# Changes between Initial Version and Version 1 of GluonSpin

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Timestamp:
03/20/12 16:16:53 (8 years ago)
Comment:

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 v1 == The BZ angle in e+ e-  -> 4jets: abelian vs non-abelian == Use MadGraph/MadEvent to produce two event samples, one for standard QCD and one with an abelian QCD model for Run the collision on the peak of the Z boson and set a minimum invariant mass for the jets of %$m_{jj}>10$% GeV. Plot the Bengtsson-Zerwas angle between the planes identified by the two lowest and to highest energy jets: %$\cos \chi_{BZ} = \frac{( {\bf p}''1\times {\bf p}''2) \cdot ({\bf p}''3\times {\bf p}''4)} {||{\bf p}''1 \times {\bf p}''2 || ||{\bf p}''3\times {\bf p}''4||}\,.$% Comparison should be made with the plots of Ref. [http://arxiv.org/abs/hep-ph/9503354 hep-ph/9503354], where various implementation of the abelian models are discussed. Our web implementation include the emission of abelian gluons as possible partons leading to jets. -- Main.FabioMaltoni - 29 Aug 2007