[Theory-seminars] Today 1PM, Room L102 - Pawel Sznajder

[Mathieu, Vincent]

Dear all,
here a reminder about today’s seminar.

BlueJeans: https://urldefense.proofpoint.com/v2/url?u=https-3A__bluejeans.com_321085255_&d=DwIGaQ&c=lz9TcOasaINaaC3U7FbMev2lsutwpI4--09aP8Lu18s&r=60nExCXZj9SCzny0kAZk-AjVzjr42OsgTZnvcFFHHk8&m=W4qZIG2MEFSGOQBGoCZHkcRqSuFBAi488tZm-2-pP9Y&s=l9A6hpPFdTg0hD1adX9yAbWbVCg7OGfwxpRqV4xCqYE&e= 

Pawel Sznajder (NCBJ Warsaw)
Extracting GPDs from DVCS data: Border and skewness functions at LO”

The formalism of Generalized Parton Distributions (GPDs) provides a set of novel and powerful tools for the investigation of the nucleon structure. In particular, it allows to describe the nucleon as an extended object and it gives an access to the QCD energy-momentum tensor. The latter allows to evaluate the contribution of orbital angular momentum to the nucleon spin through the so-called Ji’s sum rule and it helps to understand the distribution of "mechanical" forces acting on quarks.

After a brief introduction to the GPD formalism our recent phenomenological studies will be reported. We propose new parameterizations for the border and skewness functions appearing in the description of the nucleon structure in the language of GPDs. These parameterizations are constructed in a way to fulfill the basic properties of GPDs, like their reduction to Parton Density Functions and Elastic Form Factors. They also rely on the power behavior of GPDs in the x -> 1 limit and the propounded analyticity property of Mellin moments of GPDs. We evaluate Compton Form Factors (CFFs), the sub-amplitudes of the Deeply Virtual Compton Scattering (DVCS) process, at the leading order and leading twist accuracy. We constrain the restricted number of free parameters of these new parameterizations in a global CFF analysis of almost all existing proton DVCS measurements. The fit is performed within the PARTONS framework, being the modern tool for generic GPD studies.

- Vincent
----------------------------------------------------
Vincent Mathieu
Jefferson Lab Research Fellow
mathieuv at indiana.edu<mailto:mathieuv at indiana.edu>

Joint Physics Analysis Center:
https://urldefense.proofpoint.com/v2/url?u=http-3A__www.indiana.edu_-7Ejpac_index.html&d=DwIGaQ&c=lz9TcOasaINaaC3U7FbMev2lsutwpI4--09aP8Lu18s&r=60nExCXZj9SCzny0kAZk-AjVzjr42OsgTZnvcFFHHk8&m=W4qZIG2MEFSGOQBGoCZHkcRqSuFBAi488tZm-2-pP9Y&s=nL0ok28PmiVQZPf_5aC2MaUzz-DJUxngcX0ama-JAnA&e= 
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On Aug 19, 2018, at 1:47 PM, Alessandro Pilloni <pillaus at jlab.org<mailto:pillaus at jlab.org>> wrote:

Dear all,

tomorrow Monday, Aug 20, 1PM, Room L102
we have

Pawel Sznajder (NCBJ Warsaw)
Extracting GPDs from DVCS data: Border and skewness functions at LO"

We will circulate the abstract soon

   Alessandro, Andrea, Bipasha
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