Some remarks on dipole showers and the DGLAP equation

Peter Skands; Stefan Weinzierl

doi:10.1103/PhysRevD.79.074021

Some remarks on dipole showers and the DGLAP equation

Peter Skands
, Stefan Weinzierl

Research output: Contribution to journal › Article › Research › peer-review

21 Citations (Scopus)

Abstract

It has been argued recently that parton showers based on color dipoles conflict with collinear factorization and do not lead to the correct Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) equation. We show that this conclusion is based on an inappropriate assumption, namely, the choice of the gluon energy as evolution variable. We further show numerically that Monte-Carlo programs based on dipole showers with "infrared-sensible" evolution variables reproduce the DGLAP equation both in asymptotic form as well as in comparison to the leading behavior of second-order QCD matrix elements.

Original language	English
Article number	074021
Journal	Physical Review D
Volume	79
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevD.79.074021
Publication status	Published - 1 Apr 2009
Externally published	Yes

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10.1103/PhysRevD.79.074021

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AB - It has been argued recently that parton showers based on color dipoles conflict with collinear factorization and do not lead to the correct Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) equation. We show that this conclusion is based on an inappropriate assumption, namely, the choice of the gluon energy as evolution variable. We further show numerically that Monte-Carlo programs based on dipole showers with "infrared-sensible" evolution variables reproduce the DGLAP equation both in asymptotic form as well as in comparison to the leading behavior of second-order QCD matrix elements.

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Some remarks on dipole showers and the DGLAP equation

Abstract

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