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Xiangdong Ji (University of Maryland)12/1/22, 9:00 AM
Many present lattice QCD approaches to calculate the parton distribution functions (PDFs) rely on a factorization formula or effective theory expansion of certain Euclidean matrix elements in boosted hadron states. In the quasi- and pseudo-PDF methods, the matching coefficient in the factorization or expansion formula includes large logarithms near the threshold, which arise from the subtle...
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Xiaonu Xiong (Central South University, China)12/1/22, 9:25 AM
Nucleon transversity distribution is an essential quantity that reveals the nucleon's transverse spin structure. It also provides crucial inputs for understanding high-energy collision experiments involving transversely polarized nucleons. As a chiral-odd quantity, it's difficult to measure experimentally. Thus, ab initio lattice QCD calculations play an important complementary role. We report...
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David Richards (Jefferson Lab)12/1/22, 9:50 AM
I describe the structure of the nucleon obtained within the pseudo-PDF framework. In particular I present recent calculations of the unpolarized, helicity and transversity distributions. We employ the distillation framework which allows a more complete sampling of the lattice and, together with momentum smearing, enables us to extend the range of Ioffe time accessible to our computation. ...
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Andrew Hanlon (Brookhaven National Laboratory)12/1/22, 10:15 AM
We present recent work on the calculation of the unpolarized isovector quark parton distribution function (PDF) of the nucleon at the physical point from lattice QCD utilizing a next-to-next-to-leading order (NNLO) matching. The main observables for these calculations are equal-time spatially-separated matrix elements of a boosted nucleon. There are two main strategies one can employ to obtain...
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Michael Wagman (Fermilab)12/2/22, 9:00 AM
I will present a lattice QCD calculation of the nonperturbative Collins-Soper kernel, which describes the rapidity evolution of quark transverse-momentum-dependent parton distribution functions. I will discuss ongoing work to perform the first determination of the Collins-Soper kernel using approximately physical quark masses and various challenges and systematic uncertainties that arise,...
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Qi-An Zhang (Beijing University of Aeronautics and Astronautics )12/2/22, 9:25 AM
In this work, we present the first ab-initio numerical results of unpolarized proton's isovector transverse-momentum-dependent parton distribution functions (TMDPDFs), which are essential for exploring the inner pictures of nucleon, as well as for predicting the observables in multi-scale, non-inclusive high energy processes such as semi-inclusive deep-inelastic scattering and Drell-Yan...
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Jinchen He (University of Maryland)12/2/22, 9:50 AM
We present a first calculation of the unpolarized proton's
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isovector transverse-momentum-dependent parton distribution functions (TMDPDFs) from lattice QCD, which are essential to predict observables of multi-scale, semi-inclusive processes in the standard model. We use a $N_f=2+1+1$ MILC ensemble with valence clover fermions on a highly improved staggered quark sea (HISQ), and compute the... -
Fei Yao (Beijing Normal University)12/2/22, 10:15 AM
According to large momentum effective theory (LaMET), the parton observables can be extracted from lattice calculations of quasi-observables through a perturbative matching relation. In this talk, I present a unified framework for the perturbative factorization connecting Euclidean correlations to light-cone correlations. We derive the flavor singlet and non-singlet matching kernel for the...
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Jun Zeng (Shanghai Jiao Tong University)12/3/22, 9:00 AM
In large-momentum effective theory (LaMET), the transverse-momentum-dependent (TMD) light-front wave functions and soft functions can be extracted from the simulation of a four-quark form factor and equal-time correlation functions. In this work, using expansion by regions we provide a one-loop proof of TMD factorization of the form factor. For the one-loop validation, we also present a...
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Kuan Zhang (Institute for Theoretical Physics, CAS)12/3/22, 9:25 AM
To calculate the transverse-momentum-dependent parton distribution functions (TMDPDFs) from lattice QCD, an important goal yet to be realized, it is crucial to establish a viable nonperturbative renormalization approach for linear divergences in the corresponding Euclidean quasi-TMDPDF correlators in large-momentum effective theory. We perform a first systematic study of the renormalization...
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Min-Huan Chu (Shanghai Jiao Tong University)12/3/22, 9:50 AM
Soft function plays an important role in TMD factorization. We present a lattice QCD calculation for the rapidity-independent (or intrinsic) part of soft function at one-loop accuracy with a coherent normalization in large-momentum effective theory. The calculation is performed on CLS dynamic ensemble with a=0.098 fm and MILC ensemble with a=0.12 fm. Our results based on two ensembles are...
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Jun Hua (South China Normal University)12/3/22, 10:15 AM
We present a state-of-the-art lattice QCD calculation of transverse momentum dependent wave function (TMDWF) of pion in large-momentum effective theory. The calculation is performed at clover fermion action ensembles with lattice spacing a=0.12fm generated by MILC Collaboration with and CLS ensembles with lattice spacing a=0.098fm. On each of the two ensembles we calculated three momentum up to...
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