/ hep-ex DESY-14-089


Measurement of Multijet Production in ep Collisions at High Q^2 and Determination of the Strong Coupling alpha_s


Andreev, V. (Lebedev Inst.) ; Baghdasaryan, A. (Yerevan Phys. Inst.) ; Begzsuren, K. (Ulan Bator, Inst. Phys. Tech.) ; Belousov, A. (Lebedev Inst.) ; Belov, P. (DESY) ; Boudry, V. (Ecole Polytechnique) ; Brandt, G. (Liverpool U.) ; Brinkmann, M. (DESY) ; Brisson, V. (Orsay) ; Britzger, D. (DESY) ; Buniatyan, A. (Birmingham U.) ; Bylinkin, A. (Moscow, MIPT) ; Bystritskaya, L. (Moscow, ITEP) ; Campbell, A.J. (DESY) ; Cantun Avila, K.B. (Merida, IPN) ; Ceccopieri, F. (Antwerp U., WISINF) ; Cerny, K. (Charles U.) ; Chekelian, V. (Munich, Max Planck Inst.) ; Contreras, J.G. (Merida, IPN) ; Dainton, J.B. (Liverpool U.) ; Daum, K. (Wuppertal U.) ; Diaconu, C. (Marseille, CPPM) ; Dobre, M. (Bucharest, IFIN-HH) ; Dodonov, V. (DESY) ; Dossanov, A. (Munich, Max Planck Inst.) ; Eckerlin, G. (DESY) ; Egli, S. (PSI, Villigen) ; Elsen, E. (DESY) ; Favart, L. (Antwerp U., WISINF) ; Fedotov, A. (Moscow, ITEP) ; Feltesse, J. (DAPNIA, Saclay) ; Ferencei, J. (Kosice, IEF) ; Fleischer, M. (DESY) ; Fomenko, A. (Lebedev Inst.) ; Gabathuler, E. (Liverpool U.) ; Gayler, J. (DESY) ; Ghazaryan, S. (DESY) ; Glazov, A. (DESY) ; Goerlich, L. (Cracow, INP) ; Gogitidze, N. (Lebedev Inst.) ; Gouzevitch, M. (Lyon, IPN) ; Grab, C. (Zurich, ETH) ; Grebenyuk, A. (Antwerp U., WISINF) ; Greenshaw, T. (Liverpool U.) ; Grindhammer, G. (Munich, Max Planck Inst.) ; Haidt, D. (DESY) ; Henderson, R.C.W. (Lancaster U.) ; Herbst, M. (Heidelberg U.) ; Hladky, J. (Prague, Inst. Phys.) ; Hoffmann, D. (Marseille, CPPM) ; Horisberger, R. (PSI, Villigen) ; Hreus, T. (Antwerp U., WISINF) ; Huber, F. (Heidelberg U.) ; Jacquet, M. (Orsay) ; Janssen, X. (Antwerp U., WISINF) ; Jung, H. (Antwerp U., WISINF) ; Kapichine, M. (Dubna, JINR) ; Kiesling, C. (Munich, Max Planck Inst.) ; Klein, M. (Liverpool U.) ; Kleinwort, C. (DESY) ; Kogler, R. (Hamburg U., Inst. Exp. Phys. II) ; Kostka, P. (Liverpool U.) ; Kretzschmar, J. (Liverpool U.) ; Kruger, K. (DESY) ; Landon, M.P.J. (Queen Mary, U. of London) ; Lange, W. (DESY) ; Laycock, P. (Liverpool U.) ; Lebedev, A. (Lebedev Inst.) ; Levonian, S. (DESY) ; Lipka, K. (Tennessee U.) ; List, B. (DESY) ; List, J. (DESY) ; Lobodzinski, B. (DESY) ; Malinovski, E. (Lebedev Inst.) ; Martyn, H.U. (Aachen, Tech. Hochsch.) ; Maxfield, S.J. (Liverpool U.) ; Mehta, A. (Liverpool U.) ; Meyer, A.B. (DESY) ; Meyer, H. (Wuppertal U., Dept. Math.) ; Meyer, J. (DESY) ; Mikocki, S. (Cracow, INP) ; Morozov, A. (Dubna, JINR) ; Muller, K. (Zurich U.) ; Naumann, Th. (DESY) ; Newman, P.R. (Birmingham U.) ; Niebuhr, C. (DESY) ; Nowak, G. (Cracow, INP) ; Olsson, J.E. (DESY) ; Ozerov, D. (DESY) ; Pahl, P. (DESY) ; Pascaud, C. (Orsay) ; Patel, G.D. (Liverpool U.) ; Perez, E. (CERN) ; Petrukhin, A. (DESY) ; Picuric, I. (Montenegro U.) ; Pirumov, H. (DESY) ; Pitzl, D. (DESY) ; Placakyte, R. (Tennessee U.) ; Pokorny, B. (Charles U.) ; Polifka, R. (Toronto U.) ; Radescu, V. (Tennessee U.) ; Raicevic, N. (Montenegro U.) ; Ravdandorj, T. (Ulan Bator, Inst. Phys. Tech.) ; Reimer, P. (Prague, Inst. Phys.) ; Rizvi, E. (Queen Mary, U. of London) ; Robmann, P. (Zurich U.) ; Roosen, R. (Antwerp U., WISINF) ; Rostovtsev, A. (Moscow, ITEP) ; Rotaru, M. (Bucharest, IFIN-HH) ; Rusakov, S. (Lebedev Inst.) ; Salek, D. (Charles U.) ; Sankey, D.P.C. (Rutherford) ; Sauter, M. (Heidelberg U.) ; Sauvan, E. (Annecy, LAPP) ; Schmitt, S. (DESY) ; Schoeffel, L. (DAPNIA, Saclay) ; Schoning, A. (Heidelberg U.) ; Schultz-Coulon, H.C. (Heidelberg U.) ; Sefkow, F. (DESY) ; Shushkevich, S. (DESY) ; Soloviev, Y. (Lebedev Inst.) ; Sopicki, P. (Cracow, INP) ; South, D. (DESY) ; Spaskov, V. (Dubna, JINR) ; Specka, A. (Ecole Polytechnique) ; Steder, M. (DESY) ; Stella, B. (INFN, Rome) ; Straumann, U. (Zurich U.) ; Sykora, T. (Charles U.) ; Thompson, P.D. (Birmingham U.) ; Traynor, D. (Queen Mary, U. of London) ; Truol, P. (Zurich U.) ; Tsakov, I. (Sofiya, Inst. Nucl. Res.) ; Tseepeldorj, B. (Ulaanbaatar U.) ; Turnau, J. (Cracow, INP) ; Valkarova, A. (Charles U.) ; Vallee, C. (Marseille, CPPM) ; Van Mechelen, P. (Antwerp U., WISINF) ; Vazdik, Y. (Lebedev Inst.) ; Wegener, D. (Dortmund U.) ; Wunsch, E. (DESY) ; Zacek, J. (Charles U.) ; Zhang, Z. (Orsay) ; Zlebcik, R. (Charles U.) ; Zohrabyan, H. (Yerevan Phys. Inst.) ; Zomer, F. (Orsay)

Abstract: Inclusive jet, dijet and trijet differential cross sections are measured in neutral current deep-inelastic scattering for exchanged boson virtualities 150 < Q^2 < 15000 GeV^2 using the H1 detector at HERA. The data were taken in the years 2003 to 2007 and correspond to an integrated luminosity of 351 pb^{-1}. Double differential Jet cross sections are obtained using a regularised unfolding procedure. They are presented as a function of Q^2 and the transverse momentum of the jet, P_T^jet, and as a function of Q^2 and the proton's longitudinal momentum fraction, Xi, 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 Q^2 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 alpha_s(M_Z) = 0.1165 (8)_exp (38)_{pdf,theo}.

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Note: *Temporary entry*; 84 Pages, 22 figure, 40 tables, submitted to EPJC

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