Some dipole shower studies

Baptiste Cabouat, Torbjörn Sjöstrand

    Research output: Contribution to journalArticlepeer-review


    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.

    Original languageEnglish
    Article number226
    JournalEuropean Physical Journal C
    Issue number3
    Early online date16 Mar 2018
    Publication statusE-pub ahead of print - 16 Mar 2018


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