Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-08-04
Phys.Lett. B414 (1997) 205-209
Physics
High Energy Physics
High Energy Physics - Phenomenology
Latex, 7 pages, 2 figures. The complete paper, including figures, is also available via anonymous ftp at ftp://ttpux2.physik.u
Scientific paper
10.1016/S0370-2693(97)01183-0
A Monte Carlo study of the azimuthal angular distribution around the virtual boson-proton beam axis for dijet events in DIS at HERA is presented. In the presence of typical acceptance cuts on the jets in the laboratory frame, the azimuthal distribution is dominated by kinematic effects rather than the typical $\cos\phi$ and $\cos 2\phi$ dependence predicted by the QCD matrix elements. This implies that the $\phi$ dependent part of the QCD matrix elements contributes even to the dijet production cross section. Neglecting this $\phi$ dependence leads to an error of about 5-8\% in the production cross section for typical acceptance cuts in the laboratory frame. We also present first NLO results on the $\phi$-decorrelation of the jets through NLO effects.
Mirkes Erwin
Willfahrt Stefan
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