Journal
EUROPEAN PHYSICAL JOURNAL C
Volume 78, Issue 3, Pages -Publisher
SPRINGER
DOI: 10.1140/epjc/s10052-018-5645-z
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Funding
- Swedish Research Council [621-2013-4287, 2016-05996]
- European Research Council (ERC) under the European Union's Horizon research and innovation programme [668679]
- MCnetITN3 H Marie Curie Initial Training Network [722104]
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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.
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