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Acta Physica Polonica B最新文献

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Wigner and Husimi Partonic Distributions of the Pion in a Chiral Quark Model 手性夸克模型中Pion的Wigner和Husimi Partonic分布
IF 0.5 4区 物理与天体物理
Acta Physica Polonica B Pub Date : 2023-07-26 DOI: 10.5506/aphyspolb.54.7-a4
W. Broniowski, E. Arriola
{"title":"Wigner and Husimi Partonic Distributions of the Pion in a Chiral Quark Model","authors":"W. Broniowski, E. Arriola","doi":"10.5506/aphyspolb.54.7-a4","DOIUrl":"https://doi.org/10.5506/aphyspolb.54.7-a4","url":null,"abstract":"Generalized transverse momentum distributions (GTMDs), the Wigner, and the Husimi distributions of quarks in the pion are evaluated in a chiral quark model at the one-loop-level. Analytic expressions are obtained for GTMDs, allowing for a qualitative discussion of their features, whereas the Wigner and the Husimi distribution are obtained with numerical integration of simple formulas. We explain the features of the Wigner distributions, in particular their non-positivity. In our model, the Husimi distributions, which are interpreted as coarse-grained Wigner distributions, are not mathematically positive-definite, but the magnitude of their negative values is tiny and occurs at large transverse momenta and impact parameters. Hence, as expected, coarse-graining leads to better behaved functions from the point of view of the probabilistic interpretation.","PeriodicalId":7060,"journal":{"name":"Acta Physica Polonica B","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44469337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
引用次数: 0
Mass and Decay of the (sbar {s}) Member of the 1(^{3}F_{4}) Meson Nonet 1的（sbar｛s｝）成员的质量和衰变(^{3}F_{4} ）介子诺内特
IF 0.5 4区 物理与天体物理
Acta Physica Polonica B Pub Date : 2023-07-20 DOI: 10.5506/aphyspolb.54.7-a1
Xue-Chao Feng, K. Wei
{"title":"Mass and Decay of the (sbar {s}) Member of the 1(^{3}F_{4}) Meson Nonet","authors":"Xue-Chao Feng, K. Wei","doi":"10.5506/aphyspolb.54.7-a1","DOIUrl":"https://doi.org/10.5506/aphyspolb.54.7-a1","url":null,"abstract":"The mass and decay of the $sbar{s}$ member of the $1^{3}F_{4}$ meson nonet are investigated in the framework of the Regge phenomenology and the $^{3}P_{0}$ model. We propose, based on the results, that the assignment of the $sbar{s}$ member of the $1^{3}F_{4}$ meson nonet will require additional testing in the future. Our results also provide information for future studies of the $1^{3}F_{4}$ meson nonet.","PeriodicalId":7060,"journal":{"name":"Acta Physica Polonica B","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46522038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
引用次数: 0
Simultaneous Study of Scattering and Fusion Hindrance Near Coulomb Barrier in F(+)Pb Systems F - (+) Pb体系库仑势垒附近散射和融合阻碍的同时研究
IF 0.5 4区 物理与天体物理
Acta Physica Polonica B Pub Date : 2023-07-11 DOI: 10.5506/APhysPolB.54.4-A1
Kamal Kanta, B. Sahu, Jajati k. Nayak, R. Preethi, B. Sharma, Santosh Kumar
{"title":"Simultaneous Study of Scattering and Fusion Hindrance Near Coulomb Barrier in F(+)Pb Systems","authors":"Kamal Kanta, B. Sahu, Jajati k. Nayak, R. Preethi, B. Sharma, Santosh Kumar","doi":"10.5506/APhysPolB.54.4-A1","DOIUrl":"https://doi.org/10.5506/APhysPolB.54.4-A1","url":null,"abstract":"A phenomenological optical potential is used to study the elastic angular distributions for the system $^{19}F+^{208}Pb$ close to the Coulomb barrier. This potential is constructed by taking into account the flexible potential developed by Ginocchio. The fluctuations in the real and imaginary parts of the optical model potential follow the trends of the threshold anomaly. The set of optical potential parameters needed to analyze the fusion cross sections of the same system are obtained through analysis of the scattering cross sections. Theoretical fusion cross-sections and results from four different experimental groups well agree for a range of energies. Several Fluorine (F) isotopes are used as projectiles in this study of fusion cross-sections by slightly altering the radial parameter. It was found that the fusion process occurs unfettered in the $^{19}F +^{208}Pb$ system below the Coulomb barrier but is seriously hindered in the case of its isotopic projectiles.","PeriodicalId":7060,"journal":{"name":"Acta Physica Polonica B","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41985163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
引用次数: 0
Investigating the Violation of Charge-parity Symmetry Through Top-quark ChromoElectric Dipole Moments by Using Machine Learning Techniques 利用机器学习技术研究顶夸克色电偶极矩对电荷宇称性的破坏
IF 0.5 4区 物理与天体物理
Acta Physica Polonica B Pub Date : 2023-06-20 DOI: 10.5506/APhysPolB.54.5-A4
Bora I¸sıldak, Alper Hayreter, Murat Hüdaverdi̇, F. Ilgin, S. Salva, Ebru ¸Sim¸sek, Sinan Güyer
{"title":"Investigating the Violation of Charge-parity Symmetry Through Top-quark ChromoElectric Dipole Moments by Using Machine Learning Techniques","authors":"Bora I¸sıldak, Alper Hayreter, Murat Hüdaverdi̇, F. Ilgin, S. Salva, Ebru ¸Sim¸sek, Sinan Güyer","doi":"10.5506/APhysPolB.54.5-A4","DOIUrl":"https://doi.org/10.5506/APhysPolB.54.5-A4","url":null,"abstract":"There are a number of studies in the literature on search for Charge-Parity (CP) violating signals in top quark productions at the LHC. In most of these studies, ChromoMagnetic Dipole Moments (CMDM) and ChromoElectric Dipole Moments (CEDM) of top quarks is bounded either by deviations from the Standard Model (SM) cross sections or by T-odd asymmetries in di-muon channels. However, the required precision on these cross section values are far beyond from that of ATLAS or CMS experiments can reach. In this letter, the investigation of CEDM based asymmetries in the semileptonic top pair decays are presented as T-odd asymmetries in CMS experiment. Expected asymmetry values are determined at the detector level using MadGraph5, Pythia8 and Delphes softwares along with the discrimination of the signal and the background with Deep Neural Networks (DNN).","PeriodicalId":7060,"journal":{"name":"Acta Physica Polonica B","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48092141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
引用次数: 0
The Role of Scalar and Mass Interactions in a Relativistic Model of the Charmonium Spectrum 标量和质量相互作用在Charmonium谱的相对论模型中的作用
IF 0.5 4区 物理与天体物理
Acta Physica Polonica B Pub Date : 2023-02-02 DOI: 10.5506/APhysPolB.54.1-A2
M. Sanctis
{"title":"The Role of Scalar and Mass Interactions in a Relativistic Model of the Charmonium Spectrum","authors":"M. Sanctis","doi":"10.5506/APhysPolB.54.1-A2","DOIUrl":"https://doi.org/10.5506/APhysPolB.54.1-A2","url":null,"abstract":"Lorentz scalar and mass interactions are studied in more detail in the framework of a reduced Dirac equation for heavy quark-antiquark mesons. A microscopic model for these interactions is proposed and analyzed. The charmonium mass spectrum is reproduced by means of two free parameters; a third parameter is fixed by means of a phenomenological hypothesis in accordance with the model.","PeriodicalId":7060,"journal":{"name":"Acta Physica Polonica B","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42038701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
引用次数: 0
Defect Wormhole: A Traversable Wormhole Without Exotic Matter 缺陷虫洞：一个没有外来物质的可穿越虫洞
IF 0.5 4区 物理与天体物理
Acta Physica Polonica B Pub Date : 2022-12-30 DOI: 10.5506/APhysPolB.54.5-A3
F. Klinkhamer
{"title":"Defect Wormhole: A Traversable Wormhole Without Exotic Matter","authors":"F. Klinkhamer","doi":"10.5506/APhysPolB.54.5-A3","DOIUrl":"https://doi.org/10.5506/APhysPolB.54.5-A3","url":null,"abstract":"We present a traversable-wormhole solution of the gravitational field equation of General Relativity without need of exotic matter (exotic matter can, for example, have negative energy density and vanishing isotropic pressure). Instead of exotic matter, the solution relies on a 3-dimensional\"spacetime defect\"characterized by a locally vanishing metric determinant.","PeriodicalId":7060,"journal":{"name":"Acta Physica Polonica B","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42814148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
引用次数: 10
Should Unstable Quantum Field Theories be Lorentz-invariant? 不稳定量子场论应该是洛伦兹不变量吗？
IF 0.5 4区 物理与天体物理
Acta Physica Polonica B Pub Date : 2022-12-19 DOI: 10.5506/APhysPolB.53.11-A4
L. Gavassino
{"title":"Should Unstable Quantum Field Theories be Lorentz-invariant?","authors":"L. Gavassino","doi":"10.5506/APhysPolB.53.11-A4","DOIUrl":"https://doi.org/10.5506/APhysPolB.53.11-A4","url":null,"abstract":"An unstable field theory is what we obtain when we linearise the equations of an interacting field theory near an unstable state. Theories of this kind are adopted to model the onset of spontaneous symmetry breakings, when the fields are sitting on the top of the Mexican hat, and they start to “roll down” to the bottom. At present, there exists no rigorous proof that unstable quantum field theories are Lorentz-invariant (in the sense of Wigner’s theorem). Here, we show that they shouldn’t be. In fact, unstable theories always have a limited regime of applicability, and they are valid only for a very short time. As consequence, there is a preferred simultaneity hyperplane, along which the unstable theory is everywhere applicable, while a generic observer (whose four-velocity is not orthogonal to such hyperplane) must use the full non-linear theory. In summary: the current quantization schemes are “ok”, independently from whether they lead to a Lorentz-invariant theory.","PeriodicalId":7060,"journal":{"name":"Acta Physica Polonica B","volume":"24 2","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41248583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
引用次数: 0
Comparative Study of the 1–2 Exchange Symmetries in Neutrino Frameworks with Global and Local Validities 具有整体有效性和局部有效性的中微子框架中1-2交换对称性的比较研究
IF 0.5 4区 物理与天体物理
Acta Physica Polonica B Pub Date : 2022-12-13 DOI: 10.5506/APhysPolB.54.4-A3
H. Minakata
{"title":"Comparative Study of the 1–2 Exchange Symmetries in Neutrino Frameworks with Global and Local Validities","authors":"H. Minakata","doi":"10.5506/APhysPolB.54.4-A3","DOIUrl":"https://doi.org/10.5506/APhysPolB.54.4-A3","url":null,"abstract":"A new picture ``one-resonance - one-symmetry'' has been proposed recently to reveal nature of the reparametrization symmetry in neutrino oscillation in matter and where it resides: Symmetry of $i leftrightarrow j$ state-exchange type exists at around a resonance with $i$ and $j$ being the states which participate in the level crossing. Consistently, the 1-2 and 1-3 state exchange symmetries are identified at around the solar and atmospheric resonances, respectively, in the locally-valid frameworks. On the other hand, the Denton {it et al.} (DMP) perturbation theory, a globally-valid framework, has the 1-2 exchange symmetry which is akin to the one in the aforementioned solar-resonance perturbation (SRP) theory. In our picture, the symmetry must be associated with the resonance, not the framework, and if so these two 1-2 symmetries must be identical to each other. We conduct a comparative study of the 1-2 symmetries possessed by SRP and DMP to confirm their identity. An almost identity is verified, but in a highly nontrivial way.","PeriodicalId":7060,"journal":{"name":"Acta Physica Polonica B","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46139530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
引用次数: 2
Massive Dark Photons as Hot Dark Matter 大质量暗光子是热暗物质
IF 0.5 4区 物理与天体物理
Acta Physica Polonica B Pub Date : 2022-11-21 DOI: 10.5506/aphyspolb.53.11-a2
S. Ennadifi
{"title":"Massive Dark Photons as Hot Dark Matter","authors":"S. Ennadifi","doi":"10.5506/aphyspolb.53.11-a2","DOIUrl":"https://doi.org/10.5506/aphyspolb.53.11-a2","url":null,"abstract":"Motivated by the growing interest in the existence of new massive gauge bosons, we suggest that massive dark photons A ′ can be a consequence of a broken new abelian symmetry U ( 1 ) ′ X . Such a dark symmetry U ( 1 ) ′ D is afterwards supposed to be associated with the conservation of the weak number W belonging to the Weakling Interacting Slim Particles U ( 1 ) W , being a strong candidate for Hot Dark Matter. The latters correspond then to light dark photons m ′ A . keV from a weak symmetry breaking scale & 10 keV .","PeriodicalId":7060,"journal":{"name":"Acta Physica Polonica B","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44902968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
引用次数: 0
Towards the Assignments for (1^{1}D_{2}) and (1^{3}D_{2}) Meson Nonets 走向（1）的作业^{1}D_{2} ）和（1^{3}D_{2} ）介子诺内特
IF 0.5 4区 物理与天体物理
Acta Physica Polonica B Pub Date : 2022-11-08 DOI: 10.5506/aphyspolb.53.10-a4
Xue-Chao Feng, K. Wei, Jie Wu, Xue Zhen Zhai, ShiZhuo Wang
{"title":"Towards the Assignments for (1^{1}D_{2}) and (1^{3}D_{2}) Meson Nonets","authors":"Xue-Chao Feng, K. Wei, Jie Wu, Xue Zhen Zhai, ShiZhuo Wang","doi":"10.5506/aphyspolb.53.10-a4","DOIUrl":"https://doi.org/10.5506/aphyspolb.53.10-a4","url":null,"abstract":"In this work, we investigate the mass spectrum of $1^{1}D_{2}$ and $1^{3}D_{2}$ meson nonets in the framework of the meson mass matrix and Regge phenomenology. The results are compared with the values from different phenomenological models and may be useful for the assignment of the $1^{1}D_{2}$ and $1^{3}D_{2}$ meson nonets in the future.","PeriodicalId":7060,"journal":{"name":"Acta Physica Polonica B","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49523312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
引用次数: 0
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