Determination of the strong coupling constant αs(mZ) in next-to-next-to-leading order QCD using H1 jet cross section measurements: H1 Collaboration

V. Andreev, A. Baghdasaryan, K. Begzsuren, A. Belousov, V. Bertone, A. Bolz, V. Boudry, G. Brandt, V. Brisson, D. Britzger, A. Buniatyan, A. Bylinkin, L. Bystritskaya, A. J. Campbell, K. B. Cantun Avila, K. Cerny, V. Chekelian, J. G. Contreras, J. Cvach, J. CurrieJ. B. Dainton, K. Daum, C. Diaconu, M. Dobre, V. Dodonov, G. Eckerlin, S. Egli, E. Elsen, L. Favart, A. Fedotov, J. Feltesse, M. Fleischer, A. Fomenko, E. Gabathuler, J. Gayler, T. Gehrmann, S. Ghazaryan, L. Goerlich, N. Gogitidze, M. Gouzevitch, C. Grab, A. Grebenyuk, T. Greenshaw, G. Grindhammer, C. Gwenlan, D. Haidt, R. C.W. Henderson, J. Hladkỳ, D. Hoffmann, R. Horisberger, T. Hreus, F. Huber, A. Huss, M. Jacquet, X. Janssen, A. W. Jung, H. Jung, M. Kapichine, J. Katzy, C. Kiesling, M. Klein, C. Kleinwort, R. Kogler, P. Kostka, J. Kretzschmar, D. Krücker, K. Krüger, M. P.J. Landon, W. Lange, P. Laycock, A. Lebedev, S. Levonian, K. Lipka, B. List, J. List, B. Lobodzinski, E. Malinovski, H. U. Martyn, S. J. Maxfield, A. Mehta, A. B. Meyer, H. Meyer, J. Meyer, S. Mikocki, A. Morozov, K. Müller, Th Naumann, P. R. Newman, C. Niebuhr, J. Niehues, G. Nowak, J. E. Olsson, D. Ozerov, C. Pascaud, G. D. Patel, E. Perez, A. Petrukhin, I. Picuric, H. Pirumov, D. Pitzl, R. Plačakytė, R. Polifka, K. Rabbertz, V. Radescu, N. Raicevic, T. Ravdandorj, P. Reimer, E. Rizvi, P. Robmann, R. Roosen, A. Rostovtsev, M. Rotaru, D. Šálek, D. P.C. Sankey, M. Sauter, E. Sauvan, S. Schmitt*, L. Schoeffel, A. Schöning, F. Sefkow, S. Shushkevich, Y. Soloviev, P. Sopicki, D. South, V. Spaskov, A. Specka, M. Steder, B. Stella, U. Straumann, M. R. Sutton, T. Sykora, P. D. Thompson, D. Traynor, P. Truöl, I. Tsakov, B. Tseepeldorj, A. Valkárová, C. Vallée, P. Van Mechelen, Y. Vazdik, D. Wegener, E. Wünsch, J. ek, Z. Zhang, R. Žlebčík, H. Zohrabyan, F. Zomer

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review


The strong coupling constant αs is determined from inclusive jet and dijet cross sections in neutral-current deep-inelastic ep scattering (DIS) measured at HERA by the H1 collaboration using next-to-next-to-leading order (NNLO) QCD predictions. The dependence of the NNLO predictions and of the resulting value of αs(mZ) at the Z-boson mass mZ are studied as a function of the choice of the renormalisation and factorisation scales. Using inclusive jet and dijet data together, the strong coupling constant is determined to be αs(mZ)=0.1157(20)exp(29)th. Complementary, αs(mZ) is determined together with parton distribution functions of the proton (PDFs) from jet and inclusive DIS data measured by the H1 experiment. The value αs(mZ)=0.1142(28)tot obtained is consistent with the determination from jet data alone. The impact of the jet data on the PDFs is studied. The running of the strong coupling is tested at different values of the renormalisation scale and the results are found to be in agreement with expectations.

Original languageEnglish
Article number791
JournalEuropean Physical Journal C
Issue number11
Publication statusPublished - 1 Nov 2017


Acknowledgements We are grateful to the HERA machine group whose outstanding efforts have made this experiment possible. We thank the engineers and technicians for their work in constructing and maintaining the H1 detector, our funding agencies for financial support, the DESY technical staff for continual assistance and the DESY directorate for support and for the hospitality which they extend to the non-DESY members of the collaboration. We would like to give credit to all partners contributing to the EGI computing infrastructure for their support for the H1 collaboration. We express our thanks to all those involved in securing not only the H1 data but also the software and working environment for long term use allowing the unique H1 data set to continue to be explored in the coming years. The transfer from experiment specific to central resources with long term support, including both storage and batch systems has also been crucial to this enterprise. We therefore also acknowledge the role played by DESY-IT and all people involved during this transition and their future role in the years to come. This research was supported by the Swiss National Science Foundation (SNF) under Contracts 200020-162487 and CRSII2-160814, in part by the UK Science and Technology Facilities Council as well as by the Research Executive Agency (REA) of the European Union under the Grant Agreement PITN-GA-2012-316704 (“HiggsTools”) and the ERC Advanced Grant MC@NNLO (340983). We gratefully express our thanks for support from the Institute for Particle Physics Phenomenology Durham (IPPP), in the form of an IPPP Associateship. Dedicated to the memory of our dear friends and colleagues Vitaliy Dodonov and Yakov Vazdik † Deceased ★ Contributing author providing theory predictions or infrastructure a e-mail: bSupported by the Bundesministerium für Bildung und Forschung, FRG, under Contract numbers 05H09GUF, 05H09VHC, 05H09VHF, 05H16PEA cSupported by the UK Science and Technology Facilities Council, and formerly by the UK Particle Physics and Astronomy Research Council dSupported by FNRS-FWO-Vlaanderen, IISN-IIKW and IWT and by Interuniversity Attraction Poles Programme, Belgian Science Policy e Partially Supported by Polish Ministry of Science and Higher Edu-cation, Grant DPN/N168/DESY/2009 f Supported by the Ministry of Education of the Czech Republic under the Project INGO-LG14033 g Supported by the Swiss National Science Foundation h Supported by CONACYT, México, Grant 48778-F iRussian Foundation for Basic Research (RFBR), Grant no. 1329.2008.2 and Rosatom jSupported by the Romanian National Authority for Scientific Research under the contract PN 09370101 k Partially Supported by Ministry of Science of Montenegro, no. 05-1/3-3352 l Russian Foundation for Sciences, Project no. 14-50-00150 mMinistry of Education and Science of Russian Federation contract no. 02.A03.21.0003

FundersFunder number
Education and Science of Russian Federation
FRG05H09GUF, 05H09VHF, 05H09VHC
Ministry of Science and Higher Edu-cationDPN/N168/DESY/2009
Ministry of Science of Montenegro05-1/3-3352
Swiss National Science Foundation h Supported
Seventh Framework Programme316704, 340983
Science and Technology Facilities Council
European CommissionPITN-GA-2012-316704
European Research Council
Research Executive Agency
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen ForschungCRSII2-160814, 200020-162487
Ministerstvo Školství, Mládeže a TělovýchovyINGO-LG14033
Russian Foundation for Basic Research1329.2008.2
Bundesministerium für Bildung und Forschung
Agentschap voor Innovatie door Wetenschap en Technologie
Consejo Nacional de Ciencia y Tecnología
Institute for Particle Physics Phenomenology, Durham University
Autoritatea Natională pentru Cercetare StiintificăPN 09370101
Russian Science Foundation14-50-00150 mMinistry
iRussian Foundation for Basic Research


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