https://doi.org/10.1140/epjc/s10052-014-3223-6
Regular Article - Experimental Physics
Measurement of multijet production in collisions at high and determination of the strong coupling
1
I. Physikalisches Institut der RWTH, Aachen, Germany
2
School of Physics and Astronomy, University of Birmingham, Birmingham, UK
3
Inter-University Institute for High Energies ULB-VUB, Brussels and Universiteit Antwerpen, Antwerp, Belgium
4
National Institute for Physics and Nuclear Engineering (NIPNE), Bucharest, Romania
5
STFC, Rutherford Appleton Laboratory, Didcot, Oxfordshire, UK
6
Institute for Nuclear Physics, Kraków, Poland
7
Institut für Physik, TU Dortmund, Dortmund, Germany
8
Joint Institute for Nuclear Research, Dubna, Russia
9
CEA, DSM/Irfu, CE-Saclay, Gif-sur-Yvette, France
10
DESY, Hamburg, Germany
11
Institut für Experimentalphysik, Universität Hamburg, Hamburg, Germany
12
Physikalisches Institut, Universität Heidelberg, Heidelberg, Germany
13
Kirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany
14
Institute of Experimental Physics, Slovak Academy of Sciences, Kosice, Slovak Republic
15
Department of Physics, University of Lancaster, Lancaster, UK
16
Department of Physics, University of Liverpool, Liverpool, UK
17
School of Physics and Astronomy, Queen Mary, University of London, London, UK
18
CPPM, Aix-Marseille University, CNRS/IN2P3, 13288, Marseille, France
19
Departamento de Fisica Aplicada, CINVESTAV, Mérida, Yucatán, Mexico
20
Institute for Theoretical and Experimental Physics, Moscow, Russia
21
Lebedev Physical Institute, Moscow, Russia
22
Max-Planck-Institut für Physik, Munich, Germany
23
LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France
24
LLR, Ecole Polytechnique, CNRS/IN2P3, Palaiseau, France
25
Faculty of Science, University of Montenegro, Podgorica, Montenegro
26
Institute of Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
27
Faculty of Mathematics and Physics, Charles University, Pragua, Czech Republic
28
Dipartimento di Fisica, Università di Roma Tre and INFN Roma 3, Rome, Italy
29
Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgaria
30
Institute of Physics and Technology of the Mongolian Academy of Sciences, Ulaanbaatar, Mongolia
31
Paul Scherrer Institut, Villigen, Switzerland
32
Fachbereich C, Universität Wuppertal, Wuppertal, Germany
33
Yerevan Physics Institute, Yerevan, Armenia
34
DESY, Zeuthen, Germany
35
Institut für Teilchenphysik, ETH, Zurich, Switzerland
36
Physik-Institut der Universität Zürich, Zurich, Switzerland
37
Department of Physics, Oxford University, Oxford, UK
* e-mail: daum@mail.desy.de
Received:
19
June
2014
Accepted:
5
December
2014
Published online:
10
February
2015
Inclusive jet, dijet and trijet differential cross sections are measured in neutral current deep-inelastic scattering for exchanged boson virtualities using the H1 detector at HERA. The data were taken in the years 2003 to 2007 and correspond to an integrated luminosity of . Double differential Jet cross sections are obtained using a regularised unfolding procedure. They are presented as a function of and the transverse momentum of the jet, , and as a function of and the proton’s longitudinal momentum fraction, , carried by the parton participating in the hard interaction. In addition normalised double differential jet cross sections are measured as the ratio of the jet cross sections to the inclusive neutral current cross sections in the respective bins of the jet measurements. Compared to earlier work, the measurements benefit from an improved reconstruction and calibration of the hadronic final state. The cross sections are compared to perturbative QCD calculations in next-to-leading order and are used to determine the running coupling and the value of the strong coupling constant as .
© SIF and Springer-Verlag Berlin Heidelberg, 2015