[Theory-seminars] Cake seminar next Monday: Jianwei Qiu

[Astrid Hiller Blin]

Dear All,

It is our pleasure to host Jianwei's cake seminar next Monday. As always in
this less formal seminar setting, we will connect *20 min before* the
seminar for a *coffee break* all together.

Bluejeans connection: https://bluejeans.com/801786278

*Cake seminar*
Monday April 12th, 1:00 PM

*Jianwei Qiu* (JLab) will speak about the "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.

We look forward to seeing you there!
Astrid, Christos, Filippo
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