Eur. Phys. J. C (2018) 78: 777
https://doi.org/10.1140/epjc/s10052-018-6236-8

Regular Article - Experimental Physics

Determination of electroweak parameters in polarised deep-inelastic scattering at HERA

H1 Collaboration and H. Spiesberger (Mainz)

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 Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering (IFIN-HH), Bucharest, Romania
⁵ Rutherford Appleton Laboratory, STFC, Didcot, Oxfordshire, UK
⁶ Institute of Nuclear Physics, Polish Academy of Sciences, 31342, Kraków, Poland
⁷ Institut für Physik, TU Dortmund, Dortmund, Germany
⁸ Joint Institute for Nuclear Research, Dubna, Russia
⁹ Irfu/SPP, 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 Department of Physics, University of Lancaster, Lancaster, UK
¹⁴ Department of Physics, University of Liverpool, Liverpool, UK
¹⁵ School of Physics and Astronomy, Queen Mary, University of London, London, UK
¹⁶ Aix Marseille Université, CNRS/IN2P3, CPPM UMR 7346, 13288, Marseille, France
¹⁷ Departamento de Fisica Aplicada, CINVESTAV, Mérida, Yucatán, Mexico
¹⁸ Institute for Theoretical and Experimental Physics, Moscow, Russia
¹⁹ Lebedev Physical Institute, Moscow, Russia
²⁰ Max-Planck-Institut für Physik, Munich, Germany
²¹ LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France
²² LLR, Ecole Polytechnique, CNRS/IN2P3, Palaiseau, France
²³ Faculty of Science, University of Montenegro, Podgorica, Montenegro
²⁴ Institute of Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
²⁵ Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
²⁶ Dipartimento di Fisica, Università di Roma Tre and INFN Roma 3, Rome, Italy
²⁷ Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgaria
²⁸ Institute of Physics and Technology of the Mongolian Academy of Sciences, Ulaanbaatar, Mongolia
²⁹ Paul Scherrer Institute, Villigen, Switzerland
³⁰ Fachbereich C, Universität Wuppertal, Wuppertal, Germany
³¹ Yerevan Physics Institute, Yerevan, Armenia
³² DESY, Zeuthen, Germany
³³ Institut für Teilchenphysik, ETH, Zurich, Switzerland
³⁴ Physik-Institut der Universität Zürich, Zurich, Switzerland
³⁵ Université Claude Bernard Lyon 1, CNRS/IN2P3, Villeurbanne, France
³⁶ Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, Russia
³⁷ CERN, Geneva, Switzerland
³⁸ Ulaanbaatar University, Ulaanbaatar, Mongolia
³⁹ LAPP, Université de Savoie, CNRS/IN2P3, Annecy-le-Vieux, France
⁴⁰ II. Physikalisches Institut, Universität Göttingen, Göttingen, Germany
⁴¹ Institute for Information Transmission Problems RAS, Moscow, Russia
⁴² Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region, Russian Federation
⁴³ Department of Physics and Astronomy, Purdue University, 525 Northwestern Ave, West Lafayette, IN, 47907, USA
⁴⁴ Department of Physics, Oxford University, Oxford, UK
⁴⁵ PRISMA Cluster of Excellence, Institute of Physics, Johannes Gutenberg-Universität, Mainz, Germany

^* e-mail: sschmitt@mail.desy.de

Received: 5 June 2018
Accepted: 10 September 2018
Published online: 26 September 2018

Abstract

The parameters of the electroweak theory are determined in a combined electroweak and QCD analysis using all deep-inelastic and neutral current and charged current scattering cross sections published by the H1 Collaboration, including data with longitudinally polarised lepton beams. Various fits to Standard Model parameters in the on-shell scheme are performed. The mass of the W boson is determined as . The axial-vector and vector couplings of the light quarks to the Z boson are also determined. Both results improve the precision of previous H1 determinations based on HERA-I data by about a factor of two. Possible scale dependence of the weak coupling parameters in both neutral and charged current interactions beyond the Standard Model is also studied. All results are found to be consistent with the Standard Model expectations.