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Dear all, </div>
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<span style="color: rgb(0, 0, 0);"><br>
Tomorrow at 1:00PM EST, we will have a virtual seminar given by </span><span style="color: black;">Víctor Martínez-Fernández of IRFU/CEA Paris-Saclay</span><span style="color: rgb(0, 0, 0);"> on the Zoom for Government link: </span></div>
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<a href="https://jlab-org.zoomgov.com/j/1601003408?pwd=JIv7MSpqcMOF56Up66bHTS0sCwtotO.1" id="OWA206b31be-8028-a67a-ae6d-ce8be91df29a" class="x_x_x_OWAAutoLink" data-auth="NotApplicable" data-linkindex="0" style="margin: 0px;">https://jlab-org.zoomgov.com/j/1601003408?pwd=JIv7MSpqcMOF56Up66bHTS0sCwtotO.1</a></div>
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<b>While this is not an in-person seminar, we encourage everyone, especially postdocs and students, to join us in person for the remote seminar streaming in CEBAF Center F324/325. Coffee and tea will be provided.</b></div>
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Please see below for the title and abstract. </div>
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<b><u>Theory Seminar</u></b>:<b> </b>November 4<sup>th</sup>, 1:00PM EST (virtual and F324/325) </div>
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<b><u>Speaker</u></b>: Víctor Martínez-Fernández (IRFU/CEA Paris-Saclay) </div>
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<span style="font-size: 11pt;"><b><u>Title</u></b>:<b> </b></span><span style="font-size: 14.67px;">Precise hadron structure</span><span style="font-size: 11pt;"> </span></div>
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<span style="color: rgb(0, 0, 0);"><b><u>Abstract</u></b>: </span><span style="color: black;">Quantum Chromodynamics (QCD) is the theoretical framework to study hadrons by means of their fundamental degrees of freedom, namely quarks and gluons which are collectively
referred to as partons. QCD defines many types of distributions describing a given hadron in terms of partons. In this talk, we will begin by reviewing the concept of a
<i>forward</i> parton distribution function (PDF) and the "golden channel" for its extraction: deep inelastic scattering (DIS). Next, we will explore another function called the generalized
<i>off-foward</i> parton distribution (GPD). These ones are crucial elements of the theory for two main reasons: 1) they are related to the total angular momentum of partons within the hadron, and 2) the Fourier transform with respect to the transverse momentum
transfer of a particular GPD provides a transverse imaging of the hadron. We like to call this image as the hadron tomography. GPDs are accesesed thorugh different processes among which the most promising ones are: deeply virtual Compton scattering (DVCS),
timelike Compton scattering (TCS) and double deeply virtual Compton scattering (DDVCS).</span></div>
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<span style="font-family: Calibri, Helvetica, sans-serif; font-size: 11pt; color: black;">PDFs and GPDs arise from factorization that takes place in scattering cross-sections (for PDFs) and amplitudes (for GPDs) when a particle probing the hadron, typically
a virtual photon, is considered in the limit of infinite virtuality. This is known as the kinematic leading twist (LT). Current and future data can not be considered as a practical realization of the aforementioned LT approximation, suggesting the need for
corrections inversely proportional to the photon virtuality. Modern methods allowing these corrections to be restored to all orders will also be presented in this talk. Moreover, we will discuss relationships between different processes described by the same
GPDs beyond leading order in the strong coupling constant. These corrections are crucial for the precise extraction of partonic distributions and for testing their
<i>universality</i>, i.e. their independence from the process through which they are extracted. Phenomenological predicitons for current and future experimental facilities will also be presented.</span></p>
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<span style="font-family: Calibri, Helvetica, sans-serif; font-size: 11pt; color: black;">In summary, in this talk we will study different partonic distributions and the tools to access them beyond the lowest order approximation, including phenomenological
predictions for different possible experiments. </span></p>
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<span style="background-color: white;">We look forward to seeing you there!</span></div>
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Best regards, </div>
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Joe, Zheng-Yang, and Gloria</div>
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