Measurement of ep→epπ0 beam spin asymmetries above the resonance region

R. De Masi, M. Garçon, B. Zhao, M. J. Amaryan, P. Ambrozewicz, M. Anghinolfi, G. Asryan, H. Avakian, H. Bagdasaryan, N. Baillie, J. Ball, J. P. Ball, N. A. Baltzell, V. Batourine, M. Battaglieri, I. Bedlinskiy, M. Bellis, N. Benmouna, B. L. Berman, P. BertinA. S. Biselli, L. Blaszczyk, S. Bouchigny, S. Boiarinov, R. Bradford, D. Branford, W. J. Briscoe, W. K. Brooks, S. Bültmann, V. D. Burkert, C. Butuceanu, J. R. Calarco, S. L. Careccia, D. S. Carman, L. Casey, S. Chen, L. Cheng, P. L. Cole, P. Collins, P. Coltharp, D. Crabb, V. Crede, N. Dashyan, E. De Sanctis, R. De Vita, P. V. Degtyarenko, A. Deur, K. V. Dharmawardane, R. Dickson, C. Djalali, G. E. Dodge, J. Donnelly, D. Doughty, Michael Dugger, O. P. Dzyubak, H. Egiyan, K. S. Egiyan, L. El Fassi, L. Elouadrhiri, P. Eugenio, G. Fedotov, G. Feldman, A. Fradi, H. Funsten, G. Gavalian, G. P. Gilfoyle, K. L. Giovanetti, F. X. Girod, J. T. Goetz, A. Gonenc, R. W. Gothe, K. A. Griffioen, M. Guidal, N. Guler, L. Guo, V. Gyurjyan, K. Hafidi, H. Hakobyan, C. Hanretty, F. W. Hersman, K. Hicks, I. Hleiqawi, M. Holtrop, C. E. Hyde-Wright, Y. Ilieva, D. G. Ireland, B. S. Ishkhanov, E. L. Isupov, M. M. Ito, D. Jenkins, H. S. Jo, J. R. Johnstone, K. Joo, H. G. Juengst, N. Kalantarians, J. D. Kellie, M. Khandaker, W. Kim, A. Klein, F. J. Klein, A. V. Klimenko, M. Kossov, Z. Krahn, L. H. Kramer, V. Kubarovsky, J. Kuhn, S. E. Kuhn, S. V. Kuleshov, J. Lachniet, J. M. Laget, J. Langheinrich, D. Lawrence, T. Lee, K. Livingston, H. Y. Lu, M. MacCormick, N. Markov, P. Mattione, M. Mazouz, B. McKinnon, B. A. Mecking, M. D. Mestayer, C. A. Meyer, T. Mibe, B. Michel, K. Mikhailov, M. Mirazita, R. Miskimen, V. Mokeev, B. Moreno, K. Moriya, S. A. Morrow, M. Moteabbed, E. Munevar, G. S. Mutchler, P. Nadel-Turonski, R. Nasseripour, S. Niccolai, G. Niculescu, I. Niculescu, B. B. Niczyporuk, M. R. Niroula, R. A. Niyazov, M. Nozar, M. Osipenko, A. I. Ostrovidov, K. Park, E. Pasyuk, C. Paterson, S. Anefalos Pereira, J. Pierce, N. Pivnyuk, D. Pocanic, O. Pogorelko, S. Pozdniakov, J. W. Price, S. Procureur, Y. Prok, D. Protopopescu, B. A. Raue, G. Ricco, M. Ripani, Barry Ritchie, F. Ronchetti, G. Rosner, P. Rossi, F. Sabatié, J. Salamanca, C. Salgado, J. P. Santoro, V. Sapunenko, R. A. Schumacher, V. S. Serov, Y. G. Sharabian, D. Sharov, N. V. Shvedunov, E. S. Smith, L. C. Smith, D. I. Sober, D. Sokhan, A. Stavinsky, S. Stepanyan, S. S. Stepanyan, B. E. Stokes, P. Stoler, I. I. Strakovsky, S. Strauch, M. Taiuti, D. J. Tedeschi, A. Tkabladze, S. Tkachenko, C. Tur, M. Ungaro, M. F. Vineyard, A. V. Vlassov, E. Voutier, D. P. Watts, L. B. Weinstein, D. P. Weygand, M. Williams, E. Wolin, M. H. Wood, A. Yegneswaran, L. Zana, J. Zhang, Z. W. Zhao

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

The beam spin asymmetry (BSA) in the exclusive reaction e→p→epπ0 was measured with the CEBAF 5.77 GeV polarized electron beam and Large Acceptance Spectrometer (CLAS). The xB,Q2,t, and dependences of the π0 BSA are presented in the deep inelastic regime. The asymmetries are fitted with a sin function and their amplitudes are extracted. Overall, they are of the order of 0.04-0.11 and roughly independent of t. This is the signature of a nonzero longitudinal-transverse interference. The implications concerning the applicability of a formalism based on generalized parton distributions, as well as the extension of a Regge formalism at high photon virtualities, are discussed.

Original languageEnglish (US)
Article number042201
JournalPhysical Review C - Nuclear Physics
Volume77
Issue number4
DOIs
StatePublished - Apr 14 2008

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asymmetry
formalism
acceptability
partons
signatures
electron beams
spectrometers
interference
photons

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics

Cite this

Masi, R. D., Garçon, M., Zhao, B., Amaryan, M. J., Ambrozewicz, P., Anghinolfi, M., ... Zhao, Z. W. (2008). Measurement of ep→epπ0 beam spin asymmetries above the resonance region. Physical Review C - Nuclear Physics, 77(4), [042201]. https://doi.org/10.1103/PhysRevC.77.042201

Measurement of ep→epπ0 beam spin asymmetries above the resonance region. / Masi, R. De; Garçon, M.; Zhao, B.; Amaryan, M. J.; Ambrozewicz, P.; Anghinolfi, M.; Asryan, G.; Avakian, H.; Bagdasaryan, H.; Baillie, N.; Ball, J.; Ball, J. P.; Baltzell, N. A.; Batourine, V.; Battaglieri, M.; Bedlinskiy, I.; Bellis, M.; Benmouna, N.; Berman, B. L.; Bertin, P.; Biselli, A. S.; Blaszczyk, L.; Bouchigny, S.; Boiarinov, S.; Bradford, R.; Branford, D.; Briscoe, W. J.; Brooks, W. K.; Bültmann, S.; Burkert, V. D.; Butuceanu, C.; Calarco, J. R.; Careccia, S. L.; Carman, D. S.; Casey, L.; Chen, S.; Cheng, L.; Cole, P. L.; Collins, P.; Coltharp, P.; Crabb, D.; Crede, V.; Dashyan, N.; Sanctis, E. De; Vita, R. De; Degtyarenko, P. V.; Deur, A.; Dharmawardane, K. V.; Dickson, R.; Djalali, C.; Dodge, G. E.; Donnelly, J.; Doughty, D.; Dugger, Michael; Dzyubak, O. P.; Egiyan, H.; Egiyan, K. S.; Fassi, L. El; Elouadrhiri, L.; Eugenio, P.; Fedotov, G.; Feldman, G.; Fradi, A.; Funsten, H.; Gavalian, G.; Gilfoyle, G. P.; Giovanetti, K. L.; Girod, F. X.; Goetz, J. T.; Gonenc, A.; Gothe, R. W.; Griffioen, K. A.; Guidal, M.; Guler, N.; Guo, L.; Gyurjyan, V.; Hafidi, K.; Hakobyan, H.; Hanretty, C.; Hersman, F. W.; Hicks, K.; Hleiqawi, I.; Holtrop, M.; Hyde-Wright, C. E.; Ilieva, Y.; Ireland, D. G.; Ishkhanov, B. S.; Isupov, E. L.; Ito, M. M.; Jenkins, D.; Jo, H. S.; Johnstone, J. R.; Joo, K.; Juengst, H. G.; Kalantarians, N.; Kellie, J. D.; Khandaker, M.; Kim, W.; Klein, A.; Klein, F. J.; Klimenko, A. V.; Kossov, M.; Krahn, Z.; Kramer, L. H.; Kubarovsky, V.; Kuhn, J.; Kuhn, S. E.; Kuleshov, S. V.; Lachniet, J.; Laget, J. M.; Langheinrich, J.; Lawrence, D.; Lee, T.; Livingston, K.; Lu, H. Y.; MacCormick, M.; Markov, N.; Mattione, P.; Mazouz, M.; McKinnon, B.; Mecking, B. A.; Mestayer, M. D.; Meyer, C. A.; Mibe, T.; Michel, B.; Mikhailov, K.; Mirazita, M.; Miskimen, R.; Mokeev, V.; Moreno, B.; Moriya, K.; Morrow, S. A.; Moteabbed, M.; Munevar, E.; Mutchler, G. S.; Nadel-Turonski, P.; Nasseripour, R.; Niccolai, S.; Niculescu, G.; Niculescu, I.; Niczyporuk, B. B.; Niroula, M. R.; Niyazov, R. A.; Nozar, M.; Osipenko, M.; Ostrovidov, A. I.; Park, K.; Pasyuk, E.; Paterson, C.; Pereira, S. Anefalos; Pierce, J.; Pivnyuk, N.; Pocanic, D.; Pogorelko, O.; Pozdniakov, S.; Price, J. W.; Procureur, S.; Prok, Y.; Protopopescu, D.; Raue, B. A.; Ricco, G.; Ripani, M.; Ritchie, Barry; Ronchetti, F.; Rosner, G.; Rossi, P.; Sabatié, F.; Salamanca, J.; Salgado, C.; Santoro, J. P.; Sapunenko, V.; Schumacher, R. A.; Serov, V. S.; Sharabian, Y. G.; Sharov, D.; Shvedunov, N. V.; Smith, E. S.; Smith, L. C.; Sober, D. I.; Sokhan, D.; Stavinsky, A.; Stepanyan, S.; Stepanyan, S. S.; Stokes, B. E.; Stoler, P.; Strakovsky, I. I.; Strauch, S.; Taiuti, M.; Tedeschi, D. J.; Tkabladze, A.; Tkachenko, S.; Tur, C.; Ungaro, M.; Vineyard, M. F.; Vlassov, A. V.; Voutier, E.; Watts, D. P.; Weinstein, L. B.; Weygand, D. P.; Williams, M.; Wolin, E.; Wood, M. H.; Yegneswaran, A.; Zana, L.; Zhang, J.; Zhao, Z. W.

In: Physical Review C - Nuclear Physics, Vol. 77, No. 4, 042201, 14.04.2008.

Research output: Contribution to journalArticle

Masi, RD, Garçon, M, Zhao, B, Amaryan, MJ, Ambrozewicz, P, Anghinolfi, M, Asryan, G, Avakian, H, Bagdasaryan, H, Baillie, N, Ball, J, Ball, JP, Baltzell, NA, Batourine, V, Battaglieri, M, Bedlinskiy, I, Bellis, M, Benmouna, N, Berman, BL, Bertin, P, Biselli, AS, Blaszczyk, L, Bouchigny, S, Boiarinov, S, Bradford, R, Branford, D, Briscoe, WJ, Brooks, WK, Bültmann, S, Burkert, VD, Butuceanu, C, Calarco, JR, Careccia, SL, Carman, DS, Casey, L, Chen, S, Cheng, L, Cole, PL, Collins, P, Coltharp, P, Crabb, D, Crede, V, Dashyan, N, Sanctis, ED, Vita, RD, Degtyarenko, PV, Deur, A, Dharmawardane, KV, Dickson, R, Djalali, C, Dodge, GE, Donnelly, J, Doughty, D, Dugger, M, Dzyubak, OP, Egiyan, H, Egiyan, KS, Fassi, LE, Elouadrhiri, L, Eugenio, P, Fedotov, G, Feldman, G, Fradi, A, Funsten, H, Gavalian, G, Gilfoyle, GP, Giovanetti, KL, Girod, FX, Goetz, JT, Gonenc, A, Gothe, RW, Griffioen, KA, Guidal, M, Guler, N, Guo, L, Gyurjyan, V, Hafidi, K, Hakobyan, H, Hanretty, C, Hersman, FW, Hicks, K, Hleiqawi, I, Holtrop, M, Hyde-Wright, CE, Ilieva, Y, Ireland, DG, Ishkhanov, BS, Isupov, EL, Ito, MM, Jenkins, D, Jo, HS, Johnstone, JR, Joo, K, Juengst, HG, Kalantarians, N, Kellie, JD, Khandaker, M, Kim, W, Klein, A, Klein, FJ, Klimenko, AV, Kossov, M, Krahn, Z, Kramer, LH, Kubarovsky, V, Kuhn, J, Kuhn, SE, Kuleshov, SV, Lachniet, J, Laget, JM, Langheinrich, J, Lawrence, D, Lee, T, Livingston, K, Lu, HY, MacCormick, M, Markov, N, Mattione, P, Mazouz, M, McKinnon, B, Mecking, BA, Mestayer, MD, Meyer, CA, Mibe, T, Michel, B, Mikhailov, K, Mirazita, M, Miskimen, R, Mokeev, V, Moreno, B, Moriya, K, Morrow, SA, Moteabbed, M, Munevar, E, Mutchler, GS, Nadel-Turonski, P, Nasseripour, R, Niccolai, S, Niculescu, G, Niculescu, I, Niczyporuk, BB, Niroula, MR, Niyazov, RA, Nozar, M, Osipenko, M, Ostrovidov, AI, Park, K, Pasyuk, E, Paterson, C, Pereira, SA, Pierce, J, Pivnyuk, N, Pocanic, D, Pogorelko, O, Pozdniakov, S, Price, JW, Procureur, S, Prok, Y, Protopopescu, D, Raue, BA, Ricco, G, Ripani, M, Ritchie, B, Ronchetti, F, Rosner, G, Rossi, P, Sabatié, F, Salamanca, J, Salgado, C, Santoro, JP, Sapunenko, V, Schumacher, RA, Serov, VS, Sharabian, YG, Sharov, D, Shvedunov, NV, Smith, ES, Smith, LC, Sober, DI, Sokhan, D, Stavinsky, A, Stepanyan, S, Stepanyan, SS, Stokes, BE, Stoler, P, Strakovsky, II, Strauch, S, Taiuti, M, Tedeschi, DJ, Tkabladze, A, Tkachenko, S, Tur, C, Ungaro, M, Vineyard, MF, Vlassov, AV, Voutier, E, Watts, DP, Weinstein, LB, Weygand, DP, Williams, M, Wolin, E, Wood, MH, Yegneswaran, A, Zana, L, Zhang, J & Zhao, ZW 2008, 'Measurement of ep→epπ0 beam spin asymmetries above the resonance region', Physical Review C - Nuclear Physics, vol. 77, no. 4, 042201. https://doi.org/10.1103/PhysRevC.77.042201
Masi RD, Garçon M, Zhao B, Amaryan MJ, Ambrozewicz P, Anghinolfi M et al. Measurement of ep→epπ0 beam spin asymmetries above the resonance region. Physical Review C - Nuclear Physics. 2008 Apr 14;77(4). 042201. https://doi.org/10.1103/PhysRevC.77.042201
Masi, R. De ; Garçon, M. ; Zhao, B. ; Amaryan, M. J. ; Ambrozewicz, P. ; Anghinolfi, M. ; Asryan, G. ; Avakian, H. ; Bagdasaryan, H. ; Baillie, N. ; Ball, J. ; Ball, J. P. ; Baltzell, N. A. ; Batourine, V. ; Battaglieri, M. ; Bedlinskiy, I. ; Bellis, M. ; Benmouna, N. ; Berman, B. L. ; Bertin, P. ; Biselli, A. S. ; Blaszczyk, L. ; Bouchigny, S. ; Boiarinov, S. ; Bradford, R. ; Branford, D. ; Briscoe, W. J. ; Brooks, W. K. ; Bültmann, S. ; Burkert, V. D. ; Butuceanu, C. ; Calarco, J. R. ; Careccia, S. L. ; Carman, D. S. ; Casey, L. ; Chen, S. ; Cheng, L. ; Cole, P. L. ; Collins, P. ; Coltharp, P. ; Crabb, D. ; Crede, V. ; Dashyan, N. ; Sanctis, E. De ; Vita, R. De ; Degtyarenko, P. V. ; Deur, A. ; Dharmawardane, K. V. ; Dickson, R. ; Djalali, C. ; Dodge, G. E. ; Donnelly, J. ; Doughty, D. ; Dugger, Michael ; Dzyubak, O. P. ; Egiyan, H. ; Egiyan, K. S. ; Fassi, L. El ; Elouadrhiri, L. ; Eugenio, P. ; Fedotov, G. ; Feldman, G. ; Fradi, A. ; Funsten, H. ; Gavalian, G. ; Gilfoyle, G. P. ; Giovanetti, K. L. ; Girod, F. X. ; Goetz, J. T. ; Gonenc, A. ; Gothe, R. W. ; Griffioen, K. A. ; Guidal, M. ; Guler, N. ; Guo, L. ; Gyurjyan, V. ; Hafidi, K. ; Hakobyan, H. ; Hanretty, C. ; Hersman, F. W. ; Hicks, K. ; Hleiqawi, I. ; Holtrop, M. ; Hyde-Wright, C. E. ; Ilieva, Y. ; Ireland, D. G. ; Ishkhanov, B. S. ; Isupov, E. L. ; Ito, M. M. ; Jenkins, D. ; Jo, H. S. ; Johnstone, J. R. ; Joo, K. ; Juengst, H. G. ; Kalantarians, N. ; Kellie, J. D. ; Khandaker, M. ; Kim, W. ; Klein, A. ; Klein, F. J. ; Klimenko, A. V. ; Kossov, M. ; Krahn, Z. ; Kramer, L. H. ; Kubarovsky, V. ; Kuhn, J. ; Kuhn, S. E. ; Kuleshov, S. V. ; Lachniet, J. ; Laget, J. M. ; Langheinrich, J. ; Lawrence, D. ; Lee, T. ; Livingston, K. ; Lu, H. Y. ; MacCormick, M. ; Markov, N. ; Mattione, P. ; Mazouz, M. ; McKinnon, B. ; Mecking, B. A. ; Mestayer, M. D. ; Meyer, C. A. ; Mibe, T. ; Michel, B. ; Mikhailov, K. ; Mirazita, M. ; Miskimen, R. ; Mokeev, V. ; Moreno, B. ; Moriya, K. ; Morrow, S. A. ; Moteabbed, M. ; Munevar, E. ; Mutchler, G. S. ; Nadel-Turonski, P. ; Nasseripour, R. ; Niccolai, S. ; Niculescu, G. ; Niculescu, I. ; Niczyporuk, B. B. ; Niroula, M. R. ; Niyazov, R. A. ; Nozar, M. ; Osipenko, M. ; Ostrovidov, A. I. ; Park, K. ; Pasyuk, E. ; Paterson, C. ; Pereira, S. Anefalos ; Pierce, J. ; Pivnyuk, N. ; Pocanic, D. ; Pogorelko, O. ; Pozdniakov, S. ; Price, J. W. ; Procureur, S. ; Prok, Y. ; Protopopescu, D. ; Raue, B. A. ; Ricco, G. ; Ripani, M. ; Ritchie, Barry ; Ronchetti, F. ; Rosner, G. ; Rossi, P. ; Sabatié, F. ; Salamanca, J. ; Salgado, C. ; Santoro, J. P. ; Sapunenko, V. ; Schumacher, R. A. ; Serov, V. S. ; Sharabian, Y. G. ; Sharov, D. ; Shvedunov, N. V. ; Smith, E. S. ; Smith, L. C. ; Sober, D. I. ; Sokhan, D. ; Stavinsky, A. ; Stepanyan, S. ; Stepanyan, S. S. ; Stokes, B. E. ; Stoler, P. ; Strakovsky, I. I. ; Strauch, S. ; Taiuti, M. ; Tedeschi, D. J. ; Tkabladze, A. ; Tkachenko, S. ; Tur, C. ; Ungaro, M. ; Vineyard, M. F. ; Vlassov, A. V. ; Voutier, E. ; Watts, D. P. ; Weinstein, L. B. ; Weygand, D. P. ; Williams, M. ; Wolin, E. ; Wood, M. H. ; Yegneswaran, A. ; Zana, L. ; Zhang, J. ; Zhao, Z. W. / Measurement of ep→epπ0 beam spin asymmetries above the resonance region. In: Physical Review C - Nuclear Physics. 2008 ; Vol. 77, No. 4.
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title = "Measurement of ep→epπ0 beam spin asymmetries above the resonance region",
abstract = "The beam spin asymmetry (BSA) in the exclusive reaction e→p→epπ0 was measured with the CEBAF 5.77 GeV polarized electron beam and Large Acceptance Spectrometer (CLAS). The xB,Q2,t, and dependences of the π0 BSA are presented in the deep inelastic regime. The asymmetries are fitted with a sin function and their amplitudes are extracted. Overall, they are of the order of 0.04-0.11 and roughly independent of t. This is the signature of a nonzero longitudinal-transverse interference. The implications concerning the applicability of a formalism based on generalized parton distributions, as well as the extension of a Regge formalism at high photon virtualities, are discussed.",
author = "Masi, {R. De} and M. Gar{\cc}on and B. Zhao and Amaryan, {M. J.} and P. Ambrozewicz and M. Anghinolfi and G. Asryan and H. Avakian and H. Bagdasaryan and N. Baillie and J. Ball and Ball, {J. P.} and Baltzell, {N. A.} and V. Batourine and M. Battaglieri and I. Bedlinskiy and M. Bellis and N. Benmouna and Berman, {B. L.} and P. Bertin and Biselli, {A. S.} and L. Blaszczyk and S. Bouchigny and S. Boiarinov and R. Bradford and D. Branford and Briscoe, {W. J.} and Brooks, {W. K.} and S. B{\"u}ltmann and Burkert, {V. D.} and C. Butuceanu and Calarco, {J. R.} and Careccia, {S. L.} and Carman, {D. S.} and L. Casey and S. Chen and L. Cheng and Cole, {P. L.} and P. Collins and P. Coltharp and D. Crabb and V. Crede and N. Dashyan and Sanctis, {E. De} and Vita, {R. De} and Degtyarenko, {P. V.} and A. Deur and Dharmawardane, {K. V.} and R. Dickson and C. Djalali and Dodge, {G. E.} and J. Donnelly and D. Doughty and Michael Dugger and Dzyubak, {O. P.} and H. Egiyan and Egiyan, {K. S.} and Fassi, {L. El} and L. Elouadrhiri and P. Eugenio and G. Fedotov and G. Feldman and A. Fradi and H. Funsten and G. Gavalian and Gilfoyle, {G. P.} and Giovanetti, {K. L.} and Girod, {F. X.} and Goetz, {J. T.} and A. Gonenc and Gothe, {R. W.} and Griffioen, {K. A.} and M. Guidal and N. Guler and L. Guo and V. Gyurjyan and K. Hafidi and H. Hakobyan and C. Hanretty and Hersman, {F. W.} and K. Hicks and I. Hleiqawi and M. Holtrop and Hyde-Wright, {C. E.} and Y. Ilieva and Ireland, {D. G.} and Ishkhanov, {B. S.} and Isupov, {E. L.} and Ito, {M. M.} and D. Jenkins and Jo, {H. S.} and Johnstone, {J. R.} and K. Joo and Juengst, {H. G.} and N. Kalantarians and Kellie, {J. D.} and M. Khandaker and W. Kim and A. Klein and Klein, {F. J.} and Klimenko, {A. V.} and M. Kossov and Z. Krahn and Kramer, {L. H.} and V. Kubarovsky and J. Kuhn and Kuhn, {S. E.} and Kuleshov, {S. V.} and J. Lachniet and Laget, {J. M.} and J. Langheinrich and D. Lawrence and T. Lee and K. Livingston and Lu, {H. Y.} and M. MacCormick and N. Markov and P. Mattione and M. Mazouz and B. McKinnon and Mecking, {B. A.} and Mestayer, {M. D.} and Meyer, {C. A.} and T. Mibe and B. Michel and K. Mikhailov and M. Mirazita and R. Miskimen and V. Mokeev and B. Moreno and K. Moriya and Morrow, {S. A.} and M. Moteabbed and E. Munevar and Mutchler, {G. S.} and P. Nadel-Turonski and R. Nasseripour and S. Niccolai and G. Niculescu and I. Niculescu and Niczyporuk, {B. B.} and Niroula, {M. R.} and Niyazov, {R. A.} and M. Nozar and M. Osipenko and Ostrovidov, {A. I.} and K. Park and E. Pasyuk and C. Paterson and Pereira, {S. Anefalos} and J. Pierce and N. Pivnyuk and D. Pocanic and O. Pogorelko and S. Pozdniakov and Price, {J. W.} and S. Procureur and Y. Prok and D. Protopopescu and Raue, {B. A.} and G. Ricco and M. Ripani and Barry Ritchie and F. Ronchetti and G. Rosner and P. Rossi and F. Sabati{\'e} and J. Salamanca and C. Salgado and Santoro, {J. P.} and V. Sapunenko and Schumacher, {R. A.} and Serov, {V. S.} and Sharabian, {Y. G.} and D. Sharov and Shvedunov, {N. V.} and Smith, {E. S.} and Smith, {L. C.} and Sober, {D. I.} and D. Sokhan and A. Stavinsky and S. Stepanyan and Stepanyan, {S. S.} and Stokes, {B. E.} and P. Stoler and Strakovsky, {I. I.} and S. Strauch and M. Taiuti and Tedeschi, {D. J.} and A. Tkabladze and S. Tkachenko and C. Tur and M. Ungaro and Vineyard, {M. F.} and Vlassov, {A. V.} and E. Voutier and Watts, {D. P.} and Weinstein, {L. B.} and Weygand, {D. P.} and M. Williams and E. Wolin and Wood, {M. H.} and A. Yegneswaran and L. Zana and J. Zhang and Zhao, {Z. W.}",
year = "2008",
month = "4",
day = "14",
doi = "10.1103/PhysRevC.77.042201",
language = "English (US)",
volume = "77",
journal = "Physical Review C - Nuclear Physics",
issn = "0556-2813",
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}

TY - JOUR

T1 - Measurement of ep→epπ0 beam spin asymmetries above the resonance region

AU - Masi, R. De

AU - Garçon, M.

AU - Zhao, B.

AU - Amaryan, M. J.

AU - Ambrozewicz, P.

AU - Anghinolfi, M.

AU - Asryan, G.

AU - Avakian, H.

AU - Bagdasaryan, H.

AU - Baillie, N.

AU - Ball, J.

AU - Ball, J. P.

AU - Baltzell, N. A.

AU - Batourine, V.

AU - Battaglieri, M.

AU - Bedlinskiy, I.

AU - Bellis, M.

AU - Benmouna, N.

AU - Berman, B. L.

AU - Bertin, P.

AU - Biselli, A. S.

AU - Blaszczyk, L.

AU - Bouchigny, S.

AU - Boiarinov, S.

AU - Bradford, R.

AU - Branford, D.

AU - Briscoe, W. J.

AU - Brooks, W. K.

AU - Bültmann, S.

AU - Burkert, V. D.

AU - Butuceanu, C.

AU - Calarco, J. R.

AU - Careccia, S. L.

AU - Carman, D. S.

AU - Casey, L.

AU - Chen, S.

AU - Cheng, L.

AU - Cole, P. L.

AU - Collins, P.

AU - Coltharp, P.

AU - Crabb, D.

AU - Crede, V.

AU - Dashyan, N.

AU - Sanctis, E. De

AU - Vita, R. De

AU - Degtyarenko, P. V.

AU - Deur, A.

AU - Dharmawardane, K. V.

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PY - 2008/4/14

Y1 - 2008/4/14

N2 - The beam spin asymmetry (BSA) in the exclusive reaction e→p→epπ0 was measured with the CEBAF 5.77 GeV polarized electron beam and Large Acceptance Spectrometer (CLAS). The xB,Q2,t, and dependences of the π0 BSA are presented in the deep inelastic regime. The asymmetries are fitted with a sin function and their amplitudes are extracted. Overall, they are of the order of 0.04-0.11 and roughly independent of t. This is the signature of a nonzero longitudinal-transverse interference. The implications concerning the applicability of a formalism based on generalized parton distributions, as well as the extension of a Regge formalism at high photon virtualities, are discussed.

AB - The beam spin asymmetry (BSA) in the exclusive reaction e→p→epπ0 was measured with the CEBAF 5.77 GeV polarized electron beam and Large Acceptance Spectrometer (CLAS). The xB,Q2,t, and dependences of the π0 BSA are presented in the deep inelastic regime. The asymmetries are fitted with a sin function and their amplitudes are extracted. Overall, they are of the order of 0.04-0.11 and roughly independent of t. This is the signature of a nonzero longitudinal-transverse interference. The implications concerning the applicability of a formalism based on generalized parton distributions, as well as the extension of a Regge formalism at high photon virtualities, are discussed.

UR - http://www.scopus.com/inward/record.url?scp=42349085927&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=42349085927&partnerID=8YFLogxK

U2 - 10.1103/PhysRevC.77.042201

DO - 10.1103/PhysRevC.77.042201

M3 - Article

AN - SCOPUS:42349085927

VL - 77

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

SN - 0556-2813

IS - 4

M1 - 042201

ER -