Measurement of the generalized form factors near threshold via γ*p → nπ+ at high Q2
Abstract
We report the first extraction of the pion-nucleon multipoles near the production threshold for the nπ+ channel at relatively high momentum transfer (Q2 up to 4.2 GeV2). The dominance of the s-wave transverse multipole (E0+), expected in this region, allowed us to access the generalized form factor G1 within the light-cone sum rule (LCSR) framework as well as the axial form factor GA. The data analyzed in this work were collected by the nearly 4π CEBAF Large Acceptance Spectrometer (CLAS) using a 5.754-GeV electron beam on a proton target. The differential cross section and the π-N multipole E0+/GD were measured using two different methods, the LCSR and a direct multipole fit. The results from the two methods are found to be consistent and almost Q2 independent.
- Authors:
- more »
- Publication Date:
- Research Org.:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1040720
- Report Number(s):
- JLAB-PHY-12-1412; DOE/OR/23177-1959; arXiv:1201.0903
Journal ID: ISSN 0556-2813; PRVCAN; TRN: US1202538
- Grant/Contract Number:
- AC05-06OR23177
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review C, Nuclear Physics
- Additional Journal Information:
- Journal Volume: 85; Journal Issue: 3; Related Information: JLAB Experiment Number: E99-107; Journal ID: ISSN 0556-2813
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; DIFFERENTIAL CROSS SECTIONS; ELECTRON BEAMS; FORM FACTORS; LIGHT CONE; MOMENTUM TRANSFER; MULTIPOLES; PRODUCTION; PROTONS; SPECTROMETERS; SUM RULES
Citation Formats
Park, K., Adhikari, K. P., Adikaram, D., Anghinolfi, M., Baghdasaryan, H., Ball, J., Battaglieri, M., Batourine, V., Bedlinskiy, I., Bennett, R. P., Biselli, A. S., Bookwalter, C., Boiarinov, S., Branford, D., Briscoe, W. J., Brooks, W. K., Burkert, V. D., Carman, D. S., Celentano, A., Chandavar, S., Charles, G., Cole, P. L., Contalbrigo, M., Crede, V., D'Angelo, A., Daniel, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Doughty, D., Dupre, R., El Alaoui, A., El Fassi, L., Euginio, P., Fedotov, G., Fradi, A., Gabrielyan, M. Y., Gevorgyan, N., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Goetz, J. T., Gohn, W., Golovatch, E., Graham, L., Griffioen, K. A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Heddle, D., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jenkins, D., Jo, H. S., Joo, K., Khandaker, M., Khertarpal, P., Kim, A., Kim, W., Klein, F. J., Kubarovsky, A., Kubarovsky, V., Kuhn, S. E., Kuleshov, S. V., Kvaltine, N. D., Livingston, K., Lu, H. Y., MacGregor, J. D., Markov, N., Mayer, M., McKinnon, B., Mestayer, M. D., Meyer, C. A., Mineeva, T., Mirazita, M., Mokeev, V., Moutarde, H., Munevar, E., Nadel-Turonski, P., Nasseripour, R., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A. I, Paolone, M., Pappalardo, L., Paremuzyan, R., Park, S., Anefalos Pereira, S., Phelps, E., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J. W., Procureur, S., Prok, Y., Ricco, G., Rimal, D., Ripani, M., Ritchie, B. G., Rosner, G., Rossi, P., Sabati ee, F., Saini, M. S., Salgado, C., Schott, D., Schumacher, R. A., Seraydaryan, H., Sharabian, Y. G., Smith, E. S., Smith, G. D., Sober, D. I., Sokhan, D., Stepanyan, S. S., Stepanyan, S., Stoler, P., Strakovsky, I. I., Strauch, S., Taiuti, M., Tang, W., Taylor, C. E., Tian, Y., Tkachenko, S., Trivedi, A., Ungaro, M., Vernarsky, B., Vlassov, A. V., Voutier, E., Watts, D. P., Weygand, D. P., Wood, M. H., Zachariou, N., Zhao, B., and Zhao, Z. W. Measurement of the generalized form factors near threshold via γ*p → nπ+ at high Q2. United States: N. p., 2012.
Web. doi:10.1103/PhysRevC.85.035208.
Park, K., Adhikari, K. P., Adikaram, D., Anghinolfi, M., Baghdasaryan, H., Ball, J., Battaglieri, M., Batourine, V., Bedlinskiy, I., Bennett, R. P., Biselli, A. S., Bookwalter, C., Boiarinov, S., Branford, D., Briscoe, W. J., Brooks, W. K., Burkert, V. D., Carman, D. S., Celentano, A., Chandavar, S., Charles, G., Cole, P. L., Contalbrigo, M., Crede, V., D'Angelo, A., Daniel, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Doughty, D., Dupre, R., El Alaoui, A., El Fassi, L., Euginio, P., Fedotov, G., Fradi, A., Gabrielyan, M. Y., Gevorgyan, N., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Goetz, J. T., Gohn, W., Golovatch, E., Graham, L., Griffioen, K. A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Heddle, D., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jenkins, D., Jo, H. S., Joo, K., Khandaker, M., Khertarpal, P., Kim, A., Kim, W., Klein, F. J., Kubarovsky, A., Kubarovsky, V., Kuhn, S. E., Kuleshov, S. V., Kvaltine, N. D., Livingston, K., Lu, H. Y., MacGregor, J. D., Markov, N., Mayer, M., McKinnon, B., Mestayer, M. D., Meyer, C. A., Mineeva, T., Mirazita, M., Mokeev, V., Moutarde, H., Munevar, E., Nadel-Turonski, P., Nasseripour, R., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A. I, Paolone, M., Pappalardo, L., Paremuzyan, R., Park, S., Anefalos Pereira, S., Phelps, E., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J. W., Procureur, S., Prok, Y., Ricco, G., Rimal, D., Ripani, M., Ritchie, B. G., Rosner, G., Rossi, P., Sabati ee, F., Saini, M. S., Salgado, C., Schott, D., Schumacher, R. A., Seraydaryan, H., Sharabian, Y. G., Smith, E. S., Smith, G. D., Sober, D. I., Sokhan, D., Stepanyan, S. S., Stepanyan, S., Stoler, P., Strakovsky, I. I., Strauch, S., Taiuti, M., Tang, W., Taylor, C. E., Tian, Y., Tkachenko, S., Trivedi, A., Ungaro, M., Vernarsky, B., Vlassov, A. V., Voutier, E., Watts, D. P., Weygand, D. P., Wood, M. H., Zachariou, N., Zhao, B., & Zhao, Z. W. Measurement of the generalized form factors near threshold via γ*p → nπ+ at high Q2. United States. https://doi.org/10.1103/PhysRevC.85.035208
Park, K., Adhikari, K. P., Adikaram, D., Anghinolfi, M., Baghdasaryan, H., Ball, J., Battaglieri, M., Batourine, V., Bedlinskiy, I., Bennett, R. P., Biselli, A. S., Bookwalter, C., Boiarinov, S., Branford, D., Briscoe, W. J., Brooks, W. K., Burkert, V. D., Carman, D. S., Celentano, A., Chandavar, S., Charles, G., Cole, P. L., Contalbrigo, M., Crede, V., D'Angelo, A., Daniel, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Doughty, D., Dupre, R., El Alaoui, A., El Fassi, L., Euginio, P., Fedotov, G., Fradi, A., Gabrielyan, M. Y., Gevorgyan, N., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Goetz, J. T., Gohn, W., Golovatch, E., Graham, L., Griffioen, K. A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Heddle, D., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jenkins, D., Jo, H. S., Joo, K., Khandaker, M., Khertarpal, P., Kim, A., Kim, W., Klein, F. J., Kubarovsky, A., Kubarovsky, V., Kuhn, S. E., Kuleshov, S. V., Kvaltine, N. D., Livingston, K., Lu, H. Y., MacGregor, J. D., Markov, N., Mayer, M., McKinnon, B., Mestayer, M. D., Meyer, C. A., Mineeva, T., Mirazita, M., Mokeev, V., Moutarde, H., Munevar, E., Nadel-Turonski, P., Nasseripour, R., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A. I, Paolone, M., Pappalardo, L., Paremuzyan, R., Park, S., Anefalos Pereira, S., Phelps, E., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J. W., Procureur, S., Prok, Y., Ricco, G., Rimal, D., Ripani, M., Ritchie, B. G., Rosner, G., Rossi, P., Sabati ee, F., Saini, M. S., Salgado, C., Schott, D., Schumacher, R. A., Seraydaryan, H., Sharabian, Y. G., Smith, E. S., Smith, G. D., Sober, D. I., Sokhan, D., Stepanyan, S. S., Stepanyan, S., Stoler, P., Strakovsky, I. I., Strauch, S., Taiuti, M., Tang, W., Taylor, C. E., Tian, Y., Tkachenko, S., Trivedi, A., Ungaro, M., Vernarsky, B., Vlassov, A. V., Voutier, E., Watts, D. P., Weygand, D. P., Wood, M. H., Zachariou, N., Zhao, B., and Zhao, Z. W. Mon .
"Measurement of the generalized form factors near threshold via γ*p → nπ+ at high Q2". United States. https://doi.org/10.1103/PhysRevC.85.035208. https://www.osti.gov/servlets/purl/1040720.
@article{osti_1040720,
title = {Measurement of the generalized form factors near threshold via γ*p → nπ+ at high Q2},
author = {Park, K. and Adhikari, K. P. and Adikaram, D. and Anghinolfi, M. and Baghdasaryan, H. and Ball, J. and Battaglieri, M. and Batourine, V. and Bedlinskiy, I. and Bennett, R. P. and Biselli, A. S. and Bookwalter, C. and Boiarinov, S. and Branford, D. and Briscoe, W. J. and Brooks, W. K. and Burkert, V. D. and Carman, D. S. and Celentano, A. and Chandavar, S. and Charles, G. and Cole, P. L. and Contalbrigo, M. and Crede, V. and D'Angelo, A. and Daniel, A. and Dashyan, N. and De Vita, R. and De Sanctis, E. and Deur, A. and Djalali, C. and Doughty, D. and Dupre, R. and El Alaoui, A. and El Fassi, L. and Euginio, P. and Fedotov, G. and Fradi, A. and Gabrielyan, M. Y. and Gevorgyan, N. and Gilfoyle, G. P. and Giovanetti, K. L. and Girod, F. X. and Goetz, J. T. and Gohn, W. and Golovatch, E. and Graham, L. and Griffioen, K. A. and Guidal, M. and Guo, L. and Hafidi, K. and Hakobyan, H. and Hanretty, C. and Heddle, D. and Hicks, K. and Holtrop, M. and Ilieva, Y. and Ireland, D. G. and Ishkhanov, B. S. and Isupov, E. L. and Jenkins, D. and Jo, H. S. and Joo, K. and Khandaker, M. and Khertarpal, P. and Kim, A. and Kim, W. and Klein, F. J. and Kubarovsky, A. and Kubarovsky, V. and Kuhn, S. E. and Kuleshov, S. V. and Kvaltine, N. D. and Livingston, K. and Lu, H. Y. and MacGregor, J. D. and Markov, N. and Mayer, M. and McKinnon, B. and Mestayer, M. D. and Meyer, C. A. and Mineeva, T. and Mirazita, M. and Mokeev, V. and Moutarde, H. and Munevar, E. and Nadel-Turonski, P. and Nasseripour, R. and Niccolai, S. and Niculescu, G. and Niculescu, I. and Osipenko, M. and Ostrovidov, A. I and Paolone, M. and Pappalardo, L. and Paremuzyan, R. and Park, S. and Anefalos Pereira, S. and Phelps, E. and Pisano, S. and Pogorelko, O. and Pozdniakov, S. and Price, J. W. and Procureur, S. and Prok, Y. and Ricco, G. and Rimal, D. and Ripani, M. and Ritchie, B. G. and Rosner, G. and Rossi, P. and Sabati ee, F. and Saini, M. S. and Salgado, C. and Schott, D. and Schumacher, R. A. and Seraydaryan, H. and Sharabian, Y. G. and Smith, E. S. and Smith, G. D. and Sober, D. I. and Sokhan, D. and Stepanyan, S. S. and Stepanyan, S. and Stoler, P. and Strakovsky, I. I. and Strauch, S. and Taiuti, M. and Tang, W. and Taylor, C. E. and Tian, Y. and Tkachenko, S. and Trivedi, A. and Ungaro, M. and Vernarsky, B. and Vlassov, A. V. and Voutier, E. and Watts, D. P. and Weygand, D. P. and Wood, M. H. and Zachariou, N. and Zhao, B. and Zhao, Z. W.},
abstractNote = {We report the first extraction of the pion-nucleon multipoles near the production threshold for the nπ+ channel at relatively high momentum transfer (Q2 up to 4.2 GeV2). The dominance of the s-wave transverse multipole (E0+), expected in this region, allowed us to access the generalized form factor G1 within the light-cone sum rule (LCSR) framework as well as the axial form factor GA. The data analyzed in this work were collected by the nearly 4π CEBAF Large Acceptance Spectrometer (CLAS) using a 5.754-GeV electron beam on a proton target. The differential cross section and the π-N multipole E0+/GD were measured using two different methods, the LCSR and a direct multipole fit. The results from the two methods are found to be consistent and almost Q2 independent.},
doi = {10.1103/PhysRevC.85.035208},
journal = {Physical Review C, Nuclear Physics},
number = 3,
volume = 85,
place = {United States},
year = {Mon Mar 26 00:00:00 EDT 2012},
month = {Mon Mar 26 00:00:00 EDT 2012}
}
Web of Science
Works referenced in this record:
A Theorem on Photomeson Production near Threshold and the Suppression of Pairs in Pseudoscalar Meson Theory
journal, January 1954
- Kroll, Norman M.; Ruderman, Malvin A.
- Physical Review, Vol. 93, Issue 1
Chirality Conservation and Soft Pion Production
journal, February 1962
- Nambu, Y.; Lurié, D.
- Physical Review, Vol. 125, Issue 4
Low-energy theorems for photo- and electropion production at threshold
journal, January 1972
- Vainshtein, A. I.; Zakharov, V. I.
- Nuclear Physics B, Vol. 36, Issue 2
Precise measurement of neutral-pion photoproduction on the proton near threshold
journal, December 1986
- Mazzucato, E.; Argan, P.; Audit, G.
- Physical Review Letters, Vol. 57, Issue 25
Measurement of the p(γ,π^{0}) cross section at threshold
journal, October 1990
- Beck, R.; Kalleicher, F.; Schoch, B.
- Physical Review Letters, Vol. 65, Issue 15
Electroproduction of on the proton near threshold
journal, November 1992
- Welch, T. P.; Karen, P. H.; Mitchell, J. H.
- Physical Review Letters, Vol. 69, Issue 19
Pion electroproduction at threshold and PCAC
journal, November 1991
- Scherer, S.; Koch, J. H.
- Nuclear Physics A, Vol. 534, Issue 3-4
Chiral Dynamics in Nucleons and Nuclei
journal, June 1995
- Bernard, V.; Kaiser, N.; MeißNer, Ulf-G.
- International Journal of Modern Physics E, Vol. 04, Issue 02
Threshold pion photoproduction on nucleons
journal, March 1992
- Dreschsel, D.; Tiator, L.
- Journal of Physics G: Nuclear and Particle Physics, Vol. 18, Issue 3
Determining the axial radius of the nucleon from data on pion electroproduction
journal, September 1992
- Bernard, Véronique; Kaiser, Norbert; Meissner, Ulf-G.
- Physical Review Letters, Vol. 69, Issue 13
Chiral symmetry and threshold electroproduction
journal, January 1993
- Bernard, Véronique; Kaiser, Norbert; Lee, T. -S. H.
- Physical Review Letters, Vol. 70, Issue 4
Soft-Pion Theorem for Hard Near-Threshold Pion Production
journal, June 2001
- Pobylitsa, P. V.; Polyakov, M. V.; Strikman, M.
- Physical Review Letters, Vol. 87, Issue 2
Factorization and asymptotic behaviour of pion form factor in QCD
journal, July 1980
- Efremov, A. V.; Radyushkin, A. V.
- Physics Letters B, Vol. 94, Issue 2
Exclusive processes in perturbative quantum chromodynamics
journal, November 1980
- Lepage, G. Peter; Brodsky, Stanley J.
- Physical Review D, Vol. 22, Issue 9
Threshold pion electroproduction at large momentum transfers
journal, February 2008
- Braun, V. M.; Ivanov, D. Yu.; Peters, A.
- Physical Review D, Vol. 77, Issue 3
Light-cone sum rules for the nucleon form factors
journal, March 2002
- Braun, V. M.; Lenz, A.; Mahnke, N.
- Physical Review D, Vol. 65, Issue 7
B-meson exclusive decays into baryons
journal, November 1990
- Chernyak, V. L.; Zhitnitsky, I. R.
- Nuclear Physics B, Vol. 345, Issue 1
Radiative decay σ+ → pγ in quantum chromodynamics
journal, January 1989
- Balitsky, I. I.; Braun, V. M.; Kolesnichenko, A. V.
- Nuclear Physics B, Vol. 312, Issue 3
Deep inelastic pion electroproduction at threshold
journal, January 2007
- Braun, V. M.; Ivanov, D. Yu.; Lenz, A.
- Physical Review D, Vol. 75, Issue 1
Empirical fit to the nucleon electromagnetic form factors
journal, January 1995
- Bosted, P. E.
- Physical Review C, Vol. 51, Issue 1
Nucleon electromagnetic form factors and polarization observables in space-like and time-like regions
journal, May 2005
- Tomasi-Gustafsson, E.; Lacroix, F.; Duterte, C.
- The European Physical Journal A, Vol. 24, Issue 3
The CEBAF large acceptance spectrometer (CLAS)
journal, May 2003
- Mecking, B. A.; Adams, G.; Ahmad, S.
- Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 503, Issue 3
Cross sections and beam asymmetries for in the nucleon resonance region for GeV
journal, January 2008
- Park, K.; Burkert, V. D.; Kim, W.
- Physical Review C, Vol. 77, Issue 1
A unitary isobar model for pion photo- and electroproduction on the proton up to 1 GeV
journal, January 1999
- Drechsel, D.; Hanstein, O.; Kamalov, S. S.
- Nuclear Physics A, Vol. 645, Issue 1
QED radiative corrections in processes of exclusive pion electroproduction
journal, October 2002
- Afanasev, A.; Akushevich, I.; Burkert, V.
- Physical Review D, Vol. 66, Issue 7
Pion Cloud and the Dependence of Transition Form Factors
journal, November 1999
- Kamalov, S. S.; Nan Yang, Shin
- Physical Review Letters, Vol. 83, Issue 22
Unitary isobar model --MAID2007
journal, October 2007
- Drechsel, D.; Kamalov, S. S.; Tiator, L.
- The European Physical Journal A, Vol. 34, Issue 1
The deuteron A(Q2) structure function and the neutron electric form factor
journal, April 1990
- Platchkov, S.; Amroun, A.; Auffret, S.
- Nuclear Physics A, Vol. 510, Issue 4
Simple parametrization of nucleon form factors
journal, December 2004
- Kelly, J. J.
- Physical Review C, Vol. 70, Issue 6
Precise Measurement of the Neutron Magnetic Form Factor in the Few- Region
journal, May 2009
- Lachniet, J.; Afanasev, A.; Arenhövel, H.
- Physical Review Letters, Vol. 102, Issue 19
How to extract the resonance contributions from the amplitudes of pion electroproduction on nucleons
journal, March 1998
- Aznauryan, I. G.
- Physical Review D, Vol. 57, Issue 5
Works referencing / citing this record:
Nucleon Form Factors and Distribution Amplitudes in QCD
text, January 2013
- Anikin, I. V.; Braun, V. M.; Offen, N.
- arXiv