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Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019)最新文献

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Static force from the lattice 来自晶格的静力
Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019) Pub Date : 2019-11-08 DOI: 10.22323/1.363.0109
N. Brambilla, V. Leino, O. Philipsen, Christian Reisinger, A. Vairo, M. Wagner
{"title":"Static force from the lattice","authors":"N. Brambilla, V. Leino, O. Philipsen, Christian Reisinger, A. Vairo, M. Wagner","doi":"10.22323/1.363.0109","DOIUrl":"https://doi.org/10.22323/1.363.0109","url":null,"abstract":"We present a novel approach to compute the force between a static quark and a static antiquark from lattice gauge theory directly, rather than extracting it from the static energy. We explore this approach for SU(3) pure gauge theory using the multilevel algorithm and smeared operators.","PeriodicalId":147987,"journal":{"name":"Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133450006","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
Full $mathcal{O}(a)$ improvement in EQCD 完整的$mathcal{O}(a)$改进EQCD
Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019) Pub Date : 2019-11-06 DOI: 10.22323/1.363.0197
G. Moore, Niels Schlusser
{"title":"Full $mathcal{O}(a)$ improvement in EQCD","authors":"G. Moore, Niels Schlusser","doi":"10.22323/1.363.0197","DOIUrl":"https://doi.org/10.22323/1.363.0197","url":null,"abstract":"EQCD is a 3D bosonic theory containing SU(3) and an adjoint scalar, which efficiently describes the infrared, nonperturbative sector of hot QCD and which is highly amenable to lattice study. We improve the matching between lattice and continuum EQCD by determining the final unknown coefficient in the $mathcal{O}(a)$ matching, an additive scalar mass renormalization. We do this numerically by using the symmetry-breaking phase transition line of EQCD as a line of constant physics. This prepares the ground for a precision study of the transverse momentum diffusion coefficient $C(q_perp)$ within this theory.","PeriodicalId":147987,"journal":{"name":"Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123539320","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
Three particles on the lattice 晶格上有三个粒子
Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019) Pub Date : 2019-11-04 DOI: 10.22323/1.363.0281
A. Rusetsky
{"title":"Three particles on the lattice","authors":"A. Rusetsky","doi":"10.22323/1.363.0281","DOIUrl":"https://doi.org/10.22323/1.363.0281","url":null,"abstract":"I give a review of existing frameworks, which are designed to analyse lattice data in the three-particle sector. A particular emphasis is laid on the foundations of the theory, where the separation of the short- and long-range effects plays a central role. It is shown that the use of the effective field theory approach enables one to carry out this separation in a natural and efficient way. In conclusion, a few examples of the analysis of lattice data are considered for illustration.","PeriodicalId":147987,"journal":{"name":"Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130675012","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: 21
Strange nucleon form factors and isoscalar charges with $N_f=2+1$ $mathcal{O}(a)$-improved Wilson fermions $N_f=2+1$ $mathcal{O}(a)$改进的威尔逊费米子奇异核子形式因子和等标量电荷
Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019) Pub Date : 2019-11-04 DOI: 10.22323/1.363.0158
D. Djukanovic, H. Meyer, K. Ottnad, G. Hippel, J. Wilhelm, H. Wittig
{"title":"Strange nucleon form factors and isoscalar charges with $N_f=2+1$ $mathcal{O}(a)$-improved Wilson fermions","authors":"D. Djukanovic, H. Meyer, K. Ottnad, G. Hippel, J. Wilhelm, H. Wittig","doi":"10.22323/1.363.0158","DOIUrl":"https://doi.org/10.22323/1.363.0158","url":null,"abstract":"We report on our calculation of the strange contribution to the vector and axial vector form factors. The strange charge radii, magnetic moment, and axial charge are extracted by model independent $z$-expansion fits to the $Q^2$-dependence of the respective form factors. Furthermore, the isoscalar contribution to the axial and tensor charge is investigated by combining the calculation of connected and disconnected diagrams. The required renormalization is performed with the Rome-Southampton method. We make use of the CLS $N_f=2+1$ $mathcal{O}(a)$-improved Wilson fermion ensembles. Results are reported for pion masses in the range $m_pi=200-360,text{MeV}$ and lattice spacings $a=0.05-0.086,text{fm}$.","PeriodicalId":147987,"journal":{"name":"Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130293418","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
Resonance study of SU(2) model with 2 fundamental flavours of fermions. 两种基本费米子SU(2)模型的共振研究。
Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019) Pub Date : 2019-10-30 DOI: 10.22323/1.363.0123
T. Janowski, V. Drach, S. Prelovsek
{"title":"Resonance study of SU(2) model with 2 fundamental flavours of fermions.","authors":"T. Janowski, V. Drach, S. Prelovsek","doi":"10.22323/1.363.0123","DOIUrl":"https://doi.org/10.22323/1.363.0123","url":null,"abstract":"Composite Higgs models are promising candidate models to address the long-standing naturalness problem in the Standard Model. Among them, the most minimal one is the SU(2) with 2 flavours of fermions in the fundamental representation of the gauge group. An important prediction in these models is the existence of resonance spectrum in vector boson scattering. Here we study the lowest such resonance, which is the equivalent of rho resonance in QCD. We describe the scan of the parameter space using the clover-improved Wilson fermions with Symanzik improved gauge action and then show the first results for the mass and width of the rho resonance in this model.","PeriodicalId":147987,"journal":{"name":"Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019)","volume":"23 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126245463","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: 3
Quasi-PDFs with twisted mass fermions 具有扭曲质量费米子的准pdf
Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019) Pub Date : 2019-10-29 DOI: 10.22323/1.363.0036
C. Alexandrou, K. Cichy, M. Constantinou, K. Hadjiyiannakou, K. Jansen, Aurora Scapellato, F. Steffens
{"title":"Quasi-PDFs with twisted mass fermions","authors":"C. Alexandrou, K. Cichy, M. Constantinou, K. Hadjiyiannakou, K. Jansen, Aurora Scapellato, F. Steffens","doi":"10.22323/1.363.0036","DOIUrl":"https://doi.org/10.22323/1.363.0036","url":null,"abstract":"We discuss the recent progress in extracting partonic functions from the quasi-distribution approach, using twisted mass fermions. This concerns, among others, the investigation of several sources of systematic effects. Their careful analysis is a prerequisite to obtain precise determinations of PDFs from the lattice with realistic estimates of all uncertainties. In these proceedings, we shortly discuss systematic effects in the matching procedure. Moreover, we present preliminary results from our new simulations at the physical point. They involve, additionally, the dynamical strange and charm quarks, as well as a larger volume and a smaller lattice spacing than in our previous computations. In addition, we show first results from computations of generalized parton distributions (GPDs) in the quasi-distribution framework.","PeriodicalId":147987,"journal":{"name":"Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126888647","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
Study of 2+1 flavor finite-temperature QCD using improved Wilson quarks at the physical point with the gradient flow 利用改进Wilson夸克在物理点梯度流动下研究2+1味有限温度QCD
Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019) Pub Date : 2019-10-28 DOI: 10.22323/1.363.0088
K. Kanaya, Atsushi Baba, A. Suzuki, S. Ejiri, M. Kitazawa, Hiroshi Suzuki, Y. Taniguchi, T. Umeda
{"title":"Study of 2+1 flavor finite-temperature QCD using improved Wilson quarks at the physical point with the gradient flow","authors":"K. Kanaya, Atsushi Baba, A. Suzuki, S. Ejiri, M. Kitazawa, Hiroshi Suzuki, Y. Taniguchi, T. Umeda","doi":"10.22323/1.363.0088","DOIUrl":"https://doi.org/10.22323/1.363.0088","url":null,"abstract":"We study thermodynamic properties of 2+1 flavor QCD applying the Small Flow-time eXpansion (SFtX) method based on the gradient flow. The method provides us with a general way to compute correctly renormalized observables irrespective of explicit violation of symmetries due to the regularization, such as the Poincare and chiral symmetries on the lattice. We report on the status of our on-going project to compute the energy-momentum tensor and the chiral condensate at the physical point with improved Wilson quarks, extending our previous study with slightly heavy u and d quarks. We also report on our test of two-loop matching coefficients recently calculated by Harlander et al., revisiting the case of QCD with slightly heavy u and d quarks. Our results suggest that the SFtX method is powerful in extracting physical observables on the lattice.","PeriodicalId":147987,"journal":{"name":"Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130216779","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
Exclusive Channel Study of the Muon HVP μ子HVP的独家通道研究
Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019) Pub Date : 2019-10-25 DOI: 10.22323/1.363.0239
M. Bruno, T. Izubuchi, C. Lehner, A. Meyer
{"title":"Exclusive Channel Study of the Muon HVP","authors":"M. Bruno, T. Izubuchi, C. Lehner, A. Meyer","doi":"10.22323/1.363.0239","DOIUrl":"https://doi.org/10.22323/1.363.0239","url":null,"abstract":"The Hadronic Vacuum Polarization (HVP) is a dominant contribution to the theoretical uncertainty of the muon anomalous magnetic moment. The uncertainty in a lattice QCD calculation of the connected light-quark contribution to the HVP is dominated by the long-distance region of the vector correlation function. Explicit studies of the exclusive channels of the HVP diagram make it possible to reconstruct the long-distance behavior of the correlation function. This removes most of the statistical uncertainty of the correlation function. In these proceedings, preliminary results of an exclusive study of the isospin symmetric connected-only vector-vector correlation function using a hybrid of distillation and A2A techniques are presented. The computation is performed on 2+1 flavor M\"obius Domain Wall Fermion ensembles with physical pion mass. Reconstruction of the long-distance correlation function will enable lattice-only calculations of the HVP to achieve precision similar to estimates of the HVP from the R-ratio method on the timescale of the new experimental measurements of the muon anomalous magnetic moment.","PeriodicalId":147987,"journal":{"name":"Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126522802","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: 9
Applying Complex Langevin to Lattice QCD at finite $mu$. 复朗格万在有限点阵QCD中的应用。
Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019) Pub Date : 2019-10-24 DOI: 10.22323/1.363.0245
D. Sinclair, J. Kogut
{"title":"Applying Complex Langevin to Lattice QCD at finite $mu$.","authors":"D. Sinclair, J. Kogut","doi":"10.22323/1.363.0245","DOIUrl":"https://doi.org/10.22323/1.363.0245","url":null,"abstract":"We continue our simulations of lattice QCD at finite quark-number chemical potential, $mu$, using the complex-Langevin equation (CLE) with gauge-cooling and adaptive updating. The CLE is used because QCD at finite finite $mu$ has a complex fermion determinant, which prevents use of standard simulation methods. Simulations using the standard lattice action show a transition from hadronic to nuclear matter for $mu < m_pi/2$ rather than the expected $mu approx m_N/3$. This suggests that the CLE is being influenced by the phase-quenched theory, which has a transition at $mu = m_pi/2$. We are therefore performing CLE simulations with a new action which includes an irrelevant chiral 4-fermion interaction. This separates the physics at energies of order of the pion mass and smaller from that at energies of the other hadrons. In doing this, it breaks the extended symmetry of the phase-quenched theory over that of the full theory, raising the masses of the extra pion-like excitations consisting of a quark and a conjugate quark, which could otherwise produce such an anomalous transition. Our preliminary CLE simulations using massless quarks, so that $m_pi=0$, show no transition at $mu=m_pi/2=0$, but do show a transition at an appreciably higher value of $mu$. It remains to be seen if this transition is near to $m_N/3$.","PeriodicalId":147987,"journal":{"name":"Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127658007","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
Fits of SU(3) $N_f=8$ data to dilaton-pion effective field theory SU(3) $N_f=8$数据与膨胀介子有效场理论的拟合
Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019) Pub Date : 2019-10-23 DOI: 10.22323/1.363.0130
M. Golterman, Y. Shamir
{"title":"Fits of SU(3) $N_f=8$ data to dilaton-pion effective field theory","authors":"M. Golterman, Y. Shamir","doi":"10.22323/1.363.0130","DOIUrl":"https://doi.org/10.22323/1.363.0130","url":null,"abstract":"We report on fits of the $SU(3)$ $N_f=8$ LSD spectral data to chiral perturbation theory with a dilatonic meson. These fits confirm that current simulations are in the \"large-mass\" regime, with approximate hyperscaling as the leading mass dependence. We find that the leading-order effective field theory describes the data well. In particular, the effective field theory allows us to understand the staggered taste splitting, explaining the pattern observed in the LSD data, which looks different from QCD.","PeriodicalId":147987,"journal":{"name":"Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121325039","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
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