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1. Ratios of helicity amplitudes for exclusive ρ0 electroproduction

Author

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

Subjects
Systematic Uncertainty, Amplitude Ratio, Total Uncertainty, Helicity Amplitude, ZEUS Collaboration, Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract Exclusive ρ 0-meson electroproduction is studied in the HERMES experiment, using a 27.6 GeV longitudinally polarized electron/positron beam and unpolarized hydrogen and deuterium targets in the kinematic region 0.5 GeV2

Published
2011
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2. Transverse momentum broadening of hadrons produced in semi-inclusive deep-inelastic scattering on nuclei

Author

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

Subjects
HERMES experiment, Nuclear and High Energy Physics, Particle physics, Meson, DEUTERIUM, Hadron, FOS: Physical sciences, Virtual particle, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), TARGETS, 0103 physical sciences, ddc:530, HADRONIZATION, Nuclear Experiment, 010306 general physics, Mass number, Physics, 010308 nuclear & particles physics, HERA, Deep inelastic scattering, Physics and Astronomy, High Energy Physics::Experiment, FRAGMENTATION, Lepton
Abstract

The first direct measurement of the dependence on target nuclear mass of the average squared transverse momentum of pi+, pi-, and K+ mesons from deep-inelastic lepton scattering is obtained as a function of several kinematic variables. The data were accumulated at the HERMES experiment at DESY, in which the HERA 27.6 GeV lepton beam was scattered off several nuclear gas targets. The average squared transverse momentum was clearly observed to increase with atomic mass number. The effect increases as a function of Q**2 and x and remains constant as a function of both the virtual photon energy nu and the fractional hadron energy z, except that it vanishes as z approaches unity., Comment: 6 pages, 2 figures

Published
2010

3. Single-spin azimuthal asymmetry in exclusive electroproduction of π+ mesons on transversely polarized protons

Author

P. Lenisa, A. Trzcinski, S. Belostotski, Xianguo Lu, V. Bryzgalov, Wouter Deconinck, Adel Terkulov, J. J. M. Steijger, W. Augustyniak, I. Vilardi, Y. Holler, V. A. Korotkov, M. Varanda, R. Perez-Benito, M. Contalbrigo, David Mahon, Morgan Murray, J. Stewart, C. Riedl, Andreas Schäfer, Michael Tytgat, T. A. Shibata, B. Zihlmann, L. L. Pappalardo, C. B. Van Hulse, S. Taroian, D. Veretennikov, Hengqiang Ye, V. A. Gapienko, A. Ivanilov, C. Bonomo, E. Cisbani, Alexander Borissov, Hasko Stenzel, A. Airapetian, B. Seitz, E. C. Aschenauer, N. Akopov, F. Giordano, T. Keri, Vitaly Shutov, H. P. Blok, Naomi C R Makins, Y. J. Mao, P. Kravchenko, G. Elbakian, Y. Naryshkin, Wolfgang Lorenzon, M. Capiluppi, Valeria Muccifora, E. Avetisyan, S. I. Manaenkov, Dirk Ryckbosch, J. Burns, G. Ciullo, Ivana Hristova, S. Yaschenko, Frank Ellinghaus, Stephen V. Gliske, E. R. Kinney, V. Vikhrov, A. Hillenbrand, Y. Imazu, L. Felawka, P. B. van der Nat, A. Movsisyan, F. Sanftl, P. Zupranski, S. Yen, K. Rith, W.-D. Nowak, G. P. Capitani, Ralf Kaiser, M. Ehrenfried, M. Statera, J. Dreschler, D. Zeiler, L. Manfré, G. Rosner, R. Lamb, G. Hill, C. Vogel, E. De Sanctis, L. Lagamba, Eugenio Nappi, Z. Akopov, Nagao Kobayashi, F. Garibaldi, C. A. Miller, X. R. Lu, W. Yu, D. Gabbert, M. Diefenthaler, H. Marukyan, P. E. Reimer, Alessandra Fantoni, M. Hoek, H. S. Jo, A. Nass, H. E. Jackson, Shan Wang, Y. Salomatin, A. Rostomyan, A. R. Reolon, B. Q. Ma, A. Avetissian, B. Ball, R. De Leo, H. Böttcher, Andreas Mussgiller, A. López Ruiz, Y. Van Haarlem, B. Martinez de la Ossa, Michael Düren, M. Stancari, M. Hartig, S. Frullani, P. Di Nezza, Cynthia Marie Hadjidakis, Y. Miyachi, D. Hasch, K. P. Schüler, L. De Nardo, Zhenyu Ye, Nicola Bianchi, V. Gharibyan, J. G. Rubin, I. Lehmann, B. Marianski, P. F. Dalpiaz, Arne Vandenbroucke, Riccardo Fabbri, S. Joosten, A. Kisselev, L. A. Linden-Levy, G. Schnell, and L. Lapikás

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Photon, Proton, Meson, 010308 nuclear & particles physics, Scattering, media_common.quotation_subject, Virtual particle, 01 natural sciences, Asymmetry, Nuclear physics, 0103 physical sciences, Photon polarization, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon, media_common
Abstract

Exclusive electroproduction of π+ mesons was studied by scattering 27.6 GeV positrons or electrons off a transversely polarized hydrogen target. The single-spin azimuthal asymmetry with respect to target polarization was measured as a function of the Mandelstam variable t, the Bjorken scaling variable xB, and the virtuality Q2 of the exchanged photon. The extracted Fourier components of the asymmetry were found to be consistent with zero, except one that was found to be large and that involves interference of contributions from longitudinal and transverse virtual photons.

Published
2010

4. Exclusive ρ0 electroproduction on transversely polarized protons

Author

P. Zupranski, C. A. Miller, P. Lenisa, A. Fantoni, T. A. Shibata, B. Zihlmann, L. L. Pappalardo, G. Rosner, D. Gabbert, Hengqiang Ye, A. Trzcinski, A. López Ruiz, Alexander Borissov, Hasko Stenzel, Xianguo Lu, T. Keri, G. Ciullo, W.-D. Nowak, S. Yen, M. Contalbrigo, M. Diefenthaler, E. C. Aschenauer, Ralf Kaiser, V. Muccifora, Naomi C R Makins, H. Marukyan, E. Steffens, Y. Van Haarlem, E. Avetisyan, Michael Tytgat, A. R. Reolon, A. Martinez de la Ossa, E. Cisbani, X. R. Lu, M. Ehrenfried, A. Hillenbrand, Y. Imazu, A. Airapetian, Stephen V. Gliske, F. Sanftl, S. Yaschenko, V. Vikhrov, M. Statera, C. Hadjidakis, L. Lagamba, S. Taroian, N. Akopov, Y. Salomatin, P. Di Nezza, B. Q. Ma, W. Augustyniak, D. Zeiler, M. Varanda, F. Stinzing, V. Bryzgalov, C. Vogel, Y. J. Mao, P. Kravchenko, B. Ball, Morgan Murray, L. Manfré, A. Movsisyan, M. Hartig, R. Lamb, R. De Leo, V. A. Korotkov, F. Giordano, David Mahon, J. Stewart, M. Hoek, C. B. Van Hulse, Adel Terkulov, L. Fellawka, Frank Ellinghaus, Andreas Schäfer, E. R. Kinney, R. Perez-Benito, A. Ivanilov, C. Bonomo, J. Burns, M. Capiluppi, H. Böttcher, H. E. Jackson, Y. Naryshkin, G. Elbakian, W. Yu, S. I. Manaenkov, A. Nass, J. G. Rubin, V. A. Gapienko, N. Bianchi, Andreas Mussgiller, Wouter Deconinck, G. Hill, Y. Holler, B. Seitz, I. Lehmann, K. Rith, E. Nappi, Z. Akopov, Nagao Kobayashi, P. B. van der Nat, J. Dreschler, P. E. Reimer, Shan Wang, D. Veretennikov, L. A. Linden-Levy, G. Schnell, C. Riedl, L. Lapikás, K. P. Schüler, Vitaly Shutov, P.F. Dalpiaz, A. Rostomyan, H. P. Blok, A. Avetissian, G.P. Capitani, H. S. Jo, Wolfgang Lorenzon, G. Gapienko, Ivana Hristova, E. De Sanctis, D. Hasch, S. Frullani, Dirk Ryckbosch, B. Marianski, Arne Vandenbroucke, Riccardo Fabbri, S. Joosten, A. Kisselev, J. J. M. Steijger, Michael Düren, M. Stancari, L. De Nardo, Zhenyu Ye, I. Vilardi, V. Gharibyan, Y. Miyachi, and (Astro)-Particles Physics

Subjects
14.40.Aq, Quark, Nuclear and High Energy Physics, Particle physics, Meson, FOS: Physical sciences, HERMES, Parton, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Matrix (mathematics), 13.88.+e, GENERALIZED PARTON DISTRIBUTIONS, Total angular momentum quantum number, 0103 physical sciences, Proton spin crisis, ddc:530, NUCLEON, Nuclear Experiment, 010306 general physics, VIRTUAL COMPTON-SCATTERING, Physics, 010308 nuclear & particles physics, 13.60.Le, 14.20.Dh, 12.38.Qk, QCD, Helicity, TARGET, Physics and Astronomy, High Energy Physics::Experiment, SDG 6 - Clean Water and Sanitation, Nucleon, VECTOR-MESON PRODUCTION
Abstract

The exclusive electroproduction of rho-0 mesons was studied with the HERMES spectrometer at the DESY laboratory by scattering 27.6 GeV positron and electron beams off a transversely polarized hydrogen target. Spin density matrix elements for this process were determined from the measured production- and decay-angle distributions of the produced rho-0 mesons. These matrix elements embody information on helicity transfer and the validity of s-channel helicity conservation in the case of a transversely polarized target. From the spin density matrix elements, the leading-twist term in the single-spin asymmetry was calculated separately for longitudinally and transversely polarized rho-0 mesons. Neglecting s-channel helicity changing matrix elements, results for the former can be compared to calculations based on generalized parton distributions, which are sensitive to the contribution of the total angular momentum of the quarks to the proton spin., 7 pages, 5 figures

Published
2009

5. Measurement of parton distributions of strange quarks in the nucleon from charged-kaon production in deep-inelastic scattering on the deuteron

Author

A. Reischl, W. Augustyniak, R. Perez-Benito, B. Maiheu, Alessandra Fantoni, D. Veretennikov, M. Negodaev, B. Hommez, G. Ciullo, Tetsuya Hasegawa, M. Hoek, E. De Sanctis, V. A. Gapienko, W.H.A. Hesselink, B. Zihlmann, Y. Naryshkin, P. E. Reimer, A. Kisselev, J. G. Rubin, A. Brull, B. Tchuiko, M. Kopytin, Cynthia Marie Hadjidakis, Y. Miyachi, A. Nass, G. Gapienko, I. Lehmann, D. Hasch, A. López Ruiz, Z. Akopov, A. Elalaoui-Moulay, Frank Ellinghaus, C. Shearer, B. Seitz, A. Hillenbrand, Y. Imazu, E. Nappi, Y. Van Haarlem, Michael Tytgat, E. R. Kinney, Y. Holler, A. Airapetian, U. Elschenbroich, S. Taroian, P. Lenisa, David Mahon, Y. Salomatin, B. Marianski, A. Trzcinski, P. B. van der Nat, J. Burns, Shan Wang, F. Stinzing, Andreas Schäfer, H. E. Jackson, V. G. Krivokhijine, A. Funel, B. Q. Ma, J. J. M. Steijger, Michael Düren, G. van der Steenhoven, A. Osborne, M. Stancari, P. Zupranski, C. Riedl, S. E. Rock, P. Di Nezza, V. Vikhrov, L. Rubacek, R. De Leo, A. Rostomyan, K. Rith, C. B. Van Hulse, A. Borissov, A. R. Reolon, A. Avetissian, M. Capiluppi, P. Liebing, A. Ivanilov, S. Belostotski, G. Rosner, H. Böttcher, V. Bryzgalov, J. Dreschler, L. De Nardo, W. Yu, F. Garibaldi, Morgan Murray, G. Iarygin, Zhenyu Ye, E. C. Aschenauer, G. Hill, K. P. Schüler, Y. X. Ye, P.F. Dalpiaz, J. Stewart, I. Vilardi, Andreas Mussgiller, A. Andrus, M. Diefenthaler, V. Gharibyan, P. Tait, L. A. Linden-Levy, W.-D. Nowak, T. A. Shibata, E. Avetissian, M. Demey, Nicola Bianchi, R.O. Avakian, H. Marukyan, C. Bonomo, E. Cisbani, V. A. Kozlov, D. Reggiani, G. Schnell, F. Giordano, S. Joosten, J. Streit, I. M. Gregor, H. Ye, A. Jgoun, Arne Vandenbroucke, Riccardo Fabbri, L. Manfré, Stephen V. Gliske, H. Guler, M. Varanda, L. Felawka, X. R. Lu, L. Lagamba, S. Yen, G. P. Capitani, Ralf Kaiser, E. Steffens, G. Gavrilov, L. Lapikás, M. Contalbrigo, Martin Raithel, I. Sanjiev, Naomi C R Makins, M. Ehrenfried, Andrey V. Izotov, C. A. Miller, D. Gabbert, Tsutomu Kobayashi, M. Statera, S. Frullani, N. Pickert, Dirk Ryckbosch, D. Zeiler, C. Vogel, V. A. Korotkov, G. Elbakian, S. Lu, Y. J. Mao, P. Kravchenko, Adel Terkulov, T. Keri, L. L. Pappalardo, Hasko Stenzel, Wouter Deconinck, Valeria Muccifora, V. Mexner, A. Nagaitsev, N. Akopov, S. Yaschenko, Vitaly Shutov, H. P. Blok, Wolfgang Lorenzon, Ivana Hristova, R. Lamb, (Astro)-Particles Physics, Photo Conversion Materials, and Student Lab and Education

Subjects
Quark, Particle physics, Strange quark, Nuclear and High Energy Physics, Nuclear Theory, FOS: Physical sciences, Parton, 01 natural sciences, NO, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 13.60.-r, 13.88.+e, 14.20.Dh, 14.65.-q, 0103 physical sciences, ddc:530, SDG 14 - Life Below Water, 010306 general physics, Nuclear Experiment, Physics, 010308 nuclear & particles physics, Scattering, Deep inelastic scattering, Helicity, Strange matter, Physics and Astronomy, High Energy Physics::Experiment, Nucleon
Abstract

The momentum and helicity density distributions of the strange quark sea in the nucleon are obtained in leading order from charged-kaon production in deep-inelastic scattering on the deuteron. The distributions are extracted from spin-averaged K+/- multiplicities, and from K+/- and inclusive double-spin asymmetries for scattering of polarized positrons by a polarized deuterium target. The shape of the momentum distribution is softer than that of the average of the ubar and dbar quarks. In the region of measurement 0.02 < x < 0.6 and Q^2 > 1.0 GeV^2, the helicity distribution is zero within experimental uncertainties., 5 pages, 5 figures, 1 table; text slightly expanded, 10 references added

Published
2008
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6. Azimuthal distributions of charged hadrons, pions, and kaons produced in deep-inelastic scattering off unpolarized protons and deuterons

Author

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

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

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

Published
2013

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

Author

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

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

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

Published
2012

8. Measurements of double-spin asymmetries associated with deeply virtual Compton scattering on a transversely polarized hydrogen target

Author

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

Subjects
Nuclear and High Energy Physics, Photon, EVOLUTION KERNELS, HERA, FOS: Physical sciences, HERMES, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), GPDs, GENERALIZED PARTON DISTRIBUTIONS, 0103 physical sciences, ddc:530, NUCLEON, 010306 general physics, DVCS, GPDs, HERMES experiments, Transversely polarized hydrogen target, Physics, Quantum chromodynamics, 010308 nuclear & particles physics, Compton scattering, Transversely polarized hydrogen target, HERMES experiments, Polarization (waves), QCD, Helicity, Transverse plane, Physics and Astronomy, ELECTRON STORAGE-RING, DVCS, Nucleon
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

9. Effects of transversity in deep-inelastic scattering by polarized protons

Author

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

Subjects
Nuclear and High Energy Physics, Antiparticle, Meson, Hadron, FOS: Physical sciences, HERMES, Inelastic scattering, COLLINS, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Pion, ASYMMETRIES, LEPTOPRODUCTION, 0103 physical sciences, DISTRIBUTIONS, ddc:530, QUARKS, 010306 general physics, NUCLEON, Nuclear Experiment, Physics, 010308 nuclear & particles physics, Scattering, Collins function, Deep inelastic scattering, QCD, Polarized structure functions, TARGET, Physics and Astronomy, Single-spin asymmetries, Transversity, Antimatter, Semi-inclusive DIS, High Energy Physics::Experiment, Atomic physics
Abstract

Single-spin asymmetries for pions and charged kaons are measured in semi-inclusive deep-inelastic scattering of positrons and electrons off a transversely nuclear-polarized hydrogen target. The dependence of the cross section on the azimuthal angles of the target polarization (phi_S)and the produced hadron (phi) is found to have a substantial sin(phi+phi_S) modulation for the production of pi+, pi- and K+. This Fourier component can be interpreted in terms of non-zero transversity distribution functions and non-zero favored and disfavored Collins fragmentation functions with opposite sign. For pi0 and K- production the amplitude of this Fourier component is consistent with zero., Comment: 7 pages, 3 figures

Published
2010

10. Search for a Two-Photon Exchange Contribution to Inclusive Deep-Inelastic Scattering

Author

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

Subjects
Quark, Nuclear and High Energy Physics, Particle physics, ELECTRON-PROTON, VIOLATION, media_common.quotation_subject, DEUTERIUM, FOS: Physical sciences, Electron, 13.60.-r, 13.60.Hb, 13.88.+e, 14.20.Dh, 14.65.-q, 01 natural sciences, Asymmetry, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Positron, NUCLEON SCATTERING, 0103 physical sciences, ddc:530, EXCHANGE, 010306 general physics, Nuclear Experiment, POSITRON SCATTERING, media_common, Physics, 010308 nuclear & particles physics, Scattering, HYDROGEN, Polarization (waves), Deep inelastic scattering, INVARIANCE, TARGET, Physics and Astronomy, Deuterium, Physics::Accelerator Physics, High Energy Physics::Experiment
Abstract

The transverse-target single-spin asymmetry for inclusive deep-inelastic scattering with effectively unpolarized electron and positron beams off a transversely polarized hydrogen target was measured, with the goal of searching for a two-photon exchange signal in the kinematic range 0.007 < x_B < 0.9 and 0.25 GeV**2 < Q**2 < 20 GeV**2. In two separate regions Q**2 > 1 GeV**2 and Q**2 < 1 GeV**2, and for both electron and positron beams, the asymmetries are found to be consistent with zero within statistical and systematic uncertainties, which are of order 10**(-3) for the asymmetries integrated over x_B., 5 pages, 1 figure, revised text

Published
2009
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11. Observation of the Naive-T-odd Sivers Effect in Deep-Inelastic Scattering

Author

P. Lenisa, A. Trzcinski, P. E. Reimer, C. A. Miller, E. De Sanctis, V. Gharibyan, Franco Garibaldi, A. López Ruiz, E. Avetisyan, V. A. Korotkov, Alessandra Fantoni, M. Hoek, M. Contalbrigo, Y. Van Haarlem, L. Lagamba, Z. Akopov, G. Elbakian, D. Gabbert, Y. Salomatin, K. P. Schüler, S. I. Manaenkov, B. Q. Ma, B. Ball, C. B. Van Hulse, Frank Ellinghaus, A. Nass, E. R. Kinney, R. De Leo, H. S. Jo, B. Zihlmann, Shan Wang, Nicola Bianchi, Y. Naryshkin, R. Perez-Benito, E. Cisbani, Alexander Borissov, A. Ivanilov, W. Yu, Xianguo Lu, M. Negodaev, H. Böttcher, J. G. Rubin, M. Ehrenfried, F. Sanftl, Hasko Stenzel, S. Yen, M. Capiluppi, I. Lehmann, W. Augustyniak, J. Stewart, M. Statera, Ralf Kaiser, Andreas Mussgiller, V. A. Gapienko, A. Hillenbrand, Y. Imazu, C. Riedl, S. Yaschenko, Hengqiang Ye, M. Stancari, P. Zupranski, G. Ciullo, D. Zeiler, A. Rostomyan, A. R. Reolon, A. Avetissian, V. Bryzgalov, C. Vogel, H. E. Jackson, A. Movsisyan, N. C. R. Makins, B. Seitz, G. Gapienko, Y. Holler, Stephen V. Gliske, T. A. Shibata, Wouter Deconinck, U. Elschenbroich, Adel Terkulov, Michael Tytgat, J. J. M. Steijger, Michael Düren, P. B. van der Nat, Dirk Ryckbosch, G. Rosner, Vitaly Shutov, H. P. Blok, X. R. Lu, L. Felawka, Wolfgang Lorenzon, S. Taroian, Ivana Hristova, G. Hill, G. P. Capitani, D. Veretennikov, Salvatore Frullani, M. Hartig, P. F. Dalpiaz, R. Lamb, P. Di Nezza, F. Giordano, J. Burns, N. Akopov, K. Rith, A. Airapetian, Y. J. Mao, P. Kravchenko, M. Diefenthaler, J. Dreschler, L. De Nardo, Zhenyu Ye, E. C. Aschenauer, F. Stinzing, David Mahon, Andreas Schäfer, H. Marukyan, L. A. Linden-Levy, Cynthia Marie Hadjidakis, Y. Miyachi, D. Hasch, G. Schnell, W.-D. Nowak, L. Manfré, A. Martinez de la Ossa, L. Lapikás, Eugenio Nappi, C. Bonomo, M. Varanda, T. Keri, V. Vikhrov, Morgan Murray, I. Vilardi, B. Marianski, Arne Vandenbroucke, Riccardo Fabbri, Alessandro Bacchetta, S. Joosten, A. Kisselev, V. Kozlov, Luciano Pappalardo, (Astro)-Particles Physics, Network Institute, Student Lab and Education, and Artificial Intelligence (section level)

Subjects
Particle physics, Meson, Polarized hydrogen target, Hadron, General Physics and Astronomy, FOS: Physical sciences, Elementary particle, Parton, Inelastic scattering, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, Transverse momentum dependents, High Energy Physics - Experiment (hep-ex), Pion, 0103 physical sciences, ddc:550, 010306 general physics, Nuclear Experiment, Physics, Cross section, 010308 nuclear & particles physics, Scattering, Deep inelastic scattering, Parton distribution functions, Single-spin asymmetries, Hydrogen, Distribution functions, High Energy Physics::Experiment
Abstract

Azimuthal single-spin asymmetries of lepto-produced pions and charged kaons were measured on a transversely polarized hydrogen target. Evidence for a naive-T-odd, transverse-momentum-dependent parton distribution function is deduced from non-vanishing Sivers effects for pi+, pi0, and K+, K-, as well as in the difference of the pi+ and pi- cross sections., Comment: 6 pages, 4 figures

Published
2009

12. Nuclear-mass dependence of azimuthal beam-helicity and beam-charge asymmetries in deeply virtual Compton scattering

Author

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

Subjects
Nuclear and High Energy Physics, Particle physics, Photon, Nuclear Theory, HERA, FOS: Physical sciences, IMPACT PARAMETER SPACE, Parton, GENERALIZED PARTON DISTRIBUTIONS, SPIN, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, ddc:530, Nuclear Experiment, 010306 general physics, Physics, Elastic scattering, 010308 nuclear & particles physics, Scattering, Compton scattering, Physics::Accelerator Physics, High Energy Physics::Experiment, Nucleon, Beam (structure)
Abstract

The nuclear-mass dependence of azimuthal cross section asymmetries with respect to charge and longitudinal polarization of the lepton beam is studiedfor hard exclusive electroproduction of real photons. The observed beam-charge and beam-helicity asymmetries are attributed to the interference between the Bethe-Heitler and deeply virtual Compton scattering processes. For various nuclei, the asymmetries are extracted for both coherent and incoherent-enriched regions, which involve different (combinations of) generalized parton distributions. For both regions, the asymmetries are compared to those for a free proton, and no nuclear-mass dependence is found., Comment: 11 pages, 9 figures, 4 tables, minor revisions of text

Published
2009

13. Absence of the common crus in Goldenhar syndrome

Author

L, Manfré, P, Genuardi, M, Tortorici, and R, Lagalla

Subjects
Male, Hearing Loss, Conductive, Case Reports, Magnetic Resonance Imaging, Semicircular Canals, Hearing Loss, Bilateral, Goldenhar Syndrome, Ear, Inner, otorhinolaryngologic diseases, Humans, Abnormalities, Multiple, sense organs, Vestibule, Labyrinth, Child, Tomography, X-Ray Computed, Ear Canal, Ear Ossicles
Abstract

We describe an unusual labyrinthine malformation in a case of Goldenhar syndrome studied with CT and steady-state MR imaging. A single posterosuperior semicircular canal was found with no common crus formation. The malformation could not be attributed to any embryologic development. Nosologic considerations are discussed.

Published
1997

14. Clinical and hematological response to hydroxyurea in a patient with Hb Lepore/beta-thalassemia

Author

L. Manfré, Disma Renda, Paolo Rigano, Roberta Calzolari, Maria Concetta Renda, A. Calabrese, R. La Galla, and Aurelio Maggio

Subjects
Neurological signs, Adult, medicine.medical_specialty, Stereochemistry, Hemoglobins, Abnormal, Clinical Biochemistry, Hematological response, Butyrate, Gastroenterology, Reticulocyte Count, In vivo, hemic and lymphatic diseases, Internal medicine, Fetal hemoglobin, medicine, Humans, Hydroxyurea, Platelet, Genetics (clinical), Chromatography, High Pressure Liquid, Fetal Hemoglobin, Erythrocyte Volume, Polymorphism, Genetic, business.industry, Platelet Count, Biochemistry (medical), beta-Thalassemia, Beta thalassemia, Hematology, medicine.disease, Electrophoresis, Polyacrylamide Gel, Female, Hemoglobin, business
Abstract

The possibility of increasing Hb F in vivo using drugs like 5-azacytidine, hydroxyurea, and butyrate has been established. However, in many cases this does not entail an increase in total hemoglobin. We report on a patient with Hb Lepore/beta-thalassemia being treated with hydroxyurea (30 mg/Kg/day) because of the presence of erythroid extramedullary masses with severe neurological abnormalities. During therapy the patient showed a remarkable improvement in neurological signs due to the reduction in extra-medullary masses, a significant increase in both total hemoglobin (from 5.8 to 9.7 g/dl) and Hb F (from 4.9 g/dl to 9.1 g/dl). The marked improvement in hemoglobin level in our patient with Hb Lepore/beta-thalassemia suggests gamma-globin gene activation due to the DNA structure determined by the crossover event.

15. Percutaneous removal and replacement of a novel percutaneous interspinous device.

Author

Marcia S, Hirsch JA, Bellini M, Manfré L, Masala S, and Zini C

Subjects
Humans, Male, Aged, Middle Aged, Prostheses and Implants, Lumbar Vertebrae surgery, Device Removal methods, Device Removal instrumentation
Abstract

Objective: The aim of this study is to explain the technique used for removing and replacing a novel percutaneous interspinous device (PID). Procedure: Three male patients, with a mean age of 66 years (range 62-72), were included in the study due to displacement ( N = 2) or misplacement ( N = 1) of the novel PID. This occurred after a mean of 23.3 ± 10.5 days from the initial placement (range 13-34) at the L4-L5 level ( N = 1) and L3-L4 level ( N = 2). Following the removal of the PID, four new devices were implanted. Conclusion: The novel PID can be safely removed either immediately after its placement during the procedure or after a certain period of days or months from its implantation. The removal procedure can be performed percutaneously under imaging guidance, by closing the four retractable wings, using the same instrumentation as utilized during the initial implantation., Competing Interests: Declaration of conflicting interestsThe author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

Published
2024
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17. Feasibility, safety, and efficacy of a new percutaneous interspinous device: a retrospective multicenter study.

Author

Marcia S, Hirsch JA, Bellini M, Sadotti G, Manfré L, De Vivo AE, Piras E, Zini G, and Zini C

Subjects
Humans, Male, Aged, Female, Middle Aged, Aged, 80 and over, Retrospective Studies, Lumbar Vertebrae surgery, Lumbar Vertebrae diagnostic imaging, Tomography, X-Ray Computed, Treatment Outcome, Prostheses and Implants, Decompression, Surgical methods, Feasibility Studies, Spinal Stenosis surgery, Spinal Stenosis diagnostic imaging
Abstract

Purpose: To evaluate safety and efficacy of the novel percutaneous interspinous device (PID) for the treatment of symptomatic degenerative lumbar spinal stenosis (DLSS) in 3 different centers., Methods: From November 2016 to March 2020, 255 patients (male 125, mean age 71.2 years old range 49-91 years old) with neurogenic claudication, confirmed by electromyography, related to mono or bi-segmental lumbar central canal and/or foraminal stenosis were enrolled in the study. Magnetic resonance (MR) and/or computer tomography (CT), physical exam, and Visual Analogue Scale (VAS) and Zurich Claudication Questionnaire (ZCQ) were performed before and 6 months after the procedure. All treatments were performed under fluoroscopic guidance with local anesthesia and mild sedation. Technical success was defined as correct placement of the Lobster® (Demetrios Medical, Firenze, Italy) PID as demonstrated by computer tomography (CT) performed immediately after treatment; spinoplasty was performed in selected patients., Results: PID placement was accomplished with a 99.6% success rate (257/258). The one device that was not implanted was due to a spinous process fracture. In 28 patients, more than 1 device was implanted in the same session (max 3 PIDs); 6 patients required a second implant in different session. A total of 172 prophylactic spinoplasties were performed (59.3%). No major complications occurred; 3 device misplacements were successfully treated with percutaneous retrieval and new device deployment. 99.6% of patients experienced clinical improvement., Conclusion: Lobster PID is an effective and safe minimally invasive decompression method for central canal and neural foraminal stenosis when patients are correctly selected., (© 2024. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)

Published
2024
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18. Vertebral Augmentation: Is It Time to Get Past the Pain? A Consensus Statement from the Sardinia Spine and Stroke Congress.

Author

Hirsch JA, Zini C, Anselmetti GC, Ardura F, Beall D, Bellini M, Brook A, Cianfoni A, Clerk-Lamalice O, Georgy B, Maestretti G, Manfré L, Muto M, Ortiz O, Saba L, Kelekis A, Filippiadis DK, Marcia S, and Masala S

Subjects
Humans, Pain, Treatment Outcome, Fractures, Compression surgery, Vertebroplasty, Spinal Fractures surgery, Stroke
Abstract

Vertebral augmentation has been used to treat painful vertebral compression fractures and metastatic lesions in millions of patients around the world. An international group of subject matter experts have considered the evidence, including but not limited to mortality. These considerations led them to ask whether it is appropriate to allow the subjective measure of pain to so dominate the clinical decision of whether to proceed with augmentation. The discussions that ensued are related below.

Published
2022
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19. Clinical and radiological outcomes following insertion of a novel removable percutaneous interspinous process spacer: an initial experience.

Author

Pavan LJ, Dalili D, De Vivo AE, Hamel-Senecal A, Torre F, Rudel A, Manfré L, and Amoretti N

Subjects
Aged, Aged, 80 and over, Decompression, Surgical methods, Female, Follow-Up Studies, Humans, Lumbar Vertebrae diagnostic imaging, Lumbar Vertebrae surgery, Male, Middle Aged, Pain complications, Pain surgery, Prostheses and Implants, Reproducibility of Results, Treatment Outcome, Spinal Stenosis diagnostic imaging, Spinal Stenosis surgery
Abstract

Purpose: To evaluate clinical and radiological outcomes of a series of patients treated with a removable percutaneous interspinous process spacer (IPS) (LobsterProject® Techlamed®) for symptomatic degenerative lumbar spinal stenosis (DLSS)., Methods: All patients treated in two centres with this IPS during 2019 were retrospectively reviewed. Procedures were performed under deep sedation or general anaesthesia by two interventional radiologists. Patients were clinically evaluated before intervention and at 3-month follow-up with Visual Analog Scales for pain (VAS), Oswestry Disability Index (ODI) and radiologically with MRI or CT scans. Neural foramina were independently measured for each patient on pre- and post-procedural CT scans by two radiologists., Results: Fifty-nine patients were treated in the selected period of which fifty-eight had complete documentation (mean age 71.2 ± 9.2 years [55-92], 32 males, 26 females). Forty-eight interventions were performed under deep sedation and ten under general anaesthesia, without procedural complications. Clinical follow-up at 3 months showed a significant reduction of pain (VAS from 83 ± 9 to 29 ± 19, - 65%; p < 0.001) and an improvement in functional outcomes (ODI from 31 ± 12 to 13 ± 10%, - 58%; p < 0.001). There was one case of unsatisfactory positioning post procedure, two cases of posterior migration at 3-month follow-up and one case of spinous process fracture. Mean neural foramina area increased from 77 ± 23 to 95 ± 27 mm 2 (+ 26%; p < 0.001) with very good inter-observer reliability (Cronbach's alpha = 0.899)., Conclusion: Percutaneous minimally invasive insertion of a removable IPS device demonstrates a favourable safety profile, good clinical outcomes at 3 months, and apparent anatomical increase in foraminal dimensions., Trial Registration: ClinicalTrials.gov Identifier: NCT05203666-Release Date: 21 st January 2022, retrospectively registered., (© 2022. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)

Published
2022
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20. Percutaneous Sacroiliac Joint Fixation in Sacroiliac Instability. The First Case Report Using a Fully CT-Guided Technique.

Author

Manfré L

Subjects
Female, Humans, Low Back Pain etiology, Low Back Pain surgery, Middle Aged, Sciatica etiology, Treatment Outcome, Fracture Fixation methods, Internal Fixators, Joint Instability diagnostic imaging, Joint Instability surgery, Sacroiliac Joint diagnostic imaging, Sacroiliac Joint surgery, Surgery, Computer-Assisted methods, Tomography, X-Ray Computed methods
Abstract

The prevalence of sacroiliac Joint (SIJ) disease as a cause of LBP is considered to range from 21% to 25%. Nevertheless, SIJ instability is frequently underestimated. Although conventional surgery has been used for several years in an attempt to stabilize the SIJ, a new percutaneous system has been proposed for articular fusion. Recently a new "one-step" fixation procedure has been proposed. We describe the case of a patient with painful SIJ instability treated with a fully CT-guided technique in simple analogue sedation.

Published
2014
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21. CT-Guided Transfacet Pedicle Screw Fixation in Facet Joint Syndrome: A Novel Approach.

Author

Manfré L

Subjects
Arthrodesis, Follow-Up Studies, Humans, Low Back Pain etiology, Minimally Invasive Surgical Procedures, Pulsed Radiofrequency Treatment, Syndrome, Tomography, X-Ray Computed, Treatment Outcome, Atlanto-Axial Joint, Internal Fixators, Intervertebral Disc Degeneration complications, Intervertebral Disc Degeneration surgery, Joint Instability etiology, Joint Instability surgery, Pedicle Screws, Surgery, Computer-Assisted methods, Zygapophyseal Joint diagnostic imaging, Zygapophyseal Joint surgery
Abstract

Axial microinstability secondary to disc degeneration and consequent chronic facet joint syndrome (CFJS) is a well-known pathological entity, usually responsible for low back pain (LBP). Although posterior lumbar fixation (PIF) has been widely used for lumbar spine instability and LBP, complications related to wrong screw introduction, perineural scars and extensive muscle dissection leading to muscle dysfunction have been described. Radiofrequency ablation (RFA) of facet joints zygapophyseal nerves conventionally used for pain treatment fails in approximately 21% of patients. We investigated a "covert-surgery" minimal invasive technique to treat local spinal instability and LBP, using a novel fully CT-guided approach in patients with axial instability complicated by CFJS resistant to radioablation, by introducing direct fully or partially threaded transfacet screws (transfacet fixation - TFF), to acquire solid arthrodesis, reducing instability and LBP. The CT-guided procedure was well tolerated by all patients in simple analogue sedation, and mean operative time was approximately 45 minutes. All eight patients treated underwent clinical and CT study follow-up at two months, revealing LBP disappearance in six patients, and a significant reduction of lumbar pain in two. In conclusion, CT-guided TFF is a fast and safe technique when facet posterior fixation is needed.

Published
2014
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22. Posterior Arch Augmentation (Spinoplasty) before and after Single and Double Interspinous Spacer Introduction at the Same Level: Preventing and Treating the Failure?

Author

Manfré L

Subjects
Aged, Aged, 80 and over, Bone Cements, Bone Remodeling, Female, Follow-Up Studies, Humans, Low Back Pain etiology, Low Back Pain surgery, Male, Middle Aged, Osteoporosis complications, Pain Measurement, Polymethyl Methacrylate, Postoperative Complications epidemiology, Recurrence, Surgery, Computer-Assisted, Treatment Outcome, Internal Fixators, Lumbosacral Region surgery, Orthopedic Procedures methods, Spinal Stenosis surgery
Abstract

Lumbar spinal canal stenosis (LSCS) is one of the most common degenerative diseases in elderly patients. Failure of he treatment can occur, generally related to bone remodelling/fracture of spinous processes. PMMA augmentation of the posterior arch (spinoplasty, SP) has recently been proposed in case of neoplastic involvement. This study evaluated the efficacy of SP as a prophylactic treatment before introducing an interspinous spacer (IS). Moreover, we consider the possibility to treat patients who previously underwent IS implants with subsequent failure of the device, by introducing a second spacer at the same level, performing accessory SP. From January 2009 to September 2011, 174 patients with LSCS underwent CT-guided percutaneous IS implant in our department. From January 2011, all patients with osteoporosis underwent prophylactic SP before introducing the spacer. Moreover, in patients with re-stenosis related to bone remodelling and/or fracture, after strengthening the spinous processes with PMMA introduction, a second similar device was introduced to re-open the stenotic spinal canal. In patients with prophylactic treatment before spacer introduction, no restenosis occurred at three to 12 month follow-up. Patients who underwent second spacer implant at the same level after posterior arch augmentation again obtained a resolution of symptoms, and no further bone remodelling had occurred at follow-up controls. In conclusion, prophylactic SP prevents single spacer failure for bone remodelling/fracture, and allows failure repair by introducing a second spacer at the same level.

Published
2014
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23. CT-Guided Posterior Lumbar Interbody Fusion and Distraction. A Case Report.

Author

Manfré L

Abstract

We performed CT-guided posterior interbody fusion (PIF) with pedicle screw fixation and distraction to treat degenerative lumbar L4-L5 spondylolisthesis with severe left sciatica. The patient was suffering from L4 nerve root compression related to neural foramina stenosis. The dedicated tools to perform a CT-guided percutaneous PIF technique are described. The procedure was easy to apply with a total surgical time of 90 minutes. The neural foramina were investigated by CT scan reconstruction on sagittal plane demonstrating marked widening after PIF application. The left leg pain completely disappeared in two weeks and the patient remained painless at the three month follow-up control. To our knowledge, there are no other papers on CT-guided PIF procedure in the literature.

Published
2011
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24. Observation of the naive-T-odd Sivers effect in deep-inelastic scattering.

Author

Airapetian A, Akopov N, Akopov Z, Aschenauer EC, Augustyniak W, Avetissian A, Avetisyan E, Bacchetta A, Ball B, Bianchi N, Blok HP, Böttcher H, Bonomo C, Borissov A, Bryzgalov V, Burns J, Capiluppi M, Capitani GP, Cisbani E, Ciullo G, Contalbrigo M, Dalpiaz PF, Deconinck W, De Leo R, De Nardo L, De Sanctis E, Diefenthaler M, Di Nezza P, Dreschler J, Düren M, Ehrenfried M, Elbakian G, Ellinghaus F, Elschenbroich U, Fabbri R, Fantoni A, Felawka L, Frullani S, Gabbert D, Gapienko G, Gapienko V, Garibaldi F, Gharibyan V, Giordano F, Gliske S, Hadjidakis C, Hartig M, Hasch D, Hill G, Hillenbrand A, Hoek M, Holler Y, Hristova I, Imazu Y, Ivanilov A, Jackson HE, Jo HS, Joosten S, Kaiser R, Keri T, Kinney E, Kisselev A, Korotkov V, Kozlov V, Kravchenko P, Lagamba L, Lamb R, Lapikás L, Lehmann I, Lenisa P, Linden-Levy LA, López Ruiz A, Lorenzon W, Lu XG, Lu XR, Ma BQ, Mahon D, Makins NC, Manaenkov SI, Manfré L, Mao Y, Marianski B, Martinez de la Ossa A, Marukyan H, Miller CA, Miyachi Y, Movsisyan A, Murray M, Mussgiller A, Nappi E, Naryshkin Y, Nass A, Negodaev M, Nowak WD, Pappalardo LL, Perez-Benito R, Reimer PE, Reolon AR, Riedl C, Rith K, Rosner G, Rostomyan A, Rubin J, Ryckbosch D, Salomatin Y, Sanftl F, Schäfer A, Schnell G, Schüler KP, Seitz B, Shibata TA, Shutov V, Stancari M, Statera M, Steijger JJ, Stenzel H, Stewart J, Stinzing F, Taroian S, Terkulov A, Trzcinski A, Tytgat M, Vandenbroucke A, van der Nat PB, Van Haarlem Y, Van Hulse C, Varanda M, Veretennikov D, Vikhrov V, Vilardi I, Vogel C, Wang S, Yaschenko S, Ye H, Ye Z, Yen S, Yu W, Zeiler D, Zihlmann B, and Zupranski P

Abstract

Azimuthal single-spin asymmetries of leptoproduced pions and charged kaons were measured on a transversely polarized hydrogen target. Evidence for a naive-T-odd, transverse-momentum-dependent parton distribution function is deduced from nonvanishing Sivers effects for pi(+), pi(0), and K(+/-), as well as in the difference of the pi(+) and pi(-) cross sections.

Published
2009
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25. Septo-optic dysplasia complex: a heterogeneous malformation syndrome.

Author

Polizzi A, Pavone P, Iannetti P, Manfré L, and Ruggieri M

Subjects
Adolescent, Child, Child, Preschool, Female, Humans, Male, Prospective Studies, Retrospective Studies, Abnormalities, Multiple genetics, Abnormalities, Multiple pathology, Brain pathology, Homeodomain Proteins genetics, Septo-Optic Dysplasia genetics, Septo-Optic Dysplasia pathology
Abstract

Septo-optic dysplasia is defined by a variable combination of dysgenesis of midline brain structures including optic nerve hypoplasia and hypothalamic-pituitary dysfunction often associated with a wide variety of brain malformations of cortical development. Multiple congenital anomalies have been reported only sporadically. Despite recent demonstration of the possible pathogenic role of HESX1/Hesx1 gene (a homeobox gene important for development of prosencephalon), the etiology of most cases of septo-optic dysplasia still remains unclear. This report describes eight children (4 males, 4 females; age 2 to 17 years) with septo-optic dysplasia who manifested dysmorphic features (involving not only the midline facial structures) and a spectrum of additional clinical and imaging features including autism, facial hemangioma, and holoprosencephaly. Full mutational screening for the HESX1 gene in seven of eight children was negative. Based on the extreme variability of the clinical and imaging phenotypes hereby observed, on literature review, and on septo-optic dysplasia animal models, this study confirmed that the phenotypic heterogeneity in septo-optic dysplasia is high. We suggest that: (1) dysmorphic features are more frequent than previously thought--they may represent a relevant part of the phenotype; (2) septo-optic dysplasia should be recategorized as an heterogeneous malformation syndrome (septo-optic dysplasia complex) (encompassing multiple brain, endocrine, and systemic anomalies) rather than a single precisely defined entity.

Published
2006
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26. Perfusion MRI in normal and abnormal pituitary gland. A preliminary study.

Author

Manfré L, Midiri M, Rosato F, Janni A, and Lagalla R

Subjects
Adenoma diagnosis, Contrast Media, Diagnosis, Differential, Female, Gadolinium DTPA, Humans, Image Processing, Computer-Assisted, Male, Pituitary Diseases diagnosis, Pituitary Neoplasms diagnosis, Prolactinoma diagnosis, Reference Values, Regional Blood Flow physiology, Adenoma blood supply, Adrenocorticotropic Hormone metabolism, Magnetic Resonance Imaging methods, Pituitary Gland blood supply, Pituitary Neoplasms blood supply, Prolactinoma blood supply
Abstract

Perfusion MRI (magnetic resonance imaging) of the pituitary gland was performed in 20 healthy volunteers and 63 patients with various lesions involving the pituitary gland. All patients underwent sequential contrast-enhanced MRI using spoiled gradient recalled sequences with high temporal resolution (7 seconds). Four pituitary areas (pituitary stalk, posterior lobe, postero-superior, and antero-inferior adenohypophysis) were tested with a selected region of interest. Maximal contrast percentual variation was calculated. The timing of enhancement in normal patients matched perfectly with normal pituitary vascularization. Abnormal timing in pathological condition was investigated.

Published
1997
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27. Clinical and hematological response to hydroxyurea in a patient with Hb Lepore/beta-thalassemia.

Author

Rigano P, Manfré L, La Galla R, Renda D, Renda MC, Calabrese A, Calzolari R, and Maggio A

Subjects
Adult, Chromatography, High Pressure Liquid, Electrophoresis, Polyacrylamide Gel, Erythrocyte Volume drug effects, Female, Fetal Hemoglobin biosynthesis, Fetal Hemoglobin chemistry, Hemoglobins, Abnormal drug effects, Hemoglobins, Abnormal physiology, Humans, Hydroxyurea therapeutic use, Platelet Count, Polymorphism, Genetic, Reticulocyte Count, beta-Thalassemia drug therapy, Hemoglobins, Abnormal chemistry, Hydroxyurea pharmacology, beta-Thalassemia blood
Abstract

The possibility of increasing Hb F in vivo using drugs like 5-azacytidine, hydroxyurea, and butyrate has been established. However, in many cases this does not entail an increase in total hemoglobin. We report on a patient with Hb Lepore/beta-thalassemia being treated with hydroxyurea (30 mg/Kg/day) because of the presence of erythroid extramedullary masses with severe neurological abnormalities. During therapy the patient showed a remarkable improvement in neurological signs due to the reduction in extra-medullary masses, a significant increase in both total hemoglobin (from 5.8 to 9.7 g/dl) and Hb F (from 4.9 g/dl to 9.1 g/dl). The marked improvement in hemoglobin level in our patient with Hb Lepore/beta-thalassemia suggests gamma-globin gene activation due to the DNA structure determined by the crossover event.

Published
1997
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28. Absence of the common crus in Goldenhar syndrome.

Author

Manfré L, Genuardi P, Tortorici M, and Lagalla R

Subjects
Abnormalities, Multiple, Child, Ear Canal abnormalities, Ear Ossicles abnormalities, Ear, Inner abnormalities, Goldenhar Syndrome diagnostic imaging, Hearing Loss, Bilateral diagnosis, Hearing Loss, Bilateral diagnostic imaging, Hearing Loss, Conductive diagnosis, Hearing Loss, Conductive diagnostic imaging, Humans, Magnetic Resonance Imaging, Male, Tomography, X-Ray Computed, Vestibule, Labyrinth abnormalities, Goldenhar Syndrome diagnosis, Semicircular Canals abnormalities
Abstract

We describe an unusual labyrinthine malformation in a case of Goldenhar syndrome studied with CT and steady-state MR imaging. A single posterosuperior semicircular canal was found with no common crus formation. The malformation could not be attributed to any embryologic development. Nosologic considerations are discussed.

Published
1997

29. Blood-ocular barrier damage: use of contrast-enhanced MRI.

Author

Manfré L, Midiri M, Giuffré G, Mangiameli A, Cardella G, Ponte F, De Maria M, and Lagalla R

Subjects
Adult, Aged, Aqueous Humor, Contrast Media, Eye Diseases etiology, Female, Fluorescein Angiography, Follow-Up Studies, Fundus Oculi, Gadolinium, Gadolinium DTPA, Humans, Male, Middle Aged, Vitreous Body pathology, Blood-Aqueous Barrier, Blood-Retinal Barrier, Capillary Permeability, Eye Diseases diagnosis, Magnetic Resonance Imaging methods, Organometallic Compounds, Pentetic Acid analogs & derivatives
Abstract

The blood-ocular barrier (BOB) shares similar neuroepithelial origin, microanatomy and functions with the blood-brain barrier. There are many natural (e. g. diabetes, hypertension) or iatrogenic (chemotherapy, retinal photocoagulation) conditions which can cause a BOB breakdown, resulting in visual acuity impairment or loss. The authors examined 42 patients affected by BOB damage in different pathological conditions. All patients previously underwent a conventional fluoroangiographic (FA) study. Nine patients with normal FA exam were evaluated also. Despite normal MRI findings immediately after Gd-DTPA injection, contrast leakage into the vitreous body or into the aqueous fluid was demonstrated in delayed scans (40-50 min after contrast administration), proving the existence of a BOB damage (sensitively 94 %). Although FA exam remains the choice modality in BOB breakdown demonstration, we propose MRI as a useful diagnostic tool when optic media opacity (cataract, haemovitreous, intraocular silicon oil) occurs, preventing direct retinal fundus imaging and/or an early screening tool.

Published
1997
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30. Idiopathic intracranial hypertension: orbital MRI.

Author

Manfré L, Lagalla R, Mangiameli A, Lupo F, Giuffré G, Ponte F, and Cardinale AE

Subjects
Adult, Blood-Retinal Barrier physiology, Cerebrospinal Fluid Pressure physiology, Humans, Intracranial Pressure physiology, Male, Optic Disk blood supply, Optic Disk pathology, Orbit blood supply, Magnetic Resonance Imaging, Orbit pathology, Pseudotumor Cerebri etiology
Abstract

The case is reported of a patient with idiopathic intracranial hypertension examined with magnetic resonance imaging. Marked enhancement of the optic nerve heads was found, which might be related to blood-retinal barrier breakdown related to a sudden rise in intracranial cerebrospinal fluid pressure.

Published
1995
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