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D meson semileptonic form factors in Nf=3 QCD with M"obius domain-wall quarks 具有M obius畴壁夸克的Nf=3 QCD中的D介子半光子形状因子
arXiv: High Energy Physics - Lattice Pub Date : 2017-11-30 DOI: 10.1051/epjconf/201817513007
T. Kaneko, B. Colquhoun, H. Fukaya, S. Hashimoto
{"title":"D meson semileptonic form factors in Nf=3 QCD with M\"obius domain-wall quarks","authors":"T. Kaneko, B. Colquhoun, H. Fukaya, S. Hashimoto","doi":"10.1051/epjconf/201817513007","DOIUrl":"https://doi.org/10.1051/epjconf/201817513007","url":null,"abstract":"We present our calculation of D to pi and D to K semileptonic form factors in Nf = 2+1 lattice QCD. We simulate three lattice cutoffs 1/a sim 2.5, 3.6 and 4.5 GeV with pion masses as low as 230 MeV. The M\"obius domain-wall action is employed for both light and charm quarks. We present our results for the vector and scalar form factors and discuss their dependence on the lattice spacing, light quark masses and momentum transfer.","PeriodicalId":8440,"journal":{"name":"arXiv: High Energy Physics - Lattice","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75945499","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: 13
Landau levels in QCD in an external magnetic field 外磁场下QCD的朗道能级
arXiv: High Energy Physics - Lattice Pub Date : 2017-11-23 DOI: 10.1051/epjconf/201817507014
F. Bruckmann, G. Endrődi, M. Giordano, S. Katz, T. Kovács, F. Pittler, Jacob Wellnhofer
{"title":"Landau levels in QCD in an external magnetic field","authors":"F. Bruckmann, G. Endrődi, M. Giordano, S. Katz, T. Kovács, F. Pittler, Jacob Wellnhofer","doi":"10.1051/epjconf/201817507014","DOIUrl":"https://doi.org/10.1051/epjconf/201817507014","url":null,"abstract":"We will discuss the issue of Landau levels of quarks in lattice QCD in an external magnetic field. We will show that in the two-dimensional case the lowest Landau level can be identified unambiguously even if the strong interactions are turned on. Starting from this observation, we will then show how one can define a “plowest Landau level” in the four-dimensional case, and discuss how much of the observed effects of a magnetic field can be explained in terms of it. Our results can be used to test the validity of low-energy models of QCD that make use of the lowest-Landau-level approximation.","PeriodicalId":8440,"journal":{"name":"arXiv: High Energy Physics - Lattice","volume":"37 1","pages":"07014"},"PeriodicalIF":0.0,"publicationDate":"2017-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77679686","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: 1
Baryon interactions from lattice QCD with physical masses - Strangeness S = -1 sector 具有物理质量的点阵QCD重子相互作用-奇异度S = -1扇区
arXiv: High Energy Physics - Lattice Pub Date : 2017-11-19 DOI: 10.1051/epjconf/201817505030
H. Nemura, S. Aoki, T. Doi, S. Gongyo, T. Hatsuda, Y. Ikeda, T. Inoue, T. Iritani, N. Ishii, T. Miyamoto, K. Sasaki
{"title":"Baryon interactions from lattice QCD with physical masses - Strangeness S = -1 sector","authors":"H. Nemura, S. Aoki, T. Doi, S. Gongyo, T. Hatsuda, Y. Ikeda, T. Inoue, T. Iritani, N. Ishii, T. Miyamoto, K. Sasaki","doi":"10.1051/epjconf/201817505030","DOIUrl":"https://doi.org/10.1051/epjconf/201817505030","url":null,"abstract":"We present our recent results of baryon interactions with strangeness S = −1 based on Nambu-Bethe-Salpeter (NBS) correlation functions calculated fromlattice QCD with almost physical quark masses corresponding to (mk ,mk ) ≈ (146, 525) MeV and large volume (La )4 ≈ (96a )4 ≈ (8.1 fm)4 . In order to perform a comprehensive study of baryon interactions, a large number of NBS correlation functions from NN to ΞΞ are calculated simultaneously by using large scale computer resources. In this contribution, we focus on the strangeness S = −1 channels of the hyperon interactions by means of HAL QCD method. Four sets of three potentials (the 3 S1 − 3 D1 central, 3 S1 − 3 D1 tensor, and the 1 S0 central potentials) are presented for the ∑N − ∑N (the isospin I = 3/2) diagonal, the ∧N − ∧N diagonal, the ∧N → ∑N transition, and the ∑N − ∑N (I = 1/2) diagonal interactions. Scattering phase shifts for ∑N (I = 3/2) system are presented.","PeriodicalId":8440,"journal":{"name":"arXiv: High Energy Physics - Lattice","volume":"27 1","pages":"05030"},"PeriodicalIF":0.0,"publicationDate":"2017-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81015843","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: 36
Complex Paths Around The Sign Problem. 围绕符号问题的复杂路径。
arXiv: High Energy Physics - Lattice Pub Date : 2017-11-16 DOI: 10.1051/epjconf/201817501020
P. Bedaque
{"title":"Complex Paths Around The Sign Problem.","authors":"P. Bedaque","doi":"10.1051/epjconf/201817501020","DOIUrl":"https://doi.org/10.1051/epjconf/201817501020","url":null,"abstract":"The Monte Carlo evaluation of path integrals is one of a few general purpose methods to approach strongly coupled systems. It is used in all branches of Physics, from QCD/nuclear physics to the correlated electron systems. However, many systems of great importance (dense matter inside neutron stars, the repulsive Hubbard model away from half-filling, dynamical and non-equilibrium observables) are not amenable to the Monte Carlo method as it currently stands due to the so-called \"sign-problem\". We review a new set of ideas recently developed to tackle the sign problem based on the complexification of field space and the Picard-Lefshetz theory accompanying it. The mathematical ideas underpinning this approach, as well as the algorithms so far developed, are described together with non-trivial examples where the method has already been proved successful. Directions of future work, including the burgeoning use of machine learning techniques, are delineated.","PeriodicalId":8440,"journal":{"name":"arXiv: High Energy Physics - Lattice","volume":"73 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79647452","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: 77
Nπ scattering in the Roper channel Roper通道中的Nπ散射
arXiv: High Energy Physics - Lattice Pub Date : 2017-11-16 DOI: 10.1051/epjconf/201817505004
M. Padmanath, C. Lang, L. Leskovec, S. Prelovsek
{"title":"Nπ scattering in the Roper channel","authors":"M. Padmanath, C. Lang, L. Leskovec, S. Prelovsek","doi":"10.1051/epjconf/201817505004","DOIUrl":"https://doi.org/10.1051/epjconf/201817505004","url":null,"abstract":"We present results from our recent lattice QCD study of $Npi$ scattering in the positive-parity nucleon channel, where the puzzling Roper resonance $N^*(1440)$ resides in experiment. Using a variety of hadron operators, that include $qqq$-like, $Npi$ in $p$-wave and $Nsigma$ in $s$-wave, we systematically extract the excited lattice spectrum in the nucleon channel up to 1.65 GeV. Our lattice results indicate that N$pi$ scattering in the elastic approximation alone does not describe a low-lying Roper. Coupled channel effects between $Npi$ and $Npipi$ seem to be crucial to render a low-lying Roper in experiment, reinforcing the notion that this state could be a dynamically generated resonance. After giving a brief motivation for studying the Roper channel and the relevant technical details to this study, we will discuss the results and the conclusions based on our lattice investigation and in comparison with other lattice calculations.","PeriodicalId":8440,"journal":{"name":"arXiv: High Energy Physics - Lattice","volume":"38 1","pages":"05004"},"PeriodicalIF":0.0,"publicationDate":"2017-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85992812","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
SU(2NF) symmetry of confinement in QCD and its observation at high temperature. QCD中约束的SU(2NF)对称性及其高温观测。
arXiv: High Energy Physics - Lattice Pub Date : 2017-11-16 DOI: 10.1051/epjconf/201818202046
L. Glozman
{"title":"SU(2NF) symmetry of confinement in QCD and its observation at high temperature.","authors":"L. Glozman","doi":"10.1051/epjconf/201818202046","DOIUrl":"https://doi.org/10.1051/epjconf/201818202046","url":null,"abstract":"In this talk we first overview lattice results that have led to the observation of new SU(2)_{CS} and SU(2N_F) symmetries upon artificial truncation of the near-zero modes of the Dirac operator at zero temperature and at high temperature without any truncation. These symmetries are larger than the chiral symmetry of the QCD Lagrangian and contain chiral symmetries SU(N_F)_L times SU(N_F)_R and U(1)_A as subgroups. In addition to the standard chiral transformations the SU(2)_{CS} and SU(2N_F) transformations mix the right- and left-handed components of the quark fields. It is a symmetry of the confining chromo-electric interaction while the chromo-magnetic interaction manifestly breaks it. Emergence of these symmetries upon truncation of the near-zero modes of the Dirac operator at T=0 means that all effects of the chromo-magnetic interaction are located exclusively in the near-zero modes, while confining chromo-electric interaction is distributed among all modes. Appearance of these symmetries at high T, where the temperature suppresses the near-zero modes, has radical implications because these symmetries are incompatible with the asymptotically free deconfined quarks at increasing temperature. The elementary objects in the high-temperature phase of QCD should be quarks bound by the pure chromo-electric field that is not accompanied by the chromo-magnetic effects.","PeriodicalId":8440,"journal":{"name":"arXiv: High Energy Physics - Lattice","volume":"33 1","pages":"02046"},"PeriodicalIF":0.0,"publicationDate":"2017-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78114101","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
Structure of the Nucleon and its Excitations 核子的结构及其激发
arXiv: High Energy Physics - Lattice Pub Date : 2017-11-15 DOI: 10.1051/epjconf/201817506019
W. Kamleh, D. Leinweber, Zhanfeng Liu, F. Stokes, A. Thomas, Samuel Thomas, Jia-Jun Wu
{"title":"Structure of the Nucleon and its Excitations","authors":"W. Kamleh, D. Leinweber, Zhanfeng Liu, F. Stokes, A. Thomas, Samuel Thomas, Jia-Jun Wu","doi":"10.1051/epjconf/201817506019","DOIUrl":"https://doi.org/10.1051/epjconf/201817506019","url":null,"abstract":"The structure of the ground state nucleon and its finite-volume excitations are examined from three different perspectives. Using new techniques to extract the relativistic components of the nucleon wave function, the node structure of both the upper and lower components of the nucleon wave function are illustrated. A non-trivial role for gluonic components is manifest. In the second approach, the parity-expanded variational analysis (PEVA) technique is utilised to isolate states at finite momenta, enabling a novel examination of the electric and magnetic form factors of nucleon excitations. Here the magnetic form factors of low-lying odd-parity nucleons are particularly interesting. Finally, the structure of the nucleon spectrum is examined in a Hamiltonian effective field theory analysis incorporating recent lattice-QCD determinations of low-lying two-particle scattering-state energies in the finite volume. The Roper resonance of Nature is observed to originate from multi-particle coupled-channel interactions while the first radial excitation of the nucleon sits much higher at approximately 1.9 GeV.","PeriodicalId":8440,"journal":{"name":"arXiv: High Energy Physics - Lattice","volume":"70 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83979356","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
On the D*s and charmonia leptonic decays 关于D*s和调和子的轻子衰变
arXiv: High Energy Physics - Lattice Pub Date : 2017-11-15 DOI: 10.1051/epjconf/201817513002
G. Bailas, B. Blossier, J. Heitger, V. Mor'enas, Matthias Post
{"title":"On the D*s and charmonia leptonic decays","authors":"G. Bailas, B. Blossier, J. Heitger, V. Mor'enas, Matthias Post","doi":"10.1051/epjconf/201817513002","DOIUrl":"https://doi.org/10.1051/epjconf/201817513002","url":null,"abstract":"Among the different scenarios of New Physics, those with an extended Higgs sector are examined with a lot of attention. Recent experimental observations of several anomalies in flavour physics with respect to expectations of the Standard Model further motivate the effort of phenomenologists. First, informations about the R D s ratio, a test of lepton flavour universality equivalent to R D , already measured, but with the s quark as spectator, are awaited in coming years to constrain the corner of an extended Higgs sector with charged doublets. On another side, leptonic widths of pseudoscalar quarkonia are particularly interesting to test an extended Higgs sector with a light CP-odd Higgs boson singlet, through the study of its mixing with quarkonia states. Hadronic parameters entering those processes have to be determined from lattice QCD with enough confidence on the control of systematic errors. We report on the very first step of a long-term program tackled with N f = 2 Wilson-Clover fermions to put relevant constraints on extensions of the Higgs sector: extraction of decay constants of D * s , ƞ c , ƞ c (2 S ), J / Ψ and Ψ (2 S ) with lattice ensembles provided by the CLS effort, considering 2 lattice spacings and a large range of pion masses to estimate cut-off effects and extrapolate results to the chiral limit.","PeriodicalId":8440,"journal":{"name":"arXiv: High Energy Physics - Lattice","volume":"1997 1","pages":"13002"},"PeriodicalIF":0.0,"publicationDate":"2017-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90448956","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
Spectroscopy of four-dimensional N = 1 supersymmetric SU(3) Yang-Mills theory 四维N = 1超对称SU(3) Yang-Mills理论的光谱学
arXiv: High Energy Physics - Lattice Pub Date : 2017-11-14 DOI: 10.1051/epjconf/201817508022
M. Steinhauser, A. Sternbeck, B. Wellegehausen, A. Wipf
{"title":"Spectroscopy of four-dimensional N = 1 supersymmetric SU(3) Yang-Mills theory","authors":"M. Steinhauser, A. Sternbeck, B. Wellegehausen, A. Wipf","doi":"10.1051/epjconf/201817508022","DOIUrl":"https://doi.org/10.1051/epjconf/201817508022","url":null,"abstract":"Supersymmetric gauge theories are an important building block for extensions of the standard model. As a first step towards Super-QCD we investigate the pure gauge sector with gluons and gluinos on the lattice, in particular the low energy mass spectrum: meson-like gluinoballs, gluino-glueballs and pure glueballs. We report on some first calculations performed with clover improved Wilson fermions on rather small lattices. The supersymmetric continuum limit and particle masses are discussed and compared to predictions from effective field theory.","PeriodicalId":8440,"journal":{"name":"arXiv: High Energy Physics - Lattice","volume":"57 1","pages":"08022"},"PeriodicalIF":0.0,"publicationDate":"2017-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84465085","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
An update on the BQCD Hybrid Monte Carlo program 更新的BQCD混合蒙特卡罗程序
arXiv: High Energy Physics - Lattice Pub Date : 2017-11-10 DOI: 10.1051/epjconf/201817514011
Taylor Haar, Y. Nakamura, H. Stuben
{"title":"An update on the BQCD Hybrid Monte Carlo program","authors":"Taylor Haar, Y. Nakamura, H. Stuben","doi":"10.1051/epjconf/201817514011","DOIUrl":"https://doi.org/10.1051/epjconf/201817514011","url":null,"abstract":"We present an update of BQCD, our Hybrid Monte Carlo program for simulating lattice QCD. BQCD is one of the main production codes of the QCDSF collaboration and is used by CSSM and in some Japanese finite temperature and finite density projects. Since the first publication of the code at Lattice 2010 the program has been extended in various ways. New features of the code include: dynamical QED, action modification in order to compute matrix elements by using Feynman-Hellman theory, more trace measurements, a more flexible integration scheme, polynomial filtering, term-splitting for RHMC, and a portable implementation of performance critical parts employing SIMD.","PeriodicalId":8440,"journal":{"name":"arXiv: High Energy Physics - Lattice","volume":"70 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85734961","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: 30
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