Conveners
Session II
- Yong Zhao (Massachusetts Institute of Technology)
Session II
- Wei Wang (Shanghai Jiaotong University)
Session II
- Feng Yuan (Lawrence Berkeley National Laboratory)
Session II
- Martha Constantinou (Temple University)
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Mr Xiang Gao (BNL&THU)07/09/2020, 11:20
We present a high-statistics lattice QCD determination of the valence parton distribution function (PDF) of pion, with a mass of 300 MeV, using HISQ gauge ensambles with two very fine lattice spacings of a = 0.06 fm and 0.04 fm. Our analysis use both RI-MOM and ratio-based schemes to renormalize the equal-time bi-local quark-bilinear matrix elements of pions boosted up to 2.4 GeV momenta. We...
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Ms Stella Schindler (MIT)07/09/2020, 11:50
Transverse-momentum-dependent parton distribution functions (TMDPDFs) provide a unique probe of the three-dimensional spin structure of hadrons. We construct spin-dependent quasi-TMDPDFs that are amenable to lattice QCD calculations and that can be used to determine spin-dependent TMDPDFs. We calculate the short-distance coefficients connecting spin-dependent TMDPDFs and quasi-TMDPDFs at...
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Jianhui Zhang (Beijing Normal University)08/09/2020, 11:20
In large-momentum effective theory (LaMET), the quasi light-front correlations calculated on lattice contain both linear and logarithmic divergences in the lattice spacing, and thus need to be properly renormalized. The commonly used renormalization strategy in the literature has the problem of introducing extra non-perturbative effects at large distance. In this talk, I present a hybrid...
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Mr Zheng-Yang Li (Peking University)08/09/2020, 11:32
Quark correlation functions in position space are calculable in lattice QCD and factorizable into parton distribution functions with matching coefficients perturbatively calculable to all orders in QCD, which provides a way to extract PDFs from lattice QCD calculation. We present for the first time complete next-to-next-to-leading-order calculation of valence-quark matching coefficients. We...
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Jun Hua (SJTU)08/09/2020, 11:44
We present a lattice-QCD calculation of $\pi , K$ distribution amplitudes using large-momentum effective theory (LaMET). Our results are calculted at 130-MeV pion mass with three different lattice spacing: 0.06, 0.09 and 0.12 fm, using 2+1+1 flavors of highly improved staggered quarks (HISQ) ensembles generated by MILC collaboration. We use the hybrid renormalization scheme for quasi...
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Yikai Huo (Columbia University)08/09/2020, 11:56
Even since the quasi parton distribution function (PDF) was proposed within the large-momentum effective theory (LaMET) framework, its renormalization under lattice regularization has been a central challenge due to the existence of linear divergences. Previous theoretical studies have shown that the quasi-PDF operator is multiplicatively renormalizable and the linear divergence comes from the...
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Jian Liang (University of Kentucky)10/09/2020, 11:20
We propose to study the hadronic tensor with lattice QCD, which works in all the energy ranges (from elastic scattering to inelastic scattering and on to deep inelastic scattering) and is related to many important physical problems. A challenge of this approach in the study of PDFs is to access high momentum and energy transfers, and numerical tests show that small lattice spacings are...
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Colin Egerer10/09/2020, 11:32
The pseudo-distribution formalism is one such lattice methodology capable of extracting light-cone distributions from matrix elements of suitably constructed Euclidean non-local operators of a spacelike extent. Leveraging the distillation spatial smearing program, we extract the unpolarized isovector quark distribution of the nucleon via a direct 1-loop matching of the Ioffe-time...
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Shuai Zhao (ODU/JLab)10/09/2020, 11:44
We propose the approach for lattice investigation of light-cone distribution amplitudes of heavy-light mesons, such as B-meson, using both the formalism of quasi- and pseudo-distributions. We discuss the multiplicative renormalizability of the off-light-cone HQET operator with the aid of auxiliary field approach, and determine the perturbative matching coefficient entering the hard-collinear...
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Dr Kyriakos Hadjiyiannakou (University of Cyprus)10/09/2020, 11:56
We will present results on the spin decomposition and the momentum distribution among quarks and gluons in the proton. Techniques for lattice QCD simulations at the physical pion mass applied for the computation of sea-quark and gluon contributions will be presented. We will discuss several challenges and perspectives for future developments.
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Krzysztof Cichy (Adam Mickiewicz University)11/09/2020, 11:20
We present a lattice exploration of the isovector flavor combination of the nucleon's twist-3 helicity PDF g_T(x), using twisted mass clover fermions. We employ the quasi-distribution approach at three values of the nucleon boost up to 1.7 GeV to connect the lattice-extracted matrix elements, renormalized in the RI/MOM scheme, to light-cone distributions, applying the matching procedure that...
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Maximilian Schlemmer (University of Regensburg)11/09/2020, 11:32
I present the lattice calculation and results for the nonpertrubative Collins-Soper (CS) kernel, which describes the energy-dependence of the transverse momentum-dependent parton distribution functions (TMDPDFs). The CS kernel is extracted from the ratios of the quasi-TMD taken at different momenta.
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The analysis is done with dynamical fermions for different polarization cases of quasi-TMD... -
Wayne Morris (Old Dominion University)11/09/2020, 11:44
We present the results that are necessary in the ongoing lattice calculations of the gluon parton distribution functions (PDFs) within the pseudo-PDF approach. We give a classification of possible two-gluon correlator functions and identify those that contain the invariant amplitude determining the gluon PDF in the light-cone $z^2 \to 0$ limit. One-loop calculations have been performed in the...
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Zhouyou Fan (Michigan State University)11/09/2020, 11:56
The parton distribution functions (PDFs) provide process-independent information about the quarks and gluons inside hadrons. Although the gluon PDF can be obtained from a global fit to experimental data, it is not constrained well in the large-$x$ region. Theoretical gluon-PDF studies are much fewer than those of the quark PDFs. In this work, we present the first lattice-QCD results that...
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