[Theory-seminars] Cake Seminar: Monday Apr. 12 at 1:00PM EDT

[Christos Kallidonis]

Dear all,

Tomorrow we will have a Cake Seminar, please see below for details:

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Bluejeans connection: https://bluejeans.com/801786278
Date and time: Monday April 12, 2021, 1:00PM EDT
Speaker: Jianwei Qiu (JLab)
Title: Impact of QED radiation on extracting QCD physics from lepton-hadron scattering at JLab and EIC
Abstract: Lepton-hadron deep inelastic scattering (DIS) experiment at SLAC over 50 years ago discovered the partonic structure of hadrons.  By exchanging a vector boson with a large momentum transfer, lepton-hadron scattering provides an excellent electromagnetic (or weak) probe for the partonic structure inside a bound hadron. However, scattering with a large momentum transfer naturally induces radiation of photons from the colliding lepton to make the “probe” less determined or controlled. Traditionally, the impact of such QED radiations to the measured DIS cross sections has been taken care of by introducing a radiative correction factor to the inclusive cross section as if there is no induced QED radiation. We demonstrate that such approach does not work for semi-inclusive DIS (SIDIS) when the extraction of 3D hadron structure is involved. We propose a new factorized approach to QED radiative contribution to the lepton-hadron DIS and SIDIS. The new approach allows the systematic resummation of the logarithmically enhanced QED radiation into factorized lepton distribution and fragmentation (or jet) functions that are universal for all final states, and systematic extraction of universal structure functions, from which the transverse momentum dependent parton distributions of hadrons (TMDs) can be further extracted. Our unified factorization approach to QCD and QED dynamics has important implications for future analyses of hard scattering at the EIC.
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Feel free to join 20 minutes before the seminar for a coffee break!

Kindly note that we have now started recording the seminars. The recording archives can be found here:
         https://www.jlab.org/theory/seminars/2021seminars


See you all there!

Best regards,
Astrid, Christos, Filippo
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