Built on

T. Sjöstrand, A Model for Initial State Parton Showers
1985
Earlier work this paper cites.
R. K. Ellis and J. C. Sexton, Explicit Formulae for Heavy Flavor Production
1987
Earlier work this paper cites.
G. Marchesini and B. R. Webber, Simulation of QCD coherence in heavy quark production and decay
1990
Earlier work this paper cites.
S. Catani and M. H. Seymour, A General algorithm for calculating jet cross-sections in NLO QCD
1997
Earlier work this paper cites.
J. H. Kuhn and G. Rodrigo, Charge asymmetry in hadroproduction of heavy quarks
1998
Earlier work this paper cites.
J. H. Kuhn and G. Rodrigo, Charge asymmetry of heavy quarks at hadron colliders
1999
Earlier work this paper cites.
G. Miu and T. Sjöstrand, W W production in an improved parton shower approach
1999
Earlier work this paper cites.
S. Frixione and B. R. Webber, Matching NLO QCD computations and parton shower simulations
2002
Earlier work this paper cites.
A. D. Martin, R. G. Roberts, W. J. Stirling, and R. S. Thorne, NNLO global parton analysis
2002
Earlier work this paper cites.
S. Frixione, P. Nason, and B. R. Webber, Matching NLO QCD and parton showers in heavy flavour production
2003
Earlier work this paper cites.
S. Gieseke, P. Stephens, and B. R. Webber, New formalism for QCD parton showers
2003
Earlier work this paper cites.
P. Nason, A New method for combining NLO QCD with shower Monte Carlo algorithms
2004
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T. Sjöstrand and P. Z. Skands, Transverse-momentum-ordered showers and interleaved multiple interactions
2005
Earlier work this paper cites.

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2012

QCD Coherence and the Top Quark Asymmetry

Skands, Peter Z., Webber, Bryan R., Winter, Jan

Understand

Coherent QCD radiation in the hadroproduction of top quark pairs leads to a forward--backward asymmetry that grows more negative with increasing transverse momentum of the pair.

This feature is present in Monte Carlo event generators with coherent parton showering, even though the production process is treated at leading order and has no intrinsic asymmetry before showering.
In addition, depending on the treatment of recoils, showering can produce a positive contribution to the inclusive asymmetry.
We explain the origin of these features, compare them in fixed-order calculations and the Herwig++, Pythia and Sherpa event generators, and discuss their implications.

Built on

T. Sjöstrand, A Model for Initial State Parton Showers
1985
Earlier work this paper cites.
R. K. Ellis and J. C. Sexton, Explicit Formulae for Heavy Flavor Production
1987
Earlier work this paper cites.
G. Marchesini and B. R. Webber, Simulation of QCD coherence in heavy quark production and decay
1990
Earlier work this paper cites.
S. Catani and M. H. Seymour, A General algorithm for calculating jet cross-sections in NLO QCD
1997
Earlier work this paper cites.
J. H. Kuhn and G. Rodrigo, Charge asymmetry in hadroproduction of heavy quarks
1998
Earlier work this paper cites.
J. H. Kuhn and G. Rodrigo, Charge asymmetry of heavy quarks at hadron colliders
1999
Earlier work this paper cites.
G. Miu and T. Sjöstrand, W W production in an improved parton shower approach
1999
Earlier work this paper cites.
S. Frixione and B. R. Webber, Matching NLO QCD computations and parton shower simulations
2002
Earlier work this paper cites.
A. D. Martin, R. G. Roberts, W. J. Stirling, and R. S. Thorne, NNLO global parton analysis
2002
Earlier work this paper cites.
S. Frixione, P. Nason, and B. R. Webber, Matching NLO QCD and parton showers in heavy flavour production
2003
Earlier work this paper cites.
S. Gieseke, P. Stephens, and B. R. Webber, New formalism for QCD parton showers
2003
Earlier work this paper cites.
P. Nason, A New method for combining NLO QCD with shower Monte Carlo algorithms
2004
Earlier work this paper cites.
T. Sjöstrand and P. Z. Skands, Transverse-momentum-ordered showers and interleaved multiple interactions
2005
Earlier work this paper cites.