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1. Determination of the strong coupling constant from jet rates in deep inelastic scattering

Author

E. Evrard, F. Kole, T. P. Yiou, U. Bassler, B. Gonzalez-Pineiro, P. Ribarics, Armen Vartapetian, J. Garvey, B. Delcourt, R. Felst, A. M. Fomenko, M. Colombo, C. Leverenz, S. Tapprogge, A. Droutskoi, W.D. Dau, J. B. Dainton, R. L. Lander, Peter Robmann, Murrough Landon, A. E. Wright, C. A. Meyer, K. H. Hiller, H. U. Martyn, L. Del Buono, M. Htte, C. Vallée, A. Gruber, S. Eichenberger, R. Nahnhauer, K. Stephens, E. Peppel, P. E. Reimer, C. Cormack, Alan Campbell, N. Magnussen, R. D. Appuhn, N. Sahlmann, E. Schuhmann, E. Barrelet, David Cussans, M. A. Jabiol, E. A. De Wolf, Ch. Berger, H. Itterbeck, P. Van Mechelen, H. Erlichmann, E. M. Hanlon, C. Niebuhr, S. Aid, G. G. Winter, K. Mller, M. Kuhlen, F. Botterweck, A. Mavroidis, F. Charles, E. Eisenhandler, S. Egli, T. Jansen, G. Grindhammer, M. Nyberg-Werther, P. Steffen, U. Krner-Marquis, G. Cozzika, F. Eisele, D. Goldner, D. Krcker, M. F. Hess, E. Prez, J. Kurzhfer, R. Taylor, E. Snchez, I. Herynek, J.P. Phillips, S. Mani, H. P. Beck, Stephen Burke, O. Hamon, V. Schrder, H. Rick, M. Vecko, C. Gruber, H. Grssler, M. Hampel, B. Kuznik, J. Turnau, M. Korn, R. Starosta, Stephen Maxfield, Hannes Jung, Steve McMahon, S. Levonian, A. Gellrich, D. Mercer, M. Steenbock, Paul Richard Newman, Grzegorz Nowak, C. Jacobsson, I. W. Walker, K. Daum, D. Zarbock, Alexander Zhokin, H. P. Wellisch, Ph. Huet, Max Weber, R. J. Ellison, G. Mller, Christoph Grab, Ch. Pichler, S. Prell, G. Weber, U. Straumann, F. Lamarche, M. Wagener, S. Masson, U. Seehausen, F. Sefkow, T. Carli, B. Andrieu, J. Stiewe, A. Lindner, J. Janoth, M. Burton, G. Knies, P. Trul, A. B. Clegg, R. Rylko, K. Rosenbauer, K. Flamm, V. Chernyshov, M. Hppner, S. Schiek, G. Flgge, Andrew Mehta, D. Kant, J. Feltesse, T. R. Ebert, F. Linsel, Hermann Kolanoski, K. C. Hoeger, T.C. Nicholls, G. Siegmon, R. Kaschowitz, K. Johannsen, P. Verrecchia, Christophe Royon, O. Dnger, D. Clarke, Tim Greenshaw, Roland Horisberger, F. Zomer, A. Fedotov, M. Jaffré, Volker Blobel, Kerstin Borras, A. Semenov, N. Gogitidze, J. Haack, C. Keuker, Zhen Zhang, J. Heatherington, H. H. Kaufmann, S. Riess, G. Thompson, R. Beyer, K. Rter, U. Kathage, John A Coughlan, Max Klein, Horst Oberlack, V. Riech, D. Newton, F. Moreau, S. Valkr, P. Baranov, E. Malinovskii, B. Naroska, P. I. P. Kalmus, I. O. Skillicorn, H. B. Dreis, Peter Schleper, J. Buerger, J. D. Dowell, G C. Lpez, Yu. Solovev, J. Formnek, E. Gabathuler, C. Schmidt, J. P. Sutton, P. Di Nezza, Winston Ko, M. Hapke, F. Brasse, F W. Bsser, P. Hill, J. Bán, B. Stella, J. Khne, T. Krmerkmper, R. Buchholz, Daniel Pitzl, A. Jacholkowska, C. Pascaud, B. Schwab, A. Braemer, V. Lubimov, E. Wnsch, P. Lanius, E. Mroczko, Guenter Eckerlin, V. Brisson, Wolfgang Lange, Marc Besancon, David Milstead, Benno List, A.S. Belousov, P. A. Smirnov, K. Meier, H. J. Behrend, J.C. Bizot, Barbara Clerbaux, Mikhail Danilov, Judith Katzy, Carl R. Brune, M. Barth, M. Goldberg, Markus Seidel, A. De Roeck, R. Gerhards, S. K. Kotelnikov, J. Ebert, L. Hajduk, H. Henschel, R. C. W. Henderson, Laurent Favart, R. Roosen, L. N. Shtarkov, J. Martyniak, J. Tutas, A. Panitch, C. Dollfus, F. Rouse, L. Jnsson, R. Prosi, J. Hladky, Ch. Ley, J. Riedlberger, Ulrich Goerlach, T. Kurča, S. M. Robertson, A. Usik, H. Bergstein, B. Fominykh, Yves Sirois, Peter Loch, Wolfram Erdmann, D. Schmidt, T. Khler, R. D. Martin, A. Wegner, Didier Lacour, A. Wagener, Eckhart Fretwurst, S. D. Kolya, Th. Naumann, Peter Schacht, U. Stsslein, G. Pope, H. Duhm, J. Lipinski, G. Franke, G. Villet, J. E. Olsson, H. K. Nguyen, I. V. Gorelov, Gregorio Bernardi, V. Boudry, T. Ahmed, Pierre Marage, Anton Babaev, C. Thiebaux, Ch. Coutures, W. Struczinski, W. Bartel, J. Strachota, R. Grssler, H. Hufnagel, J. M. Foster, E. Deffur, M. Savitsky, K. Zuber, P. Goritchev, P. Kostka, a A. Akhundov, V L. Hudgson, A. Courau, S. Kermiche, E. Panaro, J. Cvach, D. Dllmann, C.D. Hilton, J.G. Contreras, R. Bernet, K. Gamerdinger, J. Duboc, D. Neyret, W. Braunschweig, M. David, R. Eichler, H. E. Roloff, R. Sell, J. P. Kubenka, S. Kazarian, M. Flieser, U. Siewert, E. Rizvi, G. W. Noyes, J. Stier, Y. Vazdik, M. Zimmer, Jean-Francois Laporte, P. Murn, H. Kster, G. Lindstrm, H. Lohmander, S. Dagoret, A. Valkrov, D. Feeken, J. Ferencei, V I. Shekelyan, W. Hildesheim, K. Wacker, R. Steinberg, Frank Raupach, Dusan Bruncko, I. R. Kenyon, H. Spitzer, F. Ferrarotto, H. Genzel, N. Wulff, J. Spiekermann, P. Kasselmann, P. Van Esch, E. Elsen, J. Marks, G. Rdel, A. Rostovtsev, Claus Kleinwort, S. Willard, U P. Krger, Martin Erdmann, U. Obrock, F. Niebergall, V. Korbel, Vladimir Andreev, L. Grlich, M. Winde, P. Uelkes, L. Johnson, G. Bertrand-Coremans, L. Criegee, S. Reinshagen, C. Kiesling, S. Rusakov, M. Gebauer, V. Nagovitsin, M. Arpagaus, K. Gabathuler, K. Rybicki, A. Buniatian, D. Wegener, W.J. Haynes, J. Zcek, L. R. West, M. W. Krasny, H. Krehbiel, G. Buschhorn, V. Efremenko, A. Walther, W. Zimmermann, S. Mikocki, J. Baehr, A. Schning, J. Gayler, D. Lke, R. Marshall, Dave Sankey, G. D. Patel, H. Meyer, D.P. Johnson, J. V. Morris, G. Schmidt, M. Forbush, A. Schwind, R. Maraček, J-P. Meyer, W. von Schlippe, A. Lebedev, T. Merz, M. Ibbotson, M. Rietz, D. Haidt, G. Heinzelmann, M. Fleischer, M. Oakden, H. Shooshtari, R. Nisius, J. R. Smith, L. Buengener, I. Shevyakov, J. Martens, Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Annihilation, Proton, 010308 nuclear & particles physics, Perturbative QCD, Parton, HERA, Jet (particle physics), Deep inelastic scattering, 01 natural sciences, Nuclear physics, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, 010306 general physics
Abstract

Jet rates in deep inelastic electron proton scattering are studied with the H1 detector at HERA for momentum transfers squared between 10 and 4000 GeV 2 . It is shown that they can be quantitatively described by perturbative QCD in next to leading order making use of the parton densities of the proton and with the strong coupling constant α s as a free parameter. The measured value, α s ( M Z 2 ) = 0.123 ± 0.018, is in agreement both with determinations from e + e − annihilation at LEP using the same observable and with the world average.

Published
1995

2. A measurement of the proton structure function <tex>F_{2}$</tex> (x, <tex>Q^{**}2)$</tex>

Author

H. U. Martyn, Matthias Klein, C. Niebuhr, Wolfram Erdmann, L. Criegee, T. Ahmed, M. Hppner, V. Andreev, D. Goldner, L. Grlich, R. Bernet, L. Jnsson, M. Colombo, H. E. Roloff, L. Del Buono, F W. Bsser, I. W. Walker, Murrough Landon, A. E. Wright, M. Kuhlen, K. Rybicki, G. Grindhammer, Yves Sirois, Paul Richard Newman, Grzegorz Nowak, G. Mller, C. Jacobsson, Christoph Grab, U. Seehausen, J. Kurzhfer, F. Botterweck, E. Snchez, P. Trul, H. Lohmander, G. Bertrand-Coremans, R. Kaschowitz, G. Franke, A. Wegner, a A. Akhundov, E. Panaro, W. Hildesheim, R. Eichler, J. P. Kubenka, G. W. Noyes, A. Walther, H. Itterbeck, P. Van Mechelen, J. V. Morris, S. Prell, H. Erlichmann, P. E. Reimer, W. Zimmermann, S. Riess, C. Cormack, E. M. Hanlon, O. Hamon, Armen Vartapetian, J. Baehr, V. Lubimov, T. Jansen, P. Verrecchia, Roland Horisberger, M. Nyberg-Werther, G. Heinzelmann, G. G. Winter, S. Willard, K. Daum, M. Forbush, A. Rostovtsev, R. J. Ellison, H. H. Kaufmann, Jan Hladky, I. Shevyakov, P. Steffen, P. Goritchev, T. R. Ebert, A. Droutskoi, C. Schmidt, H. Rick, N. Magnussen, J. P. Sutton, P. Di Nezza, M. Winde, P. Uelkes, L. Johnson, Ch. Ley, A. Schwind, N. Sahlmann, E. Mroczko, M. Gebauer, A. Fedotov, G. Knies, Eckhard Elsen, V. Nagovitsin, K. Gamerdinger, U. Kathage, E. Schuhmann, V. Chernyshov, M. Steenbock, H. Hufnagel, P. Hill, P. Robmann, J. Bán, H. Grssler, J. Khne, J. Duboc, D. Neyret, S. Schiek, M. Hampel, B. Kuznik, Ph. Huet, S. Kermiche, S. Aid, J. Buerger, C. Kiesling, Wolfgang Lange, A. Lindner, J. Janoth, D. Dllmann, C.D. Hilton, E. Malinovskii, J.G. Contreras, B. Stella, J. Gayler, S. Eichenberger, I. R. Kenyon, T. Krmerkmper, L. N. Shtarkov, Dave Sankey, J. Haack, V. Brisson, A. De Roeck, A. J. Campbell, Richard E. Taylor, Mikhail Danilov, K. Gabathuler, A. Buniatian, D. Wegener, D. Krcker, W.J. Haynes, J. Formnek, A. Wagener, R. Roosen, I. O. Skillicorn, D. Zarbock, H. B. Dreis, Ch. Pichler, H. P. Wellisch, Max Weber, M. A. Jabiol, T. P. Yiou, Martin Erdmann, F. Charles, J. Katzy, T. Khler, U. Obrock, S. Reinshagen, A. Panitch, C. Keuker, J. Martyniak, Carl R. Brune, M. Barth, R. Marshall, M. F. Hess, T. Carli, B. Fominykh, L. R. West, U. Bassler, M. W. Krasny, T. Kurča, M. Htte, P. Kostka, B. Naroska, G. D. Patel, A. Usik, R. Nahnhauer, Zhiqing Zhang, Benno List, H. Krehbiel, J. Turnau, K. Mller, Barbara Clerbaux, H. K. Nguyen, I. V. Gorelov, J. Zcek, H. Bergstein, Eckhart Fretwurst, M. Arpagaus, G. Siegmon, K. C. Hoeger, T.C. Nicholls, B. Schwab, David Schmidt, S. Levonian, A. Gellrich, J. E. Olsson, W. Bartel, G. Buschhorn, V. Efremenko, F. Lamarche, R. Grssler, P. Ribarics, H. Duhm, B. Andrieu, M. Wagener, V. Riech, R. Felst, R. Beyer, K. Flamm, E. Barrelet, David Cussans, S. Mani, E. A. De Wolf, Ch. Berger, F. Moreau, J. D. Dowell, Ch. Coutures, W. Struczinski, J. M. Foster, D. Feeken, W. Braunschweig, M. Savitsky, R. Sell, S. Kazarian, Hermann Kolanoski, D. Clarke, M. Ibbotson, A. Mavroidis, E. Gabathuler, C. Pascaud, M. Hapke, John A Coughlan, A. Lebedev, S. Egli, Horst Oberlack, G. Weber, U. Siewert, E. Deffur, P. Baranov, S. Mikocki, A. Jacholkowska, Peter Schleper, H. P. Beck, Stephen Burke, M. Zimmer, J. Feltesse, Vincent Boudry, Jean-Francois Laporte, P. I. P. Kalmus, M. Rietz, S. Valkr, D. Haidt, Laurent Favart, C. Dollfus, C. A. Meyer, Karlheinz Meier, K. Zuber, Marc Besancon, J. Riedlberger, U. Krner-Marquis, J. Cvach, A.S. Belousov, Sergey Rusakov, B. Gonzalez-Pineiro, G. Schmidt, A. Braemer, V. Blobel, S. M. Robertson, U. Stsslein, S. D. Kolya, Jean-Arcady Meyer, Eram Rizvi, A. Gruber, F. Rouse, M. David, Ulrich Goerlach, M. Vecko, R. Gerhards, Daniel Pitzl, C. Kleinwort, R. L. Lander, Frank Raupach, K. H. Hiller, Daniel Johnson, D. Mercer, I. Herynek, R. C. W. Henderson, E. Prez, N. Wulff, J. Tutas, S. Masson, R. Buchholz, M. Flieser, F. Niebergall, David Milstead, J. Stier, Y. Vazdik, P. Kasselmann, V.L. Hudgson, Stephen Maxfield, P. A. Smirnov, J. Stiewe, R. Prosi, A. Schning, J. Martens, U P. Krger, F. Kole, S. K. Kotelnikov, L. Hajduk, A. B. Clegg, R. Rylko, Andrew Mehta, N. Gogitidze, M. Fleischer, K. Johannsen, H. Kster, D. Lke, P. Murn, K. Rter, Peter Schacht, S. Tapprogge, W.D. Dau, J. B. Dainton, J. Lipinski, K. Stephens, E. Peppel, A. Valkrov, J. Spiekermann, Gregorio Bernardi, J. Ebert, R. Starosta, Anton Babaev, C. Thiebaux, J. Strachota, F. Sefkow, Peter Loch, R. D. Martin, Didier Lacour, G. Pope, J. Garvey, A. M. Fomenko, G. Villet, Pierre Marage, M. J. Burton, H. Spitzer, A. Courau, O. Dnger, Christophe Royon, Winston Ko, Guenter Eckerlin, Steve McMahon, V. Schrder, F. Linsel, G C. Lpez, J. Heatherington, G. Flgge, R. D. Appuhn, C. Gruber, G. Lindstrm, D. Kant, G. Rdel, Kerstin Borras, D. Newton, A. Semenov, Yu. Solovev, F. Brasse, P. Lanius, Markus Seidel, M. Korn, R. Nisius, U. Straumann, Thomas Naumann, V. Korbel, J. R. Smith, L. Buengener, E. Eisenhandler, R. Maraček, Fabian Zomer, G. Cozzika, F. Eisele, W. von Schlippe, Hannes Jung, Alexander Zhokin, T. Merz, C. Vallée, E. Evrard, S. Dagoret, J. Ferencei, V I. Shekelyan, K. Wacker, R. Steinberg, Dusan Bruncko, F. Ferrarotto, H. Genzel, T. Greenshaw, J.P. Phillips, P. Van Esch, J. Marks, B. Delcourt, C. Leverenz, K. Rosenbauer, M. Jaffré, G. Thompson, M. Oakden, H. Meyer, E. Wnsch, H. Henschel, H. J. Behrend, J.C. Bizot, M. Goldberg, H. Shooshtari, Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Diffraction, Nuclear and High Energy Physics, Range (particle radiation), Logarithm, Proton, 010308 nuclear & particles physics, Momentum transfer, Hadron, FOS: Physical sciences, HERA, 01 natural sciences, Measure (mathematics), High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Atomic physics, 010306 general physics
Abstract

A measurement of the proton structure function $F_{\!2}(x,Q^2)$ is reported for momentum transfer squared $Q^2$ between 4.5 $GeV^2$ and 1600 $GeV^2$ and for Bjorken $x$ between $1.8\cdot10^{-4}$ and 0.13 using data collected by the HERA experiment H1 in 1993. It is observed that $F_{\!2}$ increases significantly with decreasing $x$, confirming our previous measurement made with one tenth of the data available in this analysis. The $Q^2$ dependence is approximately logarithmic over the full kinematic range covered. The subsample of deep inelastic events with a large pseudo-rapidity gap in the hadronic energy flow close to the proton remnant is used to measure the "diffractive" contribution to $F_{\!2}$., 32 pages, ps, appended as compressed, uuencoded file

Published
1995

3. Experimental study of hard photon radiation processes at Hera

Author

C. Cormack, Alan Campbell, E. M. Hanlon, U. Stsslein, G. G. Winter, Wolfgang Lange, G. Grindhammer, P. Steffen, V. Lubimov, G. Siegmon, Frank Raupach, K. Rosenbauer, S. M. Robertson, R. Beyer, F. Moreau, J. D. Dowell, E. Malinovskii, D. Zarbock, D. Schmidt, K. Rter, Daniel Pitzl, N. Wulff, P. Kasselmann, M. Jaffré, G. Thompson, J. Buerger, Peter Schacht, B. Stella, H. P. Wellisch, Max Weber, L. N. Shtarkov, A. Jacholkowska, N. Magnussen, S. K. Kotelnikov, T. Krmerkmper, J. Gayler, K. Gabathuler, A. Buniatian, D. Wegener, W.J. Haynes, L. Hajduk, S. Aid, U P. Krger, N. Sahlmann, G. Villet, Gregorio Bernardi, V. Boudry, Pierre Marage, J. Feltesse, A. Courau, A. Panitch, M. W. Krasny, Peter Loch, Armen Vartapetian, Axel Lindner, R. Marshall, E. Schuhmann, Anton Babaev, Didier Lacour, G. Pope, Martin Erdmann, J. V. Morris, G. Schmidt, F. R. Rouse, V. Efremenko, A. Droutskoi, U. Obrock, J. G. Contreras, C. Thiebaux, J. Strachota, K. Gamerdinger, H. Krehbiel, E. Wnsch, H. J. Behrend, J.C. Bizot, M. Goldberg, R. Nisius, R. Grssler, G. Buschhorn, F. Niebergall, V. Korbel, M. Forbush, M. Htte, A. Schwind, M. A. Jabiol, E. Evrard, Max Klein, S. Mikocki, H. E. Roloff, K. Johannsen, K. C. Hoeger, S. Eichenberger, Carl R. Brune, M. Barth, Zhen Zhang, Vladimir Andreev, J. M. Foster, Christophe Royon, C. Niebuhr, A A. Akhundov, B. Schwab, V. Brisson, T. Jansen, H. Rick, R. Kaschowitz, Roland Horisberger, S. Riess, Steve McMahon, Dave Sankey, S. Egli, S. Valkr, T. P. Yiou, U. Bassler, R. Buchholz, D. Mercer, J. R. Smith, D. Goldner, L. Buengener, F. Linsel, P. A. Smirnov, K. Meier, G. Bertrand-Coremans, Tim Greenshaw, S. Levonian, A. Wegner, B. Naroska, V. L. Hudgson, G. D. Patel, Winston Ko, B. Delcourt, M. Kuhlen, V. Riech, A. Usik, H. Meyer, H. Grssler, M. Hampel, B. Kuznik, Stefan Tapprogge, E. Panaro, M. Savitsky, D.P. Johnson, Hans Peter Beck, H. Lohmander, A. Walther, J. Heatherington, S. Masson, K. Zuber, T. Kurca, M. Wagener, C. Pascaud, L. Criegee, D. Newton, P. Hill, I. W. Walker, V. Chernyshov, J. E. Olsson, W. Bartel, G. Mller, Christoph Grab, Laurent Favart, R. Eichler, C. Leverenz, C. Dollfus, Guenter Eckerlin, S. Rusakov, L. Grlich, M. Hapke, J. P. Kubenka, R. Nahnhauer, M. Hess, Ulrich Goerlach, Ph. Huet, Ch. Pichler, W. Zimmermann, P. Ribarics, J. Baehr, R. Felst, J. Bán, T. Ahmed, E. Barrelet, E. Mroczko, M. Gebauer, D. Kant, K. Flamm, David Cussans, A. Mavroidis, K. Stephens, E. Peppel, V. Nagovitsin, O. Dnger, G. Rdel, Kerstin Borras, R. M. Martin, W. Braunschweig, G. W. Noyes, P. Lanius, T. C. Nicholls, A. Gellrich, R. Sell, S. Kazarian, F. Lamarche, K. H. Hiller, R. C. W. Henderson, M. Hppner, A. Lebedev, J. Cvach, M. Oakden, L. Jnsson, M. Rietz, U. Siewert, P. Verrecchia, E. Snchez, P. I. P. Kalmus, G C. Lpez, E. A. De Wolf, Ch. Berger, M. Zimmer, G. Cozzika, F. Eisele, J. Janoth, E. Eisenhandler, R. Gerhards, R. J. Ellison, Jean-Francois Laporte, D. Haidt, G. Lindstrm, J. Tutas, Eram Rizvi, I. R. Kenyon, G. Heinzelmann, A. Semenov, Hermann Kolanoski, D. Clarke, John A Coughlan, H. H. Kaufmann, K. Mller, J.P. Phillips, C. A. Meyer, H. U. Martyn, A. Braemer, S. Dagoret, Volker Blobel, Paul Newman, C. Keuker, Judith Katzy, A. Valkrov, J. Spiekermann, H. Spitzer, M. Fleischer, R. Prosi, V. Schrder, A. Gruber, Roland Bernet, J. Formnek, Horst Oberlack, I. Herynek, A. Schning, R. Maraček, J-P. Meyer, B. Gonzalez-Pineiro, Hannes Jung, Alexander Zhokin, V I. Shekelyan, K. Wacker, R. Steinberg, W. von Schlippe, R. Starosta, T. Merz, M. Ibbotson, P. Baranov, S. Mani, Tancredi Carli, Stephen Burke, Yu. Solovev, F. Brasse, F W. Bsser, H. Shooshtari, Grzegorz Nowak, J. Martens, E. Prez, F. Kole, U. Seehausen, M. Korn, J. Riedlberger, Dusan Bruncko, F. Ferrarotto, G. Flgge, R. L. Lander, U. Krner-Marquis, H. Genzel, C. Jacobsson, Michael Seidel, J. Khne, F. Sefkow, Benno List, F. Charles, Barbara Clerbaux, Ch. Ley, Peter Schleper, H. Kster, D. Lke, J. Ferencei, P. Van Esch, J. Garvey, A. M. Fomenko, P. Murn, R. Taylor, J. Turnau, P. Trul, E. Elsen, J. Marks, A. Rostovtsev, J. P. Sutton, Claus Kleinwort, W.D. Dau, F. Zomer, J. B. Dainton, G. Weber, M. Steenbock, U. Straumann, B. Andrieu, M. J. Burton, A. Wagener, U. Kathage, E. Gabathuler, Marc Besancon, C. Vallée, H. K. Nguyen, A.S. Belousov, I. V. Gorelov, J. Zcek, Ch. Coutures, W. Struczinski, Stephen Maxfield, J. Stiewe, J. Kurzhfer, A. B. Clegg, R. Rylko, Andrew Mehta, N. Gogitidze, R. D. Appuhn, Yves Sirois, M. Vecko, J. Lipinski, J. Ebert, G. Franke, H. Hufnagel, C. Gruber, S. Kermiche, P. Goritchev, D. Dllmann, C.D. Hilton, Mikhail Danilov, R. Roosen, J. Duboc, D. Neyret, T. Khler, J. Martyniak, B. Fominykh, Eckhart Fretwurst, S. Reinshagen, C. Kiesling, M. Arpagaus, K. Rybicki, Wolfram Erdmann, D. Feeken, W. Hildesheim, M. Colombo, S. Willard, Murrough Landon, A. E. Wright, M. Winde, P. Uelkes, L. Johnson, H. Itterbeck, P. Van Mechelen, H. Erlichmann, O. Hamon, K. Daum, G. Knies, S. Schiek, J. Haack, I. O. Skillicorn, H. B. Dreis, M. Nyberg-Werther, T. R. Ebert, A. Fedotov, A. De Roeck, H. Henschel, H. Bergstein, S. D. Kolya, Th. Naumann, H. Duhm, E. Deffur, P. Kostka, M. David, M. Flieser, J. Stier, Y. Vazdik, L.R. West, David Milstead, S. Prell, Jan Hladky, I. Shevyakov, C. Schmidt, P. Di Nezza, Peter Robmann, L. Del Buono, F. Botterweck, D. Krcker, P. E. Reimer, Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Particle physics, Photon, Luminosity (scattering theory), Physics and Astronomy (miscellaneous), Proton, 010308 nuclear & particles physics, Compton scattering, Bremsstrahlung, Elementary particle, HERA, 01 natural sciences, 7. Clean energy, law.invention, Nuclear physics, law, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, 010306 general physics, Collider, Engineering (miscellaneous)
Abstract

We present an experimental study of theep→eγ+p andep→eγ+X processes using data recorded by the H1 detector in 1993 at the electron-proton collider HERA. These processes are employed to measure the luminosity with an accuracy of 4.5 %. A subsample of theep→eγ+X events in which the hard photon is detected at angles θγ′ ≤ 0.45 mrad with respect to the incident electron direction is used to verify experimentally the size of radiative corrections to theep→eX inclusive cross section and to investigate the structure of the proton in theQ2 domain down to 2 GeV2, lower than previously attained at HERA.

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