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1. Spin density matrix elements in exclusive $\omega$ electroproduction on $\mathrm{^1 H}$ and $\mathrm{^2 H}$ targets at 27.5 GeV beam energy

Author

Airapetian, Avetik, Akopov, N., Cisbani, E., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Deconinck, W., De Leo, R., De Sanctis, E., Diefenthaler, M., Di Nezza, P., Düren, M., Akopov, Zaven, Ehrenfried, M., Elbakian, G., Ellinghaus, F., Etzelmüller, E., Fabbri, R., Felawka, L., Frullani, S., Gabbert, D., Gapienko, G., Gapienko, V., Augustyniak, W., Garibaldi, F., Gavrilov, G., Gharibyan, V., Hartig, M., Hasch, D., Holler, Y., Hristova, I., Ivanilov, A., Jackson, H. E., Joosten, S., Avetissian, A., Kaiser, R., Karyan, G., Keri, T., Kinney, E., Kisselev, A., Korotkov, V., Kozlov, V., Kravchenko, P., Krivokhijine, V. G., Lagamba, L., Blok, H. P., Lapikás, L., Lehmann, I., Lenisa, P., Lorenzon, W., Ma, B. -Q., Mahon, D., Manaenkov, S. I., Mao, Y., Marianski, B., Marukyan, H., Borissov, A., Movsisyan, A., Murray, M., Naryshkin, Y., Nass, A., Nowak, W. -D., Pappalardo, L. L., Perez-Benito, R., Petrosyan, Anush, Reimer, P. E., Reolon, A. R., Bryzgalov, V., Riedl, C., Rith, K., Rostomyan, A., Ryckbosch, D., Schäfer, A., Schnell, Gunar, Schüler, K. P., Seitz, B., Shibata, T. -A., Stahl, M., Capiluppi, M., Stancari, M., Statera, M., Steffens, E., Steijger, J. J. M., Taroian, S., Terkulov, A., Truty, R., Trzcinski, A., Tytgat, M., Van Haarlem, Y., Capitani, G. P., Van Hulse, C., Vikhrov, V., Vilardi, I., Wang, S., Yaschenko, S., Yen, S., Zeiler, D., Zihlmann, B., Zupranski, P., and HERMES Collaboration

Subjects
perturbation theory [quantum chromodynamics], 27.6 GeV, amplitude analysis [helicity], High Energy Physics::Phenomenology, electroproduction [omega(783)], pole [pi], density matrix [spin], HERMES, exclusive reaction [positron p], exclusive reaction [electron p], transverse [cross section], DESY HERA Stor, exclusive reaction [electron deuteron], High Energy Physics::Experiment, ddc:530, angular distribution, ratio [cross section], Nuclear Experiment, longitudinal [cross section], longitudinal [polarized beam], experimental results
Abstract

Exclusive electroproduction of $\omega $ mesons on unpolarized hydrogen and deuterium targets is studied in the kinematic region of $Q^2> 1.0$ GeV$^2$ , 3.0 GeV $< W

Published
2014

2. DVCS at HERMES

Author

Murray, Morgan and HERMES Collaboration

Subjects
HERMES experiment, Physics, Nuclear and High Energy Physics, Particle physics, 27.6 GeV, Compton scattering, transverse [polarized target], FOS: Physical sciences, HERMES, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology, DESY HERA Stor, High Energy Physics - Phenomenology (hep-ph), deeply virtual Compton scattering, deep inelastic scattering [electron p], High Energy Physics::Experiment, ddc:530, deep inelastic scattering [positron p], asymmetry [charge], asymmetry [spin], experimental results
Abstract

This talk explores the impact that the Hermes experiment has had regarding knowledge of the Deeply Virtual Compton Scattering process. We discuss the various measurements that Hermes has contributed to the library of DVCS knowledge, with focus in particular on the recent high-precision beam spin and charge asymmetries., Conference Proceedings for SPIN 2012

Published
2014

3. Pentaquark $\Theta^+$ search at HERMES

Author

The HERMES Collaboration, Akopov, N., Akopov, Z., Augustyniak, W., Avakian, R., Avetissian, A., Avetisyan, E., Belostotski, S., Blok, H. P., Borissov, A., Bowles, J., Bryzgalov, V., Burns, J., Capitani, G. P., Cisbani, E., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Deconinck, W., De Leo, R., De Sanctis, E., Di Nezza, P., Elbakian, G., Etzelmüller, E., Fabbri, R., Fantoni, A., Felawka, L., Frullani, S., Gabbert, D., García, J. Garay, Garibaldi, F., Gavrilov, G., Giordano, F., Gliske, S., Hartig, M., Hasch, D., Holler, Y., Hristova, I., Imazu, Y., Ivanilov, A., Jackson, H. E., Joosten, S., Kaiser, R., Karyan, G., Keri, T., Kinney, E., Kisselev, A., Kozlov, V., Kravchenko, P., Krivokhijine, V. G., Lagamba, L., Lapikás, L., Lehmann, I., Ruiz, A. López, Lorenzon, W., Lu, X., Ma, B. -Q., Mahon, D., Manaenkov, S. I., Mao, Y., Marianski, B., de la Ossa, A. Martinez, Marukyan, H., Miller, C. A., Miyachi, Y., Movsisyan, A., Murray, M., Nappi, E., Nass, A., Negodaev, M., Nowak, W. -D., Pappalardo, L. L., Perez-Benito, R., Petrosyan, A., Reimer, P. E., Reolon, A. R., Riedl, C., Rith, K., Rosner, G., Rostomyan, A., Rubin, J., Ryckbosch, D., Salomatin, Y., Schnell, G., Schüler, K. P., Seitz, B., Shibata, T. -A., Stancari, M., Steijger, J. J. M., Taroian, S., Terkulov, A., Truty, R., Trzcinski, A., Tytgat, M., Van Haarlem, Y., Van Hulse, C., Veretennikov, D., Vikhrov, V., Vilardi, I., Wang, S., Yaschenko, S., Ye, H., Ye, Z., Yen, S., Zihlmann, B., and Zupranski, P.

Subjects
polarized target [deuterium], HERMES, photoproduction [hadron], High Energy Physics - Experiment, target [deuterium], ddc:530, Nuclear Experiment, pentaquark, hadronic decay [Theta(1540)], 27.6 GeV, background, polarized target [hydrogen], +p+K0%28S%29%22">Theta(1540) --> p K0(S), +pi%2B+pi%22">K0(S) --> pi+ pi, baryon, DESY HERA Stor, (p K0(S)) [mass spectrum], search for [pentaquark], hydrogen, deep inelastic scattering [electron p], High Energy Physics::Experiment, deep inelastic scattering [electron deuteron], particle identification, statistical, experimental results, photoproduction
Abstract

The earlier search at HERMES for narrow baryon states excited in quasi-real photoproduction, decaying through the channel $pK_S^0\rightarrow p\pi^+\pi^-$, has been extended with improved decay-particle reconstruction, more advanced particle identification, and increased event samples. The structure observed earlier at an invariant mass of 1528 MeV shifts to 1522 MeV and the statistical significance drops to about 2$\sigma$ for data taken with a deuterium target. The number of events above background is $68_{-31}^{+98}\text{(stat)}\pm13\text{(sys)}$. No such structure is observed in the hydrogen data set.

Published
2014

4. Spin density matrix elements in exclusive $\omega$ electroproduction on $\mathrm{^1 H}$ and $\mathrm{^2 H}$ targets at 27.5 GeV beam energy

Author

Airapetian, Avetik, Akopov, N., Akopov, Zaven, Augustyniak, W., Avetissian, A., Blok, H. P., Borissov, A., Bryzgalov, V., Capiluppi, M., Capitani, G. P., Cisbani, E., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Deconinck, W., De Leo, R., De Sanctis, E., Diefenthaler, M., Di Nezza, P., Düren, M., Ehrenfried, M., Elbakian, G., Ellinghaus, F., Etzelmüller, E., Fabbri, R., Felawka, L., Frullani, S., Gabbert, D., Gapienko, G., Gapienko, V., Garibaldi, F., Gavrilov, G., Gharibyan, V., Hartig, M., Hasch, D., Holler, Y., Hristova, I., Ivanilov, A., Jackson, H. E., Joosten, S., Kaiser, R., Karyan, G., Keri, T., Kinney, E., Kisselev, A., Korotkov, V., Kozlov, V., Kravchenko, P., Krivokhijine, V. G., Lagamba, L., Lapikás, L., Lehmann, I., Lenisa, P., Lorenzon, W., Ma, B. -Q., Mahon, D., Manaenkov, S. I., Mao, Y., Marianski, B., Marukyan, H., Movsisyan, A., Murray, M., Naryshkin, Y., Nass, A., Nowak, W. -D., Pappalardo, L. L., Perez-Benito, R., Petrosyan, Anush, Reimer, P. E., Reolon, A. R., Riedl, C., Rith, K., Rostomyan, A., Ryckbosch, D., Schäfer, A., Schnell, Gunar, Schüler, K. P., Seitz, B., Shibata, T. -A., Stahl, M., Stancari, M., Statera, M., Steffens, E., Steijger, J. J. M., Taroian, S., Terkulov, A., Truty, R., Trzcinski, A., Tytgat, M., Van Haarlem, Y., Van Hulse, C., Vikhrov, V., Vilardi, I., Wang, S., Yaschenko, S., Yen, S., Zeiler, D., Zihlmann, B., and Zupranski, P.

Subjects
27.6 GeV, electron deuteron: exclusive reaction, cross section: longitudinal, cross section: ratio, HERMES, omega(783): electroproduction, cross section: transverse, DESY HERA Stor, pi: pole, positron p: exclusive reaction, electron p: exclusive reaction, polarized beam: longitudinal, angular distribution, spin: density matrix, quantum chromodynamics: perturbation theory, helicity: amplitude analysis, experimental results
Abstract

The European physical journal / C 74(11), 3110 (2014). doi:10.1140/epjc/s10052-014-3110-1, Exclusive electroproduction of $\omega $ mesons on unpolarized hydrogen and deuterium targets is studied in the kinematic region of $Q^2> 1.0$ GeV$^2$ , 3.0 GeV $< W, Published by Springer, Berlin

Published
2014
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5. Spin density matrix elements in exclusive $\omega$ electroproduction on $\mathrm{^1 H}$ and $\mathrm{^2 H}$ targets at 27.5 GeV beam energy

Author

Airapetian, Avetik, Akopov, N., Cisbani, E., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Deconinck, W., De Leo, R., De Sanctis, E., Diefenthaler, M., Di Nezza, P., Düren, M., Akopov, Z., Ehrenfried, M., Elbakian, G., Ellinghaus, F., Etzelmüller, E., Fabbri, R., Felawka, L., Frullani, S., Gabbert, D., Gapienko, G., Gapienko, V., Augustyniak, W., Garibaldi, F., Gavrilov, G., Gharibyan, V., Hartig, M., Hasch, D., Holler, Y., Hristova, I., Ivanilov, A., Jackson, H. E., Joosten, S., Avetissian, A., Kaiser, R., Karyan, G., Keri, T., Kinney, E., Kisselev, A., Korotkov, V., Kozlov, V., Kravchenko, P., Krivokhijine, V. G., Lagamba, L., Blok, H. P., Lapikás, L., Lehmann, I., Lenisa, P., Lorenzon, W., Ma, B. -Q., Mahon, D., Manaenkov, S. I., Mao, Y., Marianski, B., Marukyan, H., Borissov, A., Movsisyan, A., Murray, M., Naryshkin, Y., Nass, A., Nowak, W. -D., Pappalardo, L. L., Perez-Benito, R., Petrosyan, Anush, Reimer, P. E., Reolon, A. R., Bryzgalov, V., Riedl, C., Rith, K., Rostomyan, A., Ryckbosch, D., Schäfer, A., Schnell, Gunar, Schüler, K. P., Seitz, B., Shibata, T. -A., Stahl, M., Capiluppi, M., Stancari, M., Statera, M., Steffens, E., Steijger, J. J. M., Taroian, S., Terkulov, A., Truty, R., Trzcinski, A., Tytgat, M., Van Haarlem, Y., Capitani, G. P., Van Hulse, C., Vikhrov, V., Vilardi, I., Wang, S., Yaschenko, S., Yen, S., Zeiler, D., Zihlmann, B., Zupranski, P., and HERMES Collaboration

Subjects
perturbation theory [quantum chromodynamics], 27.6 GeV, amplitude analysis [helicity], High Energy Physics::Phenomenology, electroproduction [omega(783)], pole [pi], density matrix [spin], HERMES, exclusive reaction [positron p], exclusive reaction [electron p], transverse [cross section], DESY HERA Stor, exclusive reaction [electron deuteron], High Energy Physics::Experiment, ddc:530, angular distribution, ratio [cross section], Nuclear Experiment, longitudinal [cross section], longitudinal [polarized beam], experimental results
Abstract

Exclusive electroproduction of $\omega $ mesons on unpolarized hydrogen and deuterium targets is studied in the kinematic region of $Q^2> 1.0$ GeV$^2$ , 3.0 GeV $< W

Published
2014

6. Azimuthal distributions of charged hadrons, pions, and kaons produced in deep-inelastic scattering off unpolarized protons and deuterons

Author

A. Trzcinski, J. Burns, N. C. R. Makins, S. Frullani, A. Hillenbrand, Y. Imazu, K. Rith, Dirk Ryckbosch, Adel Terkulov, V. A. Gapienko, A. Ivanilov, Y. Holler, S. Yen, G. Gapienko, J. Bowles, J. G. Rubin, David Mahon, M. Golembiovskaya, Ralf Kaiser, F. Sanftl, I. Lehmann, Michael Tytgat, E. Cisbani, Andreas Schäfer, A. Movsisyan, C. A. Miller, W. Yu, F. Giordano, Wouter Deconinck, V. Zagrebelnyy, B. Marianski, B. Zihlmann, G. Ciullo, W. Augustyniak, G. Gavrilov, Alexander Borissov, H. E. Jackson, C. Van Hulse, V. G. Krivokhijine, H. P. Blok, T. A. Shibata, M. Statera, R.O. Avakian, A. Airapetian, M. Capiluppi, Arne Vandenbroucke, M. Stancari, Alessandra Fantoni, Y. Naryshkin, W.-D. Nowak, Shan Wang, Wolfgang Lorenzon, D. Zeiler, E. De Sanctis, Franco Garibaldi, P. F. Dalpiaz, L. Manfré, P. E. Reimer, M. Hoek, Ivana Hristova, A. Martinez de la Ossa, A. López Ruiz, D. Veretennikov, Paolo Lenisa, S. Yaschenko, S. Joosten, M. Negodaev, I. Vilardi, V. A. Korotkov, Eugenio Nappi, A. Kisselev, V. Kozlov, Luciano Pappalardo, Y. Van Haarlem, A. Rostomyan, A. R. Reolon, A. Avetissian, Y. J. Mao, P. Kravchenko, L. Lapikás, T. Keri, M. Diefenthaler, A. Nass, H. S. Jo, F. Stinzing, J. Stewart, G. Schnell, M. Contalbrigo, E. Avetisyan, G. Elbakian, S. I. Manaenkov, Martin Raithel, E. C. Aschenauer, R. Perez-Benito, V. Vikhrov, M. Hartig, A. Petrosyan, P. Di Nezza, C. Riedl, Morgan Murray, B. Seitz, D. Hasch, K. P. Schüler, P. Zupranski, G. Rosner, R. Truty, N. Akopov, S. Belostotski, G. Karyan, V. Bryzgalov, Frank Ellinghaus, E. R. Kinney, Y. Salomatin, B. Q. Ma, H. Marukyan, R. De Leo, Stephen V. Gliske, L. Felawka, L. Lagamba, Z. Akopov, L. De Nardo, Zhenyu Ye, V. Gharibyan, J. J. M. Steijger, Michael Düren, Cynthia Marie Hadjidakis, and Y. Miyachi

Subjects
Drell-Yan process, HERMES experiment, generalized parton distribution, Nuclear Theory, Hadron, HERMES, Parton, 01 natural sciences, multiple production [charged particle], High Energy Physics - Experiment, HARD-SCATTERING, High Energy Physics - Experiment (hep-ex), semi-inclusive reaction [deep inelastic scattering], transverse momentum [parton], HERMES EXPERIMENT, deep inelastic scattering [positron p], Collins, Nuclear Experiment (nucl-ex), Nuclear Experiment, electroproduction [pi], Physics, FINAL-STATE INTERACTIONS, ANGULAR-DISTRIBUTIONS, PARTON-MODEL, DUAL RADIATOR RICH, angular dependence, modulation, DESY HERA Stor, SPIN PRODUCTION ASYMMETRIES, Nucleon, Quark, Nuclear and High Energy Physics, Particle physics, DRELL-YAN, FOS: Physical sciences, Nuclear physics, angular distribution [charged particle], Pion, 0103 physical sciences, ddc:530, PHYSICS EVENT GENERATION, TRANSVERSE-MOMENTUM, 010306 general physics, deep inelastic scattering [lepton deuteron], 27.6 GeV, 010308 nuclear & particles physics, Scattering, High Energy Physics::Phenomenology, polarization [quark], Deep inelastic scattering, Physics and Astronomy, electroproduction [K], deep inelastic scattering [electron p], High Energy Physics::Experiment, experimental results
Abstract

The azimuthal cos{\phi} and cos2{\phi} modulations of the distribution of hadrons produced in unpolarized semi-inclusive deep-inelastic scattering of electrons and positrons off hydrogen and deuterium targets have been measured in the HERMES experiment. For the first time these modulations were determined in a four-dimensional kinematic space for positively and negatively charged pions and kaons separately, as well as for unidentified hadrons. These azimuthal dependences are sensitive to the transverse motion and polarization of the quarks within the nucleon via, e.g., the Cahn, Boer-Mulders and Collins effects.

Published
2013

7. Beam-helicity asymmetry in associated electroproduction of real photons $ep \to e\gamma \pi N$ in the $\Delta$-resonance region

Author

The HERMES Collaboration, Airapetian, A., Akopov, N., Aschenauer, E. C., Augustyniak, W., Avakian, R., Avetissian, A., Avetisyan, E., Blok, H. P., Böttcher, H., Borissov, A., Bowles, J., Brodski, I., Bryzgalov, V., Burns, J., Capitani, G. P., Cisbani, E., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Deconinck, W., De Leo, R., De Sanctis, E., Diefenthaler, M., Di Nezza, P., Düren, M., Ehrenfried, M., Elbakian, G., Ellinghaus, F., Etzelmüller, E., Fabbri, R., Frullani, S., Gapienko, G., Gapienko, V., García, J. Garay, Garibaldi, F., Gavrilov, G., Gharibyan, V., Giordano, F., Gliske, S., Hartig, M., Hasch, D., Holler, Y., Hristova, I., Ivanilov, A., Jackson, H. E., Joosten, S., Kaiser, R., Karyan, G., Keri, T., Kinney, E., Kisselev, A., Korotkov, V., Kozlov, V., Kravchenko, P., Krivokhijine, V. G., Lagamba, L., Lapikás, L., Lehmann, I., Lenisa, P., Lorenzon, W., Lu, X. -G., Ma, B. -Q., Mahon, D., Makins, N. C. R., Manaenkov, S. I., Mao, Y., Marianski, B., Marukyan, H., Miller, C. A., Miyachi, Y., Movsisyan, A., Muccifora, V., Murray, M., Mussgiller, A., Naryshkin, Y., Nass, A., Negodaev, M., Nowak, W. -D., Pappalardo, L. L., Perez-Benito, R., Petrosyan, A., Reimer, P. E., Reolon, A. R., Riedl, C., Rith, K., Rosner, G., Rostomyan, A., Rubin, J., Ryckbosch, D., Salomatin, Y., Schäfer, A., Schnell, G., Seitz, B., Shibata, T. -A., Stahl, M., Statera, M., Steffens, E., Steijger, J. J. M., Stewart, J., Stinzing, F., Taroian, S., Terkulov, A., Truty, R., Trzcinski, A., Tytgat, M., Van Haarlem, Y., Van Hulse, C., Vikhrov, V., Vilardi, I., Wang, S., Yaschenko, S., Ye, Z., Yen, S., Zagrebelnyy, V., Zihlmann, B., and Zupranski, P.

Subjects
internal [target], 27.6 GeV, +nucleon+pi+electron+photon%22">positron p --> nucleon pi electron photon, scattering amplitude, HERMES, asymmetry [helicity], Delta(1232), High Energy Physics - Experiment, DESY HERA Stor, associated production [photon], interaction [positron p], Physics::Accelerator Physics, ddc:530, High Energy Physics::Experiment, Nuclear Experiment, longitudinal [polarized beam], electroproduction [pi], recoil [detector], experimental results
Abstract

The beam-helicity asymmetry in associated electroproduction of real photons, $ep\to e\gamma \pi N$, in the $\Delta$(1232)-resonance region is measured using the longitudinally polarized HERA positron beam and an unpolarized hydrogen target. Azimuthal Fourier amplitudes of this asymmetry are extracted separately for two channels, $ep\to e\gamma \pi^0 p$ and $ep\to e\gamma \pi^+ n$, from a data set collected with a recoil detector. All asymmetry amplitudes are found to be consistent with zero., Comment: 17 pages, 4 figures, (minor changes wit respect to previous arXiv version)

Published
2013

8. Longitudinal semi-inclusive double-spin asymmetries at HERMES

Author

Kravchenko, Polina and HERMES Collaboration

Subjects
longitudinal [polarized target], 27.6 GeV, Physics, High Energy Physics::Phenomenology, HERMES, polarized beam, semi-inclusive reaction [electron p], transverse momentum dependence, x-dependence, electroproduction [hadron], DESY HERA Stor, semi-inclusive reaction [electron deuteron], High Energy Physics::Experiment, asymmetry [charge], Nuclear Experiment, asymmetry [spin], experimental results
Abstract

AFinal results are reported on the semi-inclusive double-spin asymmetries $A_{LL}$ for charged hadrons and identified charged pions and kaons measured at HERMES longitudinally polarized hydrogen and deuterium targets and the longitudinally polarized 27.6 GeV HERA lepton beam. The kinematic dependences of the azimuthal $cos{\phi}$ moments of $A_{LL}$ simultaneously on Bjorken-x, the hadron energy fraction z and hadron transverse momentum $p_{h\perp}$ are explored. The x, $z$ and $p_{h\perp}$ dependencies of $A_{LL}^{cos{\phi}}$ asymmetry were found to be small, no dependence on the kinematic variables was observed., Proc. of DIS 2012, 943 - 946; DESY-PROC-2012-02; ISSN 1435-8077

Published
2012

9. Multiplicities of charged pions and kaons from semi-inclusive deep-inelastic scattering by the proton and the deuteron

Author

N. Akopov, G. Karyan, V. A. Korotkov, Y. J. Mao, A. Trzcinski, Wouter Deconinck, Frank Ellinghaus, E. R. Kinney, A. Petrosyan, W.-D. Nowak, Andreas Mussgiller, David Mahon, J. Burns, Vitaly Shutov, H. P. Blok, G. Elbakian, L. Manfré, A. Martinez de la Ossa, P. E. Reimer, Wolfgang Lorenzon, Andreas Schäfer, C. A. Miller, Ivana Hristova, Eugenio Nappi, L. De Nardo, Alessandra Fantoni, S. Yaschenko, S. I. Manaenkov, A. Hillenbrand, Y. Imazu, L. Lagamba, M. Diefenthaler, I. Vilardi, S. Belostotski, M. Hoek, Shan Wang, B. Zihlmann, P. F. Dalpiaz, Z. Akopov, Nagao Kobayashi, Zhenyu Ye, V. Zagrebelnyy, V. Bryzgalov, F. Garibaldi, H. S. Jo, W. Augustyniak, Riccardo Fabbri, C. Van Hulse, Alexander Borissov, A. López Ruiz, D. Gabbert, M. Statera, K. Rith, V. Gharibyan, Y. Naryshkin, M. Stancari, Y. Van Haarlem, M. Capiluppi, J. Bowles, I. Brodski, D. Zeiler, C. Vogel, Y. Salomatin, A. Nass, M. Golembiovskaya, A. Rostomyan, A. R. Reolon, A. Avetissian, H. E. Jackson, Stephen V. Gliske, T. Keri, M. Contalbrigo, D. Veretennikov, V. G. Krivokhijine, B. Q. Ma, Martin Raithel, G. Gapienko, J. J. M. Steijger, E. C. Aschenauer, H. Marukyan, R. De Leo, L. Felawka, B. Marianski, Michael Düren, E. De Sanctis, C. Riedl, W. Yu, G. P. Capitani, Michael Tytgat, Adel Terkulov, M. Ehrenfried, Cynthia Marie Hadjidakis, Y. Miyachi, Paolo Lenisa, E. Cisbani, S. Joosten, T. A. Shibata, A. Kisselev, V. Kozlov, V. Gapienko, R.O. Avakian, Morgan Murray, S. Taroian, S. Yen, Luciano Pappalardo, B. Seitz, Andrey V. Izotov, Ralf Kaiser, E. Avetisyan, N. C. R. Makins, E. Steffens, G. Gavrilov, S. Frullani, Dirk Ryckbosch, R. Perez-Benito, B. Maiheu, F. Giordano, G. Ciullo, J. G. Rubin, I. Lehmann, M. Hartig, P. Di Nezza, D. Hasch, M. Negodaev, A. Airapetian, F. Stinzing, G. Schnell, A. Ivanilov, L. Lapikás, P. Kravchenko, J. Stewart, Y. Holler, P. Zupranski, G. Rosner, R. Truty, F. Sanftl, and A. Movsisyan

Subjects
HERMES experiment, AZIMUTHAL DEPENDENCE, FRAGMENTATION FUNCTIONS, Hadron, Parton, HERMES, momentum transfer dependence, 01 natural sciences, 7. Clean energy, CROSS-SECTIONS, High Energy Physics - Experiment, 13.60.-r, 13.60.Le, 13.87.Fh, 14.20.Dh, High Energy Physics - Experiment (hep-ex), semi-inclusive reaction [deep inelastic scattering], LEPTOPRODUCTION, MONTE-CARLO, deep inelastic scattering [positron p], Nuclear Experiment (nucl-ex), Nuclear Experiment, electroproduction [pi], Physics, HERA, fragmentation [quark], DESY HERA Stor, CHAMBERS, FACTORIZATION, Quark, Nuclear and High Energy Physics, Particle physics, Meson, PARTON MODEL, FOS: Physical sciences, x-dependence, Nuclear physics, Pion, 0103 physical sciences, ddc:530, 010306 general physics, deep inelastic scattering [lepton deuteron], 010308 nuclear & particles physics, 27.6 GeV, High Energy Physics::Phenomenology, ELECTROPRODUCTION, Deep inelastic scattering, multiplicity: measured [charged particle], Physics and Astronomy, electroproduction [K], deep inelastic scattering [electron p], High Energy Physics::Experiment, experimental results
Abstract

Multiplicities in semi-inclusive deep-inelastic scattering are presented for each charge state of ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$ and ${\mathrm{K}}^{\ifmmode\pm\else\textpm\fi{}}$ mesons. The data were collected by the HERMES experiment at the HERA storage ring using 27.6 GeV electron and positron beams incident on a hydrogen or deuterium gas target. The results are presented as a function of the kinematic quantities ${x}_{\mathrm{B}}$, ${Q}^{2}$, $z$, and ${P}_{h\ensuremath{\perp}}$. They represent a unique data set for identified hadrons that will significantly enhance our understanding of the fragmentation of quarks into final-state hadrons in deep-inelastic scattering.

Published
2012

10. Multidimensional study of the hadron attenuation at HERMES

Author

Karyan, Gevorg and HERMES Collaboration

Subjects
deuteron, 27.6 GeV, dependence [mass number], semi-inclusive reaction [electron nucleus], HERMES, attenuation [hadron], ratio [multiplicity], momentum transfer dependence, transverse momentum dependence, xenon, energy dependence, hadroproduction [K], DESY HERA Stor, hadroproduction [p], neon, deep inelastic scattering [electron nucleus], hadroproduction [anti-p], krypton, experimental results
Published
2012

11. Hard exclusive $\phi$ meson leptoproduction at HERMES

Author

Golembiovskaya, Mayya, Rostomyan, Armine, Yaschenko, Sergey, and Veretennikov, Denis

Subjects
DESY HERA Stor, 27.6 GeV, Physics, amplitude analysis [helicity], High Energy Physics::Phenomenology, exclusive reaction [electron nucleon], electroproduction [Phi(1020)], polarized target, High Energy Physics::Experiment, HERMES, polarized beam, density matrix [spin], experimental results
Abstract

AThe HERMES experiment at DESY, Hamburg collected a set of data on hard exclusive vector meson ($\rho^{0}$, $\phi$ , $\omega$) leptoproduction using the 27.6 GeV self-polarized lepton beam of HERA accelerator and a longitudinally or transversely polarized or unpolarized gas target. The latest results for spin density matrix elements of exclusive $\phi$ meson production using the full statistics collected at HERMES are presented. Conclusions on the helicity amplitudes, which are related to spin density matrix elements, are also presented., Proc. of DIS 2012, 951 - 954; DESY-PROC-2012-02; ISSN 1435-8077

Published
2012

12. Polarization, motion, and fragmentation: Exploring the role of quarks in the nucleon through semi-inclusive longitudinal spin asymmetries at HERMES

Author

Rubin, Joshua George

Subjects
data analysis method, longitudinal [polarized target], nucleon: polarizability, parton: distribution function, HERMES, hadron: electroproduction, electroproduction [hadron], helicity [quark], semi-inclusive reaction [electron deuteron], polarized target: longitudinal, quark: helicity, polarizability [nucleon], longitudinal [polarized beam], model [fragmentation], fragmentation: model, hadron: multiplicity, 27.6 GeV, thesis, multiplicity [hadron], semi-inclusive reaction [electron p], electron p: semi-inclusive reaction, DESY HERA Stor, electron deuteron: semi-inclusive reaction, polarized beam: longitudinal, asymmetry [spin], distribution function [parton], spin: asymmetry
Abstract

University of Illinois, Diss., 2009; 121 pp., (2009). doi:10.3204/DESY-THESIS-2009-045, The motivation for this work was to improve upon prior analyses that extracted the quark helicity distributions, ¢q(x), of the proton. These extractions, performed by the HERMES collaboration, were excellent analyses, the most recent of which contained the vast majority of the data analyzed here. \If they were so good, how much could you improve on their results?' one might ask. Well, not to spoil the punch line, but some. The precision was improved modestly and our understanding of the systematic uncertainties was improved more signi¯cantly. The reader is welcome to jump to Chapter 6 and see. The approach that we took however was to try many new things. Not all of these e®orts yielded improvements on the scale we had hoped for, but many interesting new techniques were developed and we were able to produce several related new results along the way. Let me suggest then that rather than thinking of Chapter 6 as the result of this analysis, consider that there are valuable new results and insights scattered throughout this work. Chapter 4 contains several new double-spin asymmetries which are results in their own right. The ph? dependence is plotted for the ¯rst time with HERMES data which is uniquely hadron separated. The hadron charge di®erence asymmetry is presented which, in combination with the quark helicity densities of Chapter 6, can put limits on fragmentation symmetry breaking in semi-inclusive DIS. Additionally, a novel method of unfolding yields (reducing smearing e®ects from detector resolution limitations and QED radiation) was developed and presented here for the ¯rst time which potentially allows new kinds of asymmetries to be constructed which were unavailable before. Also, this chapter describes the method by which the ¯rst ever three dimensionally binned SIDIS double-spin asymmetries were produced. These asymmetries, which will be used as the data inputs for the ¢q(x) extraction, are valuable inputs to world ¯ts being performed by theorists. Chapter 5 further explores this idea of fragmentation symmetry breaking with Monte Carlo studies of fragmentation functions. These studies test assumptions which are frequently made in the interpretation of asymmetries like the hadron charge di®erence of the prior chapter and suggest that these assumptions should be approached with some caution. Also, a technique for tuning and more importantly propagating systematic uncertainty through non-analytic Monte Carlo models, like the Lund-String model which provides an essential input to the ¢q(x) extraction, is developed vi and potentially has widespread applications. That being said, the author hopes you enjoy the techniques developed and results presented in the following chapters., Published by Deutsches Elektronen-Synchrotron, DESY, Hamburg

Published
2009
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13. Transverse-target single-spin azimuthal asymmetry in hard exclusive electroproduction of single pions at HERMES

Author

Hristova, Ivana, Kolanoski, Hermann, Ryckbosch, Dirk, and Kowalski, Marek

Subjects
angular distribution: asymmetry, pi+: electroproduction, HERMES, exclusive, inelastic scattering [positron p], positron p: inelastic scattering, quantum chromodynamics: factorization, ddc:530, Quantenchromodynamik, exklusiv, Protonstruktur, proton structure, factorization [quantum chromodynamics], 27.6 GeV, polarized target: transverse, transverse [polarized target], thesis, 530 Physik, +n+pi%2B+positron%22">positron --> n pi+ positron, QCD, 29 Physik, Astronomie, DESY HERA Stor, asymmetry [angular distribution], Asymmetrie, electroproduction [pi+], asymmetry [spin], spin: asymmetry, asymmetry, experimental results
Abstract

Wir präsentieren die Analyse der Daten, die in den Jahren 2002-2004 mit dem 27.56 GeV Positronenstrahl des HERA Speicherrings am DESY und dem internen transversal polarisierten Wasserstofftarget (''fixed target'') des HERMES Experiments aufgenommen wurden. Ereignisse mit einem gestreuten Positron und einem erzeugter Pion wurden selektiert. Die ausschließliche Erzeugung eines einzelnen Pions, e p -> e'' n pi+, wird durch die Anforderung gewährleistet, daß die fehlende Masse des Ereignisses der Masse des Neutrons, das nicht gemessen wird, entspricht. Der Streuquerschnitt für diesen Prozess hängt von der Bjorken-Skalenvariable, den Vierer-Impulsübertrag und den Transversalimpulsübertrag, deren durchschnittliche Werte für unsere Datensätze bei =0.12, =2.3 GeV^2, =-0.18 GeV^2 liegen, sowie zwei azimuthale Winkel: der Winkel phi zwischen den Streu- und Produktionsebene (die Schnittlinie der Ebenen enthält das virtuelle Photon), und der Winkel phi_S zwischen der Streuebene und dem Polarisationsvector des Targets. Die Asymmetrie, auch Transversal-Target-Einzelspin-Azimuthalasymmetrie genannt, wird als das Verhältnis der Differenz zur Summ der Streuquerschnitte für die positive und negative Targetpolarisation definiert. Es wird durch sechs azimuthale Sinus-Modulationen charakterisiert, deren Amplituden von -1 bis 1 varieren können. Wir messen die Asymmetrie eines Datensatzes von 2093 Ereignissen mit einem Signal-Rausch-Verhältnis von 1:1. Im Durchschnitt wurden geringe oder mit Null übereinstimmende Amplitudenwerte gefunden, abgesehen von der Amplitude von der sin(phi_S) Modulation, allerdings innerhalb der großen exprimentellen Unsicherheiten. Ein direkter und genauerer Vergleich der Daten mit der Theorie verlangt größere Statistik und verbesserte Fähigkeiten des Detektor als für die vorliegende Messung vorhanden waren., We present the analysis of data taken in the years 2002-2004 with the 27.56 GeV positron beam of the HERA storage ring at DESY and the internal transversely polarised hydrogen fixed target of the HERMES experiment. Events with a scattered positron and a produced pion are selected. Exclusive production of single pions, e p -> e'' n pi+, is ensured by requiring the missing mass in the event to be equal to the mass of the neutron, which is not detected. The cross section for this process depends on the Bjorken scaling variable, the four-momentum transfer, and the transverse four-momentum transfer, whose average values for our sample are =0.12, =2.3 GeV^2, =-0.18 GeV^2, respectively, and two azimuthal angles: the angle phi between the scattering and production planes (their common line contains the virtual photon), and the angle phi_S between the scattering plane and the target polarisation vector. The asymmetry, also called transverse-target single-spin azimuthal asymmetry, is defined as the ratio of the difference to the sum of the cross sections for positive and negative target polarisation. It is characterised by six azimuthal sine modulations, whose amplitudes can vary from -1 to 1. We measure the asymmetry from a sample of 2093 events with a signal-to-background ratio of 1:1. At average kinematics, the values of the amplitudes are found to be small or consistent with zero, except for the amplitude of the sin(phi_S) modulation, however, within their large statistical uncertainties. A direct and more precise data-to-theory comparison requires larger statistics and improved detector capabilities than available for the present measurement.

Published
2008

14. DVCS at HERMES: The recoil detector & transverse target spin asymmetries

Author

Murray, Morgan J.

Subjects
electron p: deep inelastic scattering, generalized parton distribution, Physics::Instrumentation and Detectors, HERMES [magnetic spectrometer], polarized beam, deeply virtual Compton scattering, deep inelastic scattering [positron p], Nuclear Experiment, angular momentum [quark], magnetic spectrometer: HERMES, positron p: deep inelastic scattering, 27.6 GeV, polarized target: transverse, quark: angular momentum, transverse [polarized target], thesis, parametrization, photon: electroproduction, DESY HERA Stor, deep inelastic scattering [electron p], High Energy Physics::Experiment, nucleon: spin, electroproduction [photon], spin [nucleon], asymmetry [spin], spin: asymmetry, detector: recoil, recoil [detector], experimental results
Abstract

University of Glasgow, Diss., 2007; 129 pp., (2007). doi:10.3204/DESY-THESIS-2008-006, The HERMES experiment is a large forward angle spectrometer located at the HERA accelerator ring at DESY, Hamburg. One of the most exciting topics studied at HERMES is Deeply Virtual Compton Scattering (DVCS) which is the simplest interaction that provides a gateway for access to Generalised Parton Distributions (GPDs). GPDs are a theoretical framework which can be used to calculate the total angular momentum of the quarks in the nucleon. As such, they provide one piece of the puzzle of nucleonic spin structure. In 2005, HERMES was upgraded in the target region with a Recoil Detector that allows it to make truly exclusive measurements of the DVCS interaction for the rst time. The design and construction of the Recoil Detector is discussed herein, in addition to a complete analysis of the Transverse Target Spin Asymmetry (TTSA) in DVCS. Experimental facilities that enable measurement of this asymmetry are rare. The importance of the information on the TTSA from HERMES is made yet greater as the transversely polarised target that allows the asymmetry to be measured has been replaced by an unpolarised target. This was to allow the Recoil Detector to be installed. The nal stage of this thesis shows a model-dependent method for constraining the angular momentum of the quarks in the nucleon and speculates as to the other pieces of the spin puzzle., Published by Deutsches Elektronen-Synchrotron, DESY, Hamburg

Published
2007
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15. Transverse Polarization of Lambda and Lambda-bar Hyperons in Quasi-Real Photon-Nucleon Scattering at HERMES

Author

Airapetian, A., Akopov, N., Avetissian, E., Mikloukho, O., Miller, C. A., Miyachi, Y., Muccifora, V., Nagaitsev, A., Nappi, E., Naryshkin, Y., Nass, A., Nowak, W.-D., Oganessyan, K., Bailey, P., Ohsuga, H., Orlandi, G., Potashov, S., Potterveld, D. H., Raithel, M., Reggiani, D., Reimer, P. E., Reischl, A., Reolon, A. R., Rith, K., Baturin, V., Rosner, G., Rostomyan, A., Ryckbosch, D., Sanjiev, I., Savin, I., Scarlett, C., Schafer, A., Schill, C., Schnell, G., Schuler, K. P., Baumgarten, C., Schwind, A., Seibert, J., Seitz, B., Shanidze, R., Shibata, T.-A., Shutov, V., Simani, M. C., Sinram, K., Stancari, M., Statera, M., Beckmann, M., Steffens, E., Steijger, J. J. M., Stewart, J., Stosslein, U., Tanaka, H., Taroian, S., Tchuiko, B., Terkulov, A., Tessarin, S., Thomas, E., Belostotski, S., Tkabladze, A., Trzcinski, A., Tytgat, M., Urciuoli, G. M., van der Nat, P. B., van der Steenhoven, G., van de Vyver, R., Veretennikov, D., Vetterli, M. C., Vikhrov, V., Bernreuther, S., Vincter, M. G., Visser, J., Vogt, M., Volmer, J., Weiskopf, C., Wendland, J., Wilbert, J., Wise, T., Yen, S., Yoneyama, S., Bianchi, N., Zihlmann, B., Zohrabian, H., Zupranski, P., HERMES Collaboration, Blok, H. P., Bottcher, H., Akopov, Z., Borissov, A., Bouwhuis, M., Brack, J., Brull, A., Brunn, I., Capitani, G. P., Chiang, H. C., Ciullo, G., Contalbrigo, M., Court, G. R., Amarian, M., Dalpiaz, P. F., De Leo, R., De Nardo, L., De Sanctis, E., Devitsin, E., Di Nezza, P., Duren, M., Ehrenfried, M., Elalaoui-Moulay, A., Elbakian, G., Ammosov, V. V., Ellinghaus, F., Elschenbroich, U., Ely, J., Fabbri, R., Fantoni, A., Fechtchenko, A., Felawka, L., Fox, B., Franz, J., Frullani, S., Andrus, A., Garber, Y., Gapienko, G., Gapienko, V., Garibaldi, F., Garutti, E., Gaskell, D., Gavrilov, G., Gharibyan, V., Graw, G., Grebeniouk, O., Aschenauer, E. C., Greeniaus, L. G., Haeberli, W., Hafidi, K., Hartig, M., Hasch, D., Heesbeen, D., Henoch, M., Hertenberger, R., Hesselink, W. H. A., Hillenbrand, A., Augustyniak, W., Holler, Y., Hommez, B., Iarygin, G., Izotov, A., Jackson, H. E., Jgoun, A., Kaiser, R., Kinney, E., Kisselev, A., Konigsmann, K., Avakian, R., Kolster, H., Kopytin, M., Korotkov, V., Kozlov, V., Krauss, B., Krivokhijine, V. G., Lagamba, L., Lapikas, L., Laziev, A., Lenisa, P., Avetissian, A., Liebing, P., Lindemann, T., Lipka, K., Lorenzon, W., Makins, N. C. R., Marukyan, H., Masoli, F., Menden, F., Mexner, V., and Meyners, N.

Subjects
+Lambda+positron+anything%22">positron nucleon --> Lambda positron anything, longitudinal [polarized target], transverse [polarization], momentum dependence, HERMES, transverse momentum dependence, deep inelastic scattering [positron nucleon], polarized target: longitudinal, polarization: transverse, ddc:530, Nuclear Experiment, Antilambda: polarization, longitudinal [polarized beam], photoproduction [Lambda], 27.6 GeV, High Energy Physics::Phenomenology, Lambda: polarization, Lambda: photoproduction, DESY HERA Stor, positron nucleon: deep inelastic scattering, polarized beam: longitudinal, High Energy Physics::Experiment, polarization [Antilambda], polarization [Lambda], experimental results
Abstract

Physical review / D 76(9), 092008 (2007). doi:10.1103/PhysRevD.76.092008, The HERMES experiment has measured the transverse polarization of Lambda and Lambda-bar hyperons produced inclusively in quasireal photoproduction at a positron beam energy of 27.6 GeV. The transverse polarization of the Lambda hyperon is found to be positive while the observed Lambda-bar polarization is compatible with zero. The transverse polarization values averaged over the kinematic acceptance of HERMES are 0.078 +/- 0.006(stat) +/- 0.012(syst) and -0.025 +/- 0.015(stat) +/- 0.018(syst) for Lambda and Lambda-bar hyperons, respectively. The dependences of Lambda and Lambda-bar polarizations on the fraction $\zeta$ of the beam's light-cone momentum carried by the hyperon and on the hyperon's transverse momentum $p_T$ were investigated. The measured Lambda polarization rises linearly with $p_T$ and exhibits a different behavior for low and high values of $\zeta$, which approximately correspond to the backward and forward regions in the center-of-mass frame of the $\gamma^*N$ reaction., Published by Soc., [S.l.]

Published
2007

16. Deeply virtual Compton scattering and the HERMES recoil-detector

Author

Krauss, Bernhard

Subjects
positron deuteron: exclusive reaction, interference: Bethe-Heitler, data analysis method, generalized parton distribution, longitudinal [polarized target], tensor [polarization], upgrade: proposed, polarized beam, HERMES, exclusive reaction [positron deuteron], emission [photon], +deuteron+electron+photon%22">electron deuteron --> deuteron electron photon, photon: emission, proposed [upgrade], polarized target: longitudinal, Bethe-Heitler [interference], recoil [counters and detectors], +n+p%22">electron deuteron --> n p, asymmetry [charge], programming: Monte Carlo, polarization: tensor, 27.6 GeV, electron deuteron: exclusive reaction, thesis, bibliography, Monte Carlo [numerical calculations], DESY HERA Stor, counters and detectors: recoil, exclusive reaction [electron deuteron], off-shell [Compton scattering], charge: asymmetry, Compton scattering: off-shell, Monte Carlo [programming], numerical calculations: Monte Carlo, asymmetry [spin], spin: asymmetry, performance, experimental results
Abstract

Friedrich-Alexander-Universität Erlangen-Nürnberg, Diss., 2005; 303 pp., (2005). doi:10.3204/DESY-THESIS-2005-008, Published by Deutsches Elektronen-Synchrotron, DESY, Hamburg

Published
2005

17. Precision measurements of the spin-dependent structure functions g$^p_1$ and g$^d_1$ of the proton and the deuteron and extraction of the neutron spin structure function g$^n_1$ at HERMES

Author

Ehrenfried, Markus

Subjects
electron p: deep inelastic scattering, cross section, electron: polarized beam, 27.6 GeV, n: structure function, thesis, deuteron: structure function, structure function: ratio, HERMES, structure function: spin, electron deuteron: deep inelastic scattering, momentum transfer dependence, x-dependence, DESY HERA Stor, polarization: asymmetry, polarized target: internal, p: structure function, experimental results
Abstract

Friedrich-Alexander-Universität Erlangen-Nürnberg, Diss., 2005; 127 pp., (2005). doi:10.3204/DESY-THESIS-2005-041, Published by Deutsches Elektronen-Synchrotron, DESY, Hamburg

Published
2005
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18. The first measurement of the tensor structure function $\mathrm{b^d_1}$ of the deuteron with the HERMES-experiment

Author

Riedl, Caroline

Subjects
positron: polarized beam, Born approximation, deuteron: polarized target, sea [quark], deep inelastic scattering [positron deuteron], tensor [polarization], HERMES, momentum transfer dependence, tensor [structure function], x-dependence, polarization: asymmetry, structure function: tensor, structure function: moment, quark: sea, structure function [deuteron], polarization: tensor, 27.6 GeV, deuteron: structure function, thesis, bibliography, polarization [quark], multiple scattering, sum rule, DESY HERA Stor, positron deuteron: deep inelastic scattering, asymmetry [polarization], shadowing, polarized beam [positron], moment [structure function], quark: polarization, polarized target [deuteron], experimental results
Abstract

Friedrich-Alexander-Universität Erlangen-Nürnberg, Diss., 2005; 158 pp., (2005). doi:10.3204/DESY-THESIS-2005-027, Published by Deutsches Elektronen-Synchrotron, DESY, Hamburg

Published
2005

19. Deeply virtual Compton scattering on neon

Author

Haan, S.

Subjects
positron: polarized beam, generalized parton distribution, 27.6 GeV, thesis, amplitude analysis, HERMES, momentum transfer dependence, photon: electroproduction, positron nucleus: deep inelastic scattering, x-dependence, DESY HERA Stor, deeply virtual Compton scattering, deep inelastic scattering [positron nucleus], coherent interaction, incoherent interaction, polarized beam [positron], neon, electroproduction [photon], asymmetry [spin], spin: asymmetry, experimental results
Abstract

Universität Leipzig, Diss., 2005; 92 pp. (2005). = Universität Leipzig, Diss., 2005

Published
2005

20. Precision measurements of the spin-dependent structure functions $\mathrm{g^p_1}$ and $\mathrm{g^d_1}$ of the proton and the deuteron and extraction of the neutron spin structure function $\mathrm{g^n_1}$ at HERMES

Author

Ehrenfried, Markus

Subjects
internal [polarized target], polarized beam [electron], cross section, structure function [deuteron], ratio [structure function], 27.6 GeV, structure function [n], thesis, HERMES, structure function [p], momentum transfer dependence, x-dependence, DESY HERA Stor, asymmetry [polarization], deep inelastic scattering [electron p], deep inelastic scattering [electron deuteron], spin [structure function], experimental results
Published
2005

21. Measurement and simulation of the fragmentation process at HERMES

Author

Hillenbrand, Achim

Subjects
deep inelastic scattering [positron deuteron], pi, HERMES, fragmentation function, multiple production [charged particle], charged particle: multiple production, model: hadronization, deep inelastic scattering [positron p], RICH, tables, positron p: deep inelastic scattering, hadron: multiplicity, 27.6 GeV, thesis, multiplicity [hadron], parametrization, bibliography, Monte Carlo [numerical calculations], fragmentation [quark], anti-p, DESY HERA Stor, positron deuteron: deep inelastic scattering, quark: fragmentation, hadronization [model], numerical calculations: Monte Carlo, experimental results
Abstract

Friedrich-Alexander-Universität Erlangen-Nürnberg, Diss., 2005; 177 pp., (2005). doi:10.3204/DESY-THESIS-2005-035, Published by Deutsches Elektronen-Synchrotron, DESY, Hamburg

Published
2005
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22. Flavor decomposition of the sea quark helicity distributions in the nucleon from semiinclusive deep inelastic scattering

Author

Airapetian, A., Akopov, N., Avetissian, E., Mexner, V., Meyners, N., Mikloukho, O., Miller, C. A., Miyachi, Y., Muccifora, V., Nagaitsev, A., Nappi, E., Naryshkin, Y., Nass, A., Bailey, P., Negodaev, M., Nowak, W.-D., Oganessyan, K., Ohsuga, H., Orlandi, G., Pickert, N., Potashov, S., Potterveld, D. H., Raithel, M., Reggiani, D., Baturin, V., Reimer, P. E., Reischl, A., Reolon, A. R., Riedl, C., Rith, K., Rosner, G., Rostomyan, A., Rubacek, L., Ryckbosch, D., Salomatin, Y., Baumgarten, C., Sanjiev, I., Savin, I., Scarlett, C., Schafer, A., Schill, C., Schnell, G., Schuler, K. P., Schwind, A., Seele, J., Seidl, R., Beckmann, M., Seitz, B., Shanidze, R., Shearer, C., Shibata, T.-A., Shutov, V., Simani, M. C., Sinram, K., Stancari, M., Statera, M., Steffens, E., Belostotski, S., Steijger, J. J. M., Stewart, J., Stosslein, U., Tait, P., Tanaka, H., Taroian, S., Tchuiko, B., Terkulov, A., Tkabladze, A., Trzcinski, A., Bernreuther, S., Tytgat, M., Vandenbroucke, A., van der Nat, P., van der Steenhoven, G., Vetterli, M. C., Vikhrov, V., Vincter, M. G., Visser, J., Vogel, C., Vogt, M., Bianchi, N., Volmer, J., Weiskopf, C., Wendland, J., Wilbert, J., Ybeles Smit, G., Yen, S., Zihlmann, B., Zohrabian, H., Zupranski, P., HERMES Collaboration, Blok, H. P., Bottcher, H., Akopov, Z., Borissov, A., Bouwhuis, M., Brack, J., Brull, A., Bryzgalov, V., Capitani, G. P., Chiang, H. C., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Amarian, M., De Leo, R., De Nardo, L., De Sanctis, E., Devitsin, E., Di Nezza, P., Duren, M., Ehrenfried, M., Elalaoui-Moulay, A., Elbakian, G., Ellinghaus, F., Ammosov, V. V., Elschenbroich, U., Ely, J., Fabbri, R., Fantoni, A., Fechtchenko, A., Felawka, L., Fox, B., Franz, J., Frullani, S., Garber, Y., Andrus, A., Gapienko, G., Gapienko, V., Garibaldi, F., Garrow, K., Garutti, E., Gaskell, D., Gavrilov, G., Gharibyan, V., Graw, G., Grebeniouk, O., Aschenauer, E. C., Greeniaus, L. G., Hafidi, K., Hartig, M., Hasch, D., Heesbeen, D., Henoch, M., Hertenberger, R., Hesselink, W. H. A., Hillenbrand, A., Hoek, M., Augustyniak, W., Holler, Y., Hommez, B., Iarygin, G., Ivanilov, A., Izotov, A., Jackson, H. E., Jgoun, A., Kaiser, R., Kinney, E., Kisselev, A., Avakian, R., Konigsmann, K., Kopytin, M., Korotkov, V., Kozlov, V., Krauss, B., Krivokhijine, V. G., Lagamba, L., Lapikas, L., Laziev, A., Lenisa, P., Avetissian, A., Liebing, P., Lindemann, T., Lipka, K., Lorenzon, W., Lu, J., Maiheu, B., Makins, N. C. R., Marianski, B., Marukyan, H., and Masoli, F.

Subjects
sea [quark], momentum spectrum [quark], High Energy Physics::Lattice, deep inelastic scattering [positron deuteron], Nuclear Theory, HERMES, absorption [photon], x-dependence, inclusive reaction [positron deuteron], helicity [quark], ddc:550, Nuclear Experiment, 27.6 GeV, High Energy Physics::Phenomenology, DESY HERA Stor, electroproduction [K+], electroproduction [K-], flavor [quark], High Energy Physics::Experiment, asymmetry [flavor], polarized beam [positron], polarized target [deuteron], electroproduction [pi+], asymmetry [spin], electroproduction [pi-], experimental results
Abstract

Double-spin asymmetries of semi-inclusive cross sections for the production of identified pions and kaons have been measured in deep-inelastic scattering of polarized positrons on a polarized deuterium target. Five helicity distributions including those for three sea quark flavors were extracted from these data together with re-analyzed previous data for identified pions from a hydrogen target. These distributions are consistent with zero for all three sea flavors. A recently predicted flavor asymmetry in the polarization of the light quark sea appears to be disfavored by the data.

Published
2004

23. Flavor decomposition of the sea quark helicity distributions in the nucleon from semiinclusive deep inelastic scattering

Author

Airapetian, A., Akopov, N., Akopov, Z., Amarian, M., Ammosov, V. V., Andrus, A., Aschenauer, E. C., Augustyniak, W., Avakian, R., Avetissian, A., Avetissian, E., Bailey, P., Baturin, V., Baumgarten, C., Beckmann, M., Belostotski, S., Bernreuther, S., Bianchi, N., Blok, H. P., Bottcher, H., Borissov, A., Bouwhuis, M., Brack, J., Brull, A., Bryzgalov, V., Capitani, G. P., Chiang, H. C., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., De Leo, R., De Nardo, L., De Sanctis, E., Devitsin, E., Di Nezza, P., Duren, M., Ehrenfried, M., Elalaoui-Moulay, A., Elbakian, G., Ellinghaus, F., Elschenbroich, U., Ely, J., Fabbri, R., Fantoni, A., Fechtchenko, A., Felawka, L., Fox, B., Franz, J., Frullani, S., Garber, Y., Gapienko, G., Gapienko, V., Garibaldi, F., Garrow, K., Garutti, E., Gaskell, D., Gavrilov, G., Gharibyan, V., Graw, G., Grebeniouk, O., Greeniaus, L. G., Hafidi, K., Hartig, M., Hasch, D., Heesbeen, D., Henoch, M., Hertenberger, R., Hesselink, W. H. A., Hillenbrand, A., Hoek, M., Holler, Y., Hommez, B., Iarygin, G., Ivanilov, A., Izotov, A., Jackson, H. E., Jgoun, A., Kaiser, R., Kinney, E., Kisselev, A., Konigsmann, K., Kopytin, M., Korotkov, V., Kozlov, V., Krauss, B., Krivokhijine, V. G., Lagamba, L., Lapikas, L., Laziev, A., Lenisa, P., Liebing, P., Lindemann, T., Lipka, K., Lorenzon, W., Lu, J., Maiheu, B., Makins, N. C. R., Marianski, B., Marukyan, H., Masoli, F., Mexner, V., Meyners, N., Mikloukho, O., Miller, C. A., Miyachi, Y., Muccifora, V., Nagaitsev, A., Nappi, E., Naryshkin, Y., Nass, A., Negodaev, M., Nowak, W.-D., Oganessyan, K., Ohsuga, H., Orlandi, G., Pickert, N., Potashov, S., Potterveld, D. H., Raithel, M., Reggiani, D., Reimer, P. E., Reischl, A., Reolon, A. R., Riedl, C., Rith, K., Rosner, G., Rostomyan, A., Rubacek, L., Ryckbosch, D., Salomatin, Y., Sanjiev, I., Savin, I., Scarlett, C., Schafer, A., Schill, C., Schnell, G., Schuler, K. P., Schwind, A., Seele, J., Seidl, R., Seitz, B., Shanidze, R., Shearer, C., Shibata, T.-A., Shutov, V., Simani, M. C., Sinram, K., Stancari, M., Statera, M., Steffens, E., Steijger, J. J. M., Stewart, J., Stosslein, U., Tait, P., Tanaka, H., Taroian, S., Tchuiko, B., Terkulov, A., Tkabladze, A., Trzcinski, A., Tytgat, M., Vandenbroucke, A., Van Der Nat, P., Van Der Steenhoven, G., Vetterli, M. C., Vikhrov, V., Vincter, M. G., Visser, J., Vogel, C., Vogt, M., Volmer, J., Weiskopf, C., Wendland, J., Wilbert, J., Ybeles Smit, G., Yen, S., Zihlmann, B., Zohrabian, H., and Zupranski, P.

Subjects
positron: polarized beam, deuteron: polarized target, quark: sea, quark: flavor, 27.6 GeV, pi+: electroproduction, photon: absorption, HERMES, quark: momentum spectrum, x-dependence, K-: electroproduction, DESY HERA Stor, positron deuteron: deep inelastic scattering, positron deuteron: inclusive reaction, pi-: electroproduction, K+: electroproduction, flavor: asymmetry, quark: helicity, spin: asymmetry, experimental results
Abstract

Physical review letters 92(1), 012005 (2004). doi:10.1103/PhysRevLett.92.012005, Double-spin asymmetries of semi-inclusive cross sections for the production of identified pions and kaons have been measured in deep-inelastic scattering of polarized positrons on a polarized deuterium target. Five helicity distributions including those for three sea quark flavors were extracted from these data together with re-analyzed previous data for identified pions from a hydrogen target. These distributions are consistent with zero for all three sea flavors. A recently predicted flavor asymmetry in the polarization of the light quark sea appears to be disfavored by the data., Published by APS, College Park, Md.

Published
2004
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24. Messung der spinabhängigen Strukturfunktion g$^d_1$ des Deuterons mit dem HERMES-Experiment

Author

Weiskopf, Christoph

Subjects
positron: polarized beam, tables, cross section: asymmetry, structure function [deuteron], 27.6 GeV, deep inelastic scattering [positron deuteron], polarized target [deuterium], thesis, deuteron: structure function, bibliography, HERMES, structure function: spin, DESY HERA Stor, positron deuteron: deep inelastic scattering, deuterium: polarized target, radiative correction, polarized beam [positron], spin [structure function], asymmetry [cross section], experimental results
Abstract

Friedrich-Alexander-Universität Erlangen-Nürnberg, Diss., 2002; 211 pp., (2002). doi:10.3204/DESY-THESIS-2002-039, Published by Deutsches Elektronen-Synchrotron, DESY, Hamburg

Published
2002
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25. Transverse polarization of Lambda hyperons from quasireal photoproduction on nuclei

Author

Y. Imazu, J. Bowles, Wouter Deconinck, M. Contalbrigo, C. A. Miller, Morgan Murray, Martin Raithel, P. E. Reimer, T. A. Shibata, E. C. Aschenauer, R.O. Avakian, E. De Sanctis, V. Gharibyan, Franco Garibaldi, M. Negodaev, V. Zagrebelnyy, Andreas Mussgiller, V. A. Gapienko, David Mahon, Y. Holler, Y. J. Mao, W.-D. Nowak, P. Kravchenko, Andreas Schäfer, Valeria Muccifora, Cynthia Marie Hadjidakis, Y. Miyachi, W. Augustyniak, Stephen V. Gliske, A. Martinez de la Ossa, H. S. Jo, Y. Salomatin, G. Schnell, C. Van Hulse, E. Avetisyan, L. Felawka, T. Keri, C. Riedl, D. Hasch, B. Q. Ma, Eugenio Nappi, Salvatore Frullani, K. P. Schüler, W. Yu, S. Yaschenko, G. P. Capitani, S. Belostotski, V. Bryzgalov, M. Stancari, D. Zeiler, R. Perez-Benito, R. De Leo, B. Zihlmann, Klaus Rith, X. R. Lu, B. Marianski, Alexander Borissov, M. Ehrenfried, M. Statera, B. Seitz, P. F. Dalpiaz, Nicola Bianchi, A. Ivanilov, V. A. Korotkov, M. Capiluppi, H. E. Jackson, N. Akopov, V. G. Krivokhijine, V. Vikhrov, L. De Nardo, A. López Ruiz, G. Karyan, Vitaly Shutov, H. P. Blok, Zhenyu Ye, J. G. Rubin, Ralf Kaiser, Frank Ellinghaus, I. Lehmann, P. Lenisa, Adel Terkulov, Y. Van Haarlem, Wolfgang Lorenzon, E. Steffens, Ivana Hristova, E. R. Kinney, A. Trzcinski, G. Gavrilov, Alessandra Fantoni, M. Hoek, Y. Naryshkin, N. C. R. Makins, Arne Vandenbroucke, Riccardo Fabbri, F. Sanftl, G. Ciullo, A. Nass, I. Vilardi, G. Elbakian, D. Gabbert, J. Stewart, Dirk Ryckbosch, M. Hartig, S. I. Manaenkov, L. Lapikás, P. Di Nezza, M. Diefenthaler, H. Marukyan, A. Movsisyan, Michael Tytgat, J. J. M. Steijger, S. Taroian, Michael Düren, L. Lagamba, S. Joosten, A. Kisselev, Z. Akopov, V. Kozlov, Nagao Kobayashi, Luciano Pappalardo, P. Zupranski, G. Rosner, E. Cisbani, R. Truty, I. Brodski, A. Airapetian, Shan Wang, F. Stinzing, A. Rostomyan, A. R. Reolon, A. Avetissian, G. Gapienko, J. Burns, M. Golembiovskaya, D. Veretennikov, F. Giordano, A. Hillenbrand, Student Lab and Education, and (Astro)-Particles Physics

Subjects
HERMES experiment, ENERGIES, Nuclear Theory, 25.30.Rw Electroproduction reactions, HERMES, transverse momentum dependence, High Energy Physics - Experiment, Economica, Xenon, neon, HADRONIZATION, Nuclear Experiment, 13.60.Rj Baryon production, 13.88.+e Polarization in interactions and scattering, 14.20.Jn Hyperons, 25.30.Rw Electroproduction reactions, Physics, photoproduction [Lambda], dependence [mass number], 14.20.Jn Hyperons, HERA, Polarization (waves), INCLUSIVE PRODUCTION, DESY HERA Stor, GEV/C, P INTERACTIONS, polarization [Lambda], internal [polarized target], deuteron, COLLISIONS, Nuclear and High Energy Physics, Particle physics, transverse [polarization], chemistry.chemical_element, helium, Nuclear physics, inclusive reaction [electron nucleus], TARGETS, target [gas], Physics::Atomic and Molecular Clusters, ddc:530, 13.88.+e Polarization in interactions and scattering, krypton, 13.60.Rj Baryon production, 27.6 GeV, Krypton, High Energy Physics::Phenomenology, Hyperon, xenon, GEV-C, Physics and Astronomy, chemistry, High Energy Physics::Experiment, inclusive reaction [electron p], Storage ring, Lepton, experimental results
Abstract

The transverse polarization of $\Lambda$ hyperons was measured in inclusive quasireal photoproduction for various target nuclei ranging from hydrogen to xenon. The data were obtained by the HERMES experiment at HERA using the 27.6 GeV lepton beam and nuclear gas targets internal to the lepton storage ring. The polarization observed is positive for light target nuclei and is compatible with zero for krypton and xenon., Comment: final version to be published in Phys. Rev. D (in press)

Published
2014

26. Charged hadron lepto-production off unpolarized protons and deuterons at HERMES

Author

Karyan, Gevorg and HERMES Collaboration

Subjects
Particle physics, QC1-999, Positron beam, Nuclear Theory, Hadron, dependence [flavor], HERMES, Electron, momentum transfer dependence, transverse momentum dependence, 01 natural sciences, 7. Clean energy, fragmentation function [quark], x-dependence, electroproduction [hadron], Nuclear physics, Pion, 0103 physical sciences, ddc:530, deep inelastic scattering [positron p], Nuclear Experiment, 010306 general physics, Physics, 27.6 GeV, 010308 nuclear & particles physics, Scattering, charge dependence, High Energy Physics::Phenomenology, semi-inclusive reaction, DESY HERA Stor, Deuterium, Transverse momentum, deep inelastic scattering [electron p], High Energy Physics::Experiment, deep inelastic scattering [electron deuteron], multiplicity [pi], multiplicity [K], experimental results
Abstract

The HERMES collaboration has measured charge-separated pion and kaon multiplicities in semi-inclusive deep-inelastic scattering using a 27.6 GeV electron or positron beam scattering off a hydrogen or deuterium target. The results are presented as functions of the Bjorken variable x B , the negative squared four-momentum transfer Q 2 , a hadron fractional energy z and the hadron's transverse momentum. These data will be very useful to understand the quark-fragmentation process in deep-inelastic hadron electro-production and will serve as crucial input in the understanding of charge and flavour separated fragmentation functions. Furthermore, it provides important information on the transverse-momentum dependence of hadron production.

Published
2014

27. Extraction of the polarized quark distributions of the nucleon at the HERMES experiment with emphasis on the sea quarks

Author

Lindemann, T.

Subjects
internal [polarized target], sea [quark], momentum spectrum [quark], deep inelastic scattering [positron deuteron], strangeness [nucleon], pi, HERMES [magnetic spectrometer], hadron: electroproduction, structure function [nucleon], dependence: flavor, electroproduction [hadron], nucleon: strangeness, deep inelastic scattering [positron p], tables, quark: sea, magnetic spectrometer: HERMES, positron p: deep inelastic scattering, flavor [dependence], 27.6 GeV, thesis, parametrization, bibliography, polarization [quark], nucleon: structure function, quark: momentum spectrum, structure function: polarization, DESY HERA Stor, positron deuteron: deep inelastic scattering, polarization [structure function], valence [quark], quark: valence, polarized target: internal, nucleon: spin, spin [nucleon], quark: polarization, asymmetry [spin], spin: asymmetry, experimental results
Abstract

Universität Hamburg, Diss., 2001; 211 pp. (2001). = Universität Hamburg, Diss., 2001

Published
2001

28. Measurement of the polarized structure function $g1(x,Q**2)$ of the proton with the HERMES experiment

Author

Hasch, Delia

Subjects
positron: polarized beam, tables, cross section: asymmetry, positron p: deep inelastic scattering, 27.6 GeV, thesis, sum rule: Bjorken, bibliography, HERMES, structure function: polarization, DESY HERA Stor, hydrogen: polarized target, radiative correction, p: structure function, structure function: moment, experimental results
Abstract

Universität Hamburg, Diss., 2000; 151 pp. (2000). = Universität Hamburg, Diss., 2000

Published
2000
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