The European Physical Journal C - Particles and Fields

, Volume 37, Issue 2, pp 141–159

Measurement of dijet production at low Q2 at HERA

  • Authors
  • The H1 Collaboration
experimental physics

DOI: 10.1140/epjc/s2004-01989-7

Cite this article as:
The H1 Collaboration Eur. Phys. J. C (2004) 37: 141. doi:10.1140/epjc/s2004-01989-7


Triple differential dijet cross sections in \(e^\pm p\) interactions are presented in the region of photon virtualities 2 < Q2 < 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 Q2 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 ET jet production.

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© Springer-Verlag Berlin/Heidelberg 2004