[Hadstruct] [EXTERNAL] Re: LaMET2020 abstracts

Thu Aug 13 17:41:46 EDT 2020

Hi all,

Here is my modified abstract:

*"Nucleon Ioffe-time Pseudo-distributions from Distillation*

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 pseudo-distribution and model PDFs. We benchmark the
efficacy and systematics inherent to this choice by extracting the PDF from
the matched light-cone Ioffe-time distribution. The tempering of
excited-states and improved spatial sampling afforded by distillation is
likewise seen to allow for a meaningful simultaneous determination of the
isovector quark and sea-quark distributions. Comparisons with
phenomenological determinations are made."

So perhaps this isn't as orthogonal as hoped to your presentation Joe.

Best,
Colin

On Thu, Aug 13, 2020 at 4:55 PM Joseph Karpie <jmkarpie at email.wm.edu> wrote:

> I will edit mine to specify the unpolarized quark distributions to
> increase orthogonality to Colin's talk.
>
> On Thu, Aug 13, 2020 at 3:53 PM Raza Sufian <sufian at jlab.org> wrote:
>
>> Dear All,
>>
>> Below please find my abstract and it definitely requires editing. Please
>> let me know your opinion.
>>
>> Hadron structure from current-current correlation functions in lattice QCD
>>
>> We present how partonic structure of hadrons can be extracted from matrix
>> elements of two spatially-separated currents, which are computable directly
>> in lattice QCD and can be factorized into parton distribution functions
>> with calculable hard coefficients. We demonstrate the recently derived
>> one-loop matching coefficient that is central to this work has a
>> well-controlled behavior in Ioffe-time, for example, in a specific
>> calculation of pion valence quark distribution. We discuss issues in
>> obtaining PDFs from the factorized matrix elements which involves an
>> inverse problem - common to extraction of PDFs from lattice QCD
>> calculations or experimental data and what would require in a lattice
>> calculation to discriminate between different large $x$ behaviors of pion
>> valence PDF.
>>
>>
>> Thank you.
>> -Raza
>>
>> On Aug 13, 2020, at 4:49 PM, Colin Egerer <cpegerer at email.wm.edu> wrote:
>>
>> Hi Joe et al.,
>>
>> This is a good idea, and perhaps good that abstracts submitted in January
>> were lost as I had originally proposed to talk about the polarized quark
>> distributions from distillation.
>> I'll pass along an abstract for the unpolarized with distillation then
>> shortly.
>>
>> Best,
>> Colin
>>
>> On Thu, Aug 13, 2020 at 4:47 PM Monahan, Christopher <cjmonahan at wm.edu>
>> wrote:
>>
>>> I had originally assumed it was lost to the aether, too, but it is still
>>> in the Indico site, so I wasn't sure. Anyway, ignore the second one then.
>>>
>>> Regards,
>>> Chris
>>> ---
>>>
>>> Chris Monahan
>>> Pronouns: he/his
>>> Assistant Professor
>>> Department of Physics
>>> William & Mary
>>> ------------------------------
>>> *From:* David Richards <dgr at jlab.org>
>>> *Sent:* 13 August 2020 16:45
>>> *To:* Monahan, Christopher <cjmonahan at wm.edu>
>>> *Cc:* Joseph Karpie <jkarpie at gmail.com>; hadstruct at jlab.org <
>>> hadstruct at jlab.org>
>>> *Subject:* Re: [Hadstruct] [EXTERNAL] LaMET2020 abstracts
>>>
>>> Hi Chris and Joe,
>>>
>>> These (ie Chris I and Joe’s) both look good.  Do you know whether the
>>> January abstracts carry forward?
>>>
>>> David
>>>
>>> PS I wasn’t going to submit one...
>>>
>>> On Aug 13, 2020, at 4:38 PM, Monahan, Christopher <cjmonahan at wm.edu>
>>> wrote:
>>>
>>> Hi all
>>>
>>> Joe, thank you for suggesting this. My abstract, submitted a few days
>>> ago, is
>>>
>>> Connecting quasi and pseudo distributions in nongauge theories
>>>
>>> "I explore the explicit relationship between the LaMET and pseudo-PDF
>>> approaches to collinear hadron structure in the context of a scalar theory,
>>> and demonstrate explicitly their equivalence at one loop in perturbation
>>> theory. Scalar field theory removes complications associated with gauge
>>> theories that enable complete calculations of all quantities, such as the
>>> Ioffe-time distribution at arbitrary field separation, and demonstrate
>>> explicitly their interrelationships. This provides the ideal playground for
>>> analysing and clarifying the main features of both quasi- and pseudo-PDFs."
>>>
>>> Apparently I was so on top of things back in January that this is
>>> actually the second abstract I submitted. I had forgotten about the first
>>> (I mean it's not like anything major has happened since January 29th), and
>>> it is
>>>
>>> Finite volume effects for extended operators, vol. 2
>>>
>>> "Lattice determinations of parton distribution functions are now
>>> sufficiently mature that a proper accounting of systematic uncertainties is
>>> necessary for further progress. These determinations generally rely on
>>> nonperturbative calculations of matrix elements of spatially-extended
>>> operators, which may have enhanced finite volume effects relative to matrix
>>> elements of local operators. I present a dispersive technique for
>>> determining finite-volume effects associated with spatially-separated
>>> current operators. This framework would enable nonperturbative removal of
>>> the dominant finite volume effects given previously-determined lattice form
>>> factors. In this work we focus on the implications for the matrix elements
>>> of the pion, but the framework may be generalized to other states."
>>>
>>> Regards,
>>> Chris
>>>
>>> ---
>>>
>>> Chris Monahan
>>> Pronouns: he/his
>>> Assistant Professor
>>> Department of Physics
>>> William & Mary
>>> ------------------------------
>>> *From:* Hadstruct <hadstruct-bounces at jlab.org> on behalf of Joseph
>>> Karpie <jkarpie at gmail.com>
>>> *Sent:* 13 August 2020 16:26
>>> *To:* hadstruct at jlab.org <hadstruct at jlab.org>
>>> *Subject:* [Hadstruct] [EXTERNAL] LaMET2020 abstracts
>>>
>>> Hey everyone,
>>>
>>> Since we only have a few days left, I'd like to try to organize our
>>> abstracts for LaMET 2020 those who haven't sent them in already. Since
>>> there are a limited number of talks, we decided we should send in a number
>>> of abstracts and make them reject us. I figure if we try to make our
>>> abstracts overlap as little as possible, it will remove the excuse of
>>> repetition they could use to reject us off hand. Below is what I will send
>>> in. Can everyone who is thinking of sending in abstracts copy theirs so we
>>> can think about what to focus on?
>>>
>>> Below is my abstract where I plan to highlight the pseudo-PDF method and
>>> our latest results. I plan on discussing its distinctions from LaMET, but
>>> don't want that in the abstract as to not draw unnecessary ire. I've also
>>> pasted a link to my AP Latt talk which will be a basis for my slides.
>>> Please send me any comments on my abstract or slides.
>>>
>>> Best,
>>> Joe
>>>
>>> https://urldefense.proofpoint.com/v2/url?u=https-3A__conference-2Dindico.kek.jp_event_113_contributions_2114_&d=DwIFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=phC8jtUHUVIl1OXaA25HKnc5L16EvLwhrqx4rXYGPWA&m=EF0yV5RPRsw-VN3ORZswa8uhFBzDGbOnvxfQnFGcav8&s=sZW9vC80W0HaOt9-Ql2zch2sbzukYIVFaCS9vh32Ad4&e= 
>>> <https://urldefense.proofpoint.com/v2/url?u=https-3A__conference-2Dindico.kek.jp_event_113_contributions_2114_&d=DwMFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=phC8jtUHUVIl1OXaA25HKnc5L16EvLwhrqx4rXYGPWA&m=TGMha416R7BmOZMpXjw-2yH_zE6H5IzqLmrNh24zaY4&s=7ADZ15S4-hD9vzOCwQTUE2tXw5wF18i512VJga0A7gQ&e=>
>>>
>>> In this presentation, we focus on the pseudo-PDF method of calculating
>>> parton distributions. We use a Euclidean space matrix element, called the
>>> Ioffe-time pseudo distribution, and Short Distance Factorization, which
>>> allows data from all momenta to contribute in the analysis, to obtain
>>> parton distributions. We present the latest lattice results from the
>>> HadStruc collaboration, discuss several lattice systematics, discuss the
>>> inverse problem universal to PDF determinations, and perform a comparison
>>> with the pertinent phenomenological determinations.
>>> _______________________________________________
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>>> https://mailman.jlab.org/mailman/listinfo/hadstruct
>>>
>>>
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>>>
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-- 
Colin Egerer
Ph.D. Candidate, Physics
William & Mary
cpegerer at email.wm.edu
cegerer at jlab.org
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