Limits on contact interactions and leptoquarks at HERA

• Main Authors: Abramowicz, H., Abt, I., Adamczyk, L., Adamus, M., Aggarwal, R., Antonelli, S., Aushev, V., Behnke, O., Behrens, U., Bertolin, A., Bloch, I., Brock, I., Brook, N.H., Brugnera, R., Bruni, A., Bussey, P.J., Caldwell, A., Capua, M., Catterall, C.D., Chwastowski, J., Ciborowski, J., Ciesielski, R., Cooper-Sarkar, A.M., Corradi, M., Dementiev, R.K., Devenish, R.C.E., Dusini, S., Ferrando, J., Foster, B., Gallo, E., Garfagnini, A., Geiser, A., Gizhko, A., Gladilin, L.K., Golubkov, Yu. A., Grzelak, G., Gwenlan, C., Hlushchenko, O., Hochman, D., Ibrahim, Zainol Abidin, Iga, Y., Jomhari, N.Z., Kadenko, I., Kananov, S., Karshon, U., Kaur, P., Kisielewska, D., Klanner, R., Klein, U., Korzhavina, I.A., Kotański, A., Kovalchuk, N., Kowalski, H., Krupa, B., Kuprash, O., Kuze, M., Levchenko, B.B., Levy, A., Libov, V., Lisovyi, M., Löhr, B., Lohrmann, E., Longhin, A., Lukina, O. Yu., Makarenko, I., Malka, J., Masciocchi, S., Mohamad Idris, F., Mohammad Nasir, N., Myronenko, V., Nagano, K., Nam, J.D., Nicassio, M., Onderwaater, J., Onishchuk, Yu., Paul, E., Pidhurskyi, I., Pokrovskiy, N.S., Polini, A., Przybycień, M., Quintero, A., Ruspa, M., Saxon, D.H., Schioppa, M., Schneekloth, U., Schörner-Sadenius, T., Selyuzhenkov, I., Shchedrolosiev, M., Shcheglova, L.M., Shyrma, Yu., Skillicorn, I.O., Słomiński, W., Solano, A., Stanco, L., Stefaniuk, N., Stern, A., Stopa, P., Surrow, B., Sztuk-Dambietz, J., Tassi, E., Tokushuku, K., Tomaszewska, J., Tsurugai, T., Turcato, M., Turkot, O., Tymieniecka, T., Verbytskyi, A., Wan Abdullah, Wan Ahmad Tajuddin, Wichmann, K., Wing, M., Yamada, S., Yamazaki, Y., Żarnecki, A.F., Zawiejski, L., Zenaiev, O., Zhautykov, B.O.
• Format: Article
• Published: American Physical Society 2019
• Subjects: Q Science (General); QC Physics
• Online Access: http://eprints.um.edu.my/24287/; https://doi.org/10.1103/PhysRevD.99.092006

High-precision HERA data corresponding to a luminosity of around 1 fb-1 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. © 2019 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the »https://creativecommons.org/licenses/by/4.0/» Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.