynamic quantities ( , , ) are examined, followed by a detailed analysis of the diagram. To provide a clearer explanation of the phase transition, we present an analysis of the Gibbs free energy. It is important to note that if the Hawking temperature exceeds the critical temperature, a distinct pattern is observed known as swallowtail behavior. This indicates that the system undergoes a first-order phase transition from a smaller black hole to a larger one. The critical exponent of the system is found to be in complete agreement with that of the van der Waals fluid system. Furthermore, we investigate the impact of MCG parameters and black hole charge on Joule-Thomson (J-T) expansion in the extended phase space. The J-T coefficient is examined to pinpoint the exact region experiencing cooling or heating, and the observation reveals that the presence of negative heat capacity results in the occurrence of a cooling process. The impact of MCG on the inversion curve of charged black holes exhibits a striking resemblance to that observed in most multi-dimensional black hole systems. In addition, it is worth noting that certain parameters exert a significant influence on the ratio . For specific values of the MCG parameters, the ratio is consistent with the charged AdS black hole. The parameters γ and β have a non-negligible effect on the isenthalpic curve.","PeriodicalId":10250,"journal":{"name":"中国物理C","volume":"131 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2024-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140812223","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 : 2024-05-01DOI: 10.1088/1674-1137/ad2a62
Hai-Xiang Chen, Sheng-Kai Cui, Ning-Yu Zhu, Zhao-Yang Zhang, Huai-Cong Hu
We investigate the two loop electroweak corrections to B meson rare decays and in the minimal supersymmetry standard model (MSSM) extension with two triplets and one singlet (TNMSSM). The new particle contents and interactions in the TNMSSM can affect the theoretical predictions of the branching ratios and , and the corrections from two loop diagrams to the process can reach around . Considering the latest experimental measurements, the numerical results of and in the TNMSSM are presented and analyzed. The findings indicate that the results in the TNMSSM can fit the updated experimental data well, and the new parameters , clearly affect the theoretical predictions of and .
{"title":"B meson rare decays in the TNMSSM* * Supported by the National Natural Science Foundation of China (12075074, 12235008, 11535002, 11705045), the Natural Science Foundation for Distinguished Young Scholars of Hebei Province, China (A2022201017), the Natural Science Foundation of Guangxi Autonomous Region (2022GXNSFDA035068), and the Youth Top-Notch Talent Support Program of the Hebei Province, China.","authors":"Hai-Xiang Chen, Sheng-Kai Cui, Ning-Yu Zhu, Zhao-Yang Zhang, Huai-Cong Hu","doi":"10.1088/1674-1137/ad2a62","DOIUrl":"https://doi.org/10.1088/1674-1137/ad2a62","url":null,"abstract":"We investigate the two loop electroweak corrections to <italic toggle=\"yes\">B</italic> meson rare decays <inline-formula>\u0000<tex-math><?CDATA $ bar Brightarrow X_sgamma $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_053104_M1.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> and <inline-formula>\u0000<tex-math><?CDATA $ B_s^0rightarrow mu^+mu^- $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_053104_M2.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> in the minimal supersymmetry standard model (MSSM) extension with two triplets and one singlet (TNMSSM). The new particle contents and interactions in the TNMSSM can affect the theoretical predictions of the branching ratios <inline-formula>\u0000<tex-math><?CDATA $ {rm{Br}}(bar Brightarrow X_sgamma) $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_053104_M3.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> and <inline-formula>\u0000<tex-math><?CDATA $ {rm{Br}}(B_s^0rightarrow mu^+mu^-) $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_053104_M4.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>, and the corrections from two loop diagrams to the process <inline-formula>\u0000<tex-math><?CDATA $ bar Brightarrow X_sgamma $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_053104_M5.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> can reach around <inline-formula>\u0000<tex-math><?CDATA $ 4% $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_053104_M6.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>. Considering the latest experimental measurements, the numerical results of <inline-formula>\u0000<tex-math><?CDATA $ {rm{Br}}(bar Brightarrow X_sgamma) $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_053104_M7.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> and <inline-formula>\u0000<tex-math><?CDATA $ {rm{Br}}(B_s^0rightarrow mu^+mu^-) $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_053104_M8.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> in the TNMSSM are presented and analyzed. The findings indicate that the results in the TNMSSM can fit the updated experimental data well, and the new parameters <inline-formula>\u0000<tex-math><?CDATA $ T_{lambda},;kappa,;lambda $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_053104_M9.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>, clearly affect the theoretical predictions of <inline-formula>\u0000<tex-math><?CDATA $ {rm{Br}}(bar Brightarrow X_sgamma) $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_053104_M10.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> and <inline-formula>\u0000<tex-math><?CDATA $ {rm{Br}}(B_s^0rightarrow mu^+mu^-) $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_053104_M11.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>.","PeriodicalId":10250,"journal":{"name":"中国物理C","volume":"45 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140586972","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 : 2024-05-01DOI: 10.1088/1674-1137/ad2b52
Li-Yang Gao, She-Sheng Xue, Xin Zhang
We consider a new cosmological model (called <inline-formula> <tex-math><?CDATA $ tildeLambda $?></tex-math> <inline-graphic xlink:href="cpc_48_5_051001_M1.jpg" xlink:type="simple"></inline-graphic> </inline-formula>CDM), in which the vacuum energy interacts with matter and radiation, and test this model using the current cosmological observations. Using the CMB+BAO+SN (CBS) dataset to constrain the model, we find that <inline-formula> <tex-math><?CDATA $ H_0 $?></tex-math> <inline-graphic xlink:href="cpc_48_5_051001_M2.jpg" xlink:type="simple"></inline-graphic> </inline-formula> and <inline-formula> <tex-math><?CDATA $ S_8 $?></tex-math> <inline-graphic xlink:href="cpc_48_5_051001_M3.jpg" xlink:type="simple"></inline-graphic> </inline-formula> tensions are relieved to <inline-formula> <tex-math><?CDATA $ 2.87sigma $?></tex-math> <inline-graphic xlink:href="cpc_48_5_051001_M4.jpg" xlink:type="simple"></inline-graphic> </inline-formula> and <inline-formula> <tex-math><?CDATA $ 2.77sigma $?></tex-math> <inline-graphic xlink:href="cpc_48_5_051001_M5.jpg" xlink:type="simple"></inline-graphic> </inline-formula>, respectively. However, in this case, the <inline-formula> <tex-math><?CDATA $ tildeLambda $?></tex-math> <inline-graphic xlink:href="cpc_48_5_051001_M6.jpg" xlink:type="simple"></inline-graphic> </inline-formula>CDM model is not favored by the data, compared with ΛCDM. We find that when the <inline-formula> <tex-math><?CDATA $ H_0 $?></tex-math> <inline-graphic xlink:href="cpc_48_5_051001_M7.jpg" xlink:type="simple"></inline-graphic> </inline-formula> and <inline-formula> <tex-math><?CDATA $ S_8 $?></tex-math> <inline-graphic xlink:href="cpc_48_5_051001_M8.jpg" xlink:type="simple"></inline-graphic> </inline-formula> data are added to the data combination, the situation is significantly improved. In the CBS+<inline-formula> <tex-math><?CDATA $ H_0 $?></tex-math> <inline-graphic xlink:href="cpc_48_5_051001_M9.jpg" xlink:type="simple"></inline-graphic> </inline-formula> case, the model relieves the <inline-formula> <tex-math><?CDATA $ H_0 $?></tex-math> <inline-graphic xlink:href="cpc_48_5_051001_M10.jpg" xlink:type="simple"></inline-graphic> </inline-formula> tension to <inline-formula> <tex-math><?CDATA $ 0.47sigma $?></tex-math> <inline-graphic xlink:href="cpc_48_5_051001_M11.jpg" xlink:type="simple"></inline-graphic> </inline-formula>, and the model is favored over ΛCDM. In the CBS+<inline-formula> <tex-math><?CDATA $ H_0 $?></tex-math> <inline-graphic xlink:href="cpc_48_5_051001_M12.jpg" xlink:type="simple"></inline-graphic> </inline-formula>+<inline-formula> <tex-math><?CDATA $ S_8 $?></tex-math> <inline-graphic xlink:href="cpc_48_5_051001_M13.jpg" xlink:type="simple"></inline-graphic> </inline-formula> case, we obtain a synthetically best situation, in which the <inline-formula> <tex-math><?CDATA $ H_0 $?></tex-math> <inline-graphic xlink:href="cpc_48_5_051001_M14.jpg" xlink:type="simple"></inline-graphic> </inline-formula> and <inline-for
{"title":"Dark energy and matter interacting scenario to relieve H 0 and S 8 tensions* * Supported by the National SKA Program of China (2022SKA0110200, 2022SKA0110203), and the National Natural Science Foundation of China (11975072, 11875102, 11835009)","authors":"Li-Yang Gao, She-Sheng Xue, Xin Zhang","doi":"10.1088/1674-1137/ad2b52","DOIUrl":"https://doi.org/10.1088/1674-1137/ad2b52","url":null,"abstract":"We consider a new cosmological model (called <inline-formula>\u0000<tex-math><?CDATA $ tildeLambda $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_051001_M1.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>CDM), in which the vacuum energy interacts with matter and radiation, and test this model using the current cosmological observations. Using the CMB+BAO+SN (CBS) dataset to constrain the model, we find that <inline-formula>\u0000<tex-math><?CDATA $ H_0 $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_051001_M2.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> and <inline-formula>\u0000<tex-math><?CDATA $ S_8 $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_051001_M3.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> tensions are relieved to <inline-formula>\u0000<tex-math><?CDATA $ 2.87sigma $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_051001_M4.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> and <inline-formula>\u0000<tex-math><?CDATA $ 2.77sigma $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_051001_M5.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>, respectively. However, in this case, the <inline-formula>\u0000<tex-math><?CDATA $ tildeLambda $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_051001_M6.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>CDM model is not favored by the data, compared with ΛCDM. We find that when the <inline-formula>\u0000<tex-math><?CDATA $ H_0 $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_051001_M7.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> and <inline-formula>\u0000<tex-math><?CDATA $ S_8 $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_051001_M8.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> data are added to the data combination, the situation is significantly improved. In the CBS+<inline-formula>\u0000<tex-math><?CDATA $ H_0 $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_051001_M9.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> case, the model relieves the <inline-formula>\u0000<tex-math><?CDATA $ H_0 $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_051001_M10.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> tension to <inline-formula>\u0000<tex-math><?CDATA $ 0.47sigma $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_051001_M11.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>, and the model is favored over ΛCDM. In the CBS+<inline-formula>\u0000<tex-math><?CDATA $ H_0 $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_051001_M12.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>+<inline-formula>\u0000<tex-math><?CDATA $ S_8 $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_051001_M13.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> case, we obtain a synthetically best situation, in which the <inline-formula>\u0000<tex-math><?CDATA $ H_0 $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_051001_M14.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> and <inline-for","PeriodicalId":10250,"journal":{"name":"中国物理C","volume":"52 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140586919","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 : 2024-05-01DOI: 10.1088/1674-1137/ad2a4d
B. Hamil, B. C. Lütfüoğlu
Gravity models given by higher-order scalar curvature corrections are believed to bear important consequences. Einstein-Bel-Robinson (EBR) gravity with quartic curvature modification motivated Sajadi et al. to explore static spherically symmetric black hole solutions using perturbative methods. In this study, inspired by their work, we investigate AdS black hole shadows in EBR gravity and demonstrate how the gravity parameter alters the energy emission rate. Finally, we address the same problem in the presence of plasma, because the black holes are thought to be surrounded by a medium that changes the geodesic of photons.
{"title":"Black hole shadows in Einstein-Bel-Robinson gravity* * Supported by the Internal Project (2023/2211) of Excellent Research of the Faculty of Science of Hradec Králové University","authors":"B. Hamil, B. C. Lütfüoğlu","doi":"10.1088/1674-1137/ad2a4d","DOIUrl":"https://doi.org/10.1088/1674-1137/ad2a4d","url":null,"abstract":"Gravity models given by higher-order scalar curvature corrections are believed to bear important consequences. Einstein-Bel-Robinson (EBR) gravity with quartic curvature modification motivated Sajadi <italic toggle=\"yes\">et al</italic>. to explore static spherically symmetric black hole solutions using perturbative methods. In this study, inspired by their work, we investigate AdS black hole shadows in EBR gravity and demonstrate how the gravity parameter alters the energy emission rate. Finally, we address the same problem in the presence of plasma, because the black holes are thought to be surrounded by a medium that changes the geodesic of photons.","PeriodicalId":10250,"journal":{"name":"中国物理C","volume":"53 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140586961","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 : 2024-05-01DOI: 10.1088/1674-1137/ad2442
Xiu-Wu Wang, Zhi-Gang Wang
In this study, considering the conservation of isospin in the strong decays, we investigate the strong decays of the pentaquark molecule candidate and its possible higher isospin cousin in the framework of the QCD sum rules. Further, the pole residue of the Δ baryon with isospin eigenstate is obtained. If the possible pentaquark molecule candidate could be determined, it would shed light on the interpretations of the states in future experiments.
{"title":"Strong decays of the P c(4312) and its isospin cousin via the QCD sum rules* * Supported by the National Natural Science Foundation (12175068) and the Fundamental Research Funds for the Central Universities of China","authors":"Xiu-Wu Wang, Zhi-Gang Wang","doi":"10.1088/1674-1137/ad2442","DOIUrl":"https://doi.org/10.1088/1674-1137/ad2442","url":null,"abstract":"In this study, considering the conservation of isospin in the strong decays, we investigate the strong decays of the pentaquark molecule candidate <inline-formula>\u0000<tex-math><?CDATA $ P_c(4312) $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_053102_M2.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> and its possible higher isospin cousin <inline-formula>\u0000<tex-math><?CDATA $ P_c(4330) $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_053102_M3.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> in the framework of the QCD sum rules. Further, the pole residue of the Δ baryon with isospin eigenstate <inline-formula>\u0000<tex-math><?CDATA $ |II_3rangle=|frac{3}{2}frac{1}{2}rangle $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_053102_M4.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> is obtained. If the possible pentaquark molecule candidate <inline-formula>\u0000<tex-math><?CDATA $ P_c(4330) $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_053102_M5.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> could be determined, it would shed light on the interpretations of the <inline-formula>\u0000<tex-math><?CDATA $ P_c $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_053102_M6.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> states in future experiments.","PeriodicalId":10250,"journal":{"name":"中国物理C","volume":"40 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140586815","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}
Decays of unstable heavy particles usually involve the coherent sum of several amplitudes, like in a multiple slit experiment. Dedicated amplitude analysis techniques have been widely used to resolve these amplitudes for better understanding of the underlying dynamics. In special cases where two spin-1/2 particles and two (pseudo-) scalar particles are present in the process, multiple equivalent solutions are found owing to intrinsic symmetries in the summed probability density function. In this study, the problem of multiple solutions is discussed, and a scheme to overcome this problem is proposed by fixing some free parameters. Toys are generated to validate the strategy. A new approach to align the helicities of initial- and final-state particles in different decay chains is also introduced.
{"title":"A scheme to fix multiple solutions in amplitude analyses* * Supported by the National Natural Science Foundation of China (NSFC) (12061141007, 12175005) and by the National Key R&D Program of China (2022YFA1601904)","authors":"Yuanning Gao, Tianze Rong, Zhenwei Yang, Chenjia Zhang, Yanxi Zhang","doi":"10.1088/1674-1137/ad2674","DOIUrl":"https://doi.org/10.1088/1674-1137/ad2674","url":null,"abstract":"Decays of unstable heavy particles usually involve the coherent sum of several amplitudes, like in a multiple slit experiment. Dedicated amplitude analysis techniques have been widely used to resolve these amplitudes for better understanding of the underlying dynamics. In special cases where two spin-1/2 particles and two (pseudo-) scalar particles are present in the process, multiple equivalent solutions are found owing to intrinsic symmetries in the summed probability density function. In this study, the problem of multiple solutions is discussed, and a scheme to overcome this problem is proposed by fixing some free parameters. Toys are generated to validate the strategy. A new approach to align the helicities of initial- and final-state particles in different decay chains is also introduced.","PeriodicalId":10250,"journal":{"name":"中国物理C","volume":"80 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140586816","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 : 2024-05-01DOI: 10.1088/1674-1137/ad2a66
Xiao-Yun Wang, Fancong Zeng, Jiyuan Zhang
We systematically analyze the quark and gluon gravitational form factors (GFFs) of the proton by connecting the energy-momentum tensor and near-threshold vector meson photoproduction (NTVMP). Specifically, the quark contributions of GFFs are determined by applying global fitting to the cross section of the lightest vector meson photoproduction. Combined with the gluon GFFs obtained from heavy quarkonium photoproduction data, the complete GFFs are obtained and compared with the experimental results and lattice quantum chromodynamics determinations. In addition, we use the resonance via Padé (RVP) method based on the Schlessinger point method to obtain a model-independent quark D-term distribution through direct analytical continuation of deeply virtual Compton scattering experimental data. If errors are considered, the results obtained with RVP are essentially consistent with those obtained by NTVMP. Moreover, the comprehensive information on GFFs helps to uncover the mass distribution and mechanical properties inside the proton. This study is not only an important basis for delving into the enigmatic properties of the proton, but also has significance for theoretically guiding future JLab and EIC experimental measurements.
{"title":"Gravitational form factors of the proton from near-threshold vector meson photoproduction* * Supported by the National Natural Science Foundation of China (12065014, 12247101) and the Natural Science Foundation of Gansu province (22JR5RA266). We acknowledge the West Light Foundation of the Chinese Academy of Sciences (21JR7RA201)","authors":"Xiao-Yun Wang, Fancong Zeng, Jiyuan Zhang","doi":"10.1088/1674-1137/ad2a66","DOIUrl":"https://doi.org/10.1088/1674-1137/ad2a66","url":null,"abstract":"We systematically analyze the quark and gluon gravitational form factors (GFFs) of the proton by connecting the energy-momentum tensor and near-threshold vector meson photoproduction (NTVMP). Specifically, the quark contributions of GFFs are determined by applying global fitting to the cross section of the lightest vector meson <inline-formula>\u0000<tex-math><?CDATA $ rho^0 $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_054102_M1.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> photoproduction. Combined with the gluon GFFs obtained from heavy quarkonium <inline-formula>\u0000<tex-math><?CDATA $ J/psi $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_054102_M2.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> photoproduction data, the complete GFFs are obtained and compared with the experimental results and lattice quantum chromodynamics determinations. In addition, we use the resonance via Padé (RVP) method based on the Schlessinger point method to obtain a model-independent quark <italic toggle=\"yes\">D</italic>-term distribution through direct analytical continuation of deeply virtual Compton scattering experimental data. If errors are considered, the results obtained with RVP are essentially consistent with those obtained by NTVMP. Moreover, the comprehensive information on GFFs helps to uncover the mass distribution and mechanical properties inside the proton. This study is not only an important basis for delving into the enigmatic properties of the proton, but also has significance for theoretically guiding future JLab and EIC experimental measurements.","PeriodicalId":10250,"journal":{"name":"中国物理C","volume":"28 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140805054","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":"Molecular components in J/ψ and ρ-π puzzle* * Supported by National Natural Science Foundation of China (11805160, 11747040, 11675082) and Qinglan Project of Jiangsu Province in 2021","authors":"Xing-Dao Guo, Dian-Yong Chen, Xue-Qian Li, Zhong-Yuan Yuan, Shijing Sang","doi":"10.1088/1674-1137/ad2a65","DOIUrl":"https://doi.org/10.1088/1674-1137/ad2a65","url":null,"abstract":"Motivated by the large branching fractions of <inline-formula>\u0000<tex-math><?CDATA $ J/psi to f_0 (1710) omega/f_0(1710) phi $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_053110_M1.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> and the light exotic candidates, we found that there may exist molecular states composed of <inline-formula>\u0000<tex-math><?CDATA $ f_0(1710) omega $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_053110_M2.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> and <inline-formula>\u0000<tex-math><?CDATA $ f_0 (1710) phi $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_053110_M3.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>, which correspond to <inline-formula>\u0000<tex-math><?CDATA $ X(2440) $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_053110_M4.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> and <inline-formula>\u0000<tex-math><?CDATA $ X(2680) $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_053110_M5.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> observed a few decades ago. The branching fractions of <inline-formula>\u0000<tex-math><?CDATA $ X(2440) $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_053110_M6.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> and <inline-formula>\u0000<tex-math><?CDATA $ X(2680) $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_053110_M7.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>to various <inline-formula>\u0000<tex-math><?CDATA $ PV $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_053110_M8.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> and <inline-formula>\u0000<tex-math><?CDATA $ KKomega(phi) $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_053110_M9.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> channels were estimated in the molecular scenario. In addition, the large branching fractions of <inline-formula>\u0000<tex-math><?CDATA $ J/psi to f_0 (1710) omega/f_0(1710) phi $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_053110_M10.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> indicate sizable molecular components in the <inline-formula>\u0000<tex-math><?CDATA $ J/psi $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_053110_M11.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> state. Thus, we consider <inline-formula>\u0000<tex-math><?CDATA $ J/psi $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_053110_M12.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>as the superposition of the<inline-formula>\u0000<tex-math><?CDATA $ cbar{c}(1S) $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_053110_M13.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>, <inline-formula>\u0000<tex-math><?CDATA $ f_0(1710) omega $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_053110_M14.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>, and <inline-formula>\u0000<tex-math><?CDATA $ f_0 (1710) phi $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_053110_M15.jp","PeriodicalId":10250,"journal":{"name":"中国物理C","volume":"19 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140805109","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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