Abstract
Measurements of jet cross sections in neutral current deep-inelastic scattering (NC DIS) using data taken with the H1 detector at HERA are accomplished by the precision measurement of double-differential inclusive jet, dijet and trijet cross sections at low photon virtualities 5.5 < Q2 < 80 GeV2, and by extending previous inclusive jet measurements in the range 150 < Q2 < 15000 GeV2 to low transverse jet momenta 5 < PT < 7 GeV. The strong coupling constant at the Z-boson mass, αs(mZ), is determined in next-to-next-to-leading order (NNLO) QCD using H1 inclusive jet and dijet cross section measurements. Complementary, αs(mZ) is determined together with parton distribution functions of the proton (PDFs) from jet and inclusive DIS data measured by the H1 experiment. The running of the strong coupling is tested at different values of the renormalisation scale and the results are found to be in agreement with the QCD expectations.
Highlights
Jet production in neutral current deep-inelastic scattering (NC DIS) at HERA is an important process to test perturbative calculations based on Quantum Chromodynamics (QCD), the theory of strong interactions
Measurements of the inclusive jet, dijet and trijet cross sections in NC DIS at HERA in the H1 experiment are accomplished by measurements at low Q2 in the range 5.5 < Q2 < 80 GeV2 and by an extention of inclusive jet measurements at 150 < Q2 < 15 000 GeV2 to low jet transverse momenta of 5 < PjTet < 7 GeV
The jet cross sections normalised to the inclusive NC DIS cross sections are obtained
Summary
Jet production in neutral current deep-inelastic scattering (NC DIS) at HERA is an important process to test perturbative calculations based on Quantum Chromodynamics (QCD), the theory of strong interactions. The last piece of this scientific program [1], an extension of the measured range to low negative four-momentum transfer squared, 5.5 < Q2 < 80 GeV2, and, for previous inclusive jet measurements in the range 150 < Q2 < 15000 GeV2 [3], to low transverse jet momenta 5 < PT < 7 GeV, is presented here together with the first determination [2] of the strong coupling constant at the Z-boson mass, αs(mZ), which is making use of recent calculations of jet production at next-to-next-to-leading order in QCD (NNLO) [4,5,6,7], applied to the H1 jet data These NNLO calculations are used for the first time for the determination of parton distribution functions of the proton (PDFs). The aNNLO predictions provide a reasonable description of the shape of the PjTet-distributions
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