Limits on contact interactions and leptoquarks at HERA

Abramowicz, H. (Raymond and Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel Aviv University, Tel Aviv, Israel) ; Abt, I. (Max-Planck-Institut für Physik, München, Germany) ; Adamczyk, L. (AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Krakow, Poland) ; Adamus, M. (National Centre for Nuclear Research, Warsaw, Poland) ; Aggarwal, R. (Panjab University, Department of Physics, Chandigarh, India) ; Antonelli, S. (INFN Bologna, Bologna, Italy) ; Aushev, V. (Department of Nuclear Physics, National Taras Shevchenko University of Kyiv, Kyiv, Ukraine) ; Behnke, O. (Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany) ; Behrens, U. (Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany) ; Bertolin, A. (INFN Padova, Padova, Italy) ; Bloch, I. (Deutsches Elektronen-Synchrotron DESY, Zeuthen, Germany) ; Brock, I. (Physikalisches Institut der Universität Bonn, Bonn, Germany) ; Brook, N. H. (Physics and Astronomy Department, University College London, London, United Kingdom) ; Brugnera, R. (Dipartimento di Fisica e Astronomia dell’ Università and INFN, Padova, Italy) ; Bruni, A. (INFN Bologna, Bologna, Italy) ; Bussey, P. J. (School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom) ; Caldwell, A. (Max-Planck-Institut für Physik, München, Germany) ; Capua, M. (Calabria University, Physics Department and INFN, Cosenza, Italy) ; Catterall, C. D. (Department of Physics, York University, Ontario, Canada M3J 1P3) ; Chwastowski, J. (The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Poland) ; Ciborowski, J. (Faculty of Physics, University of Warsaw, Warsaw, Poland) ; Ciesielski, R. (Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany) ; Cooper-Sarkar, A. M. (Department of Physics, University of Oxford, Oxford, United Kingdom) ; Corradi, M. (INFN Bologna, Bologna, Italy) ; Dementiev, R. K. (Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics, Moscow, Russia) ; Devenish, R. C. E. (Department of Physics, University of Oxford, Oxford, United Kingdom) ; Dusini, S. (INFN Padova, Padova, Italy) ; Ferrando, J. (Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany) ; Foster, B. (Hamburg University, Institute of Experimental Physics, Hamburg, Germany) ; Gallo, E. (Hamburg University, Institute of Experimental Physics, Hamburg, Germany) ; Garfagnini, A. (Dipartimento di Fisica e Astronomia dell’ Università and INFN, Padova, Italy) ; Geiser, A. (Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany) ; Gizhko, A. (Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany) ; Gladilin, L. K. (Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics, Moscow, Russia) ; Golubkov, Yu. A. (Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics, Moscow, Russia) ; Grzelak, G. (Faculty of Physics, University of Warsaw, Warsaw, Poland) ; Gwenlan, C. (Department of Physics, University of Oxford, Oxford, United Kingdom) ; Hlushchenko, O. (Department of Nuclear Physics, National Taras Shevchenko University of Kyiv, Kyiv, Ukraine) ; Hochman, D. (Department of Particle Physics and Astrophysics, Weizmann Institute, Rehovot, Israel) ; Ibrahim, Z. A. (National Centre for Particle Physics, Universiti Malaya, 50603 Kuala Lumpur, Malaysia) ; Iga, Y. (Polytechnic University, Tokyo, Japan) ; Jomhari, N. Z. (Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany) ; Kadenko, I. (Department of Nuclear Physics, National Taras Shevchenko University of Kyiv, Kyiv, Ukraine) ; Kananov, S. (Raymond and Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel Aviv University, Tel Aviv, Israel) ; Karshon, U. (Department of Particle Physics and Astrophysics, Weizmann Institute, Rehovot, Israel) ; Kaur, P. (Panjab University, Department of Physics, Chandigarh, India) ; Kisielewska, D. (AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Krakow, Poland) ; Klanner, R. (Hamburg University, Institute of Experimental Physics, Hamburg, Germany) ; Klein, U. (Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany) ; Korzhavina, I. A. (Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics, Moscow, Russia) ; Kotański, A. (Department of Physics, Jagellonian University, Krakow, Poland) ; Kovalchuk, N. (Hamburg University, Institute of Experimental Physics, Hamburg, Germany) ; Kowalski, H. (Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany) ; Krupa, B. (The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Poland) ; Kuprash, O. (Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany) ; Kuze, M. (Department of Physics, Tokyo Institute of Technology, Tokyo, Japan) ; Levchenko, B. B. (Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics, Moscow, Russia) ; Levy, A. (Raymond and Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel Aviv University, Tel Aviv, Israel) ; Libov, V. (Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany) ; Lisovyi, M. (Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany) ; Löhr, B. (Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany) ; Lohrmann, E. (Hamburg University, Institute of Experimental Physics, Hamburg, Germany) ; Longhin, A. (Dipartimento di Fisica e Astronomia dell’ Università and INFN, Padova, Italy) ; Lukina, O. Yu. (Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics, Moscow, Russia) ; Makarenko, I. (Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany) ; Malka, J. (Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany) ; Masciocchi, S. (GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany) ; Mohamad Idris, F. (National Centre for Particle Physics, Universiti Malaya, 50603 Kuala Lumpur, Malaysia) ; Mohammad Nasir, N. (National Centre for Particle Physics, Universiti Malaya, 50603 Kuala Lumpur, Malaysia) ; Myronenko, V. (Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany) ; Nagano, K. (Institute of Particle and Nuclear Studies, KEK, Tsukuba, Japan) ; Nam, J. D. (Department of Physics, Temple University, Philadelphia, Pennsylvania 19122, USA) ; Nicassio, M. (Physikalisches Institut of the University of Heidelberg, Heidelberg, Germany) ; Onderwaater, J. (Physikalisches Institut of the University of Heidelberg, Heidelberg, Germany) ; Onishchuk, Yu. (Department of Nuclear Physics, National Taras Shevchenko University of Kyiv, Kyiv, Ukraine) ; Paul, E. (Physikalisches Institut der Universität Bonn, Bonn, Germany) ; Pidhurskyi, I. (Department of Nuclear Physics, National Taras Shevchenko University of Kyiv, Kyiv, Ukraine) ; Pokrovskiy, N. S. (Institute of Physics and Technology of Ministry of Education and Science of Kazakhstan, Almaty, Kazakhstan) ; Polini, A. (INFN Bologna, Bologna, Italy) ; Przybycień, M. (AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Krakow, Poland) ; Quintero, A. (Department of Physics, Temple University, Philadelphia, Pennsylvania 19122, USA) ; Ruspa, M. (Università del Piemonte Orientale, Novara, and INFN, Torino, Italy) ; Saxon, D. H. (School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom) ; Schioppa, M. (Calabria University, Physics Department and INFN, Cosenza, Italy) ; Schneekloth, U. (Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany) ; Schörner-Sadenius, T. (Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany) ; Selyuzhenkov, I. (GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany) ; Shchedrolosiev, M. (Department of Nuclear Physics, National Taras Shevchenko University of Kyiv, Kyiv, Ukraine) ; Shcheglova, L. M. (Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics, Moscow, Russia) ; Shyrma, Yu. (Institute for Nuclear Research, National Academy of Sciences, Kyiv, Ukraine) ; Skillicorn, I. O. (School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom) ; Słomiński, W. (Department of Physics, Jagellonian University, Krakow, Poland) ; Solano, A. (Università di Torino and INFN, Torino, Italy) ; Stanco, L. (INFN Padova, Padova, Italy) ; Stefaniuk, N. (Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany) ; Stern, A. (Raymond and Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel Aviv University, Tel Aviv, Israel) ; Stopa, P. (The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Poland) ; Surrow, B. (Department of Physics, Temple University, Philadelphia, Pennsylvania 19122, USA) ; Sztuk-Dambietz, J. (Hamburg University, Institute of Experimental Physics, Hamburg, Germany) ; Tassi, E. (Calabria University, Physics Department and INFN, Cosenza, Italy) ; Tokushuku, K. (Institute of Particle and Nuclear Studies, KEK, Tsukuba, Japan) ; Tomaszewska, J. (Faculty of Physics, University of Warsaw, Warsaw, Poland) ; Tsurugai, T. (Meiji Gakuin University, Faculty of General Education, Yokohama, Japan) ; Turcato, M. (Hamburg University, Institute of Experimental Physics, Hamburg, Germany) ; Turkot, O. (Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany) ; Tymieniecka, T. (National Centre for Nuclear Research, Warsaw, Poland) ; Verbytskyi, A. (Max-Planck-Institut für Physik, München, Germany) ; Wan Abdullah, W. A. T. (National Centre for Particle Physics, Universiti Malaya, 50603 Kuala Lumpur, Malaysia) ; Wichmann, K. (Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany) ; Wing, M. (Physics and Astronomy Department, University College London, London, United Kingdom) ; Yamada, S. (Institute of Particle and Nuclear Studies, KEK, Tsukuba, Japan) ; Yamazaki, Y. (Institute of Particle and Nuclear Studies, KEK, Tsukuba, Japan) ; Żarnecki, A. F. (Faculty of Physics, University of Warsaw, Warsaw, Poland) ; Zawiejski, L. (The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Poland) ; Zenaiev, O. (Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany) ; Zhautykov, B. O. (Institute of Physics and Technology of Ministry of Education and Science of Kazakhstan, Almaty, Kazakhstan)

29 May 2019

Abstract: High-precision HERA data corresponding to a luminosity of around 1 fb1 have been used in the framework of eeqq contact interactions (CI) to set limits on possible high-energy contributions beyond the Standard Model to electron-quark scattering. Measurements of the inclusive deep inelastic cross sections in neutral and charged current ep scattering were considered. The analysis of the ep data has been based on simultaneous fits of parton distribution functions including contributions of CI couplings to ep scattering. Several general CI models and scenarios with heavy leptoquarks were considered. Improvements in the description of the inclusive HERA data were obtained for a few models. Since a statistically significant deviation from the Standard Model cannot be established, limits in the TeV range were set on all models considered.


Published in: Physical Review D 99 (2019)
Published by: APS
DOI: 10.1103/PhysRevD.99.092006
arXiv: 1902.03048
License: CC-BY-4.0



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