arXiv - PHYS - High Energy Physics - Lattice最新文献_第7页

Staggered fermions 交错费米子

arXiv - PHYS - High Energy Physics - Lattice Pub Date : 2024-06-05 DOI: arxiv-2406.02906

Maarten Golterman

引用次数: 0

Quark orbital angular momentum in the proton from a twist-3 generalized parton distribution 从扭转-3广义粒子分布看质子中的夸克轨道角动量

arXiv - PHYS - High Energy Physics - Lattice Pub Date : 2024-06-02 DOI: arxiv-2406.00845

M. Engelhardt, N. Hasan, S. Krieg, S. Liuti, S. Meinel, J. Negele, A. Pochinsky, M. Rodekamp, S. Syritsyn

{"title":"Quark orbital angular momentum in the proton from a twist-3 generalized parton distribution","authors":"M. Engelhardt, N. Hasan, S. Krieg, S. Liuti, S. Meinel, J. Negele, A. Pochinsky, M. Rodekamp, S. Syritsyn","doi":"arxiv-2406.00845","DOIUrl":"https://doi.org/arxiv-2406.00845","url":null,"abstract":"Quark orbital angular momentum in the proton is evaluated via a Lattice QCD\u0000calculation of the second Mellin moment of the twist-3 generalized parton\u0000distribution $widetilde{E}_{2T} $ in the forward limit. The connection between\u0000this approach to quark orbital angular momentum and approaches previously\u0000utilized in Lattice QCD calculations, via generalized transverse\u0000momentum-dependent parton distributions and via Ji's sum rule, is reviewed.\u0000This connection can be given in terms of Lorentz invariance and equation of\u0000motion relations. The calculation of the second Mellin moment of\u0000$widetilde{E}_{2T} $ proceeds via a finite-momentum proton matrix element of a\u0000quark bilocal operator with a straight-line gauge connection and separation in\u0000both the longitudinal and transverse directions. The dependence on the former\u0000component serves to extract the second Mellin moment, whereas the dependence on\u0000the latter component provides a transverse momentum cutoff for the matrix\u0000element. Furthermore, a derivative of the matrix element with respect to\u0000momentum transfer in the forward limit is required, which is obtained using a\u0000direct derivative method. The calculation utilizes a clover fermion ensemble at\u0000pion mass 317 MeV. The resulting quark orbital angular momentum is consistent\u0000with previous evaluations through alternative approaches, albeit with greater\u0000statistical uncertainty using a comparable number of samples.","PeriodicalId":501191,"journal":{"name":"arXiv - PHYS - High Energy Physics - Lattice","volume":"102 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141255303","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: 0

Testing dynamical stabilization of Complex Langevin simulations of QCD 测试 QCD 复杂朗文模拟的动态稳定性

arXiv - PHYS - High Energy Physics - Lattice Pub Date : 2024-05-31 DOI: arxiv-2405.20709

Michael W. Hansen, Dénes Sexty

引用次数: 0

Renormalization of nonlocal gluon operators on the lattice 晶格上非局部胶子算子的重正化

arXiv - PHYS - High Energy Physics - Lattice Pub Date : 2024-05-31 DOI: arxiv-2406.15446

Demetrianos Gavriel, Haralambos Panagopoulos, Gregoris Spanoudes

引用次数: 0

Progress on nucleon transition matrix elements with a lattice QCD variational analysis 利用格子 QCD 变分分析研究核子过渡矩阵元素的进展

arXiv - PHYS - High Energy Physics - Lattice Pub Date : 2024-05-31 DOI: arxiv-2405.20875

Lorenzo Barca, Gunnar Bali, Sara Collins

引用次数: 0

Neural Network Gauge Field Transformation for 4D SU(3) gauge fields 4D SU(3) 轨则场的神经网络轨则场变换

arXiv - PHYS - High Energy Physics - Lattice Pub Date : 2024-05-30 DOI: arxiv-2405.19692

Xiao-Yong Jin

引用次数: 0

Lattice QCD calculation of the pion distribution amplitude with domain wall fermions at physical pion mass 以物理先驱质量计算具有畴壁费米子的先驱分布振幅的格面 QCD 计算

arXiv - PHYS - High Energy Physics - Lattice Pub Date : 2024-05-30 DOI: arxiv-2405.20120

Ethan Baker, Dennis Bollweg, Peter Boyle, Ian Cloët, Xiang Gao, Swagato Mukherjee, Peter Petreczky, Rui Zhang, Yong Zhao

{"title":"Lattice QCD calculation of the pion distribution amplitude with domain wall fermions at physical pion mass","authors":"Ethan Baker, Dennis Bollweg, Peter Boyle, Ian Cloët, Xiang Gao, Swagato Mukherjee, Peter Petreczky, Rui Zhang, Yong Zhao","doi":"arxiv-2405.20120","DOIUrl":"https://doi.org/arxiv-2405.20120","url":null,"abstract":"We present a direct lattice QCD calculation of the $x$-dependence of the pion\u0000distribution amplitude (DA), which is performed using the quasi-DA in large\u0000momentum effective theory on a domain-wall fermion ensemble at physical quark\u0000masses and spacing $aapprox 0.084$ fm. The bare quais-DA matrix elements are\u0000renormalized in the hybrid scheme and matched to $overline{rm MS}$ with a\u0000subtraction of the leading renormalon in the Wilson-line mass. For the first\u0000time, we include threshold resummation in the perturbative matching onto the\u0000light-cone DA, which resums the large logarithms in the soft gluon limit at\u0000next-to-next-to-leading log. The resummed results show controlled\u0000scale-variation uncertainty within the range of momentum fraction\u0000$xin[0.25,0.75]$ at the largest pion momentum $P_zapprox 1.85$~GeV. In\u0000addition, we apply the same analysis to quasi-DAs from a\u0000highly-improved-staggered-quark ensemble at physical pion mass and $a=0.076$\u0000fm. By comparison we find with $2sigma$ confidence level that the DA obtained\u0000from chiral fermions is flatter and lower near $x=0.5$.","PeriodicalId":501191,"journal":{"name":"arXiv - PHYS - High Energy Physics - Lattice","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141189630","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: 0

Accelerating Lattice QCD Simulations using GPUs 利用 GPU 加速 Lattice QCD 模拟

arXiv - PHYS - High Energy Physics - Lattice Pub Date : 2024-05-29 DOI: arxiv-2407.00041

Tilmann Matthaei

{"title":"Accelerating Lattice QCD Simulations using GPUs","authors":"Tilmann Matthaei","doi":"arxiv-2407.00041","DOIUrl":"https://doi.org/arxiv-2407.00041","url":null,"abstract":"Solving discretized versions of the Dirac equation represents a large share\u0000of execution time in lattice Quantum Chromodynamics (QCD) simulations. Many\u0000high-performance computing (HPC) clusters use graphics processing units (GPUs)\u0000to offer more computational resources. Our solver program, DDalphaAMG,\u0000previously was unable to fully take advantage of GPUs to accelerate its\u0000computations. Making use of GPUs for DDalphaAMG is an ongoing development, and\u0000we will present some current progress herein. Through a detailed description of\u0000our development, this thesis should offer valuable insights into using GPUs to\u0000accelerate a memory-bound CPU implementation. We developed a storage scheme for multiple tuples, which allows much more\u0000efficient memory access on GPUs, given that the element at the same index is\u0000read from multiple tuples simultaneously. Still, our implementation of a\u0000discrete Dirac operator is memory-bound, and we only achieved improvements for\u0000large linear systems on few nodes at the JUWELS cluster. These improvements do\u0000not currently overcome additional introduced overheads. However, the results\u0000for the application of the Wilson-Dirac operator show a speedup of around 3 for\u0000large lattices. If the additional overheads can be eliminated in the future,\u0000GPUs could reduce the DDalphaAMG execution time significantly for large\u0000lattices. We also found that a previous publication on the GPU acceleration of\u0000DDalphaAMG, underrepresented the achieved speedup, because small lattices were\u0000used. This further highlights that GPUs often require large-scale problems to\u0000solve in order to be faster than CPUs","PeriodicalId":501191,"journal":{"name":"arXiv - PHYS - High Energy Physics - Lattice","volume":"133 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141521241","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: 0

Nucleon Helicity Parton Distribution Function in the Continuum Limit with Self-Renormalization 自重正化连续极限中的核子螺旋粒子分布函数

arXiv - PHYS - High Energy Physics - Lattice Pub Date : 2024-05-28 DOI: arxiv-2405.18238

Jack Holligan, Huey-Wen Lin

{"title":"Nucleon Helicity Parton Distribution Function in the Continuum Limit with Self-Renormalization","authors":"Jack Holligan, Huey-Wen Lin","doi":"arxiv-2405.18238","DOIUrl":"https://doi.org/arxiv-2405.18238","url":null,"abstract":"We present the first lattice calculation of the nucleon isovector helicity\u0000parton distribution function (PDF) in the framework of large-momentum effective\u0000theory (LaMET) that uses the hybrid scheme with self-renormalization. We use\u0000ensembles generated by the MILC collaboration at lattice spacings\u0000$a={0.1207,0.0888,0.0582}$ fm, with $N_f=2+1+1$ flavors of highly improved\u0000staggered quarks at sea pion mass of $M_{pi}approx 315$ MeV. We use\u0000clover-improved action for our valence quarks with nucleon boost momentum\u0000$P_zapprox 1.75$ GeV and high-statistics measurements for the LaMET matrix\u0000elements. We perform an extrapolation to the continuum limit and improve the\u0000handling of systematic errors using renormalization-group resummation (RGR) and\u0000leading-renormalon resummation (LRR). Our final nucleon helicity PDF is\u0000renormalized in the $overline{text{MS}}$ scheme at energy scale $mu=2.0$\u0000GeV. We compare our results with and without the two systematic improvements of\u0000RGR and LRR at each lattice spacing as well as the continuum limit, and we see\u0000that the application of RGR and LRR greatly reduces the systematic errors\u0000across the whole $x$ range. Our continuum results with both RGR and LRR show a\u0000small positive antiquark region for the nucleon helicity PDF as well as a\u0000change of as much as a factor of two in the central values compared to results\u0000with neither RGR or LRR. By contrast, the application of RGR and LRR only\u0000changes the central values by about 5% in the quark region. We compare our\u0000lattice results with the global fits by the JAM, NNPDF and DSSV collaborations,\u0000and we observe some tension between our results.","PeriodicalId":501191,"journal":{"name":"arXiv - PHYS - High Energy Physics - Lattice","volume":"97 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141170413","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: 0

Gribov copies in the quark propagator 夸克传播子中的格里波夫副本

arXiv - PHYS - High Energy Physics - Lattice Pub Date : 2024-05-27 DOI: arxiv-2405.17301

Gerhard Kalusche, Dale Lawlor, Jon-Ivar Skullerud

引用次数: 0