Single-spin azimuthal asymmetry in exclusive electroproduction of π + mesons

A. Airapetian; N. Akopov; Z. Akopov; M. Amarian; E. C. Aschenauer; H. Avakian; R. Avakian; A. Avetissian; E. Avetissian; P. Bailey; V. Baturin; C. Baumgarten; M. Beckmann; S. Belostotski; S. Bernreuther; N. Bianchi; H. Böttcher; A. Borissov; O. Bouhali; M. Bouwhuis; J. Brack; S. Brauksiepe; A. Brüll; I. Brunn; H. J. Bulten; G. P. Capitani; P. Chumney; E. Cisbani; G. Ciullo; G. R. Court; P. F. Dalpiaz; R. De Leo; L. De Nardo; E. De Sanctis; D. De Schepper; E. Devitsin; P. K.A. de Witt Huberts; P. Di Nezza; M. Düren; M. Ehrenfried; G. Elbakian; F. Ellinghaus; J. Ely; R. Fabbri; A. Fantoni; A. Fechtchenko; L. Felawka; B. W. Filippone; H. Fischer; B. Fox; J. Franz; S. Frullani; Y. Gärber; F. Garibaldi; E. Garutti; G. Gavrilov; V. Gharibyan; G. Graw; O. Grebeniouk; P. W. Green; L. G. Greeniaus; A. Gute; W. Haeberli; K. Hafidi; M. Hartig; D. Hasch; D. Heesbeen; F. H. Heinsius; M. Henoch; R. Hertenberger; W. H.A. Hesselink; G. Hofman; Y. Holler; R. J. Holt; B. Hommez; G. Iarygin; A. Izotov; H. E. Jackson; A. Jgoun; P. Jung; R. Kaiser; A. Kisselev; P. Kitching; K. Königsmann; H. Kolster; V. Korotkov; E. Kotik; V. Kozlov; B. Krauss; V. G. Krivokhijine; G. Kyle; L. Lagamba; A. Laziev; P. Lenisa; P. Liebing; T. Lindemann; W. Lorenzon; A. Maas; N. C.R. Makins; H. Marukyan; F. Masoli; K. McIlhany; F. Meissner; F. Menden; V. Mexner; N. Meyners; O. Mikloukho; R. Milner; V. Muccifora; A. Nagaitsev; E. Nappi; Y. Naryshkin; A. Nass; K. Negodaeva; W. D. Nowak; K. Oganessyan; T. G. O'Neill; B. R. Owen; S. F. Pate; S. Podiatchev; S. Potashov; D. H. Potterveld; M. Raithel; G. Rakness; V. Rappoport; R. Redwine; D. Reggiani; P. Reimer; A. R. Reolon; K. Rith; D. Robinson; A. Rostomyan; D. Ryckbosch; Y. Sakemi; I. Sanjiev; F. Sato; I. Savin; C. Scarlett; A. Schäfer; C. Schill; F. Schmidt; G. Schnell; K. P. Schüler; A. Schwind; J. Seibert; B. Seitz; T. A. Shibata; V. Shutov; M. C. Simani; A. Simon; K. Sinram; E. Steffens; J. J.M. Steijger; J. Stewart; U. Stösslein; K. Suetsugu; S. Taroian; A. Terkulov; S. Tessarin; E. Thomas; B. Tipton; M. Tytgat; G. M. Urciuoli; J. F.J. van den Brand; G. van der Steenhoven; R. van de Vyver; M. C. Vetterli; V. Vikhrov; M. G. Vincter; J. Visser; J. Volmer; C. Weiskopf; J. Wendland; J. Wilbert; T. Wise; S. Yen; S. Yoneyama; H. Zohrabian

doi:10.1016/S0370-2693(02)01780-X

Single-spin azimuthal asymmetry in exclusive electroproduction of π ⁺ mesons

A. Airapetian, N. Akopov, Z. Akopov, M. Amarian, E. C. Aschenauer, H. Avakian, R. Avakian, A. Avetissian, E. Avetissian, P. Bailey, V. Baturin, C. Baumgarten, M. Beckmann, S. Belostotski, S. Bernreuther, N. Bianchi, H. Böttcher, A. Borissov, O. Bouhali, M. BouwhuisJ. Brack, S. Brauksiepe, A. Brüll, I. Brunn, H. J. Bulten, G. P. Capitani, P. Chumney, E. Cisbani, G. Ciullo, G. R. Court, P. F. Dalpiaz, R. De Leo, L. De Nardo, E. De Sanctis, D. De Schepper, E. Devitsin, P. K.A. de Witt Huberts, P. Di Nezza, M. Düren, M. Ehrenfried, G. Elbakian, F. Ellinghaus, J. Ely, R. Fabbri, A. Fantoni, A. Fechtchenko, L. Felawka, B. W. Filippone, H. Fischer, B. Fox, J. Franz, S. Frullani, Y. Gärber, F. Garibaldi, E. Garutti, G. Gavrilov, V. Gharibyan, G. Graw, O. Grebeniouk, P. W. Green, L. G. Greeniaus, A. Gute, W. Haeberli, K. Hafidi, M. Hartig, D. Hasch, D. Heesbeen, F. H. Heinsius, M. Henoch, R. Hertenberger, W. H.A. Hesselink, G. Hofman, Y. Holler, R. J. Holt, B. Hommez, G. Iarygin, A. Izotov, H. E. Jackson, A. Jgoun, P. Jung, R. Kaiser, A. Kisselev, P. Kitching, K. Königsmann, H. Kolster, V. Korotkov, E. Kotik, V. Kozlov, B. Krauss, V. G. Krivokhijine, G. Kyle, L. Lagamba, A. Laziev, P. Lenisa, P. Liebing, T. Lindemann, W. Lorenzon, A. Maas, N. C.R. Makins, H. Marukyan, F. Masoli, K. McIlhany, F. Meissner, F. Menden, V. Mexner, N. Meyners, O. Mikloukho, R. Milner, V. Muccifora, A. Nagaitsev, E. Nappi, Y. Naryshkin, A. Nass, K. Negodaeva, W. D. Nowak, K. Oganessyan, T. G. O'Neill, B. R. Owen, S. F. Pate, S. Podiatchev, S. Potashov, D. H. Potterveld, M. Raithel, G. Rakness, V. Rappoport, R. Redwine, D. Reggiani, P. Reimer, A. R. Reolon, K. Rith, D. Robinson, A. Rostomyan, D. Ryckbosch, Y. Sakemi, I. Sanjiev, F. Sato, I. Savin, C. Scarlett, A. Schäfer, C. Schill, F. Schmidt, G. Schnell, K. P. Schüler, A. Schwind, J. Seibert, B. Seitz, T. A. Shibata, V. Shutov, M. C. Simani, A. Simon, K. Sinram, E. Steffens, J. J.M. Steijger, J. Stewart, U. Stösslein, K. Suetsugu, S. Taroian, A. Terkulov, S. Tessarin, E. Thomas, B. Tipton, M. Tytgat, G. M. Urciuoli, J. F.J. van den Brand, G. van der Steenhoven, R. van de Vyver, M. C. Vetterli, V. Vikhrov, M. G. Vincter, J. Visser, J. Volmer, C. Weiskopf, J. Wendland, J. Wilbert, T. Wise, S. Yen, S. Yoneyama, H. Zohrabian

Research output: Contribution to journal › Article › peer-review

Abstract

A single-spin asymmetry in the distribution of exclusively produced π ⁺ mesons azimuthally around the virtual photon direction relative to the lepton scattering plane has been measured for the first time in deep-inelastic scattering of positrons off longitudinally polarized protons. Integrated over the experimental acceptance, the sin moment of the polarization asymmetry of the cross section is measured to be -0.18 ± 0.05(stat.) ± 0.02(syst.). The asymmetry is also studied as a function of the relevant kinematic variables, and its magnitude is found to grow with decreasing x and increasing -t and vanish at t → t _min (where x is the Bjorken scaling variable and t is the squared four-momentum transferred to the nucleon).

Original language	English (US)
Pages (from-to)	85-92
Number of pages	8
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	535
Issue number	1-4
DOIs	https://doi.org/10.1016/S0370-2693(02)01780-X
State	Published - May 23 2002
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1016/S0370-2693(02)01780-X

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Airapetian, A., Akopov, N., Akopov, Z., Amarian, M., Aschenauer, E. C., Avakian, H., Avakian, R., Avetissian, A., Avetissian, E., Bailey, P., Baturin, V., Baumgarten, C., Beckmann, M., Belostotski, S., Bernreuther, S., Bianchi, N., Böttcher, H., Borissov, A., Bouhali, O., ... Zohrabian, H. (2002). Single-spin azimuthal asymmetry in exclusive electroproduction of π ⁺ mesons. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 535(1-4), 85-92. https://doi.org/10.1016/S0370-2693(02)01780-X

Airapetian, A, Akopov, N, Akopov, Z, Amarian, M, Aschenauer, EC, Avakian, H, Avakian, R, Avetissian, A, Avetissian, E, Bailey, P, Baturin, V, Baumgarten, C, Beckmann, M, Belostotski, S, Bernreuther, S, Bianchi, N, Böttcher, H, Borissov, A, Bouhali, O, Bouwhuis, M, Brack, J, Brauksiepe, S, Brüll, A, Brunn, I, Bulten, HJ, Capitani, GP, Chumney, P, Cisbani, E, Ciullo, G, Court, GR, Dalpiaz, PF, De Leo, R, De Nardo, L, De Sanctis, E, De Schepper, D, Devitsin, E, de Witt Huberts, PKA, Di Nezza, P, Düren, M, Ehrenfried, M, Elbakian, G, Ellinghaus, F, Ely, J, Fabbri, R, Fantoni, A, Fechtchenko, A, Felawka, L, Filippone, BW, Fischer, H, Fox, B, Franz, J, Frullani, S, Gärber, Y, Garibaldi, F, Garutti, E, Gavrilov, G, Gharibyan, V, Graw, G, Grebeniouk, O, Green, PW, Greeniaus, LG, Gute, A, Haeberli, W, Hafidi, K, Hartig, M, Hasch, D, Heesbeen, D, Heinsius, FH, Henoch, M, Hertenberger, R, Hesselink, WHA, Hofman, G, Holler, Y, Holt, RJ, Hommez, B, Iarygin, G, Izotov, A, Jackson, HE, Jgoun, A, Jung, P, Kaiser, R, Kisselev, A, Kitching, P, Königsmann, K, Kolster, H, Korotkov, V, Kotik, E, Kozlov, V, Krauss, B, Krivokhijine, VG, Kyle, G, Lagamba, L, Laziev, A, Lenisa, P, Liebing, P, Lindemann, T, Lorenzon, W, Maas, A, Makins, NCR, Marukyan, H, Masoli, F, McIlhany, K, Meissner, F, Menden, F, Mexner, V, Meyners, N, Mikloukho, O, Milner, R, Muccifora, V, Nagaitsev, A, Nappi, E, Naryshkin, Y, Nass, A, Negodaeva, K, Nowak, WD, Oganessyan, K, O'Neill, TG, Owen, BR, Pate, SF, Podiatchev, S, Potashov, S, Potterveld, DH, Raithel, M, Rakness, G, Rappoport, V, Redwine, R, Reggiani, D, Reimer, P, Reolon, AR, Rith, K, Robinson, D, Rostomyan, A, Ryckbosch, D, Sakemi, Y, Sanjiev, I, Sato, F, Savin, I, Scarlett, C, Schäfer, A, Schill, C, Schmidt, F, Schnell, G, Schüler, KP, Schwind, A, Seibert, J, Seitz, B, Shibata, TA, Shutov, V, Simani, MC, Simon, A, Sinram, K, Steffens, E, Steijger, JJM, Stewart, J, Stösslein, U, Suetsugu, K, Taroian, S, Terkulov, A, Tessarin, S, Thomas, E, Tipton, B, Tytgat, M, Urciuoli, GM, van den Brand, JFJ, van der Steenhoven, G, van de Vyver, R, Vetterli, MC, Vikhrov, V, Vincter, MG, Visser, J, Volmer, J, Weiskopf, C, Wendland, J, Wilbert, J, Wise, T, Yen, S, Yoneyama, S & Zohrabian, H 2002, 'Single-spin azimuthal asymmetry in exclusive electroproduction of π ⁺ mesons', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 535, no. 1-4, pp. 85-92. https://doi.org/10.1016/S0370-2693(02)01780-X

@article{ce6fe455bee04a0db39eb464752d2b02,

title = "Single-spin azimuthal asymmetry in exclusive electroproduction of π + mesons",

abstract = "A single-spin asymmetry in the distribution of exclusively produced π + mesons azimuthally around the virtual photon direction relative to the lepton scattering plane has been measured for the first time in deep-inelastic scattering of positrons off longitudinally polarized protons. Integrated over the experimental acceptance, the sin moment of the polarization asymmetry of the cross section is measured to be -0.18 ± 0.05(stat.) ± 0.02(syst.). The asymmetry is also studied as a function of the relevant kinematic variables, and its magnitude is found to grow with decreasing x and increasing -t and vanish at t → t min (where x is the Bjorken scaling variable and t is the squared four-momentum transferred to the nucleon).",

author = "A. Airapetian and N. Akopov and Z. Akopov and M. Amarian and Aschenauer, {E. C.} and H. Avakian and R. Avakian and A. Avetissian and E. Avetissian and P. Bailey and V. Baturin and C. Baumgarten and M. Beckmann and S. Belostotski and S. Bernreuther and N. Bianchi and H. B{\"o}ttcher and A. Borissov and O. Bouhali and M. Bouwhuis and J. Brack and S. Brauksiepe and A. Br{\"u}ll and I. Brunn and Bulten, {H. J.} and Capitani, {G. P.} and P. Chumney and E. Cisbani and G. Ciullo and Court, {G. R.} and Dalpiaz, {P. F.} and {De Leo}, R. and {De Nardo}, L. and {De Sanctis}, E. and {De Schepper}, D. and E. Devitsin and {de Witt Huberts}, {P. K.A.} and {Di Nezza}, P. and M. D{\"u}ren and M. Ehrenfried and G. Elbakian and F. Ellinghaus and J. Ely and R. Fabbri and A. Fantoni and A. Fechtchenko and L. Felawka and Filippone, {B. W.} and H. Fischer and B. Fox and J. Franz and S. Frullani and Y. G{\"a}rber and F. Garibaldi and E. Garutti and G. Gavrilov and V. Gharibyan and G. Graw and O. Grebeniouk and Green, {P. W.} and Greeniaus, {L. G.} and A. Gute and W. Haeberli and K. Hafidi and M. Hartig and D. Hasch and D. Heesbeen and Heinsius, {F. H.} and M. Henoch and R. Hertenberger and Hesselink, {W. H.A.} and G. Hofman and Y. Holler and Holt, {R. J.} and B. Hommez and G. Iarygin and A. Izotov and Jackson, {H. E.} and A. Jgoun and P. Jung and R. Kaiser and A. Kisselev and P. Kitching and K. K{\"o}nigsmann and H. Kolster and V. Korotkov and E. Kotik and V. Kozlov and B. Krauss and Krivokhijine, {V. G.} and G. Kyle and L. Lagamba and A. Laziev and P. Lenisa and P. Liebing and T. Lindemann and W. Lorenzon and A. Maas and Makins, {N. C.R.} and H. Marukyan and F. Masoli and K. McIlhany and F. Meissner and F. Menden and V. Mexner and N. Meyners and O. Mikloukho and R. Milner and V. Muccifora and A. Nagaitsev and E. Nappi and Y. Naryshkin and A. Nass and K. Negodaeva and Nowak, {W. D.} and K. Oganessyan and O'Neill, {T. G.} and Owen, {B. R.} and Pate, {S. F.} and S. Podiatchev and S. Potashov and Potterveld, {D. H.} and M. Raithel and G. Rakness and V. Rappoport and R. Redwine and D. Reggiani and P. Reimer and Reolon, {A. R.} and K. Rith and D. Robinson and A. Rostomyan and D. Ryckbosch and Y. Sakemi and I. Sanjiev and F. Sato and I. Savin and C. Scarlett and A. Sch{\"a}fer and C. Schill and F. Schmidt and G. Schnell and Sch{\"u}ler, {K. P.} and A. Schwind and J. Seibert and B. Seitz and Shibata, {T. A.} and V. Shutov and Simani, {M. C.} and A. Simon and K. Sinram and E. Steffens and Steijger, {J. J.M.} and J. Stewart and U. St{\"o}sslein and K. Suetsugu and S. Taroian and A. Terkulov and S. Tessarin and E. Thomas and B. Tipton and M. Tytgat and Urciuoli, {G. M.} and {van den Brand}, {J. F.J.} and {van der Steenhoven}, G. and {van de Vyver}, R. and Vetterli, {M. C.} and V. Vikhrov and Vincter, {M. G.} and J. Visser and J. Volmer and C. Weiskopf and J. Wendland and J. Wilbert and T. Wise and S. Yen and S. Yoneyama and H. Zohrabian",

note = "Funding Information: We thank M. Diehl, M. Guidal, D. M{\"u}ller, G. Piller, M.V. Polyakov, M. Strikman, and O. Teryaev for many interesting discussions on this subject. We gratefully acknowledge the DESY management for its support and the DESY staff and the staffs of the collaborating institutions. This work was supported by the FWO-Flanders, Belgium; the Natural Sciences and Engineering Research Council of Canada; the INTAS and TMR network contributions from the European Community; the German Bundesministerium f{\"u}r Bildung und Forschung; the Deutsche Forschungsgemeinschaft (DFG); the Deutscher Akademischer Austauschdienst (DAAD); the Italian Istituto Nazionale di Fisica Nucleare (INFN); Monbusho International Scientific Research Program, JSPS, and Toray Science Foundation of Japan; the Dutch Foundation for Fundamenteel Onderzoek der Materie (FOM); the UK Particle Physics and Astronomy Research Council; and the US Department of Energy and National Science Foundation.",

year = "2002",

month = may,

day = "23",

doi = "10.1016/S0370-2693(02)01780-X",

language = "English (US)",

volume = "535",

pages = "85--92",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

number = "1-4",

}

TY - JOUR

T1 - Single-spin azimuthal asymmetry in exclusive electroproduction of π + mesons

AU - Airapetian, A.

AU - Akopov, N.

AU - Akopov, Z.

AU - Amarian, M.

AU - Aschenauer, E. C.

AU - Avakian, H.

AU - Avakian, R.

AU - Avetissian, A.

AU - Avetissian, E.

AU - Bailey, P.

AU - Baturin, V.

AU - Baumgarten, C.

AU - Beckmann, M.

AU - Belostotski, S.

AU - Bernreuther, S.

AU - Bianchi, N.

AU - Böttcher, H.

AU - Borissov, A.

AU - Bouhali, O.

AU - Bouwhuis, M.

AU - Brack, J.

AU - Brauksiepe, S.

AU - Brüll, A.

AU - Brunn, I.

AU - Bulten, H. J.

AU - Capitani, G. P.

AU - Chumney, P.

AU - Cisbani, E.

AU - Ciullo, G.

AU - Court, G. R.

AU - Dalpiaz, P. F.

AU - De Leo, R.

AU - De Nardo, L.

AU - De Sanctis, E.

AU - De Schepper, D.

AU - Devitsin, E.

AU - de Witt Huberts, P. K.A.

AU - Di Nezza, P.

AU - Düren, M.

AU - Ehrenfried, M.

AU - Elbakian, G.

AU - Ellinghaus, F.

AU - Ely, J.

AU - Fabbri, R.

AU - Fantoni, A.

AU - Fechtchenko, A.

AU - Felawka, L.

AU - Filippone, B. W.

AU - Fischer, H.

AU - Fox, B.

AU - Franz, J.

AU - Frullani, S.

AU - Gärber, Y.

AU - Garibaldi, F.

AU - Garutti, E.

AU - Gavrilov, G.

AU - Gharibyan, V.

AU - Graw, G.

AU - Grebeniouk, O.

AU - Green, P. W.

AU - Greeniaus, L. G.

AU - Gute, A.

AU - Haeberli, W.

AU - Hafidi, K.

AU - Hartig, M.

AU - Hasch, D.

AU - Heesbeen, D.

AU - Heinsius, F. H.

AU - Henoch, M.

AU - Hertenberger, R.

AU - Hesselink, W. H.A.

AU - Hofman, G.

AU - Holler, Y.

AU - Holt, R. J.

AU - Hommez, B.

AU - Iarygin, G.

AU - Izotov, A.

AU - Jackson, H. E.

AU - Jgoun, A.

AU - Jung, P.

AU - Kaiser, R.

AU - Kisselev, A.

AU - Kitching, P.

AU - Königsmann, K.

AU - Kolster, H.

AU - Korotkov, V.

AU - Kotik, E.

AU - Kozlov, V.

AU - Krauss, B.

AU - Krivokhijine, V. G.

AU - Kyle, G.

AU - Lagamba, L.

AU - Laziev, A.

AU - Lenisa, P.

AU - Liebing, P.

AU - Lindemann, T.

AU - Lorenzon, W.

AU - Maas, A.

AU - Makins, N. C.R.

AU - Marukyan, H.

AU - Masoli, F.

AU - McIlhany, K.

AU - Meissner, F.

AU - Menden, F.

AU - Mexner, V.

AU - Meyners, N.

AU - Mikloukho, O.

AU - Milner, R.

AU - Muccifora, V.

AU - Nagaitsev, A.

AU - Nappi, E.

AU - Naryshkin, Y.

AU - Nass, A.

AU - Negodaeva, K.

AU - Nowak, W. D.

AU - Oganessyan, K.

AU - O'Neill, T. G.

AU - Owen, B. R.

AU - Pate, S. F.

AU - Podiatchev, S.

AU - Potashov, S.

AU - Potterveld, D. H.

AU - Raithel, M.

AU - Rakness, G.

AU - Rappoport, V.

AU - Redwine, R.

AU - Reggiani, D.

AU - Reimer, P.

AU - Reolon, A. R.

AU - Rith, K.

AU - Robinson, D.

AU - Rostomyan, A.

AU - Ryckbosch, D.

AU - Sakemi, Y.

AU - Sanjiev, I.

AU - Sato, F.

AU - Savin, I.

AU - Scarlett, C.

AU - Schäfer, A.

AU - Schill, C.

AU - Schmidt, F.

AU - Schnell, G.

AU - Schüler, K. P.

AU - Schwind, A.

AU - Seibert, J.

AU - Seitz, B.

AU - Shibata, T. A.

AU - Shutov, V.

AU - Simani, M. C.

AU - Simon, A.

AU - Sinram, K.

AU - Steffens, E.

AU - Steijger, J. J.M.

AU - Stewart, J.

AU - Stösslein, U.

AU - Suetsugu, K.

AU - Taroian, S.

AU - Terkulov, A.

AU - Tessarin, S.

AU - Thomas, E.

AU - Tipton, B.

AU - Tytgat, M.

AU - Urciuoli, G. M.

AU - van den Brand, J. F.J.

AU - van der Steenhoven, G.

AU - van de Vyver, R.

AU - Vetterli, M. C.

AU - Vikhrov, V.

AU - Vincter, M. G.

AU - Visser, J.

AU - Volmer, J.

AU - Weiskopf, C.

AU - Wendland, J.

AU - Wilbert, J.

AU - Wise, T.

AU - Yen, S.

AU - Yoneyama, S.

AU - Zohrabian, H.

N1 - Funding Information: We thank M. Diehl, M. Guidal, D. Müller, G. Piller, M.V. Polyakov, M. Strikman, and O. Teryaev for many interesting discussions on this subject. We gratefully acknowledge the DESY management for its support and the DESY staff and the staffs of the collaborating institutions. This work was supported by the FWO-Flanders, Belgium; the Natural Sciences and Engineering Research Council of Canada; the INTAS and TMR network contributions from the European Community; the German Bundesministerium für Bildung und Forschung; the Deutsche Forschungsgemeinschaft (DFG); the Deutscher Akademischer Austauschdienst (DAAD); the Italian Istituto Nazionale di Fisica Nucleare (INFN); Monbusho International Scientific Research Program, JSPS, and Toray Science Foundation of Japan; the Dutch Foundation for Fundamenteel Onderzoek der Materie (FOM); the UK Particle Physics and Astronomy Research Council; and the US Department of Energy and National Science Foundation.

PY - 2002/5/23

Y1 - 2002/5/23

N2 - A single-spin asymmetry in the distribution of exclusively produced π + mesons azimuthally around the virtual photon direction relative to the lepton scattering plane has been measured for the first time in deep-inelastic scattering of positrons off longitudinally polarized protons. Integrated over the experimental acceptance, the sin moment of the polarization asymmetry of the cross section is measured to be -0.18 ± 0.05(stat.) ± 0.02(syst.). The asymmetry is also studied as a function of the relevant kinematic variables, and its magnitude is found to grow with decreasing x and increasing -t and vanish at t → t min (where x is the Bjorken scaling variable and t is the squared four-momentum transferred to the nucleon).

AB - A single-spin asymmetry in the distribution of exclusively produced π + mesons azimuthally around the virtual photon direction relative to the lepton scattering plane has been measured for the first time in deep-inelastic scattering of positrons off longitudinally polarized protons. Integrated over the experimental acceptance, the sin moment of the polarization asymmetry of the cross section is measured to be -0.18 ± 0.05(stat.) ± 0.02(syst.). The asymmetry is also studied as a function of the relevant kinematic variables, and its magnitude is found to grow with decreasing x and increasing -t and vanish at t → t min (where x is the Bjorken scaling variable and t is the squared four-momentum transferred to the nucleon).

UR - http://www.scopus.com/inward/record.url?scp=0037161931&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0037161931&partnerID=8YFLogxK

U2 - 10.1016/S0370-2693(02)01780-X

DO - 10.1016/S0370-2693(02)01780-X

M3 - Article

AN - SCOPUS:0037161931

SN - 0370-2693

VL - 535

SP - 85

EP - 92

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 1-4

ER -