[Theory-seminars] Cake Seminar Wednesday - Harut Avagyan

[Zheng-Yang Li]

Dear all,

On Wednesday, November 6th, 2024 at 1pm EST, we will have a cake seminar given by Harut Avagyan of Jlab in CC L102 and on the following Zoom link:

https://jlab-org.zoomgov.com/j/1608577458?pwd=apeKwnbcc9XKCJKWPeEuLQmYfcrBHO.1

Attendance in person is highly encouraged. Please see below for the title and abstract.

Cake Seminar: Wednesday, November 6th, 2024 at 1pm EST

Speaker: Harut Avagyan (Jlab)

Title: Semi-Inclusive DIS: connecting experiment with theory

Abstract: Semi-inclusive deep inelastic scattering (SIDIS) in recent decades emerged as a powerful tool for investigating nucleon structure and quark-gluon dynamics. Measurements of the SIDIS cross sections for various hadron production processes and different configurations for initial lepton and target nucleon polarizations provide essential information about the underlying quark distributions and their interactions within the nucleon, also critical in disentangling the genuine intrinsic transverse structure of hadrons encoded in 3D partonic distributions including Transverse Momentum Distributions (TMDs).

Phenomenological analysis of SIDIS data require a complete understanding of the mechanism of hadron production in lepton-nucleon interactions in terms of QCD factorization theorems, including hadron production in the current fragmentation region (CFR), the target fragmentation region (TFR), and correlations between them. The complexity of the SIDIS reaction poses significant experimental challenges to isolate different structure functions describing different dynamical contributions.

>From an experimental point of view the SIDIS, with detection of the scattered lepton and hadrons in the final state is always multidimensional, requiring high precision measurements of cross sections, hadron multiplicities, polarization-independent, and spin-dependent azimuthal asymmetries in accessible phase space to unravel the intricate dependencies on relevant kinematical variables and different dynamical contributions.

Recent studies in JLab, for example, indicate that exclusive vector meson contributions, which are not included in the current formalism of 3D studies, can indeed dramatically change all SIDIS observables, and in particular, single- and double-spin asymmetries for charged pions. Presence of those contributions, which stay as a significant part of the SIDIS at all available and planned in future polarized leptoproduction experiments, present a major challenge for the phenomenology of 3D PDF studies, requiring combined efforts of theoretical and experimental communities involved in studies of non-perturbative QCD dynamics.

In this talk, we will present ongoing studies and some future measurements that would also allow us to address physics backgrounds unaccounted for in the current theoretical frameworks, and discuss the path to improving the agreement between theory and polarized SIDIS experiments from JLab to EIC.

See you on Wednesday.

Best regards,
Joe, Zheng-Yang & Gloria
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