Measurement of Multijet Production in ep collisions at Low Q^2 at HERA

Reference April 2016
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Contact D. Britzger
Abstract The production of jets is studied in neutral current deep-inelastic scattering for photon negative four-momentum-transfer squared 5<Q2<100 GeV2 and inelasticity 0.2<y<0.65, using HERA data taken by the H1 detector in the years 2006 and 2007, corresponding to an integrated luminosity of 184 pb-1. Jets are defined in the Breit frame using the inclusive kT cluster algorithm and have a minimum jet transverse momentum PT of 5 GeV and a pseudorapidity in the laboratory frame of -1.0<ηlab<2.5. Inclusive jet cross sections are obtained as a function of Q2 and PT in the range 5<PT<45 GeV. Dijet and trijet cross sections are obtained as a function of Q2 and the average transverse momentum of the two leading jets ⟨PT⟩ in the range 5<⟨PT⟩<45 GeV with an additional requirement on the invariant mass of the two leading jets of Mjj<16 GeV. The data are corrected for acceptance and resolution effects using a regularised unfolding procedure. The measured cross sections are compared to next-to-leading order QCD predictions using NNPDF3.0 PDF set, where an overall good agreement is found.
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