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# Measurement of dijet production at low $D^2$ at HERA

Abstract : Triple differential dijet cross sections in e^\pm p interactions are presented in the region of photon virtualities 25GeV, 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 57pb^-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.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00023183
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Submitted on : Friday, October 8, 2004 - 10:32:32 AM
Last modification on : Monday, March 28, 2022 - 9:39:14 AM

### Citation

A. Aktas, V. Andreev, T. Anthonis, A. Asmone, A. Babaev, et al.. Measurement of dijet production at low $D^2$ at HERA. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2004, 37, pp.141-159. ⟨in2p3-00023183⟩

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