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42 results on '"electron p: inclusive reaction"'

1. Photoproduction of the J/psi meson at HERA at next-to-leading order within the frmework of nonrelativistic QCD

Author: Butenschoen, Mathias
Subjects: Born approximation, quantum chromodynamics: nonrelativistic, octet [color], color: octet, electron p: inclusive reaction, thesis, correlation: higher-order, nonrelativistic [quantum chromodynamics], transverse momentum: dependence, singlet [color], energy dependence, photoproduction [J/psi(3100)], factorization, J/psi(3100): photoproduction, differential cross section, H1, dependence [transverse momentum], color: singlet, inclusive reaction [electron p], higher-order [correlation]
Abstract: Universität Hamburg, Diss., 2009; 102 pp. (2009). = Universität Hamburg, Diss., 2009
Published: 2009

2. Investigation of heavy quark and multiple interactions at HERA

Author: Marti Magro, Lluis
Subjects: photoproduction [quark], D*(2010): photoproduction, showers [parton], spectrum [multiplicity], electron p: inclusive reaction, jet: associated production, photoproduction [D*(2010)], transverse momentum [differential cross section], parton: showers, rapidity dependence, quark: particle identification, heavy quark, associated production [jet], photon: resolved, colliding beams [electron p], thesis, resolved [photon], Monte Carlo [numerical calculations], quark: photoproduction, particle identification [quark], multiple scattering, DESY HERA Stor, electron p: colliding beams, differential cross section: transverse momentum, H1, multiplicity: spectrum, inclusive reaction [electron p], numerical calculations: Monte Carlo
Abstract: Universität Hamburg, Diplomarbeit, 2005; 101 pp., (2005). doi:10.3204/DESY-THESIS-2005-030, Published by Deutsches Elektronen-Synchrotron, DESY, Hamburg
Published: 2005
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3. Heavy Quarkonium Physics

Author: Brambilla, N., Kramer, M., Mussa, R., Vairo, A., Bali, G., Bodwin, Geoffrey T, Braaten, E., Eichten, E., Eidelman, S., Godfrey, S., Hoang, A., Jamin, M., Kharzeev, D., Lombardo, M. P, Lourenco, C., Meyer, A. B, Papadimitriou, V., Patrignani, C., Rosati, M., Sanchis-Lozano, M. A, Satz, Helmut, Soto, J., Besson, D. Z, Bettoni, D., Bohrer, A., Boogert, S., Chang, C. -H, Cooper, P., Crochet, P., Datta, S., Davies, C., Deandrea, A., Faustov, R., Ferguson, T., Galik, R., Harris, F., Iouchtchenko, O., Kaczmarek, Olaf, Karsch, Frithjof, Kienzle, M., Kiselev, V. V, Klein, S. R, Kroll, P., Kronfeld, Andreas S, Kuang, Y. -P, Laporta, V., Lee, Jungil, Leibovich, A., Ma, J. P, Mackenzie, Paul B, Maiani, L., Mangano, M. L, Meyer, A., Mo, X. H, Morningstar, C., Nairz, A., Napolitano, J., Olsen, S., Penin, A., Petreczky, P., Piccinini, F., Pineda, A., Polosa, A. D, Ramello, L., Rapp, R., Richard, J. -M, Riquer, V., Ricciardi, S., Robutti, E., Schneider, O., Scomparin, E., Simone, J., Skwarnicki, T., Stancari, G., Stewart, Iain W, Sumino, Yu, Teubner, T., Tseng, J., Vogt, R., Wang, P., Yabsley, Bruce D, Yuan, C. Z, Zantow, F., Zhao, Z. G, Zieminski, A., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), CERN, Suisse, Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Brambilla, N., Krämer, M., Mussa, R., Vairo, A., Bali, G., Bodwin, G. T., Braaten, E., Eichten, E., Eidelman, S., Godfrey, S., Hoang, A., Jamin, M., Kharzeev, D., Lombardo, M. P., Lourenco, C., Meyer, A. B., Papadimitriou, V., Patrignani, C., Rosati, M., Sanchis-Lozano, M. A., Satz, H., Soto, J., Besson, D. Z., Bettoni, D., Böhrer, A., Boogert, S., Chang, C. -H., Cooper, P., Crochet, P., Datta, S., Davies, C., Deandrea, A., Faustov, R., Ferguson, T., Galik, R., Harris, F. A., Iouchtchenko, O., Kaczmarek, O., Karsch, F., Kienzle, M., Kiselev, V. V., Klein, S. R., Kroll, P., Kronfeld, A., Kuang, Y. -P., Laporta, V., Jungil, Lee, Leibovich, A., Ma, J. P., Mackenzie, P., Maiani, L., Mangano, M. L., Meyer, A., Mo, X. H., Morningstar, C., Nairz, A., Napolitano, J., Olsen, S., Penin, A., Petreczky, P., Piccinini, F., Pineda, A., Polosa, A. D., Ramello, L., Rapp, R., Richard, J. -M., Riquer, V., Ricciardi, S., Robutti, E., Schneider, O., Scomparin, E., Simone, J., Skwarnicki, T., Stancari, G., Stewart, I. W., Sumino, Yu., Teubner, T., Tseng, J., Vogt, R., Wang, P., Yabsley, B., Yuan, C. Z., Zantow, F., Zhao, Z. G., and Zieminski, A.
Subjects: experimental methods, Nuclear Theory, review, electron p: inclusive reaction, FOS: Physical sciences, electron positron: annihilation, quarkonium: electroproduction, anti-p p: annihilation, High Energy Physics - Experiment, Nuclear Theory (nucl-th), numerical calculations: interpretation of experiments, High Energy Physics - Experiment (hep-ex), quarkonium: heavy, High Energy Physics - Lattice, High Energy Physics - Phenomenology (hep-ph), Experiment-HEP, counters and detectors, new interaction, quantum chromodynamics: perturbation theory, Nuclear Experiment (nucl-ex), hadron hadron: interaction, Nuclear Experiment, Particle Physics - Phenomenology, quantum chromodynamics: nonrelativistic, quarkonium: decay modes, High Energy Physics - Lattice (hep-lat), lattice field theory, bibliography, matter: effect, quarkonium: hadron spectroscopy, High Energy Physics - Phenomenology, scattering: heavy ion, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Phenomenology-HEP, quarkonium: hadroproduction
Abstract: This report is the result of the collaboration and research effort of the Quarkonium Working Group over the last three years. It provides a comprehensive overview of the state of the art in heavy-quarkonium theory and experiment, covering quarkonium spectroscopy, decay, and production, the determination of QCD parameters from quarkonium observables, quarkonia in media, and the effects on quarkonia of physics beyond the Standard Model. An introduction to common theoretical and experimental tools is included. Future opportunities for research in quarkonium physics are also discussed., Comment: xviii + 487 pages, 260 figures. The full text is also available at the Quarkonium Working Group web page: http://www.qwg.to.infn.it
Published: 2005

4. Photoproduction of $D^$ Mesons and $D^$ Mesons Associated with Jets at HERA

Author: Flucke, Gero
Subjects: perturbation theory [quantum chromodynamics], D*(2010): photoproduction, electron p: inclusive reaction, jet: associated production, photoproduction [D*(2010)], transverse momentum [differential cross section], D*(2010): hadronic decay, energy dependence, angular distribution, +D*%282010%29+jet+electron+anything%22">electron p --> D*(2010) jet electron anything, associated production [jet], parton [showers], 319 GeV-cms, Dissertation, hadronic decay [D*(2010)], ratio [channel cross section], quantum chromodynamics: perturbation theory, differential cross section: factorization, correction: higher-order, colliding beams [electron p], higher-order [correction], factorization [differential cross section], +D*%282010%29+electron+anything%22">electron p --> D*(2010) electron anything, thesis, +D0+pi%22">D*(2010) --> D0 pi, DESY HERA Stor, electron p: colliding beams, rapidity spectrum, +K+pi%22">D0 --> K pi, differential cross section: transverse momentum, H1, showers: parton, inclusive reaction [electron p], channel cross section: ratio, experimental results
Abstract: Universität Hamburg, Diss., 2005; 106 pp., (2005). doi:10.3204/DESY-THESIS-2005-006, Published by Deutsches Elektronen-Synchrotron, DESY, Hamburg
Published: 2005
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5. Measurement of beauty production from dimuon events at HERA / ZEUS

Author: Bloch, Ingo
Subjects: +2muon+anything%22">electron p --> 2muon anything, bottom: semileptonic decay, rapidity dependence [differential cross section], differential cross section: rapidity dependence, electron p: inclusive reaction, bottom: pair production, mass spectrum: dimuon, +2beauty+anything%22">electron p --> 2beauty anything, transverse momentum [muon], pair production [muon], 300: 318 GeV-cms, +charm+muon%22">beauty --> charm muon, colliding beams [electron p], cross section, background, angular correlation, dimuon [charge correlation], thesis, +muon+anything%22">charm --> muon anything, 318 GeV-cms [300], charge correlation: dimuon, bibliography, transverse momentum: dependence, ZEUS, dimuon [mass spectrum], Monte Carlo [numerical calculations], muon: pair production, pair production [bottom], DESY HERA Stor, electron p: colliding beams, semileptonic decay [bottom], dependence [transverse momentum], muon: transverse momentum, numerical calculations: Monte Carlo, inclusive reaction [electron p], experimental results
Abstract: Universität Hamburg, Diss., 2005; 187 pp., (2005). doi:10.3204/DESY-THESIS-2005-034, Published by Deutsches Elektronen-Synchrotron, DESY, Hamburg
Published: 2005

6. Measurement of beauty quark cross sections in photoproduction with the ZEUS experiment at the electron-proton collider HERA

Author: Gutsche, Oliver
Subjects: perturbation theory [quantum chromodynamics], bottom: semileptonic decay, pair production [jet], electron p: inclusive reaction, photoproduction [bottom], track data analysis: transverse momentum, efficiency [data analysis method], (2jet muon) [final state], track data analysis: impact parameter, +2jet+muon+electron+anything%22">electron p --> 2jet muon electron anything, bottom: photoproduction, data analysis method: efficiency, transverse momentum [track data analysis], parton [showers], quantum chromodynamics: perturbation theory, colliding beams [electron p], +2bottom+electron+anything%22">electron p --> 2bottom electron anything, angular correlation, bottom [particle identification], thesis, bibliography, particle identification: bottom, ZEUS, Monte Carlo [numerical calculations], DESY HERA Stor, electron p: colliding beams, semileptonic decay [bottom], differential cross section, jet: pair production, final state: (2jet muon), impact parameter [track data analysis], showers: parton, numerical calculations: Monte Carlo, inclusive reaction [electron p]
Abstract: Universität Hamburg, Diss., 2005; 194 pp., (2005). doi:10.3204/DESY-THESIS-2005-010, Published by Deutsches Elektronen-Synchrotron, DESY, Hamburg
Published: 2005

7. Exclusive channels in semi-inclusive production of pions and kaons

Author: Diehl, M., Kugler, W., Schafer, A., and Weiss, C.
Subjects: electron p: deep inelastic scattering, generalized parton distribution, electron p: inclusive reaction, cross section: longitudinal, quark: momentum spectrum, K: inclusive reaction, pi: electroproduction, numerical calculations: interpretation of experiments, pseudoscalar meson: photoproduction, vector meson: photoproduction, quantum chromodynamics: factorization, photon p: exclusive reaction, quark: fragmentation
Abstract: Physical review / D 72(5), 059902 (2005). doi:10.1103/PhysRevD.72.059902, We investigate the role of exclusive channels in semi-inclusive electroproduction of pions and kaons. Using the QCD factorization theorem for hard exclusive processes we evaluate the cross sections for exclusive pseudoscalar and vector meson production in terms of generalized parton distributions and meson distribution amplitudes. We investigate the uncertainties arising from the modeling of the nonperturbative input quantities. Combining these results with available experimental data, we compare the cross sections for exclusive channels to that obtained from quark fragmentation in semi-inclusive deep inelastic scattering. We find that rho^0 production is the only exclusive channel with significant contributions to semi-inclusive pion production at large z and moderate Q^2. The corresponding contribution to kaon production from the decay of exclusively produced phi and K^* is rather small., Published by Inst., Woodbury, NY
Published: 2005
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8. Next-to-leading-order predictions for $\mathrm{D^{*^\pm}}$ plus jet photoproduction at DESY HERA

Author: Heinrich, Gudrun and Kniehl, Bernd A.
Subjects: D*(2010): photoproduction, interpretation of experiments: DESY HERA Stor, electron p: inclusive reaction, jet: associated production, perturbation theory: higher-order, D*(2010): electroproduction, quark: charm, rapidity spectrum, rapidity spectrum: jet, rapidity spectrum: D*(2010), transverse momentum: spectrum, factorization, quantum chromodynamics, fragmentation function: nonperturbative, transverse momentum: jet, angular distribution, photon: resolved, photon p: inclusive reaction, numerical calculations
Abstract: Physical review / D 70(9), 094035 (2004). doi:10.1103/PhysRevD.70.094035, We study the photoproduction of a D^{*+-} meson in association with a hadron jet at next-to-leading order in the parton model of QCD with non-perturbative fragmentation functions extracted from LEP1 data of e^+e^- annihilation. The transverse-momentum and rapidity distributions recently measured at DESY HERA in various kinematic ranges nicely agree with our theoretical predictions. This provides a useful test of the universality and the scaling violations of the fragmentation functions predicted by the factorization theorem. These comparisons also illustrate the significance of the charm component in the resolved photon. This is elaborated by investigating the cross-section distributions in x_obs^gamma and cos(theta^*)., Published by Inst., Woodbury, NY
Published: 2004
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9. A feasibility study of open charm detection at HERMES

Author: Ehrenfried, Markus
Subjects: internal [polarized target], polarized beam [electron], electron: polarized beam, particle identification: efficiency, electron p: inclusive reaction, HERMES, D*(2010): hadronic decay, D0: hadronic decay, quark: charm, 27.5 GeV, charm [quark], particle identification: charm, hadronic decay [D*(2010)], charm [particle identification], hadronic decay [D0], efficiency [particle identification], background, +D0+pi%2B%22">D*(2010) --> D0 pi+, thesis, +K-+pi%2B%22">D0 --> K- pi+, Monte Carlo [numerical calculations], quark: pair production, DESY HERA Stor, pair production [quark], polarized target: internal, inclusive reaction [electron p], numerical calculations: Monte Carlo, experimental results
Abstract: Westfälische Wilhelms-Universität Münster , Diss., 2001; 64 pp. (2001). = Westfälische Wilhelms-Universität Münster, Diss., 2001
Published: 2001
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10. Measurement of D*+- cross-sections in photon proton collisions at HERA

Author: Stonjek, S.
Subjects: perturbation theory [quantum chromodynamics], channel cross section, D*(2010): photoproduction, +D*%282010%29+electron+anything%22">electron p --> D*(2010) electron anything, approx. 300 GeV-cms, ZEUS [magnetic detector], thesis, electron p: inclusive reaction, photoproduction [D*(2010)], bibliography, +K+2pi%22">D*(2010) --> K 2pi, transverse momentum [differential cross section], D*(2010): hadronic decay, rapidity dependence, DESY HERA Stor, electron p: colliding beams, differential cross section: transverse momentum, magnetic detector: ZEUS, hadronic decay [D*(2010)], quantum chromodynamics: perturbation theory, inclusive reaction [electron p], colliding beams [electron p], experimental results
Abstract: Universität Hamburg, Diss., 2001; 91 pp. (2001). = Universität Hamburg, Diss., 2001
Published: 2001
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11. Heavy quark production in the semihard QCD approach at THERA

Author: Baranov, S. P. and Zotov, N. P.
Subjects: electron p: deep inelastic scattering, D*(2010): photoproduction, Lipatov equation, pair production [jet], electron p: inclusive reaction, jet: associated production, gluon: momentum spectrum, photoproduction [D*(2010)], D*(2010): electroproduction, spin: alignment, Monte Carlo [numerical calculations], electroproduction [D*(2010)], photoproduction [J/psi(3100)], momentum spectrum [gluon], inclusive reaction [photon p], alignment [spin], J/psi(3100): photoproduction, quantum chromodynamics, differential cross section, deep inelastic scattering [electron p], jet: pair production, associated production [jet], inclusive reaction [electron p], photon p: inclusive reaction, numerical calculations: Monte Carlo
Abstract: 9 pp. (2001)., In the framework of the semihard ($k_T$ factorization) QCD approach, we consider the photoproduction of D* mesons associated with two hadron jets and the D* production in DIS at THERA conditions with the emphasis on the BFKL and CCFM dynamics of gluon distributions. In the photoproduction of D* mesons the attention is focused on the variable $x_\gamma$, which is the fraction of the photon momentum contributed to a pair of jets with largest $p_T$. We show that our theoretical results are sensitive to the BFKL type dynamics which may be investigated at THERA energies. We also discuss possible effect of $\J/\psi$ meson spin alignement, which is thought to be a vivid manifestation of gluon off-shellness.
Published: 2001
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12. Charm quark and $D^{*\pm}$ cross-sections in deeply inelastic scattering at HERA

Author: Harris, B. W. and Smith, J.
Subjects: electron p: deep inelastic scattering, neutral current, mass: charm, electron p: inclusive reaction, perturbation theory: higher-order, D*(2010): electroproduction, fragmentation function, quantum chromodynamics: correction, renormalization, quark: charm, momentum spectrum: parton, differential cross section: momentum transfer, rapidity spectrum, transverse momentum: spectrum, factorization, structure function, numerical calculations: DESY HERA Stor, quark: electroproduction
Abstract: Physical review / D 57(5), 2806 - 2812 (1998). doi:10.1103/PhysRevD.57.2806, A next-to-leading order Monte Carlo program for the calculation of heavy quark cross sections in deeply inelastic scattering is described. Concentrating on charm quark and D^*(2010) production at HERA, several distributions are presented and their variation with respect to charm quark mass, parton distribution set, and renormalization-factorization scale is studied., Published by Inst., Woodbury, NY
Published: 1998
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13. Jet shapes in $e p$ and $p \bar{p}$ collisions in NLO QCD

Author: Klasen, M. and Kramer, G.
Subjects: jet: direct production, jet: photoproduction, electron p: inclusive reaction, perturbation theory: higher-order, event shape analysis, jet: hadroproduction, model: parton, jet: electroproduction, numerical calculations: interpretation of experiments, rapidity, anti-p p: inclusive reaction, quantum chromodynamics, photon: resolved, transverse energy
Abstract: Physical review / D 56(5), 2702 - 2712 (1997). doi:10.1103/PhysRevD.56.2702, We have calculated jet shapes in low $Q^2$ $ep$ and $p\overline{p}$ collisions in perturbation theory at order $\alpha_s^3$ for the hard parton-parton processes. For the $\gamma p$ process resolved and direct contributions are superimposed. The dependence of the jet shapes on transverse energy, rapidity, and inner cone extension is studied. The numerical results of the calculation are compared with recent data from ZEUS at HERA and from CDF and D0 at the TEVATRON. Good agreement is achieved if the problem of merging overlapping jets is taken into account by varying the parameter $R_{sep}$ as a function of transverse energy and rapidity., Published by Inst., Woodbury, NY
Published: 1997
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14. Charm and charm-strange hadron production in $ep$ collisions at HERA as probes of confinement

Author: Teuscher, Richard John
Subjects: channel cross section, D/s: production, Lambda/c+, yield: (D*(2010) D/s D0), D: production, approx. 300 GeV-cms, thesis, electron p: inclusive reaction, string model: fragmentation, ZEUS, +K-+pi%2B%22">D0 --> K- pi+, Lambda/c: production, +p+K-+pi%2B%22">Lambda/c+ --> p K- pi+, DESY HERA Stor, electron p: colliding beams, charmed particle: electroproduction, charmed meson: hadronic decay, +K-+2pi%2B%22">D+ --> K- 2pi+, +charmed+particle+anything%22">electron p --> charmed particle anything, D0 anti-D0: asymmetry, +Phi%281020%29+pi%22">D/s --> Phi(1020) pi, experimental results
Abstract: University of Toronto, Diss., 1997; 134 pp. (1997). = University of Toronto, Diss., 1997
Published: 1997
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15. Associated $J/\psi$ + $\gamma$ photoproduction as a probe of the color octet mechanism

Author: Cacciari, Matteo, Greco, Mario, and Kramer, Michael, 1
Subjects: channel cross section, quantum chromodynamics: nonrelativistic, charmonium, color: octet, 1800 GeV-cms (anti-p p), Feynman graph, +J%2Fpsi%283100%29+photon+anything%22">photon p --> J/psi(3100) photon anything, electron p: inclusive reaction, +J%2Fpsi%283100%29+photon+anything%22">electron p --> J/psi(3100) photon anything, photon: associated production, mass spectrum, 100 GeV-cms (photon p): 300-GeV-cms (electron p), anti-p p: inclusive reaction, factorization, transverse momentum: spectrum, J/psi(3100): photoproduction, +J%2Fpsi%283100%29+photon+anything%22">anti-p p --> J/psi(3100) photon anything, differential cross section: energy, photon p: inclusive reaction, J/psi(3100): electroproduction, quarkonium: photoproduction, exchange: one-photon
Abstract: Physical review / D 55(11), 7126 - 7133 (1997). doi:10.1103/PhysRevD.55.7126, The associated production of a J/psi and a photon in photon-hadron collisions is considered, and shown to be a good probe of the presence of colour-octet mediated channels in quarkonia production, as predicted by the factorization approach within NRQCD. Total and differential cross sections for photoproduction at fixed target experiments and at HERA are presented. Associated J/psi + gamma production at hadron colliders is briefly discussed., Published by Inst., Woodbury, NY
Published: 1997
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16. Inelastic photoproduction of $J/\psi$ mesons at HERA

Author: Hung, Ling-Wai
Subjects: approx. 300 GeV-cms, thesis, electron p: inclusive reaction, bibliography, ZEUS, mass spectrum: (positron electron), positron p: colliding beams, J/psi(3100): leptonic decay, DESY HERA Stor, electron p: colliding beams, +positron+electron%22">J/psi(3100) --> positron electron, J/psi(3100): photoproduction, color: singlet, +J%2Fpsi%283100%29+positron+anything%22">positron p --> J/psi(3100) positron anything, channel cross section: energy dependence, experimental results
Abstract: McGill Univerity, Diss., 1997; 125 pp. (1997). = McGill Univerity, Diss., 1997
Published: 1997
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17. Color octet contributions to $J/\psi$ photoproduction

Author: Cacciari, Matteo and Kramer, Michael
Subjects: J/psi(3100): energy spectrum, quantum chromodynamics: nonrelativistic, color: octet, Feynman graph, energy spectrum: J/psi(3100), electron p: inclusive reaction, photoproduction: J/psi(3100), electroproduction: J/psi(3100), DESY HERA Stor, numerical calculations: interpretation of experiments, J/psi(3100): photoproduction, channel cross section: energy dependence, photon p: inclusive reaction, J/psi(3100): electroproduction
Abstract: Physical review letters 76(22), 4128 - 4131 (1996). doi:10.1103/PhysRevLett.76.4128, We have calculated the leading color-octet contributions to the production of $J/\psi$ particles in photon-proton collisions. Using the values for the color-octet matrix elements extracted from fits to prompt $J/\psi$ data at the Tevatron, we demonstrate that distinctive color-octet signatures should be visible in $J/\psi$ photoproduction. However, these predictions appear at variance with recent experimental data obtained at HERA, indicating that the phenomenological importance of the color-octet contributions is smaller than expected from theoretical considerations and suggested by the Tevatron fits., Published by APS, College Park, Md.
Published: 1996
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18. QCD corrections to inelastic J/$\psi$ photoproduction

Author: Krämerr, Michael
Subjects: bremsstrahlung: gluon, renormalization: dependence, gluon [bremsstrahlung], J/psi(3100) [photoproduction], electron p: inclusive reaction, energy spectrum, correction [quantum chromodynamics], fusion: photon gluon, gluon: bremsstrahlung, electroproduction: J/psi(3100), quantum chromodynamics: correction, photon quark [interaction], numerical calculations: interpretation of experiments, photoproduction [J/psi(3100)], interpretation of experiments [numerical calculations], inclusive reaction [photon p], J/psi(3100): photoproduction, spectrum: transverse momentum, ddc:530, higher-order [Feynman graph], interaction [photon quark], channel cross section: energy dependence, bremsstrahlung [gluon], J/psi(3100) [electroproduction], J/psi(3100): electroproduction, exchange [one-photon], Feynman graph: higher-order, perturbation theory: higher-order, dependence [renormalization], photoproduction: J/psi(3100), bibliography, one-photon: exchange, transverse momentum [spectrum], energy dependence [channel cross section], interaction: photon quark, electroproduction [J/psi(3100)], higher-order [perturbation theory], photon gluon [fusion], DESY HERA Stor, transverse momentum: spectrum, one-photon [exchange], spectrum [transverse momentum], inclusive reaction [electron p], photon p: inclusive reaction, photon quark: interaction, exchange: one-photon
Abstract: 42 pp. (1996)., We present a complete calculation of the higher-order perturbative QCD corrections to inelastic photoproduction of J / ψ particles. A comprehensive analysis of total cross sections and differential distributions for the energy range of the fixed-target experiments and for inelastic J/ψ photoproduction at HERA is performed. The cross section and the J / ψ energy spectrum are compared wth the available photoproduction data including first results from HERA. This analysis will not only provide information on the gluon distribution of the proton but appears to be a clean test for the underlying picture of quarkonium production as developed so far in the perturbative QCD sector.
Published: 1996
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19. Inclusive charged particle distributions in deep inelastic scattering events at HERA

Author: Derrick, M., Krakauer, D., Magill, S., Mikunas, D., Musgrave, B., Repond, J., Stanek, R., Talaga, R. L., Zhang, H., Bari, G., Basile, M., Bellagamba, L., Boscherini, D., Bruni, A., Bruni, G., Bruni, P., Cara Romeo, G., Castellini, G., Cifarelli, L., Cindolo, F., Contin, A., Corradi, M., Gialas, I., Giusti, P., Iacobucci, G., Laurenti, G., Levi, G., Margotti, A., Massam, T., Nania, R., Palmonari, F., Polini, A., Sartorelli, G., Zamora Garcia, Y., Zichichi, A., Bornheim, A., Crittenden, J., Desch, K., Diekmann, B., Doeker, T., Eckert, M., Feld, L., Frey, A., Geerts, M., Grothe, M., Hartmann, H., Heinloth, K., Heinz, L., Hilger, E., Jakob, H. P., Katz, U. F., Mengel, S., Mollen, J., Paul, E., Pfeiffer, M., Rembser, C., Schramm, D., Stamm, J., Wedemeyer, R., Campbell-Robson, S., Cassidy, A., Cottingham, W. N., Dyce, N., Foster, B., George, S., Hayes, M. E., Heath, G. P., Heath, Helen F., Morgado, C. J. S., O'Mara, J. A., Piccioni, D., Roff, D. G., Tapper, R. J., Yoshida, R., Rau, R. R., Arneodo, M., Ayad, R., Capua, M., Garfagnini, A., Iannotti, L., Schioppa, M., Susinno, G., Bernstein, A., Caldwell, A., Cartiglia, N., Parsons, J. A., Ritz, S., Sciulli, F., Straub, P. B., Wai, L., Yang, S., Zhu, Q., Borzemski, P., Chwastowski, J., Eskreys, A., Piotrzkowski, K., Zachara, M., Zawiejski, L., Adamczyk, L., Bednarek, B., Jelen, K., Kisielewska, D., Kowalski, T., Przybycien, M., Rulikowska-Zarebska, E., Suszycki, L., Zajac, J., Kotanski, A., Bauerdick, L. A. T., Behrens, U., Beier, H., Bienlein, J. K., Coldewey, C., Deppe, O., Desler, K., Drews, G., Flasinski, M., Gilkinson, D. J., Glasman, C., Gottlicher, P., Grosse-Knetter, J., Gutjahr, B., Haas, Tobias M., Hain, W., Hasell, D., Hessling, H., Iga, Y., Johnson, K., Joos, P., Kasemann, M., Klanner, R., Koch, W., Kopke, L., Kotz, U., Kowalski, H., Labs, J., Ladage, A., Lohr, B., Lowe, M., Luke, D., Mainusch, J., Manczak, O., Monteiro, T., Ng, J. S. T., Nickel, S., Notz, D., Ohrenberg, K., Roco, M., Rohde, M., Roldan, J., Schneekloth, U., Schulz, W., Selonke, F., Stiliaris, E., Surrow, B., Voss, T., Westphal, D., Wolf, G., Youngman, C., Zeuner, W., Zhou, J. F., Grabosch, H. J., Kharchilava, A., Leich, A., Mari, S. M., Mattingly, M., Meyer, A., Schlenstedt, S., Wulff, N., Barbagli, G., Gallo, E., Pelfer, P., Maccarrone, G., De Pasquale, S., Votano, L., Bamberger, A., Eisenhardt, S., Freidhof, A., Soldner-Rembold, S., Schroeder, J., Trefzger, T., Bromley, J. T., Brook, N. H., Bussey, P. J., Doyle, A. T., Saxon, D. H., Utley, M. L., Wilson, A. S., Dannemann, A., Holm, U., Horstmann, D., Neumann, T., Sinkus, R., Wick, K., Badura, E., Burow, B. D., Hagge, L., Lohrmann, E., Milewski, J., Nakahata, M., Pavel, N., Poelz, G., Schott, W., Zetsche, F., Bacon, T. C., Brummer, N., Butterworth, I., Harris, V. L., Hung, B. H. Y., Long, K. R., Miller, D. B., Morawitz, P. P. O., Prinias, A., Sedgbeer, J. K., Whitfield, A., Mallik, U., McCliment, E., Wang, M. Z., Wang, S. M., Wu, J. T., Cloth, P., Filges, D., An, S. H., Cho, G. H., Ko, B. J., Lee, S. B., Nam, S. W., Park, H. S., Park, S. K., Imlay, R., Kartik, S., Kim, H. J., McNeil, R. R., Metcalf, W., Nadendla, V. K., Barreiro, F., Cases, G., Fernandez, J. P., Graciani, R., Hernandez, J. M., Hervas, L., Labarga, L., Martinez, M., del Peso, J., Puga, J., Terron, J., de Troconiz, J. F., Corriveau, F., Hanna, D. S., Hartmann, J., Hung, L. W., Lim, J. N., Matthews, C., Patel, P. M., Sinclair, L. E., Stairs, D. G., St. Laurent, M., Ullmann, R., Zacek, G., Bashkirov, V., Dolgoshein, B. A., Stifutkin, A., Bashindzhagian, G. L., Ermolov, P. F., Gladilin, L. K., Golubkov, Yu. A., Kobrin, V. D. D., Korzhavina, I. A., Kuzmin, V. A., Lukina, O. Yu., Proskuryakov, A. S., Savin, A. A., Shcheglova, L. M., Solomin, A. N., Zotov, N. P., Botje, M., Chlebana, F., Dake, A., Engelen, J., de Kamps, M., Kooijman, P., Kruse, A., Tiecke, H., Verkerke, W., Vreeswijk, M., Wiggers, L., de Wolf, E., van Woudenberg, R., Acosta, D., Bylsma, B., Durkin, L. S., Gilmore, J., Honscheid, K., Li, C., Ling, T. Y., McLean, K. W., Nylander, P., Park, I. H., Romanowski, T. A., Seidlein, R., Bailey, David C., Byrne, A., Cashmore, R. J., Cooper-Sarkar, Amanda M., Devenish, R. C. E., Harnew, N., Lancaster, M., Lindemann, L., McFall, J., Nath, C., Noyes, V. A., Quadt, A., Tickner, J. R., Uijterwaal, H., Walczak, R., Waters, D. S., Wilson, F. F., Yip, T., Abbiendi, G., Bertolin, A., Brugnera, R., Carlin, R., Dal Corso, F., De Giorgi, M., Dosselli, U., Limentani, S., Morandin, M., Posocco, M., Stanco, L., Stroili, R., Voci, C., Bulmahn, J., Butterworth, J. M., Feild, R. G., Oh, B. Y., Okrasinski, J. R., Whitmore, J., D'Agostini, G., Marini, G., Nigro, A., Tassi, E., Hart, J. C., McCubbin, N. A., Prytz, K., Shah, T. P., Short, T. L., Barberis, E., Dubbs, T., Heusch, C., Van Hook, M., Lockman, William S., Rahn, J. T., Sadrozinski, H. F., Seiden, A., Williams, D. C., Biltzinger, J., Seifert, R. J., Schwarzer, O., Walenta, A. H., Zech, Gunter, Abramowicz, H., Briskin, G., Dagan, S., Levy, A., Fleck, J. I., Hasegawa, T., Hazumi, M., Ishii, T., Kuze, M., Mine, S., Nagasawa, Y., Nakao, M., Suzuki, I., Tokushuku, K., Yamada, S., Yamazaki, Y., Chiba, M., Hamatsu, R., Hirose, T., Homma, K., Kitamura, S., Nakamitsu, Y., Yamauchi, K., Cirio, R., Costa, M., Ferrero, M. I., Lamberti, L., Maselli, S., Peroni, C., Sacchi, R., Solano, A., Staiano, A., Dardo, M., Benard, F., Brkic, M., Hartner, G. F., Joo, K. K., Levman, G. M., Martin, J. F., Orr, R. S., Polenz, S., Sampson, Cortney R., Teuscher, R. J., Catterall, C. D., Jones, T. W., Kaziewicz, P. B., Lane, J. B., Saunders, R. L., Shulman, J., Blankenship, K., Lu, B., Mo, L. W., Bogusz, W., Charchula, K., Ciborowski, J., Gajewski, J., Grzelak, G., Kasprzak, M., Krzyzanowski, M., Muchorowski, K., Nowak, R. J., Pawlak, J. M., Tymieniecka, T., Wroblewski, A. K., Zakrzewski, Janusz Andrzej, Zarnecki, A. F., Adamus, M., Eisenberg, Y., Karshon, U., Revel, D., Zer-Zion, D., Ali, I., Badgett, W. F., Behrens, B., Dasu, S., Fordham, C., Foudas, C., Goussiou, A., Loveless, R. J., Reeder, D. D., Silverstein, S., Smith, W. H., Vaiciulis, A., Wodarczyk, M., Tsurugai, T., Bhadra, S., Cardy, M. L., Fagerstroem, C. P., Frisken, William R., Khakzad, M., Murray, W. N., Schmidke, W. B., and ZEUS Collaboration
Subjects: electron p: deep inelastic scattering, gap [rapidity], electron p [deep inelastic scattering], electron p: inclusive reaction, energy spectrum, hadron [electroproduction], electroproduction: charged particle, electroproduction [charged particle], 296 GeV-cms, hadron: electroproduction, electroproduction [hadron], deep inelastic scattering: electron p, spectrum: transverse momentum, charged particle [electroproduction], ddc:530, charged particle: electroproduction, colliding beams [electron p], electroproduction: hadron, bibliography, ZEUS, electron p [colliding beams], transverse momentum [spectrum], rapidity: gap, colliding beams: electron p, DESY HERA Stor, electron p: colliding beams, transverse momentum: spectrum, deep inelastic scattering [electron p], spectrum [transverse momentum], inclusive reaction [electron p], experimental results
Abstract: 34 pp. (1996)., A measurement of inclusive charged particle distributions in deep inelastic $ep$ scattering for $\gamma~* p$ centre-of-mass energies $75< W < 175$GeV and momentum transfer squared $10< Q~2 < 160$GeV$~2$ from the ZEUS detector at HERA is presented. The differential charged particle rates in the $\gamma~* p$ centre-of-mass system as a function of the scaled longitudinal momentum, $x_F$, and of the transverse momentum, $p_t~*$ and $\,\,$ , as a function of $x_F$, $W$ and $Q~2$ are given. Separate distributions are shown for events with (LRG) and without (NRG) a rapidity gap with respect to the proton direction. The data are compared with results from experiments at lower beam energies, with the naive quark parton model and with parton models including perturbative QCD corrections. The comparison shows the importance of the higher order QCD processes. Significant differences of the inclusive charged particle rates between NRG and LRG events at the same $W$ are observed. The value of $\,\,$ for LRG events with a hadronic mass $M_X$, which excludes the forward produced baryonic system, is similar to the $\,\,$ value observed in fixed target experiments at $W \approx M_X$.
Published: 1996
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20. Measurement of the proton diffractive structure function at HERA using the ZEUS detector

Author: Przybycien, Mariusz
Subjects: electron p: deep inelastic scattering, thesis, electron p: inclusive reaction, diffraction, bibliography, ZEUS, 296 GeV-cms, colliding beams: electron p, model: pomeron, DESY HERA Stor, electron p: colliding beams, deep inelastic scattering: electron p, hard scattering: diffraction, model: factorization, p: structure function, diffraction: hard scattering, total cross section, experimental results
Abstract: Jagellonian University, Diss., 1995; 75 pp. (1995). = Jagellonian University, Diss., 1995
Published: 1995
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21. Cross-sections for charm production in $e$ $p$ collisions: Massive versus massless scheme

Author: Kniehl, Bernd A., Kraemer, Martin, Kramer, G., and Spira, M.
Subjects: photoproduction [quark], transverse momentum: high, electron p: inclusive reaction, structure function [p], electroproduction [quark], high [transverse momentum], photoproduction: quark, massless [quark], quark: charm, quark: massless, charm [quark], spectrum: transverse momentum, ddc:530, photon: structure function, quark: electroproduction, p: structure function, electroproduction: quark, numerical calculations, exchange [one-photon], mass: charm, massless: quark, one-photon: exchange, transverse momentum [spectrum], quark: photoproduction, charm: mass, structure function [photon], DESY HERA Stor, rapidity spectrum, quark [photoproduction], mass [charm], transverse momentum: spectrum, one-photon [exchange], 115-275 GeV-cms (photon p), charm [mass], quark [electroproduction], spectrum [transverse momentum], inclusive reaction [electron p], quark [massless], exchange: one-photon
Abstract: 11 pp. (1995)., The next-to-leading order inclusive cross section for large- p ⊥ photoproduction of charm quarks at HERA is calculated in two different approaches. In the first approach the charm quarks are treated as massive objects which are strictly external to the proton and the photon while in the second approach the charm mass is neglected and the c quark is assumed to be one of the active flavours in the proton and photon structure functions. We present single-inclusive distributions in transverse momentum and rapidity including direct and resolved photons. The cross section in the massless approach is found to be significantly larger than in the massive scheme. The deviation originates from several contributions which are disentangled. We argue that large- p ⊥ photoproduction of charm quarks at HERA will be sensitive to the charm content of the photon structure function.
Published: 1995
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22. Experimental study of hard photon radiation processes at HERA

Author: Ahmed, T., Aid, S., Andreev, V., Andrieu, B., Appuhn, R. D., Arpagaus, M., Babaev, A., Baehr, J., Ban, J., Baranov, P., Barrelet, E., Bartel, W., Barth, M., Bassler, U., Beck, H. P., Behrend, H. J., Belousov, A., Berger, Christoph, Bergstein, H., Bernardi, G., Bernet, R., Bertrand-Coremans, G., Besancon, M., Beyer, R., Biddulph, P., Bizot, J. C., Blobel, V., Borras, K., Botterweck, F., Boudry, V., Braemer, A., Brasse, F., Braunschweig, W., Brisson, V., Bruncko, D., Brune, C., Buchholz, R., Bungener, L., Burger, J., Busser, F. W., Bunyatyan, A., Burke, Stephen, Buschhorn, G., Campbell, A. J., Carli, T., Charles, F., Clarke, D., Clegg, Arthur B., Clerbaux, B., Colombo, M., Contreras, J. G., Cormack, C., Coughlan, J. A., Courau, A., Coutures, C., Cozzika, G., Criegee, L., Cussans, D. G., Cvach, J., Dagoret, S., Dainton, J. B., Danilov, M., Dau, W. D., Daum, K., David, M., Deffur, E., Delcourt, B., Del Buono, L., de Roeck, A., De Wolf, E. A., Di Nezza, P., Dollfus, C., Dowell, J. D., Dreis, H. B., Droutskoi, V., Duboc, J., Duellmann, Dirk, Dunger, O., Duhm, H., Ebert, J., Ebert, T. R., Eckerlin, Guenter, Efremenko, V., Egli, S., Ehrlichmann, H., Eichenberger, S., Eichler, R., Eisele, F., Eisenhandler, E., Ellison, R. J., Elsen, E., Erdmann, M., Erdmann, W., Evrard, E., Favart, L., Fedotov, A., Feeken, D., Felst, R., Feltesse, J., Ferencei, J., Ferrarotto, F., Flamm, K., Fleischer, M., Flieser, M., Flugge, G., Fomenko, A., Fominykh, B., Forbush, M., Formanek, J., Foster, J. M., Franke, G., Fretwurst, E., Gabathuler, E., Gabathuler, K., Gamerdinger, K., Garvey, J., Gayler, Joerg, Gebauer, M., Gellrich, A., Genzel, H., Gerhards, R., Goerlach, U., Goerlich, L., Gogitidze, N., Goldberg, M., Goldner, D., Gonzalez-Pineiro, B., Gorelov, I., Gorichev, P., Grab, C., Grassler, H., Grassler, R., Greenshaw, T., Grindhammer, Guenter, Gruber, A., Gruber, C., Haack, J., Haidt, D., Hajduk, L., Hamon, O., Hampel, M., Hanlon, E. M., Hapke, M., Haynes, W. J., Heatherington, J., Heinzelmann, G., Henderson, R. C. W., Henschel, H., Herma, R., Herynek, I., Hess, M. F., Hildesheim, W., Hill, P., Hiller, K. H., Hilton, C. D., Hladky, J., Hoeger, K. C., Hoppner, M., Horisberger, R., Hudgson, V. L., Huet, P., Hutte, M., Hufnagel, H., Ibbotson, M., Itterbeck, H., Jabiol, M. A., Jacholkowska, A., Jacobsson, C., Jaffre, M., Janoth, J., Jansen, T., Jonsson, L., Johannsen, K., Johnson, D. P., Johnson, L., Jung, H., Kalmus, P. I. P., Kant, D., Kaschowitz, R., Kasselmann, P., Kathage, U., Katzy, J., Kaufmann, H. H., Ghazaryan, Samvel, Kenyon, I. R., Kermiche, S., Keuker, C., Kiesling, Christian M., Klein, M., Kleinwort, C., Knies, G., Ko, W., Kohler, T., Kohne, J., Kolanoski, H., Kole, F., Kolya, S. D., Korbel, V., Korn, M., Kostka, P., Kotelnikov, S. K., Kramerkamper, T., Krasny, M. W., Krehbiel, H., Krucker, D., Kruger, U., Kruner-Marquis, U., Kubenka, J. P., Kuster, H., Kuhlen, M., Kurca, T., Kurzhofer, J., Kuznik, B., Lacour, D., Lamarche, F., Lander, R., Landon, M. P. J., Lange, W., Lanius, P., Laporte, J. F., Lebedev, A., Leverenz, C., Levonian, S., Ley, C., Lindner, A., Lindstrom, G., Linsel, F., Lipinski, J., List, B., Loch, P., Lohmander, H., Lopez, G. C., Lyubimov, V., Luke, D., Magnussen, N., Malinovski, E., Mani, S., Maracek, R., Marage, P., Marks, J., Marshall, R., Martens, J., Martin, R., Martyn, H. U., Martyniak, J., Masson, S., Mavroidis, T., Maxfield, S. J., McMahon, S. J., Mehta, A., Meier, K., Mercer, D., Merz, T., Meyer, C. A., Meyer, H., Meyer, J., Mikocki, S., Milstead, D., Moreau, F., Morris, J. V., Mroczko, E., Muller, G., Muller, K., Murin, P., Nagovizin, V., Nahnhauer, R., Naroska, B., Naumann, T., Newman, Paul R., Newton, D., Neyret, D., Nguyen, H. K., Nicholls, T. C., Niebergall, F., Niebuhr, C., Nisius, R., Nowak, G., Noyes, G. W., Nyberg-Werther, M., Oakden, M., Oberlack, H., Obrock, U., Olsson, J. E., Ozerov, D., Panaro, E., Panitch, A., Pascaud, C., Patel, G. D., Peppel, E., Perez, E., Phillips, J. P., Pichler, C., Pitzl, D., Pope, G., Prell, Soeren A., Prosi, R., Radel, G., Raupach, F., Reimer, P., Reinshagen, S., Ribarics, P., Rick, H., Riech, V., Riedlberger, J., Riess, S., Rietz, M., Rizvi, E., Robertson, S. M., Robmann, P., Roloff, H. E., Roosen, R., Rosenbauer, K., Rostovtsev, A., Rouse, F., Royon, C., Ruter, K., Rusakov, S., Rybicki, K., Rylko, R., Sahlmann, N., Sanchez, E., Sankey, D. P., Savitsky, M., Schacht, P., Schiek, S., Schleper, P., von Schlippe, W., Schmidt, C., Schmidt, D., Schmidt, G., Schoning, A., Schroder, V., Schuhmann, E., Schwab, B., Schwind, A., Seehausen, U., Sefkow, F., Seidel, M., Sell, R., Semenov, A., Chekelian, V. I., Sheviakov, I., Shooshtari, H., Shtarkov, L. N., Siegmon, G., Siewert, U., Sirois, Y., Skillicorn, I. O., Smirnov, P., Smith, J. R., Solochenko, V., Solovev, Ya., Spiekermann, J., Spitzer, H., Starosta, R., Steenbock, M., Steffen, P., Steinberg, R., Stella, B., Stephens, K., Stier, J., Stiewe, J., Stosslein, U., Stolze, K., Strachota, J., Straumann, U., Struczinski, W., Sutton, J. P., Tapprogge, S., Taylor, Richard E., Chernyshov, V., Thiebaux, C., Thompson, Graham, Truoel, Peter, Turnau, J., Tutas, J., Ulkes, P., Usik, A., Valkar, S., Valkarova, A., Vallee, C., Van Esch, P., Van Mechelen, P., Vartapetian, A., Vazdik, Y., Vecko, M., Verrecchia, P., Villet, G., Wacker, K., Wagener, A., Wagener, M., Walker, I. W., Walther, A., Weber, G., Weber, M., Wegener, D., Wegner, A., Wellisch, H. P., West, L. R., Willard, S., Winde, M., Winter, G. G., Wright, A. E., Wunsch, E., Wulff, N., Yiou, T. P., Zacek, J., Zarbock, D., Zhang, Z., Zhokin, A., Zimmer, M., Zimmermann, W., Zomer, F., Zuber, K., and H1 Collaboration
Subjects: photon [electroproduction], +p+electron+photon%22">electron p --> p electron photon, electron p: inclusive reaction, 296 GeV-cms, bremsstrahlung, +electron+photon+anything%22">electron p --> electron photon anything, momentum transfer: differential cross section, differential cross section: momentum transfer, deep inelastic scattering, radiative correction, electron p: exclusive reaction, ddc:530, momentum transfer [differential cross section], energy: correlation, colliding beams [electron p], (electron): energy spectrum, DESY DESY HERA Stor Stor, electroproduction: photon, energy spectrum: (electron), differential cross section [momentum transfer], electron p [colliding beams], photon: electroproduction, luminosity: measurement, exclusive reaction [electron p], colliding beams: electron p, correlation [energy], electron p: colliding beams, measurement [luminosity], energy spectrum [(electron)], (electron) [energy spectrum], H1, electroproduction [photon], inclusive reaction [electron p], Compton scattering, experimental results
Abstract: 16 pp. (1995)., 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.
Published: 1995

23. Inclusive transverse momentum distributions of charged particles in diffractive and non-diffractive photoproduction at HERA

Author: Derrick, M., Krakauer, D., Magill, S., Mikunas, D., Musgrave, B., Repond, J., Stanek, R., Talaga, R. L., Zhang, H., Ayad, R., Bari, G., Basile, M., Bellagamba, L., Boscherini, D., Bruni, A., Bruni, G., Bruni, P., Cara Romeo, G., Castellini, G., Chiarini, M., Cifarelli, L., Cindolo, F., Contin, A., Corradi, M., Gialas, I., Giusti, P., Iacobucci, G., Laurenti, G., Levi, G., Margotti, A., Massam, T., Nania, R., Nemoz, C., Palmonari, F., Polini, A., Sartorelli, G., Timellini, R., Zamora Garcia, Y., Zichichi, A., Bargende, A., Crittenden, J., Desch, K., Diekmann, B., Doeker, T., Eckert, M., Feld, L., Frey, A., Geerts, M., Geitz, G., Grothe, M., Haas, Tobias M., Hartmann, H., Haun, D., Heinloth, K., Hilger, E., Jakob, H. P., Katz, U. F., Mari, S. M., Mass, A., Mengel, S., Mollen, J., Paul, E., Rembser, C., Schattevoy, R., Schramm, D., Stamm, J., Wedemeyer, R., Campbell-Robson, S., Cassidy, A., Dyce, N., Foster, B., George, S., Gilmore, R., Heath, G. P., Heath, Helen F., Llewellyn, T. J., Morgado, C. J. S., Norman, D. J. P., O'Mara, J. A., Tapper, R. J., Wilson, S. S., Yoshida, R., Rau, R. R., Arneodo, M., Iannotti, L., Schioppa, M., Susinno, G., Bernstein, A., Caldwell, A., Cartiglia, N., Parsons, J. A., Ritz, S., Sciulli, F., Straub, P. B., Wai, L., Yang, S., Zhu, Q., Borzemski, P., Chwastowski, J., Eskreys, A., Piotrzkowski, K., Zachara, M., Zawiejski, L., Adamczyk, L., Bednarek, B., Jelen, K., Kisielewska, D., Kowalski, T., Rulikowska-Zarebska, E., Suszycki, L., Zajac, J., Kotanski, A., Przybycien, M., Bauerdick, L. A. T., Behrens, U., Beier, H., Bienlein, J. K., Coldewey, C., Deppe, O., Desler, K., Drews, G., Flasinski, M., Gilkinson, D. J., Glasman, C., Gottlicher, P., Grosse-Knetter, J., Gutjahr, B., Hain, W., Hasell, D., Hessling, H., Iga, Y., Joos, P., Kasemann, M., Klanner, R., Koch, W., Koepke, L., Kotz, U., Kowalski, H., Labs, J., Ladage, A., Lohr, B., Loewe, M., Luke, D., Manczak, O., Monteiro, T., Ng, J. S. T., Nickel, S., Notz, D., Ohrenberg, K., Roco, M., Rohde, M., Roldan, J., Schneekloth, U., Schulz, W., Selonke, F., Stiliaris, E., Surrow, B., Voss, T., Westphal, D., Wolf, G., Youngman, C., Zhou, J. F., Grabosch, H. J., Kharchilava, A., Leich, A., Mattingly, M. C. K., Meyer, A., Schlenstedt, S., Wulff, N., Barbagli, G., Pelfer, P., Anzivino, G., Maccarrone, G., Votano, L., Bamberger, A., Eisenhardt, S., Freidhof, A., Soldner-Rembold, S., Schroder, J., Theisen, G., Trefzger, T., Brook, N. H., Bussey, P. J., Doyle, A. T., Fleck, I., Saxon, D. H., Utley, M. L., Wilson, A. S., Dannemann, A., Holm, U., Horstmann, D., Neumann, T., Sinkus, R., Wick, K., Badura, E., Burow, B. D., Hagge, L. A., Lohrmann, E., Mainusch, J., Milewski, J., Nakahata, M., Pavel, N., Poelz, G., Schott, W., Zetsche, F., Bacon, T. C., Butterworth, I., Gallo, E., Harris, V. L., Hung, B. H., Long, K. R., Miller, D. B., Morawitz, P. P. O., Prinias, A., Sedgbeer, J. K., Whitfield, A. F., Mallik, U., McCliment, E., Wang, M. Z., Wang, S. M., Wu, J. T., Zhang, Y., Cloth, P., Filges, D., An, S. H., Hong, S. M., Kim, T. Y., Nam, S. W., Park, S. K., Suh, M. H., Yon, S. H., Imlay, R., Kartik, S., Kim, H. J., McNeil, R. R., Metcalf, W., Nadendla, V. K., Barreiro, F., Cases, G., Graciani, R., Hernandez, J. M., Hervas, L., Labarga, L., del Peso, J., Puga, J., Terron, J., de Troconiz, J. F., Smith, G. R., Corriveau, F., Hanna, D. S., Hartmann, J., Hung, L. W., Lim, J. N., Matthews, C. G., Patel, P. M., Sinclair, L. E., Stairs, D. G., St. Laurent, M., Ullmann, R., Zacek, G., Bashkirov, V., Dolgoshein, B. A., Stifutkin, A., Bashindzhagian, G. L., Ermolov, P. F., Gladilin, L. K., Golubkov, Y. A., Kobrin, V. D. D., Kuzmin, V. A., Proskuryakov, A. S., Savin, A. A., Shcheglova, L. M., Solomin, A. N., Zotov, N. P., Botje, M., Chlebana, F., Dake, A., Engelen, J., de Kamps, M., Kooijman, P., Kruse, A., Tiecke, H., Verkerke, W., Vreeswijk, M., Wiggers, L., de Wolf, E., van Woudenberg, R., Acosta, D., Bylsma, B., Durkin, L. S., Honscheid, K., Li, C., Ling, T. Y., McLean, K. W., Murray, W. N., Park, I. H., Romanowski, T. A., Seidlein, R., Bailey, D. S., Blair, G. A., Byrne, A., Cashmore, R. J., Cooper-Sarkar, Amanda M., Daniels, D., Devenish, R. C. E., Harnew, N., Lancaster, M., Luffman, P. E., Lindemann, L., McFall, J., Nath, C., Noyes, V. A., Quadt, A., Uijterwaal, H., Walczak, R., Wilson, F. F., Yip, T., Abbiendi, G., Bertolin, A., Brugnera, R., Carlin, R., Dal Corso, F., De Giorgi, M., Dosselli, U., Limentani, S., Morandin, M., Posocco, M., Stanco, L., Stroili, R., Voci, C., Bulmahn, J., Butterworth, J. M., Feild, R. G., Oh, B. Y., Whitmore, J. J., D'Agostini, G., Marini, G., Nigro, A., Tassi, E., Hart, J. C., McCubbin, N. A., Prytz, K., Shah, T. P., Short, T. L., Barberis, E., Dubbs, T., Heusch, C., Van Hook, M., Hubbard, B., Lockman, William S., Rahn, J. T., Sadrozinski, H. F. W., Seiden, A., Biltzinger, J., Seifert, R. J., Walenta, A. H., Zech, Gunter, Abramowicz, H., Briskin, G., Dagan, S., Levy, A., Hasegawa, T., Hazumi, M., Ishii, T., Kuze, M., Mine, S., Nagasawa, Y., Nakao, M., Suzuki, I., Tokushuku, K., Yamada, S., Yamazaki, Y., Chiba, M., Hamatsu, R., Hirose, T., Homma, K., Kitamura, S., Nakamitsu, Y., Yamauchi, K., Cirio, R., Costa, M., Ferrero, M. I., Lamberti, L., Maselli, S., Peroni, C., Sacchi, R., Solano, A., Staiano, A., Dardo, M., Bailey, David C., Bandyopadhyay, D., Benard, F., Brkic, M., Crombie, M. B., Gingrich, D. M., Hartner, G. F., Joo, K. K., Levman, G. M., Martin, J. F., Orr, R. S., Sampson, Cortney R., Teuscher, R. J., Catterall, C. D., Jones, T. W., Kaziewicz, P. B., Lane, J. B., Saunders, R. L., Shulman, J., Blankenship, K., Lu, B., Mo, L. W., Bogusz, W., Charchula, K., Ciborowski, J., Gajewski, J., Grzelak, G., Kasprzak, M., Krzyzanowski, M., Muchorowski, K., Nowak, R. J., Pawlak, J. M., Tymieniecka, T., Wroblewski, A. K., Zakrzewski, Janusz Andrzej, Zarnecki, A. F., Adamus, M., Eisenberg, Y., Karshon, U., Revel, D., Zer-Zion, D., Ali, I., Badgett, W. F., Behrens, B., Dasu, S., Fordham, C., Foudas, C., Goussiou, A., Loveless, R. J., Reeder, D. D., Silverstein, S., Smith, W. H., Vaiciulis, A., Wodarczyk, M., Tsurugai, T., Bhadra, S., Cardy, M. L., Fagerstroem, C. P., Frisken, William R., Furutani, K. M., Khakzad, M., Schmidke, W. B., and ZEUS Collaboration
Subjects: perturbation theory [quantum chromodynamics], DESY DESY HERA Stor Stor, charged particle [photoproduction], nondiffractive, electron p: inclusive reaction, diffraction, ZEUS, electron p [colliding beams], transverse momentum [spectrum], charged particle: photoproduction, 296 GeV-cms, colliding beams: electron p, electron p: colliding beams, photoproduction [charged particle], transverse momentum: spectrum, spectrum: transverse momentum, ddc:530, spectrum [transverse momentum], quantum chromodynamics: perturbation theory, inclusive reaction [electron p], photoproduction: charged particle, colliding beams [electron p], experimental results
Abstract: 18 pp. (1995)., Inclusive transverse momentum spectra of charged particles in photoproduction events in the laboratory pseudorapidity range $-1.2
Published: 1995
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24. Jet production at HERA with the ZEUS detector: Resolved and direct processes in photoproduction and the gluon content of the proton and the photon

Author: Glasman, Claudia
Subjects: jet: photoproduction, rapidity dependence: differential cross section, transverse momentum: high, differential cross section: rapidity dependence, thesis, electron p: inclusive reaction, diffraction, gluon: momentum spectrum, ZEUS, (2jet): final state, 296 GeV-cms, final state: (2jet), colliding beams: electron p, transverse energy: differential cross section, DESY HERA Stor, electron p: colliding beams, momentum transfer: low, photoproduction: jet, particle identification: (hadron electron), p: structure function, showers: parton, photon: resolved, differential cross section: transverse energy, leading logarithm approximation, experimental results
Abstract: Weizmann Institute of Science, Diss., 1995; 131 pp. (1995). = Weizmann Institute of Science, Diss., 1995
Published: 1995
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25. Diffractive photoproduction of jets with a direct pomeron coupling at HERA

Author: Kniehl, Bernd A., Kohrs, H. G., and Kramer, G.
Subjects: structure function: pomeron, pomeron: exchange, jet: photoproduction, effective Lagrangian, interpretation of experiments: DESY HERA Stor, electron p: inclusive reaction, diffraction, one-photon: exchange, (2jet): final state, (quark pomeron): coupling, model: parton, electroproduction: jet, final state: (2jet), jet: electroproduction, exchange: pomeron, rapidity spectrum, coupling: (quark pomeron), photoproduction: jet, transverse momentum: spectrum, spectrum: transverse momentum, photon p: inclusive reaction, numerical calculations, exchange: one-photon
Abstract: We investigate in detail the effect of a direct pomeron coupling to quarks on the production of jets in $ep$ scattering with almost real photons. Jet production via a direct pomeron coupling is compared with the resolved--pomeron mechanism. We consider both direct and resolved photoproduction. Rapidity and transverse momentum distributions are calculated and compared with preliminary H1 and ZEUS data.
Published: 1995
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26. Single jet photoproduction at HERA in next-to-leading order QCD

Author: Kramer, G. and Salesch, S. G.
Subjects: Born approximation, renormalization: dependence, jet: photoproduction, higher-order [correction], electron p: inclusive reaction, transverse momentum [cross section], dependence [renormalization], photoproduction [jet], rapidity dependence [cross section], model: parton, parton [model], jet [photoproduction], hard scattering, structure function [photon], photoproduction: jet, numerical calculations: DESY HERA Stor, quantum chromodynamics, DESY HERA Stor [numerical calculations], cross section: transverse momentum, cross section: rapidity dependence, photon: structure function, ddc:530, inclusive reaction [electron p], correction: higher-order
Abstract: 23 pp. (1994)., We present results for next-to-leading order calculations of single jet inclusive cross sections by resolved photons inep-collisions at HERA. The dependence on the jet recombination cut and on the choice of the renormalization and factorization scales is studied in detail.
Published: 1994

27. Untersuchung der Erzeugung schwerer Quarks durch ihren Zerfall in Myonen im H1-Detektor bei HERA

Author: Krueger, Ulrike
Subjects: channel cross section, thesis, electron p: inclusive reaction, momentum spectrum, bibliography, quark: semileptonic decay, 296 GeV-cms, muon: direct production, fusion: boson gluon, colliding beams: electron p, quark: pair production, pair production: quark, DESY HERA Stor, electron p: colliding beams, transverse momentum: spectrum, spectrum: transverse momentum, semileptonic decay: quark, H1, heavy quark, angular distribution, quark: electroproduction, electroproduction: quark, direct production: muon, numerical calculations: Monte Carlo, experimental results
Abstract: 128 pp. (1994).
Published: 1994
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28. Photoproduction of J /$\psi$ mesons at HERA

Author: Ahmed, T., Aid, S., Andreev, V., Andrieu, B., Appuhn, R. D., Arpagaus, M., Babaev, A., Bahr, J., Ban, J., Baranov, P., Barrelet, E., Bartel, W., Barth, M., Bassler, U., Beck, H. P., Behrend, H. J., Belousov, A., Berger, Christoph, Bergstein, H., Bernardi, G., Bernet, R., Bertrand-Coremans, G., Besancon, M., Beyer, R., Biddulph, P., Bizot, J. C., Blobel, V., Borras, K., Botterweck, F., Boudry, V., Braemer, A., Brasse, F., Braunschweig, W., Brisson, V., Bruncko, D., Brune, C., Buchholz, R., Bungener, L., Burger, J., Busser, F. W., Bunyatyan, A., Burke, Stephen, Buschhorn, G., Campbell, A. J., Carli, T., Charles, F., Clarke, D., Clegg, Arthur B., Colombo, M., Contreras, J. G., Coughlan, J. A., Courau, A., Coutures, C., Cozzika, G., Criegee, L., Cussans, D. G., Cvach, J., Dagoret, S., Dainton, J. B., Danilov, M., Dau, W. D., Daum, K., David, M., Deffur, E., Delcourt, B., Del Buono, L., de Roeck, A., De Wolf, E. A., Di Nezza, P., Dollfus, C., Dowell, J. D., Dreis, H. B., Duboc, J., Duellmann, Dirk, Dunger, O., Duhm, H., Ebert, J., Ebert, T. R., Eckerlin, Guenter, Efremenko, V., Egli, S., Ehrlichmann, H., Eichenberger, S., Eichler, R., Eisele, F., Eisenhandler, E., Ellison, R. J., Elsen, E., Erdmann, M., Erdmann, W., Evrard, E., Favart, L., Fedotov, A., Feeken, D., Felst, R., Feltesse, J., Ferencei, J., Ferrarotto, F., Flamm, K., Fleischer, M., Flieser, M., Flugge, G., Fomenko, A., Fominykh, B., Forbush, M., Formanek, J., Foster, J. M., Franke, G., Fretwurst, E., Gabathuler, E., Gabathuler, K., Gamerdinger, K., Garvey, J., Gayler, Joerg, Gebauer, M., Gellrich, A., Genzel, H., Gerhards, R., Goerlach, U., Goerlich, L., Gogitidze, N., Goldberg, M., Goldner, D., Gonzalez-Pineiro, B., Goodall, A. M., Gorelov, I., Gorichev, P., Grab, C., Grassler, H., Grassler, R., Greenshaw, T., Grindhammer, Guenter, Gruber, A., Gruber, C., Haack, J., Haidt, D., Hajduk, L., Hamon, O., Hampel, M., Hanlon, E. M., Hapke, M., Haynes, W. J., Heatherington, J., Hedberg, V., Heinzelmann, G., Henderson, R. C. W., Henschel, H., Herma, R., Herynek, I., Hess, M. F., Hildesheim, W., Hill, P., Hiller, K. H., Hilton, C. D., Hladky, J., Hoeger, K. C., Hoppner, M., Horisberger, R., Huet, P., Hufnagel, H., Ibbotson, M., Itterbeck, H., Jabiol, M. A., Jacholkowska, A., Jacobsson, C., Jaffre, M., Janoth, J., Jansen, T., Jonsson, L., Johannsen, K., Johnson, D. P., Johnson, L., Jung, H., Kalmus, P. I. P., Kant, D., Kaschowitz, R., Kasselmann, P., Kathage, U., Kaufmann, H. H., Ghazaryan, Samvel, Kenyon, I. R., Kermiche, S., Keuker, C., Kiesling, Christian M., Klein, M., Kleinwort, C., Knies, G., Ko, W., Kohler, T., Kolanoski, H., Kole, F., Kolya, S. D., Korbel, V., Korn, M., Kostka, P., Kotelnikov, S. K., Krasny, M. W., Krehbiel, H., Krucker, D., Kruger, U., Kruner-Marquis, U., Kubenka, J. P., Kuster, H., Kuhlen, M., Kurca, T., Kurzhofer, J., Kuznik, B., Lacour, D., Lamarche, F., Lander, R., Landon, M. P. J., Lange, W., Lanius, P., Laporte, J. F., Lebedev, A., Leverenz, C., Levonian, S., Ley, C., Lindner, A., Lindstrom, G., Linsel, F., Lipinski, J., List, B., Loch, P., Lohmander, H., Lopez, G. C., Luke, D., Magnussen, N., Malinovski, E., Mani, S., Maracek, R., Marage, P., Marks, J., Marshall, R., Martens, J., Martin, R., Martyn, H. U., Martyniak, J., Masson, S., Mavroidis, T., Maxfield, S. J., McMahon, S. J., Mehta, A., Meier, K., Mercer, D., Merz, T., Meyer, C. A., Meyer, H., Meyer, J., Mikocki, S., Milstead, D., Moreau, F., Morris, J. V., Muller, G., Muller, K., Murin, P., Nagovizin, V., Nahnhauer, R., Naroska, B., Naumann, T., Newman, Paul R., Newton, D., Neyret, D., Nguyen, H. K., Niebergall, F., Niebuhr, C., Nisius, R., Nowak, G., Noyes, G. W., Nyberg-Werther, M., Oberlack, H., Obrock, U., Olsson, J. E., Panaro, E., Panitch, A., Pascaud, C., Patel, G. D., Peppel, E., Perez, E., Phillips, J. P., Pichler, C., Pitzl, D., Pope, G., Prell, Soeren A., Prosi, R., Radel, G., Raupach, F., Reimer, P., Reinshagen, S., Ribarics, P., Riech, V., Riedlberger, J., Riess, S., Rietz, M., Robertson, S. M., Robmann, P., Roloff, H. E., Roosen, R., Rosenbauer, K., Rostovtsev, A., Rouse, F., Royon, C., Ruter, K., Rusakov, S., Rybicki, K., Rylko, R., Sahlmann, N., Sanchez, E., Sankey, D. P., Savitsky, M., Schacht, P., Schiek, S., Schleper, P., von Schlippe, W., Schmidt, C., Schmidt, D., Schmitz, G., Schoning, A., Schroder, V., Schuhmann, E., Schwab, B., Schwind, A., Seehausen, U., Sefkow, F., Seidel, M., Sell, R., Semenov, A., Chekelian, V. I., Sheviakov, I., Shooshtari, H., Shtarkov, L. N., Siegmon, G., Siewert, U., Sirois, Y., Skillicorn, I. O., Smirnov, P., Smith, J. R., Solovev, Ya., Spitzer, H., Starosta, R., Steenbock, M., Steffen, P., Steinberg, R., Stella, B., Stephens, K., Stier, J., Stiewe, J., Stosslein, U., Strachota, J., Straumann, U., Struczinski, W., Sutton, J. P., Tapprogge, S., Taylor, Richard E., Chernyshov, V., Thiebaux, C., Thompson, Graham, Tikhomirov, I., Truoel, Peter, Turnau, J., Tutas, J., Ulkes, P., Usik, A., Valkar, S., Valkarova, A., Vallee, C., Van Esch, P., Van Mechelen, P., Vartapetian, A., Vazdik, Y., Vecko, M., Verrecchia, P., Villet, G., Wacker, K., Wagener, A., Wagener, M., Walker, I. W., Walther, A., Weber, G., Weber, M., Wegener, D., Wegner, A., Wellisch, H. P., West, L. R., Willard, S., Winde, M., Winter, G. G., Wright, A. E., Wunsch, E., Wulff, N., Yiou, T. P., Zacek, J., Zarbock, D., Zhang, Z., Zimmer, M., Zimmermann, W., Zomer, F., Zuber, K., and H1 Collaboration
Subjects: spectrum: momentum transfer, electron p: inclusive reaction, J/psi(3100) [photoproduction], electroproduction: J/psi(3100), +muon%2B+muon%22">J/psi(3100) --> muon+ muon, momentum transfer [spectrum], transverse momentum [differential cross section], 296 GeV-cms, +positron+electron%22">J/psi(3100) --> positron electron, leptonic decay: J/psi(3100), differential cross section [transverse momentum], photoproduction [J/psi(3100)], J/psi(3100): photoproduction, inclusive reaction [photon p], transverse momentum: differential cross section, +J%2Fpsi%283100%29+anything%22">electron p --> J/psi(3100) anything, ddc:530, channel cross section: energy dependence, J/psi(3100) [electroproduction], J/psi(3100): electroproduction, colliding beams [electron p], DESY DESY HERA Stor Stor, photoproduction: J/psi(3100), electron p [colliding beams], energy dependence [channel cross section], J/psi(3100) [leptonic decay], electroproduction [J/psi(3100)], colliding beams: electron p, J/psi(3100): leptonic decay, electron p: colliding beams, differential cross section: transverse momentum, H1, momentum transfer: spectrum, spectrum [momentum transfer], leptonic decay [J/psi(3100)], photon p: inclusive reaction, inclusive reaction [electron p], experimental results
Abstract: 13 pp. (1994)., We present a study of J ψ meson production in collisions of 26.7 GeV electrons with 820 GeV protons, performed with the H1-detector at the HERA collider at DESY. The J ψ mesons are detected via their leptonic decays both to electrons and muons. Requiring exactly two particles in the detector, a cross section of σ(ep → J ψ X) = (8.8±2.0±2.2) nb is determined for 30 GeV ≤ W γp ≤ 180 GeV and Q 2 ≲ 4 GeV 2 . Using the flux of quasi-real photons with Q 2 ≲ 4 GeV 2 , a total production cross section of σ ( γp → J / ψX ) = (56±13±14) nb is derived at an average W γp =90 GeV. The distribution of the squared momentum transfer t from the proton to the J ψ can be fitted using an exponential exp(− b ∥ t ∥) below a ∥ t ∥ of 0.75 GeV 2 yielding a slope parameter of b = (4.7±1.9) GeV −2 .
Published: 1994

29. Prospects for measuring the $B_s^0 - B_s^0$ mixing ratio x s

Author: Ali, A. and London, D.
Subjects: annihilation: electron positron, interaction [p p], annihilation [electron positron], Higgs particle [multiplet], interaction [anti-p p], pair production: bottom meson, pair production [bottom meson], oscillation: time dependence, particle identification: flavor, Z0, bottom [pair production], decay modes [B/s], p p: interaction, dilepton: final state, interaction: p p, B0 anti-B0: mixing, decay modes: B/s, anti-p p: interaction, pair production [bottom], Upsilon(10570), left-right [symmetry], Higgs particle: multiplet, flavor changing [neutral current], anti-p p [interaction], flavor [particle identification], bottom: fragmentation, bottom meson [pair production], electron p: inclusive reaction, octet [fermion], B/s: interference, time dependence [oscillation], bottom: pair production, multiplet: Higgs particle, electron positron: annihilation, symmetry: left-right, bottom meson: pair production, final state [dilepton], interaction: anti-p p, unitarity, ddc:530, interference [B/s], length [oscillation], numerical calculations, fermion: octet, pair production: bottom, B/s [decay modes], electron positron [annihilation], neutral current: flavor changing, CKM matrix matrix, dilepton [final state], bibliography, fragmentation [bottom], final state: dilepton, p p [interaction], oscillation: length, mixing [B0 anti-B0], supersymmetry, multiplet [Higgs particle], inclusive reaction [electron p], B/s: decay modes
Abstract: 78 pp. (1993)., The authors review and update results bearing on the phenomenon of particle-antiparticle mixing in the neutral beauty meson sector. Their main focus is on the mixing ratio xs, defined as xs=( Delta M)/ Gamma , relevant for Bs0-Bs0 mixing. They present theoretical estimates of this quantity in the standard model (SM) and find that xs=O(10), which makes time-dependent oscillation measurements mandatory. They also discuss estimates of xs in a number of extensions of the SM, some of which admit smaller values of xs. Present and future experimental facilities where such measurements can be undertaken are reviewed on a case-to-case basis. These include the high luminosity LEP option, asymmetric threshold B-factories, the ep collider HERA, and hadron colliders, such as the Fermilab Tevatron, LHC and SSC.
Published: 1993

30. Measurement of inclusive jet cross sections in photoproduction at HERA

Author: H Collaboration, Abt, I., Ahmed, T., Andreev, V., Andrieu, B., Appuhn, R.-D., Arpagaus, M., Babaev, A., Bärwolff, H., Bán, J., and H1 Collaboration
Subjects: perturbation theory [quantum chromodynamics], jet: photoproduction, DESY DESY HERA Stor Stor, electron p: inclusive reaction, 296 GeV, photoproduction [jet], electron p [colliding beams], rapidity dependence [cross section], transverse energy [cross section], jet [photoproduction], colliding beams: electron p, electron p: colliding beams, photoproduction: jet, H1, cross section: rapidity dependence, ddc:530, quantum chromodynamics: perturbation theory, inclusive reaction [electron p], cross section: transverse energy, colliding beams [electron p], experimental results
Abstract: 11 pp. (1993)., The inclusive jet cross section in photoproduction has been measured as a function of transverse energy and pseudorapidity using the H 1 detector at the HERA electron-proton collider. The results are compared with leading order QCD calculations
Published: 1993

31. Inclusive particle production at HERA

Author: Borzumati, F. M., Kniehl, B. A., and Kramer, G.
Subjects: perturbation theory [quantum chromodynamics], electron p: inclusive reaction, hadron [electroproduction], structure function [p], hadron: electroproduction, electroproduction [hadron], hard scattering, 298 GeV, spectrum: transverse momentum, photon: structure function, ddc:530, p: structure function, H1 [interpretation of experiments], quantum chromodynamics: perturbation theory, numerical calculations, correction: higher-order, exchange [one-photon], higher-order [correction], electroproduction: hadron, interpretation of experiments: H1, one-photon: exchange, transverse momentum [spectrum], equivalent photon approximation, structure function [photon], rapidity spectrum, transverse momentum: spectrum, one-photon [exchange], spectrum [transverse momentum], inclusive reaction [electron p], exchange: one-photon
Abstract: 11 pp. (1993)., We calculate in next-to-leading order inclusive cross sections of single-particle production via resolved photons inep collisions at HERA. Transverse-momentum and rapidity distributions are presented and the scale dependence is studied. The results are compared with first experimental data from the H1 Collaboration at HERA.
Published: 1993

32. Leptonic QED corrections to the process $ep \to eX$ in Jaquet-Blondel variables

Author: Akhundov, Arif, Bardin, Dima, Kalinovskaya, Lida, and Riemann, Tord
Subjects: electron p: deep inelastic scattering, deep inelastic scattering: electron p, electron p [deep inelastic scattering], correction [quantum electrodynamics], electron p: inclusive reaction, deep inelastic scattering [electron p], ddc:530, inclusive reaction [electron p], numerical calculations, leading logarithm approximation, quantum electrodynamics: correction
Abstract: 9 pp. (1993)., For the study of deep inelastic scattering at HERA, the use of Jaquet-Blondel variables is advantageous in several respects. We calculate the complete leptonic O (α) QED corrections for the reaction ep → eX in these variables. All but one phase space integrations are performed analytically. After exponentiation of soft photon corrections, an accuracy of at least 1% is matched. Numerical results are presented and compared to estimates based on the leading logarithmic approximation.
Published: 1993

33. A search for leptoquarks, leptogluons and excited leptons in H1 at HERA

Author: Abt, I., Ahmed, T., Barrelet, E., Fleischer, M., Flügge, G., Fomenko, A., Fominykh, B., Forbush, M., Formánek, J., Foster, J. M., Franke, G., Fretwurst, E., Fuhrmann, P., Bartel, W., Gabathuler, E., Gamerdinger, K., Garvey, J., Gayler, J., Gellrich, A., Gennis, M., Genzel, H., Gerhards, R., Gillespie, D., Godfrey, L., Bassler, U., Goerlach, U., Goerlich, L., Goldberg, M., Goodall, A. M., Gorelov, I., Goritchev, P., Grab, C., Grässler, H., Grässler, R., Greenshaw, T., Beck, H. P., Greif, H., Grindhammer, G., Gruber, C., Haack, J., Haidt, D., Hajduk, L., Hamon, O., Handschuh, D., Hanlon, E. M., Hapke, M., Behrend, H.-J., Harjes, J., Haydar, R., Haynes, W. J., Heatherington, J., Hedberg, V., Heinzelmann, G., Henderson, R. C. W., Henschel, H., Herma, R., Herynek, I., Belousov, A., Hildesheim, W., Hill, P., Hilton, C. D., Hladký, J., Hoeger, K. C., Huet, Ph., Hufnagel, H., Huot, N., Ibbotson, M., Itterbeck, H., Berger, Ch., Jabiol, M. A., Jacholkowska, A., Jacobsson, C., Jaffre, M., Jansen, T., Jönsson, L., Johannsen, K., Johnson, D. P., Johnson, L., Jung, H., Bergstein, H., Kalmus, P. I. P., Kasarian, S., Kaschowitz, R., Kasselmann, P., Kathage, U., Kaufmann, H. H., Kenyon, I. R., Kermiche, S., Keuker, C., Kiesling, C., Bernardi, G., Klein, M., Kleinwort, C., Knies, G., Ko, W., Köhler, T., Kolanoski, H., Kole, F., Kolya, S. D., Korbel, V., Korn, M., Bernet, R., Kostka, P., Kotelnikov, S. K., Krasny, M. W., Krehbiel, H., Krücker, D., Krüger, U., Kubenka, J. P., Küster, H., Kuhlen, M., Kurča, T., Andreev, V., Bertrand-Coremans, G., Kurzhöfer, J., Kuznik, B., Lander, R., Landon, M. P. J., Lange, W., Langkau, R., Lanius, P., Laporte, J. F., Lebedev, A., Leuschner, A., Besançon, M., Leverenz, C., Levonian, S., Lewin, D., Ley, Ch., Lindner, A., Lindström, G., Lipinski, J., Loch, P., Lohmander, H., Lopez, G. C., Biddulph, P., Lüers, D., Magnussen, N., Malinovski, E., Mani, S., Marage, P., Marks, J., Marshall, R., Martens, J., Martin, R., Martyn, H.-U., Binder, E., Martyniak, J., Masson, S., Mavroidis, A., Maxfield, S. J., McMahon, S. J., Mehta, A., Meier, K., Mercer, D., Merz, T., Meyer, C. A., Bischoff, A., Meyer, H., Meyer, J., Mikocki, S., Milone, V., Monnier, E., Moreau, F., Moreels, J., Morris, J. V., Müller, K., Murín, P., Bizot, J. C., Murray, S. A., Nagovizin, V., Naroska, B., Naumann, Th., Newton, D., Neyret, D., Nguyen, H. K., Niebergall, F., Nisius, R., Nowak, G., Blobel, V., Noyes, G. W., Nyberg, M., Oberlack, H., Obrock, U., Olsson, J. E., Orenstein, S., Ould-Saada, F., Pascaud, C., Patel, G. D., Peppel, E., Borras, K., Peters, S., Pharabod, J. P., Phillips, H. T., Phillips, J. P., Pichler, Ch., Pilgram, W., Pitzl, D., Prosi, R., Rädel, G., Raupach, F., Bosetti, P. C., Rauschnabel, K., Reimer, P., Ribarics, P., Riech, V., Riedlberger, J., Rietz, M., Robertson, S. M., Robmann, P., Roosen, R., Rostovtsev, A., Boudry, V., Royon, C., Rudowicz, M., Ruffer, M., Rusakov, S., Rybicki, K., Sahlmann, N., Sanchez, E., Sankey, D. P. C., Savitsky, M., Schacht, P., Andrieu, B., Bourdarios, C., Schleper, P., von Schlippe, W., Schmidt, C., Schmidt, D., Schmitz, W., Schröder, V., Schulz, M., Schwind, A., Scobel, W., Seehausen, U., Brasse, F., Sell, R., Seman, M., Semenov, A., Shekelyan, V., Sheviakov, I., Shooshtari, H., Siegmon, G., Siewert, U., Sirois, Y., Skillicorn, I. O., Braun, U., Smirnov, P., Smith, J. R., Smolik, L., Soloviev, Y., Spitzer, H., Staroba, P., Steenbock, M., Steffen, P., Steinberg, R., Stella, B., Braunschweig, W., Stephens, K., Stier, J., Stösslein, U., Strachota, J., Straumann, U., Struczinski, W., Sutton, J. P., Taylor, R. E., Thiebaux, C., Thompson, G., Brisson, V., Tichomirov, I., Trenkel, C., Truöl, P., Tchernyshov, V., Turnau, J., Tutas, J., Urban, L., Usik, A., Valkar, S., Valkarova, A., Bruncko, D., Vallee, C., Van Esch, P., Vartapetian, A., Vazdik, Y., Vecko, M., Verrecchia, P., Vick, R., Villet, G., Vogel, E., Wacker, K., Büngener, L., Walker, I. W., Walther, A., Weber, G., Wegener, D., Wegner, A., Wellisch, H. P., Willard, S., Winde, M., Winter, G.-G., Wolff, Th., Bürger, J., Womersley, L. A., Wright, A. E., Wulff, N., Yiou, T. P., Žáček, J., Závada, P., Zeitnitz, C., Ziaeepour, H., Zimmer, M., Zimmermann, W., Büsser, F. W., Zomer, F., H1 Collaboration, Buniatian, A., Appuhn, R.-D., Burke, S., Buschborn, G., Campbell, A. J., Carli, T., Charles, F., Clarke, D., Clegg, A. B., Colombo, M., Coughlan, J. A., Courau, A., Arpagaus, M., Coutures, Ch., Cozzika, G., Criegee, L., Cvach, J., Dagoret, S., Dainton, J. B., Danilov, M., Dann, A. W. E., Dau, W. D., David, M., Babaev, A., Deffur, E., Delcourt, B., Del Buono, L., Devel, M., De Roeck, A., Dingus, P., Dollfus, C., Dowell, J. D., Dreis, H. B., Drescher, A., Bärwolff, H., Duboc, J., Düllmann, D., Dünger, O., Duhm, H., Ebbinghaus, R., Eberle, M., Ebert, J., Ebert, T. R., Eckerlin, G., Efremenko, V., Bán, J., Egli, S., Eichenberger, S., Eichler, R., Eisele, F., Eisenhandler, E., Ellis, N. N., Ellison, R. J., Elsen, E., Erdmann, M., Evrard, E., Baranov, P., Favart, L., Fedotov, A., Feeken, D., Felst, R., Feltesse, J., Fensome, I. F., Ferencei, J., Ferrarotto, F., Flamm, K., and Flauger, W.
Subjects: transverse momentum: missing-energy, electron p: inclusive reaction, coupling: postulated particle, search for [new particle], 296 GeV-cms, excited state [neutrino], +neutrino+anything%22">electron p --> neutrino anything, ddc:530, dependence: mass, leptogluon [postulated particle], colliding beams [electron p], coupling [postulated particle], mass [dependence], DESY DESY HERA Stor Stor, neutrino: excited state, +electron+anything%22">electron p --> electron anything, electron p [colliding beams], e, new particle: search for, postulated particle: leptogluon, mass dependence, postulated particle: coupling, leptoquark [postulated particle], colliding beams: electron p, electron p: colliding beams, missing-energy [transverse momentum], postulated particle: leptoquark, H1, S054CL, postulated particle [coupling], inclusive reaction [electron p], transverse energy, experimental results
Abstract: 14 pp. (1993)., A direct search for new particles in the H1 experiment at HERA is presented for masses ranging from 35 GeV up to ∼ 250 GeV. The data sample of 24 nb−1 accumulated during the first year of operation was analysed for signatures of scalar and vector leptoquarks, leptogluons, excited electrons and excited neutrinos with flavours of the first generation. No evidence for the production of such particles was found in various possible decay channels. Rejection limits are derived.
Published: 1993
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34. Electroproduction of $\rho^0$ Mesons

Author: Cohen, I., Erickson, R., Janata, F., Joos, P., Ladage, A., Nagel, H., Preissner, H., Soding, P., Messing, F., Nordberg, E., Siemann, R., Smith-Kintner, J., Stein, P., Sadoff, A., Drews, G., and Gebert, W.
Subjects: +P+RHO%28770%290+ELECTRON%22">ELECTRON P --> P RHO(770)0 ELECTRON, 1.7-4.0 GEV-CM, INCLUSIVE REACTION [ELECTRON P], INELASTIC SCATTERING: ELECTRON P, (2PI): MASS SPECTRUM, TRANSVERSE MOMENTUM [DIFFERENTIAL CROSS SECTION], Z-DEPENDENCE: DIFFERENTIAL CROSS SECTION, CHANNEL CROSS SECTION: ENERGY DEPENDENCE, +RHO%28765%290+ELECTRON+ANYTHING%22">ELECTRON P --> RHO(765)0 ELECTRON ANYTHING, ELECTROPRODUCTION [RHO(770)0], RHO(770)0: ELECTROPRODUCTION, DIFFERENTIAL CROSS SECTION: TRANSVERSE MOMENTUM, CHANNEL CROSS SECTION: MOMENTUM TRANSFER, PRODUCTION: DIFFRACTION, ELECTRON P [INELASTIC SCATTERING], STREAMER CHAMBER: EXPERIMENTAL RESULTS, (2PI) [MASS SPECTRUM], ddc:530, 1.7-4.0 GEV-CMS, DIFFERENTIAL CROSS SECTION [Z-DEPENDENCE], ELECTRON P: INCLUSIVE REACTION, PRODUCTION [DIFFRACTION], DIFFERENTIAL CROSS SECTION: Z-DEPENDENCE, MODEL: QUARK PARTON, +P+RHO%28770%290+2PI%2B%22">ELECTRON P --> P RHO(770)0 2PI+, TRANSVERSE MOMENTUM: DIFFERENTIAL CROSS SECTION, +RHO%28770%290+ELECTRON+ANYTHING%22">ELECTRON P --> RHO(770)0 ELECTRON ANYTHING, +P+RHO%28765%290+2PI%2B%22">ELECTRON P --> P RHO(765)0 2PI+, QUARK PARTON [MODEL], MASS SPECTRUM: (2PI), CORNELL ES, DIFFRACTION [PRODUCTION], ELECTROPRODUCTION: RHO(770)0, DIFFERENTIAL CROSS SECTION [TRANSVERSE MOMENTUM], EXPERIMENTAL RESULTS [STREAMER CHAMBER], ELECTRON P: INELASTIC SCATTERING, RHO(770)0 [ELECTROPRODUCTION], INELASTIC SCATTERING [ELECTRON P], Z-DEPENDENCE [DIFFERENTIAL CROSS SECTION], DIFFRACTION: PRODUCTION, ENERGY DEPENDENCE [CHANNEL CROSS SECTION], MASS SPECTRUM [(2PI)], MOMENTUM TRANSFER [CHANNEL CROSS SECTION]
Abstract: (1982). doi:10.1103/PhysRevD.25.634, Cross sections for ρ0 electroproduction measured in a streamer-chamber experiment are separated into elastic (ep→epρ0) and inelastic production channels. For the elastic channel, the total cross section and t dependence are presented. For the inelastic channel (1σ)dσdz, (1σ)dσdpT2, and a density matrix element are shown and compared to quark-parton-model predictions. The ratio of ρ0 to direct π0 production is found to be 2.0±0.5±0.3, where the first error is statistical, and the second error is systematic.
Published: 1980
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35. Trimuons from charm

Author: Young, Bing-Lin, Walsh, T. F., and Yang, T. C.
Subjects: DIFFERENTIAL CROSS SECTION: X-DEPENDENCE, PAIR PRODUCTION [CHARMED PARTICLE], 100-10000 GEV, +J%2FPSI%283100%29%28MUON%2B+MUON-%29+MUON%2B+ANYTHING%22">ANTINEUTRINO/MU/ NUCLEON --> J/PSI(3100)(MUON+ MUON-) MUON+ ANYTHING, High Energy Physics::Lattice, MODEL: PARTON, +UPSILON%289500%29%28MUON%2B+MUON-%29+NEUTRINO%2FE%2F+ANYTHING%22">ELECTRON P --> UPSILON(9500)(MUON+ MUON-) NEUTRINO/E/ ANYTHING, NEUTRINO NUCLEON: INCLUSIVE REACTION, RATIO [CHANNEL CROSS SECTION], CHARMED PARTICLE: PAIR PRODUCTION, COLOR [QUARK], NEUTRINO/E/: FINAL STATE, MUON+ [FINAL STATE], UPSILON(9500) [ELECTROPRODUCTION], NEUTRINOPRODUCTION [J/PSI(3100)], FINAL STATE: NEUTRINO/E, CHANNEL CROSS SECTION: RATIO, FINAL STATE: (3MUON), Nuclear Experiment, FINAL STATE [MUON+], FINAL STATE [NEUTRINO/E/], ELECTRON P: INCLUSIVE REACTION, +J%2FPSI%283100%29%28MUON%2B+MUON-%29+NEUTRINO%2FE%2F+ANYTHING%22">ELECTRON P --> J/PSI(3100)(MUON+ MUON-) NEUTRINO/E/ ANYTHING, NEUTRINO/E/ [FINAL STATE], QUANTUM CHROMODYNAMICS, MUON-: FINAL STATE, NEUTRINOPRODUCTION [CHARMED PARTICLE], (3MUON) [FINAL STATE], CHARMED PARTICLE: NEUTRINOPRODUCTION, +J%2FPSI%283100%29%28MUON%2B+MUON-%29+MUON-+ANYTHING%22">NEUTRINO/MU/ NUCLEON --> J/PSI(3100)(MUON+ MUON-) MUON- ANYTHING, CHARMED PARTICLE [PAIR PRODUCTION], MUON+: FINAL STATE, UPSILON(9500): ELECTROPRODUCTION, MUON- [FINAL STATE], X-DEPENDENCE [DIFFERENTIAL CROSS SECTION], ELECTROPRODUCTION: UPSILON(9500), INCLUSIVE REACTION [ELECTRON P], QUARK: COLOR, ddc:530, Y-DEPENDENCE [DIFFERENTIAL CROSS SECTION], INCLUSIVE REACTION [NEUTRINO NUCLEON], FINAL STATE [MUON-], J/PSI(3100): NEUTRINOPRODUCTION, FINAL STATE: MUON, High Energy Physics::Phenomenology, FINAL STATE: MUON+, PAIR PRODUCTION: CHARMED PARTICLE, ELECTROPRODUCTION [UPSILON(9500)], DIFFERENTIAL CROSS SECTION: Y-DEPENDENCE, High Energy Physics::Experiment, PARTON [MODEL]
Abstract: (1978). doi:10.1016/0370-2693(78)90073-4, We have calculated charm pair production in ν μ N collisions using quantum chromodynamics (QCD). The resulting trimuon rate turns out to be small at present energies: σ(3μ) σ(1μ)≲10 −6 at E ν = 200 GeV for α s = 0.2. (However, this process may be measurable at the high energies attainable with colliding beam ep machines.) We emphasize the general importance of looking for inclusive J Ψ or the bound states of heavier flavors in deep inelastic reactions, as a signal for the pair production of heavy quarks.
Published: 1977

36. Quark Fragmentation Functions in Hadronic and Deep Inelastic Single Particle Inclusive Processes

Author: Flume-Gorczyca, B.
Subjects: FINAL STATE: PI, ELECTRON [FINAL STATE], High Energy Physics::Lattice, Nuclear Theory, INCLUSIVE REACTION [PI+ P], ELECTROPRODUCTION [PI], INCLUSIVE REACTION [ELECTRON P], +PI-+ANYTHING%22">PI+ P --> PI- ANYTHING, ELECTROPRODUCTION: PI, PI+ P: INCLUSIVE REACTION, FINAL STATE [PI-], INCLUSIVE REACTION: FRAGMENTATION, PRODUCTION: PI, FRAGMENTATION [BEAM], PI [ELECTROPRODUCTION], PI: PRODUCTION, Nuclear Experiment, PI [PRODUCTION], +PI-+ANYTHING%22">ELECTRON P --> PI- ANYTHING, BEAM: FRAGMENTATION, ELECTRON P: INCLUSIVE REACTION, ELECTRON: FINAL STATE, FINAL STATE [ELECTRON], High Energy Physics::Phenomenology, FRAGMENTATION [INCLUSIVE REACTION], PI: ELECTROPRODUCTION, MODEL: QUARK PARTON, FINAL STATE: ELECTRON, +PI-+ELECTRON+ANYTHING%22">ELECTRON P --> PI- ELECTRON ANYTHING, QUARK PARTON [MODEL], TOTAL CROSS SECTION, PRODUCTION [PI], High Energy Physics::Experiment, PI- [FINAL STATE], INTERPRETATION OF EXPERIMENTS, PI-: FINAL STATE
Abstract: 12 pp. (1974)., In the framework of Feynman's quark--parton model for inclusive electroproduction and quark model of Ezawa, Maharana and Miyazawa for hadronic inclusive processes, relations between invariant cross sections for electroproduction of pions and purely hadronic production of pions in the beam fragmentation regions are derived. They are satisfied by data. The ratio of parton fragmentation functions $\eta=D^{\pi+}_u(z)/D^{\pi+}_d(z)$ is estimated from purely hadronic processes independently from the parton model.
Published: 1974

37. Hadron production by electrons in the deep inelastic region

Author: Cohen, I., Erickson, R., Messing, F., Nordberg, E., Siemann, R., Smith-Kintner, J., Stein, P., Drews, G., Gebert, W., Joos, P., Ladage, A., Nagel, H. J., Soding, P., and Sadoff, A.
Subjects: ELECTROPRODUCTION: LAMBDA, CHARGE: RATIO, ELECTRON [FINAL STATE], FRAGMENTATION [QUARK], (PI+ PI-) [MASS SPECTRUM], HADRON [FINAL STATE], ELECTRON P [DEEP INELASTIC SCATTERING], INCLUSIVE REACTION [ELECTRON P], ELECTROPRODUCTION [K0], EXPERIMENTAL RESULTS: STREAMER CHAMBER, HADRON: ELECTROPRODUCTION, LONGITUDINAL MOMENTUM [SPECTRUM], ELECTROPRODUCTION [HADRON], MASS SPECTRUM: (PI+ PI-), STREAMER CHAMBER: EXPERIMENTAL RESULTS, ELECTRON P: DEEP INELASTIC SCATTERING, LAMBDA [ELECTROPRODUCTION], 0.5-0.6 GEV-SQUARED [UP TO 4.2 GEV-CM], ELECTROPRODUCTION: HADRON, FINAL STATE [HADRON], +HADRON+ELECTRON+ANYTHING%22">ELECTRON P --> HADRON ELECTRON ANYTHING, DEEP INELASTIC SCATTERING: ELECTRON P, K0 [ELECTROPRODUCTION], ELECTROPRODUCTION [LAMBDA], ELECTRON P: INCLUSIVE REACTION, ELECTRON: FINAL STATE, HADRON [ELECTROPRODUCTION], FINAL STATE [ELECTRON], STREAMER CHAMBER [EXPERIMENTAL RESULTS], SPECTRUM: LONGITUDINAL MOMENTUM, FINAL STATE: ELECTRON, DEEP INELASTIC SCATTERING [ELECTRON P], RATIO [CHARGE], HADRON: MULTIPLICITY, ELECTROPRODUCTION: K0, TRANSVERSE MOMENTUM [SPECTRUM], CORNELL ES, MASS SPECTRUM: (P PI-), UP TO 4.2 GEV-CM: 0.5-0.6 GEV-SQUARED, (P PI-) [MASS SPECTRUM], SPECTRUM: TRANSVERSE MOMENTUM, K0: ELECTROPRODUCTION, LAMBDA: ELECTROPRODUCTION, QUARK: FRAGMENTATION, MULTIPLICITY [HADRON], EXPERIMENTAL RESULTS [STREAMER CHAMBER], HADRON: FINAL STATE, FINAL STATE: HADRON
Abstract: 43 pp. (1977).
Published: 1977

38. Charged hadron multiplicities and inclusive $\pi^-$ distributions in inelastic $ep$-Scattering

Author: Chen, C. K., Knowles, J., Martin, D., Scarr, J. M., Skillicorn, I. O., Smith, K., Joos, P., Ladage, A., Meyer, Hendrik, Stein, P., Wolf, G., Yellin, S., Benz, C., Drews, G., Hoffmann, D., Knobloch, J., Kraus, W., Nagel, H., Rabe, E., Sander, C., Schlatter, W.-D., Spitzer, H., and Wacker, K.
Subjects: MULTIPLE PRODUCTION [HADRON], PRODUCTION: PI, INCLUSIVE REACTION [ELECTRON P], EXPERIMENTAL RESULTS: STREAMER CHAMBER, PRODUCTION [PI-], PI-: PRODUCTION, MULTIPLE PRODUCTION: HADRON, TABLES, SPECTRUM [INCLUSIVE REACTION], PHOTOPRODUCTION: HADRON, STREAMER CHAMBER: EXPERIMENTAL RESULTS, HADRON [PHOTOPRODUCTION], ddc:530, ELECTRON P [INTERACTION], INCLUSIVE REACTION [SPECTRUM], INTERACTION: ELECTRON P, PHOTOPRODUCTION [HADRON], CHARGED PARTICLE: MULTIPLICITY, ELECTRON P: INCLUSIVE REACTION, CHANNEL CROSS SECTION, INTERACTION [ELECTRON P], STREAMER CHAMBER [EXPERIMENTAL RESULTS], INCLUSIVE REACTION: SPECTRUM, UP TO 2.8 GEV-CM: 0.3-1.4 GEV-SQUARED, HADRON [MULTIPLE PRODUCTION], MULTIPLICITY [CHARGED PARTICLE], HADRON: MULTIPLE PRODUCTION, SPECTRUM: INCLUSIVE REACTION, PI- [PRODUCTION], DESY ES, 0.3-1.4 GEV-SQUARED [UP TO 2.8 GEV-CM], EXPERIMENTAL RESULTS [STREAMER CHAMBER], MOMENTUM TRANSFER [MULTIPLICITY], ELECTRON P: INTERACTION, MULTIPLICITY: MOMENTUM TRANSFER, HADRON: PHOTOPRODUCTION
Abstract: (1978). doi:10.1016/0550-3213(78)90167-0, Electroproduction of hadrons is studied in the kinematic region W < 2.8 GeV and 0.3 < Q 2 < 1.4 GeV 2 using the DESY streamer chamber. Prong cross sections, charged-particle multiplicities and inclusive π − distributions are presented. The average charged multiplicity is found to be independent of Q 2 in the Q 2 range studied here; however it is lower than in photoproduction. The fraction of forward π − is found to be significantly less in electroproduction than in photoproduction. The 〈 p ⊥ 2 〉 for inclusive π − is, for all x values, similar to that found in photoproduction.
Published: 1977

39. Electroproduction of neutral pions and test of the quark-parton model

Author: Berger, Christoph, Buhring, R., Janata, F., Schmidt, D., Dick, G., Grigull, R., Wagner, W., Ackermann, H., Azemoon, T., Gabriel, W., Mertiens, H. D., and Reich, H. D.
Subjects: ELECTRON [FINAL STATE], PI0 [ELECTROPRODUCTION], High Energy Physics::Lattice, Nuclear Theory, QUARK PARTON [VALIDITY TEST], ELECTROPRODUCTION: PI0, +PI+ELECTRON+ANYTHING%22">ELECTRON P --> PI ELECTRON ANYTHING, ELECTROPRODUCTION: PI, 5: 6: 7 GEV: -0.2-1.3 GEV-SQUARED [4], HADRON: ELECTROPRODUCTION, ELECTROPRODUCTION [PI-], ELECTROPRODUCTION: PI+, ELECTROPRODUCTION [HADRON], PI-: ELECTROPRODUCTION, ELECTROPRODUCTION: HADRON, Nuclear Experiment, PI+: ELECTROPRODUCTION, ELECTRON P: INCLUSIVE REACTION, HADRON [ELECTROPRODUCTION], FINAL STATE [ELECTRON], STRUCTURE FUNCTION, ANNIHILATION: ELECTRON POSITRON, DESY ES, FINAL STATE: ELECTRON, ELECTRON POSITRON [ANNIHILATION], ANNIHILATION [ELECTRON POSITRON], PI+ [ELECTROPRODUCTION], VALIDITY TEST: QUARK PARTON, PI0: ELECTROPRODUCTION, PI [FINAL STATE], PI- [ELECTROPRODUCTION], INCLUSIVE REACTION [ELECTRON P], ELECTROPRODUCTION [PI+], FINAL STATE: PI, ELECTROPRODUCTION [PI0], MAGNETIC SPECTROMETER: EXPERIMENTAL RESULTS, 4: 5: 6: 7 GEV: -0.2-1.3 GEV-SQUARED, ddc:530, MAGNETIC SPECTROMETER [EXPERIMENTAL RESULTS], ELECTRON: FINAL STATE, High Energy Physics::Phenomenology, MODEL: QUARK PARTON, PI: FINAL STATE, QUARK PARTON [MODEL], FINAL STATE [PI], High Energy Physics::Experiment, EXPERIMENTAL RESULTS: MAGNETIC SPECTROMETER, EXPERIMENTAL RESULTS [MAGNETIC SPECTROMETER], ELECTRON POSITRON: ANNIHILATION
Abstract: (1977). doi:10.1016/0370-2693(77)90417-8, We present the first data on the inclusive structure function for π 0 -electroproduction. The data are compared to charged pion electroproduction and charged pion production from electron-positron annihilation taking the quark-parton model as a guide.
Published: 1977
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40. Hadron production by virtual photons in the quark fragmentation region

Author: Scarr, J. M., Chen, C. K., Drews, G., Knobloch, J., Nagel, H., Rabe, E., Schlatter, W.-D., Spitzer, H., Wacker, K., Knowles, J., Martin, D., Skillicorn, I. O., Smith, K., Joos, P., Ladage, A., Meyer, Hendrik, and Wolf, G.
Subjects: FRAGMENTATION [QUARK], CHARGE: RATIO, RADIATIVE CORRECTION, HADRON [FINAL STATE], Nuclear Theory, INCLUSIVE REACTION [ELECTRON P], CHANNEL CROSS SECTION: ENERGY DEPENDENCE, +HADRON+ANYTHING%22">ELECTRON P --> HADRON ANYTHING, EXPERIMENTAL RESULTS: STREAMER CHAMBER, HADRON: ELECTROPRODUCTION, ELECTROPRODUCTION [HADRON], CHANNEL CROSS SECTION: MOMENTUM TRANSFER, STREAMER CHAMBER: EXPERIMENTAL RESULTS, ddc:530, ELECTROPRODUCTION: HADRON, Nuclear Experiment, FINAL STATE [HADRON], ELECTRON P: INCLUSIVE REACTION, HADRON [ELECTROPRODUCTION], STREAMER CHAMBER [EXPERIMENTAL RESULTS], High Energy Physics::Phenomenology, MODEL: QUARK PARTON, DESY ES, QUARK PARTON [MODEL], 0.3-1.4 GEV-SQUARED [1.8-2.8 GEV-CM], HADRON: CHARGED PARTICLE, CHARGED PARTICLE [HADRON], RATIO [CHARGE], 1.8-2.8 GEV-CM: 0.3-1.4 GEV-SQUARED, High Energy Physics::Experiment, EXPERIMENTAL RESULTS [STREAMER CHAMBER], QUARK: FRAGMENTATION, HADRON: FINAL STATE, FINAL STATE: HADRON, ENERGY DEPENDENCE [CHANNEL CROSS SECTION], MOMENTUM TRANSFER [CHANNEL CROSS SECTION]
Abstract: (1978). doi:10.1016/0550-3213(78)90128-1, We have measured the inclusive electroproduction of positive and negative hadrons in the quark fragmentation region using the streamer chamber at DESY. Data are presented in terms of the variable z p = p / v in the kinematic region 1.8 < W < 2.8 GeV and 0.3 < Q 2 < 1.4 GeV 2 . The positive hadron distributions contain a strong proton component. After subtraction of the proton component and elastic rho events, the distribution (1/ σ tot ) d σ /d z p for positive and negative hadrons agrees well with the corresponding distribution from e + e − annihilation (DORIS data). This behaviour supports the validity of the quark-parton model at surprisingly low Q 2 and W .
Published: 1977
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41. Inclusive $K^0_S$ and $\Lambda$ Electroproduction

Author: Cohen, I., Erickson, R., Messing, F., Nordberg, E., Siemann, R., Smith-Kintner, J., Stein, P., Drews, G., Gebert, W., Joos, P., Ladage, A., Nagel, H., Soding, P., and Sadoff, A.
Subjects: ELECTRON P: INCLUSIVE REACTION, ELECTROPRODUCTION: LAMBDA, ELECTRON: FINAL STATE, K0(S): ELECTROPRODUCTION, FINAL STATE: LAMBDA, SPECTRUM: LONGITUDINAL MOMENTUM, FINAL STATE: ELECTRON, LAMBDA: FINAL STATE, EXPERIMENTAL RESULTS: STREAMER CHAMBER, +LAMBDA+ELECTRON+ANYTHING%22">ELECTRON P --> LAMBDA ELECTRON ANYTHING, STREAMER CHAMBER: EXPERIMENTAL RESULTS, CORNELL ES, LAMBDA: ELECTROPRODUCTION, SPECTRUM: TRANSVERSE MOMENTUM, ELECTROPRODUCTION: K0(S), QUARK: FRAGMENTATION, +K0%28S%29+ELECTRON+ANYTHING%22">ELECTRON P --> K0(S) ELECTRON ANYTHING, 11.5 GEV
Abstract: Physical review letters 40(25), 1614 - 1617 (1978). doi:10.1103/PhysRevLett.40.1614, Cross sections for inclusive electroproduction of Ks0's and Λ's have been measured. The Ks0 results are combined with data from electron-positron annihilation and charged K electroproduction to give information on quark fragmentation into strange particles. The longitudinal- and transverse-momentum distributions for Λ's are compared with those of electroproduced protons., Published by APS, College Park, Md.
Published: 1978
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42. The Structure function F2 (x, Q2) at low Q2 from radiative events with H1 at HERA

Author: Favart, L., Zhiqing Zhang, Fleischer, M., and Hutte, M.
Subjects: electron p: inclusive reaction, (photon): energy spectrum, structure function [p], radiative correction [quantum electrodynamics], +electron+photon+anything%22">electron p --> electron photon anything, photon [bremsstrahlung], momentum transfer: low, energy spectrum: (photon), positron p [colliding beams], p: structure function, colliding beams [electron p], energy spectrum [(photon)], parametrization, electron p [colliding beams], photon: bremsstrahlung, bremsstrahlung [photon], positron p: colliding beams, colliding beams [positron p], colliding beams: electron p, DESY HERA Stor, electron p: colliding beams, bremsstrahlung: photon, colliding beams: positron p, 300 GeV-cms, quantum electrodynamics: radiative correction, H1, (photon) [energy spectrum], inclusive reaction [electron p], low [momentum transfer], Particle Physics - Experiment, experimental results
Abstract: 34 pp. (1996).

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