[Hadstruct] [EXTERNAL] Re: LaMET2020 abstracts

Thu Aug 13 16:55:03 EDT 2020

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=wXdOHrbfU6ZO7fmWUpeSNHg6cg3K2YcZhhB0dGVVLrU&s=bCPTu6kU658fm3snAMIerG23vGWAfH1YQmwDKrP6_qM&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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