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Nuclear
Tuesday, May 17, 2022
3:30 PM
https://virginia.zoom.us/j/7615450175, Room via Zoom
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"Extraction of Compton Form Factors from DVCS experimental data"


Liliet Calero , UVA - Department of Physics
ABSTRACT:

Over the last 20 years, there has been intense experimental activity dedicated to the measurement of observables to help build a 3D description of the nucleon. Generalized parton distributions (GPDs) describe complementary aspects of the structure of hadrons, providing qualitative and quantitative information about the partonic structure and dynamics such as orbital angular momentum. The formulations of the Deeply Virtual Compton Scattering (DVCS) cross-section are parametrized in terms of Compton Form Factors (CFFs) which are convolutions of GPDs with coefficient functions computed from perturbative QCD. The CFFs are extracted from DVCS experimental data taken at Jefferson Lab, including the most recent Hall A data. The analysis consists of a local fitting technique where the CFFs, ReH, ReE, and ReHtilde are determined independently in each kinematic bin for the unpolarized beam-target configuration at twist-2 approximation using the formalism developed by A.V. Belitsky, D. Müller, and A. Kirchner (BKM02 and BKM10). Significant systematic studies were done to optimize the local fitting procedure. The resulting CFFs are then used to train and regularize the neural network to obtain a global behavior of the CFFs with minimal model dependency. This procedure is tested and systematically studied using pseudo data generated with kinematics mimicking the experimental data.

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https://virginia.zoom.us/j/94161602774?pwd=UEUveXcySHZkSElOL2lMbGI3Nmo5Zz09

Meeting ID: 941 6160 2774

Passcode: 360588


Tuesday, June 7, 2022
3:30 PM
Online, Room via Zoom
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"Global extraction of quark unpolarized Transverse Momentum Distributions at N3LL"


Chiara Bissolotti , Argonne National Laboratory
[Host: Ishara Fernando]
ABSTRACT:

Transverse Momentum Distributions (TMDs) are three-dimensional maps of hadrons in momentum space and generalize the well-known concept of collinear Parton Distribution Functions (PDFs). TMDs are crucial in understanding the 3D spin and momentum structure of the nucleon and other hadrons, and information on their functional form can be obtained, for example, from Drell-Yan and Semi-Inclusive Deep Inelastic Scattering (SIDIS).

In this seminar I will discuss the state-of-the-art status of unpolarized TMD extractions, focusing on the results obtained by the Pavia group and in particular on the most recent global TMD extraction that reaches the perturbative accuracy of next-to-next-to-next leading log.

To add a speaker, send an email to dmk9m@Virginia.EDU Include the seminar type (e.g. Nuclear Physics Seminars), date, name of the speaker, title of talk, and an abstract (if available). [Please send a copy of the email to phys-speakers@Virginia.EDU.]