检索结果-内蒙古大学图书馆

39th International Symposium on Lattice Field Theory, LATTICE 2022

作者： Alexandrou, C. Bacchio, S. Dimopoulos, P. Finkenrath, J. Frezzotti, R. Gagliardi, G. Garofalo, M. Hadjiyiannakou, K. Kostrzewa, B. Jansen, K. Lubicz, V. Petschlies, M. Sanfilippo, F. Simula, S. Urbach, C. Wenger, U. Department of Physics University of Cyprus Nicosia20537 Cyprus Computation-based Science and Technology Research Center The Cyprus Institute 20 Konstantinou Kavafi Street Nicosia2121 Cyprus Parma43124 Italy Dipartimento di Fisica INFN Università di Roma "Tor Vergata" Via della Ricerca Scientifica 1 RomaI-00133 Italy Institute for Theoretical Physics Albert Einstein Center for Fundamental Physics University of Bern Sidlerstrasse 5 BernCH-3012 Switzerland Istituto Nazionale di Fisica Nucleare Sezione di Roma Tre Via della Vasca Navale 84 RomeI-00146 Italy Rheinische Friedrich-Wilhelms-Universität Bonn Nussallee 14-16 Bonn53115 Germany High Performance Computing and Analytics Lab Rheinische Friedrich-Wilhelms-Universität Bonn Friedrich-Hirzebruch-Allee 8 Bonn53115 Germany NIC DESY Platanenallee 6 ZeuthenD-15738 Germany Dipartimento di Matematica e Fisica Università Roma Tre INFN Sezione di Roma Tre Via della Vasca Navale 84 RomeI-00146 Italy

We present a lattice determination of the disconnected contributions to the leading-order hadronic vacuum polarization (HVP) to the muon anomalous magnetic moment in the so-called short and intermediate time-distance windows. We employ gauge ensembles produced by the Extended Twisted Mass Collaboration (ETMC) with N f = 2 + 1 + 1 flavours of Wilson twisted-mass clover-improved quarks with masses approximately tuned to their physical value. We take the continuum limit employing three lattice spacings at about 0.08, 0.07 and 0.06 fm. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).

关键词： Magnetic moments

来源：评论

学校读者我要写书评

暂无评论

Lattice QCD results for the topological up-quark mass contribution: too small to rescue the mu = 0 solution to the strong CP problem 38

Lattice QCD results for the topological up-quark mass contri...

引用

38th International Symposium on Lattice Field Theory, LATTICE 2021

作者： Alexandrou, Constantia Finkenrath, Jacob Funcke, Lena Jansen, Karl Kostrzewa, Bartosz Pittler, Ferenc Urbach, Carsten Department of Physics University of Cyprus P.O. Box 20537 Nicosia1678 Cyprus Computation-Based Science and Technology Research Center The Cyprus Institute 20 Kavafi Street Nicosia2121 Cyprus Center for Theoretical Physics Co-Design Center for Quantum Advantage NSF AI Institute for Artificial Intelligence and Fundamental Interactions Massachusetts Institute of Technology 77 Massachusetts Avenue CambridgeMA02139 United States Perimeter Institute for Theoretical Physics 31 Caroline Street North WaterlooONN2L 2Y5 Canada Deutsches Elektronen-Synchrotron DESY Platanenallee 6 Zeuthen15738 Germany High Performance Computing & Analytics Lab University of Bonn Friedrich-Hirzebruch-Allee 8 Bonn53115 Germany Helmholtz Institut für Strahlen- und Kernphysik University of Bonn Nussallee 14-16 Bonn53115 Germany Bethe Center for Theoretical Physics University of Bonn Nussallee 12 Bonn53115 Germany

A vanishing Yukawa coupling of the up quark could in principle solve the strong CP problem. To render this solution consistent with current algebra results, the up quark must receive an alternative mass contribution that conserves CP symmetry. Such a contribution could be provided by QCD through non-perturbative topological effects, including instantons. In this talk, we present the first direct lattice computation of this topological mass contribution, using gauge configurations generated by the Extended Twisted Mass collaboration. We use the Iwasaki gauge action, Wilson twisted mass fermions at maximal twist, and dynamical up, down, strange and charm quarks. Our result for the topological mass contribution is an order of magnitude too small to account for the phenomenologically required up-quark mass. This rules out the "massless" up-quark solution to the strong CP problem, in accordance with previous results relying on XPT fits to lattice data. The talk is based on Ref. [1], where more details can be found. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0)

关键词： Gages

来源：评论

学校读者我要写书评

暂无评论

Weakly supervised learning for textbook question answering

TechRxiv

引用

TechRxiv 2021年

作者： Ma, Jie Chai, Qi Huang, Jingyue Liu, Jun You, Yang Zheng, Qinghua National Engineering Lab for Big Data Analytics School of Computer Science and Technology Xi’an Jiaotong University Shaanxi Xi’an710049 China Shaanxi Province Key Laboratory of Satellite and Terrestrial Network Tech. R&D School of Computer Science and Technology Xi’an Jiaotong University Shaanxi Xi’an710049 China The High Performance Computing for Artificial intelligence Lab Department of Computer Science National University of Singapore 117417 Singapore

Textbook Question Answering (TQA) is the task of answering diagram and non-diagram questions given large multimodal contexts consisting of abundant text and diagrams. Deep text understandings and effective learning of diagram semantics are important for this task due to its specificity. In this paper, we propose a Weakly Supervised learning method for TQA (WSTQ), which regards the incompletely accurate results of essential intermediate procedures for this task as supervision to develop Text Matching (TM) and Relation Detection (RD) tasks and then employs the tasks to motivate itself to learn strong text comprehension and excellent diagram semantics respectively. Specifically, we apply the result of text retrieval to build positive as well as negative text pairs. In order to learn deep text understandings, we first pre-train the text understanding module of WSTQ on TM and then fine-tune it on TQA. We build positive as well as negative relation pairs by checking whether there is any overlap between the items/regions detected from diagrams using object detection. The RD task forces our method to learn the relationships between regions, which are crucial to express the diagram semantics. We train WSTQ on RD and TQA simultaneously, i.e., multitask learning, to obtain effective diagram semantics and then improve the TQA performance. Extensive experiments are carried out on CK12-QA and AI2D to verify the effectiveness of WSTQ. Experimental results show that our method achieves significant accuracy improvements of 5.02% and 4.12% on test splits of the above datasets respectively than the current state-of-the-art baseline. We have released our code on https://***/dr-majie/WSTQ. © 2021, CC BY.

关键词： Semantics

来源：评论

学校读者我要写书评

暂无评论

The η → γ∗γ∗ transition form factor and the hadronic light-by-light η-pole contribution to the muon g-2 from lattice QCD

arXiv

引用

arXiv 2022年

作者： Alexandrou, Constantia Bacchio, Simone Burri, Sebastian Finkenrath, Jacob Gasbarro, Andrew Hadjiyiannakou, Kyriakos Jansen, Karl Kanwar, Gurtej Kostrzewa, Bartosz Ottnad, Konstantin Petschlies, Marcus Pittler, Ferenc Urbach, Carsten Wenger, Urs Department of Physics University of Cyprus Nicosia Cyprus Computation-based Science and Technology Research Center The Cyprus Institute Nicosia Cyprus Albert Einstein Center Institute for Theoretical Physics University of Bern Switzerland NIC DESY Zeuthen Germany High Performance Computing and Analytics Lab Rheinische Friedrich-Wilhelms-Universität Bonn Germany PRISMA+ Cluster of Excellence Institut für Kernphysik Johannes Gutenberg-Universität Mainz Germany Helmholtz-Institut für Strahlen- und Kernphysik University of Bonn Germany Bethe Center for Theoretical Physics University of Bonn Germany

We calculate the double-virtual η → γ∗γ∗ transition form factor Fη→γ∗γ∗(q12, q22) from first principles using a lattice QCD simulation with Nf = 2+1+1 quark flavors at the physical pion mass and at one lattice spacing and volume. The kinematic range covered by our calculation is complementary to the one accessible from experiment and is relevant for the η-pole contribution to the hadronic light-by-light scattering in the anomalous magnetic moment aµ = (g − 2)/2 of the muon. From the form factor calculation we extract the partial decay width Γ(η → γγ) = 338(87)stat(17)syst eV and the slope parameter bη = 1.34(28)stat(14)syst GeV−2. For the η-pole contribution to aµ we obtain aηµ-pole = 13.8(5.2)stat(1.5)syst · 10−11 Copyright © 2022, The Authors. All rights reserved.

关键词： Light scattering

来源：评论

学校读者我要写书评

暂无评论

Lattice gauge ensembles and data management

Lattice gauge ensembles and data management

引用

39th International Symposium on Lattice Field Theory, LATTICE 2022

作者： Bali, Gunnar Bignell, Ryan Francis, Anthony Gottlieb, Steven Gupta, Rajan Kanamori, Issaku Kostrzewa, Bartosz Kotov, Andrey Yu. Kuramashi, Yoshinobu Mawhinney, Robert Schmidt, Christian Söldner, Wolfgang Sun, Peng Institut für Theoretische Physik Universität Regensburg Universitätsstr. 31 Regensburg93053 Germany Department of Physics Swansea University SwanseaSA2 8PP United Kingdom Institute of Physics National Yang Ming Chiao Tung University Hsinchu30010 Taiwan Department of Physics Indiana University BloomingtonIN47405 United States Los Alamos National Laboratory Theoretical Division T-2 Los AlamosNM87545 United States 7-1-26 Minatojima Minamimachi Kobe650-0047 Japan High Performance Computing and Analytics Lab Rheinische Friedrich-Wilhelms-Universität Bonn Friedrich-Hirzebruch-Allee 8 Bonn53115 Germany Forschungszentrum Jülich Jülich52428 Germany Center for Computational Sciences University of Tsukuba Tsukuba305-8577 Japan Physics Department Columbia University New YorkNY10027 United States Fakultät für Physik Universität Bielefeld Universitätsstr. 25 Bielefeld33615 Germany Institute of Modern Physics Chinese Academy of Sciences Lanzhou730000 China University of Chinese Academy of Sciences Beijing100049 China

The generation of ensembles of gauge configurations is a considerable expense. The preservation and curation of these ensembles constitutes a valuable shared resource for the lattice field theory community. The organizers of Lattice 2022 dedicated a parallel session to the presentation of gauge ensembles and their generation, plans for ensemble publication and data management/storage activities of different collaborations. A summary of the twelve contributions is presented here. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).

关键词： Information management

来源：评论

学校读者我要写书评

暂无评论

Pion-pole contribution to HLbL from twisted mass lattice QCD at the physical point 38

Pion-pole contribution to HLbL from twisted mass lattice QCD...

引用

38th International Symposium on Lattice Field Theory, LATTICE 2021

作者： Burri, S. Alexandrou, C. Bacchio, S. Bergner, G. Finkenrath, J. Gasbarro, A. Hadjiyiannakou, K. Jansen, K. Kostrzewa, B. Koutsou, G. Ottnad, K. Petschlies, M. Pittler, F. Steffen, F. Urbach, C. Wenger, U. Albert Einstein Center for Fundamental Physics Institute for Theoretical Physics University of Bern Sidlerstrasse 5 BernCH-3012 Switzerland Department of Physics University of Cyprus Nicosia20537 Cyprus Computation-based Science and Technology Research Center The Cyprus Institute 20 Konstantinou Kavafi Street Nicosia2121 Cyprus University of Jena Institute for Theoretical Physics Max-Wien-Platz 1 JenaD-07743 Germany Deutsches Elektronen-Synchrotron DESY Platanenallee 6 Zeuthen15738 Germany High Performance Computing and Analytics Lab Rheinische Friedrich-Wilhelms-Universität Bonn Friedrich-Hirzebruch-Allee 8 BonnD-53115 Germany PRISMA+ Cluster of Excellence Institut für Kernphysik Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 MainzD-55128 Germany Rheinische Friedrich-Wilhelms-Universität Bonn Nussallee 14-16 BonnD-53115 Germany Bethe Center for Theoretical Physics Rheinische Friedrich-Wilhelms-Universität Bonn Wegelerstraße 10 BonnD-53115 Germany

We report on our computation of the pion transition form factor Fπ→γ∗γ∗ from twisted mass lattice QCD in order to determine the numerically dominant light pseudoscalar pole contribution in the hadronic light-by-light scattering contribution to the anomalous magnetic moment of the muon aµ = (g − 2)µ. The pion transition form factor is computed directly at the physical point. We present first results for our estimate of the pion-pole contribution with kinematic setup for the pion at rest. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0)

关键词： Quantum theory

来源：评论

学校读者我要写书评

暂无评论

Short & intermediate distance HVP contributions to muon g-2: SM (lattice) prediction versus e+e- annihilation data 41

Short & intermediate distance HVP contributions to muon g-2:...

引用

41st International Conference on high Energy Physics, ICHEP 2022

作者： Alexandrou, C. Bacchio, S. Dimopoulos, P. Finkenrath, J. Frezzotti, R. Gagliardi, G. Garofalo, M. Hadjiyiannakou, K. Kostrzewa, B. Jansen, K. Lubicz, V. Petschlies, M. Sanfilippo, F. Simula, S. Urbach, C. Wenger, U. Department of Physics University of Cyprus Nicosia20537 Cyprus Computation-based Science and Technology Research Center The Cyprus Institute 20 Konstantinou Kavafi Street Nicosia2121 Cyprus Parma43124 Italy Dipartimento di Fisica Università di Roma "Tor Vergata" INFN Sezione di Roma Tor Vergata Via della Ricerca Scientifica 1 RomeI-00133 Italy Istituto Nazionale di Fisica Nucleare Sezione di Roma Tre Via della Vasca Navale 84 RomeI-00146 Italy Rheinische Friedrich-Wilhelms-Universität Bonn Nussallee 14-16 Bonn53115 Germany High Performance Computing and Analytics Lab Rheinische Friedrich-Wilhelms-Universität Bonn Friedrich-Hirzebruch-Allee 8 Bonn53115 Germany NIC DESY Platanenallee 6 ZeuthenD-15738 Germany Dipartimento di Matematica e Fisica Università Roma Tre Via della Vasca Navale 84 RomeI-00146 Italy Institute for Theoretical Physics Albert Einstein Center for Fundamental Physics University of Bern Sidlerstrasse 5 BernCH-3012 Switzerland

We present new lattice results of the ETM Collaboration, obtained from extensive simulations of lattice QCD with dynamical up, down, strange and charm quarks at physical mass values, different volumes and lattice spacings, concerning the SM prediction for the so-called intermediate window (W) and short-distance (SD) contributions to the leading order hadronic vacuum polarization (LO-HVP) term of the muon anomalous magnetic moment, aµ. Results for aµLO−HVP,W and aµLO−HVP,SD, besides representing a step forward to a complete lattice computation of aµLO−HVP and a useful benchmark among lattice groups, are compared here with their dispersive counterparts based on experimental data for e+e− into hadrons. The comparison confirms the tension in aµLO−HVP,W, already noted in 2020 by the BMW Collaboration, while showing no tension in aµLO−HVP,SD © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0)

关键词： Magnetic moments

来源：评论

学校读者我要写书评

暂无评论

Twisted mass gauge ensembles at physical values of the light, strange and charm quark masses 38

Twisted mass gauge ensembles at physical values of the light...

引用

38th International Symposium on Lattice Field Theory, LATTICE 2021

作者： Finkenrath, Jacob Alexandrou, Constantia Bacchio, Simone Constantinou, Martha Dimopoulos, Petros Frezzotti, Roberto Jansen, Karl Kostrzewa, Bartosz Koutsou, Giannis Rossi, Giancarlo Urbach, Carsten Wenger, Urs Computation-based Science and Technology Research Center The Cyprus Institute Nicosia 20 Constantinou Kavafi Str. Nicosia2121 Cyprus Department of Physics University of Cyprus P.O. Box 20537 Nicosia1678 Cyprus Temple University 1801 N Broad Str. PhiladelphiaPA19122 United States Dipartimento di Scienze Matematiche Fisiche e Informatiche Università di Parma INFN Gruppo Collegato di Parma Italy Dipartimento di Fisica Universita di Roma "Tor Vergata" INFN Sezione di Roma 2 Via della Ricerca Scientifica Rome00133 Italy NIC DESY Zeuthen Germany High Performance Computing and Analytics Lab Rheinische Friedrich-Wilhelms-Universität Bonn Friedrich-Hirzebruch- Allee 8 BonnD-53115 Germany Centro Fermi - Museo Storico della Fisica Centro Studi e Ricerche Enrico Fermi Compendio del Viminale Piazza del Viminiale 1 RomeI-00184 Italy Rheinische Friedrich-Wilhelms-Universität Bonn Bonn Germany Albert Einstein Center for Fundamental Physics Institute for Theoretical Physics University of Bern Sidlerstrasse 5 BernCH-3012 Switzerland

Lattice QCD simulations directly at physical masses of dynamical light, strange and charm quarks are highly desirable especially to remove systematic errors due to chiral extrapolations. However such simulations are still challenging. We discuss the adaption of efficient algorithms, like multigrid methods or higher order integrators, within the molecular dynamic steps of the Hybrid Monte Carlo algorithm, that are enabling simulations of a new set of gauge ensembles by the Extended Twisted Mass collaboration (ETMC). We present the status of the on-going ETMC simulation effort that aims to enabling studies of finite size and discretization effects. We work within the twisted mass discretization which is free of odd-discretization effects at maximal twist and present our tuning procedure. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0)

关键词： Molecular dynamics

来源：评论

学校读者我要写书评

暂无评论

Moments of the nucleon transverse quark spin densities using lattice QCD

引用

Physical Review D 2023年第5期107卷 054504-054504页

作者： C. Alexandrou S. Bacchio M. Constantinou P. Dimopoulos J. Finkenrath R. Frezzotti K. Hadjiyiannakou K. Jansen B. Kostrzewa G. Koutsou G. Spanoudes C. Urbach Department of Physics University of Cyprus P.O. Box 20537 1678 Nicosia Cyprus Computation-based Science and Technology Research Center The Cyprus Institute 20 Kavafi Street Nicosia 2121 Cyprus Department of Physics Temple University Philadelphia Pennsylvania 19122–1801 USA Dipartimento di Scienze Matematiche Fisiche e Informatiche Università di Parma and INFN Gruppo Collegato di Parma Parco Area delle Scienze 7/a (Campus) 43124 Parma Italy Dipartimento di Fisica and INFN Università di Roma “Tor Vergata” Via della Ricerca Scientifica 1 I-00133 Roma Italy Deutsches Elektronen-Synchrotron DESY Platanenallee 6 15738 Zeuthen Germany High Performance Computing and Analytics Lab Rheinische Friedrich-Wilhelms-Universität Bonn Friedrich-Hirzebruch-Allee 8 53115 Bonn Germany Bethe Center for Theoretical Physics Rheinische Friedrich-Wilhelms Universität Bonn 53115 Bonn Germany Helmholtz-Institut für Strahlen-und Kernphysik Rheinische Friedrich-Wilhelms Universität Bonn 53115 Bonn Germany

We present the first calculation of the Mellin moments of the transverse quark spin densities in the nucleon using lattice QCD simulations with physical values of the pion mass and in the continuum limit. Specifically, we use three Nf=2+1+1 twisted mass fermion gauge ensembles each at different lattice spacings. The densities are extracted from the unpolarized and transversity generalized form factors. The first moment of transversely polarized quarks in an unpolarized nucleon shows an interesting distortion, which can be traced back to the sharp falloff of the transversity generalized form factor B¯Tn0(Q2). The isovector tensor anomalous magnetic moment is determined to be κT=1.051(94), which confirms a negative and large Boer-Mulders function, h1⊥, in the nucleon.

关键词： Nucleon distribution Particle correlations & fluctuations

来源：评论

学校读者我要写书评

暂无评论

Gradient flow scale-setting with Nf = 2 + 1 + 1 Wilson-clover twisted-mass fermions 38

Gradient flow scale-setting with Nf = 2 + 1 + 1 Wilson-clove...

引用

38th International Symposium on Lattice Field Theory, LATTICE 2021

作者： Alexandrou, C. Bacchio, S. Bergner, G. Dimopoulos, P. Finkenrath, J. Frezzotti, R. Garofalo, M. Kostrzewa, B. Koutsou, G. labus, P. Sanfilippo, F. Simula, S. Ueding, M. Urbach, C. Wenger, U. Department of Physics University of Cyprus Nicosia20537 Cyprus Computation-Based Science and Technology Research Center The Cyprus Institute 20 Konstantinou Kavafi Street Nicosia2121 Cyprus University of Jena Institute for Theoretical Physics Max-Wien-Platz 1 JenaD-07743 Germany ParmaI-43124 Italy Dipartimento di Fisica Università di Roma "Tor Vergata" INFN Sezione di Tor Vergata Via della Ricerca Scientifica 1 RomaI-00133 Italy Rheinische Friedrich-Wilhelms-Universität Bonn Nussallee 14-16 BonnD-53115 Germany Dipartimento di Fisica Università Roma Tre INFN Sezione di Roma Tre Via della Vasca Navale 84 RomeI-00146 Italy High Performance Computing and Analytics Lab Rheinische Friedrich-Wilhelms-Universität Bonn Friedrich-Hirzebruch-Allee 8 BonnD-53115 Germany Fraunhofer-Platz 1 KaiserslauternD-67663 Germany Istituto Nazionale di Fisica Nucleare Sezione di Roma Tre Via della Vasca Navale 84 RomeI-00146 Italy Institute for Theoretical Physics Albert Einstein Center for Fundamental Physics University of Bern Sidlerstrasse 5 BernCH-3012 Switzerland

We present a determination of the gradient flow scales w0√t0 and t0/w0 in isosymmetric QCD, making use of the gauge ensembles produced by the Extended Twisted Mass Collaboration (ETMC) with N f = 2 + 1 + 1 flavours of Wilson-clover twisted-mass quarks including configurations close to the physical point for all dynamical flavours. The simulations are carried out at three values of the lattice spacing and the scale is set through the PDG value of the pion decay constant, yielding w0 = 0.17383(63) fm, √t0 = 0.14436(61) fm and t0/w0 = 0.11969(62) fm. Finally, fixing the kaon mass to its isosymmetric value, we determine the ratio of the kaon and pion leptonic decay constants to be fK/fπ = 1.1995(44). © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0)

关键词： Hadrons

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：