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132 results on '"B, Wojtsekhowski"'

1. Measurement of double-polarization asymmetries in the quasi-elastic He→3(e→,e′p) process

Author

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

Subjects
Physics, QC1-999
Abstract

We report on a precise measurement of double-polarization asymmetries in electron-induced breakup of He3 proceeding to pd and ppn final states, performed in quasi-elastic kinematics at Q2=0.25(GeV/c)2 for missing momenta up to 250MeV/c. These observables represent highly sensitive tools to investigate the electromagnetic and spin structure of He3 and the relative importance of two- and three-body effects involved in the breakup reaction dynamics. The measured asymmetries cannot be satisfactorily reproduced by state-of-the-art calculations of He3 unless their three-body segment is adjusted, indicating that the spin-dependent part of the nuclear interaction governing the three-body breakup process is much smaller than previously thought. Keywords: Double-polarization asymmetry, Helium-3 nucleus, Proton knock-out

Published
2019
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2. Measurement of the 3He spin-structure functions and of neutron (3He) spin-dependent sum rules at 0.035 ≤ Q2 ≤ 0.24 GeV2

Author

V. Sulkosky, J.T. Singh, C. Peng, J.-P. Chen, A. Deur, S. Abrahamyan, K.A. Aniol, D.S. Armstrong, T. Averett, S.L. Bailey, A. Beck, P. Bertin, F. Butaru, W. Boeglin, A. Camsonne, G.D. Cates, C.C. Chang, Seonho Choi, E. Chudakov, L. Coman, J.C. Cornejo, B. Craver, F. Cusanno, R. De Leo, C.W. de Jager, J.D. Denton, S. Dhamija, R. Feuerbach, J.M. Finn, S. Frullani, K. Fuoti, H. Gao, F. Garibaldi, O. Gayou, R. Gilman, A. Glamazdin, C. Glashausser, J. Gomez, J.-O. Hansen, D. Hayes, B. Hersman, D.W. Higinbotham, T. Holmstrom, T.B. Humensky, C.E. Hyde, H. Ibrahim, M. Iodice, X. Jiang, L.J. Kaufman, A. Kelleher, K.E. Keister, W. Kim, A. Kolarkar, N. Kolb, W. Korsch, K. Kramer, G. Kumbartzki, L. Lagamba, V. Lainé, G. Laveissiere, J.J. Lerose, D. Lhuillier, R. Lindgren, N. Liyanage, H.-J. Lu, B. Ma, D.J. Margaziotis, P. Markowitz, K. McCormick, M. Meziane, Z.-E. Meziani, R. Michaels, B. Moffit, P. Monaghan, S. Nanda, J. Niedziela, M. Niskin, R. Pandolfi, K.D. Paschke, M. Potokar, A.J.R. Puckett, V.A. Punjabi, Y. Qiang, R. Ransome, B. Reitz, R. Roché, A. Saha, A. Shabetai, S. Širca, K. Slifer, R. Snyder, P. Solvignon, R. Stringer, R. Subedi, W.A. Tobias, N. Ton, P.E. Ulmer, G.M. Urciuoli, A. Vacheret, E. Voutier, K. Wang, L. Wan, B. Wojtsekhowski, S. Woo, H. Yao, J. Yuan, X. Zhan, X. Zheng, and L. Zhu

Subjects
Physics, QC1-999
Abstract

The spin-structure functions g1 and g2, and the spin-dependent partial cross-section σTT have been extracted from the polarized cross-sections differences, Δσ∥(ν,Q2) and Δσ⊥(ν,Q2) measured for the He3→(e→,e′)X reaction, in the E97-110 experiment at Jefferson Lab. Polarized electrons with energies from 1.147 to 4.404 GeV were scattered at angles of 6∘ and 9∘ from a longitudinally or transversely polarized 3He target. The data cover the kinematic regions of the quasi-elastic, resonance production and beyond. From the extracted spin-structure functions, the first moments Γ1‾(Q2), Γ2(Q2) and ITT(Q2) are evaluated with high precision for the neutron in the Q2 range from 0.035 to 0.24GeV2. The comparison of the data and the chiral effective field theory predictions reveals the importance of proper treatment of the Δ degree of freedom for spin observables.

Published
2020
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3. A glimpse of gluons through deeply virtual compton scattering on the proton

Author

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

Subjects
Science
Abstract

It remains a challenge to find the structure and the distribution of the constituents of nucleons. Here the authors use a scattering method to get information about the gluons and quarks inside a proton and separate the contribution of Bethe-Heitler from the deeply virtual Compton scattering process.

Published
2017
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4. Measurement of the single-spin asymmetry Ay0 in quasi-elastic 3He↑(e,e′n) scattering at 0.4

Author

E. Long, Y.W. Zhang, M. Mihovilovič, G. Jin, V. Sulkosky, A. Kelleher, B. Anderson, D.W. Higinbotham, S. Širca, K. Allada, J.R.M. Annand, T. Averett, W. Bertozzi, W. Boeglin, P. Bradshaw, A. Camsonne, M. Canan, G.D. Cates, C. Chen, J.-P. Chen, E. Chudakov, R. De Leo, X. Deng, A. Deur, C. Dutta, L. El Fassi, D. Flay, S. Frullani, F. Garibaldi, H. Gao, S. Gilad, R. Gilman, O. Glamazdin, S. Golge, J. Gomez, J.-O. Hansen, T. Holmstrom, J. Huang, H. Ibrahim, C.W. de Jager, E. Jensen, X. Jiang, M. Jones, H. Kang, J. Katich, H.P. Khanal, P.M. King, W. Korsch, J. LeRose, R. Lindgren, H.-J. Lu, W. Luo, P. Markowitz, M. Meziane, R. Michaels, B. Moffit, P. Monaghan, N. Muangma, S. Nanda, B.E. Norum, K. Pan, D. Parno, E. Piasetzky, M. Posik, V. Punjabi, A.J.R. Puckett, X. Qian, Y. Qiang, X. Qui, S. Riordan, A. Saha, B. Sawatzky, M. Shabestari, A. Shahinyan, B. Shoenrock, J. St. John, R. Subedi, W.A. Tobias, W. Tireman, G.M. Urciuoli, D. Wang, K. Wang, Y. Wang, J. Watson, B. Wojtsekhowski, Z. Ye, X. Zhan, Y. Zhang, X. Zheng, B. Zhao, and L. Zhu

Subjects
Physics, QC1-999
Abstract

Due to the lack of free neutron targets, studies of the structure of the neutron are typically made by scattering electrons from either 2H or 3He targets. In order to extract useful neutron information from a 3He target, one must understand how the neutron in a 3He system differs from a free neutron by taking into account nuclear effects such as final state interactions and meson exchange currents. The target single spin asymmetry Ay0 is an ideal probe of such effects, as any deviation from zero indicates effects beyond plane wave impulse approximation. New measurements of the target single spin asymmetry Ay0 at Q2 of 0.46 and 0.96 (GeV/c)2 were made at Jefferson Lab using the quasi-elastic He↑3(e,e′n) reaction. Our measured asymmetry decreases rapidly, from >20% at Q2=0.46 (GeV/c)2 to nearly zero at Q2=0.96 (GeV/c)2, demonstrating the fall-off of the reaction mechanism effects as Q2 increases. We also observed a small ϵ-dependent increase in Ay0 compared to previous measurements, particularly at moderate Q2. This indicates that upcoming high Q2 measurements from the Jefferson Lab 12 GeV program can cleanly probe neutron structure from polarized 3He using plane wave impulse approximation. Keywords: Neutron, Quasi-elastic, Polarized, 3He, Electron scattering, Single spin asymmetry

Published
2019
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5. Comparing proton momentum distributions in A = 2 and 3 nuclei via 2H 3H and 3He (e,e′p) measurements

Author

R. Cruz-Torres, S. Li, F. Hauenstein, A. Schmidt, D. Nguyen, D. Abrams, H. Albataineh, S. Alsalmi, D. Androic, K. Aniol, W. Armstrong, J. Arrington, H. Atac, T. Averett, C. Ayerbe Gayoso, X. Bai, J. Bane, S. Barcus, A. Beck, V. Bellini, H. Bhatt, D. Bhetuwal, D. Biswas, D. Blyth, W. Boeglin, D. Bulumulla, A. Camsonne, J. Castellanos, J.-P. Chen, E.O. Cohen, S. Covrig, K. Craycraft, B. Dongwi, M. Duer, B. Duran, D. Dutta, E. Fuchey, C. Gal, T.N. Gautam, S. Gilad, K. Gnanvo, T. Gogami, J. Gomez, C. Gu, A. Habarakada, T. Hague, O. Hansen, M. Hattawy, O. Hen, D.W. Higinbotham, E. Hughes, C. Hyde, H. Ibrahim, S. Jian, S. Joosten, A. Karki, B. Karki, A.T. Katramatou, C. Keppel, M. Khachatryan, V. Khachatryan, A. Khanal, D. King, P. King, I. Korover, T. Kutz, N. Lashley-Colthirst, G. Laskaris, W. Li, H. Liu, N. Liyanage, D. Lonardoni, R. Machleidt, L.E. Marcucci, P. Markowitz, R.E. McClellan, D. Meekins, S. Mey-Tal Beck, Z.-E. Meziani, R. Michaels, M. Mihovilovič, V. Nelyubin, N. Nuruzzaman, M. Nycz, R. Obrecht, M. Olson, L. Ou, V. Owen, B. Pandey, V. Pandey, A. Papadopoulou, S. Park, M. Patsyuk, S. Paul, G.G. Petratos, E. Piasetzky, R. Pomatsalyuk, S. Premathilake, A.J.R. Puckett, V. Punjabi, R. Ransome, M.N.H. Rashad, P.E. Reimer, S. Riordan, J. Roche, F. Sammarruca, N. Santiesteban, B. Sawatzky, E.P. Segarra, B. Schmookler, A. Shahinyan, S. Širca, N. Sparveris, T. Su, R. Suleiman, H. Szumila-Vance, A.S. Tadepalli, L. Tang, W. Tireman, F. Tortorici, G. Urciuoli, M. Viviani, L.B. Weinstein, B. Wojtsekhowski, S. Wood, Z.H. Ye, Z.Y. Ye, and J. Zhang

Subjects
Physics, QC1-999
Abstract

We report the first measurement of the (e,e′p) reaction cross-section ratios for Helium-3 (He3), Tritium (H3), and Deuterium (d). The measurement covered a missing momentum range of 40≤pmiss≤550MeV/c, at large momentum transfer (〈Q2〉≈1.9 (GeV/c)2) and xB>1, which minimized contributions from non quasi-elastic (QE) reaction mechanisms. The data is compared with plane-wave impulse approximation (PWIA) calculations using realistic spectral functions and momentum distributions. The measured and PWIA-calculated cross-section ratios for He3/d and H3/d extend to just above the typical nucleon Fermi-momentum (kF≈250 MeV/c) and differ from each other by ∼20%, while for He3/H3 they agree within the measurement accuracy of about 3%. At momenta above kF, the measured He3/H3 ratios differ from the calculation by 20%−50%. Final state interaction (FSI) calculations using the generalized Eikonal Approximation indicate that FSI should change the He3/H3 cross-section ratio for this measurement by less than 5%. If these calculations are correct, then the differences at large missing momenta between the He3/H3 experimental and calculated ratios could be due to the underlying NN interaction, and thus could provide new constraints on the previously loosely-constrained short-distance parts of the NN interaction.

Published
2019
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6. Electroexcitation of the Δ+(1232) at low momentum transfer

Author

A. Blomberg, D. Anez, N. Sparveris, A.J. Sarty, M. Paolone, S. Gilad, D. Higinbotham, Z. Ahmed, H. Albataineh, K. Allada, B. Anderson, K. Aniol, J. Annand, J. Arrington, T. Averett, H. Baghdasaryan, X. Bai, A. Beck, S. Beck, V. Bellini, F. Benmokhtar, W. Boeglin, C.M. Camacho, A. Camsonne, C. Chen, J.P. Chen, K. Chirapatpimol, E. Cisbani, M. Dalton, W. Deconinck, M. Defurne, R. De Leo, D. Flay, N. Fomin, M. Friend, S. Frullani, E. Fuchey, F. Garibaldi, R. Gilman, C. Gu, D. Hamilton, C. Hanretty, O. Hansen, M. Hashemi Shabestari, O. Hen, T. Holmstrom, M. Huang, S. Iqbal, N. Kalantarians, H. Kang, A. Kelleher, M. Khandaker, I. Korover, J. Leckey, J. LeRose, R. Lindgren, E. Long, J. Mammei, D.J. Margaziotis, A. Martí Jimenez-Arguello, D. Meekins, Z.E. Meziani, M. Mihovilovic, N. Muangma, B. Norum, Nuruzzaman, K. Pan, S. Phillips, E. Piasetzky, A. Polychronopoulou, I. Pomerantz, M. Posik, V. Punjabi, X. Qian, A. Rakhman, P.E. Reimer, S. Riordan, G. Ron, A. Saha, E. Schulte, L. Selvy, R. Shneor, S. Sirca, J. Sjoegren, R. Subedi, V. Sulkosky, W. Tireman, D. Wang, J. Watson, B. Wojtsekhowski, W. Yan, I. Yaron, Z. Ye, X. Zhan, J. Zhang, Y. Zhang, B. Zhao, Z. Zhao, X. Zheng, and P. Zhu

Subjects
CMR, Pion electroproduction, Nucleon deformation, Physics, QC1-999
Abstract

We report on new p(e,e′p)π∘ measurements at the Δ+(1232) resonance at the low momentum transfer region, where the mesonic cloud dynamics is predicted to be dominant and rapidly changing, offering a test bed for chiral effective field theory calculations. The new data explore the Q2 dependence of the resonant quadrupole amplitudes and for the first time indicate that the Electric and the Coulomb quadrupole amplitudes converge as Q2→0. The measurements of the Coulomb quadrupole amplitude have been extended to the lowest momentum transfer ever reached, and suggest that more than half of its magnitude is attributed to the mesonic cloud in this region. The new data disagree with predictions of constituent quark models and are in reasonable agreement with dynamical calculations that include pion cloud effects, chiral effective field theory and lattice calculations. The measurements indicate that improvement is required to the theoretical calculations and provide valuable input that will allow their refinements.

Published
2016
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7. The Present and Future of QCD: QCD Town Meeting White Paper -- An INput to the 2023 NSAC Long Range Plan

Author

P Achenbach, D Adhikari, A Afanasev, F Afzal, C Aidala, A Al-bataineh, D Almaaloi, M Amaryan, D Androic, W Armstrong, M Arriatia, J Arrington, A Asaturyan, E Aschenauer, H Atac, H Avakian, T Averett, C Ayerbe Gayoso, X Bai, K Barish, N Barnea, G Basar, M Battaglieri, A Baty, I Bautista, A Bazilevsky, C Beattie, S Behera, V Bellini, R Bellwied, J Benesch, F Benmokhtar, C Bernardes, J Bernauer, H Bhatt, S Bhatta, M Boer, T Boettcher, S Bogacz, H Bossi, J Brandenburg, E Brash, R Briceno, W Briscoe, S Brodsky, D Brown, V Burkert, H Caines, I Cali, A Camsonne, D Carman, J Caylor, S Cerci, M Chamizo Llatas, J Chen, Y Chen, Y Chien, P Chou, X Chu, E Chudakov, E Cline, I Cloet, P Cole, M Conners, M Constantinou, W Cosyn, S Covrig Dusa, R Cruz-Torres, U D'Alesio, C da Silva, Z Davoudi, C Dean, D Dean, M Demarteau, A Deshpande, W Detmold, A Deur, B Devkota, S Dhital, M Diefenthaler, S Dobbs, M Doring, X Dong, R Dotel, K Dow, E Downie, J Drachenberg, A Dumitru, J Dunlop, R Dupre, J Durham, D Dutta, R Edwards, R Ehlers, L El Fassi, M Elaasar, L Elouadrhiri, M Engelhardt, R Ent, S Esumi, O Evdokimov, O Eyser, C Fanelli, R Fatemi, I Fernando, F Flor, N Fomin, A Frawley, T Federico, R Fries, C Gal, B Gamage, L Gamberg, H Gao, D Gaskell, F Geurts, Y Ghandilyan, R Gilman, C Gleason, K Gnanvo, R Gothe, S Greene, H Griesshammer, S Grossberndt, B Grube, D Hackett, T Hague, H Hakobyan, J Hansen, Y Hatta, M Hattawy, L Havener, O Hen, W Henry, D Higinbotham, T Hobbs, A Hodges, T Holmstrom, B Hong, T Horn, C Howell, H Huang, M Huang, S Huang, G Huber, C Hyde, E Isupov, P Jacobs, J Jalilian-Marian, A Jentsch, H Jheng, C Ji, X Ji, J Jia, D Jones, M Jones, N Kalantarians, G Kalicy, Z Kang, J Karthein, D Keller, C Keppel, V Khachartryan, D Kharzeev, M Kim, Y Kim, P King, E Kinney, S Klein, H Ko, V Koch, M Kohl, Y Kovchegov, G Krintiras, V Kubarovsky, S Kuhn, K Kumar, T Kutz, J Lajoie, J Lauret, I Lavrukhin, D Lawrence, J Lee, K Lee, S Lee, Y Lee, S Li, W Li, X Li, J Liao, H Lin, M Lisa, K Liu, M Liu, T Liu, S Liuti, N Liyanage, W Llope, C Loizides, R Longo, W Lorenzon, X Luo, R Ma, B McKinnon, D Meekins, Y Mehtar-Tani, W Melnitchouk, A Metz, C Meyer, Z Meziani, R Michaels, R Milner, H Mkrtchyan, P Mohanmurthy, B Mohanty, V Mokeev, I Mooney, C Morningstar, D Morrison, B Muller, S Mukherjee, J Mulligan, C Munoz Camacho, J Murillo Quijada, M Murray, S Nadeeshani, P Nadel-Turonski, J Nam, C Nattrass, G Nijs, J Norohna, J Noronha-Hostler, N Novitzky, M Nycz, F Olness, J Osborn, R Pak, B Pandey, M Paolone, Z Papandreou, J Paquet, S Park, K Paschke, B Pasquini, E Pasyuk, T Patel, A Patton, C Paudel, C Peng, J Peng, H Pereira Da Costa, D Perepelitsa, M Peters, P Petreczky, R Pisarski, D Pitonyak, M Ploskon, M Posik, J Poudel, R Pradhan, A Prokudin, C Pruneau, J Putschke, J Pybus, J Qiu, K Rajagopal, C Ratti, K Read, R Reed, D Richards, C Riedl, F Ringer, T Rinn, J Rittenhouse West, J Roche, A Rodas, G Roland, F Romero-Lopez, P Rossi, T Rostomyan, L Ruan, O Ruimi, N Saha, N Sahoo, T Sakaguchi, F Salazar, C Salgado, G Salme, S Salur, S Santiesteban, M Sargsian, M Sarsour, N Sato, T Satogata, S Sawada, T Schafer, B Scheihing-Hitschfeld, B Schenke, S Schindler, A Schmidt, R Seidl, M Sabestari, P Shanahan, C Shen, T Sheng, M Shepherd, A M Sickles, M Sievert, K Smith, Y Song, A Sorensen, P Souder, N Spareveris, S Srednyak, A Stahl Leiton, A Stasto, P Steinberg, S Stepanyan, M Stephanov, J Stevens, D Stewart, I Stewart, M Stojanovic, I Strakovsky, S Strauch, M Strickland, D Sunar Cerci, M Suresh, B Surrow, S Syritsyn, A Szczepaniak, A Tadepalli, A H Tang, J Tapia Takaki, T Tarnowsky, A Tawfik, M Taylor, C Tennant, A Thiel, D Thomas, Y Tian, A Timmins, P Tribedy, Z Tu, S Tuo, T Ullrich, E Umaka, N Ghimire, J Vary, J Velkovska, R Venugopalan, A Vijayakumar, I Vitev, W Vogelsang, R Vogt, A Vossen, E Voutier, V Vovchenko, A Walker-Loud, F Wang, J Wang, X Wang, L Weinstein, T Wenaus, S Weyhmiller, S Wissink, B Wojtsekhowski, C Wong, M Wood, Y Wunderlich, B Wyslouch, B Xiao, W Xie, W Xiong, N Xu, Q Xu, Z Xu, D Yaari, X Yao, Z Ye, C Yero, F Yuan, W Zajc, C Zhang, J Zhang, F Zhao, Y Zhao, Z Zhao, X Zheng, and J Zhou

Published
2023
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8. Precision measurements of A1n in the deep inelastic regime

Author

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

Subjects
Physics, QC1-999
Abstract

We have performed precision measurements of the double-spin virtual-photon asymmetry A1 on the neutron in the deep inelastic scattering regime, using an open-geometry, large-acceptance spectrometer and a longitudinally and transversely polarized 3He target. Our data cover a wide kinematic range 0.277≤x≤0.548 at an average Q2 value of 3.078 (GeV/c)2, doubling the available high-precision neutron data in this x range. We have combined our results with world data on proton targets to make a leading-order extraction of the ratio of polarized-to-unpolarized parton distribution functions for up quarks and for down quarks in the same kinematic range. Our data are consistent with a previous observation of an A1n zero crossing near x=0.5. We find no evidence of a transition to a positive slope in (Δd+Δd¯)/(d+d¯) up to x=0.548. Keywords: Spin structure functions, Nucleon structure, Parton distribution functions, Polarized electron scattering

Published
2015
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9. Concept of Very-Asymmetric Lepton Collider for Dark Matter Search

Author

V.S. Morozov and B. Wojtsekhowski

Subjects
Accelerator Physics (physics.acc-ph), Nuclear and High Energy Physics, Physics::Accelerator Physics, FOS: Physical sciences, High Energy Physics::Experiment, Physics - Accelerator Physics, Instrumentation
Abstract

Accelerator-based searches for dark matter are aiming for high sensitivity and need an experimental setup with high luminosity. This field of research is often called intensity frontier physics. One of the best motivated portals of interaction between dark matter and ordinary matter is a dark photon which could be observed as a resonance in the invariant mass of the decay products. Electron-positron collisions are known to be the cleanest interaction for such a study. In this paper we propose a scheme for a collider which allows for a luminosity of a few orders of magnitude higher than could be obtained in a conventional symmetric collider and with a few times higher accessible mass than is possible using a positron beam and a fixed target approach. The key concept is based on asymmetric energies: a high-energy circulating positron beam and a low-energy high-intensity electron beam, and optimization of the beam interaction region. We present here a configuration of a collision region of 10 MeV electron and 4 GeV positron beams., 13 pages, 13 figures

Published
2022

10. Measurement of the Nucleon F_{2}^{n}/F_{2}^{p} Structure Function Ratio by the Jefferson Lab MARATHON Tritium/Helium-3 Deep Inelastic Scattering Experiment

Author

D, Abrams, H, Albataineh, B S, Aljawrneh, S, Alsalmi, D, Androic, K, Aniol, W, Armstrong, J, Arrington, H, Atac, T, Averett, C Ayerbe, Gayoso, X, Bai, J, Bane, S, Barcus, A, Beck, V, Bellini, H, Bhatt, D, Bhetuwal, D, Biswas, D, Blyth, W, Boeglin, D, Bulumulla, J, Butler, A, Camsonne, M, Carmignotto, J, Castellanos, J-P, Chen, E O, Cohen, S, Covrig, K, Craycraft, R, Cruz-Torres, B, Dongwi, B, Duran, D, Dutta, E, Fuchey, C, Gal, T N, Gautam, S, Gilad, K, Gnanvo, T, Gogami, J, Gomez, C, Gu, A, Habarakada, T, Hague, J-O, Hansen, M, Hattawy, F, Hauenstein, D W, Higinbotham, R J, Holt, E W, Hughes, C, Hyde, H, Ibrahim, S, Jian, S, Joosten, A, Karki, B, Karki, A T, Katramatou, C, Keith, C, Keppel, M, Khachatryan, V, Khachatryan, A, Khanal, A, Kievsky, D, King, P M, King, I, Korover, S A, Kulagin, K S, Kumar, T, Kutz, N, Lashley-Colthirst, S, Li, W, Li, H, Liu, S, Liuti, N, Liyanage, P, Markowitz, R E, McClellan, D, Meekins, S Mey-Tal, Beck, Z-E, Meziani, R, Michaels, M, Mihovilovic, V, Nelyubin, D, Nguyen, Nuruzzaman, M, Nycz, R, Obrecht, M, Olson, V F, Owen, E, Pace, B, Pandey, V, Pandey, M, Paolone, A, Papadopoulou, S, Park, S, Paul, G G, Petratos, R, Petti, E, Piasetzky, R, Pomatsalyuk, S, Premathilake, A J R, Puckett, V, Punjabi, R D, Ransome, M N H, Rashad, P E, Reimer, S, Riordan, J, Roche, G, Salmè, N, Santiesteban, B, Sawatzky, S, Scopetta, A, Schmidt, B, Schmookler, J, Segal, E P, Segarra, A, Shahinyan, S, Širca, N, Sparveris, T, Su, R, Suleiman, H, Szumila-Vance, A S, Tadepalli, L, Tang, W, Tireman, F, Tortorici, G M, Urciuoli, B, Wojtsekhowski, S, Wood, Z H, Ye, Z Y, Ye, and J, Zhang

Abstract

The ratio of the nucleon F_{2} structure functions, F_{2}^{n}/F_{2}^{p}, is determined by the MARATHON experiment from measurements of deep inelastic scattering of electrons from ^{3}H and ^{3}He nuclei. The experiment was performed in the Hall A Facility of Jefferson Lab using two high-resolution spectrometers for electron detection, and a cryogenic target system which included a low-activity tritium cell. The data analysis used a novel technique exploiting the mirror symmetry of the two nuclei, which essentially eliminates many theoretical uncertainties in the extraction of the ratio. The results, which cover the Bjorken scaling variable range 0.19x0.83, represent a significant improvement compared to previous SLAC and Jefferson Lab measurements for the ratio. They are compared to recent theoretical calculations and empirical determinations of the F_{2}^{n}/F_{2}^{p} ratio.

Published
2022

11. Revealing the short-range structure of the mirror nuclei

Author

S, Li, R, Cruz-Torres, N, Santiesteban, Z H, Ye, D, Abrams, S, Alsalmi, D, Androic, K, Aniol, J, Arrington, T, Averett, C Ayerbe, Gayoso, J, Bane, S, Barcus, J, Barrow, A, Beck, V, Bellini, H, Bhatt, D, Bhetuwal, D, Biswas, D, Bulumulla, A, Camsonne, J, Castellanos, J, Chen, J-P, Chen, D, Chrisman, M E, Christy, C, Clarke, S, Covrig, K, Craycraft, D, Day, D, Dutta, E, Fuchey, C, Gal, F, Garibaldi, T N, Gautam, T, Gogami, J, Gomez, P, Guèye, A, Habarakada, T J, Hague, J O, Hansen, F, Hauenstein, W, Henry, D W, Higinbotham, R J, Holt, C, Hyde, T, Itabashi, M, Kaneta, A, Karki, A T, Katramatou, C E, Keppel, M, Khachatryan, V, Khachatryan, P M, King, I, Korover, L, Kurbany, T, Kutz, N, Lashley-Colthirst, W B, Li, H, Liu, N, Liyanage, E, Long, J, Mammei, P, Markowitz, R E, McClellan, F, Meddi, D, Meekins, S Mey-Tal, Beck, R, Michaels, M, Mihovilovič, A, Moyer, S, Nagao, V, Nelyubin, D, Nguyen, M, Nycz, M, Olson, L, Ou, V, Owen, C, Palatchi, B, Pandey, A, Papadopoulou, S, Park, S, Paul, T, Petkovic, R, Pomatsalyuk, S, Premathilake, V, Punjabi, R D, Ransome, P E, Reimer, J, Reinhold, S, Riordan, J, Roche, V M, Rodriguez, A, Schmidt, B, Schmookler, E P, Segarra, A, Shahinyan, K, Slifer, P, Solvignon, S, Širca, T, Su, R, Suleiman, H, Szumila-Vance, L, Tang, Y, Tian, W, Tireman, F, Tortorici, Y, Toyama, K, Uehara, G M, Urciuoli, D, Votaw, J, Williamson, B, Wojtsekhowski, S, Wood, J, Zhang, and X, Zheng

Abstract

When protons and neutrons (nucleons) are bound into atomic nuclei, they are close enough to feel significant attraction, or repulsion, from the strong, short-distance part of the nucleon-nucleon interaction. These strong interactions lead to hard collisions between nucleons, generating pairs of highly energetic nucleons referred to as short-range correlations (SRCs). SRCs are an important but relatively poorly understood part of nuclear structure

Published
2021

12. Probing few-body nuclear dynamics via ^{3}H and ^{3}He (e, {e}'p)pn cross-section measurements

Author

R, Cruz-Torres, D, Nguyen, F, Hauenstein, A, Schmidt, S, Li, D, Abrams, H, Albataineh, S, Alsalmi, D, Androic, K, Aniol, W, Armstrong, J, Arrington, H, Atac, T, Averett, C, Ayerbe Gayoso, X, Bai, J, Bane, S, Barcus, A, Beck, V, Bellini, F, Benmokhtar, H, Bhatt, D, Bhetuwal, D, Biswas, D, Blyth, W, Boeglin, D, Bulumulla, A, Camsonne, J, Castellanos, J-P, Chen, E O, Cohen, S, Covrig, K, Craycraft, B, Dongwi, M, Duer, B, Duran, D, Dutta, E, Fuchey, C, Gal, T N, Gautam, S, Gilad, K, Gnanvo, T, Gogami, J, Golak, J, Gomez, C, Gu, A, Habarakada, T, Hague, O, Hansen, M, Hattawy, O, Hen, D W, Higinbotham, E, Hughes, C, Hyde, H, Ibrahim, S, Jian, S, Joosten, H, Kamada, A, Karki, B, Karki, A T, Katramatou, C, Keppel, M, Khachatryan, V, Khachatryan, A, Khanal, D, King, P, King, I, Korover, T, Kutz, N, Lashley-Colthirst, G, Laskaris, W, Li, H, Liu, N, Liyanage, P, Markowitz, R E, McClellan, D, Meekins, S, Mey-Tal Beck, Z-E, Meziani, R, Michaels, M, Mihovilovič, V, Nelyubin, N, Nuruzzaman, M, Nycz, R, Obrecht, M, Olson, L, Ou, V, Owen, B, Pandey, V, Pandey, A, Papadopoulou, S, Park, M, Patsyuk, S, Paul, G G, Petratos, E, Piasetzky, R, Pomatsalyuk, S, Premathilake, A J R, Puckett, V, Punjabi, R, Ransome, M N H, Rashad, P E, Reimer, S, Riordan, J, Roche, M, Sargsian, N, Santiesteban, B, Sawatzky, E P, Segarra, B, Schmookler, A, Shahinyan, S, Širca, R, Skibiński, N, Sparveris, T, Su, R, Suleiman, H, Szumila-Vance, A S, Tadepalli, L, Tang, W, Tireman, K, Topolnicki, F, Tortorici, G, Urciuoli, L B, Weinstein, H, Witała, B, Wojtsekhowski, S, Wood, Z H, Ye, Z Y, Ye, and J, Zhang

Abstract

We report the first measurement of the (e,e^{'}p) three-body breakup reaction cross sections in helium-3 (^{3}He) and tritium (^{3}H) at large momentum transfer [⟨Q^{2}⟩≈1.9 (GeV/c)^{2}] and x_{B}1 kinematics, where the cross section should be sensitive to quasielastic (QE) scattering from single nucleons. The data cover missing momenta 40≤p_{miss}≤500 MeV/c that, in the QE limit with no rescattering, equals the initial momentum of the probed nucleon. The measured cross sections are compared with state-of-the-art ab initio calculations. Overall good agreement, within ±20%, is observed between data and calculations for the full p_{miss} range for ^{3}H and for 100≤p_{miss}≤350 MeV/c for ^{3}He. Including the effects of rescattering of the outgoing nucleon improves agreement with the data at p_{miss}250 MeV/c and suggests contributions from charge-exchange (SCX) rescattering. The isoscalar sum of ^{3}He plus ^{3}H, which is largely insensitive to SCX, is described by calculations to within the accuracy of the data over the entire p_{miss} range. This validates current models of the ground state of the three-nucleon system up to very high initial nucleon momenta of 500 MeV/c.

Published
2020

13. Deeply virtual Compton scattering off the neutron

Author

M. Benali, C. Desnault, M. Mazouz, Z. Ahmed, H. Albataineh, K. Allada, K. A. Aniol, V. Bellini, W. Boeglin, P. Bertin, M. Brossard, A. Camsonne, M. Canan, S. Chandavar, C. Chen, J.-P. Chen, M. Defurne, C. W. de Jager, R. de Leo, A. Deur, L. El Fassi, R. Ent, D. Flay, M. Friend, E. Fuchey, S. Frullani, F. Garibaldi, D. Gaskell, A. Giusa, O. Glamazdin, S. Golge, J. Gomez, O. Hansen, D. Higinbotham, T. Holmstrom, T. Horn, J. Huang, M. Huang, G. M. Huber, C. E. Hyde, S. Iqbal, F. Itard, Ho. Kang, Hy. Kang, A. Kelleher, C. Keppel, S. Koirala, I. Korover, J. J. LeRose, R. Lindgren, E. Long, M. Magne, J. Mammei, D. J. Margaziotis, P. Markowitz, A. Martí Jiménez-Argüello, F. Meddi, D. Meekins, R. Michaels, M. Mihovilovic, N. Muangma, C. Muñoz Camacho, P. Nadel-Turonski, N. Nuruzzaman, R. Paremuzyan, R. Pomatsalyuk, A. Puckett, V. Punjabi, Y. Qiang, A. Rakhman, M. N. H. Rashad, S. Riordan, J. Roche, G. Russo, F. Sabatié, K. Saenboonruang, A. Saha, B. Sawatzky, L. Selvy, A. Shahinyan, S. Sirca, P. Solvignon, M. L. Sperduto, R. Subedi, V. Sulkosky, C. Sutera, W. A. Tobias, G. M. Urciuoli, D. Wang, B. Wojtsekhowski, H. Yao, Z. Ye, L. Zana, X. Zhan, J. Zhang, B. Zhao, Z. Zhao, X. Zheng, P. Zhu, Laboratoire de Physique de Clermont (LPC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne (UCA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
quark: flavor, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Nuclear Theory, n: structure function, nucleon, FOS: Physical sciences, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, High Energy Physics - Experiment, 010305 fluids & plasmas, High Energy Physics - Phenomenology, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), deeply virtual Compton scattering, 0103 physical sciences, photon: scattering, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment
Abstract

The three-dimensional structure of nucleons (protons and neutrons) is embedded in so-called generalized parton distributions, which are accessible from deeply virtual Compton scattering. In this process, a high energy electron is scattered off a nucleon by exchanging a virtual photon. Then, a highly-energetic real photon is emitted from one of the quarks inside the nucleon, which carries information on the quark's transverse position and longitudinal momentum. By measuring the cross-section of deeply virtual Compton scattering, Compton form factors related to the generalized parton distributions can be extracted. Here, we report the observation of unpolarized deeply virtual Compton scattering off a deuterium target. From the measured photon-electroproduction cross-sections, we have extracted the cross-section of a quasi-free neutron and a coherent deuteron. Due to the approximate isospin symmetry of quantum chromodynamics, we can determine the contributions from the different quark flavours to the helicity-conserved Compton form factors by combining our measurements with previous ones probing the proton's internal structure. These results advance our understanding of the description of the nucleon structure, which is important to solve the proton spin puzzle.

Published
2020
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14. Study of the Λ/Σ0 electroproduction in the low-Q2 region at JLab

Author

K. Okuyama, K. Itabashi, S. Nagao, S. N. Nakamura, K. N. Suzuki, T. Gogami, B. Pandey, L. Tang, D. Abrams, T. Akiyama, D. Androic, K. Aniol, C. Ayerbe Gayoso, J. Bane, S. Barcus, J. Barrow, V. Bellini, H. Bhatt, D. Bhetuwal, D. Biswas, A. Camsonne, J. Castellanos, J-P. Chen, J. Chen, S. Covrig, D. Chrisman, R. Cruz-Torres, R. Das, E. Fuchey, K. Gnanvo, F. Garibaldi, T. Gautam, J. Gomez, P. Gueye, T. J. Hague, O. Hansen, W. Henry, F. Hauenstein, D. W. Higinbotham, C. E. Hyde, M. Kaneta, C. Keppel, T. Kutz, N. Lashley-Colthirst, S. Li, H. Liu, J. Mammei, P. Markowitz, R. E. McClellan, F. Meddi, D. Meekins, R. Michaels, M. Mihovilovic, A. Moyer, D. Nguyen, M. Nycz, V. Owen, C. Palatchi, S. Park, T. Petkovic, S. Premathilake, P. E. Reimer, J. Reinhold, S. Riordan, V. Rodriguez, C. Samanta, S. N. Santiesteban, B. Sawatzky, S. Širca, K. Slifer, T. Su, Y. Tian, Y. Toyama, K. Uehara, G. M. Urciuoli, D. Votaw, J. Williamson, B. Wojtsekhowski, S. A. Wood, B. Yale, Z. Ye, J. Zhang, and X. Zheng

Abstract

We performed an experiment using tritium and hydrogen cryogenic gas targets at Thomas Jefferson National Accelerator Facility (JLab) in 2018 (E12-17-003)[1, 2]. In this article, we discuss the Λ/Σ0 hyperon electroproduction from hydrogen target. Elementary Λ/Σ0 hyperon production processes are important not only for an absolute mass scale calibration in our experiment, but also for the study of the electroproduction mechanisms themselves. In this article, we reported the results of the differential cross section for the p(e, e’K+)Λ/Σ0 reaction at Q2 ∼ 0.5 (GeV/c)2.

Published
2022
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15. Cross-section measurement of virtual photoproduction of iso-triplet three-body hypernucleus, Λnn

Author

T. Gogami, K. N. Suzuki, B. Pandey, K. Itabashi, S. Nagao, K. Okuyama, S. N. Nakamura, L. Tang, D. Abrams, T. Akiyama, D. Androic, K. Aniol, C. Ayerbe Gayoso, J. Bane, S. Barcus, J. Barrow, V. Bellini, H. Bhatt, D. Bhetuwal, D. Biswas, A. Camsonne, J. Castellanos, J-P. Chen, J. Chen, S. Covrig, D. Chrisman, R. Cruz-Torres, R. Das, E. Fuchey, K. Gnanvo, F. Garibaldi, T. Gautam, J. Gomez, P. Gueye, T. J. Hague, O. Hansen, W. Henry, F. Hauenstein, D. W. Higinbotham, C. E. Hyde, M. Kaneta, C. Keppel, T. Kutz, N. Lashley-Colthirst, S. Li, H. Liu, J. Mammei, P. Markowitz, R. E. McClellan, F. Meddi, D. Meekins, R. Michaels, M. Mihovilovic, A. Moyer, D. Nguyen, M. Nycz, V. Owen, C. Palatchi, S. Park, T. Petkovic, S. Premathilake, P. E. Reimer, J. Reinhold, S. Riordan, V. Rodriguez, C. Samanta, S. N. Santiesteban, B. Sawatzky, S. Širca, K. Slifer, T. Su, Y. Tian, Y. Toyama, K. Uehara, G. M. Urciuoli, D. Votaw, J. Williamson, B. Wojtsekhowski, S. A. Wood, B. Yale, Z. Ye, J. Zhang, and X. Zheng

Abstract

Missing-mass spectroscopy with the 3H(e, e′K+) reaction was carried out at Jefferson Lab’s (JLab) Hall A in Oct–Nov, 2018. The differential cross section for the 3H(γ∗, K+)Λnn was deduced at ω = Ee − Ee′ = 2.102 GeV and at the forward K+-scattering angle (0° ≤ θγ∗K ≤ 5°) in the laboratory frame. Given typical predicted energies and decay widths, which are (BΛ, Γ) = (−0.25, 0.8) and (−0.55, 4.7) MeV, the cross sections were found to be 11.2 ± 4.8(stat.)+4.1−2.1(sys.) and 18.1 ± 6.8(stat.)+4.2−2.9(sys.) nb/sr, respectively. The obtained result would impose a constraint for interaction models particularly between Λ and neutron by comparing to theoretical calculations.

Published
2022
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16. Study of Λn FSI with Λ quasi-free productions on the 3H(e, e′K+)X reaction at JLab

Author

K. Itabashi, K.N. Suzuki, B. Pandey, K. Okuyama, T. Gogami, S. Nagao, S.N. Nakamura, L. Tang, D. Abrams, T. Akiyama, D. Androic, K. Aniol, C. Ayerbe Gayoso, J. Bane, S. Barcus, J. Barrow, V. Bellini, H. Bhatt, D. Bhetuwal, D. Biswas, A. Camsonne, J. Castellanos, J-P. Chen, J. Chen, S. Covrig, D. Chrisman, R. Cruz-Torres, R. Das, E. Fuchey, K. Gnanvo, F. Garibaldi, T. Gautam, J. Gomez, P. Gueye, T.J. Hague, O. Hansen, W. Henry, F. Hauenstein, D.W. Higinbotham, C.E. Hyde, M. Kaneta, C. Keppel, T. Kutz, N. Lashley-Colthirst, S. Li, H. Liu, J. Mammei, P. Markowitz, R. E. McClellan, F. Meddi, D. Meekins, R. Michaels, M. Mihovilovic, A. Moyer, D. Nguyen, M. Nycz, V. Owen, C. Palatchi, S. Park, T. Petkovic, S. Premathilake, P.E. Reimer, J. Reinhold, S. Riordan, V. Rodriguez, C. Samanta, S.N. Santiesteban, B. Sawatzky, S. Širca, K. Slifer, T. Su, Y. Tian, Y. Toyama, K. Uehara, G.M. Urciuoli, D. Votaw, J. Williamson, B. Wojtsekhowski, S.A. Wood, B. Yale, Z. Ye, J. Zhang, and X. Zheng

Abstract

An nnΛ is a neutral baryon system with no charge. The study of the pure Λ-neutron system such as nnΛ gives us information on the Λn interaction. The nnΛ search experiment (E12-17-003) was performed at JLab Hall A in 2018. In this article, the Λn FSI was investigated by a shape analysis of the 3H(e, e′K+)X missing mass spectrum, and a preliminary result for the Λn FSI study is given.

Published
2022
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18. Prospect for Measuring ${G_E^n}$ at High Momentum Transfers

Author

B. Wojtsekhowski

Subjects
Physics, Nuclear physics, Physics - Instrumentation and Detectors, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Nuclear Experiment (nucl-ex), High momentum, Nuclear Experiment
Abstract

Experiment E02-013, approved by PAC21, will measure the neutron electric form factor at \qsq~up to 3.4 \gvsq, which is twice that achieved to date. The main features of the new experiment will be the use of the electron spectrometer BigBite, a large array of neutron detectors, and a polarized \he3~target. We present the parameters and optimization of the experimental setup. A concept of an experiment for \GEN~where precision \GEP~data is used for calibration of the systematics of a Rosenbluth type measurement is also discussed. A concept of the circulating gas flow in the polarized He$^3$ target is presented., 9 pages, 4 figures, contribution to the proceedings of the workshop "Exclusive processes at High Momentum Transfer", May 15-18 2002, Newport News, Virginia, page 273-281

Published
2017

19. Rosenbluth Separation of the π^{0} Electroproduction Cross Section Off the Neutron

Author

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

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.

Published
2017

20. Precision Measurement of the p(e,e^{'}p)π^{0} Reaction at Threshold

Author

K, Chirapatpimol, M H, Shabestari, R A, Lindgren, L C, Smith, J R M, Annand, D W, Higinbotham, B, Moffit, V, Nelyubin, B E, Norum, K, Allada, K, Aniol, K, Ardashev, D S, Armstrong, R A, Arndt, F, Benmokhtar, A M, Bernstein, W, Bertozzi, W J, Briscoe, L, Bimbot, A, Camsonne, J-P, Chen, S, Choi, E, Chudakov, E, Cisbani, F, Cusanno, M M, Dalton, C, Dutta, K, Egiyan, C, Fernàndez-Ramìrez, R, Feuerbach, K G, Fissum, S, Frullani, F, Garibaldi, O, Gayou, R, Gilman, S, Gilad, J, Goity, J, Gomez, B, Hahn, D, Hamilton, J-O, Hansen, J, Huang, R, Igarashi, D, Ireland, C W, de Jager, X, Jin, X, Jiang, T, Jinasundera, J, Kellie, C E, Keppel, N, Kolb, J, LeRose, N, Liyanage, K, Livingston, D, McNulty, L, Mercado, R, Michaels, M, Mihovilovič, S, Qian, X, Qian, S, Mailyan, V, Mamyan, S, Marrone, P, Monaghan, S, Nanda, C F, Perdrisat, E, Piasetzky, D, Protopopescu, V, Punjabi, Y, Qiang, I A, Rachek, A, Rakhman, S, Riordan, G, Ron, G, Rosner, A, Saha, B, Sawatzky, A, Shahinyan, S, Širca, N, Sparveris, R R, Subedi, R, Suleiman, I, Strakovsky, V, Sulkosky, J, Moinelo, H, Voskanyan, K, Wang, Y, Wang, J, Watson, D, Watts, B, Wojtsekhowski, R L, Workman, H, Yao, X, Zhan, and Y, Zhang

Abstract

New results are reported from a measurement of π^{0} electroproduction near threshold using the p(e,e^{'}p)π^{0} reaction. The experiment was designed to determine precisely the energy dependence of s- and p-wave electromagnetic multipoles as a stringent test of the predictions of chiral perturbation theory (ChPT). The data were taken with an electron beam energy of 1192 MeV using a two-spectrometer setup in Hall A at Jefferson Lab. For the first time, complete coverage of the ϕ_{π}^{*} and θ_{π}^{*} angles in the pπ^{0} center of mass was obtained for invariant energies above threshold from 0.5 up to 15 MeV. The 4-momentum transfer Q^{2} coverage ranges from 0.05 to 0.155 (GeV/c)^{2} in fine steps. A simple phenomenological analysis of our data shows strong disagreement with p-wave predictions from ChPT for Q^{2}0.07 (GeV/c)^{2}, while the s-wave predictions are in reasonable agreement.

Published
2015

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

Author

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

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.

Published
2015

22. On measurement of the isotropy of the speed of light

Author

B. Wojtsekhowski

Subjects
Physics, Physics - Instrumentation and Detectors, Magnetic moment, business.industry, Isotropy, FOS: Physical sciences, General Physics and Astronomy, Resonance, Instrumentation and Detectors (physics.ins-det), General Relativity and Quantum Cosmology (gr-qc), Electron, Electron magnetic dipole moment, Speed of light (cellular automaton), Space Physics (physics.space-ph), General Relativity and Quantum Cosmology, law.invention, Optics, Physics - Space Physics, law, Physics::Accelerator Physics, High Energy Physics::Experiment, Collider, business, Anisotropy
Abstract

Three experimental concepts investigating possible anisotropy of the speed of light are presented. They are based on i) beam deflection in a 180 degree magnetic arc, ii) narrow resonance production in an electron-positron collider, and iii) the ratio of magnetic moments of an electron and a positron moving in opposite directions., a discussion of the high precision tests of special relativity, double ratio with e+ & e- beams

Published
2014

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

Author

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

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.

Published
2014

24. Measurement of double-polarization asymmetries in the quasielastic he → 3 (e →,e′d) process

Author

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

Subjects
Physics and Astronomy (all)
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.

Published
2014

25. GEp/GMpRatio by Polarization Transfer ine→p→ep→

Author

M. K. Jones, K. A. Aniol, F. T. Baker, J. Berthot, P. Y. Bertin, W. Bertozzi, A. Besson, L. Bimbot, W. U. Boeglin, E. J. Brash, D. Brown, J. R. Calarco, L. S. Cardman, C.-C. Chang, J.-P. Chen, E. Chudakov, S. Churchwell, E. Cisbani, D. S. Dale, R. De Leo, A. Deur, B. Diederich, J. J. Domingo, M. B. Epstein, L. A. Ewell, K. G. Fissum, A. Fleck, H. Fonvieille, S. Frullani, J. Gao, F. Garibaldi, A. Gasparian, G. Gerstner, S. Gilad, R. Gilman, A. Glamazdin, C. Glashausser, J. Gomez, V. Gorbenko, A. Green, J.-O. Hansen, C. R. Howell, G. M. Huber, M. Iodice, C. W. de Jager, S. Jaminion, X. Jiang, W. Kahl, J. J. Kelly, M. Khayat, L. H. Kramer, G. Kumbartzki, M. Kuss, E. Lakuriki, G. Lavessière, J. J. LeRose, M. Liang, R. A. Lindgren, N. Liyanage, G. J. Lolos, R. Macri, R. Madey, S. Malov, D. J. Margaziotis, P. Markowitz, K. McCormick, J. I. McIntyre, R. L. J. van der Meer, R. Michaels, B. D. Milbrath, J. Y. Mougey, S. K. Nanda, E. A. J. M. Offermann, Z. Papandreou, C. F. Perdrisat, G. G. Petratos, N. M. Piskunov, R. I. Pomatsalyuk, D. L. Prout, V. Punjabi, G. Quéméner, R. D. Ransome, B. A. Raue, Y. Roblin, R. Roche, G. Rutledge, P. M. Rutt, A. Saha, T. Saito, A. J. Sarty, T. P. Smith, P. Sorokin, S. Strauch, R. Suleiman, K. Takahashi, J. A. Templon, L. Todor, P. E. Ulmer, G. M. Urciuoli, P. Vernin, B. Vlahovic, H. Voskanyan, K. Wijesooriya, B. B. Wojtsekhowski, R. J. Woo, F. Xiong, G. D. Zainea, and Z.-L. Zhou

Subjects
Elastic scattering, Physics, Proton, 010308 nuclear & particles physics, Proton magnetic moment, General Physics and Astronomy, Electron, Polarization (waves), 01 natural sciences, Charged particle, Nuclear physics, Magnetization, 0103 physical sciences, Magnetic form factor, Physics::Accelerator Physics, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract

The ratio of the proton's elastic electromagnetic form factors was obtained by measuring the transverse and longitudinal polarizations of recoiling protons from the elastic scattering of polarized electrons with unpolarized protons. The ratio of the electric to magnetic form factor is proportional to the ratio of the transverse to longitudinal recoil polarizations. The ratio was measured over a range of four-momentum transfer squared between 0.5 and 3.5 GeV-squared. Simultaneous measurement of transverse and longitudinal polarizations in a polarimeter provides good control of the systematic uncertainty. The results for the ratio of the proton's electric to magnetic form factors show a systematic decrease with increasing four momentum squared, indicating for the first time a marked difference in the spatial distribution of charge and magnetization currents in the proton.

Published
2000
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26. A precise electron beam energy calibration for use in nuclear physics

Author

J. Shaw, S. B. Soong, K. Joo, W. Turchinetz, G. W. Dodson, Evgeni Tsentalovich, M. Farkhondeh, Ricardo Alarcon, B. B. Wojtsekhowski, K. A. Dow, T. Zwart, S. Kowalski, S. Dolfini, E. Booth, K. Jacobs, and A. Young

Subjects
Physics, Nuclear and High Energy Physics, Beam diameter, Magnet, Spin diffusion, Time constant, Cathode ray, Physics::Accelerator Physics, M squared, Atomic physics, Polarization (waves), Instrumentation, Linear particle accelerator
Abstract

An accurate calibration of the MIT-Bates electron beam energy has been achieved. The electron beam was injected into the MIT-Bates South Hall Ring and the spin-precession frequency, Ω s , was measured. From the spin-precession frequency the equilibrium energy of the ring was determined to be 370.3115±0.0021±0.0004 MeV, where the first error is statistical and the second is systematic. The energy of the beam delivered by the linac was determined to be 369.954±0.023±0.300 MeV. This provides a rigorous check on the accuracy of the facility's energy analyzing magnets. The first moment of the energy distribution was also measured. By observing the time constant of the spin diffusion with zero power in the South Hall Ring RF cavity, we obtained a value of σ γ γ = (3.7±0.5) × 10 −4 . We provide a lower limit to the polarization lifetime. At a beam energy of 370 MeV no measurable decrease in the polarization was observed up to 2 ms after injection.

Published
1997
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27. Measurement of the target-normal single-spin asymmetry in deep-inelastic scattering from the reaction (3)He(↑)(e,e')X

Author

J, Katich, X, Qian, Y X, Zhao, K, Allada, K, Aniol, J R M, Annand, T, Averett, F, Benmokhtar, W, Bertozzi, P C, Bradshaw, P, Bosted, A, Camsonne, M, Canan, G D, Cates, C, Chen, J-P, Chen, W, Chen, K, Chirapatpimol, E, Chudakov, E, Cisbani, J C, Cornejo, F, Cusanno, M M, Dalton, W, Deconinck, C W, de Jager, R, De Leo, X, Deng, A, Deur, H, Ding, P A M, Dolph, C, Dutta, D, Dutta, L, El Fassi, S, Frullani, H, Gao, F, Garibaldi, D, Gaskell, S, Gilad, R, Gilman, O, Glamazdin, S, Golge, L, Guo, D, Hamilton, O, Hansen, D W, Higinbotham, T, Holmstrom, J, Huang, M, Huang, H F, Ibrahim, M, Iodice, X, Jiang, G, Jin, M K, Jones, A, Kelleher, W, Kim, A, Kolarkar, W, Korsch, J J, LeRose, X, Li, Y, Li, R, Lindgren, N, Liyanage, E, Long, H-J, Lu, D J, Margaziotis, P, Markowitz, S, Marrone, D, McNulty, Z-E, Meziani, R, Michaels, B, Moffit, C, Muñoz Camacho, S, Nanda, A, Narayan, V, Nelyubin, B, Norum, Y, Oh, M, Osipenko, D, Parno, J C, Peng, S K, Phillips, M, Posik, A J R, Puckett, Y, Qiang, A, Rakhman, R D, Ransome, S, Riordan, A, Saha, B, Sawatzky, E, Schulte, A, Shahinyan, M H, Shabestari, S, Širca, S, Stepanyan, R, Subedi, V, Sulkosky, L-G, Tang, A, Tobias, G M, Urciuoli, I, Vilardi, K, Wang, Y, Wang, B, Wojtsekhowski, X, Yan, H, Yao, Y, Ye, Z, Ye, L, Yuan, X, Zhan, Y, Zhang, Y-W, Zhang, B, Zhao, X, Zheng, L, Zhu, X, Zhu, and X, Zong

Abstract

We report the first measurement of the target-normal single-spin asymmetry in deep-inelastic scattering from the inclusive reaction 3)He(↑)(e,e')X on a polarized (3)He gas target. Assuming time-reversal invariance, this asymmetry is strictly zero in the Born approximation but can be nonzero if two-photon-exchange contributions are included. The experiment, conducted at Jefferson Lab using a 5.89 GeV electron beam, covers a range of 1.7W2.9 GeV, 1.0Q(2)4.0 GeV(2) and 0.16x0.65. Neutron asymmetries were extracted using the effective nucleon polarization and measured proton-to-(3)He cross-section ratios. The measured neutron asymmetries are negative with an average value of (-1.09±0.38)×10(-2) for invariant mass W2 GeV, which is nonzero at the 2.89σ level. Our measured asymmetry agrees both in sign and magnitude with a two-photon-exchange model prediction that uses input from the Sivers transverse momentum distribution obtained from semi-inclusive deep-inelastic scattering.

Published
2013

28. Test of the OZI rule in hadroproduction ofφφandφK+K−

Author

R. S. Longacre, E. Efstathiadis, K Vazeri, C Landberg, K. Zhao, S. J. Lindenbaum, G. S. Adams, B Wojtsekhowski, A Wright, C.S. Chan, R. W. Hackenburg, Y. Zhu, and M. A. Kramer

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Pion, OZI rule, ComputingMethodologies_SIMULATIONANDMODELING, Computer Science::Information Retrieval, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, ComputerSystemsOrganization_SPECIAL-PURPOSEANDAPPLICATION-BASEDSYSTEMS, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment
Abstract

The cross sections for {phi}{phi} and {phi}{ital K}{sup +}{ital K}{sup {minus}} production were measured with 8 GeV/{ital c} pion and kaon beams to examine the OZI suppression of the reaction {pi}{sup {minus}}{ital p}{r_arrow}{phi}{phi}{ital n}. The measured cross section ratios indicate that this reaction is not suppressed for {phi}{phi} invariant masses up to 2.5 GeV/{ital c}{sup 2}. {copyright} {ital 1996 The American Physical Society.}

Published
1996
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29. Transverse-Longitudinal Asymmetry in the QuasielasticHe→3(e→, e′)Reaction

Author

Michael Pitt, Wolfgang Lorenzon, D. R. Tieger, B. Bray, R. Carr, E. J. Beise, J. O. Hansen, B. B. Wojtsekhowski, B. W. Filippone, Haiyan Gao, C. E. Jones, Kisoo Lee, P. U. Sauer, L. H. Kramer, E. Candell, W. Korsch, C. Tripp, J. Napolitano, D. DeSchepper, T.W. Donnelly, M. Farkhondeh, A. Lung, Ross Milner, Naomi C R Makins, G. W. Dodson, J. Arrington, R.-W. Schulze, M. A. Titko, B. Mueller, R. D. McKeown, K. Dow R. Ent, and T. P. Welch

Subjects
Physics, Nuclear reaction, Quasielastic scattering, media_common.quotation_subject, Nuclear Theory, Momentum transfer, Plane wave, General Physics and Astronomy, Asymmetry, Nuclear physics, Transverse plane, High Energy Physics::Experiment, Nuclear Experiment, Nucleon, Wave function, media_common
Abstract

The transverse-longitudinal asymmetry ATL′ in 3He→(e→, e′) quasielastic scattering at momentum transfer Q2=0.14 (GeV/c)^2 has been measured to be 1.52 ± 0.55(stat) ± 0.15(syst)%. The plane wave impulse approximation (PWIA) prediction for this measurement ranges from 2.1% to 2.9%, where the variation is due to uncertainty in the initial state wave function, nucleon form factors, and off-shell prescription. The data may suggest a suppression with respect to the PWIA, which has also been observed for the unpolarized longitudinal response function.

Published
1995
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30. Measurement of the Neutron Radius of 208Pb Through Parity-Violation in Electron Scattering

Author

S, Abrahamyan, Z, Ahmed, H, Albataineh, K, Aniol, D S, Armstrong, W, Armstrong, T, Averett, B, Babineau, A, Barbieri, V, Bellini, R, Beminiwattha, J, Benesch, F, Benmokhtar, T, Bielarski, W, Boeglin, A, Camsonne, M, Canan, P, Carter, G D, Cates, C, Chen, J-P, Chen, O, Hen, F, Cusanno, M M, Dalton, R, De Leo, K, de Jager, W, Deconinck, P, Decowski, X, Deng, A, Deur, D, Dutta, A, Etile, D, Flay, G B, Franklin, M, Friend, S, Frullani, E, Fuchey, F, Garibaldi, E, Gasser, R, Gilman, A, Giusa, A, Glamazdin, J, Gomez, J, Grames, C, Gu, O, Hansen, J, Hansknecht, D W, Higinbotham, R S, Holmes, T, Holmstrom, C J, Horowitz, J, Hoskins, J, Huang, C E, Hyde, F, Itard, C-M, Jen, E, Jensen, G, Jin, S, Johnston, A, Kelleher, K, Kliakhandler, P M, King, S, Kowalski, K S, Kumar, J, Leacock, J, Leckey, J H, Lee, J J, LeRose, R, Lindgren, N, Liyanage, N, Lubinsky, J, Mammei, F, Mammoliti, D J, Margaziotis, P, Markowitz, A, McCreary, D, McNulty, L, Mercado, Z-E, Meziani, R W, Michaels, M, Mihovilovic, N, Muangma, C, Muñoz-Camacho, S, Nanda, V, Nelyubin, N, Nuruzzaman, Y, Oh, A, Palmer, D, Parno, K D, Paschke, S K, Phillips, B, Poelker, R, Pomatsalyuk, M, Posik, A J R, Puckett, B, Quinn, A, Rakhman, P E, Reimer, S, Riordan, P, Rogan, G, Ron, G, Russo, K, Saenboonruang, A, Saha, B, Sawatzky, A, Shahinyan, R, Silwal, S, Sirca, K, Slifer, P, Solvignon, P A, Souder, M L, Sperduto, R, Subedi, R, Suleiman, V, Sulkosky, C M, Sutera, W A, Tobias, W, Troth, G M, Urciuoli, B, Waidyawansa, D, Wang, J, Wexler, R, Wilson, B, Wojtsekhowski, X, Yan, H, Yao, Y, Ye, Z, Ye, V, Yim, L, Zana, X, Zhan, J, Zhang, Y, Zhang, X, Zheng, and P, Zhu

Subjects
Nuclear Theory, FOS: Physical sciences, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

We report the first measurement of the parity-violating asymmetry A_PV in the elastic scattering of polarized electrons from 208Pb. A_PV is sensitive to the radius of the neutron distribution (Rn). The result A_PV = 0.656 \pm 0.060 (stat) \pm 0.014 (syst) ppm corresponds to a difference between the radii of the neutron and proton distributions Rn - Rp = 0.33 +0.16 -0.18 fm and provides the first electroweak observation of the neutron skin which is expected in a heavy, neutron-rich nucleus., Comment: 6 pages, 1 figure

Published
2012
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31. Measurement of the neutron magnetic form factor from inclusive quasielastic scattering of polarized electrons from polarizedHe3

Author

B. B. Wojtsekhowski, J. O. Hansen, Richard G. Milner, Naomi C R Makins, M. Farkhondeh, E. J. Beise, B. Bray, T. P. Welch, C. Tripp, D. DeSchepper, E. Candell, D. R. Tieger, C. E. Jones, W. Lorenzon, R. Carr, B. W. Filippone, Michael Pitt, R. Ent, W. Korsch, B. Mueller, R. D. McKeown, A. Lung, K. A. Dow, Jim Napolitano, G. W. Dodson, L. H. Kramer, Haiyan Gao, J. Arrington, and K. Lee

Subjects
Nuclear physics, Nuclear reaction, Physics, Nuclear and High Energy Physics, Dipole, Quasielastic scattering, Scattering, Computer Science::Information Retrieval, Magnetic form factor, Neutron, Atomic physics, Nucleon, Electron scattering
Abstract

We report a measurement of the asymmetry in spin-dependent quasielastic scattering of longitudinally polarized electrons from a polarized [sup 3]He target. The neutron magnetic form factor [ital G][sup [ital n]][sub [ital M]] has been extracted from the measured asymmetry based on recent PWIA calculations using spin-dependent spectral functions. Our determination of [ital G][sup [ital n]][sub [ital M]] at [ital Q][sup 2]=0.19 (GeV/[ital c])[sup 2] agrees with the dipole parametrization. This experiment represents the first measurement of the neutron magnetic form factor using spin-dependent electron scattering.

Published
1994
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32. Beam-target double-spin asymmetry A{LT} in charged pion production from deep inelastic scattering on a transversely polarized {3}He target at 1.4Q{2}2.7 GeV{2}

Author

J, Huang, K, Allada, C, Dutta, J, Katich, X, Qian, Y, Wang, Y, Zhang, K, Aniol, J R M, Annand, T, Averett, F, Benmokhtar, W, Bertozzi, P C, Bradshaw, P, Bosted, A, Camsonne, M, Canan, G D, Cates, C, Chen, J-P, Chen, W, Chen, K, Chirapatpimol, E, Chudakov, E, Cisbani, J C, Cornejo, F, Cusanno, M M, Dalton, W, Deconinck, C W, de Jager, R, De Leo, X, Deng, A, Deur, H, Ding, P A M, Dolph, D, Dutta, L, El Fassi, S, Frullani, H, Gao, F, Garibaldi, D, Gaskell, S, Gilad, R, Gilman, O, Glamazdin, S, Golge, L, Guo, D, Hamilton, O, Hansen, D W, Higinbotham, T, Holmstrom, M, Huang, H F, Ibrahim, M, Iodice, X, Jiang, G, Jin, M K, Jones, A, Kelleher, W, Kim, A, Kolarkar, W, Korsch, J J, Lerose, X, Li, Y, Li, R, Lindgren, N, Liyanage, E, Long, H-J, Lu, D J, Margaziotis, P, Markowitz, S, Marrone, D, McNulty, Z-E, Meziani, R, Michaels, B, Moffit, C, Muñoz Camacho, S, Nanda, A, Narayan, V, Nelyubin, B, Norum, Y, Oh, M, Osipenko, D, Parno, J C, Peng, S K, Phillips, M, Posik, A J R, Puckett, Y, Qiang, A, Rakhman, R D, Ransome, S, Riordan, A, Saha, B, Sawatzky, E, Schulte, A, Shahinyan, M H, Shabestari, S, Sirca, S, Stepanyan, R, Subedi, V, Sulkosky, L-G, Tang, A, Tobias, G M, Urciuoli, I, Vilardi, K, Wang, B, Wojtsekhowski, X, Yan, H, Yao, Y, Ye, Z, Ye, L, Yuan, X, Zhan, Y-W, Zhang, B, Zhao, X, Zheng, L, Zhu, X, Zhu, and X, Zong

Abstract

We report the first measurement of the double-spin asymmetry A{LT} for charged pion electroproduction in semi-inclusive deep-inelastic electron scattering on a transversely polarized {3}He target. The kinematics focused on the valence quark region, 0.16x0.35 with 1.4Q{2}2.7 GeV{2}. The corresponding neutron A{LT} asymmetries were extracted from the measured {3}He asymmetries and proton over {3}He cross section ratios using the effective polarization approximation. These new data probe the transverse momentum dependent parton distribution function g{1T}{q} and therefore provide access to quark spin-orbit correlations. Our results indicate a positive azimuthal asymmetry for π{-} production on {3}He and the neutron, while our π{+} asymmetries are consistent with zero.

Published
2011

33. Single spin asymmetries in charged pion production from semi-inclusive deep inelastic scattering on a transversely polarized 3He Target at Q2 = 1.4-2.7 GeV2

Author

X, Qian, K, Allada, C, Dutta, J, Huang, J, Katich, Y, Wang, Y, Zhang, K, Aniol, J R M, Annand, T, Averett, F, Benmokhtar, W, Bertozzi, P C, Bradshaw, P, Bosted, A, Camsonne, M, Canan, G D, Cates, C, Chen, J-P, Chen, W, Chen, K, Chirapatpimol, E, Chudakov, E, Cisbani, J C, Cornejo, F, Cusanno, M M, Dalton, W, Deconinck, C W, de Jager, R, De Leo, X, Deng, A, Deur, H, Ding, P A M, Dolph, D, Dutta, L, El Fassi, S, Frullani, H, Gao, F, Garibaldi, D, Gaskell, S, Gilad, R, Gilman, O, Glamazdin, S, Golge, L, Guo, D, Hamilton, O, Hansen, D W, Higinbotham, T, Holmstrom, M, Huang, H F, Ibrahim, M, Iodice, X, Jiang, G, Jin, M K, Jones, A, Kelleher, W, Kim, A, Kolarkar, W, Korsch, J J, LeRose, X, Li, Y, Li, R, Lindgren, N, Liyanage, E, Long, H-J, Lu, D J, Margaziotis, P, Markowitz, S, Marrone, D, McNulty, Z-E, Meziani, R, Michaels, B, Moffit, C Muñoz, Camacho, S, Nanda, A, Narayan, V, Nelyubin, B, Norum, Y, Oh, M, Osipenko, D, Parno, J C, Peng, S K, Phillips, M, Posik, A J R, Puckett, Y, Qiang, A, Rakhman, R D, Ransome, S, Riordan, A, Saha, B, Sawatzky, E, Schulte, A, Shahinyan, M H, Shabestari, S, Sirca, S, Stepanyan, R, Subedi, V, Sulkosky, L-G, Tang, A, Tobias, G M, Urciuoli, I, Vilardi, K, Wang, B, Wojtsekhowski, X, Yan, H, Yao, Y, Ye, Z, Ye, L, Yuan, X, Zhan, Y-W, Zhang, B, Zhao, X, Zheng, L, Zhu, X, Zhu, and X, Zong

Abstract

We report the first measurement of target single spin asymmetries in the semi-inclusive (3)He(e,e'π(±))X reaction on a transversely polarized target. The experiment, conducted at Jefferson Lab using a 5.9 GeV electron beam, covers a range of 0.16x0.35 with 1.4Q(2)2.7 GeV(2). The Collins and Sivers moments were extracted from the azimuthal angular dependence of the measured asymmetries. The π(±) Collins moments for (3)He are consistent with zero, except for the π(+) moment at x = 0.35, which deviates from zero by 2.3σ. While the π(-) Sivers moments are consistent with zero, the π(+) Sivers moments favor negative values. The neutron results were extracted using the nucleon effective polarization and measured cross section ratios of proton to (3)He, and are largely consistent with the predictions of phenomenological fits and quark model calculations.

Published
2011

35. Measurements of the Electric Form Factor of the Neutron up toQ2=3.4 GeV2Using the Reaction3He→(e→,e′n)pp

Author

S. Riordan, S. Abrahamyan, B. Craver, A. Kelleher, A. Kolarkar, J. Miller, G. D. Cates, N. Liyanage, B. Wojtsekhowski, A. Acha, K. Allada, B. Anderson, K. A. Aniol, J. R. M. Annand, J. Arrington, T. Averett, A. Beck, M. Bellis, W. Boeglin, H. Breuer, J. R. Calarco, A. Camsonne, J. P. Chen, E. Chudakov, L. Coman, B. Crowe, F. Cusanno, D. Day, P. Degtyarenko, P. A. M. Dolph, C. Dutta, C. Ferdi, C. Fernández-Ramírez, R. Feuerbach, L. M. Fraile, G. Franklin, S. Frullani, S. Fuchs, F. Garibaldi, N. Gevorgyan, R. Gilman, A. Glamazdin, J. Gomez, K. Grimm, J.-O. Hansen, J. L. Herraiz, D. W. Higinbotham, R. Holmes, T. Holmstrom, D. Howell, C. W. de Jager, X. Jiang, M. K. Jones, J. Katich, L. J. Kaufman, M. Khandaker, J. J. Kelly, D. Kiselev, W. Korsch, J. LeRose, R. Lindgren, P. Markowitz, D. J. Margaziotis, S. May-Tal Beck, S. Mayilyan, K. McCormick, Z.-E. Meziani, R. Michaels, B. Moffit, S. Nanda, V. Nelyubin, T. Ngo, D. M. Nikolenko, B. Norum, L. Pentchev, C. F. Perdrisat, E. Piasetzky, R. Pomatsalyuk, D. Protopopescu, A. J. R. Puckett, V. A. Punjabi, X. Qian, Y. Qiang, B. Quinn, I. Rachek, R. D. Ransome, P. E. Reimer, B. Reitz, J. Roche, G. Ron, O. Rondon, G. Rosner, A. Saha, M. M. Sargsian, B. Sawatzky, J. Segal, M. Shabestari, A. Shahinyan, Yu. Shestakov, J. Singh, S. Širca, P. Souder, S. Stepanyan, V. Stibunov, V. Sulkosky, S. Tajima, W. A. Tobias, J. M. Udias, G. M. Urciuoli, B. Vlahovic, H. Voskanyan, K. Wang, F. R. Wesselmann, J. R. Vignote, S. A. Wood, J. Wright, H. Yao, and X. Zhu

Subjects
Physics, Momentum transfer, Electric form factor, General Physics and Astronomy, Neutron, Atomic physics, Polarized target
Abstract

The electric form factor of the neutron was determined from studies of the reaction ${}^{3}\stackrel{\ensuremath{\rightarrow}}{\mathrm{He}}(\stackrel{\ensuremath{\rightarrow}}{e},{e}^{\ensuremath{'}}n)pp$ in quasielastic kinematics in Hall A at Jefferson Lab. Longitudinally polarized electrons were scattered off a polarized target in which the nuclear polarization was oriented perpendicular to the momentum transfer. The scattered electrons were detected in a magnetic spectrometer in coincidence with neutrons that were registered in a large-solid-angle detector. More than doubling the ${Q}^{2}$ range over which it is known, we find ${G}_{E}^{n}=0.0236\ifmmode\pm\else\textpm\fi{}0.0017(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.0026(\mathrm{syst})$, $0.0208\ifmmode\pm\else\textpm\fi{}0.0024\ifmmode\pm\else\textpm\fi{}0.0019$, and $0.0147\ifmmode\pm\else\textpm\fi{}0.0020\ifmmode\pm\else\textpm\fi{}0.0014$ for ${Q}^{2}=1.72$, 2.48, and $3.41\text{ }\text{ }{\mathrm{GeV}}^{2}$, respectively.

Published
2010
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36. Search for effects beyond the born approximation in polarization transfer observables in e(over→)p elastic scattering

Author

M, Meziane, E J, Brash, R, Gilman, M K, Jones, W, Luo, L, Pentchev, C F, Perdrisat, A J R, Puckett, V, Punjabi, F R, Wesselmann, A, Ahmidouch, I, Albayrak, K A, Aniol, J, Arrington, A, Asaturyan, O, Ates, H, Baghdasaryan, F, Benmokhtar, W, Bertozzi, L, Bimbot, P, Bosted, W, Boeglin, C, Butuceanu, P, Carter, S, Chernenko, E, Christy, M, Commisso, J C, Cornejo, S, Covrig, S, Danagoulian, A, Daniel, A, Davidenko, D, Day, S, Dhamija, D, Dutta, R, Ent, S, Frullani, H, Fenker, E, Frlez, F, Garibaldi, D, Gaskell, S, Gilad, Y, Goncharenko, K, Hafidi, D, Hamilton, D W, Higinbotham, W, Hinton, T, Horn, B, Hu, J, Huang, G M, Huber, E, Jensen, H, Kang, C, Keppel, M, Khandaker, P, King, D, Kirillov, M, Kohl, V, Kravtsov, G, Kumbartzki, Y, Li, V, Mamyan, D J, Margaziotis, P, Markowitz, A, Marsh, Y, Matulenko, J, Maxwell, G, Mbianda, D, Meekins, Y, Melnik, J, Miller, A, Mkrtchyan, H, Mkrtchyan, B, Moffit, O, Moreno, J, Mulholland, A, Narayan, Nuruzzaman, S, Nedev, E, Piasetzky, W, Pierce, N M, Piskunov, Y, Prok, R D, Ransome, D S, Razin, P E, Reimer, J, Reinhold, O, Rondon, M, Shabestari, A, Shahinyan, K, Shestermanov, S, Širca, I, Sitnik, L, Smykov, G, Smith, L, Solovyev, P, Solvignon, R, Subedi, R, Suleiman, E, Tomasi-Gustafsson, A, Vasiliev, M, Vanderhaeghen, M, Veilleux, B B, Wojtsekhowski, S, Wood, Z, Ye, Y, Zanevsky, X, Zhang, Y, Zhang, X, Zheng, and L, Zhu

Abstract

Intensive theoretical and experimental efforts over the past decade have aimed at explaining the discrepancy between data for the proton electric to magnetic form factor ratio, G(E)/G(M), obtained separately from cross section and polarization transfer measurements. One possible explanation for this difference is a two-photon-exchange contribution. In an effort to search for effects beyond the one-photon-exchange or Born approximation, we report measurements of polarization transfer observables in the elastic H(e[over →],e(')p[over →]) reaction for three different beam energies at a Q(2)=2.5 GeV(2), spanning a wide range of the kinematic parameter ε. The ratio R, which equals μ(p)G(E)/G(M) in the Born approximation, is found to be independent of ε at the 1.5% level. The ε dependence of the longitudinal polarization transfer component P(ℓ) shows an enhancement of (2.3±0.6)% relative to the Born approximation at large ε.

Published
2010

37. Precise extraction of the induced polarization in the 4He(e,e'p)3H reaction

Author

S P, Malace, M, Paolone, S, Strauch, I, Albayrak, J, Arrington, B L, Berman, E J, Brash, B, Briscoe, A, Camsonne, J-P, Chen, M E, Christy, E, Chudakov, E, Cisbani, B, Craver, F, Cusanno, R, Ent, F, Garibaldi, R, Gilman, O, Glamazdin, J, Glister, D W, Higinbotham, C E, Hyde-Wright, Y, Ilieva, C W, de Jager, X, Jiang, M K, Jones, C E, Keppel, E, Khrosinkova, E, Kuchina, G, Kumbartzki, B, Lee, R, Lindgren, D J, Margaziotis, D, Meekins, R, Michaels, K, Park, L, Pentchev, C F, Perdrisat, E, Piasetzky, V A, Punjabi, A J R, Puckett, X, Qian, Y, Qiang, R D, Ransome, A, Saha, A J, Sarty, E, Schulte, P, Solvignon, R R, Subedi, L, Tang, D, Tedeschi, V, Tvaskis, J M, Udias, P E, Ulmer, J R, Vignote, F R, Wesselmann, B, Wojtsekhowski, and X, Zhan

Abstract

We measured with unprecedented precision the induced polarization P(y) in (4)He(e,e'p)(3)H at Q(2)=0.8 and 1.3 (GeV/c)(2). The induced polarization is indicative of reaction-mechanism effects beyond the impulse approximation. Our results are in agreement with a relativistic distorted-wave impulse approximation calculation but are overestimated by a calculation with strong charge-exchange effects. Our data are used to constrain the strength of the spin-independent charge-exchange term in the latter calculation.

Published
2010

38. Measurements of the electric form factor of the neutron up to Q2=3.4 GeV2 using the reaction 3He(e,e'n)pp

Author

S, Riordan, S, Abrahamyan, B, Craver, A, Kelleher, A, Kolarkar, J, Miller, G D, Cates, N, Liyanage, B, Wojtsekhowski, A, Acha, K, Allada, B, Anderson, K A, Aniol, J R M, Annand, J, Arrington, T, Averett, A, Beck, M, Bellis, W, Boeglin, H, Breuer, J R, Calarco, A, Camsonne, J P, Chen, E, Chudakov, L, Coman, B, Crowe, F, Cusanno, D, Day, P, Degtyarenko, P A M, Dolph, C, Dutta, C, Ferdi, C, Fernández-Ramírez, R, Feuerbach, L M, Fraile, G, Franklin, S, Frullani, S, Fuchs, F, Garibaldi, N, Gevorgyan, R, Gilman, A, Glamazdin, J, Gomez, K, Grimm, J-O, Hansen, J L, Herraiz, D W, Higinbotham, R, Holmes, T, Holmstrom, D, Howell, C W, de Jager, X, Jiang, M K, Jones, J, Katich, L J, Kaufman, M, Khandaker, J J, Kelly, D, Kiselev, W, Korsch, J, LeRose, R, Lindgren, P, Markowitz, D J, Margaziotis, S May-Tal, Beck, S, Mayilyan, K, McCormick, Z-E, Meziani, R, Michaels, B, Moffit, S, Nanda, V, Nelyubin, T, Ngo, D M, Nikolenko, B, Norum, L, Pentchev, C F, Perdrisat, E, Piasetzky, R, Pomatsalyuk, D, Protopopescu, A J R, Puckett, V A, Punjabi, X, Qian, Y, Qiang, B, Quinn, I, Rachek, R D, Ransome, P E, Reimer, B, Reitz, J, Roche, G, Ron, O, Rondon, G, Rosner, A, Saha, M M, Sargsian, B, Sawatzky, J, Segal, M, Shabestari, A, Shahinyan, Yu, Shestakov, J, Singh, S, Sirca, P, Souder, S, Stepanyan, V, Stibunov, V, Sulkosky, S, Tajima, W A, Tobias, J M, Udias, G M, Urciuoli, B, Vlahovic, H, Voskanyan, K, Wang, F R, Wesselmann, J R, Vignote, S A, Wood, J, Wright, H, Yao, and X, Zhu

Abstract

The electric form factor of the neutron was determined from studies of the reaction 3He(e,e'n)pp in quasielastic kinematics in Hall A at Jefferson Lab. Longitudinally polarized electrons were scattered off a polarized target in which the nuclear polarization was oriented perpendicular to the momentum transfer. The scattered electrons were detected in a magnetic spectrometer in coincidence with neutrons that were registered in a large-solid-angle detector. More than doubling the Q2 range over which it is known, we find G(E)(n)=0.0236±0.0017(stat)±0.0026(syst), 0.0208±0.0024±0.0019, and 0.0147±0.0020±0.0014 for Q(2)=1.72, 2.48, and 3.41 GeV2, respectively.

Published
2010

39. Recoil polarization measurements of the proton electromagnetic form factor ratio to Q2 = 8.5 GeV2

Author

A J R, Puckett, E J, Brash, M K, Jones, W, Luo, M, Meziane, L, Pentchev, C F, Perdrisat, V, Punjabi, F R, Wesselmann, A, Ahmidouch, I, Albayrak, K A, Aniol, J, Arrington, A, Asaturyan, H, Baghdasaryan, F, Benmokhtar, W, Bertozzi, L, Bimbot, P, Bosted, W, Boeglin, C, Butuceanu, P, Carter, S, Chernenko, E, Christy, M, Commisso, J C, Cornejo, S, Covrig, S, Danagoulian, A, Daniel, A, Davidenko, D, Day, S, Dhamija, D, Dutta, R, Ent, S, Frullani, H, Fenker, E, Frlez, F, Garibaldi, D, Gaskell, S, Gilad, R, Gilman, Y, Goncharenko, K, Hafidi, D, Hamilton, D W, Higinbotham, W, Hinton, T, Horn, B, Hu, J, Huang, G M, Huber, E, Jensen, C, Keppel, M, Khandaker, P, King, D, Kirillov, M, Kohl, V, Kravtsov, G, Kumbartzki, Y, Li, V, Mamyan, D J, Margaziotis, A, Marsh, Y, Matulenko, J, Maxwell, G, Mbianda, D, Meekins, Y, Melnik, J, Miller, A, Mkrtchyan, H, Mkrtchyan, B, Moffit, O, Moreno, J, Mulholland, A, Narayan, S, Nedev, Nuruzzaman, E, Piasetzky, W, Pierce, N M, Piskunov, Y, Prok, R D, Ransome, D S, Razin, P, Reimer, J, Reinhold, O, Rondon, M, Shabestari, A, Shahinyan, K, Shestermanov, S, Sirca, I, Sitnik, L, Smykov, G, Smith, L, Solovyev, P, Solvignon, R, Subedi, E, Tomasi-Gustafsson, A, Vasiliev, M, Veilleux, B B, Wojtsekhowski, S, Wood, Z, Ye, Y, Zanevsky, X, Zhang, Y, Zhang, X, Zheng, and L, Zhu

Abstract

Among the most fundamental observables of nucleon structure, electromagnetic form factors are a crucial benchmark for modern calculations describing the strong interaction dynamics of the nucleon's quark constituents; indeed, recent proton data have attracted intense theoretical interest. In this Letter, we report new measurements of the proton electromagnetic form factor ratio using the recoil polarization method, at momentum transfers Q2=5.2, 6.7, and 8.5 GeV2. By extending the range of Q2 for which G(E)(p) is accurately determined by more than 50%, these measurements will provide significant constraints on models of nucleon structure in the nonperturbative regime.

Published
2010

40. Searching for a U-boson with a positron beam

Author

B. Wojtsekhowski, Latifa Elouadrhiri, Jospeh Grames, Wally Melnitchouk, Eric Voutier, and Tony A. Forest

Subjects
Nuclear physics, Coupling constant, Physics, Antiparticle, Positron, Signal-to-noise ratio, Antimatter, Electron, Lepton, Boson
Abstract

A high sensitivity search for a light U-boson by means of a positron beam incident on a hydrogen target is proposed. We described a concept of the experiment and two possible realizations. The projected result of this experiment corresponds to an upper limit on the square of coupling constant |feU|2 = 3×10−9 with a signal to noise ratio of five.

Published
2009
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41. High-resolution spectroscopy of Lambda16N by electroproduction

Author

F, Cusanno, G M, Urciuoli, A, Acha, P, Ambrozewicz, K A, Aniol, P, Baturin, P Y, Bertin, H, Benaoum, K I, Blomqvist, W U, Boeglin, H, Breuer, P, Brindza, P, Bydzovský, A, Camsonne, C C, Chang, J-P, Chen, Seonho, Choi, E A, Chudakov, E, Cisbani, S, Colilli, L, Coman, B J, Craver, G, De Cataldo, C W, de Jager, R, De Leo, A P, Deur, C, Ferdi, R J, Feuerbach, E, Folts, R, Fratoni, S, Frullani, F, Garibaldi, O, Gayou, F, Giuliani, J, Gomez, M, Gricia, J O, Hansen, D, Hayes, D W, Higinbotham, T K, Holmstrom, C E, Hyde, H F, Ibrahim, M, Iodice, X, Jiang, L J, Kaufman, K, Kino, B, Kross, L, Lagamba, J J, LeRose, R A, Lindgren, M, Lucentini, D J, Margaziotis, P, Markowitz, S, Marrone, Z E, Meziani, K, McCormick, R W, Michaels, D J, Millener, T, Miyoshi, B, Moffit, P A, Monaghan, M, Moteabbed, C, Muñoz Camacho, S, Nanda, E, Nappi, V V, Nelyubin, B E, Norum, Y, Okasyasu, K D, Paschke, C F, Perdrisat, E, Piasetzky, V A, Punjabi, Y, Qiang, B, Raue, P E, Reimer, J, Reinhold, B, Reitz, R E, Roche, V M, Rodriguez, A, Saha, F, Santavenere, A J, Sarty, J, Segal, A, Shahinyan, J, Singh, S, Sirca, R, Snyder, P H, Solvignon, M, Sotona, R, Subedi, V A, Sulkosky, T, Suzuki, H, Ueno, P E, Ulmer, P, Veneroni, E, Voutier, B B, Wojtsekhowski, X, Zheng, and C, Zorn

Abstract

An experimental study of the (16)O(e,e'K(+))(Lambda)(16)N reaction has been performed at Jefferson Lab. A thin film of falling water was used as a target. This permitted a simultaneous measurement of the p(e,e'K(+))Lambda, Sigma(0) exclusive reactions and a precise calibration of the energy scale. A ground-state binding energy of 13.76+/-0.16 MeV was obtained for (Lambda)(16)N with better precision than previous measurements on the mirror hypernucleus (Lambda)(16)O. Precise energies have been determined for peaks arising from a Lambda in s and p orbits coupled to the p(1/2) and p(3/2) hole states of the (15)N core nucleus.

Published
2008

43. Nucleon Form Factors experiments with 12 GeV CEBAF

Author

B. Wojtsekhowski, Sigfrido Boffi, Claudio Ciofi degli Atti, Mauro Giannini, and Daniele Treleani

Subjects
Quantum chromodynamics, Nuclear physics, Physics, Particle physics, Momentum transfer, Quark–gluon plasma, Quark model, Form factor (quantum field theory), Nuclear Experiment, Deep inelastic scattering, Nucleon, High momentum
Abstract

A number of precision form factor experiments at high momentum transfer will be performed with the 11 GeV electron beam of CEBAF. We review the approved proposals and the conceptual schemes of several new suggestions. Form factor data will serve as a major input for the construction of a tomographic image of the nucleon.

Published
2008
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44. Measurements of the Proton Elastic-Form-Factor RatioμpGEp/GMpat Low Momentum Transfer

Author

G. Ron, J. Glister, B. Lee, K. Allada, W. Armstrong, J. Arrington, A. Beck, F. Benmokhtar, B. L. Berman, W. Boeglin, E. Brash, A. Camsonne, J. Calarco, J. P. Chen, Seonho Choi, E. Chudakov, L. Coman, B. Craver, F. Cusanno, J. Dumas, C. Dutta, R. Feuerbach, A. Freyberger, S. Frullani, F. Garibaldi, R. Gilman, O. Hansen, D. W. Higinbotham, T. Holmstrom, C. E. Hyde, H. Ibrahim, Y. Ilieva, C. W. de Jager, X. Jiang, M. K. Jones, H. Kang, A. Kelleher, E. Khrosinkova, E. Kuchina, G. Kumbartzki, J. J. LeRose, R. Lindgren, P. Markowitz, S. May-Tal Beck, E. McCullough, D. Meekins, M. Meziane, Z.-E. Meziani, R. Michaels, B. Moffit, B. E. Norum, Y. Oh, M. Olson, M. Paolone, K. Paschke, C. F. Perdrisat, E. Piasetzky, M. Potokar, R. Pomatsalyuk, I. Pomerantz, A. Puckett, V. Punjabi, X. Qian, Y. Qiang, R. Ransome, M. Reyhan, J. Roche, Y. Rousseau, A. Saha, A. J. Sarty, B. Sawatzky, E. Schulte, M. Shabestari, A. Shahinyan, R. Shneor, S. Širca, K. Slifer, P. Solvignon, J. Song, R. Sparks, R. Subedi, S. Strauch, G. M. Urciuoli, K. Wang, B. Wojtsekhowski, X. Yan, H. Yao, X. Zhan, and X. Zhu

Subjects
Physics, Proton, 010308 nuclear & particles physics, Hadron, Momentum transfer, Form factor (quantum field theory), General Physics and Astronomy, Elementary particle, 01 natural sciences, Baryon, 0103 physical sciences, Atomic physics, 010306 general physics, Nucleon, Dimensionless quantity
Abstract

High-precision measurements of the proton elastic form-factor ratio, {mu}{sub p}G{sub E}{sup p}/G{sub M}{sup p}, have been made at four-momentum transfer, Q{sup 2}, values between 0.2 and 0.5 GeV{sup 2}. The new data, while consistent with previous results, clearly show a ratio less than unity and significant differences from the central values of several recent phenomenological fits. By combining the new form-factor ratio data with an existing cross-section measurement, one finds that in this Q{sup 2} range the deviation from unity is primarily due to G{sub E}{sup p} being smaller than expected.

Published
2007
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45. Measurements of the proton elastic-form-factor ratio mu pG p E/G p M at low momentum transfer

Author

G, Ron, J, Glister, B, Lee, K, Allada, W, Armstrong, J, Arrington, A, Beck, F, Benmokhtar, B L, Berman, W, Boeglin, E, Brash, A, Camsonne, J, Calarco, J P, Chen, Seonho, Choi, E, Chudakov, L, Coman, B, Craver, F, Cusanno, J, Dumas, C, Dutta, R, Feuerbach, A, Freyberger, S, Frullani, F, Garibaldi, R, Gilman, O, Hansen, D W, Higinbotham, T, Holmstrom, C E, Hyde, H, Ibrahim, Y, Ilieva, C W, de Jager, X, Jiang, M K, Jones, H, Kang, A, Kelleher, E, Khrosinkova, E, Kuchina, G, Kumbartzki, J J, LeRose, R, Lindgren, P, Markowitz, S, May-Tal Beck, E, McCullough, D, Meekins, M, Meziane, Z-E, Meziani, R, Michaels, B, Moffit, B E, Norum, Y, Oh, M, Olson, M, Paolone, K, Paschke, C F, Perdrisat, E, Piasetzky, M, Potokar, R, Pomatsalyuk, I, Pomerantz, A, Puckett, V, Punjabi, X, Qian, Y, Qiang, R, Ransome, M, Reyhan, J, Roche, Y, Rousseau, A, Saha, A J, Sarty, B, Sawatzky, E, Schulte, M, Shabestari, A, Shahinyan, R, Shneor, S, Sirca, K, Slifer, P, Solvignon, J, Song, R, Sparks, R, Subedi, S, Strauch, G M, Urciuoli, K, Wang, B, Wojtsekhowski, X, Yan, H, Yao, X, Zhan, and X, Zhu

Abstract

High-precision measurements of the proton elastic form-factor ratio, mu pG p E/G p M, have been made at four-momentum transfer, Q2, values between 0.2 and 0.5 GeV2. The new data, while consistent with previous results, clearly show a ratio less than unity and significant differences from the central values of several recent phenomenological fits. By combining the new form-factor ratio data with an existing cross-section measurement, one finds that in this Q2 range the deviation from unity is primarily due to G p E being smaller than expected.

Published
2007

46. High resolution spectroscopy of (lambda)(12)B by electroproduction

Author

M, Iodice, F, Cusanno, A, Acha, P, Ambrozewicz, K A, Aniol, P, Baturin, P Y, Bertin, H, Benaoum, K I, Blomqvist, W U, Boeglin, H, Breuer, P, Brindza, P, Bydzovský, A, Camsonne, C C, Chang, J-P, Chen, Seonho, Choi, E A, Chudakov, E, Cisbani, S, Colilli, L, Coman, B J, Craver, G, De Cataldo, C W, de Jager, R, De Leo, A P, Deur, C, Ferdi, R J, Feuerbach, E, Folts, R, Fratoni, S, Frullani, F, Garibaldi, O, Gayou, F, Giulani, J, Gomez, M, Gricia, J O, Hansen, D, Hayes, D W, Higinbotham, T K, Holmstrom, C E, Hyde, H F, Ibrahim, X, Jiang, L J, Kaufman, K, Kino, B, Kross, L, Lagamba, J J, LeRose, R A, Lindgren, M, Lucentini, D J, Margaziotis, P, Markowitz, S, Marrone, Z E, Meziani, K, McCormick, R W, Michaels, D J, Millener, T, Miyoshi, B, Moffit, P A, Monaghan, M, Moteabbed, C, Muñoz Camacho, S, Nanda, E, Nappi, V V, Nelyubin, B E, Norum, Y, Okasyasu, K D, Paschke, C F, Perdrisat, E, Piasetzky, V A, Punjabi, Y, Qiang, B, Raue, P E, Reimer, J, Reinhold, B, Reitz, R E, Roche, V M, Rodriguez, A, Saha, F, Santavenere, A J, Sarty, J, Segal, A, Shahinyan, J, Singh, S, Sirca, R, Snyder, P H, Solvignon, M, Sotona, R, Subedi, V A, Sulkosky, T, Suzuki, H, Ueno, P E, Ulmer, G M, Urciuoli, P, Veneroni, E, Voutier, B B, Wojtsekhowski, Y, Ye, X, Zheng, S, Zhou, and C, Zorn

Abstract

An experiment measuring electroproduction of hypernuclei has been performed in hall A at Jefferson Lab on a 12C target. In order to increase counting rates and provide unambiguous kaon identification two superconducting septum magnets and a ring imaging Cherenkov detector were added to the hall A standard equipment. An unprecedented energy resolution of less than 700 keV FWHM has been achieved. Thus, the observed (Lambda)(12)B spectrum shows for the first time identifiable strength in the core-excited region between the ground-state s-wave Lambda peak and the 11 MeV p-wave Lambda peak.

Published
2007

47. Extraction of the neutron magnetic form factor from quasielastic3He→(e→,e') atQ2=0.1−0.6 (GeV/c)2

Author

B. Anderson, L. Auberbach, T. Averett, W. Bertozzi, T. Black, J. Calarco, L. Cardman, G. D. Cates, Z. W. Chai, J. P. Chen, Seonho Choi, E. Chudakov, S. Churchwell, G. S. Corrado, C. Crawford, D. Dale, A. Deur, P. Djawotho, D. Dutta, J. M. Finn, H. Gao, R. Gilman, A. V. Glamazdin, C. Glashausser, W. Glöckle, J. Golak, J. Gomez, V. G. Gorbenko, J.-O. Hansen, F. W. Hersman, D. W. Higinbotham, R. Holmes, C. R. Howell, E. Hughes, B. Humensky, S. Incerti, C. W. de Jager, J. S. Jensen, X. Jiang, C. E. Jones, M. Jones, R. Kahl, H. Kamada, A. Kievsky, I. Kominis, W. Korsch, K. Kramer, G. Kumbartzki, M. Kuss, E. Lakuriqi, M. Liang, N. Liyanage, J. LeRose, S. Malov, D. J. Margaziotis, J. W. Martin, K. McCormick, R. D. McKeown, K. McIlhany, Z.-E. Meziani, R. Michaels, G. W. Miller, J. Mitchell, S. Nanda, E. Pace, T. Pavlin, G. G. Petratos, R. I. Pomatsalyuk, D. Pripstein, D. Prout, R. D. Ransome, Y. Roblin, M. Rvachev, A. Saha, G. Salmè, M. Schnee, J. Seely, T. Shin, K. Slifer, P. A. Souder, S. Strauch, R. Suleiman, M. Sutter, B. Tipton, L. Todor, M. Viviani, B. Vlahovic, J. Watson, C. F. Williamson, H. Witała, B. Wojtsekhowski, F. Xiong, W. Xu, J. Yeh, and P. Żołnierczuk

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Nuclear Theory, Hadron, Plane wave, Elementary particle, 01 natural sciences, 7. Clean energy, Nuclear physics, Helium-3, 0103 physical sciences, Magnetic form factor, Neutron, Nuclear Experiment, 010306 general physics, Nucleon, Isotopes of helium
Abstract

We have measured the transverse asymmetry A{sub T{sup '}} in the quasielastic {sup 3}He-vector(e-vector,e{sup '}) process with high precision at Q{sup 2} values from 0.1 to 0.6 (GeV/c){sup 2}. The neutron magnetic form factor G{sub M}{sup n} was extracted at Q{sup 2} values of 0.1 and 0.2 (GeV/c){sup 2} using a nonrelativistic Faddeev calculation which includes both final-state interactions (FSI) and meson-exchange currents (MEC). Theoretical uncertainties due to the FSI and MEC effects were constrained with a precision measurement of the spin-dependent asymmetry in the threshold region of {sup 3}He-vector(e-vector,e{sup '}). We also extracted the neutron magnetic form factor G{sub M}{sup n} at Q{sup 2} values of 0.3 to 0.6 (GeV/c){sup 2} based on plane wave impulse approximation calculations.

Published
2007
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48. Precision measurements of the nucleon strange form factors at Q2 approximately 0.1 GeV2

Author

A, Acha, K A, Aniol, D S, Armstrong, J, Arrington, T, Averett, S L, Bailey, J, Barber, A, Beck, H, Benaoum, J, Benesch, P Y, Bertin, P, Bosted, F, Butaru, E, Burtin, G D, Cates, Y-C, Chao, J-P, Chen, E, Chudakov, E, Cisbani, B, Craver, F, Cusanno, R, De Leo, P, Decowski, A, Deur, R J, Feuerbach, J M, Finn, S, Frullani, S A, Fuchs, K, Fuoti, R, Gilman, L E, Glesener, K, Grimm, J M, Grames, J O, Hansen, J, Hansknecht, D W, Higinbotham, R, Holmes, T, Holmstrom, H, Ibrahim, C W, de Jager, X, Jiang, J, Katich, L J, Kaufman, A, Kelleher, P M, King, A, Kolarkar, S, Kowalski, E, Kuchina, K S, Kumar, L, Lagamba, P, LaViolette, J, LeRose, R A, Lindgren, D, Lhuillier, N, Liyanage, D J, Margaziotis, P, Markowitz, D G, Meekins, Z-E, Meziani, R, Michaels, B, Moffit, S, Nanda, V, Nelyubin, K, Otis, K D, Paschke, S K, Phillips, M, Poelker, R, Pomatsalyuk, M, Potokar, Y, Prok, A, Puckett, X, Qian, Y, Qiang, B, Reitz, J, Roche, A, Saha, B, Sawatzky, J, Singh, K, Slifer, S, Sirca, R, Snyder, P, Solvignon, P A, Souder, M L, Stutzman, R, Subedi, R, Suleiman, V, Sulkosky, W A, Tobias, P E, Ulmer, G M, Urciuoli, K, Wang, A, Whitbeck, R, Wilson, B, Wojtsekhowski, H, Yao, Y, Ye, X, Zhan, X, Zheng, S, Zhou, and V, Ziskin

Abstract

We report new measurements of the parity-violating asymmetry A(PV) in elastic scattering of 3 GeV electrons off hydrogen and 4He targets withtheta(lab)approximately 6.0 degrees . The 4He result is A(PV)=(+6.40+/-0.23(stat)+/-0.12(syst))x10(-6). The hydrogen result is A(PV)=(-1.58+/-0.12(stat)+/-0.04(syst))x10(-6). These results significantly improve constraints on the electric and magnetic strange form factors G(E)(s) and G(M)(s). We extract G(E)(s)=0.002+/-0.014+/-0.007 atQ(2)=0.077 GeV2, and G(E)(s)+0.09G(M)(s)=0.007+/-0.011+/-0.006 atQ(2)=0.109 GeV2, providing new limits on the role of strange quarks in the nucleon charge and magnetization distributions.

Published
2006

49. Parity-Violating Electron Scattering fromHe4and the Strange Electric Form Factor of the Nucleon

Author

K. A. Aniol, D. S. Armstrong, T. Averett, H. Benaoum, P. Y. Bertin, E. Burtin, J. Cahoon, G. D. Cates, C. C. Chang, Y.-C. Chao, J.-P. Chen, Seonho Choi, E. Chudakov, B. Craver, F. Cusanno, P. Decowski, D. Deepa, C. Ferdi, R. J. Feuerbach, J. M. Finn, S. Frullani, K. Fuoti, F. Garibaldi, R. Gilman, A. Glamazdin, V. Gorbenko, J. M. Grames, J. Hansknecht, D. W. Higinbotham, R. Holmes, T. Holmstrom, T. B. Humensky, H. Ibrahim, C. W. de Jager, X. Jiang, L. J. Kaufman, A. Kelleher, A. Kolarkar, S. Kowalski, K. S. Kumar, D. Lambert, P. LaViolette, J. LeRose, D. Lhuillier, N. Liyanage, D. J. Margaziotis, M. Mazouz, K. McCormick, D. G. Meekins, Z.-E. Meziani, R. Michaels, B. Moffit, P. Monaghan, C. Munoz-Camacho, S. Nanda, V. Nelyubin, D. Neyret, K. D. Paschke, M. Poelker, R. Pomatsalyuk, Y. Qiang, B. Reitz, J. Roche, A. Saha, J. Singh, R. Snyder, P. A. Souder, R. Subedi, R. Suleiman, V. Sulkosky, W. A. Tobias, G. M. Urciuoli, A. Vacheret, E. Voutier, K. Wang, R. Wilson, B. Wojtsekhowski, and X. Zheng

Subjects
Physics, Quark, Particle physics, Magnetic moment, Neutral current, 010308 nuclear & particles physics, Scattering, media_common.quotation_subject, Electroweak interaction, General Physics and Astronomy, 01 natural sciences, Asymmetry, Proton scattering, 0103 physical sciences, 010306 general physics, Parity (mathematics), media_common
Published
2006
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50. A simple method to increase effective PMT gain by amplifier circuit powered from voltage divider

Author

S. Majewski, D. Guerin, Vladimir Popov, and B. Wojtsekhowski

Subjects
Photomultiplier, Engineering, business.industry, Amplifier, Voltage divider, Electronic engineering, Electrical engineering, Dynode, business, Signal, Signal conditioning, Line (electrical engineering), Voltage
Abstract

A novel concept is introduced of additional effective signal amplification by employing a dedicated circuit to process anode or dynode signals prior to sending them through a standard 50 /spl Omega/ line/cable. The circuit is entirely powered by the current flowing through the base voltage divider. Additional gain factors of 2-10 were easily achieved with preserved operation speed and rate capability up to several MHz. This additional signal boost can be used in many applications where higher gain and/or lower PMT operational voltages are desirable. For example, in the case of a PMT employed in a low input light signal (such as a Cherenkov counter), this technique will permit operation at a lower voltage and, therefore, will result in better operational PMT stability and longer PMT lifetime. At present, two experimental set-ups at Jefferson Lab are using PMT bases using this concept.

Published
2005
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