Speaker
Description
The nonperturbative processes, the internal transverse motion of partons inside
the hadrons (intrinsic-kt) and the multiple soft gluon emissions which
have to be resummed, are dominant contributions at low transversal momentum of
the Drell-Yan (DY) pair cross section. Therefore, this part of the DY spectra
presents a powerful tool for better understanding of such processes which is a
focus of the study presented here. The study is performed using the Parton
Branching Method which describes Transverse Momentum Dependent (TMD)
parton densities and provides very precise description of DY pT distributions
in a wide range of collision energies and pair invariant masses.
The soft gluon contribution was varied by introducing minimal transversal momentum
of a parton emitted at a branching and the parton intrinsic-kT was estimated
based on the best agreement between experimental results and the prediction.
It has been observed that the reduction of the soft gluon emissions introduced by minimal
momentum at a branching, requires more intense internal transversal motion
(larger intrinsic-kt) to describe experimental
data. The intrinsic-kt increases with the minimal transversal
momentum in a branching and this rise is faster when the centre-of-mass
collision energy is larger.
In this study we also examine how for the various soft gluon contributions
the intrinsic-kt depends on DY hard scattering scale, Q, by performing the
intrinsic-kt tuning for a wide range of DY pair invariant masses at several center-of-mass
energies.
The DY transversal momentum distributions obtained with the tuned intrinsic-kt for
various contributions of the soft gluon emissions are analysed and compared in
a wide range of collision energies and DY pair invariant masses.
Details
Dr Nataša Raičević, University of Montenegro, Faculty of Science and Mathematics, Montenegro
https://www.ucg.ac.me/
| Internet talk | No |
|---|---|
| Is this an abstract from experimental collaboration? | No |
| Name of experiment and experimental site | Public results of experimental measurements are used: CMS, ATLAS, D0, CDF, Phenix, E605 |
| Is the speaker for that presentation defined? | Yes |
