Pub Date : 2024-05-01DOI: 10.1088/1674-1137/ad24d1
Wei-Hao Han, Ye Xing, Ji Xu
Here, we study the production of charmonium pentaquarks from bottom baryon and B-meson decays under the flavor symmetry. Decay amplitudes for various processes are parameterized in terms of irreducible nonperturbative amplitudes. Numerous relations between decay widths are deduced. Moreover, the strong decays of pentaquarks are considered. Our results can be tested in future measurements at LHCb, Belle II, and CEPC. Once decay branching fractions are measured, this study will be useful for the exploration of new decay channels and pentaquark states.
在这里，我们研究了在味道对称条件下底重子和B-介子衰变产生的粲五夸克。各种过程的衰变振幅以不可还原的非微扰振幅为参数。推导出了衰变宽度之间的许多关系。此外，还考虑了五夸克的强衰变。我们的结果可以在 LHCb、Belle II 和 CEPC 的未来测量中得到检验。一旦测量到衰变分支分数，这项研究将有助于探索新的衰变通道和五夸克态。
{"title":"Production of charmonium pentaquarks from b-baryon and B-meson decays: SU(3) analysis* * W. H. H and J. X. is supported in part by the National Natural Science Foundation of China (12105247), the China Postdoctoral Science Foundation (2021M702957). Y.X is supported in part by the National Natural Science Foundation of China (12005294)","authors":"Wei-Hao Han, Ye Xing, Ji Xu","doi":"10.1088/1674-1137/ad24d1","DOIUrl":"https://doi.org/10.1088/1674-1137/ad24d1","url":null,"abstract":"Here, we study the production of charmonium pentaquarks <inline-formula>\u0000<tex-math><?CDATA $ c bar c q q q $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_053106_M1.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> from bottom baryon and <italic toggle=\"yes\">B</italic>-meson decays under the flavor <inline-formula>\u0000<tex-math><?CDATA $S U(3) $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_053106_Z-20240229104014.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> symmetry. Decay amplitudes for various processes are parameterized in terms of <inline-formula>\u0000<tex-math><?CDATA $S U(3) $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_5_053106_Z-20240229104040.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> irreducible nonperturbative amplitudes. Numerous relations between decay widths are deduced. Moreover, the strong decays of pentaquarks are considered. Our results can be tested in future measurements at LHCb, Belle II, and CEPC. Once decay branching fractions are measured, this study will be useful for the exploration of new decay channels and pentaquark states.","PeriodicalId":10250,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":3.6,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140586918","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 : 2024-04-30DOI: 10.1088/1674-1137/ad2363
Jian-Hua Gao, 建华 高, Shi-Zheng Yang and 诗正 杨
We revisit the spin effects induced by thermal vorticity by calculating them directly from the spin-dependent distribution functions. For spin-1/2 particles, we provide the polarization up to the first order of thermal vorticity and compare it with the usual results calculated from the spin vector. For spin-1 particles, we show that all the non-diagonal elements vanish and there is no spin alignment up to the first order of thermal vortcity. We present the spin alignment at second-order contribution from thermal vorticity. We also show that the spin effects for both Dirac and vector particles receive an extra contribution when the spin direction is associated with the momentum of the particle.
{"title":"Revisiting the spin effects induced by thermal vorticity*","authors":"Jian-Hua Gao, 建华 高, Shi-Zheng Yang and 诗正 杨","doi":"10.1088/1674-1137/ad2363","DOIUrl":"https://doi.org/10.1088/1674-1137/ad2363","url":null,"abstract":"We revisit the spin effects induced by thermal vorticity by calculating them directly from the spin-dependent distribution functions. For spin-1/2 particles, we provide the polarization up to the first order of thermal vorticity and compare it with the usual results calculated from the spin vector. For spin-1 particles, we show that all the non-diagonal elements vanish and there is no spin alignment up to the first order of thermal vortcity. We present the spin alignment at second-order contribution from thermal vorticity. We also show that the spin effects for both Dirac and vector particles receive an extra contribution when the spin direction is associated with the momentum of the particle.","PeriodicalId":10250,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":3.6,"publicationDate":"2024-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140805022","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 : 2024-04-30DOI: 10.1088/1674-1137/ad2441
Tran Dzung Tri, Thanh Huy Nguyen and Khiem Hong Phan
We present one-loop contributions for with and in the extension of the standard model. In the phenomenological results, the signal strengths for at the Large Hadron Collider and for at future lepton colliders are analyzed in the physical parameter space for both the vector and chiral models. We found that the contributions from the neutral gauge boson to the signal strengths are rather small. Consequently, the effects will be difficult to probe at future colliders. However, the impacts of charged Higgs and CP-odd Higgs in the chiral model on the signal strengths are significant and can be measured with the help of the initial polarization beams at future lepton colliders.
{"title":"One-loop contributions for and in the extension of the standard model*","authors":"Tran Dzung Tri, Thanh Huy Nguyen and Khiem Hong Phan","doi":"10.1088/1674-1137/ad2441","DOIUrl":"https://doi.org/10.1088/1674-1137/ad2441","url":null,"abstract":"We present one-loop contributions for with and in the extension of the standard model. In the phenomenological results, the signal strengths for at the Large Hadron Collider and for at future lepton colliders are analyzed in the physical parameter space for both the vector and chiral models. We found that the contributions from the neutral gauge boson to the signal strengths are rather small. Consequently, the effects will be difficult to probe at future colliders. However, the impacts of charged Higgs and CP-odd Higgs in the chiral model on the signal strengths are significant and can be measured with the help of the initial polarization beams at future lepton colliders.","PeriodicalId":10250,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":3.6,"publicationDate":"2024-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140805174","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 : 2024-04-01DOI: 10.1088/1674-1137/ad2b4f
He-Xu Zhang, Shinya Matsuzaki, Hiroyuki Ishida
We discuss the gravitational wave (GW) spectra predicted from the electroweak scalegenesis of the Higgs portal type with a large number of dark chiral flavors, which many flavor QCD would underlie and give the dynamical explanation of the negative Higgs portal coupling required to trigger the electroweak symmetry breaking. We employ the linear-sigma model as the low-energy description of dark many flavor QCD and show that the model undergoes ultra-supercooling due to the produced strong first-order thermal phase transition along the (approximately realized) flat direction based on the Gildener-Weinberg mechanism. Passing through evaluation of the bubble nucleation/percolation, we address the reheating and relaxation processes, which are generically non-thermal and nonadiabatic. Parametrizing the reheating epoch in terms of the e-folding number, we propose proper formulae for the redshift effects on the GW frequencies and signal spectra. It then turns out that the ultra-supercooling predicted from the Higgs-portal scalegenesis generically yields none of GW signals with the frequencies as low as nano Hz, unless the released latent heat is transported into another sector other than reheating the universe. Instead, models of this class prefer to give the higher frequency signals and still keeps the future prospected detection sensitivity, like at LISA, BBO, and DECIGO, etc. We also find that with large flavors in the dark sector, the GW signals are made further smaller and the peak frequencies higher. Characteristic phenomenological consequences related to the multiple chiral scalars include the prediction of dark pions with the mass much less than TeV scale, which is also briefly addressed.
{"title":"Gravitational wave footprints from Higgs-portal scalegenesis with multiple dark chiral scalars* * Supported in part by the National Science Foundation of China (NSFC) (11747308, 11975108, 12047569), the Seeds Funding of Jilin University (S.M.), and Toyama First Bank, Ltd (H.I.)","authors":"He-Xu Zhang, Shinya Matsuzaki, Hiroyuki Ishida","doi":"10.1088/1674-1137/ad2b4f","DOIUrl":"https://doi.org/10.1088/1674-1137/ad2b4f","url":null,"abstract":"We discuss the gravitational wave (GW) spectra predicted from the electroweak scalegenesis of the Higgs portal type with a large number of dark chiral flavors, which many flavor QCD would underlie and give the dynamical explanation of the negative Higgs portal coupling required to trigger the electroweak symmetry breaking. We employ the linear-sigma model as the low-energy description of dark many flavor QCD and show that the model undergoes ultra-supercooling due to the produced strong first-order thermal phase transition along the (approximately realized) flat direction based on the Gildener-Weinberg mechanism. Passing through evaluation of the bubble nucleation/percolation, we address the reheating and relaxation processes, which are generically non-thermal and nonadiabatic. Parametrizing the reheating epoch in terms of the e-folding number, we propose proper formulae for the redshift effects on the GW frequencies and signal spectra. It then turns out that the ultra-supercooling predicted from the Higgs-portal scalegenesis generically yields none of GW signals with the frequencies as low as nano Hz, unless the released latent heat is transported into another sector other than reheating the universe. Instead, models of this class prefer to give the higher frequency signals and still keeps the future prospected detection sensitivity, like at LISA, BBO, and DECIGO, etc. We also find that with large flavors in the dark sector, the GW signals are made further smaller and the peak frequencies higher. Characteristic phenomenological consequences related to the multiple chiral scalars include the prediction of dark pions with the mass much less than TeV scale, which is also briefly addressed.","PeriodicalId":10250,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":3.6,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140316686","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}
Luminosity monitoring at colliders was investigated using Monte Carlo event generator and integrator for simulation of Bhabha scattering at low angles. Results are presented for center-of-mass energies of the Z boson resonance and at 240 GeV for the conditions of typical luminosity detectors. It is shown that bremsstrahlung events with extremely low electron scattering angles are relevant to match the precision tags of future electron-positron colliders.
{"title":"Monte Carlo programs for small-angle Bhabha scattering* * Supported by the Russian Science Foundation (project No. 22-12-00021)","authors":"A.B. Arbuzov, S.G. Bondarenko, I.R. Boyko, L.V. Kalinovskaya, A.A. Kampf, R.R. Sadykov, V.L. Yermolchyk","doi":"10.1088/1674-1137/ad1fe6","DOIUrl":"https://doi.org/10.1088/1674-1137/ad1fe6","url":null,"abstract":"Luminosity monitoring at <inline-formula>\u0000<tex-math><?CDATA $ e^+e^- $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_4_043002_M2.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> colliders was investigated using <inline-formula>\u0000<tex-math><?CDATA $mathrm{SANC}$?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_4_043002_M3.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> Monte Carlo event generator <inline-formula>\u0000<tex-math><?CDATA $mathrm{ReneSANCe}$?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_4_043002_M4.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> and integrator <inline-formula>\u0000<tex-math><?CDATA $mathrm{MCSANC}$?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_4_043002_M5.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> for simulation of Bhabha scattering at low angles. Results are presented for center-of-mass energies of the <italic toggle=\"yes\">Z</italic> boson resonance and at 240 GeV for the conditions of typical luminosity detectors. It is shown that bremsstrahlung events with extremely low electron scattering angles are relevant to match the precision tags of future electron-positron colliders.","PeriodicalId":10250,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":3.6,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140316835","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 : 2024-04-01DOI: 10.1088/1674-1137/ad1cda
Zhe Li, Kenny C. Y. Ng, Songzhan Chen, Yuncheng Nan, Huihai He
Cosmic rays can interact with the solar atmosphere and produce a slew of secondary messengers, making the Sun a bright gamma-ray source in the sky. Detailed observations with Fermi-LAT have shown that these interactions must be strongly affected by solar magnetic fields in order to produce a wide range of observational features, such as a high flux and hard spectrum. However, the detailed mechanisms behind these features are still a mystery. In this study, we tackle this problem by performing particle-interaction simulations in the solar atmosphere in the presence of coronal magnetic fields using the potential field source surface (PFSS) model. We find that low-energy (~ GeV) gamma-ray production is significantly enhanced by the coronal magnetic fields, but the enhancement decreases rapidly with energy. The enhancement directly correlates with the production of gamma rays with large deviation angles relative to the input cosmic-ray direction. We conclude that coronal magnetic fields are essential for correctly modeling solar disk gamma rays below 10 GeV, but above that, the effect of coronal magnetic fields diminishes. Other magnetic field structures are needed to explain the high-energy disk emission.
{"title":"Simulating gamma-ray production from cosmic rays interacting with the solar atmosphere in the presence of coronal magnetic fields* * Supported in China by the NSFC (12261160362, 12022502). KCYN is supported by grants provided by the NSFC (12322517, N_CUHK456/22) and RGC (24302721, 14305822, 14308023)","authors":"Zhe Li, Kenny C. Y. Ng, Songzhan Chen, Yuncheng Nan, Huihai He","doi":"10.1088/1674-1137/ad1cda","DOIUrl":"https://doi.org/10.1088/1674-1137/ad1cda","url":null,"abstract":"Cosmic rays can interact with the solar atmosphere and produce a slew of secondary messengers, making the Sun a bright gamma-ray source in the sky. Detailed observations with Fermi-LAT have shown that these interactions must be strongly affected by solar magnetic fields in order to produce a wide range of observational features, such as a high flux and hard spectrum. However, the detailed mechanisms behind these features are still a mystery. In this study, we tackle this problem by performing particle-interaction simulations in the solar atmosphere in the presence of coronal magnetic fields using the potential field source surface (PFSS) model. We find that low-energy (~ GeV) gamma-ray production is significantly enhanced by the coronal magnetic fields, but the enhancement decreases rapidly with energy. The enhancement directly correlates with the production of gamma rays with large deviation angles relative to the input cosmic-ray direction. We conclude that coronal magnetic fields are essential for correctly modeling solar disk gamma rays below 10 GeV, but above that, the effect of coronal magnetic fields diminishes. Other magnetic field structures are needed to explain the high-energy disk emission.","PeriodicalId":10250,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":3.6,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140310889","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}
Glitches represent a category of non-Gaussian and transient noise that frequently intersects with gravitational wave (GW) signals, thereby exerting a notable impact on the processing of GW data. The inference of GW parameters, crucial for GW astronomy research, is particularly susceptible to such interference. In this study, we pioneer the utilization of a temporal and time-spectral fusion normalizing flow for likelihood-free inference of GW parameters, seamlessly integrating the high temporal resolution of the time domain with the frequency separation characteristics of both time and frequency domains. Remarkably, our findings indicate that the accuracy of this inference method is comparable to that of traditional non-glitch sampling techniques. Furthermore, our approach exhibits a greater efficiency, boasting processing times on the order of milliseconds. In conclusion, the application of a normalizing flow emerges as pivotal in handling GW signals affected by transient noises, offering a promising avenue for enhancing the field of GW astronomy research.
{"title":"Efficient parameter inference for gravitational wave signals in the presence of transient noises using temporal and time-spectral fusion normalizing flow* * Supported by the National SKA Program of China (2022SKA0110200, 2022SKA0110203), the National Natural Science Foundation of China (11975072, 11875102, 11835009), and the National 111 Project (B16009)","authors":"Tian-Yang Sun, Chun-Yu Xiong, Shang-Jie Jin, Yu-Xin Wang, Jing-Fei Zhang, Xin Zhang","doi":"10.1088/1674-1137/ad2a5f","DOIUrl":"https://doi.org/10.1088/1674-1137/ad2a5f","url":null,"abstract":"Glitches represent a category of non-Gaussian and transient noise that frequently intersects with gravitational wave (GW) signals, thereby exerting a notable impact on the processing of GW data. The inference of GW parameters, crucial for GW astronomy research, is particularly susceptible to such interference. In this study, we pioneer the utilization of a temporal and time-spectral fusion normalizing flow for likelihood-free inference of GW parameters, seamlessly integrating the high temporal resolution of the time domain with the frequency separation characteristics of both time and frequency domains. Remarkably, our findings indicate that the accuracy of this inference method is comparable to that of traditional non-glitch sampling techniques. Furthermore, our approach exhibits a greater efficiency, boasting processing times on the order of milliseconds. In conclusion, the application of a normalizing flow emerges as pivotal in handling GW signals affected by transient noises, offering a promising avenue for enhancing the field of GW astronomy research.","PeriodicalId":10250,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":3.6,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140311334","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 : 2024-04-01DOI: 10.1088/1674-1137/ad243e
Jin Ma, Sheng-Quan Wang, Ting Sun, Jian-Ming Shen, Xing-Gang Wu
In this study, we reanalyze the top-quark pair production at next-to-next-to-leading order (NNLO) in quantum chromodynamics (QCD) at future colliders using the Principle of Maximum Conformality (PMC) method. The PMC renormalization scales in are determined by absorbing the non-conformal β terms by recursively using the Renormalization Group Equation (RGE). Unlike the conventional scale-setting method of fixing the scale at the center-of-mass energy , the determined PMC scale is far smaller than the and increases with the , yielding the correct physical behavior for the top-quark pair production process. Moreover, the convergence of the pQCD series for the top-quark pair production is greatly improved owing to the elimination of the renormalon divergence. For a typical collision energy of GeV, the PMC scale is GeV; the QCD correction factor K for conventional results is , where the first error is caused by varying the scale and the second error is from the top-quark mass
在本研究中，我们利用最大共形原理（PMC）方法，在未来对撞机上重新分析了量子色动力学（QCD）中次前阶（NNLO）的顶夸克对产生。PMC中的重正化尺度是通过递归使用重正化群方程（Renormalization Group Equation，RGE）吸收非共形β项来确定的。与将尺度固定在质量中心能量上的传统尺度设定方法不同，所确定的 PMC 尺度远远小于 ，并随着 ，的增大而增大，从而产生了正确的顶夸克对产生过程的物理行为。此外，由于消除了重正子发散，pQCD 序列对顶夸克对产生的收敛性大大提高。对于 GeV 的典型对撞能量，PMC 尺度为 GeV；传统结果的 QCD 修正系数 K 为 ，其中第一个误差由尺度变化引起，第二个误差来自顶夸克质量 GeV。应用 PMC 后，消除了重正化尺度的不确定性，QCD 修正系数 K 提高到 ，其中误差来自顶夸克质量 GeV。PMC对顶夸克对产生的改进预测有助于在未来对撞机上详细研究顶夸克的性质。
{"title":"Revisiting the top-quark pair production at future e + e − colliders* * Supported in part by the Natural Science Foundation of China (12175025, 12147102, 12265011), by the Projects of Guizhou Provincial Department (YQK[2023]016, ZK[2023]141, [2020]1Y027, GZMUZK[2022]PT01)","authors":"Jin Ma, Sheng-Quan Wang, Ting Sun, Jian-Ming Shen, Xing-Gang Wu","doi":"10.1088/1674-1137/ad243e","DOIUrl":"https://doi.org/10.1088/1674-1137/ad243e","url":null,"abstract":"In this study, we reanalyze the top-quark pair production at next-to-next-to-leading order (NNLO) in quantum chromodynamics (QCD) at future <inline-formula>\u0000<tex-math><?CDATA $ e^+e^- $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_4_043105_M2.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> colliders using the Principle of Maximum Conformality (PMC) method. The PMC renormalization scales in <inline-formula>\u0000<tex-math><?CDATA $ alpha_s $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_4_043105_M3.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> are determined by absorbing the non-conformal <italic toggle=\"yes\">β</italic> terms by recursively using the Renormalization Group Equation (RGE). Unlike the conventional scale-setting method of fixing the scale at the center-of-mass energy <inline-formula>\u0000<tex-math><?CDATA $ mu_r=sqrt{s} $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_4_043105_M4.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>, the determined PMC scale <inline-formula>\u0000<tex-math><?CDATA $ Q_star $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_4_043105_M5.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> is far smaller than the <inline-formula>\u0000<tex-math><?CDATA $ sqrt{s} $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_4_043105_M6.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> and increases with the <inline-formula>\u0000<tex-math><?CDATA $ sqrt{s} $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_4_043105_M7.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>, yielding the correct physical behavior for the top-quark pair production process. Moreover, the convergence of the pQCD series for the top-quark pair production is greatly improved owing to the elimination of the renormalon divergence. For a typical collision energy of <inline-formula>\u0000<tex-math><?CDATA $ sqrt{s}=500 $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_4_043105_M8.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> GeV, the PMC scale is <inline-formula>\u0000<tex-math><?CDATA $ Q_star=107 $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_4_043105_M9.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> GeV; the QCD correction factor <italic toggle=\"yes\">K</italic> for conventional results is <inline-formula>\u0000<tex-math><?CDATA $ Ksim1+0.1244^{+0.0102+0.0012}_{-0.0087-0.0011}+0.0184^{-0.0086+0.0002}_{+0.0061-0.0003} $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_4_043105_M10.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>, where the first error is caused by varying the scale <inline-formula>\u0000<tex-math><?CDATA $ mu_rin[sqrt{s}/2, 2sqrt{s}] $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_4_043105_M11.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> and the second error is from the top-quark mass <inline-formula>\u0000<tex-math><?CDATA $ Delta{m_t}=pm0.7 $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_4_043105_M12.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inli","PeriodicalId":10250,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":3.6,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140316609","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 : 2024-04-01DOI: 10.1088/1674-1137/ad1dcd
Brahim Asfour, Aatifa Bargach, Ahmed Errahmani, Taoufik Ouali
In this paper, we propose a hybrid metric Palatini approach in which the Palatini scalar curvature is non minimally coupled to the scalar field. We derive Einstein's field equations, i.e., the equations of motion of the scalar field. Furthermore, the background and perturbative parameters are obtained by means of Friedmann equations in the slow roll regime. The analysis of cosmological perturbations allowed us to obtain the main inflationary parameters, e.g., the scalar spectral indexand tensor to scalar ratio r. From this perspective, as an application of our analysis, we consider the Higgs field with quartic potential, which plays the inflaton role, and show that predictions of Higgs hybrid inflation are in good agreement with recent observational data [Astron. Astrophys. 641, 61 (2020)].
{"title":"Higgs inflation model with non-minimal coupling in hybrid Palatini approach","authors":"Brahim Asfour, Aatifa Bargach, Ahmed Errahmani, Taoufik Ouali","doi":"10.1088/1674-1137/ad1dcd","DOIUrl":"https://doi.org/10.1088/1674-1137/ad1dcd","url":null,"abstract":"In this paper, we propose a hybrid metric Palatini approach in which the Palatini scalar curvature is non minimally coupled to the scalar field. We derive Einstein's field equations, i.e., the equations of motion of the scalar field. Furthermore, the background and perturbative parameters are obtained by means of Friedmann equations in the slow roll regime. The analysis of cosmological perturbations allowed us to obtain the main inflationary parameters, e.g., the scalar spectral index<inline-formula>\u0000<tex-math><?CDATA $ n_s $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_4_045104_M1.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>and tensor to scalar ratio <italic toggle=\"yes\">r</italic>. From this perspective, as an application of our analysis, we consider the Higgs field with quartic potential, which plays the inflaton role, and show that predictions of Higgs hybrid inflation are in good agreement with recent observational data [Astron. Astrophys. 641, 61 (2020)].","PeriodicalId":10250,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":3.6,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140311070","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 : 2024-04-01DOI: 10.1088/1674-1137/ad1a0b
Chang Chen, Ce Meng, Zhiguang Xiao, Han-Qing Zheng
Recently, the LHCb experimental group found an exotic state from the process. A key question is whether it is just a molecule or may have a confined tetraquark ingredient. To investigate this, different methods were used, including a two-channel ( and ) K-matrix unitarization and a single-channel Flatté-like parametrization method analyzed utilizing the pole counting rule and spectral density function sum rule. These analyses demonstrated that is a molecular state, although the possibility that there may exist an elementary ingredient cannot be excluded, according to an approximate analysis of its production rate.
{"title":"Some remarks on compositeness of * * Supported in part by the National Nature Science Foundations of China (12335002, 12375078, 11975028). H.Q. Zheng and Z. Xiao are also Supported by \"the Fundamental Research Funds for the Central Universities\"","authors":"Chang Chen, Ce Meng, Zhiguang Xiao, Han-Qing Zheng","doi":"10.1088/1674-1137/ad1a0b","DOIUrl":"https://doi.org/10.1088/1674-1137/ad1a0b","url":null,"abstract":"Recently, the LHCb experimental group found an exotic state <inline-formula>\u0000<tex-math><?CDATA $ T^+_{cc} $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_4_043102_M1.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> from the <inline-formula>\u0000<tex-math><?CDATA $ pp to D^0D^0pi^+ + X $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_4_043102_M2.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> process. A key question is whether it is just a molecule or may have a confined tetraquark ingredient. To investigate this, different methods were used, including a two-channel (<inline-formula>\u0000<tex-math><?CDATA $ D^{*+}D^0 $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_4_043102_M3.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> and <inline-formula>\u0000<tex-math><?CDATA $ D^{*0}D^+ $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_4_043102_M4.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>) <italic toggle=\"yes\">K</italic>-matrix unitarization and a single-channel Flatté-like parametrization method analyzed utilizing the pole counting rule and spectral density function sum rule. These analyses demonstrated that <inline-formula>\u0000<tex-math><?CDATA $ T^+_{cc} $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_4_043102_M5.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> is a molecular state, although the possibility that there may exist an elementary ingredient cannot be excluded, according to an approximate analysis of its production rate.","PeriodicalId":10250,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":3.6,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140311079","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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