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Article ; Online: Production of Highly Polarized Positrons Using Polarized Electrons at MeV Energies.

Abbott, D / Adderley, P / Adeyemi, A / Aguilera, P / Ali, M / Areti, H / Baylac, M / Benesch, J / Bosson, G / Cade, B / Camsonne, A / Cardman, L S / Clark, J / Cole, P / Covert, S / Cuevas, C / Dadoun, O / Dale, D / Dong, H /

Dumas, J / Fanchini, E / Forest, T / Forman, E / Freyberger, A / Froidefond, E / Golge, S / Grames, J / Guèye, P / Hansknecht, J / Harrell, P / Hoskins, J / Hyde, C / Josey, B / Kazimi, R / Kim, Y / Machie, D / Mahoney, K / Mammei, R / Marton, M / McCarter, J / McCaughan, M / McHugh, M / McNulty, D / Mesick, K E / Michaelides, T / Michaels, R / Moffit, B / Moser, D / Muñoz Camacho, C / Muraz, J-F / Opper, A / Poelker, M / Réal, J-S / Richardson, L / Setiniyaz, S / Stutzman, M / Suleiman, R / Tennant, C / Tsai, C / Turner, D / Ungaro, M / Variola, A / Voutier, E / Wang, Y / Zhang, Y

Physical review letters

2016 Volume 116, Issue 21, Page(s) 214801

Abstract: The Polarized Electrons for Polarized Positrons experiment at the injector of the Continuous Electron Beam Accelerator Facility has demonstrated for the first time the efficient transfer of polarization from electrons to positrons produced by the ... ...

Abstract	The Polarized Electrons for Polarized Positrons experiment at the injector of the Continuous Electron Beam Accelerator Facility has demonstrated for the first time the efficient transfer of polarization from electrons to positrons produced by the polarized bremsstrahlung radiation induced by a polarized electron beam in a high-Z target. Positron polarization up to 82% have been measured for an initial electron beam momentum of 8.19 MeV/c, limited only by the electron beam polarization. This technique extends polarized positron capabilities from GeV to MeV electron beams, and opens access to polarized positron beam physics to a wide community.
Language	English
Publishing date	2016-05-27
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.116.214801
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Article ; Online: A glimpse of gluons through deeply virtual compton scattering on the proton.

Defurne, M / Jiménez-Argüello, A Martí / Ahmed, Z / Albataineh, H / Allada, K / Aniol, K A / Bellini, V / Benali, M / Boeglin, W / Bertin, P / Brossard, M / Camsonne, A / Canan, M / Chandavar, S / Chen, C / Chen, J-P / de Jager, C W / de Leo, R / Desnault, C /

Deur, A / El Fassi, L / Ent, R / Flay, D / Friend, M / Fuchey, E / Frullani, S / Garibaldi, F / Gaskell, D / Giusa, A / Glamazdin, O / Golge, S / Gomez, J / Hansen, O / Higinbotham, D / Holmstrom, T / Horn, T / Huang, J / Huang, M / Hyde, C E / Iqbal, S / Itard, F / Kang, H / Kelleher, A / Keppel, C / Koirala, S / Korover, I / LeRose, J J / Lindgren, R / Long, E / Magne, M / Mammei, J / Margaziotis, D J / Markowitz, P / Mazouz, M / Meddi, F / Meekins, D / Michaels, R / Mihovilovic, M / Camacho, C Muñoz / Nadel-Turonski, P / Nuruzzaman, N / Paremuzyan, R / Puckett, A / Punjabi, V / Qiang, Y / Rakhman, A / Rashad, M N H / Riordan, S / Roche, J / Russo, G / Sabatié, F / Saenboonruang, K / Saha, A / Sawatzky, B / Selvy, L / Shahinyan, A / Sirca, S / Solvignon, P / Sperduto, M L / Subedi, R / Sulkosky, V / Sutera, C / Tobias, W A / Urciuoli, G M / Wang, D / Wojtsekhowski, B / Yao, H / Ye, Z / Zhan, X / Zhang, J / Zhao, B / Zhao, Z / Zheng, X / Zhu, P

Nature communications

2017 Volume 8, Issue 1, Page(s) 1408

Abstract: The internal structure of nucleons (protons and neutrons) remains one of the greatest outstanding problems in modern nuclear physics. By scattering high-energy electrons off a proton we are able to resolve its fundamental constituents and probe their ... ...

Abstract	The internal structure of nucleons (protons and neutrons) remains one of the greatest outstanding problems in modern nuclear physics. By scattering high-energy electrons off a proton we are able to resolve its fundamental constituents and probe their momenta and positions. Here we investigate the dynamics of quarks and gluons inside nucleons using deeply virtual Compton scattering (DVCS)-a highly virtual photon scatters off the proton, which subsequently radiates a photon. DVCS interferes with the Bethe-Heitler (BH) process, where the photon is emitted by the electron rather than the proton. We report herein the full determination of the BH-DVCS interference by exploiting the distinct energy dependences of the DVCS and BH amplitudes. In the regime where the scattering is expected to occur off a single quark, measurements show an intriguing sensitivity to gluons, the carriers of the strong interaction.
Language	English
Publishing date	2017-11-10
Publishing country	England
Document type	Journal Article ; Research Support, U.S. Gov't, Non-P.H.S. ; Research Support, Non-U.S. Gov't
ZDB-ID	2553671-0
ISSN	2041-1723 ; 2041-1723
ISSN (online)	2041-1723
ISSN	2041-1723
DOI	10.1038/s41467-017-01819-3
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Article ; Online: Rosenbluth Separation of the π^{0} Electroproduction Cross Section Off the Neutron.

Mazouz, M / Ahmed, Z / Albataineh, H / Allada, K / Aniol, K A / Bellini, V / Benali, M / Boeglin, W / Bertin, P / Brossard, M / Camsonne, A / Canan, M / Chandavar, S / Chen, C / Chen, J-P / Defurne, M / de Jager, C W / de Leo, R / Desnault, C /

Deur, A / El Fassi, L / Ent, R / Flay, D / Friend, M / Fuchey, E / Frullani, S / Garibaldi, F / Gaskell, D / Giusa, A / Glamazdin, O / Golge, S / Gomez, J / Hansen, O / Higinbotham, D / Holmstrom, T / Horn, T / Huang, J / Huang, M / Huber, G M / Hyde, C E / Iqbal, S / Itard, F / Kang, Ho / Kang, Hy / Kelleher, A / Keppel, C / Koirala, S / Korover, I / LeRose, J J / Lindgren, R / Long, E / Magne, M / Mammei, J / Margaziotis, D J / Markowitz, P / Martí Jiménez-Argüello, A / Meddi, F / Meekins, D / Michaels, R / Mihovilovic, M / Muangma, N / Muñoz Camacho, C / Nadel-Turonski, P / Nuruzzaman, N / Paremuzyan, R / Puckett, A / Punjabi, V / Qiang, Y / Rakhman, A / Rashad, M N H / Riordan, S / Roche, J / Russo, G / Sabatié, F / Saenboonruang, K / Saha, A / Sawatzky, B / Selvy, L / Shahinyan, A / Sirca, S / Solvignon, P / Sperduto, M L / Subedi, R / Sulkosky, V / Sutera, C / Tobias, W A / Urciuoli, G M / Wang, D / Wojtsekhowski, B / Yao, H / Ye, Z / Zana, L / Zhan, X / Zhang, J / Zhao, B / Zhao, Z / Zheng, X / Zhu, P

Physical review letters

2017 Volume 118, Issue 22, Page(s) 222002

Abstract: We report the first longitudinal-transverse separation of the deeply virtual exclusive π^{0} electroproduction cross section off the neutron and coherent deuteron. The corresponding four structure functions dσ_{L}/dt, dσ_{T}/dt, dσ_{LT}/dt, and dσ_{TT}/ ... ...

Abstract	We report the first longitudinal-transverse separation of the deeply virtual exclusive π^{0} electroproduction cross section off the neutron and coherent deuteron. The corresponding four structure functions dσ_{L}/dt, dσ_{T}/dt, dσ_{LT}/dt, and dσ_{TT}/dt are extracted as a function of the momentum transfer to the recoil system at Q^{2}=1.75 GeV^{2} and x_{B}=0.36. The ed→edπ^{0} cross sections are found compatible with the small values expected from theoretical models. The en→enπ^{0} cross sections show a dominance from the response to transversely polarized photons, and are in good agreement with calculations based on the transversity generalized parton distributions of the nucleon. By combining these results with previous measurements of π^{0} electroproduction off the proton, we present a flavor decomposition of the u and d quark contributions to the cross section.
Language	English
Publishing date	2017-06-02
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.118.222002
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Article ; Online: Rosenbluth Separation of the π^{0} Electroproduction Cross Section.

Defurne, M / Mazouz, M / Ahmed, Z / Albataineh, H / Allada, K / Aniol, K A / Bellini, V / Benali, M / Boeglin, W / Bertin, P / Brossard, M / Camsonne, A / Canan, M / Chandavar, S / Chen, C / Chen, J-P / de Jager, C W / de Leo, R / Desnault, C /

Deur, A / El Fassi, L / Ent, R / Flay, D / Friend, M / Fuchey, E / Frullani, S / Garibaldi, F / Gaskell, D / Giusa, A / Glamazdin, O / Golge, S / Gomez, J / Hansen, O / Higinbotham, D / Holmstrom, T / Horn, T / Huang, J / Huang, M / Huber, G M / Hyde, C E / Iqbal, S / Itard, F / Kang, Ho / Kang, Hy / Kelleher, A / Keppel, C / Koirala, S / Korover, I / LeRose, J J / Lindgren, R / Long, E / Magne, M / Mammei, J / Margaziotis, D J / Markowitz, P / Martí Jiménez-Argüello, A / Meddi, F / Meekins, D / Michaels, R / Mihovilovic, M / Muangma, N / Muñoz Camacho, C / Nadel-Turonski, P / Nuruzzaman, N / Paremuzyan, R / Puckett, A / Punjabi, V / Qiang, Y / Rakhman, A / Rashad, M N H / Riordan, S / Roche, J / Russo, G / Sabatié, F / Saenboonruang, K / Saha, A / Sawatzky, B / Selvy, L / Shahinyan, A / Sirca, S / Solvignon, P / Sperduto, M L / Subedi, R / Sulkosky, V / Sutera, C / Tobias, W A / Urciuoli, G M / Wang, D / Wojtsekhowski, B / Yao, H / Ye, Z / Zana, L / Zhan, X / Zhang, J / Zhao, B / Zhao, Z / Zheng, X / Zhu, P

Physical review letters

2016 Volume 117, Issue 26, Page(s) 262001

Abstract: We present deeply virtual π^{0} electroproduction cross-section measurements at x_{B}=0.36 and three different Q^{2} values ranging from 1.5 to 2 GeV^{2}, obtained from Jefferson Lab Hall A experiment E07-007. The Rosenbluth technique is used to ... ...

Abstract	We present deeply virtual π^{0} electroproduction cross-section measurements at x_{B}=0.36 and three different Q^{2} values ranging from 1.5 to 2 GeV^{2}, obtained from Jefferson Lab Hall A experiment E07-007. The Rosenbluth technique is used to separate the longitudinal and transverse responses. Results demonstrate that the cross section is dominated by its transverse component and, thus, is far from the asymptotic limit predicted by perturbative quantum chromodynamics. Nonetheless, an indication of a nonzero longitudinal contribution is provided by the measured interference term σ_{LT}. Results are compared with several models based on the leading-twist approach of generalized parton distributions (GPDs). In particular, a fair agreement is obtained with models in which the scattering amplitude includes convolution terms of chiral-odd (transversity) GPDs of the nucleon with the twist-3 pion distribution amplitude. This experiment, together with previous extensive unseparated measurements, provides strong support to the exciting idea that transversity GPDs can be accessed via neutral pion electroproduction in the high-Q^{2} regime.
Language	English
Publishing date	2016-12-23
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.117.262001
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Measurement of the Target-Normal Single-Spin Asymmetry in Quasielastic Scattering from the Reaction (3)He(↑)(e,e').

Zhang, Y-W / Long, E / Mihovilovič, M / Jin, G / Allada, K / Anderson, B / Annand, J R M / Averett, T / Ayerbe-Gayoso, C / Boeglin, W / Bradshaw, P / Camsonne, A / Canan, M / Cates, G D / Chen, C / Chen, J P / Chudakov, E / De Leo, R / Deng, X /

Deur, A / Dutta, C / El Fassi, L / Flay, D / Frullani, S / Garibaldi, F / Gao, H / Gilad, S / Gilman, R / Glamazdin, O / Golge, S / Gomez, J / Hansen, O / Higinbotham, D W / Holmstrom, T / Huang, J / Ibrahim, H / de Jager, C W / Jensen, E / Jiang, X / St John, J / Jones, M / Kang, H / Katich, J / Khanal, H P / King, P / Korsch, W / LeRose, J / Lindgren, R / Lu, H-J / Luo, W / Markowitz, P / Meziane, M / Michaels, R / Moffit, B / Monaghan, P / Muangma, N / Nanda, S / Norum, B E / Pan, K / Parno, D / Piasetzky, E / Posik, M / Punjabi, V / Puckett, A J R / Qian, X / Qiang, Y / Qiu, X / Riordan, S / Ron, G / Saha, A / Sawatzky, B / Schiavilla, R / Schoenrock, B / Shabestari, M / Shahinyan, A / Širca, S / Subedi, R / Sulkosky, V / Tobias, W A / Tireman, W / Urciuoli, G M / Wang, D / Wang, K / Wang, Y / Watson, J / Wojtsekhowski, B / Ye, Z / Zhan, X / Zhang, Y / Zheng, X / Zhao, B / Zhu, L

Physical review letters

2015 Volume 115, Issue 17, Page(s) 172502

Abstract: We report the first measurement of the target single-spin asymmetry, A(y), in quasielastic scattering from the inclusive reaction (3)He(↑)(e,e') on a (3)He gas target polarized normal to the lepton scattering plane. Assuming time-reversal invariance, ... ...

Abstract	We report the first measurement of the target single-spin asymmetry, A(y), in quasielastic scattering from the inclusive reaction (3)He(↑)(e,e') on a (3)He gas target polarized normal to the lepton scattering plane. Assuming time-reversal invariance, this asymmetry is strictly zero for one-photon exchange. A nonzero A(y) can arise from the interference between the one- and two-photon exchange processes which is sensitive to the details of the substructure of the nucleon. An experiment recently completed at Jefferson Lab yielded asymmetries with high statistical precision at Q(2)=0.13, 0.46, and 0.97 GeV(2). These measurements demonstrate, for the first time, that the (3)He asymmetry is clearly nonzero and negative at the 4σ-9σ level. Using measured proton-to-(3)He cross-section ratios and the effective polarization approximation, neutron asymmetries of -(1-3)% were obtained. The neutron asymmetry at high Q(2) is related to moments of the generalized parton distributions (GPDs). Our measured neutron asymmetry at Q(2)=0.97 GeV(2) agrees well with a prediction based on two-photon exchange using a GPD model and thus provides a new, independent constraint on these distributions.
Language	English
Publishing date	2015-10-23
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.115.172502
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Measurement of double-polarization asymmetries in the quasielastic (3)He[→](e[→],e(')d) process.

Mihovilovič, M / Jin, G / Long, E / Zhang, Y-W / Allada, K / Anderson, B / Annand, J R M / Averett, T / Boeglin, W / Bradshaw, P / Camsonne, A / Canan, M / Cates, G D / Chen, C / Chen, J P / Chudakov, E / De Leo, R / Deng, X / Deltuva, A /

Deur, A / Dutta, C / El Fassi, L / Flay, D / Frullani, S / Garibaldi, F / Gao, H / Gilad, S / Gilman, R / Glamazdin, O / Golak, J / Golge, S / Gomez, J / Hansen, O / Higinbotham, D W / Holmstrom, T / Huang, J / Ibrahim, H / de Jager, C W / Jensen, E / Jiang, X / Jones, M / Kang, H / Katich, J / Khanal, H P / Kievsky, A / King, P / Korsch, W / LeRose, J / Lindgren, R / Lu, H-J / Luo, W / Marcucci, L E / Markowitz, P / Meziane, M / Michaels, R / Moffit, B / Monaghan, P / Muangma, N / Nanda, S / Norum, B E / Pan, K / Parno, D / Piasetzky, E / Posik, M / Punjabi, V / Puckett, A J R / Qian, X / Qiang, Y / Qui, X / Riordan, S / Saha, A / Sauer, P U / Sawatzky, B / Schiavilla, R / Schoenrock, B / Shabestari, M / Shahinyan, A / Širca, S / Skibiński, R / John, J St / Subedi, R / Sulkosky, V / Tobias, W A / Tireman, W / Urciuoli, G M / Viviani, M / Wang, D / Wang, K / Wang, Y / Watson, J / Wojtsekhowski, B / Witała, H / Ye, Z / Zhan, X / Zhang, Y / Zheng, X / Zhao, B / Zhu, L

Physical review letters

2014 Volume 113, Issue 23, Page(s) 232505

Abstract: We present a precise measurement of double-polarization asymmetries in the ^{3}He[over →](e[over →],e^{'}d) reaction. This particular process is a uniquely sensitive probe of hadron dynamics in ^{3}He and the structure of the underlying electromagnetic ... ...

Abstract	We present a precise measurement of double-polarization asymmetries in the ^{3}He[over →](e[over →],e^{'}d) reaction. This particular process is a uniquely sensitive probe of hadron dynamics in ^{3}He and the structure of the underlying electromagnetic currents. The measurements have been performed in and around quasielastic kinematics at Q^{2}=0.25(GeV/c)^{2} for missing momenta up to 270 MeV/c. The asymmetries are in fair agreement with the state-of-the-art calculations in terms of their functional dependencies on p_{m} and ω, but are systematically offset. Beyond the region of the quasielastic peak, the discrepancies become even more pronounced. Thus, our measurements have been able to reveal deficiencies in the most sophisticated calculations of the three-body nuclear system, and indicate that further refinement in the treatment of their two-and/or three-body dynamics is required.
Language	English
Publishing date	2014-12-05
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.113.232505
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Precision measurement of the neutron twist-3 matrix element d(2)(n): probing color forces.

Posik, M / Flay, D / Parno, D S / Allada, K / Armstrong, W / Averett, T / Benmokhtar, F / Bertozzi, W / Camsonne, A / Canan, M / Cates, G D / Chen, C / Chen, J-P / Choi, S / Chudakov, E / Cusanno, F / Dalton, M M / Deconinck, W / de Jager, C W /

Deng, X / Deur, A / Dutta, C / El Fassi, L / Franklin, G B / Friend, M / Gao, H / Garibaldi, F / Gilad, S / Gilman, R / Glamazdin, O / Golge, S / Gomez, J / Guo, L / Hansen, O / Higinbotham, D W / Holmstrom, T / Huang, J / Hyde, C / Ibrahim, H F / Jiang, X / Jin, G / Katich, J / Kelleher, A / Kolarkar, A / Korsch, W / Kumbartzki, G / LeRose, J J / Lindgren, R / Liyanage, N / Long, E / Lukhanin, A / Mamyan, V / McNulty, D / Meziani, Z-E / Michaels, R / Mihovilovič, M / Moffit, B / Muangma, N / Nanda, S / Narayan, A / Nelyubin, V / Norum, B / Nuruzzaman / Oh, Y / Peng, J C / Qian, X / Qiang, Y / Rakhman, A / Riordan, S / Saha, A / Sawatzky, B / Shabestari, M H / Shahinyan, A / Širca, S / Solvignon, P / Subedi, R / Sulkosky, V / Tobias, W A / Troth, W / Wang, D / Wang, Y / Wojtsekhowski, B / Yan, X / Yao, H / Ye, Y / Ye, Z / Yuan, L / Zhan, X / Zhang, Y / Zhang, Y-W / Zhao, B / Zheng, X

Physical review letters

2014 Volume 113, Issue 2, Page(s) 22002

Abstract: Double-spin asymmetries and absolute cross sections were measured at large Bjorken x (0.25≤x≤0.90), in both the deep-inelastic and resonance regions, by scattering longitudinally polarized electrons at beam energies of 4.7 and 5.9 GeV from a ... ...

Abstract	Double-spin asymmetries and absolute cross sections were measured at large Bjorken x (0.25≤x≤0.90), in both the deep-inelastic and resonance regions, by scattering longitudinally polarized electrons at beam energies of 4.7 and 5.9 GeV from a transversely and longitudinally polarized (3)He target. In this dedicated experiment, the spin structure function g(2)((3)He) was determined with precision at large x, and the neutron twist-3 matrix element d(2)(n) was measured at ⟨Q(2)⟩ of 3.21 and 4.32 GeV(2)/c(2), with an absolute precision of about 10(-5). Our results are found to be in agreement with lattice QCD calculations and resolve the disagreement found with previous data at ⟨Q(2)⟩=5 GeV(2)/c(2). Combining d(2)(n) and a newly extracted twist-4 matrix element f(2)(n), the average neutron color electric and magnetic forces were extracted and found to be of opposite sign and about 30 MeV/fm in magnitude.
Language	English
Publishing date	2014-07-11
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.113.022002
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Book ; Online: Rosenbluth separation of the $\pi^0$ electroproduction cross section

Defurne, M. / Mazouz, M. / Albataineh, H. / Allada, K. / Aniol, K. A. / Bellini, V. / Benali, M. / Boeglin, W. / Bertin, P. / Brossard, M. / Camsonne, A. / Canan, M. / Chandavar, S. / Chen, C. / Chen, J. -P. / de Jager, C. W. / de Leo, R. / Desnault, C. / Deur, A. /

Fassi, L. El / Ent, R. / Flay, D. / Friend, M. / Fuchey, E. / Frullani, S. / Garibaldi, F. / Gaskell, D. / Giusa, A. / Glamazdin, O. / Golge, S. / Gomez, J. / Hansen, O. / Higinbotham, D. / Holmstrom, T. / Horn, T. / Huang, J. / Huang, M. / Hyde, C. E. / Iqbal, S. / Itard, F. / Kang, H. / Kelleher, A. / Keppel, C. / Koirala, S. / Korover, I. / LeRose, J. J. / Lindgren, R. / Long, E. / Magne, M. / Mammei, J. / Margaziotis, D. J. / Markowitz, P. / Jimenez-Arguello, A. Marti / Meddi, F. / Meekins, D. / Michaels, R. / Mihovilovic, M. / Camacho, C. Munoz / Nadel-Turonski, P. / Nuruzzaman, N. / Paremuzyan, R. / Puckett, A. / Punjabi, V. / Qiang, Y. / Rakhman, A. / Rashad, M. N. H. / Riordan, S. / Roche, J. / Russo, G. / Sabati, F. / Saenboonruang, K. / Saha, A. / Sawatzky, B. / Selvy, L. / Shahinyan, A. / Sirca, S. / Solvignon, P. / Sperduto, M. L. / Subedi, R. / Sulkosky, V. / Sutera, C. / Tobias, W. A. / Urciuoli, G. M. / Wang, D. / Wojtsekhowski, B. / Yao, H. / Ye, Z. / Zafar, A. / Zhan, X. / Zhang, J. / Zhao, B. / Zhao, Z. / Zheng, X. / Zhu, P.

2016

Abstract: We present deeply virtual $\pi^0$ electroproduction cross-section measurements at $x_B$=0.36 and three different $Q^2$--values ranging from 1.5 to 2 GeV$^2$, obtained from experiment E07-007 that ran in the Hall A at Jefferson Lab. The Rosenbluth ... ...

Abstract	We present deeply virtual $\pi^0$ electroproduction cross-section measurements at $x_B$=0.36 and three different $Q^2$--values ranging from 1.5 to 2 GeV$^2$, obtained from experiment E07-007 that ran in the Hall A at Jefferson Lab. The Rosenbluth technique was used to separate the longitudinal and transverse responses. Results demonstrate that the cross section is dominated by its transverse component, and thus is far from the asymptotic limit predicted by perturbative Quantum Chromodynamics. An indication of a non-zero longitudinal contribution is provided by the interference term $\sigma_{LT}$ also measured. Results are compared with several models based on the leading twist approach of Generalized Parton Distributions (GPDs). In particular, a fair agreement is obtained with models where the scattering amplitude is described by a convolution of chiral-odd (transversity) GPDs of the nucleon with the twist-3 pion distribution amplitude. Therefore, neutral pion electroproduction may offer the exciting possibility of accessing transversity GPDs through experiment. Comment: Submitted to Physical Review Letters
Keywords	High Energy Physics - Experiment ; Nuclear Experiment
Subject code	621
Publishing date	2016-08-02
Publishing country	us
Document type	Book ; Online
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Article ; Online: Measurements of parity-violating asymmetries in electron-deuteron scattering in the nucleon resonance region.

Wang, D / Pan, K / Subedi, R / Deng, X / Ahmed, Z / Allada, K / Aniol, K A / Armstrong, D S / Arrington, J / Bellini, V / Beminiwattha, R / Benesch, J / Benmokhtar, F / Camsonne, A / Canan, M / Cates, G D / Chen, J-P / Chudakov, E / Cisbani, E /

Dalton, M M / de Jager, C W / De Leo, R / Deconinck, W / Deur, A / Dutta, C / El Fassi, L / Flay, D / Franklin, G B / Friend, M / Frullani, S / Garibaldi, F / Giusa, A / Glamazdin, A / Golge, S / Grimm, K / Hafidi, K / Hansen, O / Higinbotham, D W / Holmes, R / Holmstrom, T / Holt, R J / Huang, J / Hyde, C E / Jen, C M / Jones, D / Kang, H / King, P / Kowalski, S / Kumar, K S / Lee, J H / LeRose, J J / Liyanage, N / Long, E / McNulty, D / Margaziotis, D J / Meddi, F / Meekins, D G / Mercado, L / Meziani, Z-E / Michaels, R / Mihovilovic, M / Muangma, N / Myers, K E / Nanda, S / Narayan, A / Nelyubin, V / Nuruzzaman / Oh, Y / Parno, D / Paschke, K D / Phillips, S K / Qian, X / Qiang, Y / Quinn, B / Rakhman, A / Reimer, P E / Rider, K / Riordan, S / Roche, J / Rubin, J / Russo, G / Saenboonruang, K / Saha, A / Sawatzky, B / Shahinyan, A / Silwal, R / Sirca, S / Souder, P A / Suleiman, R / Sulkosky, V / Sutera, C M / Tobias, W A / Urciuoli, G M / Waidyawansa, B / Wojtsekhowski, B / Ye, L / Zhao, B / Zheng, X

Physical review letters

2013 Volume 111, Issue 8, Page(s) 82501

Abstract: We report on parity-violating asymmetries in the nucleon resonance region measured using inclusive inelastic scattering of 5-6 GeV longitudinally polarized electrons off an unpolarized deuterium target. These results are the first parity-violating ... ...

Abstract	We report on parity-violating asymmetries in the nucleon resonance region measured using inclusive inelastic scattering of 5-6 GeV longitudinally polarized electrons off an unpolarized deuterium target. These results are the first parity-violating asymmetry data in the resonance region beyond the Δ(1232). They provide a verification of quark-hadron duality-the equivalence of the quark- and hadron-based pictures of the nucleon-at the (10-15)% level in this electroweak observable, which is dominated by contributions from the nucleon electroweak γZ interference structure functions. In addition, the results provide constraints on nucleon resonance models relevant for calculating background corrections to elastic parity-violating electron scattering measurements.
Language	English
Publishing date	2013-08-23
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.111.082501
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Article ; Online: New precision limit on the strange vector form factors of the proton.

Ahmed, Z / Allada, K / Aniol, K A / Armstrong, D S / Arrington, J / Baturin, P / Bellini, V / Benesch, J / Beminiwattha, R / Benmokhtar, F / Canan, M / Camsonne, A / Cates, G D / Chen, J-P / Chudakov, E / Cisbani, E / Dalton, M M / de Jager, C W / De Leo, R /

Deconinck, W / Decowski, P / Deng, X / Deur, A / Dutta, C / Franklin, G B / Friend, M / Frullani, S / Garibaldi, F / Giusa, A / Glamazdin, A / Golge, S / Grimm, K / Hansen, O / Higinbotham, D W / Holmes, R / Holmstrom, T / Huang, J / Huang, M / Hyde, C E / Jen, C M / Jin, G / Jones, D / Kang, H / King, P / Kowalski, S / Kumar, K S / Lee, J H / LeRose, J J / Liyanage, N / Long, E / McNulty, D / Margaziotis, D / Meddi, F / Meekins, D G / Mercado, L / Meziani, Z-E / Michaels, R / Muñoz-Camacho, C / Mihovilovic, M / Muangma, N / Myers, K E / Nanda, S / Narayan, A / Nelyubin, V / Nuruzzaman / Oh, Y / Pan, K / Parno, D / Paschke, K D / Phillips, S K / Qian, X / Qiang, Y / Quinn, B / Rakhman, A / Reimer, P E / Rider, K / Riordan, S / Roche, J / Rubin, J / Russo, G / Saenboonruang, K / Saha, A / Sawatzky, B / Silwal, R / Sirca, S / Souder, P A / Sperduto, M / Subedi, R / Suleiman, R / Sulkosky, V / Sutera, C M / Tobias, W A / Urciuoli, G M / Waidyawansa, B / Wang, D / Wexler, J / Wilson, R / Wojtsekhowski, B / Zhan, X / Yan, X / Yao, H / Ye, L / Zhao, B / Zheng, X

Physical review letters

2012 Volume 108, Issue 10, Page(s) 102001

Abstract: The parity-violating cross-section asymmetry in the elastic scattering of polarized electrons from unpolarized protons has been measured at a four-momentum transfer squared Q2 = 0.624 GeV2 and beam energy E(b) = 3.48 GeV to be A(PV) = -23.80 ± 0.78( ... ...

Abstract	The parity-violating cross-section asymmetry in the elastic scattering of polarized electrons from unpolarized protons has been measured at a four-momentum transfer squared Q2 = 0.624 GeV2 and beam energy E(b) = 3.48 GeV to be A(PV) = -23.80 ± 0.78(stat) ± 0.36(syst) parts per million. This result is consistent with zero contribution of strange quarks to the combination of electric and magnetic form factors G(E)(s) + 0.517G(M)(s) = 0.003 ± 0.010(stat) ± 0.004(syst) ± 0.009(ff), where the third error is due to the limits of precision on the electromagnetic form factors and radiative corrections. With this measurement, the world data on strange contributions to nucleon form factors are seen to be consistent with zero and not more than a few percent of the proton form factors.
Language	English
Publishing date	2012-03-09
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.108.102001
Database	MEDical Literature Analysis and Retrieval System OnLINE

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