[Hadstruct] [EXTERNAL] Re: Proposed abstracts for Lattice 2021

Thu Apr 29 12:32:46 EDT 2021

Hey,

Just to make sure no one feels left out, I believe Kostas suggested you
list who'll be put as contributors to your talks.

Best,
Joe

On Thu, Apr 29, 2021 at 12:25 PM Raza Sufian <sufian at jlab.org> wrote:

> Dear All,
>
> Below please find my abstract. Since I do not know yet whether matrix
> elements of pseudo-PDF or LCS or both can have signal, I do not mention any
> formalism and just say Ioffe-time distribution.
>
> *Title: Towards determining polarized gluon distribution from lattice QCD*
>
> *Abstract: We present a calculation of lattice QCD non-local matrix
> elements that can be used to determine polarized gluon Ioffe-time
> distribution and the corresponding parton distribution function using QCD
> short distance factorization. We construct the nucleon interpolation fields
> using the distillation technique and flow the gauge fields using the
> gradient flow technique. Our calculation is performed on a $32^3 \times
> 64$ **isotropic lattice with a pion mass of 358 MeV.*
>
> Thank you.
> -Raza
>
> On Apr 29, 2021, at 11:27 AM, Wayne Morris <wmorr001 at odu.edu> wrote:
>
> *Unpolarized and polarized gluon pseudo-distributions at short distances:
> Forward case*
>
> We present the results that are necessary in the ongoing lattice
> calculations of the unpolarized and polarized 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 coordinate
> representation and in an explicitly gauge-invariant form. We made an effort
> to separate ultraviolet (UV) and infrared (IR) sources of the $\ln
> \left(-z^2\right) $-dependence at short distances $z^2$. The UV terms
> cancel in the reduced Ioffe-time distribution (ITD), and we obtain the
> matching relation between the reduced ITD and the light-cone ITD. Using a
> kernel form, we get a direct connection between lattice data for the
> reduced ITD and the normalized gluon PDF.
>
> On Thu, Apr 29, 2021 at 11:09 AM Md Tanjib Atique Khan <
> mkhan01 at email.wm.edu> wrote:
>
>> Dear all,
>>
>> Here is my abstract for Lattice21.
>>
>> Title: Calculation of the Gluon PDF using Pseudo-PDF technique
>>
>> Abstract:
>>
>> We present our calculation of the unpolarized gluon parton distribution function (PDF) in the nucleon using Pseudo-PDF technique on a $32^3 \times 64$
>> isotropic lattice with a pion mass of 358 MeV. The nucleon interpolating fields are constructed using the distillation method while the sGEVP method is
>> used to calculate the gluonic matrix elements. We implement the gradient-flow technique to compute the flowed matrix elements and using the double ratio,
>> calculate the flowed reduced Ioffe-time distribution (rITD). We extrapolate the results to the flow-time independent rITD and calculate the light-cone ITD
>> in $\overline{MS}$ scheme, at the small z-separation limit, using NLO matching formula. Finally, the gluon PDF is calculated from the light-cone ITD by
>> applying appropriate kernel form.
>>
>> Thanks,
>>
>> Tanjib
>>
>>
>> On Wed, Apr 28, 2021 at 5:55 PM Savvas Zafeiropoulos <savvaslz at gmail.com>
>> wrote:
>>
>>> Dear All,
>>>
>>> here is my abstract and title for lattice 2021
>>>
>>> *Progress on the extraction of parton distributions from Ioffe time
>>> distributions*
>>>
>>> The light-cone definition of Parton Distribution Functions (PDFs) does
>>> not allow for a direct ab initio determination employing methods of Lattice
>>> QCD simulations that naturally take place in Euclidean spacetime. In this
>>> presentation we focus on pseudo-PDFs where the starting point is the equal
>>> time hadronic matrix element with the quark and anti-quark fields separated
>>> by a finite distance. We focus on Ioffe-time distributions, which are
>>> functions of the Ioffe-time ν, and can be understood as the Fourier
>>> transforms of parton distribution functions with respect to the momentum
>>> fraction variable x. We present lattice results for the case of the nucleon
>>> addressing the physical point and continuum extrapolations. We also
>>> incorporate our lattice data in the NNPDF framework treating them on the
>>> same footing as experimental data and discuss in detail the different
>>> sources of systematics in the determination of the non-singlet PDFs.
>>>
>>> Since I am going to present results from three published papers all the
>>> authors of those papers will be contributors for my talk in the indico
>>> website.
>>> If anyone has a suggestion/correction etc please let me know!
>>>
>>> Best,
>>> Savvas
>>>
>>> On Wed, Apr 28, 2021 at 3:55 PM Raza Sufian <sufian at jlab.org> wrote:
>>>
>>>> Dear All,
>>>>
>>>> Below please find the proposed abstracts for the Lattice 2021
>>>> conference. The deadline for abstract submission is on Friday, April 30.
>>>> Please try to circulate your abstracts sometime tomorrow for comments.
>>>> Please let us know if I forgot to list any other proposed abstract.
>>>>
>>>> CK: Nucleon valence distribution using distillation
>>>>
>>>> SZ: Nucleon valence distribution (continuum limit, physical point
>>>> extrapolation + NNPDF analysis)
>>>>
>>>> TK: Unpolarized gluon distribution
>>>>
>>>> JK: RBC/UKQCD
>>>>
>>>> NK: Transversity
>>>>
>>>> RSS: Polarized gluon distribution
>>>>
>>>> WM: Perturbative matching for …
>>>>
>>>>
>>>> *TBD:*
>>>>
>>>> Patrick Barry
>>>>
>>>> CE
>>>>
>>>> Thank you.
>>>> -Raza
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