A. Afanasev/H.Avakian Precision RC, JLab, May 19.

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Presentation transcript:

A. Afanasev/H.Avakian Precision RC, JLab, May 19

x-sections change rapidly Elouadrhiri Bressan Precision RC, JLab, May 19

x-sections have a number of azimuthal moments radiatiation may generate new moments and mix existing ones Akushevich Precision RC, JLab, May 19

EIC Need radiative corrections over a wide range in kinematics E.C. Aschenauer Need radiative corrections over a wide range in kinematics for a wide range of (un)polarised observables in ep / eA Precision RC, JLab, May 19

Need a realistic MC Diefenthaler Precision RC, JLab, May 19

Analysis of azimuthal moments in SIDIS/HEP Data (contains N events with 4 vectors of reconstructed particles, N~1B) MC with RC (contains M events with 4 vectors of generated and reconstructed particles, M~5-10N) acceptance Microscopic bins (counts in l,L,x,y,[z,PT][t], f) defining detector acceptance, efficiency and material on path of leptons Define x-sections/normalized counts Counts in microscopic bins in l,L,x,y, [z,PT][t],f, corrected for detector acceptance and efficiency GPD/TMD extraction framework Fundamentals SFs, evolution Perform radiative corrections and fits GPD/TMD extraction Multiplicities and azimuthal moments in macroscopic bins in x,y, [z,PT][t], corrected for Radiative Corrections GPD/TMD library Precision RC, JLab, May 19

Analysis of azimuthal moments in SIDIS/HEP MC +RC (contains M events with 4 vectors of generated and reconstructed particles, M~100-1000N) Data (contains N events with 4 vectors of reconstructed particles, N~1B) acceptance Elementary bins (counts in l,L,x,y,[z,PT][t], f) defining detector acceptance, efficiency and material on path of leptons Define x-sections/normalized counts Counts in elementary bins in l,L,x,y, [z,PT][t],f, corrected for detector acceptance and efficiency GPD/TMD extraction framework Fundamentals SFs, evolution,RC Pros: Only pure (no theory based assumptions) experimental data will serve as input for extraction framework Elementary (limited by resolution) bins would allow also “event based” analysis (unbinned, Bessel,…) Cons: Require 10-100 times more computing power GPD/TMD extraction GPD/TMD library Precision RC, JLab, May 19

Extraction and validation of 3D PDFs ThePEG framework, HERWIG++,PYTHIA TMDlib and TMDplotter version 1.0.0” Hautman et al Preprint 1408.3015 SIDIS,DY,e+/e-) experiments Hard Scattering MC+RC QCD fundamentals RC/unfolding SFs PDF and FF Library (models,parametrizations) Hard Scattering Data Counts (x-sections, multiplicities,….) 3D analysis framework, phenomenology Soffer/Zavada/Roberts/Matevosyan/Melnitchouk/ Develop reliable and model independent techniques for the extraction of 3D PDFs and fragmentation functions from the multidimensional experimental observables. Anselmino et al, arXiv:1510.05389 Observables which are constructed by taking ratios are not ideal grounds for the study of TMD evolution effects. More effort should be made towards measuring properly normalized SIDIS and e+e-, and Drell-Yan cross sections (both unpolarised and polarised) Precision RC, JLab, May 19

SUMMARY Electromagnetic corrections are crucial for interpretation of electroproduction data. Extension and further development of the theoretical and computational approaches to higher-order QED effects for electron scattering is an outstanding problem for the upcoming physics analysis effort at JLab/EIC/.... Need a full set of SFs for consistent applications of RC Need a self consistent procedure integrating radiative corrections in the extraction of 3D PDFs, GPDs and form factors in nucleons and nuclei. Precision RC, JLab, May 19