H.P. Blok

Single-spin asymmetries in semi-inclusive deep-inelastic scattering on a transversely polarized hydrogen target

Single-spin asymmetries for semi-inclusive electroproduction of charged pions in deep-inelastic scattering of positrons are measured for the first time with transverse target polarization. The asymmetry depends on the azimuthal angles of both the pion (

Observation of the Naive-T-odd Sivers Effect in Deep-Inelastic Scattering

\phi

Measurements of electron-proton elastic cross sections for 0.4 < Q(2) < 5.5 (GeV/c)(2)

) and the target spin axis (

A consistent analysis of (e,e′p) and (d,3He) experiments

\phi_S

Evidence for a Transverse Single-Spin Asymmetry in Leptoproduction of pi+pi- Pairs

) about the virtual photon direction and relative to the lepton scattering plane. The extracted Fourier component

Proton ground-state correlations in 40Ca studied with the reaction 40Ca(e, e′ p)49K

\cmpi

Cross-sections for hard exclusive electroproduction of pi+ mesons on a hydrogen target

is a signal of the previously unmeasured quark transversity distribution, in conjunction with the so-called Collins fragmentation function, also unknown. The Fourier component

Q(2) dependence of nuclear transparency for exclusive rho(0) production

\smpi

Transverse momentum dependence of semi-inclusive pion production

of the asymmetry arises from a correlation between the transverse polarization of the target nucleon and the intrinsic transverse momentum of quarks, as represented by the previously unmeasured Sivers distribution function. Evidence for both signals is observed, but the Sivers asymmetry may be affected by exclusive vector meson production

Subleading-twist effects in single-spin asymmetries in semi-inclusive deep-inelastic scattering on a longitudinally polarized hydrogen target

A. Airapetian, 15 N. Akopov, Z. Akopov, E.C. Aschenauer, W. Augustyniak, A. Avetissian, E. Avetisyan, A. Bacchetta, B. Ball, N. Bianchi, H.P. Blok, 24 H. Böttcher, C. Bonomo, A. Borissov, V. Bryzgalov, J. Burns, M. Capiluppi, G.P. Capitani, E. Cisbani, G. Ciullo, M. Contalbrigo, P.F. Dalpiaz, W. Deconinck, 15 R. De Leo, L. De Nardo, 5 E. De Sanctis, M. Diefenthaler, 8 P. Di Nezza, J. Dreschler, M. Düren, M. Ehrenfried, G. Elbakian, F. Ellinghaus, U. Elschenbroich, R. Fabbri, A. Fantoni, L. Felawka, S. Frullani, D. Gabbert, G. Gapienko, V. Gapienko, F. Garibaldi, V. Gharibyan, F. Giordano, 9 S. Gliske, 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, 11 R. Kaiser, T. Keri, 12 E. Kinney, A. Kisselev, V. Korotkov, V. Kozlov, P. Kravchenko, 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, M. Murray, A. Mussgiller, 8 E. Nappi, Y. Naryshkin, A. Nass, M. Negodaev, W.-D. Nowak, L.L. Pappalardo, R. Perez-Benito, 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, 11 K.P. Schüler, B. Seitz, T.-A. Shibata, V. Shutov, M. Stancari, M. Statera, J.J.M. Steijger, H. Stenzel, J. Stewart, F. Stinzing, S. Taroian, A. Terkulov, A. Trzcinski, M. Tytgat, A. Vandenbroucke, P.B. van der Nat, Y. Van Haarlem, C. Van Hulse, M. Varanda, D. Veretennikov, V. Vikhrov, I. Vilardi, C. Vogel, S. Wang, S. Yaschenko, 8 H. Ye, Z. Ye, S. Yen, W. Yu, D. Zeiler, B. Zihlmann, and P. Zupranski