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172 results on '"Truty, R"'

1. What Do We Know So Far About Ventricular Arrhythmias and Sudden Cardiac Death Prediction in the Mitral Valve Prolapse Population? Could Biomarkers Help Us Predict Their Occurrence?

Author

Dziadosz, D., Daniłowicz-Szymanowicz, L., Wejner-Mik, P., Budnik, M., Brzezińska, B., Duchnowski, P., Golińska-Grzybała, K., Jaworski, K., Jedliński, I., Kamela, M., Kasprzak, J., Kowalczyk-Domagała, M., Kurnicka, K., Kustrzycka-Kratochwil, D., Mickiewicz, K., Możeńska, O., Oko-Sarnowska, Z., Plewka, M., Polewczyk, A., Uziębło-Życzkowska, B., Wierzbowska-Drabik, K., Wachnicka-Truty, R., Wołoszyn-Horák, E., Szymański, P., Gackowski, A., and Mizia-Stec, K.

Published
2024
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2. Longitudinal double-spin asymmetries in semi-inclusive deep-inelastic scattering of electrons and positrons by protons and deuterons

Author

HERMES Collaboration, Airapetian, A., Akopov, N., Akopov, Z., Aschenauer, E. C., Augustyniak, W., Avakian, R., Avetissian, A., Belostotski, S., Blok, H. P., Borissov, A., Bryzgalov, V., Capitani, G. P., Cisbani, E., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Deconinck, W., De Leo, R., De Nardo, L., De Sanctis, E., Diefenthaler, M., Di Nezza, P., Düren, M., Elbakian, G., Ellinghaus, F., Fantoni, A., Felawka, L., Frullani, S., Gavrilov, G., Gharibyan, V., Giordano, F., Gliske, S., Hasch, D., Holler, Y., 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., Lorenzon, W., Ma, B. -Q., Mahon, D., Manaenkov, S. I., Mao, Y., Marianski, B., Marukyan, H., Miyachi, Y., Movsisyan, A., Muccifora, V., Mussgiller, A., Naryshkin, Y., Nass, A., Nazaryan, G., 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., Seitz, B., Shibata, T. -A., Statera, M., Steffens, E., Steijger, J. J. M., Taroian, S., Terkulov, A., Truty, R., Trzcinski, A., Tytgat, M., van der Nat, P. B., Van Haarlem, Y., Van Hulse, C., Veretennikov, D., Vikhrov, V., Vilardi, I., Vogel, C., Wang, S., Yaschenko, S., Zihlmann, B., and Zupranski, P.

Subjects
High Energy Physics - Experiment, High Energy Physics - Phenomenology
Abstract

A comprehensive collection of results on longitudinal double-spin asymmetries is presented for charged pions and kaons produced in semi-inclusive deep-inelastic scattering of electrons and positrons on the proton and deuteron, based on the full HERMES data set. The dependence of the asymmetries on hadron transverse momentum and azimuthal angle extends the sensitivity to the flavor structure of the nucleon beyond the distribution functions accessible in the collinear framework. No strong dependence on those variables is observed. In addition, the hadron charge-difference asymmetry is presented, which under certain model assumptions provides access to the helicity distributions of valence quarks.

Published
2018
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3. Ratios of helicity amplitudes for exclusive $\rho^0$ electroproduction on transversely polarized protons

Author

The HERMES Collaboration, Airapetian, A., Akopov, N., Akopov, Z., Aschenauer, E. C., Augustyniak, W., Belostotski, S., Blok, H. P., Borissov, A., Bryzgalov, V., Capitani, G. P., Ciullo, G., Contalbrigo, M., Deconinck, W., De Leo, R., De Sanctis, E., Düren, M., Elbakian, G., Ellinghaus, F., Felawka, L., Frullani, S., Garibaldi, F., Gavrilov, G., Gharibyan, V., Goloskokov, S. V., Holler, Y., Ivanilov, A., Jackson, H. E., Joosten, S., Kaiser, R., Karyan, G., Kisselev, A., Korotkov, V., Kozlov, V., Kravchenko, P., Kroll, P., Lagamba, L., Lapikás, L., Lehmann, I., Lenisa, P., Lorenzon, W., Manaenkov, S. I., Marianski, B., Marukyan, H., Miyachi, Y., Movsisyan, A., Muccifora, V., Nass, A., Nowak, W. -D., Pappalardo, L. L., Petrosyan, A., Reimer, P. E., Reolon, A. R., Riedl, C., Rith, K., Rosner, G., Rostomyan, A., Ryckbosch, D., Salomatin, Y., Schäfer, A., Schnell, G., Seitz, B., Shibata, T. -A., Shutov, V., Statera, M., Terkulov, A., Truty, R., Trzcinski, A., Tytgat, M., Van Haarlem, Y., Van Hulse, C., Veretennikov, D., Vikhrov, V., Vilardi, I., Yaschenko, S., Zihlmann, B., and Zupranski, P.

Subjects
High Energy Physics - Experiment, High Energy Physics - Phenomenology
Abstract

Exclusive $\rho^0$-meson electroproduction is studied by the HERMES experiment, using the 27.6 GeV longitudinally polarized electron/positron beam of HERA and a transversely polarized hydrogen target, in the kinematic region 1.0 GeV$^2$

Published
2017
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4. Transverse-target-spin asymmetry in exclusive $\omega$-meson electroproduction

Author

The HERMES Collaboration, Airapetian, A., Akopov, N., Akopov, Z., Aschenauer, E. C., Augustyniak, W., Avetissian, A., Belostotski, S., Blok, H. P., Borissov, A., Bryzgalov, V., Capitani, G. P., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Deconinck, W., De Leo, R., De Sanctis, E., Diefenthaler, M., Di Nezza, P., Düren, M., Elbakian, G., Ellinghaus, F., Felawka, L., Frullani, S., Gabbert, D., Gapienko, G., Gapienko, V., Gharibyan, V., Giordano, F., Gliske, S., Hasch, D., Hoek, M., Holler, Y., Ivanilov, A., Jackson, H. E., Joosten, S., Kaiser, R., Karyan, G., Keri, T., Kinney, E., Kisselev, A., Korotkov, V., Kozlov, V., Krivokhijine, V. G., Lagamba, L., Lapikás, L., Lehmann, I., Lenisa, P., Lorenzon, W., Ma, B. -Q., Manaenkov, S. I., Mao, Y., Marianski, B., Marukyan, H., Miyachi, Y., Movsisyan, A., Muccifora, V., 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., Schnell, G., Seitz, B., Shibata, T. -A., Statera, M., Steffens, E., Steijger, J. J. M., Stinzing, F., Taroian, S., Terkulov, A., Truty, R., Trzcinski, A., Tytgat, M., Van Haarlem, Y., Van Hulse, C., Vikhrov, V., Vilardi, I., Vogel, C., Wang, S., Yaschenko, S., Yen, S., Zihlmann, B., and Zupranski, P.

Subjects
High Energy Physics - Experiment, High Energy Physics - Phenomenology
Abstract

Hard exclusive electroproduction of $\omega$ mesons is studied with the HERMES spectrometer at the DESY laboratory by scattering 27.6 GeV positron and electron beams off a transversely polarized hydrogen target. The amplitudes of five azimuthal modulations of the single-spin asymmetry of the cross section with respect to the transverse proton polarization are measured. They are determined in the entire kinematic region as well as for two bins in photon virtuality and momentum transfer to the nucleon. Also, a separation of asymmetry amplitudes into longitudinal and transverse components is done. These results are compared to a phenomenological model that includes the pion pole contribution. Within this model, the data favor a positive $\pi\omega$ transition form factor., Comment: DESY Report 15-149

Published
2015

5. Bose-Einstein correlations in hadron-pairs from lepto-production on nuclei ranging from hydrogen to xenon

Author

HERMES Collaboration, Airapetian, A., Akopov, N., Akopov, Z., Aschenauer, E. C., Augustyniak, W., Avakian, R., Avetissian, A., Avetisyan, E., Belostotski, S., Bianchi, N., Blok, H. P., Borissov, A., Bryzgalov, V., Burns, J., 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., Elbakian, G., Ellinghaus, F., Etzelmüller, E., Fabbri, R., Fantoni, A., Felawka, L., 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., Imazu, Y., 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., Ruiz, A. López, Lorenzon, W., Lu, X. -G., Ma, B. -Q., Mahon, D., Makins, N. C. R., Mao, Y., Marianski, B., de la Ossa, A. Martinez, Marukyan, H., Miyachi, Y., Movsisyan, A., Murray, M., Mussgiller, A., Nappi, E., 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., Shutov, V., Stahl, M., Stancari, M., Statera, 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, Z., Yen, S., Zihlmann, B., and Zupranski, P.

Subjects
High Energy Physics - Experiment, Nuclear Experiment
Abstract

Bose-Einstein correlations of like-sign charged hadrons produced in deep-inelastic electron and positron scattering are studied in the HERMES experiment using nuclear targets of $^1$H, $^2$H, $^3$He, $^4$He, N, Ne, Kr, and Xe. A Gaussian approach is used to parametrize a two-particle correlation function determined from events with at least two charged hadrons of the same sign charge. This correlation function is compared to two different empirical distributions that do not include the Bose-Einstein correlations. One distribution is derived from unlike-sign hadron pairs, and the second is derived from mixing like-sign pairs from different events. The extraction procedure used simulations incorporating the experimental setup in order to correct the results for spectrometer acceptance effects, and was tested using the distribution of unlike-sign hadron pairs. Clear signals of Bose-Einstein correlations for all target nuclei without a significant variation with the nuclear target mass are found. Also, no evidence for a dependence on the invariant mass W of the photon-nucleon system is found when the results are compared to those of previous experiments.

Published
2015

6. 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
High Energy Physics - Experiment
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
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7. Spin density matrix elements in exclusive $\omega$ electroproduction on $^1$H and $^2$H targets at 27.5 GeV beam energy

Author

The HERMES Collaboration, Airapetian, A., Akopov, N., Akopov, Z., 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, A., Reimer, P. E., Reolon, A. R., Riedl, C., Rith, K., Rostomyan, A., Ryckbosch, D., Schäfer, A., Schnell, G., 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
High Energy Physics - Experiment, High Energy Physics - Phenomenology
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 < 6.3 GeV, and -t'< 0.2 GeV$^2$. Results on the angular distribution of the $\omega$ meson, including its decay products, are presented. The data were accumulated with the HERMES forward spectrometer during the 1996-2007 running period using the 27.6 GeV longitudinally polarized electron or positron beam of HERA. The determination of the virtual-photon longitudinal-to-transverse cross-section ratio reveals that a considerable part of the cross section arises from transversely polarized photons. Spin density matrix elements are presented in projections of Q$^2$ or -t'. Violation of s-channel helicity conservation is observed for some of these elements. A sizable contribution from unnatural-parity-exchange amplitudes is found and the phase shift between those amplitudes that describe transverse $\omega$ production by longitudinal and transverse virtual photons, $\gamma^{*}_{L} \to \omega_{T}$ and $\gamma^{*}_{T} \to \omega_{T}$, is determined for the first time. A hierarchy of helicity amplitudes is established, which mainly means that the unnatural-parity-exchange amplitude describing the $\gamma^*_T \to \omega_T$ transition dominates over the two natural-parity-exchange amplitudes describing the $\gamma^*_L \to \omega_L$ and $\gamma^*_T \to \omega_T$ transitions, with the latter two being of similar magnitude. Good agreement is found between the HERMES proton data and results of a pQCD-inspired phenomenological model that includes pion-pole contributions, which are of unnatural parity., Comment: "Erratum version", e.g., includes the corrected version of Figure 6, to be published in "Erratum to: Spin density matrix elements in exclusive omega electroproduction on 1H and 2H targets at 27.5 GeV beam energy". Three SDMEs were mislabeled in the figure of the previously published version [EPJC74(2014)3110]. The labels have been fixed, while none of the results or conclusions changed

Published
2014

8. Transverse polarization of $\Lambda$ hyperons from quasireal photoproduction on nuclei

Author

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

Subjects
High Energy Physics - Experiment, Nuclear Experiment
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
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9. Reevaluation of the parton distribution of strange quarks in the nucleon

Author

The HERMES Collaboration, Airapetian, A., Akopov, N., Akopov, Z., Aschenauer, E. C., Augustyniak, W., Avetissian, A., Avetisyan, E., Belostotski, S., Blok, H. P., Borissov, A., Bryzgalov, V., Burns, J., 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., Felawka, L., Frullani, S., Gabbert, D., Gapienko, G., Gapienko, V., García, J. Garay, Garibaldi, F., Gavrilov, G., Gharibyan, V., Giordano, F., Gliske, S., Hartig, M., Hasch, D., Hoek, M., Holler, Y., Hristova, I., 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., 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., Stinzing, F., Taroian, S., Terkulov, A., Truty, R., Trzcinski, A., Tytgat, M., Van Haarlem, Y., Van Hulse, C., Veretennikov, D., Vikhrov, V., Vilardi, I., Vogel, C., Wang, S., Yaschenko, S., Ye, Z., Yen, S., Zihlmann, B., and Zupranski, P.

Subjects
High Energy Physics - Experiment, High Energy Physics - Phenomenology
Abstract

An earlier extraction from the HERMES experiment of the polarization-averaged parton distribution of strange quarks in the nucleon has been reevaluated using final data on the multiplicities of charged kaons in semi-inclusive deep-inelastic scattering obtained with a kinematically more comprehensive method of correcting for experimental effects. General features of the distribution are confirmed, but the rise at low x is less pronounced than previously reported.

Published
2013
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10. Transverse target single-spin asymmetry in inclusive electroproduction of charged pions and kaons

Author

The HERMES Collaboration, Airapetian, A., Akopov, N., Akopov, Z., Aschenauer, E. C., Augustyniak, W., Avakian, R., Avetissian, A., Avetisyan, E., Belostotski, S., Bianchi, N., Blok, H. P., Borissov, A., Bowles, J., Bryzgalov, V., Burns, J., Capiluppi, M., Capitani, G. P., Cisbani, E., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Deconinck, W., De Leo, R., De Nardo, L., De Sanctis, E., Diefenthaler, M., Di Nezza, P., Düren, M., Ehrenfried, M., Elbakian, G., Ellinghaus, F., Fabbri, R., Fantoni, A., Felawka, L., Frullani, S., Gabbert, D., Gapienko, G., Gapienko, V., Gavrilov, G., Gharibyan, V., Giordano, F., Gliske, S., Golembiovskaya, M., Hadjidakis, C., Hartig, M., Hasch, D., Hillenbrand, A., Hoek, M., 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., Ruiz, A. López, Lorenzon, W., Ma, B. -Q., Mahon, D., Makins, N. C. R., Manaenkov, S. I., Mao, Y., Marianski, B., de la Ossa, A. Martinez, Marukyan, H., Miller, C. A., Miyachi, Y., Movsisyan, A., Muccifora, V., Murray, M., Mussgiller, A., Nappi, E., Naryshkin, Y., Nass, A., Negodaev, M., Nowak, W. -D., Pappalardo, L. L., Perez-Benito, R., Petrosyan, A., Raithel, M., Reimer, P. E., Reolon, A. R., Riedl, C., Rith, K., Rosner, G., Rostomyan, A., Rubin, J., Ryckbosch, D., Salomatin, Y., Sanftl, F., Schäfer, A., Schnell, G., Seitz, B., Shibata, T. -A., Shutov, V., Stancari, 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., Veretennikov, D., Vikhrov, V., Vilardi, I., Wang, S., Yaschenko, S., Ye, Z., Yen, S., Yu, W., Zagrebelnyy, V., Zeiler, D., Zihlmann, B., and Zupranski, P.

Subjects
High Energy Physics - Experiment, Nuclear Experiment
Abstract

Single-spin asymmetries were investigated in inclusive electroproduction of charged pions and kaons from transversely polarized protons at the HERMES experiment. The asymmetries were studied as a function of the azimuthal angle $\psi$ about the beam direction between the target-spin direction and the hadron production plane, the transverse hadron momentum relative to the direction of the incident beam, and the Feynman variable $x_F$. The $\sin(\psi)$ amplitudes are positive for positive pions and kaons, slightly negative for negative pions and consistent with zero for negative kaons, with particular transverse-momentum but weak $x_F$ dependences. Especially large asymmetries are observed for two small subsamples of events, where also the scattered electron was recorded by the spectrometer., Comment: 10 pages, 5 figures

Published
2013

11. 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
High Energy Physics - Experiment, Nuclear Experiment
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
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12. Multiplicities of charged pions and kaons from semi-inclusive deep-inelastic scattering by the proton and the deuteron

Author

HERMES Collaboration, Airapetian, A., Akopov, N., Akopov, Z., Aschenauer, E. C., Augustyniak, W., Avakian, R., Avetissian, A., Avetisyan, E., Belostotski, S., Blok, H. P., Borissov, A., Bowles, J., Brodski, I., Bryzgalov, V., Burns, J., Capiluppi, M., Capitani, G. P., Cisbani, E., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Deconinck, W., De Leo, R., De Nardo, L., De Sanctis, E., Diefenthaler, M., Di Nezza, P., Düren, M., Ehrenfried, M., Elbakian, G., Ellinghaus, F., Fabbri, R., Fantoni, A., Felawka, L., Frullani, S., Gabbert, D., Gapienko, G., Gapienko, V., Garibaldi, F., Gavrilov, G., Gharibyan, V., Giordano, F., Gliske, S., Golembiovskaya, M., Hadjidakis, C., Hartig, M., Hasch, D., Hillenbrand, A., Hoek, M., Holler, Y., Hristova, I., Imazu, Y., Ivanilov, A., Izotov, A., Jackson, H. E., Jo, H. S., Joosten, S., Kaiser, R., Karyan, G., Keri, T., Kinney, E., Kisselev, A., Kobayashi, N., Korotkov, V., Kozlov, V., Kravchenko, P., Krivokhijine, V. G., Lagamba, L., Lapikás, L., Lehmann, I., Lenisa, P., Ruiz, A. López, Lorenzon, W., Ma, B. -Q., Mahon, D., Maiheu, B., Makins, N. C. R., Manaenkov, S. I., Manfré, L., Mao, Y., Marianski, B., de la Ossa, A. Martinez, Marukyan, H., Miller, C. A., Miyachi, Y., Movsisyan, A., Murray, M., Mussgiller, A., Nappi, E., Naryshkin, Y., Nass, A., Negodaev, M., Nowak, W. -D., Pappalardo, L. L., Perez-Benito, R., Petrosyan, A., Raithel, M., Reimer, P. E., Reolon, A. R., Riedl, C., Rith, K., Rosner, G., Rostomyan, A., Rubin, J., Ryckbosch, D., Salomatin, Y., Sanftl, F., Schäfer, A., Schnell, G., Seitz, B., Shibata, T. -A., Shutov, V., Stancari, 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., Veretennikov, D., Vilardi, I., Vogel, C., Wang, S., Yaschenko, S., Ye, Z., Yen, S., Yu, W., Zagrebelnyy, V., Zeiler, D., Zihlmann, B., and Zupranski, P.

Subjects
High Energy Physics - Experiment, Nuclear Experiment
Abstract

Multiplicities in semi-inclusive deep-inelastic scattering are presented for each charge state of \pi^\pm and K^\pm 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_B, Q^2, z, and P_h\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
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13. Beam-helicity asymmetry arising from deeply virtual Compton scattering measured with kinematically complete event reconstruction

Author

The HERMES Collaboration, Airapetian, A., Akopov, N., Akopov, Z., Aschenauer, E. C., Augustyniak, W., Avakian, R., Avetissian, A., Avetisyan, E., Belostotski, S., Blok, H. P., Borissov, A., Bowles, J., Brodski, I., Bryzgalov, V., Burns, J., Capiluppi, M., Capitani, G. P., Cisbani, E., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Deconinck, W., De Leo, R., De Nardo, L., De Sanctis, E., Diefenthaler, M., Di Nezza, P., Düren, M., Ehrenfried, M., Elbakian, G., Ellinghaus, F., Etzelmüller, E., Fabbri, R., Fantoni, A., Felawka, L., Frullani, S., Gapienko, G., Gapienko, V., Garibaldi, F., Gavrilov, G., Gharibyan, V., Giordano, F., Gliske, S., Golembiovskaya, M., Gregor, I. M., Guler, H., Hartig, M., Hasch, D., Hillenbrand, A., Hoek, M., Holler, Y., Hristova, I., Ivanilov, A., Jackson, H. E., Jo, H. S., Joosten, S., Kaiser, R., Karyan, G., Keri, T., Kinney, E., Kisselev, A., Korotkov, V., Kozlov, V., Krauss, B., Kravchenko, P., Krivokhijine, V. G., Lagamba, L., Lapikás, L., Lehmann, I., Lenisa, P., Ruiz, A. López, Lorenzon, W., Lu, S., Lu, X., Ma, B. -Q., Mahon, D., Makins, N. C. R., Manaenkov, S. I., Manfré, L., Mao, Y., Marianski, B., de la Ossa, A. Martinez, Marukyan, H., Miller, C. A., Miyachi, Y., Movsisyan, A., Murray, M., Mussgiller, A., Nappi, E., Naryshkin, Y., Nass, A., Negodaev, M., Nowak, W. -D., Osborne, A., Pappalardo, L. L., Perez-Benito, R., Petrosyan, A., Reimer, P. E., Reolon, A. R., Riedl, C., Rith, K., Rosner, G., Rostomyan, A., Rubacek, L., Rubin, J., Ryckbosch, D., Schäfer, A., Schnell, G., Schüler, K. P., Seitz, B., Shearer, C., Shibata, T. -A., Shutov, V., Stancari, M., Statera, M., Steijger, J. J. M., Stewart, J., 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, Z., Yen, S., Zagrebelnyy, V., Zeiler, D., Zihlmann, B., and Zupranski, P.

Subjects
High Energy Physics - Experiment
Abstract

The beam-helicity asymmetry in exclusive electroproduction of real photons by the longitudinally polarized HERA positron beam scattering off an unpolarized hydrogen target is measured at HERMES. The asymmetry arises from deeply virtual Compton scattering and its interference with the Bethe--Heitler process. Azimuthal amplitudes of the beam-helicity asymmetry are extracted from a data sample consisting of $ep\rightarrow ep\gamma$ events with detection of all particles in the final state including the recoiling proton. The installation of a recoil detector, while reducing the acceptance of the experiment, allows the elimination of background from $ep\rightarrow eN\pi\gamma$ events, which was estimated to contribute an average of about 12% to the signal in previous HERMES publications. The removal of this background from the present data sample is shown to increase the magnitude of the leading asymmetry amplitude by 0.054 +/- 0.016 to -0.328 +/- 0.027 (stat.) +/- 0.045 (syst.).

Published
2012
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14. Azimuthal distributions of charged hadrons, pions, and kaons produced in deep-inelastic scattering off unpolarized protons and deuterons

Author

HERMES Collaboration, Airapetian, A., Akopov, N., Akopov, Z., Aschenauer, E. C., Augustyniak, W., Avakian, R., Avetissian, A., Avetisyan, E., Belostotski, S., Blok, H. P., Borissov, A., Bowles, J., Bryzgalov, V., Burns, J., Capiluppi, M., Capitani, G. P., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Deconinck, W., De Leo, R., De Nardo, L., De Sanctis, E., Diefenthaler, M., Di Nezza, P., Düren, M., Elbakian, G., Ellinghaus, F., Fantoni, A., Felawka, L., Frullani, S., Gapienko, G., Gapienko, V., Garibaldi, F., Gavrilov, G., Gharibyan, V., Giordano, F., Gliske, S., Golembiovskaya, M., Hadjidakis, C., Hartig, M., Hasch, D., Hillenbrand, A., Hoek, M., Holler, Y., Hristova, I., Imazu, Y., Ivanilov, A., Jackson, H. E., Jo, H. S., 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., Ruiz, A. López, Lorenzon, W., Ma, B. -Q., Mahon, D., Makins, N. C. R., Manaenkov, S. I., Manfré, L., Mao, Y., Marianski, B., de la Ossa, A. Martinez, Marukyan, H., Miller, C. A., Miyachi, Y., Movsisyan, A., Murray, M., Nappi, E., Naryshkin, Y., Nass, A., Negodaev, M., Nowak, W. -D., Pappalardo, L. L., Perez-Benito, R., Petrosyan, A., Raithel, M., Reimer, P. E., Reolon, A. R., Riedl, C., Rith, K., Rosner, G., Rostomyan, A., Rubin, J., Ryckbosch, D., Salomatin, Y., Sanftl, F., Schäfer, A., Schnell, G., Schüler, K. P., Seitz, B., Shibata, T. -A., Stancari, M., Statera, M., Steijger, J. J. M., Stewart, J., Stinzing, F., Terkulov, A., Truty, R., Trzcinski, A., Tytgat, M., Vandenbroucke, A., Van Haarlem, Y., Van Hulse, C., Veretennikov, D., Vikhrov, V., Vilardi, I., Wang, S., Yaschenko, S., Ye, Z., Yen, S., Yu, W., Zagrebelnyy, V., Zeiler, D., Zihlmann, B., and Zupranski, P.

Subjects
High Energy Physics - Experiment, Nuclear Experiment
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
2012
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15. Beam-helicity and beam-charge asymmetries associated with deeply virtual Compton scattering on the unpolarised proton

Author

The HERMES Collaboration, Airapetian, A., Akopov, N., Akopov, Z., Aschenauer, E. C., Augustyniak, W., Avakian, R., Avetissian, A., Avetisyan, E., Blok, H. P., Borissov, A., Bowles, J., Bryzgalov, V., Burns, J., Capiluppi, M., Capitani, G. P., Cisbani, E., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Deconinck, W., De Leo, R., De Nardo, L., De Sanctis, E., Diefenthaler, M., Di Nezza, P., Düren, M., Ehrenfried, M., Elbakian, G., Ellinghaus, F., Fantoni, A., Felawka, L., Frullani, S., Gabbert, D., Gapienko, G., Gapienko, V., Garibaldi, F., Gavrilov, G., Giordano, F., Gliske, S., Golembiovskaya, M., Hadjidakis, C., Hartig, M., Hasch, D., Hoek, M., Holler, Y., Imazu, Y., Jackson, H. E., Jo, H. S., Kaiser, R., Karyan, G., Keri, T., Kinney, E., Kisselev, A., Kobayashi, N., Korotkov, V., Kozlov, V., Kravchenko, P., Krivokhijine, V. G., Lagamba, L., Lapikás, L., Lehmann, I., Lenisa, P., Lorenzon, W., Ma, B. -Q., Mahon, D., Makins, N. C. R., Manaenkov, S. I., Manfré, L., Mao, Y., Marianski, B., de la Ossa, A. Martinez, Marukyan, H., Miller, C. A., Miyachi, Y., Movsisyan, A., Muccifora, V., Murray, M., Mussgiller, A., Nappi, E., Naryshkin, Y., Nass, A., Nowak, W. -D., Pappalardo, L. L., Perez-Benito, R., Petrosyan, A., Raithel, M., Reimer, P. E., Reolon, A. R., Riedl, C., Rith, K., Rosner, G., Rostomyan, A., Rubin, J., Ryckbosch, D., Salomatin, Y., Sanftl, F., Schäfer, A., Schnell, G., Schüler, K. P., Seitz, B., Shibata, T. -A., Shutov, V., Stancari, M., Statera, M., Steffens, E., Steijger, J. J. M., Stewart, J., 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, Z., Yen, S., Yu, W., Zagrebelnyy, V., Zeiler, D., Zihlmann, B., and Zupranski, P.

Subjects
High Energy Physics - Experiment
Abstract

Beam-helicity and beam-charge asymmetries in the hard exclusive leptoproduction of real photons from an unpolarised hydrogen target by a 27.6 GeV lepton beam are extracted from the HERMES data set of 2006-2007 using a missing-mass event selection technique. The asymmetry amplitudes extracted from this data set are more precise than those extracted from the earlier data set of 1996-2005 previously analysed in the same manner by HERMES. The results from the two data sets are compatible with each other. Results from these combined data sets are extracted and constitute the most precise asymmetry amplitude measurements made in the HERMES kinematic region using a missing-mass event selection technique., Comment: (minor changes only compared to arXiv version 1)

Published
2012
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16. Measurement of the virtual-photon asymmetry A2 and the spin-structure function g2 of the proton

Author

The HERMES Collaboration, Airapetian, A., Akopov, N., Akopov, Z., Aschenauer, E. C., Augustyniak, W., Avakian, R., Avetissian, A., Avetisyan, E., Belostotski, S., Bianchi, N., Blok, H. P., Borissov, A., Bowles, J., Bryzgalov, V., Burns, J., Capiluppi, M., Capitani, G. P., Cisbani, E., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Deconinck, W., De Leo, R., De Nardo, L., De Sanctis, E., Diefenthaler, M., Di Nezza, P., Düren, M., Ehrenfried, M., Elbakian, G., Ellinghaus, F., Fantoni, A., Felawka, L., Frullani, S., Gabbert, D., Gapienko, G., Gapienko, V., Garibaldi, F., Gavrilov, G., Gharibyan, V., Giordano, F., Gliske, S., Golembiovskaya, M., Hadjidakis, C., Hartig, M., Hasch, D., Hillenbrand, A., Hoek, M., Holler, Y., Hristova, I., Imazu, Y., Ivanilov, A., Jackson, H. E., Jo, H. S., 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., Ruiz, A. López, Lorenzon, W., Ma, B. -Q., Mahon, D., Makins, N. C. R., Manaenkov, S. I., Manfré, L., Mao, Y., Marianski, B., de la Ossa, A. Martinez, Marukyan, H., Miller, C. A., Miyachi, Y., Movsisyan, A., Muccifora, V., Murray, M., Mussgiller, A., Nappi, E., 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., Sanftl, F., Schäfer, A., Schnell, G., Schüler, K. P., Seitz, B., Shibata, T. -A., Shutov, V., Stancari, M., Statera, M., Steffens, E., Steijger, J. J. M., Stewart, J., Stinzing, F., Taroian, S., Terkulov, A., Truty, R., Trzcinski, A., Tytgat, M., Vandenbroucke, A., Van Haarlem, Y., Van Hulse, C., Veretennikov, D., Vikhrov, V., Vilardi, I., Wang, S., Yaschenko, S., Ye, Z., Yen, S., Zagrebelnyy, V., Zeiler, D., Zihlmann, B., and Zupranski, P.

Subjects
High Energy Physics - Experiment
Abstract

A measurement of the virtual-photon asymmetry A_2(x,Q^2) and of the spin-structure function g_2(x,Q^2) of the proton are presented for the kinematic range 0.004 < x < 0.9 and 0.18 GeV^2 < Q^2 < 20 GeV^2. The data were collected by the HERMES experiment at the HERA storage ring at DESY while studying inclusive deep-inelastic scattering of 27.6 GeV longitudinally polarized leptons off a transversely polarized hydrogen gas target. The results are consistent with previous experimental data from CERN and SLAC. For the x-range covered, the measured integral of g_2(x) converges to the null result of the Burkhardt-Cottingham sum rule. The x^2 moment of the twist-3 contribution to g_2(x) is found to be compatible with zero.

Published
2011
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17. Multidimensional Study of Hadronization in Nuclei

Author

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

Subjects
High Energy Physics - Experiment
Abstract

Hadron multiplicities in semi-inclusive deep-inelastic scattering were measured on neon, krypton and xenon targets relative to deuterium at an electron(positron)-beam energy of 27.6 GeV at HERMES. These ratios were determined as a function of the virtual-photon energy nu, its virtuality Q2, the fractional hadron energy z and the transverse hadron momentum with respect to the virtual-photon direction pt . Dependences were analysed separately for positively and negatively charged pions and kaons as well as protons and antiprotons in a two-dimensional representation. Compared to the one-dimensional dependences, some new features were observed. In particular, when z > 0.4 positive kaons do not show the strong monotonic rise of the multiplicity ratio with nu as exhibited by pions and negative kaons. Protons were found to behave very differently from the other hadrons.

Published
2011
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18. Measurement of double-spin asymmetries associated with deeply virtual Compton scattering on a transversely polarized hydrogen target

Author

The HERMES Collaboration, Airapetian, A., Akopov, N., Akopov, Z., Aschenauer, E. C., Augustyniak, W., Avakian, R., Avetissian, A., Avetisyan, E., Belostotski, S., Bianchi, N., Blok, H. P., Borissov, A., Bowles, J., Brodski, I., Bryzgalov, V., Burns, J., Capiluppi, M., Capitani, G. P., Cisbani, E., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Deconinck, W., De Leo, R., De Nardo, L., De Sanctis, E., Di Nezza, P., Dueren, M., Ehrenfried, M., Elbakian, G., Ellinghaus, F., Fabbri, R., Fantoni, A., Felawka, L., Frullani, S., Gabbert, D., Gapienko, G., Gapienko, V., Garibaldi, F., Gavrilov, G., Gharibyan, V., Giordano, F., Gliske, S., Golembiovskaya, M., Hartig, M., Hasch, D., Hoek, M., Holler, Y., Hristova, I., Imazu, Y., Ivanilov, A., Jackson, H. E., Jo, H. S., Joosten, S., Kaiser, R., Karyan, G., Keri, T., Kinney, E., Kisselev, A., Korotkov, V., Kozlov, V., Kravchenko, P., Krivokhijine, V. G., Lagamba, L., Lapikas, L., Lehmann, I., Lenisa, P., Ruiz, A. Lopez, Lorenzon, W., Lu, X. -G., Lu, X. -R., Ma, B. -Q., Mahon, D., Makins, N. C. R., Manaenkov, S. I., Manfre, L., Mao, Y., de la Ossa, B. Marianski A. Martinez, Marukyan, H., Miller, C. A., Miyachi, Y., Movsisyan, A., Murray, M., Mussgiller, A., Nappi, E., Naryshkin, Y., Nass, A., Negodaev, M., Nowak, W. -D., Pappalardo, L. L., Perez-Benito, R., Raithel, M., Reimer, P. E., Reolon, A. R., Riedl, C., Rith, K., Rosner, G., Rostomyan, A., Rubin, J., Ryckbosch, D., Salomatin, Y., Schaefer, A., Schnell, G., Schueler, K. P., Seitz, B., Shibata, T. -A., Shutov, V., Stancari, M., Statera, M., Steffens, E., Steijger, J. J. M., Stinzing, F., 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, Z., Yen, S., Zagrebelnyy, V., Zeiler, D., Zihlmann, B., and Zupranski, P.

Subjects
High Energy Physics - Experiment
Abstract

Double-spin asymmetries in exclusive electroproduction of real photons from a transversely polarized hydrogen target are measured with respect to the product of target polarization with beam helicity and beam charge, and with respect to the product of target polarization with beam helicity alone. The asymmetries arise from the deeply virtual Compton scattering process and its interference with the Bethe--Heitler process. They are related to the real part of the same combination of Compton form factors as that determining the previously published transverse target single-spin asymmetries through the imaginary part. The results for the double-spin asymmetries are found to be compatible with zero within the uncertainties of the measurement, and are not incompatible with the predictions of the only available GPD-based calculation., Comment: 9 pages, 4 figures, and 3 tables

Published
2011
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19. Transverse-target-spin asymmetry in exclusive ω -meson electroproduction: The HERMES Collaboration

Author

Airapetian, A., Akopov, N., Akopov, Z., Aschenauer, E. C., Augustyniak, W., Avetissian, A., Belostotski, S., Blok, H. P., Borissov, A., Bryzgalov, V., Capitani, G. P., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Deconinck, W., De Leo, R., De Sanctis, E., Diefenthaler, M., Di Nezza, P., Düren, M., Elbakian, G., Ellinghaus, F., Felawka, L., Frullani, S., Gabbert, D., Gapienko, G., Gapienko, V., Gharibyan, V., Giordano, F., Gliske, S., Hasch, D., Hoek, M., Holler, Y., Ivanilov, A., Jackson, H. E., Joosten, S., Kaiser, R., Karyan, G., Keri, T., Kinney, E., Kisselev, A., Korotkov, V., Kozlov, V., Krivokhijine, V. G., Lagamba, L., Lapikás, L., Lehmann, I., Lenisa, P., Lorenzon, W., Ma, B.-Q., Manaenkov, S. I., Mao, Y., Marianski, B., Marukyan, H., Miyachi, Y., Movsisyan, A., Muccifora, V., 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., Schnell, G., Seitz, B., Shibata, T.-A., Statera, M., Steffens, E., Steijger, J. J. M., Stinzing, F., Taroian, S., Terkulov, A., Truty, R., Trzcinski, A., Tytgat, M., Van Haarlem, Y., Van Hulse, C., Vikhrov, V., Vilardi, I., Vogel, C., Wang, S., Yaschenko, S., Yen, S., Zihlmann, B., and Zupranski, P.

Published
2015
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20. Bose–Einstein correlations in hadron-pairs from lepto-production on nuclei ranging from hydrogen to xenon: HERMES Collaboration

Author

Airapetian, A., Akopov, N., Akopov, Z., Aschenauer, E. C., Augustyniak, W., Avakian, R., Avetissian, A., Avetisyan, E., Belostotski, S., Bianchi, N., Blok, H. P., Borissov, A., Bryzgalov, V., Burns, J., 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., Elbakian, G., Ellinghaus, F., Etzelmüller, E., Fabbri, R., Fantoni, A., Felawka, L., Frullani, S., Gapienko, G., Gapienko, V., Garay García, J., Garibaldi, F., Gavrilov, G., Gharibyan, V., 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., Korotkov, V., Kozlov, V., Kravchenko, P., Krivokhijine, V. G., Lagamba, L., Lapikás, L., Lehmann, I., Lenisa, P., López Ruiz, A., Lorenzon, W., Lu, X.-G., Ma, B.-Q., Mahon, D., Makins, N. C. R., Mao, Y., Marianski, B., Martinez de la Ossa, A., Marukyan, H., Miyachi, Y., Movsisyan, A., Murray, M., Mussgiller, A., Nappi, E., 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., Shutov, V., Stahl, M., Stancari, M., Statera, 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, Z., Yen, S., Zihlmann, B., and Zupranski, P.

Published
2015
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21. Spin density matrix elements in exclusive 2 H targets at 27.5 GeV beam energy

Author

Airapetian, A., Akopov, N., Akopov, Z., 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, A., Reimer, P. E., Reolon, A. R., Riedl, C., Rith, K., Rostomyan, A., Ryckbosch, D., Schäfer, A., Schnell, G., 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., Zupranski, P., and The HERMES Collaboration

Published
2014
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23. Erratum to: Spin density matrix elements in exclusive 2 H targets at 27.5 GeV beam energy: The HERMES Collaboration

Author

Airapetian, A., Akopov, N., Akopov, Z., 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, A., Reimer, P. E., Reolon, A. R., Riedl, C., Rith, K., Rostomyan, A., Ryckbosch, D., Schäfer, A., Schnell, G., 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.

Published
2016
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24. Longitudinal double-spin asymmetries in semi-inclusive deep-inelastic scattering of electrons and positrons by protons and deuterons

Author

Airapetian, A., Akopov, N., Akopov, Z., Aschenauer, E. C., Augustyniak, W., Avakian, R., Avetissian, A., Belostotski, S., Blok, H. P., Borissov, A., Bryzgalov, V., Capitani, G. P., Cisbani, E., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Deconinck, W., De Leo, R., De Nardo, L., De Sanctis, E., Diefenthaler, M., Di Nezza, P., Düren, M., Elbakian, G., Ellinghaus, F., Fantoni, A., Felawka, L., Frullani, S., Gavrilov, G., Gharibyan, V., Giordano, F., Gliske, S., Hasch, D., Holler, Y., 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., Lorenzon, W., Ma, B.-Q., Mahon, D., Manaenkov, S. I., Mao, Y., Marianski, B., Marukyan, H., Miyachi, Y., Movsisyan, A., Muccifora, V., Mussgiller, A., Naryshkin, Y., Nass, A., Nazaryan, G., Nowak, W.-D., Pappalardo, L. L., Perez-Benito, R., Petrosyan, Anush, Reimer, P. E., Reolon, A. R., Riedl, C., Rith, K., Rosner, G., Rostomyan, A., Rubin, J., Ryckbosch, D., Salomatin, Y., Schnell, G., Seitz, B., Shibata, T.-A., Statera, M., Steffens, E., Steijger, J. J. M., Taroian, S., Terkulov, A., Truty, R., Trzcinski, A., Tytgat, M., Van Der Nat, P. B., Van Haarlem, Y., Van Hulse, C., Veretennikov, D., Vikhrov, V., Vilardi, I., Vogel, Christian, Wang, S., Yaschenko, S., Zihlmann, B., and Zupranski, P.

Abstract

Physical review / D 99(11), 112001 (2019). doi:10.1103/PhysRevD.99.112001, A comprehensive collection of results on longitudinal double-spin asymmetries is presented for charged pions and kaons produced in semi-inclusive deep-inelastic scattering of electrons and positrons on the proton and deuteron, based on the full HERMES data set. The dependence of the asymmetries on hadron transverse momentum and azimuthal angle extends the sensitivity to the flavor structure of the nucleon beyond the distribution functions accessible in the collinear framework. No strong dependence on those variables is observed. In addition, the hadron charge-difference asymmetry is presented, which under certain model assumptions provides access to the helicity distributions of valence quarks., Published by APS, College Park, MD

Published
2019
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25. BRCA Challenge: BRCA Exchange as a global resource for variants in BRCA1 and BRCA2

Author

Cline, M.S., Liao, R.G., Parsons, M.T., Paten, B., Alquaddoomi, F., Antoniou, A., Baxter, S., Brody, L., Cook-Deegan, R., Coffin, A., Couch, F.J., Craft, B., Currie, R., Dlott, C.C., Dolman, L., Dunnen, J.T. den, Dyke, S.O.M., Domchek, S.M., Easton, D., Fischmann, Z., Foulkes, W.D., Garber, J., Goldgar, D., Goldman, M.J., Goodhand, P., Harrison, S., Haussler, D., Kato, K., Knoppers, B., Markello, C., Nussbaum, R., Offit, K., Plon, S.E., Rashbass, J., Rehm, H.L., Robson, M., Rubinstein, W.S., Stoppa-Lyonnet, D., Tavtigian, S., Thorogood, A., Zhang, C., Zimmermann, M., Burn, J., Chanock, S., Ratsch, G., Spurdle, A.B., Andreoletti, G., Baker, D., Brenner, S., Brush, M., Caputo, S., Castera, L., Cunningham, F., Hoya, M. de la, Diekhans, M., Dolinsky, J., Dwight, S., Eccles, D., Feng, B., Fiume, M., Flicek, P., Gaudet, P., Garcia, E.G., Haendel, M., Haeussler, M., Hahnen, E., Houdayer, C., Hunt, S., James, P., Lebo, M., Lee, J., Lerner-Ellis, J., Lin, M., Lincoln, S., Malheiro, A., Mesenkamp, A., Monteiro, A., Natzijl-Visser, E., Ngeow, J., North, K., Parkinson, H., Paschall, J., Patrinos, G., Phimister, B., Radice, P., Rainville, I., Rasmussen, M., Riley, G., Rouleau, E., Schmutzler, R., Shefchek, K., Sofia, H., Southey, M., Stuart, J., Thomas, J., Toland, A., Truty, R., Turn-Bull, C., Vaur, D., Vreeswijk, M.P.G., Walker, L., Walsh, M., Wappenschmidt, B., Weitzel, J., Wright, M., Zalunin, V., Zaranek, A., Zerbino, D., Zhou, A., Zhou, J., Zook, J., BRCA Challenge Authors, Eng, Charis, Liao, Rachel G [0000-0002-7830-1976], Parsons, Michael T [0000-0003-3242-8477], Alquaddoomi, Faisal [0000-0003-4297-8747], Baxter, Samantha [0000-0003-4616-9234], Coffin, Amy [0000-0003-2723-8222], Currie, Robert [0000-0003-1828-1827], Dlott, Chloe C [0000-0002-7268-7230], Dolman, Lena [0000-0002-3938-588X], Fischmann, Zachary [0000-0002-7687-0972], Foulkes, William D [0000-0001-7427-4651], Goldman, Mary J [0000-0002-9808-6388], Goodhand, Peter [0000-0002-2624-2820], Harrison, Steven [0000-0002-9614-9111], Haussler, David [0000-0003-1533-4575], Markello, Charles [0000-0002-3653-7155], Plon, Sharon E [0000-0002-9626-0936], Rehm, Heidi L [0000-0002-6025-0015], Rubinstein, Wendy S [0000-0002-8790-9959], Tavtigian, Sean [0000-0002-7543-8221], Thorogood, Adrian [0000-0001-5078-8164], Chanock, Stephen [0000-0002-2324-3393], Rätsch, Gunnar [0000-0001-5486-8532], Spurdle, Amanda B [0000-0003-1337-7897], and Apollo - University of Cambridge Repository

Subjects
0301 basic medicine, Male, Cancer Research, Research Facilities, endocrine system diseases, Epidemiology, Genes, BRCA2, Genes, BRCA1, Social Sciences, Penetrance, QH426-470, Patient advocacy, Database and Informatics Methods, 0302 clinical medicine, Resource (project management), Sociology, Gene Frequency, Consortia, Risk Factors, Databases, Genetic, Medicine and Health Sciences, Aetiology, skin and connective tissue diseases, Genetics (clinical), Cancer, Ovarian Neoplasms, education.field_of_study, Cancer Risk Factors, Genomics, Genomic Databases, 3. Good health, Viewpoints, Phenotype, Oncology, 030220 oncology & carcinogenesis, Female, Research Laboratories, Population, Genetic Causes of Cancer, MEDLINE, Information Dissemination, Breast Neoplasms, Patient Advocacy, Biology, Research and Analysis Methods, Human Genomics, 03 medical and health sciences, Databases, Genetic, Breast Cancer, Genetics, Humans, Genetic Predisposition to Disease, education, Molecular Biology, Ecology, Evolution, Behavior and Systematics, Alleles, Human Genome, Biology and Life Sciences, Computational Biology, Genetic Variation, Genome Analysis, Genomic Libraries, BRCA1, Data science, BRCA2, Data sharing, Health Care, 030104 developmental biology, Biological Databases, Good Health and Well Being, Genes, Genetic Loci, Medical Risk Factors, BRCA Challenge Authors, Mutation, Leiden Open Variation Database, 2.6 Resources and infrastructure (aetiology), Government Laboratories, Developmental Biology
Abstract

The BRCA Challenge is a long-term data-sharing project initiated within the Global Alliance for Genomics and Health (GA4GH) to aggregate BRCA1 and BRCA2 data to support highly collaborative research activities. Its goal is to generate an informed and current understanding of the impact of genetic variation on cancer risk across the iconic cancer predisposition genes, BRCA1 and BRCA2. Initially, reported variants in BRCA1 and BRCA2 available from public databases were integrated into a single, newly created site, www.brcaexchange.org. The purpose of the BRCA Exchange is to provide the community with a reliable and easily accessible record of variants interpreted for a high-penetrance phenotype. More than 20,000 variants have been aggregated, three times the number found in the next-largest public database at the project’s outset, of which approximately 7,250 have expert classifications. The data set is based on shared information from existing clinical databases—Breast Cancer Information Core (BIC), ClinVar, and the Leiden Open Variation Database (LOVD)—as well as population databases, all linked to a single point of access. The BRCA Challenge has brought together the existing international Evidence-based Network for the Interpretation of Germline Mutant Alleles (ENIGMA) consortium expert panel, along with expert clinicians, diagnosticians, researchers, and database providers, all with a common goal of advancing our understanding of BRCA1 and BRCA2 variation. Ongoing work includes direct contact with national centers with access to BRCA1 and BRCA2 diagnostic data to encourage data sharing, development of methods suitable for extraction of genetic variation at the level of individual laboratory reports, and engagement with participant communities to enable a more comprehensive understanding of the clinical significance of genetic variation in BRCA1 and BRCA2., Author summary The goal of this study and paper has been to develop an international resource to generate an informed and current understanding of the impact of genetic variation on cancer risk across the cancer predisposition genes, BRCA1 and BRCA2. Reported variants in BRCA1 and BRCA2 available from public databases were integrated into a single, newly created site, www.brcaexchange.org, to provide a reliable and easily accessible record of variants interpreted for a high-penetrance phenotype.

Published
2018

26. Longitudinal double-spin asymmetries in semi-inclusive deep-inelastic scattering of electrons and positrons by protons and deuterons

Author

Airapetian, A., Akopov, N., Akopov, Z., Aschenauer, E. C., Augustyniak, W., Avakian, R., Avetissian, A., Belostotski, S., Blok, H. P., Borissov, A., Bryzgalov, V., Capitani, G. P., Cisbani, E., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Deconinck, W., De Leo, R., De Nardo, L., De Sanctis, E., Diefenthaler, M., Di Nezza, P., Düren, M., Elbakian, G., Ellinghaus, F., Fantoni, A., Felawka, L., Frullani, S., Gavrilov, G., Gharibyan, V., Giordano, F., Gliske, S., Hasch, D., Holler, Y., 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., Lorenzon, W., Ma, B. -Q., Mahon, D., Manaenkov, S. I., Mao, Y., Marianski, B., Marukyan, H., Miyachi, Y., Movsisyan, A., Muccifora, V., Mussgiller, A., Naryshkin, Y., Nass, A., Nazaryan, G., 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., Seitz, B., Shibata, T. -A., Statera, M., Steffens, E., Steijger, J. J. M., Taroian, S., Terkulov, A., Truty, R., Trzcinski, A., Tytgat, M., Van Der Nat, P. B., Van Haarlem, Y., Van Hulse, C., Veretennikov, D., Vikhrov, V., Vilardi, I., Vogel, C., Wang, S., Yaschenko, S., Zihlmann, B., and Zupranski, P.

Subjects
Nuclear Theory, High Energy Physics::Experiment, Nuclear Experiment
Abstract

A comprehensive collection of results on longitudinal double-spin asymmetries is presented for charged pions and kaons produced in semi-inclusive deep-inelastic scattering of electrons and positrons on the proton and deuteron, based on the full HERMES data set. The dependence of the asymmetries on hadron transverse momentum and azimuthal angle extends the sensitivity to the flavor structure of the nucleon beyond the distribution functions accessible in the collinear framework. No strong dependence on those variables is observed. In addition, the hadron charge-difference asymmetry is presented, which under certain model assumptions provides access to the helicity distributions of valence quarks.

Published
2018
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27. Ratios of helicity amplitudes for exclusive $\rho^0$ electroproduction on transversely polarized protons

Author

Airapetian, A., Akopov, N., Akopov, Z., Aschenauer, E. C., Augustyniak, W., Belostotski, S., Blok, H. P., Borissov, A., Bryzgalov, V., Capitani, G. P., Ciullo, G., Contalbrigo, M., Deconinck, W., De Leo, R., De Sanctis, E., Düren, M., Elbakian, G., Ellinghaus, F., Felawka, L., Frullani, S., Garibaldi, F., Gavrilov, G., Gharibyan, V., Goloskokov, S. V., Holler, Y., Ivanilov, A., Jackson, H. E., Joosten, S., Kaiser, R., Karyan, G., Kisselev, A., Korotkov, V., Kozlov, V., Kravchenko, P., Kroll, P., Lagamba, L., Lapikás, L., Lehmann, I., Lenisa, P., Lorenzon, W., Manaenkov, S. I., Marianski, B., Marukyan, H., Miyachi, Y., Movsisyan, A., Muccifora, V., Nass, A., Nowak, W. -D., Pappalardo, L. L., Petrosyan, Anush, Reimer, P. E., Reolon, A. R., Riedl, C., Rith, K., Rosner, G., Rostomyan, A., Ryckbosch, D., Salomatin, Y., Schäfer, A., Schnell, G., Seitz, B., Shibata, T. -A., Shutov, V., Statera, M., Terkulov, A., Truty, R., Trzcinski, A., Tytgat, M., Van Haarlem, Y., Van Hulse, C., Veretennikov, D., Vikhrov, V., Vilardi, I., Yaschenko, S., Zihlmann, B., Zupranski, P., and HERMES Collaboration

Subjects
Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Exclusive $\rho^0$-meson electroproduction is studied by the HERMES experiment, using the 27.6 GeV longitudinally polarized electron/positron beam of HERA and a transversely polarized hydrogen target, in the kinematic region 1.0 GeV$^2$

Published
2017
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28. Ratios of helicity amplitudes for exclusive $\rho ^0$ electroproduction on transversely polarized protons

Author

Airapetian, A., Akopov, N., Akopov, Z., Aschenauer, E. C., Augustyniak, W., Belostotski, S., Blok, H. P., Borissov, A., Bryzgalov, V., Capitani, G. P., Ciullo, G., Contalbrigo, M., Deconinck, W., De Leo, R., De Sanctis, E., Düren, M., Elbakian, G., Ellinghaus, F., Felawka, L., Frullani, S., Garibaldi, F., Gavrilov, G., Gharibyan, V., Goloskokov, S. V., Holler, Y., Ivanilov, A., Jackson, H. E., Joosten, S., Kaiser, R., Karyan, G., Kisselev, A., Korotkov, V., Kozlov, V., Kravchenko, P., Kroll, P., Lagamba, L., Lapikás, L., Lehmann, I., Lenisa, P., Lorenzon, W., Manaenkov, S. I., Marianski, B., Marukyan, H., Miyachi, Y., Movsisyan, A., Muccifora, V., Nass, A., Nowak, W.-D., Pappalardo, L. L., Petrosyan, Anush, Reimer, P. E., Reolon, A. R., Riedl, C., Rith, K., Rosner, G., Rostomyan, A., Ryckbosch, D., Salomatin, Y., Schaefer, Andreas, Schnell, G., Seitz, B., Shibata, T.-A., Shutov, V., Statera, M., Terkulov, A., Truty, R., Trzcinski, A., Tytgat, M., Van Haarlem, Y., Van Hulse, C., Veretennikov, D., Vikhrov, V., Vilardi, I., Yaschenko, S., Zihlmann, B., and Zupranski, P.

Abstract

The European physical journal / C 77(6), 378(2017). doi:10.1140/epjc/s10052-017-4899-1, Exclusive $\rho^0$-meson electroproduction is studied by the HERMES experiment, using the 27.6 GeV longitudinally polarized electron/positron beam of HERA and a transversely polarized hydrogen target, in the kinematic region 1.0 GeV$^2$ < Q$^2$ < 7.0 GeV$^2$, 3.0 GeV < W < 6.3 GeV, and -t’ < 0.4 GeV$^2$. Using an unbinned maximum-likelihood method, 25 parameters are extracted. These determine the real and imaginary parts of the ratios of several helicity amplitudes describing $\rho^0$-meson production by a virtual photon. The denominator of those ratios is the dominant amplitude, the nucleon-helicity-non-flip amplitude $F_{0\frac{1}{2}0\frac{1}{2}}$, which describes the production of a longitudinal $\rho^0$-meson by a longitudinal virtual photon. The ratios of nucleon-helicity-non-flip amplitudes are found to be in good agreement with those from the previous HERMES analysis. The transverse target polarization allows for the first time the extraction of ratios of a number of nucleon-helicity-flip amplitudes to $F_{0\frac{1}{2}0\frac{1}{2}}$. Results obtained in a handbag approach based on generalized parton distributions taking into account the contribution from pion exchange are found to be in good agreement with these ratios. Within the model, the data favor a positive sign for the $\pi-\rho$ transition form factor. By also exploiting the longitudinal beam polarization, a total of 71 $\rho^0$ spin-density matrix elements is determined from the extracted 25 parameters, in contrast to only 53 elements as directly determined in earlier analyses., Published by Springer, Berlin

Published
2017
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29. Ratios of helicity amplitudes for exclusive ρ⁰ electroproduction on transversely polarized protons

Author

Airapetian, A, Akopov, N, Akopov, Z, Aschenauer, EC, Augustyniak, W, Belostotski, S, Blok, HP, Borissov, A, Bryzgalov, V, Capitani, GP, Ciullo, G, Contalbrigo, M, Deconinck, W, De Leo, R, De Sanctis, E, Duren, M, Elbakian, G, Ellinghaus, F, Felawka, L, Frullani, S, Garibaldi, F, Gavrilov, G, Gharibyan, V, Goloskokov, SV, Holler, Y, Ivanilov, A, Jackson, HE, Joosten, Sylvester, Kaiser, R, Karyan, G, Kisselev, A, Korotkov, V, Kozlov, V, Kravchenko, P, Kroll, P, Lagamba, L, Lapikas, L, Lehmann, I, Lenisa, P, Lorenzon, W, Manaenkov, SI, Marianski, B, Marukyan, H, Miyachi, Y, Movsisyan, A, Muccifora, V, Nass, A, Nowak, W-D, Pappalardo, LL, Petrosyan, A, Reimer, PE, Reolon, R, Riedl, C, Rith, K, Rosner, G, Rostomyan, A, Ryckbosch, Dirk, Salomatin, Y, Schaefer, A, Schnell, Gunar, Seitz, B, Shibata, T-A, Shutov, V, Statera, M, Terkulov, A, Truty, R, Trzcinski, A, Tytgat, Michael, Van Haarlem, Yves, Van Hulse, Charlotte, Veretennikov, D, Vikhrov, V, Vilardi, I, Yaschenko, S, Zihlmann, B, and Zupranski, P

Subjects
ELASTIC ELECTROPRODUCTION, Physics and Astronomy, J/PSI MESONS, SPIN, LEPTOPRODUCTION, GENERALIZED PARTON DISTRIBUTIONS, HERA, SCATTERING, High Energy Physics::Experiment, HYDROGEN, Nuclear Experiment, CROSS-SECTION, VECTOR-MESON PRODUCTION
Abstract

Exclusive rho(0)-meson electroproduction is studied by the HERMES experiment, using the 27.6 GeV longitudinally polarized electron/positron beam of HERA and a transversely polarized hydrogen target, in the kinematic region 1.0 GeV2 < Q(2) < 7.0GeV(2), 3.0GeV< W < 6.3 GeV, and -t' < 0.4 GeV2. Using an unbinned maximum-likelihood method, 25 parameters are extracted. These determine the real and imaginary parts of the ratios of several helicity amplitudes describing rho(0)-meson production by a virtual photon. The denominator of those ratios is the dominant amplitude, the nucleon-helicity-non-flip amplitude F-0 (1/2 0 1/2), which describes the production of a longitudinal rho(0)-meson by a longitudinal virtual photon. The ratios of nucleon-helicity-nonflip amplitudes are found to be in good agreement with those from the previous HERMES analysis. The transverse target polarization allows for the first time the extraction of ratios of a number of nucleon-helicity-flip amplitudes to F-0 (1/2 0 1/2). Results obtained in a handbag approach based on generalized parton distributions taking into account the contribution from pion exchange are found to be in good agreement with these ratios. Within the model, the data favor a positive sign for the pi - rho transition form factor. By also exploiting the longitudinal beam polarization, a total of 71.0 spin-density matrix elements is determined from the extracted 25 parameters, in contrast to only 53 elements as directly determined in earlier analyses.

Published
2017

31. Abstract P4-06-08: An interlaboratory study of complex mutation detection in genes associated with hereditary breast and ovarian cancer highlights both successes and current challenges

Author

Lincoln, S, primary, Zook, J, additional, Truty, R, additional, Chowdhury, S, additional, Fellowes, A, additional, Mahamdallie, S, additional, Ferber, M, additional, Cleveland, M, additional, Huang, C, additional, Tomson, F, additional, Klee, E, additional, DeSilva, W, additional, Seal, S, additional, Aradhya, S, additional, Nussbaum, R, additional, Garlick, R, additional, Kingsmore, S, additional, Rahman, N, additional, Salit, M, additional, and Shirts, B, additional

Published
2018
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32. Erratum to: Spin density matrix elements in exclusive ω electroproduction on 1H and 2H targets at 27.5 GeV beam energy

Author

Airapetian, A., Akopov, N., Akopov, Z., 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, A., Reimer, P. E., Reolon, A. R., Riedl, C., Rith, K., Rostomyan, A., Ryckbosch, D., Schäfer, A., Schnell, G., 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.

Abstract

No abstract available.

Published
2016

33. Spin density matrix elements in exclusive omega electroproduction on H-1 and H-2 targets at 27.5 GeV beam energy (vol 74, 3110, 2014)

Author

Airapetian, A., Akopov, N., Akopov, Z., Augustyniak, W., Avetissian, A., Blok, H. P., Borissov, A., Bryzgalov, V., Capiluppi, M., Capitani, G. P., Cisbani, E., Ciullo, Giuseppe, Contalbrigo, M., Dalpiaz, P. F., Deconinck, W., De Leo, R., De Sanctis, E., Diefenthaler, M., Di Nezza, P., Dueren, M., Ehrenfried, M., Elbakian, G., Ellinghaus, F., Etzelmueller, 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., Lapikas, L., Lehmann, I., Lenisa, Paolo, Lorenzon, W., B. Q., Ma, Mahon, D., Manaenkov, S. I., Mao, Y., Marianski, B., Marukyan, H., Movsisyan, A., Murray, M., Naryshkin, Y., Nass, A., Nowak, W. D., Pappalardo, Luciano Libero, Perez Benito, R., Petrosyan, A., Reimer, P. E., Reolon, A. R., Riedl, C., Rith, K., Rostomyan, A., Ryckbosch, D., Schaefer, A., Schnell, G., Schueler, K. P., Seitz, B., Shibata, T. A., Stahl, M., Stancari, M., Statera, Marco, 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
PHYSICS, MINIMAL FLAVOR VIOLATION, SYMMETRY, SEARCH, STANDARD MODEL, HIGGS-BOSON, DECAYS, LHC, COUPLINGS, PARTICLE, Socio-culturale
Published
2016

34. Erratum to: Spin density matrix elements in exclusive ω electroproduction on 1 H and 2 H targets at 27.5 GeV beam energy

Author

Airapetian, A., Akopov, N., Akopov, Z., 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, A., Reimer, P.E., Reolon, A.R., Riedl, C., Rith, K., Rostomyan, A., Ryckbosch, D., Schäfer, A., Schnell, G., 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
ddc:530, 530 Physik
Abstract

It has been found that three of the spin-density matrix elements (SDMEs) in Fig. 6 of the published paper were incorrectly labeled. The labels have been fixed, while none of the results or conclusions have changed.

Published
2016
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35. Erratum to: Spin density matrix elements in exclusive $\omega$ electroproduction on $^1$H and $^2$H targets at 27.5 GeV beam energy

Author

Airapetian, A., Akopov, N., Akopov, Z., 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, G., 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.

Abstract

The European physical journal / C 76(3), 162(2016). doi:10.1140/epjc/s10052-016-3996-x, It has been found that three of the spin-density matrix elements (SDMEs) in Fig. 6 of the published paper were incorrectly labeled. The labels have been fixed, while none of the results or conclusions have changed., Published by Springer, Berlin

Published
2016
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36. Deep sequencing multi-gene panel analysis is a useful first-tier test with a high diagnostic yield and broad mutation spectrum detection in childhood epilepsy

Author

Aradhya, S., primary, Patil, N., additional, Truty, R., additional, Riethmaier, D., additional, Elias, L., additional, Entezam, A., additional, Fuller, A., additional, Hambuch, T., additional, Hogue, M., additional, Khouzam, A., additional, Kobayashi, Y., additional, Lewis, R., additional, Nykamp, K., additional, Rabideau, M., additional, Westbrook, J., additional, Zeman, M., additional, and Nussbaum, R., additional

Published
2017
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37. Ratios of helicity amplitudes for exclusive $$\rho ^0$$ ρ 0 electroproduction on transversely polarized protons

Author

Airapetian, A., primary, Akopov, N., additional, Akopov, Z., additional, Aschenauer, E. C., additional, Augustyniak, W., additional, Belostotski, S., additional, Blok, H. P., additional, Borissov, A., additional, Bryzgalov, V., additional, Capitani, G. P., additional, Ciullo, G., additional, Contalbrigo, M., additional, Deconinck, W., additional, De Leo, R., additional, De Sanctis, E., additional, Düren, M., additional, Elbakian, G., additional, Ellinghaus, F., additional, Felawka, L., additional, Frullani, S., additional, Garibaldi, F., additional, Gavrilov, G., additional, Gharibyan, V., additional, Goloskokov, S. V., additional, Holler, Y., additional, Ivanilov, A., additional, Jackson, H. E., additional, Joosten, S., additional, Kaiser, R., additional, Karyan, G., additional, Kisselev, A., additional, Korotkov, V., additional, Kozlov, V., additional, Kravchenko, P., additional, Kroll, P., additional, Lagamba, L., additional, Lapikás, L., additional, Lehmann, I., additional, Lenisa, P., additional, Lorenzon, W., additional, Manaenkov, S. I., additional, Marianski, B., additional, Marukyan, H., additional, Miyachi, Y., additional, Movsisyan, A., additional, Muccifora, V., additional, Nass, A., additional, Nowak, W.-D., additional, Pappalardo, L. L., additional, Petrosyan, A., additional, Reimer, P. E., additional, Reolon, A. R., additional, Riedl, C., additional, Rith, K., additional, Rosner, G., additional, Rostomyan, A., additional, Ryckbosch, D., additional, Salomatin, Y., additional, Schäfer, A., additional, Schnell, G., additional, Seitz, B., additional, Shibata, T.-A., additional, Shutov, V., additional, Statera, M., additional, Terkulov, A., additional, Truty, R., additional, Trzcinski, A., additional, Tytgat, M., additional, Van Haarlem, Y., additional, Van Hulse, C., additional, Veretennikov, D., additional, Vikhrov, V., additional, Vilardi, I., additional, Yaschenko, S., additional, Zihlmann, B., additional, and Zupranski, P., additional

Published
2017
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38. Spin density matrix elements in exclusive ω electroproduction on 1H and 2H targets at 27.5 GeV beam energy

Author

Airapetian, A., Akopov, N., Akopov, Z., 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, A., Reimer, P. E., Reolon, A. R., Riedl, C., Rith, K., Rostomyan, A., Ryckbosch, D., Schäfer, A., Schnell, G., 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
High Energy Physics::Experiment, Nuclear Experiment
Abstract

Exclusive electroproduction of ω mesons on unpolarized hydrogen and deuterium targets is studied in the kinematic region of Q2

Published
2015

39. Spin density matrix elements in exclusive ω electroproduction on 1 H and 2 H targets at 27.5 GeV beam energy

Author

Airapetian, A.II. Physikalisches Institut, Justus-Liebig Universität Gießen, 35392, Gießen, Germany, Akopov, N.(Yerevan Physics Institute, 375036, Yerevan, Armenia), Akopov, Z.(DESY, 22603, Hamburg, Germany), Augustyniak, W.(National Centre for Nuclear Research, 00-689, Warsaw, Poland), Avetissian, A.(Yerevan Physics Institute, 375036, Yerevan, Armenia), Blok, H. P.(National Institute for Subatomic Physics (Nikhef), 1009 DB, Amsterdam, The Netherlands), Borissov, A.(DESY, 22603, Hamburg, Germany), Bryzgalov, V.(Institute for High Energy Physics, 142281, Protvino, Moscow Region, Russia), Capiluppi, M.(Sezione di Ferrara, Istituto Nazionale di Fisica Nucleare, 44122, Ferrara, Italy), Capitani, G. P.(Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, 00044, Frascati, Italy), Cisbani, E.(Sezione di Roma, Gruppo Collegato Sanità, Istituto Nazionale di Fisica Nucleare, 00161, Rome, Italy), Ciullo, G.(Sezione di Ferrara, Istituto Nazionale di Fisica Nucleare, 44122, Ferrara, Italy), Contalbrigo, M.(Sezione di Ferrara, Istituto Nazionale di Fisica Nucleare, 44122, Ferrara, Italy), Dalpiaz, P. F.(Sezione di Ferrara, Istituto Nazionale di Fisica Nucleare, 44122, Ferrara, Italy), Deconinck, W.(DESY, 22603, Hamburg, Germany), De Leo, R.(Sezione di Bari, Istituto Nazionale di Fisica Nucleare, 70124, Bari, Italy), De Sanctis, E.(Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, 00044, Frascati, Italy), Diefenthaler, M.(Physikalisches Institut, Universität Erlangen-Nürnberg, 91058, Erlangen, Germany), Di Nezza, P.(Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, 00044, Frascati, Italy), Düren, M.(II. Physikalisches Institut, Justus-Liebig Universität Gießen, 35392, Gießen, Germany), Ehrenfried, M.(II. Physikalisches Institut, Justus-Liebig Universität Gießen, 35392, Gießen, Germany), Elbakian, G.(Yerevan Physics Institute, 375036, Yerevan, Armenia), Ellinghaus, F.(Nuclear Physics Laboratory, University of Colorado, 80309-0390, Boulder, CO, USA), Etzelmüller, E.(II. Physikalisches Institut, Justus-Liebig Universität Gießen, 35392, Gießen, Germany), Fabbri, R.(DESY, 15738, Zeuthen, Germany), Felawka, L.(TRIUMF, V6T 2A3, Vancouver, BC, Canada), Frullani, S.(Sezione di Roma, Gruppo Collegato Sanità, Istituto Nazionale di Fisica Nucleare, 00161, Rome, Italy), Gabbert, D.(DESY, 15738, Zeuthen, Germany), Gapienko, G.(Institute for High Energy Physics, 142281, Protvino, Moscow Region, Russia), Gapienko, V.(Institute for High Energy Physics, 142281, Protvino, Moscow Region, Russia), Garibaldi, F.(Sezione di Roma, Gruppo Collegato Sanità, Istituto Nazionale di Fisica Nucleare, 00161, Rome, Italy), Gavrilov, G.(DESY, 22603, Hamburg, Germany), Gharibyan, V.(Yerevan Physics Institute, 375036, Yerevan, Armenia), Hartig, M.(DESY, 22603, Hamburg, Germany), Hasch, D.(Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, 00044, Frascati, Italy), Holler, Y.(DESY, 22603, Hamburg, Germany), Hristova, I.(DESY, 15738, Zeuthen, Germany), Ivanilov, A.(Institute for High Energy Physics, 142281, Protvino, Moscow Region, Russia), Jackson, H. E.(Physics Division, Argonne National Laboratory, 60439-4843, Argonne, IL, USA), Joosten, S.(Department of Physics and Astronomy, Ghent University, 9000, Gent, Belgium), Kaiser, R.(SUPA, School of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK), Karyan, G.(Yerevan Physics Institute, 375036, Yerevan, Armenia), Keri, T.(II. Physikalisches Institut, Justus-Liebig Universität Gießen, 35392, Gießen, Germany), Kinney, E.(Nuclear Physics Laboratory, University of Colorado, 80309-0390, Boulder, CO, USA), Kisselev, A.(B.P. Konstantinov Petersburg Nuclear Physics Institute, 188300, Gatchina, Leningrad Region, Russia), Korotkov, V.(Institute for High Energy Physics, 142281, Protvino, Moscow Region, Russia), Kozlov, V.(Lebedev Physical Institute, 117924, Moscow, Russia), Kravchenko, P.(B.P. Konstantinov Petersburg Nuclear Physics Institute, 188300, Gatchina, Leningrad Region, Russia), Krivokhijine, V. G.(Joint Institute for Nuclear Research, 141980, Dubna, Russia), Lagamba, L.(Sezione di Bari, Istituto Nazionale di Fisica Nucleare, 70124, Bari, Italy), Lapikás, L.(National Institute for Subatomic Physics (Nikhef), 1009 DB, Amsterdam, The Netherlands), Lehmann, I.(SUPA, School of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK), Lenisa, P.(Sezione di Ferrara, Istituto Nazionale di Fisica Nucleare, 44122, Ferrara, Italy), Lorenzon, W.(Randall Laboratory of Physics, University of Michigan, 48109-1040, Ann Arbor, MI, USA), Ma, B.-Q.(School of Physics, Peking University, 100871, Beijing, China), Mahon, D.(SUPA, School of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK), Manaenkov, S. I.(B.P. Konstantinov Petersburg Nuclear Physics Institute, 188300, Gatchina, Leningrad Region, Russia), Mao, Y.(School of Physics, Peking University, 100871, Beijing, China), Marianski, B.(National Centre for Nuclear Research, 00-689, Warsaw, Poland), Marukyan, H.(Yerevan Physics Institute, 375036, Yerevan, Armenia), Movsisyan, A.(Sezione di Ferrara, Istituto Nazionale di Fisica Nucleare, 44122, Ferrara, Italy), Murray, M.(SUPA, School of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK), Naryshkin, Y.(B.P. Konstantinov Petersburg Nuclear Physics Institute, 188300, Gatchina, Leningrad Region, Russia), Nass, A.(Physikalisches Institut, Universität Erlangen-Nürnberg, 91058, Erlangen, Germany), Nowak, W.-D.(DESY, 15738, Zeuthen, Germany), Pappalardo, L. L.(Sezione di Ferrara, Istituto Nazionale di Fisica Nucleare, 44122, Ferrara, Italy), Perez-Benito, R.(II. Physikalisches Institut, Justus-Liebig Universität Gießen, 35392, Gießen, Germany), Petrosyan, A.(Yerevan Physics Institute, 375036, Yerevan, Armenia), Reimer, P. E.(Physics Division, Argonne National Laboratory, 60439-4843, Argonne, IL, USA), Reolon, A. R.(Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, 00044, Frascati, Italy), Riedl, C.(DESY, 15738, Zeuthen, Germany), Rith, K.(Physikalisches Institut, Universität Erlangen-Nürnberg, 91058, Erlangen, Germany), Rostomyan, A.(DESY, 22603, Hamburg, Germany), Ryckbosch, D.(Department of Physics and Astronomy, Ghent University, 9000, Gent, Belgium), Schäfer, A.(Institut für Theoretische Physik, Universität Regensburg, 93040, Regensburg, Germany), Schnell, G.(Department of Theoretical Physics, University of the Basque Country UPV/EHU, 48080, Bilbao, Spain), Schüler, K. P.(DESY, 22603, Hamburg, Germany), Seitz, B.(SUPA, School of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK), Shibata, T.-A.(Department of Physics, Tokyo Institute of Technology, 152, Tokyo, Japan), Stahl, M.(II. Physikalisches Institut, Justus-Liebig Universität Gießen, 35392, Gießen, Germany), Stancari, M.(Sezione di Ferrara, Istituto Nazionale di Fisica Nucleare, 44122, Ferrara, Italy), Statera, M.(Sezione di Ferrara, Istituto Nazionale di Fisica Nucleare, 44122, Ferrara, Italy), Steffens, E.(Physikalisches Institut, Universität Erlangen-Nürnberg, 91058, Erlangen, Germany), Steijger, J. J. M.(National Institute for Subatomic Physics (Nikhef), 1009 DB, Amsterdam, The Netherlands), Taroian, S.(Yerevan Physics Institute, 375036, Yerevan, Armenia), Terkulov, A.(Lebedev Physical Institute, 117924, Moscow, Russia), Truty, R.(Department of Physics, University of Illinois, 61801-3080, Urbana, IL, USA), Trzcinski, A.(National Centre for Nuclear Research, 00-689, Warsaw, Poland), Tytgat, M.(Department of Physics and Astronomy, Ghent University, 9000, Gent, Belgium), Van Haarlem, Y.(Department of Physics and Astronomy, Ghent University, 9000, Gent, Belgium), Van Hulse, C.(Department of Theoretical Physics, University of the Basque Country UPV/EHU, 48080, Bilbao, Spain), Vikhrov, V.(B.P. Konstantinov Petersburg Nuclear Physics Institute, 188300, Gatchina, Leningrad Region, Russia), Vilardi, I.(Sezione di Bari, Istituto Nazionale di Fisica Nucleare, 70124, Bari, Italy), Wang, S.(School of Physics, Peking University, 100871, Beijing, China), Yaschenko, S.(DESY, 22603, Hamburg, Germany), Yen, S.(TRIUMF, V6T 2A3, Vancouver, BC, Canada), Zeiler, D.(Physikalisches Institut, Universität Erlangen-Nürnberg, 91058, Erlangen, Germany), Zihlmann, B.(DESY, 22603, Hamburg, Germany), and Zupranski, P.(National Centre for Nuclear Research, 00-689, Warsaw, Poland)

Abstract

Exclusive electroproduction of ω mesons on unpolarized hydrogen and deuterium targets is studied in the kinematic region of Q2>1.0 GeV 2 , 3.0 GeV

Published
2014

40. Spin density matrix elements in exclusive ω electroproduction on 1 H and 2 H targets at 27.5 GeV beam energy

Author

Airapetian, A., Akopov, N., Akopov, Z., 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, A., Reimer, P.E., Reolon, A.R., Riedl, C., Rith, K., Rostomyan, A., Ryckbosch, D., Schäfer, A., Schnell, G., 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
High Energy Physics::Experiment, Nuclear Experiment
Abstract

Exclusive electroproduction of ω mesons on unpolarized hydrogen and deuterium targets is studied in the kinematic region of Q2>1.0  GeV 2 , 3.0 GeVÂ

Published
2014

41. Transverse target single-spin asymmetry in inclusive electroproduction of charged pions and kaons

Author

Airapetian, A., Akopov, N., Akopov, Z., Aschenauer, E. C., Augustyniak, W., Avetissian, A., Avetisyan, E., Belostotski, S., Blok, H. P., Borissov, A., Bryzgalov, V., Burns, J., 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., Felawka, L., Frullani, S., Gabbert, D., Gapienko, G., Gapienko, V., Garay García, J., Garibaldi, F., Gavrilov, G., Gharibyan, V., Giordano, F., Gliske, S., Hartig, M., Hasch, D., Hoek, M., 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., Manaenkov, S. I., Mao, Y., Marianski, B., Marukyan, H., 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., Stinzing, F., Taroian, S., Terkulov, A., Truty, R., Trzcinski, A., Tytgat, M., Van Haarlem, Y., Van Hulse, C., Veretennikov, D., Vikhrov, V., Vilardi, I., Vogel, C., Wang, S., Yaschenko, S., Ye, Z., Yen, S., Zihlmann, B., and Zupranski, P.

Abstract

Single-spin asymmetries were investigated in inclusive electroproduction of charged pions and kaons\ud from transversely polarized protons at the Hermes experiment. The asymmetries were studied as a\ud function of the azimuthal angle ψ about the beam direction between the target-spin direction and the hadron production plane, the transverse hadron momentum PT relative to the direction of the incident beam, and the Feynman variable xF . The sinψ amplitudes are positive for π+ and K+, slightly negative for π− and consistent with zero for K−, with particular PT but weak xF dependences. Especially large asymmetries are observed for two small subsamples of events, where also the scattered electron was recorded by the spectrometer.

Published
2014

42. Spin density matrix elements in exclusive ω electroproduction on ¹H and ²H targets at 27.5 GeV beam energy

Author

Airapetian, A, Akopov, N, Akopov, Z, Augustyniak, W, Avetissian, A, Blok, HP, Borissov, A, Bryzgalov, V, Capiluppi, M, Capitani, GP, Cisbani, E, Ciullo, G, Contalbrigo, M, Dalpiaz, PF, 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, HE, Joosten, S, Kaiser, R, Karyan, G, Keri, T, Kinney, E, Kisselev, A, Korotkov, V, Kozlov, V, Kravchenko, P, Krivokhijine, VG, Lagamba, L, Lapikás, L, Lehmann, I, Lenisa, P, Lorenzon, W, Ma, BQ, Mahon, D, Manaenkov, SI, Mao, Y, Marianski, B, Marukyan, H, Movsisyan, A, Murray, M, Naryshkin, Y, Nass, A, Nowak, WD, Pappalardo, LL, Perez-Benito, R, Petrosyan, A, Reimer, PE, Reolon, AR, Riedl, C, Rith, K, Rostomyan, A, Ryckbosch, Dirk, Schäfer, A, Schnell, G, Schüller, KP, Seitz, B, Shibata, TA, Stahl, M, Stancari, M, Statera, M, Steffens, E, Steijger, JJM, Taroian, S, Terkulov, A, Truty, R, Trzcinski, A, Tytgat, Michael, Van Haarlem, Y, VanHulse, C, Vikhrov, V, Vilardi, I, Wang, S, Yaschenko, S, Yen, S, Zeiler, D, Zihlmann, B, and Zupranski, P

Subjects
Physics and Astronomy, PARTON DISTRIBUTIONS, VECTOR-MESON LEPTOPRODUCTION, High Energy Physics::Experiment, Nuclear Experiment, QCD, VIRTUAL COMPTON-SCATTERING
Abstract

Exclusive electroproduction of. mesons on unpolarized hydrogen and deuterium targets is studied in the kinematic region of Q(2) > 1.0 GeV2, 3.0 GeV < W < 6.3 GeV, and -t ' < 0.2 GeV2. Results on the angular distribution of the omega meson, including its decay products, are presented. The data were accumulated with the HER-MES forward spectrometer during the 1996-2007 running period using the 27.6 GeV longitudinally polarized electron or positron beam of HERA. The determination of the virtual-photon longitudinal-to-transverse cross-section ratio reveals that a considerable part of the cross section arises from transversely polarized photons. Spin density matrix elements are presented in projections of Q(2) or -t '. Violation of s-channel helicity conservation is observed for some of these elements. Asizable contribution from unnatural-parity-exchange amplitudes is found and the phase shift between those amplitudes that describe transverse omega production by longitudinal and transverse virtual photons,gamma(L)* -> omega(T) and gamma(T)* -> omega(T), is determined for the first time. A hierarchy of helicity amplitudes is established, which mainly means that the unnatural-parity-exchange amplitude describing the gamma(T)* -> omega(T) transition dominates over the two natural-parity-exchange amplitudes describing the gamma(L)* -> omega(L) and gamma(T)* -> omega(T) transitions, with the latter two being of similar magnitude. Good agreement is found between the HERMES proton data and results of a pQCD-inspired phenomenological model that includes pion-pole contributions, which are of unnatural parity.

Published
2014

43. Spin density matrix elements in exclusive omega electroproduction on H-1 and H-2 targets at 27.5 GeV beam energy

Author

Airapetian, A., Akopov, N., Akopov, Z., Augustyniak, W., Avetissian, A., Blok, H. P., Borissov, A., Bryzgalov, V., Capiluppi, Marco, Capitani, G. P., Cisbani, E., Ciullo, Giuseppe, Contalbrigo, Marco, 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, Paolo, Lorenzon, W., B. Q., Ma, Mahon, D., Manaenkov, S. I., Mao, Y., Marianski, B., Marukyan, H., Movsisyan, A., Murray, M., Naryshkin, Y., Nass, A., Nowak, W. D., Pappalardo, Luciano Libero, Perez Benito, R., Petrosyan, A., Reimer, P. E., Reolon, A. R., Riedl, C., Rith, K., Rostomyan, A., Ryckbosch, D., Schäfer, A., Schnell, G., Schüler, K. P., Seitz, B., Shibata, T. A., Stahl, M., Stancari, Michelle Dawn, Statera, Marco, 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
13.60.-r Photon and charged-lepton interactions with hadrons, 29.27.Hj Polarized beams, 13.60.-r Photon and charged-lepton interactions with hadrons, 34.80.Nz Spin dependence of cross sections, polarized beam experiments, 29.27.Hj Polarized beams, 34.80.Nz Spin dependence of cross sections, NO
Published
2014

44. 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
Full Text
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45. Transverse target single-spin asymmetry in inclusive electroproduction of charged pions and kaons

Author

Airapetian, A., Akopov, N., Blok, H. P., Schnell, G., Seitz, B., Shibata, T. A., Shutov, V., Stancari, M., Statera, M., Steffens, E., Steijger, J. J. M., Stewart, J., Stinzing, F., Borissov, A., Taroian, S., Terkulov, A., Truty, R., Trzcinski, A., Tytgat, M., Van Haarlem, Y., Van Hulse, C., Veretennikov, D., Vikhrov, V., Vilardi, I., Bowles, J., Wang, Siguang, Yaschenko, S., Ye, Z., Yen, S., Yu, W., Zagrebelnyy, V., Zeiler, D., Zihlmann, B., Zupranski, P., HERMES Collaboration, Bryzgalov, V., Burns, J., Capiluppi, M., Capitani, G. P., Cisbani, E., Ciullo, G., Contalbrigo, M., Akopov, Zaven, Dalpiaz, P. F., Deconinck, W., De Leo, R., De Nardo, L., De Sanctis, E., Diefenthaler, M., Di Nezza, P., Duren, M., Ehrenfried, M., Elbakian, G., Aschenauer, E. C., Ellinghaus, F., Fabbri, R., Fantoni, A., Felawka, L., Frullani, S., Gabbert, D., Gapienko, G., Gapienko, V., Gavrilov, G., Gharibyan, V., Augustyniak, W., Giordano, F., Gliske, S., Golembiovskaya, M., Hadjidakis, C., Hartig, M., Hasch, D., Hillenbrand, A., Hoek, M., Holler, Y., Hristova, I., Avakian, R., Ivanilov, A., Jackson, H. E., Joosten, S., Kaiser, R., Karyan, G., Keri, T., Kinney, E., Kisselev, A., Korotkov, V., Kozlov, V., Avetissian, A., Kravchenko, P., Krivokhijine, V. G., Lagamba, L., Lapikas, L., Lehmann, I., Lenisa, P., Lopez Ruiz, A., Lorenzon, W., Ma, B. Q., Mahon, D., Avetisyan, E., Makins, N. C. R., Manaenkov, S. I., Mao, Y., Marianski, B., Martinez de la Ossa, A., Marukyan, H., Miller, C. A., Miyachi, Y., Movsisyan, A., Murray, M., Belostotski, S., Mussgiller, A., Nappi, E., Naryshkin, Y., Negodaev, M., Nowak, W. D., Pappalardo, L. L., Perez-Benito, R., Petrosyan, A., Raithel, M., Reimer, P. E., Bianchi, N., Reolon, A. R., Riedl, C., Rith, K., Rosner, G., Rostomyan, A., Rubin, J., Ryckbosch, D., Salomatin, Y., Sanftl, F., and Schafer, A.

Subjects
Nuclear Theory, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Single-spin asymmetries were investigated in inclusive electroproduction of charged pions and kaons from transversely polarized protons at the HERMES experiment. The asymmetries were studied as a function of the azimuthal angle $\psi$ about the beam direction between the target-spin direction and the hadron production plane, the transverse hadron momentum relative to the direction of the incident beam, and the Feynman variable $x_F$. The $\sin(\psi)$ amplitudes are positive for positive pions and kaons, slightly negative for negative pions and consistent with zero for negative kaons, with particular transverse-momentum but weak $x_F$ dependences. Especially large asymmetries are observed for two small subsamples of events, where also the scattered electron was recorded by the spectrometer. arXiv

Published
2013

46. Beam-helicity asymmetry in associated electroproduction of real photons $ep \to e����N$ in the $��$-resonance region

Author

The HERMES Collaboration, Airapetian, A., Akopov, N., Aschenauer, E. C., Augustyniak, W., Avakian, R., Avetissian, A., Avetisyan, E., Blok, H. P., B��ttcher, 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., D��ren, M., Ehrenfried, M., Elbakian, G., Ellinghaus, F., Etzelm��ller, E., Fabbri, R., Frullani, S., Gapienko, G., Gapienko, V., Garc��a, 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., Lapik��s, 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., Sch��fer, 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
High Energy Physics - Experiment (hep-ex), Physics::Accelerator Physics, FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex)
Abstract

The beam-helicity asymmetry in associated electroproduction of real photons, $ep\to e����N$, in the $��$(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, $ep\to e����^0 p$ and $ep\to e����^+ n$, from a data set collected with a recoil detector. All asymmetry amplitudes are found to be consistent with zero., 17 pages, 4 figures, (minor changes wit respect to previous arXiv version)

Published
2013
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47. Measurement of the virtual-photon asymmetry A₂ and the spin-structure function g₂ of the proton

Author

Airapetian, A, Akopov, N, Akopov, Z, Aschenauer, EC, Augustyniak, W, Avakian, R, Avetissian, A, Avetisyan, E, Belostotski, S, Bianchi, N, Blok, HP, Borissov, A, Bowles, J, Bryzgalov, V, Burns, J, Capiluppi, M, Capitani, GP, Cisbani, E, Ciullo, G, Contalbrigo, M, Dalpiaz, PF, Deconinck, W, De Leo, R, De Nardo, Lara, De Sanctis, E, Diefenthaler, M, Di Nezza, P, Duren, M, Ehrenfried, M, Elbakian, G, Ellinghaus, F, Fantoni, A, Felawka, L, Frullani, S, Gabbert, Dominik, Gapienko, G, Gapienko, V, Garibaldi, F, Gavrilov, G, Gharibyan, V, Giordano, F, Gliske, S, Golembiovskaya, M, Hadjidakis, C, Hartig, M, Hasch, D, Hillenbrand, A, Hoek, M, Holler, Y, Hristova, I, Imazu, Y, Ivanilov, A, Jackson, HE, Jo, HS, Joosten, S, Kaiser, R, Karyan, G, Keri, T, Kinney, E, Kisselev, A, Korotkov, V, Kozlov, V, Kravchenko, P, Krivokhijine, VG, Lagamba, L, Lapikas, L, Lehmann, I, Lenisa, P, Lopez Ruiz, Alejandro, Lorenzon, W, Ma, BQ, Mahon, D, Makins, NCR, Manaenkov, SI, Manfre, L, Mao, Y, Marianski, B, de la Ossa, AM, Marukyan, H, Miller, CA, Miyachi, Y, Movsisyan, A, Muccifora, V, Murray, M, Mussgiller, A, Nappi, E, Naryshkin, Y, Nass, A, Negodaev, M, Nowak, WD, Pappalardo, LL, Perez-Benito, R, Petrosyan, A, Reimer, PE, Reolon, AR, Riedl, C, Rith, K, Rosner, G, Rostomyan, A, Rubin, J, Ryckbosch, Dirk, Salomatin, Y, Sanftl, F, Schafer, A, Schnell, G, Schuler, KP, Seitz, B, Shibata, TA, Shutov, V, Stancari, M, Statera, M, Steffens, E, Steijger, JJM, Stewart, J, Stinzing, F, Taroian, S, Terkulov, A, Truty, R, Trzcinski, A, Tytgat, Michael, Vandenbroucke, A, Van Haarlem, Y, Van Hulse, Charlotte, Veretennikov, D, Vikhrov, V, Vilardi, I, Wang, S, Yaschenko, S, Ye, Z, Yen, S, Zagrebelnyy, V, Zeiler, D, Zihlmann, B, and Zupranski, P

Subjects
DEEP-INELASTIC-SCATTERING, SUM-RULES, POLARIZATION, TARGET, Physics and Astronomy, ELECTRON STORAGE-RING, HERA, POLARIMETER, High Energy Physics::Experiment, Nuclear Experiment
Abstract

A measurement of the virtual-photon asymmetry A(2)(x, Q(2)) and of the spin-structure function g(2)(x, Q(2)) of the proton are presented for the kinematic range 0.004 < x < 0.9 and 0.18 GeV2 < Q(2) < 20 GeV2. The data were collected by the HERMES experiment at the HERA storage ring at DESY while studying inclusive deep-inelastic scattering of 27.6 GeV longitudinally polarized leptons off a transversely polarized hydrogen gas target. The results are consistent with previous experimental data from CERN and SLAC. For the x-range covered, the measured integral of g(2)(x) converges to the null result of the Burkhardt-Cottingham sum rule. The x(2) moment of the twist-3 contribution to g(2)(x) is found to be compatible with zero.

Published
2012

48. Erratum to: Spin density matrix elements in exclusive $$\omega $$ electroproduction on $$^1$$H and $$^2$$H targets at 27.5 GeV beam energy

Author

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

Published
2016
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49. Transverse-target-spin asymmetry in exclusive $$\omega $$-meson electroproduction

Author

Airapetian, A., primary, Akopov, N., additional, Akopov, Z., additional, Aschenauer, E. C., additional, Augustyniak, W., additional, Avetissian, A., additional, Belostotski, S., additional, Blok, H. P., additional, Borissov, A., additional, Bryzgalov, V., additional, Capitani, G. P., additional, Ciullo, G., additional, Contalbrigo, M., additional, Dalpiaz, P. F., additional, Deconinck, W., additional, De Leo, R., additional, De Sanctis, E., additional, Diefenthaler, M., additional, Di Nezza, P., additional, Düren, M., additional, Elbakian, G., additional, Ellinghaus, F., additional, Felawka, L., additional, Frullani, S., additional, Gabbert, D., additional, Gapienko, G., additional, Gapienko, V., additional, Gharibyan, V., additional, Giordano, F., additional, Gliske, S., additional, Hasch, D., additional, Hoek, M., additional, Holler, Y., additional, Ivanilov, A., additional, Jackson, H. E., additional, Joosten, S., additional, Kaiser, R., additional, Karyan, G., additional, Keri, T., additional, Kinney, E., additional, Kisselev, A., additional, Korotkov, V., additional, Kozlov, V., additional, Krivokhijine, V. G., additional, Lagamba, L., additional, Lapikás, L., additional, Lehmann, I., additional, Lenisa, P., additional, Lorenzon, W., additional, Ma, B.-Q., additional, Manaenkov, S. I., additional, Mao, Y., additional, Marianski, B., additional, Marukyan, H., additional, Miyachi, Y., additional, Movsisyan, A., additional, Muccifora, V., additional, Naryshkin, Y., additional, Nass, A., additional, Negodaev, M., additional, Nowak, W.-D., additional, Pappalardo, L. L., additional, Perez-Benito, R., additional, Petrosyan, A., additional, Reimer, P. E., additional, Reolon, A. R., additional, Riedl, C., additional, Rith, K., additional, Rosner, G., additional, Rostomyan, A., additional, Rubin, J., additional, Ryckbosch, D., additional, Salomatin, Y., additional, Schnell, G., additional, Seitz, B., additional, Shibata, T.-A., additional, Statera, M., additional, Steffens, E., additional, Steijger, J. J. M., additional, Stinzing, F., additional, Taroian, S., additional, Terkulov, A., additional, Truty, R., additional, Trzcinski, A., additional, Tytgat, M., additional, Van Haarlem, Y., additional, Van Hulse, C., additional, Vikhrov, V., additional, Vilardi, I., additional, Vogel, C., additional, Wang, S., additional, Yaschenko, S., additional, Yen, S., additional, Zihlmann, B., additional, and Zupranski, P., additional

Published
2015
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50. Transverse target single-spin asymmetry in inclusive electroproduction of charged pions and kaons

Author

Física teórica e historia de la ciencia, Fisika teorikoa eta zientziaren historia, Airapetian, A., Akopov, N., Akopov, Z., Aschenauer, E.C., Augustynia, W., Avakian, R., Avetissian, A., Avetisyan, E., Belostotski, S., Bianchi, N., Blok, H.P., Borissov, A., Bowles, J., Bryzgalov, V., Burns, J., Capiluppi, M., Capitani, G.P., Cisbani, E., Ciullo, G., Contalbrigo, M., Dalpiaz, P.F., Deconinck, W., De Leo, R., De Nardo, L., De Sanctis, E., Diefenthaler, M., Di Nezza, P., Dürenn, M., Ehrenfried, M., Elbakian, G., Ellinghaus, F., Fabbri, R., Fantoni, A., Felawka, L., Frullani, S., Gabberth, D., Gapienko, G., Gapienko, V., Gavrilov, G., Gharibyan, V., Giordano, F., Gliske, S., Golembiovskaya, M., Hadjidakis, C., Hartig, M., Hasch, D., Hillenbrand, A., Hoek, M., 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., López Ruiz, A., Lorenzon, W., Ma, B.-Q., Mahon, D., Makins, N.C.R., Manaenkov, S.I., Mao, Y., Marianski, B., Martínez de la Ossa, A., Marukyan, H., Miller, C.A., Miyachi, Y., Movsisyan, A., Murray, M., Mussgiller, A., Nappi, E., Naryshkin, Y., Negodaev, M., Nowak, W.-D., Pappalardo, L.L., Perez-Benito, R., Petrosyan, A., Raithel, M., Reimer, P.E., Reolon, A.R., Riedl, C., Rith, K., Rosner, G., Rostomyan, A., Rubin, J., Ryckbosch, D., Salomatin, Y., Sanftl, F., Schäferv, A., Schnell, Gunar, Seitz, B., Shibata, T.-A., Shutov, V., Stancari, 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, Charlotte Barbara, Veretennikov, D., Vikhrov, V., Vilardi, I., Wang, S., Yaschenko, S., Ye, Z., Yen, S., Yu, W., Zagrebelnyy, V., Zeiler, D., Zihlmann, V., Zupranski, P., Física teórica e historia de la ciencia, Fisika teorikoa eta zientziaren historia, Airapetian, A., Akopov, N., Akopov, Z., Aschenauer, E.C., Augustynia, W., Avakian, R., Avetissian, A., Avetisyan, E., Belostotski, S., Bianchi, N., Blok, H.P., Borissov, A., Bowles, J., Bryzgalov, V., Burns, J., Capiluppi, M., Capitani, G.P., Cisbani, E., Ciullo, G., Contalbrigo, M., Dalpiaz, P.F., Deconinck, W., De Leo, R., De Nardo, L., De Sanctis, E., Diefenthaler, M., Di Nezza, P., Dürenn, M., Ehrenfried, M., Elbakian, G., Ellinghaus, F., Fabbri, R., Fantoni, A., Felawka, L., Frullani, S., Gabberth, D., Gapienko, G., Gapienko, V., Gavrilov, G., Gharibyan, V., Giordano, F., Gliske, S., Golembiovskaya, M., Hadjidakis, C., Hartig, M., Hasch, D., Hillenbrand, A., Hoek, M., 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., López Ruiz, A., Lorenzon, W., Ma, B.-Q., Mahon, D., Makins, N.C.R., Manaenkov, S.I., Mao, Y., Marianski, B., Martínez de la Ossa, A., Marukyan, H., Miller, C.A., Miyachi, Y., Movsisyan, A., Murray, M., Mussgiller, A., Nappi, E., Naryshkin, Y., Negodaev, M., Nowak, W.-D., Pappalardo, L.L., Perez-Benito, R., Petrosyan, A., Raithel, M., Reimer, P.E., Reolon, A.R., Riedl, C., Rith, K., Rosner, G., Rostomyan, A., Rubin, J., Ryckbosch, D., Salomatin, Y., Sanftl, F., Schäferv, A., Schnell, Gunar, Seitz, B., Shibata, T.-A., Shutov, V., Stancari, 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, Charlotte Barbara, Veretennikov, D., Vikhrov, V., Vilardi, I., Wang, S., Yaschenko, S., Ye, Z., Yen, S., Yu, W., Zagrebelnyy, V., Zeiler, D., Zihlmann, V., and Zupranski, P.

Abstract

Single-spin asymmetries were investigated in inclusive electroproduction of charged pions and kaons from transversely polarized protons at the HERMES experiment. The asymmetries were studied as a function of the azimuthal angle psi about the beam direction between the target-spin direction and the hadron production plane, the transverse hadron momentum P-T relative to the direction of the incident beam, and the Feynman variable x(F). The sin psi* amplitudes are positive for pi(+) and K+ slightly negative for pi(-) and consistent with zero for K-, with particular P-T but weak x(F) dependences. Especially large asymmetries are observed for two small subsamples of events, where also the scattered electron was recorded by the spectrometer. (C) 2013 The Authors. Published by Elsevier B.V. All rights reserved.

Published
2014

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