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SUMMARY:Joint QED and QCD Factorization Approach to Lepton-Hadron Scatteri
 ng
DTSTART:20260623T150000Z
DTEND:20260623T170000Z
DTSTAMP:20260703T003200Z
UID:indico-event-33342@indico.bnl.gov
DESCRIPTION:Speakers: Justin Cammarota\n\nThe factorization theorem plays 
 an important role in the analysis of high energy QCD processes\, separatin
 g the nonperturbative hadronic interaction into the universal parton distr
 ibution functions (PDFs) and fragmentation functions (FFs) and the process
 -dependent interactions into short distance perturbative calculations. How
 ever\, the collision induced QED radiation can change the momentum of the 
 exchanged but unobserved virtual photon\, making the photon-hadron frame\,
  where the factorization formalism for deeply inelastic scattering (DIS) a
 nd semi-inclusive DIS (SIDIS) was derived\, ill defined. A new joint facto
 rization approach treats QED and QCD radiation on equal footing\, separati
 ng the leading power process-independent QED radiative contributions by in
 troducing lepton distribution functions (LDFs) and lepton fragmentation fu
 nctions (LFFs)\, while process-dependent effects are perturbatively calcul
 ated. These LDFs and LFFs are also universal\, so data from experiments ca
 n be used to fit and describe these functions across a wide range of lepto
 n scattering\, and taking advantage of agentic AI to extract their non-per
 turbative nature is part of our recent Genesis proposal. In this talk\, I 
 apply this new hybrid factorization approach to lepton-hadron DIS and SIDI
 S. For DIS\, I derive the NLO short distance perturbative contribution to 
 the cross section and demonstrate the effects the QED radiation has on the
  cross section using this approach. I then show the effects on the SIDIS c
 ross section using fixed order calculations for the unpolarized structure 
 function (with a matching between the descriptions for low and high transv
 erse momentum)\, first focusing on the effect of the radiative corrections
  on the main kinematic variables\, especially the correlation between the 
 internal transverse momentum and the external angular dependence. This new
  joint QED and QCD factorization method will be important for making predi
 ctions for the EIC.\n \n\nhttps://indico.bnl.gov/event/33342/
URL:https://indico.bnl.gov/event/33342/
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