[Theory-seminars] Theory seminar June 28 - Rabah Abdul Khalek

[Astrid Hiller Blin]

Dear all,

Next Monday, June 28 at 1:00 PM, Rabah Abdul Khalek will give a theory
seminar on https://bluejeans.com/801786278
<https://www.google.com/url?q=https://bluejeans.com/801786278/5878?src%3DcalendarLink&sa=D&source=calendar&usd=2&usg=AOvVaw25sgt91GOrFua-h6qKqY9J>,
see below for details.

The recordings and slides of our seminars can be found in the archives:
https://www.jlab.org/theory/seminars/2021seminars

*Theory seminar*
Monday, June 28, 1:00 PM

*Rabah Abdul Khalek* (Nikhef) will talk about "A determination of
unpolarised pion fragmentation functions using semi-inclusive
deep-inelastic-scattering data: MAPFF1.0".

*Abstract:*
I will present MAPFF1.0, a determination of unpolarised charged-pion
fragmentation functions (FFs) from a set of electron-positron
single-inclusive annihilation and lepton-nucleon semi-inclusive
deep-inelastic-scattering (SIDIS) data.
FFs are parametrised in terms of a neural network (NN) and fitted to data
exploiting the knowledge of the analytic derivative of the NN itself w.r.t.
its free parameters.
Uncertainties on the FFs are determined by means of the Monte Carlo
sampling method properly accounting for all sources of experimental
uncertainties, including that of parton distribution functions.
Theoretical predictions for the relevant observables, as well as evolution
effects, are computed to next-to-leading order (NLO) accuracy in
perturbative QCD.
We exploit the flavour sensitivity of the SIDIS measurements delivered by
the HERMES and COMPASS experiments to determine a minimally-biased set of
seven independent FF combinations.
Moreover, we discuss the quality of the fit to the SIDIS data with low
virtuality $Q^2$ showing that, as expected, low-$Q^2$ SIDIS measurements
are generally harder to describe within a NLO-accurate perturbative
framework.

Have a good weekend,
Astrid, Christos and Filippo
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