Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019)最新文献_第3页

Determining the glue component of the nucleon 确定核子的胶成分

Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019) Pub Date : 2020-01-17 DOI: 10.22323/1.363.0220

R. Horsley, T. Howson, W. Kamleh, Y. Nakamura, H. Perlt, P. Rakow, G. Schierholz, H. Stuben, R. Young, J. Zanotti

引用次数: 0

Prospects for large N gauge theories on the lattice 晶格上大N规范理论的展望

Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019) Pub Date : 2020-01-16 DOI: 10.22323/1.363.0276

M. G. Pérez

引用次数: 14

Lattice QCD package GWU-code and QUDA with HIP Lattice QCD包GWU-code和QUDA with HIP

Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019) Pub Date : 2020-01-16 DOI: 10.22323/1.363.0286

Yujiang Bi, Yi Xiao, Ming Gong, Weiyi Guo, P. Sun, Shun Xu, Yi-Bo Yang

引用次数: 9

Dirac Eigenvalue spectrum of $N_ f$ =2+1 QCD toward the chiral limit using HISQ fermions 利用HISQ费米子研究N_ f =2+1 QCD向手性极限的Dirac特征谱

Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019) Pub Date : 2020-01-15 DOI: 10.22323/1.363.0251

H. Ding, O. Kaczmarek, F. Karsch, Sheng-Tai Li, S. Mukherjee, A. Tomiya, Yu Zhang

{"title":"Dirac Eigenvalue spectrum of $N_ f$ =2+1 QCD toward the chiral limit using HISQ fermions","authors":"H. Ding, O. Kaczmarek, F. Karsch, Sheng-Tai Li, S. Mukherjee, A. Tomiya, Yu Zhang","doi":"10.22323/1.363.0251","DOIUrl":"https://doi.org/10.22323/1.363.0251","url":null,"abstract":"We utilize the eigenvalue filtering technique combined with the stochastic estimate of the mode number to determine the eigenvalue spectrum. Simulations of (2 + 1)-flavor QCD are performed using the Highly Improved Staggered Quarks (HISQ/tree) action on $N_{tau}$ = 8 lattices with aspect ratios $N_{sigma}/N_{tau}$ ranging from 5 to 7. The strange quark mass is fixed to its physical value $m_{s}^{rm phy}$, and the light quark masses $m_{l}$ are varied from $m_{s}^{rm phy}/40$ to $m_{s}^{rm phy}/160$ which correspond to pion mass $m_{pi}$ ranging from 110 MeV to 55 MeV in the continuum limit. We compute the chiral condensate and $chi_{pi} - chi_{delta}$ through the eigenvalue spectrum obtained from the the eigenvalue filtering method. We compare these results with those obtained from a direct calculation of the observables which involves inversions of the fermion matrix using the stochastic \"noise vector\" method. We find that these approaches yield consistent results. Furthermore, we also investigate the quark mass and temperature dependences of the Dirac eigenvalue density at zero eigenvalues to gain more insights about the $U_A(1)$ symmetry breaking in QCD.","PeriodicalId":147987,"journal":{"name":"Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019)","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115989775","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

Meson masses in external magnetic fields with HISQ fermions 外磁场中的介子质量与HISQ费米子

Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019) Pub Date : 2020-01-15 DOI: 10.22323/1.363.0250

H. Ding, Sheng-Tai Li, S. Mukherjee, A. Tomiya, Xiao-Dan Wang

{"title":"Meson masses in external magnetic fields with HISQ fermions","authors":"H. Ding, Sheng-Tai Li, S. Mukherjee, A. Tomiya, Xiao-Dan Wang","doi":"10.22323/1.363.0250","DOIUrl":"https://doi.org/10.22323/1.363.0250","url":null,"abstract":"We studied the temporal correlation function of mesons in the pseudo-scalar channel in (2+1)-flavor QCD in the presence of external magnetic fields at zero temperature. The simulations were performed on $32^3 times 96$ lattices using the Highly Improved Staggered Quarks (HISQ) action with $m_{pi} approx $ 230 MeV. The strength of magnetic fields $|eB|$ ranges from 0 to around 3.3 GeV$^2$ ($sim 60 m_pi^2$). We found that the masses of neutral pseudo-scalar particles, e.g. neutral pion and kaon, monotonouslly decrease as the magnetic field grows and then saturate at a nonzero value. It is observed that heavier neutral pseudo-scalars are less affected by magnetic fields. Moreover, we found a non-monotonous behavior of charged pion and kaon mass in magnetic field for the first time. In the case of small magnetic field (0 $leq~|eB| lesssim$ 0.3 GeV$^2~sim 6m_pi^2$ ) the mass of charged pseudo-scalar grows with magnetic field and can be well described by the Lowest Landau Level approximation, while for $|eB|$ larger than 0.3 GeV$^2$ the mass starts to decrease. The possible connection between $|eB|$ dependences of neutral pion mass and the decreasing behavior of pseudo-critical temperature in magnetic field is discussed. Due to the nonzero value of neutral pion mass our simulation indicates that the superconducting phase of QCD does not exist in the current window of magnetic field.","PeriodicalId":147987,"journal":{"name":"Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121510912","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: 16

Renormalization of bilinear and four-fermion operators through temporal moments 双线性和四费米子算子通过时间矩的重整化

Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019) Pub Date : 2020-01-15 DOI: 10.22323/1.363.0135

Tsutomu Ishikawa, K. Nakayama, S. Hashimoto

引用次数: 2

Structure functions from the Compton amplitude 结构函数来源于康普顿振幅

Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019) Pub Date : 2020-01-14 DOI: 10.22323/1.363.0137

QCDSF-UKQCD-CSSM collaboration Roger Horsley, Y. Nakamura, H. Perlt, P. Rakow, G. Schierholz, K. Somfleth, R. Young, J. Zanotti

引用次数: 7

Scaling and higher twist in the nucleon Compton amplitude 核子康普顿振幅的标度和高扭曲

Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019) Pub Date : 2020-01-14 DOI: 10.22323/1.363.0278

Ross D. Young, A. Hannaford-Gunn, R. Horsley, Y. Nakamura, H. Perlt, P. Rakow, G. Schierholz, K. Somfleth, H. Stuben, J. Zanotti

引用次数: 8

Spectroscopy of mesons with bottom quarks 带底夸克的介子光谱学

Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019) Pub Date : 2020-01-08 DOI: 10.22323/1.363.0173

S. Ryan

引用次数: 3

Tempered Lefschetz thimble method and its application to the Hubbard model away from half filling 回火Lefschetz顶针法及其在远离半填充的Hubbard模型中的应用

Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019) Pub Date : 2020-01-04 DOI: 10.22323/1.363.0090

M. Fukuma, N. Matsumoto, N. Umeda

引用次数: 3