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<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black">Dear all,<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black"> <o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black">TODAY, Wednesday, May 31<sup>st</sup>, at 1:00PM (EDT), we will have a cake seminar given by Justin Cammarota of William & Mary in CEBAF Center room L102.<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black"> <o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black">Please see below for the title and abstract.<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><b><u><span style="font-size:12.0pt;color:black">Cake Seminar</span></u></b><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black">Wednesday, May 31<sup>st</sup> at 1:00 PM<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black"> <o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><b><u><span style="font-size:12.0pt;color:black">Justin Cammarota</span></u></b><span style="font-size:12.0pt;color:black"> (William & Mary)<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black">Will discuss “The Impact of QED Effects in SIDIS”<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black"> <o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><b><u><span style="font-size:12.0pt;color:black">Abstract</span></u></b><span style="font-size:12.0pt;color:black">:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black;background:white">The factorization theorem plays an important role in the analysis of high energy quantum chromodynamic (QCD) processes, separating the nonperturbative hadronic interaction into
the universal parton distribution functions (PDFs) and fragmentation functions (FFs) and the process-dependent interactions into short distance perturbative calculations, with any interference power suppressed. With a virtual photon exchange, lepton-hadron
deep inelastic scattering (DIS) provides an electromagnetic hard probe for the partonic structure of colliding hadron and has played an important role in the development of QCD factorization. However, 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 DIS and semi-inclusive DIS (SIDIS) was derived, ill defined. A new analogous factorization approach has been introduced to separate the leading
power process-independent QED radiative contributions to the single photon exchange by introducing lepton distribution functions (LDFs) and lepton fragmentation functions (LFFs), while process-dependent effects are perturbatively calculated with large logarithms
removed [J. High Energ. Phys. 2021, 157 (2021)]. These LDFs and LFFs are considered global, as they appear in many different interactions, such as $e^+ e^-,$ DIS, and SIDIS, so data from experiments can be used to fit and describe these functions across a
wide range of lepton scattering. In this talk, I will apply this new factorization approach to lepton-hadron SIDIS to study the cross-section in two different kinematic regions: (1) the scattered lepton and observed hadron are not near back-to-back, and (2)
they are close to back-to-back, where collinear QCD factorization works for (1) and TMD QCD factorization for (2) while collinear QED factorization works for both, in a newly introduced hybrid factorization approach. As part of this work, I show the effects
on the SIDIS cross section using fixed order calculations for the unpolarized structure function by first showing the effect of the radiative corrections on the main kinematic variables, especially how the internal transverse momentum is significantly correlated
to the external angular dependence, and then the unpolarized structure function (or cross section) with matching between the descriptions for low and high transverse momentum.</span><span style="font-size:12.0pt;color:black"> <o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black"> <o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black">See you later,<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black">Caroline, Joe & Patrick<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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