https://doi.org/10.1140/epjc/s10052-018-5645-z
Regular Article - Theoretical Physics
Some dipole shower studies
1
Theoretical Particle Physics, Department of Astronomy and Theoretical Physics, Lund University, 223 62, Lund, Sweden
2
School of Physics and Astronomy, University of Manchester, Schuster Building, Oxford Road, Manchester, M13 9PL, UK
* e-mail: baptiste.cabouat@manchester.ac.uk
Received:
16
November
2017
Accepted:
12
February
2018
Published online:
16
March
2018
Parton showers have become a standard component in the description of high-energy collisions. Nowadays most final-state ones are of the dipole character, wherein a pair of partons branches into three, with energy and momentum preserved inside this subsystem. For initial-state showers a dipole picture is also possible and commonly used, but the older global-recoil strategy remains a valid alternative, wherein larger groups of partons share the energy–momentum preservation task. In this article we introduce and implement a dipole picture also for initial-state radiation in Pythia, and compare with the existing global-recoil one, and with data. For the case of Deeply Inelastic Scattering we can directly compare with matrix element expressions and show that the dipole picture gives a very good description over the whole phase space, at least for the first branching.
© The Author(s), 2018
