Exclusive π+ electroproduction off the proton from low to high -t

Jefferson Lab Fπ -2 Collaboration

doi:10.1103/PhysRevC.100.065204

Exclusive π+ electroproduction off the proton from low to high -t

Jefferson Lab Fπ -2 Collaboration

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Abstract

Background: Measurements of exclusive meson production are a useful tool in the study of hadronic structure. In particular, one can discern the relevant degrees of freedom at different distance scales through these studies. Purpose: To study the transition between nonperturbative and perturbative quantum chromodynamics as the square of four-momentum transfer to the struck proton, -t, is increased. Method: Cross sections for the H1(e,e′π+)n reaction were measured over the -t range of 0.272 to 2.127 GeV2 with limited azimuthal coverage at fixed beam energy of 4.709 GeV, Q2 of 2.4 GeV2, and W of 2.0 GeV at the Thomas Jefferson National Accelerator Facility (JLab) Hall C. Results: The -t dependence of the measured π+ electroproduction cross section generally agrees with prior data from JLab Halls B and C. The data are consistent with a Regge amplitude-based theoretical model but show poor agreement with a generalized parton distribution-based model. Conclusion: The agreement of cross sections with prior data implies small contribution from the interference terms, and the confirmation of the change in t slopes between the low- and high - t regions previously observed in photoproduction indicates the changing nature of the electroproduction reaction in our kinematic regime.

Original language	English
Article number	065204
Journal	Physical Review C
Volume	100
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevC.100.065204
Publication status	Published - 11 Dec 2019

Funding

This work was supported by the Natural Sciences and Engineering Research Council of Canada (NSERC), Grant No. SAPIN-2016-00031 and in part by the US Department of Energy. We acknowledge additional research grants from the US National Science Foundation, NATO, and FOM (Netherlands). We thank Dr. K. Park for sharing his results from JLab Hall B and Dr. C. Weiss for stimulating discussions on the topic. We also thank Dr. T. K. Choi, Dr. K. J. Kong, and Dr. B. G Yu for their Regge amplitude-based CKY model, as well as Dr. S. V. Goloskokov and Dr. P. Kroll of the GPD-based GK model for sharing their model calculations and many informative discussions.

Funders	Funder number
US Department of Energy
US National Science Foundation
National Science Foundation	1913257, 1714133
U.S. Department of Energy
North Atlantic Treaty Organization
Natural Sciences and Engineering Research Council of Canada	SAPIN-2016-00031
Stichting voor Fundamenteel Onderzoek der Materie
Foundation for Fundamental Research on Matter

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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@article{dbb00fd50f054cd09588abed4aabd1d5,

title = "Exclusive π+ electroproduction off the proton from low to high -t",

abstract = "Background: Measurements of exclusive meson production are a useful tool in the study of hadronic structure. In particular, one can discern the relevant degrees of freedom at different distance scales through these studies. Purpose: To study the transition between nonperturbative and perturbative quantum chromodynamics as the square of four-momentum transfer to the struck proton, -t, is increased. Method: Cross sections for the H1(e,e′π+)n reaction were measured over the -t range of 0.272 to 2.127 GeV2 with limited azimuthal coverage at fixed beam energy of 4.709 GeV, Q2 of 2.4 GeV2, and W of 2.0 GeV at the Thomas Jefferson National Accelerator Facility (JLab) Hall C. Results: The -t dependence of the measured π+ electroproduction cross section generally agrees with prior data from JLab Halls B and C. The data are consistent with a Regge amplitude-based theoretical model but show poor agreement with a generalized parton distribution-based model. Conclusion: The agreement of cross sections with prior data implies small contribution from the interference terms, and the confirmation of the change in t slopes between the low- and high - t regions previously observed in photoproduction indicates the changing nature of the electroproduction reaction in our kinematic regime.",

author = "S. Basnet and Huber, {G. M.} and Li, {W. B.} and Blok, {H. P.} and D. Gaskell and T. Horn and K. Aniol and J. Arrington and Beise, {E. J.} and W. Boeglin and Brash, {E. J.} and H. Breuer and Chang, {C. C.} and Christy, {M. E.} and R. Ent and E. Gibson and Holt, {R. J.} and S. Jin and Jones, {M. K.} and Keppel, {C. E.} and W. Kim and King, {P. M.} and V. Kovaltchouk and J. Liu and Lolos, {G. J.} and MacK, {D. J.} and Margaziotis, {D. J.} and P. Markowitz and A. Matsumura and D. Meekins and T. Miyoshi and H. Mkrtchyan and I. Niculescu and Y. Okayasu and L. Pentchev and C. Perdrisat and D. Potterveld and V. Punjabi and P. Reimer and J. Reinhold and J. Roche and A. Sarty and Smith, {G. R.} and V. Tadevosyan and Tang, {L. G.} and V. Tvaskis and J. Volmer and W. Vulcan and G. Warren and Wood, {S. A.} and C. Xu and X. Zheng and {Jefferson Lab Fπ -2 Collaboration}",

year = "2019",

month = dec,

day = "11",

doi = "10.1103/PhysRevC.100.065204",

language = "English",

volume = "100",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

number = "6",

}

TY - JOUR

T1 - Exclusive π+ electroproduction off the proton from low to high -t

AU - Basnet, S.

AU - Huber, G. M.

AU - Li, W. B.

AU - Blok, H. P.

AU - Gaskell, D.

AU - Horn, T.

AU - Aniol, K.

AU - Arrington, J.

AU - Beise, E. J.

AU - Boeglin, W.

AU - Brash, E. J.

AU - Breuer, H.

AU - Chang, C. C.

AU - Christy, M. E.

AU - Ent, R.

AU - Gibson, E.

AU - Holt, R. J.

AU - Jin, S.

AU - Jones, M. K.

AU - Keppel, C. E.

AU - Kim, W.

AU - King, P. M.

AU - Kovaltchouk, V.

AU - Liu, J.

AU - Lolos, G. J.

AU - MacK, D. J.

AU - Margaziotis, D. J.

AU - Markowitz, P.

AU - Matsumura, A.

AU - Meekins, D.

AU - Miyoshi, T.

AU - Mkrtchyan, H.

AU - Niculescu, I.

AU - Okayasu, Y.

AU - Pentchev, L.

AU - Perdrisat, C.

AU - Potterveld, D.

AU - Punjabi, V.

AU - Reimer, P.

AU - Reinhold, J.

AU - Roche, J.

AU - Sarty, A.

AU - Smith, G. R.

AU - Tadevosyan, V.

AU - Tang, L. G.

AU - Tvaskis, V.

AU - Volmer, J.

AU - Vulcan, W.

AU - Warren, G.

AU - Wood, S. A.

AU - Xu, C.

AU - Zheng, X.

AU - Jefferson Lab Fπ -2 Collaboration

PY - 2019/12/11

Y1 - 2019/12/11

N2 - Background: Measurements of exclusive meson production are a useful tool in the study of hadronic structure. In particular, one can discern the relevant degrees of freedom at different distance scales through these studies. Purpose: To study the transition between nonperturbative and perturbative quantum chromodynamics as the square of four-momentum transfer to the struck proton, -t, is increased. Method: Cross sections for the H1(e,e′π+)n reaction were measured over the -t range of 0.272 to 2.127 GeV2 with limited azimuthal coverage at fixed beam energy of 4.709 GeV, Q2 of 2.4 GeV2, and W of 2.0 GeV at the Thomas Jefferson National Accelerator Facility (JLab) Hall C. Results: The -t dependence of the measured π+ electroproduction cross section generally agrees with prior data from JLab Halls B and C. The data are consistent with a Regge amplitude-based theoretical model but show poor agreement with a generalized parton distribution-based model. Conclusion: The agreement of cross sections with prior data implies small contribution from the interference terms, and the confirmation of the change in t slopes between the low- and high - t regions previously observed in photoproduction indicates the changing nature of the electroproduction reaction in our kinematic regime.

AB - Background: Measurements of exclusive meson production are a useful tool in the study of hadronic structure. In particular, one can discern the relevant degrees of freedom at different distance scales through these studies. Purpose: To study the transition between nonperturbative and perturbative quantum chromodynamics as the square of four-momentum transfer to the struck proton, -t, is increased. Method: Cross sections for the H1(e,e′π+)n reaction were measured over the -t range of 0.272 to 2.127 GeV2 with limited azimuthal coverage at fixed beam energy of 4.709 GeV, Q2 of 2.4 GeV2, and W of 2.0 GeV at the Thomas Jefferson National Accelerator Facility (JLab) Hall C. Results: The -t dependence of the measured π+ electroproduction cross section generally agrees with prior data from JLab Halls B and C. The data are consistent with a Regge amplitude-based theoretical model but show poor agreement with a generalized parton distribution-based model. Conclusion: The agreement of cross sections with prior data implies small contribution from the interference terms, and the confirmation of the change in t slopes between the low- and high - t regions previously observed in photoproduction indicates the changing nature of the electroproduction reaction in our kinematic regime.

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U2 - 10.1103/PhysRevC.100.065204

DO - 10.1103/PhysRevC.100.065204

M3 - Article

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SN - 2469-9985

VL - 100

JO - Physical Review C

JF - Physical Review C

IS - 6

M1 - 065204

ER -

Exclusive π+ electroproduction off the proton from low to high -t

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