Dear All,
 
We have the pleasure of inviting you to the Particle Theory Seminar on Tuesday, March 19  at 12:30, which will be given by
 

Paul Caucal (SUBATECH UMR 6457 (IMT Atlantique, Universite de Nantes, IN2P3/CNRS))

entitled

„SIDIS at next-to-leading order in the Regge limit".

Abstract:

The theoretical search for "golden channels" to measure gluon saturation in high-energy hadronic collisions is an active area of research given the arrival of the Electron Ion Collider. Recently, it has been shown that very forward single jet or hadron production in the Regge limit of semi-inclusive DIS could be a promising observable to reveal non-linear saturation effects in large nuclei [1].

In this talk, I will discuss this observable beyond leading order in pQCD at small-x. Within the Color Glass Condensate (CGC) effective field theory, we have computed in [2] the next-to-leading order (NLO) cross-section for the single-jet semi-inclusive cross-section in deep inelastic scattering (DIS) at small-x. Our analytic expressions, valid at finite Nc and suitable for numerical evaluation, demonstrate that the very forward rapidity regime is plagued by large double logarithmic corrections coming from phase space constraints on soft gluons close to the kinematic threshold for jet production. A joint resummation of small-x and threshold logarithms is proposed to remedy the instability of the cross-section in the very forward jet limit. Finally, I will comment on the phenomenological consequences of QCD radiative corrections in the search for saturation signatures in SIDIS, as well as on-going progresses in the numerical evaluation of the full NLO cross-section.

Refs:

[1] Iancu, Mueller, Triantafyllopoulos, Wei, JHEP 07 (2021) 196,

[2] Caucal, Ferrand, Salazar, arXiv:2401.01934