Project description

Project is devoted to constructing parton-level Monte Carlo generator for forward particle production in kT-factorization at NLO.

Particles produced at large rapidity (forward) require large asymmetry in the longitudinal components of the momenta carrying by the colliding quarks or gluons; the parton that carries small fraction x of the longitudinal hadron momentum is usually gluon. In the small-x regime, it is required to use a special factorisation treatment that invloves Transverse Momentum Dependent (TMD) gluon distribution functions and higher twist corrections. This formalism is based on the high energy factorization of Catani, Ciafaloni, Hautmann). In the past we have automatized computation of partonic scattering in this framework at leading order (LO). There is also some progress in automatization of loop and real corrections. The present project will attempt to implement the NLO framework in modular and modern C++ Monte Carlo program, suitable for producing phenomenological results that can be tested at hadron colliders.

This National Science Centre project funds a PhD project that is currently ongoing.


Papers that acknowledge the project:

• Dijet azimuthal correlations in p-p and p-Pb collisions at forward LHC calorimeters,
  M.A. Al-Mashad, A. van Hameren, H. Kakkad, P. Kotko, K. Kutak, P. van Mechelen, S. Sapeta,
  JHEP 12 (2022) 131
  


• One-loop gauge invariant amplitudes with a space-like gluon,
  E. Blanco, A. Giachino, A. van Hameren, P. Kotko,
  Nucl.Phys.B 116322 (2023)
  


• Forward γ+jet production in proton-proton and proton-lead collisions at LHC within the FoCal calorimeter acceptance,
  I. Ganguli, A. van Hameren, P. Kotko, K. Kutak,
  Eur.Phys.J.C 83 (2023) 9, 868
  


• Searching for saturation in forward dijet production at the LHC, (review paper),
  A. van Hameren, H. Kakkad, P. Kotko, K. Kutak, S. Sapeta,
  Eur.Phys.J.C 83 (2023) 10, 947
  


• Color reconnection effects in J/ψ hadroproduction,
  P. Kotko, L. Motyka, A. Stasto,
  Phys.Lett.B 844 (2023) 138104
  

Acknowledgments

The project is supported by the National Science Centre, Poland grant no 2020/39/O/ST2/03011.