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[Somogyi Gábor <somogyi.gabor AT wigner.hu>]

Wigner FK RMI Elméleti Osztály Szemináriuma
Tisztelettel meghívjuk


Vaibhav Pathak
(Institute of Mathematical Sciences, Chennai, India)


“NNLO correction to Unpolarised and Polarised SIDIS”


címmel tartandó szemináriumára.


Kivonat:



The semi-inclusive deep-inelastic scattering (SIDIS) process requires the 
presence of an identified hadron H in the final state, which arises from the 
scattering of a lepton with an initial hadron P. By employing factorization 
in quantum chromodynamics (QCD), SIDIS provides essential knowledge on the 
hadron structure, enabling the exploration of parton distribution functions 
(PDFs) and fragmentation functions (FFs). The coefficient functions for SIDIS 
can be calculated in perturbative QCD and are currently known to the 
next-to-next-to-leading order (NNLO) for the cases, where the incoming lepton 
and the hadron P are either both polarized or unpolarized. We present a 
detailed description of these NNLO computations, including a thorough 
discussion of all the partonic channels, the calculation of the amplitudes 
and master integrals for the phase-space integration as well as the 
renormalization of ultraviolet divergences and mass factorization of infrared 
divergences in dimensional regularization through NNLO. We provide an 
extensive phenomenological analysis of the effects of NNLO corrections on 
SIDIS cross sections for different PDFs and FFs and various kinematics, 
including those of the future Electron-Ion Collider (EIC). We find that these 
corrections are not only significant but also crucial for reducing the 
dependence on the renormalization and factorization scales µR and µF to 
obtain stable predictions.


Helye: Wigner FK RMI III. ép. Tanácsterem
Ideje: 2025 szeptember 22. hétfő d.u. 13:00 óra (SZOKÁSOSTÓL ELTÉRŐ IDŐPONT)

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