, Volume 37, Issue 2, pp 141-159

Measurement of dijet production at low Q 2 at HERA

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Triple differential dijet cross sections in \(e^\pm p\) interactions are presented in the region of photon virtualities 2 < Q 2 < 80 GeV2, inelasticities 0.1 < y < 0.85, jet transverse energies E * T 1 > 7 GeV, E * T 2 > 5 GeV, and pseudorapidities \(-2.5 < \eta^*_1 , \eta^*_2 < 0\) . The measurements are made in the \(\gamma^* p\) centre-of-mass frame, using an integrated luminosity of 57 pb-1. The data are compared with NLO QCD calculations and LO Monte Carlo programs with and without a resolved virtual photon contribution. NLO QCD calculations fail to describe the region of low Q 2 and low jet transverse energies, in contrast to a LO Monte Carlo generator which includes direct and resolved photon interactions with both transversely and longitudinally polarised photons. Initial and final state parton showers are tested as a mechanism for including higher order QCD effects in low E T jet production.

Received: 13 January 2004, Revised: 21 July 2004, Published online: 18 August 2004