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Acta Physica Polonica B最新文献

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Overview of CMS Results — Recent Highlights CMS结果概述-最近的亮点
IF 0.5 4区 物理与天体物理
Acta Physica Polonica B Pub Date : 2021-01-01 DOI: 10.5506/aphyspolb.52.889
B. Clerbaux
{"title":"Overview of CMS Results — Recent Highlights","authors":"B. Clerbaux","doi":"10.5506/aphyspolb.52.889","DOIUrl":"https://doi.org/10.5506/aphyspolb.52.889","url":null,"abstract":"","PeriodicalId":7060,"journal":{"name":"Acta Physica Polonica B","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70739348","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
Exclusive Dilepton Production in Ultraperipheral Lead–Lead Collisions in the ATLAS Experiment ATLAS实验中超外围铅-铅碰撞的独占双轻子产生
IF 0.5 4区 物理与天体物理
Acta Physica Polonica B Pub Date : 2021-01-01 DOI: 10.5506/aphyspolb.52.1039
A. Ogrodnik
{"title":"Exclusive Dilepton Production in Ultraperipheral Lead–Lead Collisions in the ATLAS Experiment","authors":"A. Ogrodnik","doi":"10.5506/aphyspolb.52.1039","DOIUrl":"https://doi.org/10.5506/aphyspolb.52.1039","url":null,"abstract":"","PeriodicalId":7060,"journal":{"name":"Acta Physica Polonica B","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70738105","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 (varepsilon '/varepsilon )-story: 1976–2021 故事：1976–2021
IF 0.5 4区 物理与天体物理
Acta Physica Polonica B Pub Date : 2020-12-31 DOI: 10.5506/APHYSPOLB.52.7
A. Buras
{"title":"The (varepsilon '/varepsilon )-story: 1976–2021","authors":"A. Buras","doi":"10.5506/APHYSPOLB.52.7","DOIUrl":"https://doi.org/10.5506/APHYSPOLB.52.7","url":null,"abstract":"The ratio $epsilon'/epsilon$ measures the size of the direct CP violation in $K_Ltopipi$ decays $(epsilon^prime)$ relative to the indirect one described by $epsilon$ and is very sensitive to new sources of CP violation. As such it played a prominent role in particle physics already for 45 years. Due to the smallness of $epsilon'/epsilon$ its measurement required heroic efforts in the 1980s and the 1990s on both sides of the Atlantic with final results presented by NA48 and KTeV collaborations 20 years ago. Unfortunately, even 45 years after the first calculation of $epsilon'/epsilon$ we do not know to which degree the Standard Model agrees with this data and how large is the room left for new physics contributions to this ratio. This is due to significant non-perturbative (hadronic) uncertainties accompanied by partial cancellation between the QCD penguin contributions and electroweak penguin contributions. While the significant control over the short distance perturbative effects has been achieved already in the early 1990s, with several improvements since then, different views on the non-perturbative contributions to $epsilon'/epsilon$ have been expressed by different authors over last thirty years. In fact even today the uncertainty in the room left for NP contributions to $epsilon'/epsilon$ is very significant. My own work on $epsilon'/epsilon$ started in 1983 and involved both perturbative and non-perturbative calculations. This writing is a non-technical recollection of the steps which led to the present status of $epsilon'/epsilon$ including several historical remarks not known to everybody. The present status of the $Delta I=1/2$ rule is also summarized. This story is dedicated to Jean-Marc Gerard on the occasion of the 35th anniversary of our collaboration and his 64th birthday.","PeriodicalId":7060,"journal":{"name":"Acta Physica Polonica B","volume":"52 1","pages":"7"},"PeriodicalIF":0.5,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45237688","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: 1
Quantum Fluctuations of Energy in Subsystems of a Hot Relativistic Gas 热相对论气体子系统中能量的量子涨落
IF 0.5 4区 物理与天体物理
Acta Physica Polonica B Pub Date : 2020-12-10 DOI: 10.5506/APhysPolB.52.1395
Arpan Das, W. Florkowski, R. Ryblewski, Rajeev Singh
{"title":"Quantum Fluctuations of Energy in Subsystems of a Hot Relativistic Gas","authors":"Arpan Das, W. Florkowski, R. Ryblewski, Rajeev Singh","doi":"10.5506/APhysPolB.52.1395","DOIUrl":"https://doi.org/10.5506/APhysPolB.52.1395","url":null,"abstract":"We derive a formula that defines quantum fluctuations of energy in subsystems of a hot relativistic gas. For small subsystem sizes we find substantial increase of fluctuations compared to those known from standard thermodynamic considerations. However, if the size of the subsystem is sufficiently large, we reproduce the result for energy fluctuations in the canonical ensemble. Our results are subsequently used in the context of relativistic heavy-ion collisions to introduce limitations of the concepts such as classical energy density or fluid element. In the straightforward way, our formula can be applied in other fields of physics, wherever one deals with hot and relativistic matter.","PeriodicalId":7060,"journal":{"name":"Acta Physica Polonica B","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2020-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41789434","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: 5
Calculation of the One-loop Box Integral at Finite Temperature and Density 有限温度和密度下单回路盒积分的计算
IF 0.5 4区 物理与天体物理
Acta Physica Polonica B Pub Date : 2020-11-30 DOI: 10.5506/APhysPolB.52.1303
A. Khvorostukhin
{"title":"Calculation of the One-loop Box Integral at Finite Temperature and Density","authors":"A. Khvorostukhin","doi":"10.5506/APhysPolB.52.1303","DOIUrl":"https://doi.org/10.5506/APhysPolB.52.1303","url":null,"abstract":"Calculation of hadronization, decay or scattering processes at non-zero temperatures and densities within the Nambu-Jona-Lasinio-like models requires some techniques for computation of Feynmann diagrams. Decomposition of Feynman diagrams at the one loop level leads to the appearance of elementary integrals with one, two, three, and four fermion lines. For example, evaluation of the $pipi$ scattering amplitude requires calculating a box diagram with four fermion lines. In this work, the real and imaginary parts of the box integral at the one loop level are provided in the form suitable for numerical evaluation. The obtained expressions are applicable to any value of temperature, particle mass, particle momentum, and chemical potential. Among the expressions for the box integral, the general formulas for the integral with an arbitrary number of lines were derived for the case with zero or collinear fermion momenta.","PeriodicalId":7060,"journal":{"name":"Acta Physica Polonica B","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2020-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44498554","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: 1
Bounds on Planck-scale Deformations of CPT from Lifetimes and Interference CPT普朗克尺度变形的寿命和干涉边界
IF 0.5 4区 物理与天体物理
Acta Physica Polonica B Pub Date : 2020-10-27 DOI: 10.5506/APhysPolB.51.135
Wojciech Wiślicki
{"title":"Bounds on Planck-scale Deformations of CPT from Lifetimes and Interference","authors":"Wojciech Wiślicki","doi":"10.5506/APhysPolB.51.135","DOIUrl":"https://doi.org/10.5506/APhysPolB.51.135","url":null,"abstract":"Deformed relativistic kinematics, expected to emerge in a flat-spacetime limit of quantum gravity, predicts the Planck-scale violation of discrete symmeries. Momentum-dependent deformations of CPT are derived from the κ-deformed Poincaré algebra. Deformation of CPT symmetry leads to a subtle violation of Lorentz symmetry. This entails small but measurable phenomenological consequences as corrections to characteristics of time evolution: particle lifetimes or oscillations in two-particle states at high energy. We argue that using current experimental precisions on the muon lifetime, one can bound κ > 10 GeV at the LHC energy and move this limit to 10 GeV at the Future Circular Collider. Weaker limits on deformation can be also obtained from interference of neutral mesons. In the case of Bs from Υ decay, it amounts to κ > 10 GeV at confidence level 99%.","PeriodicalId":7060,"journal":{"name":"Acta Physica Polonica B","volume":"51 1","pages":"135"},"PeriodicalIF":0.5,"publicationDate":"2020-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41809391","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
A Superspace Dirac Operator in NCG and the “Factorization” of the Ordinary Dirac Operator NCG中的超空间Dirac算子与普通Dirac算子的“因子分解”
IF 0.5 4区 物理与天体物理
Acta Physica Polonica B Pub Date : 2020-09-28 DOI: 10.5506/APhysPolB.52.1449
D. Ciurla, L. Hadasz, T. Williams
{"title":"A Superspace Dirac Operator in NCG and the “Factorization” of the Ordinary Dirac Operator","authors":"D. Ciurla, L. Hadasz, T. Williams","doi":"10.5506/APhysPolB.52.1449","DOIUrl":"https://doi.org/10.5506/APhysPolB.52.1449","url":null,"abstract":"We review a procedure of factorizing the Minkowski space Dirac operator over a~suitable superspace, discuss its Euclidean space version and apply the worked out formalism in the case od an almost-commutative Dirac operator. The presented framework is an attempt to reconcile non-commutative geometry and supersymmetry.","PeriodicalId":7060,"journal":{"name":"Acta Physica Polonica B","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2020-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45771156","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
Revisiting Weak Radiative Decays of Hyperons 对Hyperon弱辐射衰变的再认识
IF 0.5 4区 物理与天体物理
Acta Physica Polonica B Pub Date : 2020-09-26 DOI: 10.5506/aphyspolb.51.2111
P. Żenczykowski
{"title":"Revisiting Weak Radiative Decays of Hyperons","authors":"P. Żenczykowski","doi":"10.5506/aphyspolb.51.2111","DOIUrl":"https://doi.org/10.5506/aphyspolb.51.2111","url":null,"abstract":"Triggered by experimentally driven renewed interest in hyperon properties we address the subject of weak radiative hyperon decays (WRHD). We start with the issue of Hara's theorem and briefly discuss the question of its possible evasion. Then, we give a short review of the story of vector-meson-dominance (VMD) approach to WRHD. We stress the shift from the Hara's-theorem-violating to Hara's-theorem-satisfying version of the VMD approach that did occur over time. Finally, spurred by a recent theoretical paper, we discuss the pole model description of WRHD, putting special attention to the issue of the contributions from the intermediate $Lambda(1405)$ state. We point out that the measurement of the $Lambda to n gamma$ decay asymmetry could resolve the encountered ambiguities and definitely answer the question of whether Hara's theorem is violated or not.","PeriodicalId":7060,"journal":{"name":"Acta Physica Polonica B","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2020-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41594233","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
CREDO Project 我认为项目
IF 0.5 4区 物理与天体物理
Acta Physica Polonica B Pub Date : 2020-09-25 DOI: 10.5506/APhysPolB.50.2001
R. Kami'nski, T. Wibig, D. A. Castillo, K. A. Cheminant, A. Ćwikła, A. Duffy, D. G'ora, P. Homola, P. Jagoda, M. Kasztelan, M. Knap, K. Kopa'nski, P. Kovács, M. Krupi'nski, M. Magry's, V. Nazari, M. Nied'zwiecki, W. Noga, Matías Rosas, Szymon Ryszkowski, K. Smelcerz, K. Smolek, J. Stasielak, S. Stuglik, M. Sułek, O. Sushchov, K. Wo'zniak
{"title":"CREDO Project","authors":"R. Kami'nski, T. Wibig, D. A. Castillo, K. A. Cheminant, A. Ćwikła, A. Duffy, D. G'ora, P. Homola, P. Jagoda, M. Kasztelan, M. Knap, K. Kopa'nski, P. Kovács, M. Krupi'nski, M. Magry's, V. Nazari, M. Nied'zwiecki, W. Noga, Matías Rosas, Szymon Ryszkowski, K. Smelcerz, K. Smolek, J. Stasielak, S. Stuglik, M. Sułek, O. Sushchov, K. Wo'zniak","doi":"10.5506/APhysPolB.50.2001","DOIUrl":"https://doi.org/10.5506/APhysPolB.50.2001","url":null,"abstract":"The Cosmic-Ray Extremely Distributed Observatory (CREDO) is a project created a few years ago in the Institute of Nuclear Physics PAS in Krak'ow and dedicated is to global studies of extremely extended cosmic-ray phenomena. The main reason for creating such a project was that the cosmic-ray ensembles (CRE) are beyond the capabilities of existing detectors and observatories. Until now, cosmic ray studies, even in major observatories, have been limited to the recording and analysis of individual air showers therefore ensembles of cosmic-rays, which may spread over a significant fraction of the Earth were neither recorded nor analyzed. In this paper the status and perspectives of the CREDO project are presented.","PeriodicalId":7060,"journal":{"name":"Acta Physica Polonica B","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2020-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47565028","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
On the Calculation of Invariant Tensors in Gauge Theories 规范理论中不变张量的计算
IF 0.5 4区 物理与天体物理
Acta Physica Polonica B Pub Date : 2020-09-14 DOI: 10.5506/aphyspolb.54.5-a2
Yahya Almumin, J. Baretz, A. Rajaraman
{"title":"On the Calculation of Invariant Tensors in Gauge Theories","authors":"Yahya Almumin, J. Baretz, A. Rajaraman","doi":"10.5506/aphyspolb.54.5-a2","DOIUrl":"https://doi.org/10.5506/aphyspolb.54.5-a2","url":null,"abstract":"We present an efficient method for finding the independent invariant tensors of a gauge theory. Our method uses a theorem relating invariant tensors and D-flat directions in field space. We apply our method to several examples-- SO(3) with symmetric tensors, SU(2) with a dimension 4 representation, and SU(3) with matter in the sextet-- and find the set of independent invariant tensors in these theories.","PeriodicalId":7060,"journal":{"name":"Acta Physica Polonica B","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49333782","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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