Soft gluons and superleading logarithms in QCD
arXiv:0901.3037 · doi:10.1016/j.nuclphysbps.2009.03.133
Abstract
After a brief introduction to the physics of soft gluons in QCD we present a surprising prediction. Dijet production in hadron-hadron collisions provides the paradigm, i.e. h_1 +h_2 \to jj+X. In particular, we look at the case where there is a restriction placed on the emission of any further jets in the region in between the primary (highest p_T) dijets. Logarithms in the ratio of the jet scale to the veto scale can be summed to all orders in the strong coupling. Surprisingly, factorization of collinear emissions fails at scales above the veto scale and triggers the appearance of double logarithms in the hard sub-process. The effect appears first at fourth order relative to the leading order prediction and is subleading in the number of colours.
Talk presented at the workshop "New Trends in HERA Physics", Ringberg Castle, Tegernsee, 5-10 October 2008
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- Space-like (vs. time-like) collinear limits in QCD: is factorization violated?
- An Effective Field Theory for Forward Scattering and Factorization Violation
- On the breaking of collinear factorization in QCD
- Color structure for soft gluon resummation - a general recipe
- Searching for the triplet Higgs sector via central exclusive production at the LHC