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αs from the Hadronic Vacuum Polarisation αs从强子真空极化
arXiv: High Energy Physics - Lattice Pub Date : 2018-03-01 DOI: 10.1051/EPJCONF/201817510006
R. Hudspith, R. Lewis, K. Maltman, E. Shintani
{"title":"αs from the Hadronic Vacuum Polarisation","authors":"R. Hudspith, R. Lewis, K. Maltman, E. Shintani","doi":"10.1051/EPJCONF/201817510006","DOIUrl":"https://doi.org/10.1051/EPJCONF/201817510006","url":null,"abstract":"We present our result for the strong coupling constant computed from the u-d vector Hadronic Vacuum Polarisation function. We use nf = 2 + 1 flavours of Domain Wall fermions at 3 lattice spacings, generated by the RBC-UKQCD collaboration. We identify several possible pitfalls in this method for determining the coupling and illustrate how to resolve them.","PeriodicalId":8440,"journal":{"name":"arXiv: High Energy Physics - Lattice","volume":"136 1","pages":"10006"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76400193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Perturbative matching of continuum and lattice quasi-distributions 连续统与晶格拟分布的微扰匹配
arXiv: High Energy Physics - Lattice Pub Date : 2018-02-07 DOI: 10.1051/epjconf/201817506028
T. Ishikawa
{"title":"Perturbative matching of continuum and lattice quasi-distributions","authors":"T. Ishikawa","doi":"10.1051/epjconf/201817506028","DOIUrl":"https://doi.org/10.1051/epjconf/201817506028","url":null,"abstract":"Matching of the quasi parton distribution functions between continuum and lattice is addressed using lattice perturbation theory specifically with Wilson-type fermions. The matching is done for nonlocal quark bilinear operators with a straight Wilson line in a spatial direction. We also investigate operator mixing in the renormalization and possible O(a) operators for the nonlocal operators based on a symmetry argument on lattice.","PeriodicalId":8440,"journal":{"name":"arXiv: High Energy Physics - Lattice","volume":"100 1","pages":"06028"},"PeriodicalIF":0.0,"publicationDate":"2018-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81389620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Instanton dominance over αs at low momenta from lattice QCD simulations at Nf = 0, Nf = 2 + 1 and Nf = 2 + 1 + 1 在Nf = 0、Nf = 2 + 1和Nf = 2 + 1 + 1条件下晶格QCD模拟的低动量下瞬时子对αs的优势
arXiv: High Energy Physics - Lattice Pub Date : 2018-02-05 DOI: 10.1051/epjconf/201817512011
A. Athenodorou, P. Boucaud, F. Soto, J. Rodr'iguez-Quintero, S. Zafeiropoulos
{"title":"Instanton dominance over αs at low momenta from lattice QCD simulations at Nf = 0, Nf = 2 + 1 and Nf = 2 + 1 + 1","authors":"A. Athenodorou, P. Boucaud, F. Soto, J. Rodr'iguez-Quintero, S. Zafeiropoulos","doi":"10.1051/epjconf/201817512011","DOIUrl":"https://doi.org/10.1051/epjconf/201817512011","url":null,"abstract":"We report on an instanton-based analysis of the gluon Green functions in the Landau gauge for low momenta; in particular we use lattice results for αs in the symmetric momentum subtraction scheme (MOM) for large-volume lattice simulations. We have exploited quenched gauge field configurations, N f = 0, with both Wilson and tree-level Symanzik improved actions, and unquenched ones with N f = 2 + 1 and N f = 2 + 1 + 1 dynamical flavors (domain wall and twisted-mass fermions, respectively).We show that the dominance of instanton correlations on the low-momenta gluon Green functions can be applied to the determination of phenomenological parameters of the instanton liquid and, eventually, to a determination of the lattice spacing.We furthermore apply the Gradient Flow to remove short-distance fluctuations. The Gradient Flow gets rid of the QCD scale, ΛQCD , and reveals that the instanton prediction extents to large momenta. For those gauge field configurations free of quantum fluctuations, the direct study of topological charge density shows the appearance of large-scale lumps that can be identified as instantons, giving access to a direct study of the instanton density and size distribution that is compatible with those extracted from the analysis of the Green functions.","PeriodicalId":8440,"journal":{"name":"arXiv: High Energy Physics - Lattice","volume":"48 1","pages":"12011"},"PeriodicalIF":0.0,"publicationDate":"2018-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74002118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Automated lattice data generation 自动格子数据生成
arXiv: High Energy Physics - Lattice Pub Date : 2018-02-02 DOI: 10.1051/epjconf/201817509009
V. Ayyar, D. Hackett, W. Jay, E. Neil
{"title":"Automated lattice data generation","authors":"V. Ayyar, D. Hackett, W. Jay, E. Neil","doi":"10.1051/epjconf/201817509009","DOIUrl":"https://doi.org/10.1051/epjconf/201817509009","url":null,"abstract":"The process of generating ensembles of gauge configurations (and measuring various observables over them) can be tedious and error-prone when done \"by hand\". In practice, most of this procedure can be automated with the use of a workflow manager. We discuss how this automation can be accomplished using Taxi, a minimal Python-based workflow manager built for generating lattice data. We present a case study demonstrating this technology.","PeriodicalId":8440,"journal":{"name":"arXiv: High Energy Physics - Lattice","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73794123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Machine learning action parameters in lattice quantum chromodynamics 点阵量子色动力学中的机器学习动作参数
arXiv: High Energy Physics - Lattice Pub Date : 2018-01-17 DOI: 10.1103/PhysRevD.97.094506
P. Shanahan, D. Trewartha, W. Detmold
{"title":"Machine learning action parameters in lattice quantum chromodynamics","authors":"P. Shanahan, D. Trewartha, W. Detmold","doi":"10.1103/PhysRevD.97.094506","DOIUrl":"https://doi.org/10.1103/PhysRevD.97.094506","url":null,"abstract":"Numerical lattice quantum chromodynamics studies of the strong interaction are important in many aspects of particle and nuclear physics. Such studies require significant computing resources to undertake. A number of proposed methods promise improved efficiency of lattice calculations, and access to regions of parameter space that are currently computationally intractable, via multi-scale action-matching approaches that necessitate parametric regression of generated lattice datasets. The applicability of machine learning to this regression task is investigated, with deep neural networks found to provide an efficient solution even in cases where approaches such as principal component analysis fail. The high information content and complex symmetries inherent in lattice QCD datasets require custom neural network layers to be introduced and present opportunities for further development.","PeriodicalId":8440,"journal":{"name":"arXiv: High Energy Physics - Lattice","volume":"57 1","pages":"094506"},"PeriodicalIF":0.0,"publicationDate":"2018-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87581730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 56
The fate of $U_A(1)$ and topological features of QCD at finite temperature 有限温度下QCD $U_A(1)$的命运和拓扑特征
arXiv: High Energy Physics - Lattice Pub Date : 2018-01-16 DOI: 10.22323/1.311.0086
Sayantan Sharma
{"title":"The fate of $U_A(1)$ and topological features of QCD at finite temperature","authors":"Sayantan Sharma","doi":"10.22323/1.311.0086","DOIUrl":"https://doi.org/10.22323/1.311.0086","url":null,"abstract":"The nature of chiral phase transition for QCD with two light quark flavors is not yet completely resolved. This is primarily because one has to understand whether or not the anomalous U(1) symmetry in the flavor sector is effectively restored along with the chiral symmetry. Since the physics near the chiral phase transition is essentially non-perturbative, we employ first principles lattice techniques to address this issue. We use overlap fermions, which have exact chiral symmetry on the lattice, to probe the anomalous U(1) symmetry violation of 2+1 flavor dynamical QCD configurations with domain wall fermions. The latter also optimally preserves chiral and flavor symmetries on the lattice. We observe that the anomalous U(1) is not effectively restored in the chiral crossover region. We perform a systematic study of the finite size and cut-off effects since the signals of U(1) violation are sensitive to it. For the same reasons we also compare our results from the continuum extrapolated results of the QCD Dirac spectrum obtained from a different lattice discretization called Highly Improved Staggered Quarks. Our studies also provide a glimpse of the microscopic topological structures of the QCD medium that are responsible for the strongly interacting nature of the quark gluon plasma phase and related to the physics of confinement and chiral symmetry breaking.","PeriodicalId":8440,"journal":{"name":"arXiv: High Energy Physics - Lattice","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74990228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Portable multi-node LQCD Monte Carlo simulations using OpenACC 便携式多节点LQCD蒙特卡罗模拟使用OpenACC
arXiv: High Energy Physics - Lattice Pub Date : 2018-01-04 DOI: 10.1142/S0129183118500109
C. Bonati, E. Calore, M. D’Elia, M. Mesiti, F. Negro, F. Sanfilippo, S. Schifano, G. Silvi, R. Tripiccione
{"title":"Portable multi-node LQCD Monte Carlo simulations using OpenACC","authors":"C. Bonati, E. Calore, M. D’Elia, M. Mesiti, F. Negro, F. Sanfilippo, S. Schifano, G. Silvi, R. Tripiccione","doi":"10.1142/S0129183118500109","DOIUrl":"https://doi.org/10.1142/S0129183118500109","url":null,"abstract":"This paper describes a state-of-the-art parallel Lattice QCD Monte Carlo code for staggered fermions, purposely designed to be portable across different computer architectures, including GPUs and commodity CPUs. Portability is achieved using the OpenACC parallel programming model, used to develop a code that can be compiled for several processor architectures. The paper focuses on parallelization on multiple computing nodes using OpenACC to manage parallelism within the node, and OpenMPI to manage parallelism among the nodes. We first discuss the available strategies to be adopted to maximize performances, we then describe selected relevant details of the code, and finally measure the level of performance and scaling-performance that we are able to achieve. The work focuses mainly on GPUs, which offer a significantly high level of performances for this application, but also compares with results measured on other processors.","PeriodicalId":8440,"journal":{"name":"arXiv: High Energy Physics - Lattice","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78679757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
An analysis of the Lattice QCD spectra for $D^*_{s0}(2317)$ and $D^*_{s1}(2460)$ D^*_{s0}(2317)$和D^*_{s1}(2460)$晶格QCD谱的分析
arXiv: High Energy Physics - Lattice Pub Date : 2017-12-27 DOI: 10.22323/1.310.0024
Alberto Torres Martinez, E. O. Báguena, S. Prelovsek, Angels Ramos
{"title":"An analysis of the Lattice QCD spectra for $D^*_{s0}(2317)$ and $D^*_{s1}(2460)$","authors":"Alberto Torres Martinez, E. O. Báguena, S. Prelovsek, Angels Ramos","doi":"10.22323/1.310.0024","DOIUrl":"https://doi.org/10.22323/1.310.0024","url":null,"abstract":"In this talk I present the results obtained using effective field theories in a finite volume from a reanalysis of lattice data on the $KD^{(*)}$ systems, where bound states of $KD$ and $KD^*$ are found and associated with the states $D^*_{s0}(2317)$ and $D^*_{s1}(2460)$, respectively. We confirm the presence of such states on the lattice data and determine the weight of the $KD$ channel in the wave function of $D^*_{s0}(2317)$ and that of $KD^*$ in the wave function of $D^*_{s1}(2460)$. Our results indicate a large meson-meson component in both cases.","PeriodicalId":8440,"journal":{"name":"arXiv: High Energy Physics - Lattice","volume":"21 1","pages":"024"},"PeriodicalIF":0.0,"publicationDate":"2017-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90060153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Weak hamiltonian Wilson Coefficients from Lattice QCD 晶格QCD的弱哈密顿威尔逊系数
arXiv: High Energy Physics - Lattice Pub Date : 2017-12-26 DOI: 10.1051/epjconf/201817513014
M. Bruno
{"title":"Weak hamiltonian Wilson Coefficients from Lattice QCD","authors":"M. Bruno","doi":"10.1051/epjconf/201817513014","DOIUrl":"https://doi.org/10.1051/epjconf/201817513014","url":null,"abstract":"In this work we present a calculation of the Wilson Coefficients $C_1$ and $C_2$ of the Effective Weak Hamiltonian to all-orders in $alpha_s$, using lattice simulations. Given the current availability of lattice spacings we restrict our calculation to unphysically light $W$ bosons around 2 GeV and we study the systematic uncertainties of the two Wilson Coefficients.","PeriodicalId":8440,"journal":{"name":"arXiv: High Energy Physics - Lattice","volume":"8 1","pages":"13014"},"PeriodicalIF":0.0,"publicationDate":"2017-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81657733","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Neutron Electric Dipole Moment on the Lattice 晶格上的中子电偶极矩
arXiv: High Energy Physics - Lattice Pub Date : 2017-12-22 DOI: 10.1051/epjconf/201817501014
B. Yoon, Tanmoy Bhattacharya, Rajan Gupta
{"title":"Neutron Electric Dipole Moment on the Lattice","authors":"B. Yoon, Tanmoy Bhattacharya, Rajan Gupta","doi":"10.1051/epjconf/201817501014","DOIUrl":"https://doi.org/10.1051/epjconf/201817501014","url":null,"abstract":"For the neutron to have an electric dipole moment (EDM), the theory of nature must have T, or equivalently CP, violation. Neutron EDM is a very good probe of novel CP violation in beyond the standard model physics. To leverage the connection between measured neutron EDM and novel mechanism of CP violation, one requires the calculation of matrix elements for CP violating operators, for which lattice QCD provides a first principle method. In this paper, we review the status of recent lattice QCD calculations of the contributions of the QCD $Theta$-term, the quark EDM term, and the quark chromo-EDM term to the neutron EDM.","PeriodicalId":8440,"journal":{"name":"arXiv: High Energy Physics - Lattice","volume":"115 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79379153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
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