arXiv - PHYS - High Energy Physics - Lattice最新文献

The $η_c$-meson leading-twist distribution amplitude η_c$介子前旋分布振幅

arXiv - PHYS - High Energy Physics - Lattice Pub Date : 2024-09-18 DOI: arxiv-2409.12084

Benoît Blossier, Mariane Mangin-Brinet, José Manuel Morgado Chávez, Teseo San José

引用次数: 0

Bootstrap-determined p-values in Lattice QCD 点阵 QCD 中由引导法确定的 p 值

arXiv - PHYS - High Energy Physics - Lattice Pub Date : 2024-09-17 DOI: arxiv-2409.11379

Norman Christ, Rajiv Eranki, Christopher Kelly

{"title":"Bootstrap-determined p-values in Lattice QCD","authors":"Norman Christ, Rajiv Eranki, Christopher Kelly","doi":"arxiv-2409.11379","DOIUrl":"https://doi.org/arxiv-2409.11379","url":null,"abstract":"We present a general method to determine the probability that stochastic\u0000Monte Carlo data, in particular those generated in a lattice QCD calculation,\u0000would have been obtained were that data drawn from the distribution predicted\u0000by a given theoretical hypothesis. Such a probability, or p-value, is often\u0000used as an important heuristic measure of the validity of that hypothesis. The\u0000proposed method offers the benefit that it remains usable in cases where the\u0000standard Hotelling $T^2$ methods based on the conventional $chi^2$ statistic\u0000do not apply, such as for uncorrelated fits. Specifically, we analyze a general\u0000alternative to the correlated $chi^2$ statistic referred to as $q^2$, and show\u0000how to use the bootstrap as a data-driven method to determine the expected\u0000distribution of $q^2$ for a given hypothesis with minimal assumptions. This\u0000distribution can then be used to determine the p-value for a fit to the data.\u0000We also describe a bootstrap approach for quantifying the impact upon this\u0000p-value of estimating population parameters from a single ensemble of $N$\u0000samples. The overall method is accurate up to a $1/N$ bias which we do not\u0000attempt to quantify.","PeriodicalId":501191,"journal":{"name":"arXiv - PHYS - High Energy Physics - Lattice","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142253743","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

Inverse Spin Hall Effect in Nonequilibrium Dirac Systems Induced by Anomalous Flow Imbalance 非平衡狄拉克系统中由反常流动不平衡诱发的逆自旋霍尔效应

arXiv - PHYS - High Energy Physics - Lattice Pub Date : 2024-09-13 DOI: arxiv-2409.09025

Hung-Hsuan Teh, Tokiro Numasawa, Shun Okumura, Takashi Oka

引用次数: 0

Supersymmetric QCD on the lattice: Fine-tuning and counterterms for the quartic couplings 晶格上的超对称 QCD：四元耦合的微调与反项

arXiv - PHYS - High Energy Physics - Lattice Pub Date : 2024-09-11 DOI: arxiv-2409.09089

Marios Costa, Herodotos Herodotou, Haralambos Panagopoulos

{"title":"Supersymmetric QCD on the lattice: Fine-tuning and counterterms for the quartic couplings","authors":"Marios Costa, Herodotos Herodotou, Haralambos Panagopoulos","doi":"arxiv-2409.09089","DOIUrl":"https://doi.org/arxiv-2409.09089","url":null,"abstract":"In this work we calculate the renormalization of counterterms which arise in\u0000the lattice action of $N = 1$ Supersymmetric QCD (SQCD). In particular, the\u0000fine-tunings for quartic couplings are studied in detail through both continuum\u0000and lattice perturbation theory at one-loop level. For the lattice version of\u0000SQCD we make use of the Wilson gauge action for gluon fields and the Wilson\u0000fermion action for fermion fields (quarks, gluinos); for squark fields we use\u0000na\"ive discretization. On the lattice, different components of squark fields\u0000mix among themselves and a total of ten quartic terms arise at the quantum\u0000level. Consequently, the renormalization conditions must take into account\u0000these effects in order to appropriately fine-tune all quartic couplings. All\u0000our results for Green's functions and renormalization factors exhibit an\u0000explicit analytic dependence on the number of colors, $N_c$, the number of\u0000flavors, $N_f$, and the gauge parameter, $alpha$, which are left unspecified.\u0000Results for the specific case $N_f=1$ are also presented, where the symmetries\u0000allow only five linearly independent quartic terms. For the calculation of the\u0000Green's functions, we consider both one-particle reducible and one-particle\u0000irreducible Feynman diagrams. Knowledge of these renormalization factors is\u0000necessary in order to relate numerical results, coming from nonperturbative\u0000studies, to ``physical'' observables.","PeriodicalId":501191,"journal":{"name":"arXiv - PHYS - High Energy Physics - Lattice","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142253745","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

Finite-size topological phases from semimetals 来自半金属的有限尺寸拓扑相

arXiv - PHYS - High Energy Physics - Lattice Pub Date : 2024-09-09 DOI: arxiv-2409.05842

Adipta Pal, Ashley M. Cook

{"title":"Finite-size topological phases from semimetals","authors":"Adipta Pal, Ashley M. Cook","doi":"arxiv-2409.05842","DOIUrl":"https://doi.org/arxiv-2409.05842","url":null,"abstract":"Topological semimetals are some of the topological phases of matter most\u0000intensely-studied experimentally. The Weyl semimetal phase, in particular, has\u0000garned tremendous, sustained interest given fascinating signatures such as the\u0000Fermi arc surface states and the chiral anomaly, as well as the minimal\u0000requirements to protect this three-dimensional topological phase. Here, we show\u0000that thin films of Weyl semimetals (which we call quasi-(3-1)-dimensional, or\u0000q(3-1)d) generically realize finite-size topological phases distinct from 3d\u0000and 2d topological phases of established classification schemes: response\u0000signatures of the 3d bulk topology co-exist with topologically-protected,\u0000quasi-(3-2)d Fermi arc states or chiral boundary modes due to a second,\u0000previously-unidentified bulk-boundary correspondence. We show these finite-size\u0000topological semimetal phases are realized by Hamiltonians capturing the\u0000Fermiology of few-layer Van der Waals material MoTe2 in experiment. Given the\u0000broad experimental interest in few-layer Van der Waals materials and\u0000topological semimetals, our work paves the way for extensive future theoretical\u0000and experimental characterization of finite-size topological phases.","PeriodicalId":501191,"journal":{"name":"arXiv - PHYS - High Energy Physics - Lattice","volume":"171 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142197881","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

Proper Wilson flow time for calculating the topological charge density and the pseudoscalar glueball mass in quenched lattice QCD 计算淬火格子 QCD 中拓扑电荷密度和伪星胶球质量的适当威尔逊流动时间

arXiv - PHYS - High Energy Physics - Lattice Pub Date : 2024-09-04 DOI: arxiv-2409.02756

Zhen Cheng, Guang-yi Xiong

引用次数: 0

Toward the First Gluon Parton Distribution from the LaMET 从 LaMET 实现首个胶子 Parton 分布

arXiv - PHYS - High Energy Physics - Lattice Pub Date : 2024-09-04 DOI: arxiv-2409.02750

William Good, Kinza Hasan, Huey-Wen Lin

{"title":"Toward the First Gluon Parton Distribution from the LaMET","authors":"William Good, Kinza Hasan, Huey-Wen Lin","doi":"arxiv-2409.02750","DOIUrl":"https://doi.org/arxiv-2409.02750","url":null,"abstract":"We present progress towards the first unpolarized gluon quasi-PDF from\u0000lattice QCD using high-statistics measurement with $a approx 0.12$ fm and two\u0000valence pion masses $M_pi approx 310$ and $690$ MeV generated on\u0000$2+1+1$-flavors of HISQ ensemble by the MILC collaboration. In this study, we\u0000consider two different gluon operators, for which the hybrid-ratio\u0000renormalization matching kernels have been recently derived, and a third\u0000operator that has been used in prior pseudo-PDF studies of the gluon PDFs. We\u0000compare matrix elements for each operators for both nucleon and pseudo-scalar\u0000mesons, both pion masses, and two gauge-smearing techniques. Focusing on the\u0000more phenomenologically studied nucleon gluon PDF, we compare the ratio and\u0000hybrid-ratio renormalized matrix elements at both pion masses and both\u0000smearings to those reconstructed from the nucleon gluon PDF from the CT18\u0000global analysis. We identify the best choice of operator to study the gluon PDF\u0000through LaMET and present the first gluon quasi-PDF under some caveats.\u0000Additionally, we explore the recent idea of Coulomb gauge fixing to improve\u0000signal at large Wilson line displacement and found it could be a major help in\u0000improving the signal of gluon matrix elements given the perturbative\u0000calculation to confirm our results. This work helps identify the best operator\u0000for studying the gluon quasi-PDF, shows higher hadron boost momentum is needed\u0000to implement hybrid-ratio renormalization reliably, and suggests the need to\u0000study more diverse set of operators with their corresponding perturbative\u0000calculations for hybrid-ratio renormalization to further gluon quasi-PDF study.","PeriodicalId":501191,"journal":{"name":"arXiv - PHYS - High Energy Physics - Lattice","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142197885","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

Curve collapse for the isospin-2 pion scattering length from QCD with 3, 4, and 5 colors 来自 QCD 的 3、4 和 5 种颜色的等时空-2 先驱散射长度的曲线坍缩

arXiv - PHYS - High Energy Physics - Lattice Pub Date : 2024-09-03 DOI: arxiv-2409.02242

Thomas DeGrand

引用次数: 0

The Nonabelian Plasma is Chaotic 非阿贝尔等离子体是混沌的

arXiv - PHYS - High Energy Physics - Lattice Pub Date : 2024-09-02 DOI: arxiv-2409.01311

Berndt Müller, Lukas Ebner, Andreas Schäfer, Clemens Seidl, Xiaojun Yao

引用次数: 0

The two-pion contribution to the hadronic vacuum polarization with staggered quarks 交错夸克对强子真空极化的双离子贡献

arXiv - PHYS - High Energy Physics - Lattice Pub Date : 2024-09-01 DOI: arxiv-2409.00756

Shaun Lahert, Carleton DeTar, Aida X. El-Khadra, Steven Gottlieb, Andreas S. Kronfeld, Ruth S. Van de Water

{"title":"The two-pion contribution to the hadronic vacuum polarization with staggered quarks","authors":"Shaun Lahert, Carleton DeTar, Aida X. El-Khadra, Steven Gottlieb, Andreas S. Kronfeld, Ruth S. Van de Water","doi":"arxiv-2409.00756","DOIUrl":"https://doi.org/arxiv-2409.00756","url":null,"abstract":"We present results from the first lattice QCD calculation of the two-pion\u0000contributions to the light-quark connected vector-current correlation function\u0000obtained from staggered-quark operators. We employ the MILC collaboration's\u0000gauge-field ensemble with $2+1+1$ flavors of highly improved staggered sea\u0000quarks at a lattice spacing of $aapprox 0.15$ fm with a light sea-quark mass\u0000at its physical value. The two-pion contributions allow for a refined\u0000determination of the noisy long-distance tail of the vector-current correlation\u0000function, which we use to compute the light-quark connected contribution to HVP\u0000with improved statistical precision. We compare our results with traditional\u0000noise-reduction techniques used in lattice QCD calculations of the light-quark\u0000connected HVP, namely the so-called fit and bounding methods. We observe a\u0000factor of roughly three improvement in the statistical precision in the\u0000determination of the HVP contribution to the muon's anomalous magnetic moment\u0000over these approaches. We also lay the group theoretical groundwork for\u0000extending this calculation to finer lattice spacings with increased numbers of\u0000staggered two-pion taste states.","PeriodicalId":501191,"journal":{"name":"arXiv - PHYS - High Energy Physics - Lattice","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142197888","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