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2012

Parton shower evolution with subleading color

Nagy, Zoltán, Soper, Davison E.

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Understand

Parton shower Monte Carlo event generators in which the shower evolves from hard splittings to soft splittings generally use the leading color approximation, which is the leading term in an expansion in powers of $1/N_c^2$, where $N_c = 3$ is the number of colors.

We introduce a more general approximation, the LC+ approximation, that includes some of the color suppressed contributions.
There is a cost: each generated event comes with a weight.
There is a benefit: at each splitting the leading soft$\times$collinear singularity and the leading collinear singularity are treated exactly with respect to color.

Parton shower evolution with subleading color · Around

Built on

Z. Nagy and D. E. Soper, Parton showers with quantum interference: leading color, spin averaged
Original
1917
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G. Marchesini and B. R. Webber, Simulation of QCD Jets Including Soft Gluon Interference
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J. E. Paton and H. M. Chan, Generalized Veneziano model with isospin
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N. Kidonakis and G. F. Sterman, Resummation for QCD hard scattering
1997
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S. Catani and M. H. Seymour, A general algorithm for calculating jet cross sections in NLO QCD
1998
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Then

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