Abstract
A precision measurement of jet cross sections in neutral current deep-inelastic scattering for photon virtualities 5.5<Q^2 <80,mathrm {GeV}^2 and inelasticities 0.2<y<0.6 is presented, using data taken with the H1 detector at HERA, corresponding to an integrated luminosity of 290,mathrm {pb}^{-1}. Double-differential inclusive jet, dijet and trijet cross sections are measured simultaneously and are presented as a function of jet transverse momentum observables and as a function of Q^2. Jet cross sections normalised to the inclusive neutral current DIS cross section in the respective Q^2-interval are also determined. Previous results of inclusive jet cross sections in the range 150<Q^2 <15{,}000,mathrm {GeV}^2 are extended to low transverse jet momenta 5<P_mathrm{T}^mathrm{jet} <7,mathrm {GeV} . The data are compared to predictions from perturbative QCD in next-to-leading order in the strong coupling, in approximate next-to-next-to-leading order and in full next-to-next-to-leading order. Using also the recently published H1 jet data at high values of Q^2, the strong coupling constant alpha _s(M_Z) is determined in next-to-leading order.
Highlights
Jet production in neutral current (NC) deep-inelastic scattering (DIS) at HERA is an important process to test perturbative calculations based on the theory of strong interactions, which is described by Quantum Chromodynamics (QCD) [1–5]
The absolute and normalised jet cross sections are compared to theoretical predictions in next-to-leading order (NLO), approximate next-to-next-to-leading order and full NNLO in perturbative QCD (pQCD)
The new low-PTjet inclusive jet cross sections at high-Q2 are underestimated by the NLO and approximate next-to-next-to-leading order (aNNLO) predictions, while the NNLO predictions give a good description of these new data points
Summary
Physikalisches Institut der RWTH, Aachen, Germany 2 School of Physics and Astronomy, University of Birmingham, Birmingham, UKb 3 Inter-University Institute for High Energies ULB-VUB, Brussels and Universiteit Antwerpen, Antwerp, Belgiumc 4 Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering (IFIN-HH), Bucharest, Romaniai 5 Rutherford Appleton Laboratory, STFC, Didcot, Oxfordshire, UKb 6 Institute of Nuclear Physics, Polish Academy of Sciences, Kraków, Polandd 7 Institut für Physik, TU Dortmund, Dortmund, Germanya 8 Joint Institute for Nuclear Research, Dubna, Russia 9 Irfu/SPP, CE Saclay, Gif-sur-Yvette, France DESY, Hamburg, Germany Institut für Experimentalphysik, Universität Hamburg, Hamburg, Germanya Physikalisches Institut, Universität Heidelberg, Heidelberg, Germanya Department of Physics, University of Lancaster, Liverpool, UKb Department of Physics, University of Liverpool, Liverpool, UKb School of Physics and Astronomy, Queen Mary, University of London, London, UKb Aix Marseille Université, CNRS/IN2P3, CPPM UMR 7346, 13288 Marseille, France Departamento de Fisica Aplicada, CINVESTAV, Mérida, Yucatán, Mexicog Institute for Theoretical and Experimental Physics, Moscow, Russiah Lebedev Physical Institute, Moscow, Russia Max-Planck-Institut für Physik, Munich, Germany LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France LLR, Ecole Polytechnique, CNRS/IN2P3, Palaiseau, France Faculty of Science, University of Montenegro, Podgorica, Montenegroj Institute of Physics, Academy of Sciences of the Czech Republic, Praha, Czech Republice Faculty of Mathematics and Physics, Charles University, Praha, Czech Republice Dipartimento di Fisica Università di Roma Tre and INFN Roma 3, Rome, Italy Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgaria Institute of Physics and Technology of the Mongolian, Academy of Sciences, Ulaanbaatar, Mongolia Paul Scherrer Institute, Villigen, Switzerland.
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