Target and beam-target spin asymmetries in exclusive pion electroproduction for Q2>1GeV2 . II. ep→eπ0p

Bosted, P. E.; Amaryan, M. J.; Anefalos Pereira, S.; Avakian, H.; Badui, R. A.; Ball, J.; Baltzell, N. A.; Battaglieri, M.; Batourine, V.; Bedlinskiy, I.; Biselli, A. S.; Briscoe, W. J.; Bültmann, S.; Burkert, V. D.; Carman, D. S.; Celentano, A.; Chandavar, S.; Charles, G.; Ciullo, G.; Clark, L.; Colaneri, L.; Cole, P. L.; Contalbrigo, M.; Crede, V.; D'Angelo, A.; De Vita, R.; Deur, A.; De Sanctis, E.; Djalali, C.; Dupre, R.; Egiyan, H.; El Alaoui, A.; El Fassi, L.; Elouadrhiri, L.; Eugenio, P.; Fanchini, E.; Fedotov, G.; Filippi, A.; Fleming, J. A.; Forest, T.; Fradi, A.; Gevorgyan, N.; Ghandilyan, Y.; Gilfoyle, G. P.; Girod, F. X.; Gleason, C.; Gohn, W.; Golovatch, E.; Gothe, R. W.; Griffioen, K. A.; Guidal, M.; Hakobyan, H.; Hattawy, M.; Hicks, K.; Holtrop, M.; Hughes, S. M.; Ilieva, Y.; Ireland, D. G.; Ishkhanov, B. S.; Isupov, E. L.; Jiang, H.; Jo, H. S.; Joo, K.; Joosten, S.; Khachatryan, G.; Khandaker, M.; Kim, A.; Kim, W.; Klein, F. J.; Koirala, S.; Kubarovsky, V.; Kuhn, S. E.; Lanza, L.; Net, L. A.; Lenisa, P.; Livingston, K.; MacGregor, I. J.  D.; McCracken, M. E.; McKinnon, B.; Meyer, C. A.; Mirazita, M.; Mokeev, V. I.; Montgomery, R. A.; Munevar, E.; Munoz Camacho, C.; Murdoch, G.; Nadel-Turonski, P.; Niccolai, S.; Osipenko, M.; Ostrovidov, A. I.; Park, K.; Pasyuk, E.; Peng, P.; Phelps, W.; Pisano, S.; Pogorelko, O.; Price, J. W.; Prok, Y.; Protopopescu, D.; Puckett, A. J.  R.; Raue, B. A.; Ripani, M.; Rosner, G.; Rossi, P.; Schumacher, R. A.; Seder, E.; Skorodumina, Iu.; Smith, G. D.; Sokhan, D.; Sparveris, N.; Stankovic, I.; Stepanyan, S.; Strakovsky, I. I.; Strauch, S.; Taiuti, M.; Tian, Ye; Torayev, B.; Ungaro, M.; Voskanyan, H.; Voutier, E.; Walford, N. K.; Wei, X.; Weinstein, L. B.; Zachariou, N.; Zhang, J.; Zhao, Z. W.; Zonta, I.

doi:10.1103/PhysRevC.95.035207

Title: Target and beam-target spin asymmetries in exclusive pion electroproduction for $Q^{2} > 1 {GeV}^{2}$ . II. $e p \to e π^{0} p$

Abstract

Beam-target double-spin asymmetries and target single-spin asymmetries were measured for the exclusive π0 electroproduction reaction γ*p → pπ0, expanding an analysis of the γ*p → nπ+ reaction from the same experiment. The results were obtained from scattering of 6-GeV longitudinally polarized electrons off longitudinally polarized protons using the CEBAF Large Acceptance Spectrometer at Jefferson Laboratory. The kinematic ranges covered are 1.1 < W < 3 GeV and 1 < Q2 < 6 GeV2. Results were obtained for about 5700 bins in W, Q2, cos(θ*), and φ*. The beam-target asymmetries were found to generally be greater than zero, with relatively modest φ* dependence. The target asymmetries exhibit very strong φ* dependence, with a change in sign occurring between results at low W and high W, in contrast to π+ electroproduction. Reasonable agreement is found with phenomenological fits to previous data for W <1.6 GeV, but significant differences are seen at higher W. When combined with cross-sectional measurements, as well as π+ observables, the present results will provide powerful constraints on nucleon resonance amplitudes at moderate and large values of Q2, for resonances with masses as high as 2.4 GeV.

Authors:: Bosted, P. E.; Amaryan, M. J.; Anefalos Pereira, S.; Avakian, H.; Badui, R. A.; Ball, J.; Baltzell, N. A.; Battaglieri, M.; Batourine, V.; Bedlinskiy, I.; Biselli, A. S.; Briscoe, W. J.; Bültmann, S.; Burkert, V. D.; Carman, D. S.; Celentano, A.; Chandavar, S.; Charles, G.; Ciullo, G.; Clark, L. more »« less

Publication Date:: Mon Mar 20 00:00:00 EDT 2017

Research Org.:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Argonne National Lab. (ANL), Argonne, IL (United States); George Washington Univ., Washington, DC (United States); Mississippi State Univ., Starkville, MS (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF); National Research Foundation of Korea (NRF); United Kingdom Science and Technology Facilities Council; Instituto Nazionale di Fisica Nucleare (INFN)

Contributing Org.:: CLAS Collaboration

OSTI Identifier:: 1348182

Alternate Identifier(s):: OSTI ID: 1347814; OSTI ID: 1373715; OSTI ID: 1439720

Report Number(s):: JLAB-PHY-16-2388; DOE/OR/23177-4014; arXiv:1611.04987
Journal ID: ISSN 2469-9985; PRVCAN; TRN: US1700598

Grant/Contract Number:: AC05-84ER40150; AC05-06OR23177; AC02-06CH11357; SC0016583; FG02-07ER41528

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review C

Additional Journal Information:: Journal Volume: 95; Journal Issue: 3; Journal ID: ISSN 2469-9985

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats


                    Bosted, P. E., Amaryan, M. J., Anefalos Pereira, S., Avakian, H., Badui, R. A., Ball, J., Baltzell, N. A., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A. S., Briscoe, W. J., Bültmann, S., Burkert, V. D., Carman, D. S., Celentano, A., Chandavar, S., Charles, G., Ciullo, G., Clark, L., Colaneri, L., Cole, P. L., Contalbrigo, M., Crede, V., D'Angelo, A., De Vita, R., Deur, A., De Sanctis, E., Djalali, C., Dupre, R., Egiyan, H., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fanchini, E., Fedotov, G., Filippi, A., Fleming, J. A., Forest, T., Fradi, A., Gevorgyan, N., Ghandilyan, Y., Gilfoyle, G. P., Girod, F. X., Gleason, C., Gohn, W., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guidal, M., Hakobyan, H., Hattawy, M., Hicks, K., Holtrop, M., Hughes, S. M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jiang, H., Jo, H. S., Joo, K., Joosten, S., Khachatryan, G., Khandaker, M., Kim, A., Kim, W., Klein, F. J., Koirala, S., Kubarovsky, V., Kuhn, S. E., Lanza, L., Net, L. A., Lenisa, P., Livingston, K., MacGregor, I. J.  D., McCracken, M. E., McKinnon, B., Meyer, C. A., Mirazita, M., Mokeev, V. I., Montgomery, R. A., Munevar, E., Munoz Camacho, C., Murdoch, G., Nadel-Turonski, P., Niccolai, S., Osipenko, M., Ostrovidov, A. I., Park, K., Pasyuk, E., Peng, P., Phelps, W., Pisano, S., Pogorelko, O., Price, J. W., Prok, Y., Protopopescu, D., Puckett, A. J.  R., Raue, B. A., Ripani, M., Rosner, G., Rossi, P., Schumacher, R. A., Seder, E., Skorodumina, Iu., Smith, G. D., Sokhan, D., Sparveris, N., Stankovic, I., Stepanyan, S., Strakovsky, I. I., Strauch, S., Taiuti, M., Tian, Ye, Torayev, B., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N. K., Wei, X., Weinstein, L. B., Zachariou, N., Zhang, J., Zhao, Z. W., and Zonta, I. Target and beam-target spin asymmetries in exclusive pion electroproduction for Q2>1GeV2 . II. ep→eπ0p.  United States: N. p., 2017. 
Web.  doi:10.1103/PhysRevC.95.035207.

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                    Bosted, P. E., Amaryan, M. J., Anefalos Pereira, S., Avakian, H., Badui, R. A., Ball, J., Baltzell, N. A., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A. S., Briscoe, W. J., Bültmann, S., Burkert, V. D., Carman, D. S., Celentano, A., Chandavar, S., Charles, G., Ciullo, G., Clark, L., Colaneri, L., Cole, P. L., Contalbrigo, M., Crede, V., D'Angelo, A., De Vita, R., Deur, A., De Sanctis, E., Djalali, C., Dupre, R., Egiyan, H., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fanchini, E., Fedotov, G., Filippi, A., Fleming, J. A., Forest, T., Fradi, A., Gevorgyan, N., Ghandilyan, Y., Gilfoyle, G. P., Girod, F. X., Gleason, C., Gohn, W., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guidal, M., Hakobyan, H., Hattawy, M., Hicks, K., Holtrop, M., Hughes, S. M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jiang, H., Jo, H. S., Joo, K., Joosten, S., Khachatryan, G., Khandaker, M., Kim, A., Kim, W., Klein, F. J., Koirala, S., Kubarovsky, V., Kuhn, S. E., Lanza, L., Net, L. A., Lenisa, P., Livingston, K., MacGregor, I. J.  D., McCracken, M. E., McKinnon, B., Meyer, C. A., Mirazita, M., Mokeev, V. I., Montgomery, R. A., Munevar, E., Munoz Camacho, C., Murdoch, G., Nadel-Turonski, P., Niccolai, S., Osipenko, M., Ostrovidov, A. I., Park, K., Pasyuk, E., Peng, P., Phelps, W., Pisano, S., Pogorelko, O., Price, J. W., Prok, Y., Protopopescu, D., Puckett, A. J.  R., Raue, B. A., Ripani, M., Rosner, G., Rossi, P., Schumacher, R. A., Seder, E., Skorodumina, Iu., Smith, G. D., Sokhan, D., Sparveris, N., Stankovic, I., Stepanyan, S., Strakovsky, I. I., Strauch, S., Taiuti, M., Tian, Ye, Torayev, B., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N. K., Wei, X., Weinstein, L. B., Zachariou, N., Zhang, J., Zhao, Z. W., & Zonta, I. Target and beam-target spin asymmetries in exclusive pion electroproduction for Q2>1GeV2 . II. ep→eπ0p.  United States.  https://doi.org/10.1103/PhysRevC.95.035207

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                    Bosted, P. E., Amaryan, M. J., Anefalos Pereira, S., Avakian, H., Badui, R. A., Ball, J., Baltzell, N. A., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A. S., Briscoe, W. J., Bültmann, S., Burkert, V. D., Carman, D. S., Celentano, A., Chandavar, S., Charles, G., Ciullo, G., Clark, L., Colaneri, L., Cole, P. L., Contalbrigo, M., Crede, V., D'Angelo, A., De Vita, R., Deur, A., De Sanctis, E., Djalali, C., Dupre, R., Egiyan, H., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fanchini, E., Fedotov, G., Filippi, A., Fleming, J. A., Forest, T., Fradi, A., Gevorgyan, N., Ghandilyan, Y., Gilfoyle, G. P., Girod, F. X., Gleason, C., Gohn, W., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guidal, M., Hakobyan, H., Hattawy, M., Hicks, K., Holtrop, M., Hughes, S. M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jiang, H., Jo, H. S., Joo, K., Joosten, S., Khachatryan, G., Khandaker, M., Kim, A., Kim, W., Klein, F. J., Koirala, S., Kubarovsky, V., Kuhn, S. E., Lanza, L., Net, L. A., Lenisa, P., Livingston, K., MacGregor, I. J.  D., McCracken, M. E., McKinnon, B., Meyer, C. A., Mirazita, M., Mokeev, V. I., Montgomery, R. A., Munevar, E., Munoz Camacho, C., Murdoch, G., Nadel-Turonski, P., Niccolai, S., Osipenko, M., Ostrovidov, A. I., Park, K., Pasyuk, E., Peng, P., Phelps, W., Pisano, S., Pogorelko, O., Price, J. W., Prok, Y., Protopopescu, D., Puckett, A. J.  R., Raue, B. A., Ripani, M., Rosner, G., Rossi, P., Schumacher, R. A., Seder, E., Skorodumina, Iu., Smith, G. D., Sokhan, D., Sparveris, N., Stankovic, I., Stepanyan, S., Strakovsky, I. I., Strauch, S., Taiuti, M., Tian, Ye, Torayev, B., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N. K., Wei, X., Weinstein, L. B., Zachariou, N., Zhang, J., Zhao, Z. W., and Zonta, I. Mon .  
"Target and beam-target spin asymmetries in exclusive pion electroproduction for Q2>1GeV2 . II. ep→eπ0p".  United States.  https://doi.org/10.1103/PhysRevC.95.035207.  https://www.osti.gov/servlets/purl/1348182.

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@article{osti_1348182,

  title        = {Target and beam-target spin asymmetries in exclusive pion electroproduction for Q2>1GeV2 . II. ep→eπ0p},

  author       = {Bosted, P. E. and Amaryan, M. J. and Anefalos Pereira, S. and Avakian, H. and Badui, R. A. and Ball, J. and Baltzell, N. A. and Battaglieri, M. and Batourine, V. and Bedlinskiy, I. and Biselli, A. S. and Briscoe, W. J. and Bültmann, S. and Burkert, V. D. and Carman, D. S. and Celentano, A. and Chandavar, S. and Charles, G. and Ciullo, G. and Clark, L. and Colaneri, L. and Cole, P. L. and Contalbrigo, M. and Crede, V. and D'Angelo, A. and De Vita, R. and Deur, A. and De Sanctis, E. and Djalali, C. and Dupre, R. and Egiyan, H. and El Alaoui, A. and El Fassi, L. and Elouadrhiri, L. and Eugenio, P. and Fanchini, E. and Fedotov, G. and Filippi, A. and Fleming, J. A. and Forest, T. and Fradi, A. and Gevorgyan, N. and Ghandilyan, Y. and Gilfoyle, G. P. and Girod, F. X. and Gleason, C. and Gohn, W. and Golovatch, E. and Gothe, R. W. and Griffioen, K. A. and Guidal, M. and Hakobyan, H. and Hattawy, M. and Hicks, K. and Holtrop, M. and Hughes, S. M. and Ilieva, Y. and Ireland, D. G. and Ishkhanov, B. S. and Isupov, E. L. and Jiang, H. and Jo, H. S. and Joo, K. and Joosten, S. and Khachatryan, G. and Khandaker, M. and Kim, A. and Kim, W. and Klein, F. J. and Koirala, S. and Kubarovsky, V. and Kuhn, S. E. and Lanza, L. and Net, L. A. and Lenisa, P. and Livingston, K. and MacGregor, I. J.  D. and McCracken, M. E. and McKinnon, B. and Meyer, C. A. and Mirazita, M. and Mokeev, V. I. and Montgomery, R. A. and Munevar, E. and Munoz Camacho, C. and Murdoch, G. and Nadel-Turonski, P. and Niccolai, S. and Osipenko, M. and Ostrovidov, A. I. and Park, K. and Pasyuk, E. and Peng, P. and Phelps, W. and Pisano, S. and Pogorelko, O. and Price, J. W. and Prok, Y. and Protopopescu, D. and Puckett, A. J.  R. and Raue, B. A. and Ripani, M. and Rosner, G. and Rossi, P. and Schumacher, R. A. and Seder, E. and Skorodumina, Iu. and Smith, G. D. and Sokhan, D. and Sparveris, N. and Stankovic, I. and Stepanyan, S. and Strakovsky, I. I. and Strauch, S. and Taiuti, M. and Tian, Ye and Torayev, B. and Ungaro, M. and Voskanyan, H. and Voutier, E. and Walford, N. K. and Wei, X. and Weinstein, L. B. and Zachariou, N. and Zhang, J. and Zhao, Z. W. and Zonta, I.},

  abstractNote = {Beam-target double-spin asymmetries and target single-spin asymmetries were measured for the exclusive π0 electroproduction reaction γ*p → pπ0, expanding an analysis of the γ*p → nπ+ reaction from the same experiment. The results were obtained from scattering of 6-GeV longitudinally polarized electrons off longitudinally polarized protons using the CEBAF Large Acceptance Spectrometer at Jefferson Laboratory. The kinematic ranges covered are 1.1 < W < 3 GeV and 1 < Q2 < 6 GeV2. Results were obtained for about 5700 bins in W, Q2, cos(θ*), and φ*. The beam-target asymmetries were found to generally be greater than zero, with relatively modest φ* dependence. The target asymmetries exhibit very strong φ* dependence, with a change in sign occurring between results at low W and high W, in contrast to π+ electroproduction. Reasonable agreement is found with phenomenological fits to previous data for W <1.6 GeV, but significant differences are seen at higher W. When combined with cross-sectional measurements, as well as π+ observables, the present results will provide powerful constraints on nucleon resonance amplitudes at moderate and large values of Q2, for resonances with masses as high as 2.4 GeV.},

  doi          = {10.1103/PhysRevC.95.035207},

  journal      = {Physical Review C},

  number       = 3,

  volume       = 95,

  place        = {United States},

  year         = {Mon Mar 20 00:00:00 EDT 2017},

  month        = {Mon Mar 20 00:00:00 EDT 2017}

}

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Measurements of $e p \to e^{'} π^{+} π^{-} p^{'}$ cross sections with CLAS at $1.40 GeV < W < 2.0$ GeV and $2.0 {GeV}^{2} < Q^{2} < 5.0 {GeV}^{2}$

Journal Article Isupov, E. L. ; Burkert, V. D. ; Carman, D. S. ; ... - Physical Review C

This paper reports new exclusive cross sections formore »« less
https://doi.org/10.1103/PhysRevC.96.025209

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Title: Target and beam-target spin asymmetries in exclusive pion electroproduction for Q2 > 1 GeV 2 . II. e p → e π0 p

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Target and beam-target spin asymmetries in exclusive π + and π − electroproduction with 1.6- to 5.7-GeV electrons journal, November 2016

Measurement of ep → ep π 0 beam spin asymmetries above the resonance region journal, April 2008

Multipole amplitudes of pion photoproduction on nucleons up to 2 GeV using dispersion relations and the unitary isobar model journal, January 2003

The CEBAF large acceptance spectrometer (CLAS) journal, May 2003

Neutral pion electroproduction in the resonance region at high Q 2 journal, September 2009

Single and double spin asymmetries for deeply virtual Compton scattering measured with CLAS and a longitudinally polarized proton target journal, March 2015

Electroexcitation of nucleon resonances from CLAS data on single pion electroproduction journal, November 2009

First measurement of target and double spin asymmetries for e → p → → ep π 0 in the nucleon resonance region above the Δ ( 1232 ) journal, October 2008

Longitudinal Target-Spin Asymmetries for Deeply Virtual Compton Scattering journal, January 2015

Electroproduction of the Δ ( 1232 ) Resonance at High Momentum Transfer journal, January 1999

A unitary isobar model for pion photo- and electroproduction on the proton up to 1 GeV journal, January 1999

Exclusive π0 electroproduction in the resonance region at high Q2 conference, January 2012

e p → ep π 0 reaction studied in the Δ ( 1232 ) mass region using polarization asymmetries journal, September 2003

Precision measurements of g 1 of the proton and of the deuteron with 6 GeV electrons journal, August 2014

The spin structure of the nucleon journal, June 2019

The spin structure of the nucleon journal, January 2005

The spin structure of the nucleon journal, January 1994

The Spin Structure of the Nucleon: Proceeding of International School of Nucleon Structure: 1st Course conference, April 2017

Title: Target and beam-target spin asymmetries in exclusive pion electroproduction for $Q^{2} > 1 {GeV}^{2}$ . II. $e p \to e π^{0} p$

Target and beam-target spin asymmetries in exclusive $π^{+}$ and $π^{-}$ electroproduction with 1.6- to 5.7-GeV electrons
journal, November 2016

Measurement of $ep \to ep π^{0}$ beam spin asymmetries above the resonance region
journal, April 2008

Multipole amplitudes of pion photoproduction on nucleons up to $2 GeV$ using dispersion relations and the unitary isobar model
journal, January 2003

The CEBAF large acceptance spectrometer (CLAS)
journal, May 2003

Neutral pion electroproduction in the resonance region at high $Q^{2}$
journal, September 2009

Single and double spin asymmetries for deeply virtual Compton scattering measured with CLAS and a longitudinally polarized proton target
journal, March 2015

Electroexcitation of nucleon resonances from CLAS data on single pion electroproduction
journal, November 2009

First measurement of target and double spin asymmetries for $\vec{e} \vec{p} \to ep π^{0}$ in the nucleon resonance region above the $Δ (1232)$
journal, October 2008

Longitudinal Target-Spin Asymmetries for Deeply Virtual Compton Scattering
journal, January 2015

Electroproduction of the $Δ (1232)$ Resonance at High Momentum Transfer
journal, January 1999

A unitary isobar model for pion photo- and electroproduction on the proton up to 1 GeV
journal, January 1999

Exclusive π0 electroproduction in the resonance region at high Q2
conference, January 2012

$e \vec{p} ep π^{0}$ reaction studied in the $Δ (1232)$ mass region using polarization asymmetries
journal, September 2003

Precision measurements of $g_{1}$ of the proton and of the deuteron with 6 GeV electrons
journal, August 2014

The spin structure of the nucleon
journal, June 2019

The spin structure of the nucleon
journal, January 2005

The spin structure of the nucleon
journal, January 1994

The Spin Structure of the Nucleon: Proceeding of International School of Nucleon Structure: 1st Course
conference, April 2017