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1. Precision Electron-Beam Polarimetry at 1 GeV Using Diamond Microstrip Detectors

Author

A. Narayan, D. Jones, J. C. Cornejo, M. M. Dalton, W. Deconinck, D. Dutta, D. Gaskell, J. W. Martin, K. D. Paschke, V. Tvaskis, A. Asaturyan, J. Benesch, G. Cates, B. S. Cavness, L. A. Dillon-Townes, G. Hays, E. Ihloff, R. Jones, P. M. King, S. Kowalski, L. Kurchaninov, L. Lee, A. McCreary, M. McDonald, A. Micherdzinska, A. Mkrtchyan, H. Mkrtchyan, V. Nelyubin, S. Page, W. D. Ramsay, P. Solvignon, D. Storey, A. Tobias, E. Urban, C. Vidal, B. Waidyawansa, P. Wang, and S. Zhamkotchyan

Subjects
Physics, QC1-999
Abstract

We report on the highest precision yet achieved in the measurement of the polarization of a low-energy, O(1 GeV), continuous-wave (CW) electron beam, accomplished using a new polarimeter based on electron-photon scattering, in Hall C at Jefferson Lab. A number of technical innovations were necessary, including a novel method for precise control of the laser polarization in a cavity and a novel diamond microstrip detector that was able to capture most of the spectrum of scattered electrons. The data analysis technique exploited track finding, the high granularity of the detector, and its large acceptance. The polarization of the 180-μA, 1.16-GeV electron beam was measured with a statistical precision of

Published
2016
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2. Deep Exclusive Electroproduction of π0 at High Q2 in the Quark Valence Regime

Author

N. H. Saylor, D. Bulumulla, Wouter Deconinck, E. Pooser, L. Ye, B. Crowe, Weidong Li, B. P. Quinn, Y. Huang, Douglas Higinbotham, E. Fuchey, C. Ayerbe Gayoso, Y. Zhao, S. A. Wood, M. K. Jones, Darko Androić, Jie Liu, A. J. Sarty, Z. Ye, K. Hamilton, E. McClellan, M. E. Christy, A. Liyanage, J. Bane, F. Georges, O. F. Obretch, C. Gal, S. F. Ali, Bogdan Wojtsekhowski, P. M. King, C. Palatchi, F. Hauenstein, J. Roche, T. Averett, P. E. Reimer, J. P. Chen, G. M. Urciuoli, Franco Meddi, M. H. Shabestari, C. Fanelli, K. A. Aniol, R. I. Pomatsalyuk, B. Aljawrneh, Shams Rahman, C. E. Hyde, R. Beminiwattha, X. Yan, Andrew Puckett, E. Voutier, E. Cisbani, S. J. Nazeer, Chunhui Chen, C. Desnault, M. Carmignotto, O. Glamazdin, J. Castellano, Z. Ahmed, L. Ou, F. De Persio, Olfred Hansen, S. Allison, J. R. M. Annand, Simon Širca, T. Gautam, D. Nguyen, B. Sawatzky, G. M. Huber, S. Danagoulian, J. C. Cornejo, Tanja Horn, C. M. Jen, F. Tortorici, T. Su, S. Alsalmi, Yicheng Wang, G. Hamad, B. Duran, Kalyan Allada, Maxime Defurne, R. Michaels, Hongjun Liu, D. Gaskell, Juliette Mammei, David Hamilton, Pete Markowitz, L. A. Thorne, E. J. Brash, V. M. Gray, C. Munoz Camacho, D. Adikaram, T. W. Danley, Y. Tian, K. Park, Ping Zhu, L. S. Myers, M. N. H. Rashad, Rolf Ent, R. A. Montgomery, D. Biswas, S. Malace, W. Henry, A. Sun, M. Dlamini, H. Atac, N. Israel, R. Trotta, X. Bai, V. Bellini, N. Ton, R. Spies, Alexandre Camsonne, A. Stefanko, C. Gu, K. Bartlett, K. Jin, B. A. Clary, Kondo Gnanvo, M. Nycz, T. Holmstrom, P.-J. Lin, Shanfeng Li, C. Yero, T. Hague, Taya Chetry, Jie Zhang, J. Bericic, J. Campbell, A. Mkrtchyan, Nikos Sparveris, K. Mesik, I. Sapkota, Vladimir Nelyubin, A. Shahinyan, N. Compton, D. Di, Eliahu Cohen, S. Sooriyaarachchilage, Cynthia Keppel, H. S. Ko, A. Kabir, V. A. Punjabi, D. G. Meekins, S. Barcus, V. Khachatryan, G. B. Franklin, P. Nadel-Turonski, N. Nuruzzaman, Chao Peng, G. R. Smith, H. F. Ibrahim, B. Karki, M. Duer, H. Albataineh, A. Subedi, S. Park, B. Schmookler, B. Pandey, Vincent Sulkosky, J. A. Magee, B. Waidyawansa, and S. Covrig Dusa

Subjects
Quark, Physics, Particle physics, 010308 nuclear & particles physics, Momentum transfer, General Physics and Astronomy, Sigma, Virtual particle, Parton, 01 natural sciences, Helicity, Pion, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

We report measurements of the exclusive neutral pion electroproduction cross section off protons at large values of $x_B$ (0.36, 0.48 and 0.60) and $Q^2$ (3.1 to 8.4 GeV$^2$) obtained from Jefferson Lab Hall A experiment E12-06-014. The corresponding structure functions $d\sigma_L/dt+\epsilon d\sigma_T/dt$, $d\sigma_{TT}/dt$, $d\sigma_{LT}/dt$ and $d\sigma_{LT'}/dt$ are extracted as a function of the proton momentum transfer $t-t_{min}$. The results suggest the amplitude for transversely polarized virtual photons continues to dominate the cross-section throughout this kinematic range. The data are well described by calculations based on transversity Generalized Parton Distributions coupled to a helicity flip Distribution Amplitude of the pion, thus providing a unique way to probe the structure of the nucleon.

Published
2021

3. Measurement of the beam-normal single-spin asymmetry for elastic electron scattering from C12 and Al27

Author

R. W. Radloff, S. A. Page, John M. Finn, L. Lee, V. Tvaskis, L. Z. Ndukum, K. E. Mesick, S. Kowalski, Jongmin Lee, W. S. Duvall, A. Mkrtchyan, A. R. Lee, C. A. Davis, P. Solvignon, William A. Tobias, J. Leacock, Jay Benesch, J. A. Dunne, F. Guo, H. Mkrtchyan, M. M. Dalton, R. D. Carlini, B. Sawatzky, S. MacEwan, T. Seva, W. D. Ramsay, E. Korkmaz, D. G. Meekins, Kent Paschke, P. M. King, V. M. Gray, V. Tadevosyan, D. C. Jones, J. C. Cornejo, Jean-Francois Rajotte, J. Pan, M. H. Shabestari, P. Wang, J. A. Magee, R. S. Beminiwattha, Michael Gericke, R. Michaels, Fatiha Benmokhtar, Wouter Deconinck, B. Waidyawansa, D. S. Armstrong, Jonathan W. Martin, R. Subedi, S. Covrig Dusa, M. Kargiantoulakis, J. Leckey, Dipanwita Dutta, S. P. Wells, W. R. Falk, S. A. Wood, P. Zang, Darko Androić, D. T. Spayde, Vladimir Nelyubin, D. J. Mack, S. Zhamkochyan, M. E. Christy, A. Asaturyan, R. Silwal, J. F. Dowd, S. K. Phillips, T. A. Forest, J. Birchall, M. Elaasar, Geoffrey Smith, A. Subedi, R. Mahurin, M. J. McHugh, Riad Suleiman, Michael Pitt, Amrendra Narayan, D. Gaskell, V. Owen, C. Gal, W. T. H. van Oers, Nuruzzaman, J. R. Hoskins, Juliette Mammei, K. Bartlett, J. Roche, and Neven Simicevic

Subjects
Elastic scattering, Physics, Range (particle radiation), 010308 nuclear & particles physics, Scattering, media_common.quotation_subject, 01 natural sciences, Asymmetry, Nuclear physics, Momentum, Transverse plane, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Beam (structure), Spin-½, media_common
Abstract

We report measurements of the parity-conserving beam-normal single-spin elastic scattering asymmetries $B_n$ on $^{12}$C and $^{27}$Al, obtained with an electron beam polarized transverse to its momentum direction. These measurements add an additional kinematic point to a series of previous measurements of $B_n$ on $^{12}$C and provide a first measurement on $^{27}$Al. The experiment utilized the Qweak apparatus at Jefferson Lab with a beam energy of 1.158 GeV. The average lab scattering angle for both targets was 7.7 degrees, and the average $Q^2$ for both targets was 0.02437 GeV$^2$ (Q=0.1561 GeV). The asymmetries are $B_n$ = -10.68 $\pm$ 0.90 stat) $\pm$ 0.57 (syst) ppm for $^{12}$C and $B_n$ = -12.16 $\pm$ 0.58 (stat) $\pm$ 0.62 (syst) ppm for $^{27}$Al. The results are consistent with theoretical predictions, and are compared to existing data. When scaled by Z/A, the Q-dependence of all the far-forward angle (theta < 10 degrees) data from $^{1}$H to $^{27}$Al can be described by the same slope out to $Q \approx 0.35$ GeV. Larger-angle data from other experiments in the same Q range are consistent with a slope about twice as steep.

Published
2021

4. Technical supplement to 'Polarization transfer observables in elastic electron-proton scattering at Q2=2.5,5.2,6.8 and 8.5GeV2'

Author

H. C. Fenker, Michael Kohl, S. Nedev, P. Carter, S. Covrig, Rolf Ent, A. Shahinyan, Joerg Reinhold, S. Dhamija, Y. Prok, X. Zhang, Bi-Tao Hu, L. Bimbot, H. Baghdasaryan, P. E. Reimer, V. Kravtsov, Salvatore Frullani, William Bertozzi, W. Luo, Franco Garibaldi, S. Širca, Lubomir Pentchev, G. M. Huber, Nuruzzaman, A. Mkrtchyan, L. Solovyev, R. Subedi, David Hamilton, Yu.V. Zanevsky, V. Mamyan, Z. Ye, D. J. Margaziotis, Y. Zhang, M. H. Shabestari, Bogdan Wojtsekhowski, C. F. Perdrisat, G. J. Kumbartzki, Ronald Ransome, M. Khandaker, G. Mbianda, H. Mkrtchyan, J. C. Cornejo, M. E. Christy, P. Bosted, A. Ahmidouch, Y. Goncharenko, C. E. Keppel, I. Sitnik, D. S. Razin, Dipangkar Dutta, V. A. Punjabi, Donal Day, Andrey Vasiliev, A. Marsh, D. G. Meekins, Emil Frlez, E. Piasetzky, W. U. Boeglin, A. Asaturyan, J. Arrington, J. Mulholland, I. Albayrak, L. Zhu, O. Moreno, P. Solvignon, K. Hafidi, O. Rondon, S. Danagoulian, B. Moffit, P. M. King, W. Hinton, M. Meziane, S. A. Wood, M. Veilleux, J. Huang, G. R. Smith, E. Tomasi-Gustafsson, Shalev Gilad, K. A. Aniol, Y. Li, T. Horn, L. Smykov, S. P. Chernenko, C. Butuceanu, James A. Miller, Amrendra Narayan, D. Gaskell, Douglas Higinbotham, M. K. Jones, N. M. Piskunov, E. Jensen, James Maxwell, W. Pierce, Fatiha Benmokhtar, X. Zheng, Andrew Puckett, Y. Matulenko, Ronald Gilman, F. R. Wesselmann, Andrei Afanasev, A. Davidenko, Di. Kirillov, Yu.M. Mel'nik, A. Daniel, E. J. Brash, and K. Shestermanov

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Elastic electron, Observable, Technical note, Polarization (waves), 01 natural sciences, Nuclear physics, Electromagnetic calorimeter, Proton scattering, 0103 physical sciences, Born approximation, 010306 general physics, Instrumentation, Mathematical physics
Abstract

Author(s): Puckett, AJR; Brash, EJ; Jones, MK; Luo, W; Meziane, M; Pentchev, L; Perdrisat, CF; Punjabi, V; Wesselmann, FR; Afanasev, A; Ahmidouch, A; Albayrak, I; Aniol, KA; Arrington, J; Asaturyan, A; Baghdasaryan, H; Benmokhtar, F; Bertozzi, W; Bimbot, L; Bosted, P; Boeglin, W; Butuceanu, C; Carter, P; Chernenko, S; Christy, ME; Cornejo, JC; Covrig, S; Danagoulian, S; Daniel, A; Davidenko, A; Day, D; Dhamija, S; Dutta, D; Ent, R; Frullani, S; Fenker, H; Frlez, E; Garibaldi, F; Gaskell, D; Gilad, S; Gilman, R; Goncharenko, Y; Hafidi, K; Hamilton, D; Higinbotham, DW; Hinton, W; Horn, T; Hu, B; Huang, J; Huber, GM; Jensen, E; Keppel, C; Khandaker, M; King, P; Kirillov, D; Kohl, M; Kravtsov, V; Kumbartzki, G; Li, Y; Mamyan, V; Margaziotis, DJ; Marsh, A; Matulenko, Y; Maxwell, J; Mbianda, G; Meekins, D; Melnik, Y; Miller, J; Mkrtchyan, A; Mkrtchyan, H; Moffit, B; Moreno, O; Mulholland, J; Narayan, A; Nedev, S; Nuruzzaman; Piasetzky, E; Pierce, W; Piskunov, NM; Prok, Y; Ransome, RD; Razin, DS; Reimer, P; Reinhold, J; Rondon, O | Abstract: The GEp-III and GEp-2γ experiments, carried out in Jefferson Lab's Hall C from 2007–2008, consisted of measurements of polarization transfer in elastic electron–proton scattering at momentum transfers of Q2=2.5,5.2,6.8, and 8.54 GeV 2. These measurements were carried out to improve knowledge of the proton electromagnetic form factor ratio R=μpGEp∕GMp at large values of Q2 and to search for effects beyond the Born approximation in polarization transfer observables at Q2=2.5GeV2. The final results of both experiments were reported in a recent archival publication. A full reanalysis of the data from both experiments was carried out in order to reduce the systematic and, for the GEp-2γ experiment, statistical uncertainties. This technical note provides additional details of the final analysis omitted from the main publication, including the final evaluation of the systematic uncertainties.

Published
2018

5. Accurate Determination of the Neutron Skin Thickness of Pb208 through Parity-Violation in Electron Scattering

Author

S. Rahman, H. Albataineh, B. Yale, K. S. Kumar, S. Seeds, A. Deshpande, C. Ayerbe Gayoso, A. Yoon, Q. Campagna, G. M. Urciuoli, G. Leverick, R. Mammei, Bogdan Wojtsekhowski, D. S. Armstrong, Paul Souder, Siyu Jian, C. Palatchi, S. Johnston, C. Jantzi, H. Bhatt, P. E. Reimer, B. Karki, Dipangkar Dutta, T. Ye, D. King, D. McNulty, M. Knauss, L. G. Tang, J. C. Cornejo, T. Gautam, S. Katugampola, P. M. King, R. W. Radloff, H. Liu, J. O. Hansen, J. Pan, D. C. Jones, Michael Pitt, S. Riordan, E. W. Wertz, S. Park, R. Michaels, Y. Tian, C. Metts, M. N. H. Rashad, P. Datta, S. Premathilake, S. Malace, W. Zhang, S. Covrig Dusa, Y. Roblin, I. Halilovic, K. A. Aniol, T. Averett, S. Barcus, C. Feldman, N. Liyange, B. Pandey, A. Zec, E. Fuchey, Charles Horowitz, Jay Benesch, Michaela Thiel, Kent Paschke, A. Narayan, C. Ghosh, D. Adhikari, Brendan Reed, B. P. Quinn, Jiawen Zhang, F. Hauenstein, Cynthia Keppel, M. Petrusky, Darko Androić, G. D. Cates, D. G. Meekins, R. Richards, V. Bellini, N. Lashley-Colthirst, A. Rathnayake, M. M. Mondal, X. Zheng, Michael Gericke, M. McCaughan, Andrew Puckett, Juliette Mammei, A. Camsonne, A. Shahinyan, B. Blaikie, C. Clarke, D. Gaskell, Y. Chen, Jim Napolitano, V. Owen, C. Gal, D. Nikolaev, D. Bhetuwal, R. S. Beminiwattha, W. Henry, T. Kutz, and D. Bhatta Pathak

Subjects
Elastic scattering, Physics, Equation of state (cosmology), media_common.quotation_subject, Form factor (quantum field theory), General Physics and Astronomy, 01 natural sciences, Asymmetry, 0103 physical sciences, Saturation (graph theory), Neutron, Atomic physics, 010306 general physics, Electron scattering, Energy (signal processing), media_common
Abstract

We report a precision measurement of the parity-violating asymmetry A_{PV} in the elastic scattering of longitudinally polarized electrons from ^{208}Pb. We measure A_{PV}=550±16(stat)±8(syst) parts per billion, leading to an extraction of the neutral weak form factor F_{W}(Q^{2}=0.00616 GeV^{2})=0.368±0.013. Combined with our previous measurement, the extracted neutron skin thickness is R_{n}-R_{p}=0.283±0.071 fm. The result also yields the first significant direct measurement of the interior weak density of ^{208}Pb: ρ_{W}^{0}=-0.0796±0.0036(exp)±0.0013(theo) fm^{-3} leading to the interior baryon density ρ_{b}^{0}=0.1480±0.0036(exp)±0.0013(theo) fm^{-3}. The measurement accurately constrains the density dependence of the symmetry energy of nuclear matter near saturation density, with implications for the size and composition of neutron stars.

Published
2021

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

Author

Wolfgang Korsch, P.Y. Bertin, A. Shabetai, N. Kolb, Pete Markowitz, Houbing Lu, T.B. Humensky, K. Kramer, R. Roche, Z. E. Meziani, R. De Leo, Antonin Vacheret, Ronald Ransome, Jaideep Singh, R. J. Feuerbach, M. Iodice, F. Garibaldi, W. U. Boeglin, Nilanga Liyanage, L. J. Kaufman, X. Zhan, J. Yuan, J. Gomez, L. Zhu, R. Stringer, L. Wan, Seung-Tae Woo, H. F. Ibrahim, D. Hayes, L. Lagamba, J. Niedziela, Ronald Pandolfi, Douglas Higinbotham, A.J.R. Puckett, S. Dhamija, K. McCormick, S. L. Bailey, Bogdan Wojtsekhowski, J. P. Chen, V. Laine, E. Chudakov, X. Zheng, S. Frullani, P. Monaghan, S. K. Nanda, B. Craver, Yujie Qiang, G. J. Kumbartzki, D. S. Armstrong, J. O. Hansen, P. E. Ulmer, N. Ton, K. E. Keister, G. Laveissière, J. M. Finn, Simon Širca, B. Ma, K. Wang, B. Hersman, R. A. Lindgren, J. J. LeRose, M. Niskin, A. Saha, A. Kelleher, Karl Slifer, V. Sulkosky, F. Cusanno, Seonho Choi, S. Abrahamyan, Ronald Gilman, A. Deur, A. V. Glamazdin, A. Camsonne, D. Lhuillier, J. C. Cornejo, P. Solvignon, R. Subedi, A. Kolarkar, A. Beck, T. Averett, C. E. Hyde, Kent Paschke, Charles Glashausser, V. A. Punjabi, W. Kim, Haiyan Gao, E. Voutier, M. Potokar, L. Coman, J. D. Denton, B. Reitz, C. C. Chang, Olivier Gayou, K. Fuoti, X. Jiang, D. J. Margaziotis, C. Peng, H. Yao, G. D. Cates, William A. Tobias, R. Snyder, G. M. Urciuoli, C. W. de Jager, K. A. Aniol, Bryan J. Moffit, T. Holmstrom, M. Meziane, F. Butaru, R. Michaels, 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), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Jefferson Lab E97-110, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne (UCA)-Centre National de la Recherche Scientifique (CNRS), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), and E97-110

Subjects
Nuclear and High Energy Physics, n: polarization, Electron, structure function: spin, Spin structure, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], spin: dependence, 01 natural sciences, High Energy Physics - Experiment, 0103 physical sciences, Effective field theory, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Neutron, helium: polarization, 010306 general physics, Nuclear Experiment, Spin-½, Physics, Quantum chromodynamics, 010308 nuclear & particles physics, deuteron: structure function, cross section: difference, Resonance, Observable, perturbation theory: chiral, lcsh:QC1-999, sum rule: spin, Atomic physics, spin: asymmetry, lcsh:Physics, experimental results, Jefferson Lab
Abstract

The spin-structure functions $g_1$ and $g_2$, and the spin-dependent partial cross-section $\sigma_\mathrm{TT}$ have been extracted from the polarized cross-sections differences, $\Delta \sigma_{\parallel}\hspace{-0.06cm}\left(\nu,Q^{2}\right)$ and $\Delta \sigma_{\perp}\hspace{-0.06cm}\left(\nu,Q^{2}\right)$ measured for the $\vec{^\textrm{3}\textrm{He}}(\vec{\textrm{e}},\textrm{e}')\textrm{X}$ 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$^{\circ}$ and 9$^{\circ}$ from a longitudinally or transversely polarized $^{3}$He target. The data cover the kinematic regions of the quasi-elastic, resonance production and beyond. From the extracted spin-structure functions, the first moments $\overline{\Gamma_1}\hspace{-0.06cm}\left(Q^{2}\right)$, $\Gamma_2\hspace{-0.06cm}\left(Q^{2}\right)$ and $I_{\mathrm{TT}}\hspace{-0.06cm}\left(Q^{2}\right)$ are evaluated with high precision for the neutron in the $Q^2$ range from 0.035 to 0.24~GeV$^{2}$. The comparison of the data and the chiral effective field theory predictions reveals the importance of proper treatment of the $\Delta$ degree of freedom for spin observables., Comment: 7 pages, 5 figures, 3 tables. Version published in Phys. Lett. B

Published
2020

7. Precision Measurement of the Weak Charge of the Proton

Author

K. Bartlett, K. E. Mesick, W. R. Falk, P. M. King, R. S. Beminiwattha, A. Asaturyan, J. Leckey, P. Zang, J. Leacock, T. Averett, D. T. Spayde, M. M. Dalton, Ross D. Young, W. D. Ramsay, Vladimir Nelyubin, J. Balewski, J. F. Dowd, J. Roche, S. Yang, Darko Androić, A. Micherdzinska, M. Kargiantoulakis, John M. Finn, J. A. Magee, Kent Paschke, Jongmin Lee, R. W. L. Jones, P. Solvignon, S. Kowalski, L. Z. Ndukum, W. S. Duvall, S. Zhamkochyan, J. Birchall, V. Tvaskis, Riad Suleiman, A. R. Lee, B. Waidyawansa, J. Pan, D. C. Jones, Fatiha Benmokhtar, Wouter Deconinck, Jonathan W. Martin, S. Covrig Dusa, L. Lee, A. Mkrtchyan, Amrendra Narayan, R. Michaels, S. P. Wells, M. H. Shabestari, Geoffrey Smith, D. Gaskell, C. A. Davis, William A. Tobias, Jay Benesch, H. Mkrtchyan, Matthew Jones, Joseph Grames, S. A. Page, A. K. Opper, S. MacEwan, T. Seva, E. Korkmaz, Jean-Francois Rajotte, V. M. Gray, M. Poelker, C. Gal, D. S. Armstrong, J. A. Dunne, S. A. Wood, J. Mei, J. Beaufait, R. D. Carlini, Kathryn Grimm, F. Guo, S. K. Phillips, J. Diefenbach, P. Wang, D. J. Mack, N. Morgan, Michael Gericke, B. Sawatzky, T. A. Forest, R. Silwal, M. J. McHugh, M. Elaasar, R. Mahurin, J. C. Cornejo, Michael Pitt, R. Subedi, W. T. H. van Oers, Nuruzzaman, H. Nuhait, J. R. Hoskins, D. G. Meekins, Juliette Mammei, V. Tadevosyan, Dipangkar Dutta, Neven Simicevic, and A. Subedi

Subjects
Physics, Particle physics, Multidisciplinary, Large Hadron Collider, 010308 nuclear & particles physics, media_common.quotation_subject, Electroweak interaction, Dark matter, FOS: Physical sciences, Elementary particle, Parity (physics), Weak interaction, 7. Clean energy, 01 natural sciences, Asymmetry, 0103 physical sciences, Higgs boson, Nuclear Experiment (nucl-ex), 010306 general physics, weak charge of proton, parity violation, polarized electron beam, Nuclear Experiment, media_common
Abstract

The fields of particle and nuclear physics have undertaken extensive programs to search for evidence of physics beyond that explained by current theories. The observation of the Higgs boson at the Large Hadron Collider completed the set of particles predicted by the Standard Model (SM), currently the best description of fundamental particles and forces. However, the theory's limitations include a failure to predict fundamental parameters and the inability to account for dark matter/energy, gravity, and the matter-antimater asymmetry in the universe, among other phenomena. Given the lack of additional particles found so far through direct searches in the post-Higgs era, indirect searches utilizing precise measurements of well predicted SM observables allow highly targeted alternative tests for physics beyond the SM. Indirect searches have the potential to reach mass/energy scales beyond those directly accessible by today's high-energy accelerators. The value of the weak charge of the proton Q_W^p is an example of such an indirect search, as it sets the strength of the proton's interaction with particles via the well-predicted neutral electroweak force. Parity violation (invariance under spatial inversion (x,y,z) -> (-x,-y,-z)) is violated only in the weak interaction, thus providing a unique tool to isolate the weak interaction in order to measure the proton's weak charge. Here we report Q_W^p=0.0719+-0.0045, as extracted from our measured parity-violating (PV) polarized electron-proton scattering asymmetry, A_ep=-226.5+-9.3 ppb. Our value of Q_W^p is in excellent agreement with the SM, and sets multi-TeV-scale constraints on any semi-leptonic PV physics not described within the SM., Direct link to Nature Version "https://rdcu.be/954U"

Published
2019

8. Erratum: Polarization transfer observables in elastic electron-proton scattering at Q2=2.5 , 5.2, 6.8, and 8.5GeV2 [Phys. Rev. C 96 , 055203 (2017)]

Author

James A. Miller, D. J. Margaziotis, M. H. Shabestari, E. Tomasi-Gustafsson, V. Mamyan, S. Dhamija, James Maxwell, Y. Goncharenko, A. Shahinyan, M. Commisso, C. E. Keppel, A. J. R. Puckett, Dipanwita Dutta, Douglas Higinbotham, M. K. Jones, N. M. Piskunov, O. Rondon, J. Arrington, Bogdan Wojtsekhowski, X. Zheng, Emil Frlez, S. A. Wood, M. Veilleux, W.U. Boeglin, P. E. Reimer, S. Frullani, W. Luo, H. C. Fenker, William Bertozzi, Di. Kirillov, A. Mkrtchyan, L. Bimbot, Fatiha Benmokhtar, I. Albayrak, O. Moreno, E. J. Brash, H. Baghdasaryan, A. Daniel, Michael Kohl, S. Nedev, P. Carter, S. Covrig, D. S. Razin, W. Hinton, I. Sitnik, Z. Ye, David Hamilton, L. Y. Zhu, Y. Zhang, Rolf Ent, Tanja Horn, K. Shestermanov, L. Solovyev, J. Mulholland, M. Khandaker, C. F. Perdrisat, Ronald Ransome, Eric L. N. Jensen, V. A. Punjabi, D. G. Meekins, E. Piasetzky, A. Davidenko, A. Asaturyan, Y. Prok, Yu.M. Mel'nik, X. Zhang, Bi-Tao Hu, P. E. Bosted, J. Huang, K. Hafidi, W. Pierce, J. Reinhold, F. R. Wesselmann, Geoffrey Smith, P. Solvignon, H. Mkrtchyan, Y. Li, G. J. Kumbartzki, M. E. Christy, Yu.V. Zanevsky, G. Mbianda, Donal Day, Y. Matulenko, Nuruzzaman, Ronald Gilman, Andrei Afanasev, S. Danagoulian, S. P. Chernenko, C. Butuceanu, Amrendra Narayan, D. Gaskell, P. M. King, J. C. Cornejo, V. Kravtsov, A. Ahmidouch, Simon Širca, G. M. Huber, F. Garibaldi, M. Meziane, Lubomir Pentchev, R. Subedi, Shalev Gilad, K. A. Aniol, Bryan J. Moffit, Andrey Vasiliev, A. Marsh, and L. Smykov

Subjects
Physics, Particle physics, 010308 nuclear & particles physics, Multiplicative function, Estimator, Observable, Statistical fluctuations, Polarization (waves), 01 natural sciences, Weighting, 0103 physical sciences, 010306 general physics, Typographical error, Statistical hypothesis testing
Abstract

Subsequent to the release of our original paper, we discovered in the context of preparing our technical supplement [1] for journal publication that a typographical error had existed in the text file that the analysis program used to construct the beam polarization "database" for both the original analysis, published in Ref. [2], and our final analysis. The electron-beam polarization P e and the analyzing power A y cancel exactly in the ratio R , which is proportional to the ratio P t / P l of the transferred polarization components. On the other hand, the extraction of the relative e dependence of P l / P Born l relies on knowledge of the beam polarization. As such, data taking was interrupted roughly every two days during the GEp - 2 ? experiment to perform invasive measurements of the beam polarization using the Hall C Moller polarimeter [3]. The run range affected by the typographical error was entirely contained within the data collected at Q 2 = 2.5 GeV 2 with a beam energy of E e = 3.680 GeV during January 2008. The data from this configuration were combined with the data collected at E e = 3.548 GeV due to the nearly complete overlap of these two settings in terms of Q 2 and e acceptance. It is worth remarking that this typographical error went unnoticed for so long because it only affected a small fraction of the data (less than half of the combined data for ? e ? = 0.790 ) and the difference between the actually assigned beam polarization and the polarization that should have been assigned was comparable in magnitude to the point-to-point systematic uncertainty of the measurement itself. As such, its effect did not show up in various diagnostic plots and statistical tests, such as the time stability of the extracted P l / P Born l ratio. The data for both E e = 3.548 and E e = 3.680 GeV were reprocessed using the corrected beam polarizations to determine the effect of the typographical error on the combined physics results at ? e ? = 0.790 . Because the value of P e cancels in the ratio R , changes in the assumed beam polarization can only affect the results for R via statistical fluctuations due to changes in the relative weighting of different run ranges in the unbinned maximum-likelihood estimators for R . These effects are negligible on the scale of both the statistical and the systematic uncertainties of the data. More noticeable changes are expected in the ratio P l / P Born l since the extracted value of P l is inversely proportional to the assumed value of P e . Table I shows the effect of the corrected beam polarization database on the polarization transfer observables for the combined data for the ? e ? = 0.790 setting, the only measurement affected by the typographical error. The analyzing power did not need to be recalibrated since it was determined using the ? e ? = 0.153 data, which were not affected by the typographical error. As expected, the change in the ratio R is negligible. The value of P Born l , which is computed event by event from the global fit described in the Appendix of the original paper and does not depend on P e , is also unchanged. The magnitudes of P t , P l , and P l / P Born l are reduced by a common multiplicative factor, reflecting the fact that the beam polarization had been underestimated for the run range affected by the typographical error. The most important result of the corrected analysis is that the ratio P l / P Born l has decreased by 0.0024 from 1.0167 to 1.0143, a change comparable in magnitude to the statistical uncertainty but small compared to the total and point-to-point systematic uncertainties. The P l / P Born l result for the original publication [2] would be reduced by the same multiplicative factor as the final result. The physics conclusions of both publications are not materially changed by this correction. (Table Presented). (Figure Presented).

Published
2018

9. HCAL-J: hadron calorimeter for the study of nucleon form factors at Jefferson Lab

Author

Bogdan Wojtsekhowski, V. Brio, C. M. Sutera, Francesco Tortorici, V. Bellini, Catia Petta, B. P. Quinn, L. Re, J. C. Cornejo, and G. Franklin

Subjects
Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Nuclear Theory, Hadron, Electron, 01 natural sciences, Nuclear physics, Recoil, Dipole magnet, 0103 physical sciences, General Materials Science, Nuclear Experiment, form factors, 010302 applied physics, Physics, hadron calorimeter, Radiation, Spectrometer, 010308 nuclear & particles physics, Condensed Matter Physics, SuperBigBite spectrometer, Gas electron multiplier, Physics::Accelerator Physics, High Energy Physics::Experiment, Nucleon, Beam (structure), Jefferson Lab
Abstract

HCAL-J is a hadron calorimeter under construction at JLAB in Newport News, VA (USA).The main interest of the JLAB physics is the study of the hadron matter properties, using a longitudinally polarised electron beam; in particular, researchers investigate the electromagnetic form factors of nuclei and nucleons using the Continuous Electron Beam Accelerator Facility (CEBAF) accelerator, which provides a beam of 12 GeV electrons. The upgrade to higher energies allows measurements at high values of Q2 and a more in-depth study of the internal structure of the hadron matter.To this purpose, Hall A collaboration is building the SuperBigBite Spectrometer (SBS), which consists of a series of elements including a dipole magnet to curve the trajectory of the recoil particles, and a series of Gas Electron Multiplier (GEM) to track the particles. Moreover, two analyzers for the measurement of the polarisation components and a hadron calorimeter, HCAL-J, to measure the particle energy, are used in order to app...

Published
2018

10. Polarization transfer observables in elastic electron-proton scattering at Q2=2.5 , 5.2, 6.8, and 8.5 GeV2

Author

L. Smykov, Bogdan Wojtsekhowski, H. Mkrtchyan, L. Bimbot, H. C. Fenker, V. Kravtsov, James A. Miller, H. Baghdasaryan, K. Shestermanov, W. Hinton, Y. Matulenko, D. J. Margaziotis, Y. Li, M. H. Shabestari, S. Danagoulian, James Maxwell, Ronald Gilman, M. Commisso, E. Tomasi-Gustafsson, C. E. Keppel, X. Zheng, W. Pierce, X. Zhang, I. Albayrak, A. Asaturyan, Simon Širca, G. M. Huber, F. Garibaldi, A. Davidenko, Andrei Afanasev, Emil Frlez, G. Mbianda, S. Dhamija, J. Mulholland, O. Moreno, B. Moffit, S. Covrig, Yu.M. Mel'nik, Y. Goncharenko, Douglas Higinbotham, M. K. Jones, N. M. Piskunov, E. Jensen, J. Huang, Di. Kirillov, L. Solovyev, S. A. Wood, M. Veilleux, P. E. Reimer, Fatiha Benmokhtar, A. Daniel, Donal Day, Andrew Puckett, S. Frullani, William Bertozzi, Michael Kohl, S. Nedev, P. Carter, B. S. Hu, F. R. Wesselmann, S. P. Chernenko, E. J. Brash, V. A. Punjabi, David Hamilton, D. S. Razin, Y. Prok, M. Khandaker, C. Butuceanu, Amrendra Narayan, D. Gaskell, I. Sitnik, Nuruzzaman, W. Luo, Dipangkar Dutta, J. Arrington, Yu.V. Zanevsky, V. Mamyan, Rolf Ent, R. Subedi, Y. Zhang, Andrey Vasiliev, A. Marsh, A. Shahinyan, P. M. King, Joerg Reinhold, J. C. Cornejo, Shalev Gilad, Ronald Ransome, Lubomir Pentchev, K. A. Aniol, C. F. Perdrisat, D. G. Meekins, Z. Ye, W. U. Boeglin, L. Zhu, O. Rondon, M. Meziane, G. J. Kumbartzki, M. E. Christy, P. Bosted, P. Solvignon, G. R. Smith, A. Ahmidouch, E. Piasetzky, K. Hafidi, A. Mkrtchyan, and T. Horn

Subjects
Elastic scattering, Physics, Proton, 010308 nuclear & particles physics, Scattering, Electron, Polarization (waves), 01 natural sciences, Helicity, Nuclear physics, 0103 physical sciences, Born approximation, 010306 general physics, Nucleon
Abstract

Author(s): Puckett, AJR; Brash, EJ; Jones, MK; Luo, W; Meziane, M; Pentchev, L; Perdrisat, CF; Punjabi, V; Wesselmann, FR; Afanasev, A; Ahmidouch, A; Albayrak, I; Aniol, KA; Arrington, J; Asaturyan, A; Baghdasaryan, H; Benmokhtar, F; Bertozzi, W; Bimbot, L; Bosted, P; Boeglin, W; Butuceanu, C; Carter, P; Chernenko, S; Christy, ME; Commisso, M; Cornejo, JC; Covrig, S; Danagoulian, S; Daniel, A; Davidenko, A; Day, D; Dhamija, S; Dutta, D; Ent, R; Frullani, S; Fenker, H; Frlez, E; Garibaldi, F; Gaskell, D; Gilad, S; Gilman, R; Goncharenko, Y; Hafidi, K; Hamilton, D; Higinbotham, DW; Hinton, W; Horn, T; Hu, B; Huang, J; Huber, GM; Jensen, E; Keppel, C; Khandaker, M; King, P; Kirillov, D; Kohl, M; Kravtsov, V; Kumbartzki, G; Li, Y; Mamyan, V; Margaziotis, DJ; Marsh, A; Matulenko, Y; Maxwell, J; Mbianda, G; Meekins, D; Melnik, Y; Miller, J; Mkrtchyan, A; Mkrtchyan, H; Moffit, B; Moreno, O; Mulholland, J; Narayan, A; Nedev, S; Nuruzzaman; Piasetzky, E; Pierce, W; Piskunov, NM; Prok, Y; Ransome, RD; Razin, DS; Reimer, P; Reinhold, J | Abstract: Background: Interest in the behavior of nucleon electromagnetic form factors at large momentum transfers has steadily increased since the discovery, using polarization observables, of the rapid decrease of the ratio GEp/GMp of the proton's electric and magnetic form factors for momentum transfers Q21 GeV2, in strong disagreement with previous extractions of this ratio using the traditional Rosenbluth separation technique. Purpose: The GEp-III and GEp-2γ experiments were carried out in Jefferson Laboratory's (JLab's) Hall C from 2007 to 2008, to extend the knowledge of GEp/GMp to the highest practically achievable Q2 given the maximum beam energy of 6 GeV and to search for effects beyond the Born approximation in polarization transfer observables of elastic ∫ - p scattering. This article provides an expanded description of the common experimental apparatus and data analysis procedures, and reports the results of a final reanalysis of the data from both experiments, including the previously unpublished results of the full-acceptance dataset of the GEp-2γ experiment. Methods: Polarization transfer observables in elastic ∫ - p→∫ - scattering were measured at central Q2 values of 2.5, 5.2, 6.8, and 8.54 GeV2. At Q2=2.5GeV2, data were obtained for central values of the virtual photon polarization parameter ϵ of 0.149, 0.632, and 0.783. The Hall C High Momentum Spectrometer detected and measured the polarization of protons recoiling elastically from collisions of JLab's polarized electron beam with a liquid hydrogen target. A large-acceptance electromagnetic calorimeter detected the elastically scattered electrons in coincidence to suppress inelastic backgrounds. Results: The final GEp-III data are largely unchanged relative to the originally published results. The statistical uncertainties of the final GEp-2γ data are significantly reduced at ϵ=0.632 and 0.783 relative to the original publication. Conclusions: The final GEp-III results show that the decrease with Q2 of GEp/GMp continues to Q2=8.5GeV2, but at a slowing rate relative to the approximately linear decrease observed in earlier Hall A measurements. At Q2=8.5GeV2, GEp/GMp remains positive but is consistent with zero. At Q2=2.5GeV2, GEp/GMp derived from the polarization component ratio R-Pt/P shows no statistically significant ϵ dependence, as expected in the Born approximation. On the other hand, the ratio P""/P""Born of the longitudinal polarization transfer component to its Born value shows an enhancement of roughly 1.7% at ϵ=0.783 relative to ϵ=0.149, with ≈2.2σ significance based on the total uncertainty, implying a similar effect in the transverse component Pt that cancels in the ratio R.

Published
2017

11. First measurement of unpolarized semi-inclusive deep-inelastic scattering cross sections from a He3 target

Author

Nilanga Liyanage, D. J. Margaziotis, T. Liu, G. D. Cates, X. Zhan, Young Do Oh, Y. Li, E. Cisbani, P. C. Bradshaw, D. McNulty, Arijit Saha, C. Dutta, J. C. Cornejo, A. Kolarkar, Simon Širca, Chunhui Chen, R. A. Lindgren, J. J. LeRose, F. Garibaldi, A. Shahinyan, P. A. M. Dolph, F. Cusanno, William A. Tobias, L. G. Tang, Abdurahim Rakhman, X. Yan, Y. Zhang, W. Kim, V. Sulkosky, A. Deur, M. Huang, Ronald Ransome, H. Ding, H. F. Ibrahim, H. Yao, R. Michaels, Mustafa Canan, Xin Qian, S. K. Phillips, Kalyan Allada, William Bertozzi, Yanxi Zhang, Bogdan Wojtsekhowski, T. Averett, X. Jiang, C. Munoz Camacho, B. Zhao, L. Guo, E. Long, M. M. Dalton, Wouter Deconinck, M. Posik, L. El Fassi, S. Riordan, Wolfgang Korsch, P. E. Bosted, Haiyan Gao, Zein-Eddine Meziani, Ronald Gilman, David Hamilton, M. H. Shabestari, Pete Markowitz, Y. F. Wang, E. Chudakov, S. Frullani, X. Zong, A. Kelleher, M. Osipenko, I. Vilardi, Xiaofeng Zhu, Dipanwita Dutta, X. Deng, B. Sawatzky, Jen-Chieh Peng, G. Jin, A. J. R. Puckett, B. Moffit, Y. X. Ye, Houbing Lu, X. Zheng, S. Stepanyan, W. Chen, Fatiha Benmokhtar, R. De Leo, T. Holmstrom, L. Yuan, Vladimir Nelyubin, R. Subedi, Shalev Gilad, Diana Parno, K. Chirapatpimol, J. P. Chen, C. W. de Jager, O. Glamazdin, E. Schulte, K. A. Aniol, Olfred Hansen, J. R. M. Annand, S. K. Nanda, Yujie Qiang, S. Golge, L. Y. Zhu, J. Huang, G. M. Urciuoli, Alexandre Camsonne, Z. Ye, B. E. Norum, Y. Zhao, X. Li, Mauro Iodice, Douglas Higinbotham, M. K. Jones, K. Wang, S. Marrone, Amrendra Narayan, Joseph M. Katich, and D. Gaskell

Subjects
Quark, Quantum chromodynamics, Physics, Particle physics, 010308 nuclear & particles physics, Scattering, Quark model, Deep inelastic scattering, 01 natural sciences, Nuclear physics, 0103 physical sciences, Neutron, Nuclear cross section, 010306 general physics, Nucleon
Abstract

The unpolarized semi-inclusive deep-inelastic scattering (SIDIS) differential cross sections in He3(e,e′π±)X have been measured for the first time in Jefferson Lab experiment E06-010 with a 5.9GeVe− beam on a He3 gas target. The experiment focuses on the valence quark region, covering a kinematic range 0.12

Published
2017

12. Precision Electron-Beam Polarimetry at 1 GeV Using Diamond Microstrip Detectors

Author

P. M. King, G. D. Cates, Dipangkar Dutta, M. M. Dalton, W. D. Ramsay, M. McDonald, B. S. Cavness, A. Tobias, S. Kowalski, L. Lee, Wouter Deconinck, H. Mkrtchyan, B. Waidyawansa, J. C. Cornejo, Vladimir Nelyubin, S. A. Page, Kent Paschke, R. W. L. Jones, S. Zhamkotchyan, Jonathan W. Martin, Douglas Storey, P. Solvignon, G. Hays, Amber McCreary, Jay Benesch, P. Wang, L. A. Dillon-Townes, A. Asaturyan, E. Ihloff, V. Tvaskis, A. Mkrtchyan, Erik Urban, D. C. Jones, C. Vidal, A. Micherdzinska, Leonid Kurchaninov, Amrendra Narayan, D. Gaskell, Bates Linear Accelerator Center, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Ihloff, Ernest E., Kowalski, Stanley B., and Vidal, Christopher J.

Subjects
Physics, 010308 nuclear & particles physics, business.industry, Scattering, QC1-999, Compton scattering, Polarimetry, General Physics and Astronomy, Diamond, Electron, engineering.material, 01 natural sciences, Particle detector, Optics, Deflection (physics), 0103 physical sciences, Cathode ray, engineering, Physics::Accelerator Physics, 010306 general physics, business
Abstract

We report on the highest precision yet achieved in the measurement of the polarization of a low-energy, O(1 GeV), continuous-wave (CW) electron beam, accomplished using a new polarimeter based on electron-photon scattering, in Hall C at Jefferson Lab. A number of technical innovations were necessary, including a novel method for precise control of the laser polarization in a cavity and a novel diamond microstrip detector that was able to capture most of the spectrum of scattered electrons. The data analysis technique exploited track finding, the high granularity of the detector, and its large acceptance. The polarization of the 180-μA, 1.16-GeV electron beam was measured with a statistical precision of, United States. Dept. of Energy (Contract AC05-06OR23177), National Science Foundation (U.S.), Natural Sciences and Engineering Research Council of Canada

Published
2015

13. Double spin asymmetries of inclusive hadron electroproduction from a transversely polarizedHe3target

Author

S. K. Nanda, Yujie Qiang, H. Yao, M. M. Dalton, S. Riordan, Bogdan Wojtsekhowski, S. S. Stepanyan, Mustafa Canan, T. Holmstrom, Wolfgang Korsch, Kalyan Allada, J. C. Cornejo, L. G. Tang, Y. Zhang, D. McNulty, P. A. M. Dolph, T. Averett, Abdurahim Rakhman, M. Huang, Jen-Chieh Peng, X. Zong, S. K. Phillips, B. Sawatzky, X. Li, G. Jin, X. Zheng, C. Dutta, Nilanga Liyanage, Franco Garibaldi, L. Yuan, A. Camsonne, Chunhui Chen, B. Zhao, L. Guo, K. Chirapatpimol, Salvatore Frullani, Y. Li, D. J. Margaziotis, Simon Širca, Young Do Oh, Vincent Sulkosky, E. Long, Mauro Iodice, F. Cusanno, L. Y. Zhu, William A. Tobias, W. Kim, A. Deur, E. Cisbani, A. J. R. Puckett, J. P. Chen, Fatiha Benmokhtar, S. Golge, A. Kelleher, H. J. Lu, A. Shahinyan, R. A. Lindgren, J. J. LeRose, Yong Zhang, I. Vilardi, H. Ding, A. Kolarkar, Vladimir Nelyubin, J. Huang, G. M. Urciuoli, H. F. Ibrahim, E. Schulte, Xiaofeng Zhu, Dipangkar Dutta, R. Michaels, G. D. Cates, X. Zhan, E. Chudakov, M. Osipenko, William Bertozzi, Haiyan Gao, O. Glamazdin, Z. Ye, B. E. Norum, Diana Parno, S. Marrone, Olfred Hansen, J. R. M. Annand, Y. Zhao, David Hamilton, Pete Markowitz, A. Saha, M. H. Shabestari, P. Bosted, Y. X. Ye, R. De Leo, X. Yan, Ronald Ransome, Xin Qian, Yingxiao Wang, P. C. Bradshaw, M. Posik, X. Deng, Zein-Eddine Meziani, L. El Fassi, C. Muñoz Camacho, Shalev Gilad, C. W. de Jager, K. A. Aniol, Wouter Deconinck, R. Subedi, Amrendra Narayan, Joseph M. Katich, D. Gaskell, Ronald Gilman, Douglas Higinbotham, M. K. Jones, B. Moffit, K. Wang, X. Jiang, and W. Chen

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Scattering, Hadron, chemistry.chemical_element, Parton, Horizontal plane, Polarization (waves), Helicity, Nuclear physics, chemistry, Cathode ray, High Energy Physics::Experiment, Nuclear Experiment, Helium
Abstract

We report the measurement of beam-target double-spin asymmetries ALT in the inclusive production of identified hadrons, e +³He↑ → h + X, using a longitudinally polarized 5.9 GeV electron beam and a transversely polarized ³He target. Hadrons (π±, K± and proton) were detected at 16° with an average momentum h>=2.35 GeV/c and a transverse momentum (pT) coverage from 0.60 to 0.68 GeV/c. Asymmetries from the ³He target were observed to be non-zero for π± production when the target was polarized transversely in the horizontal plane. The π⁺ and π⁻ asymmetries have opposite signs, analogous to the behavior of ALT in semi-inclusive deep-inelastic scattering.

Published
2015

14. Measurement of 'pretzelosity' asymmetry of charged pion production in semi-inclusive deep inelastic scattering on a polarizedHe3target

Author

Jen-Chieh Peng, M. Osipenko, L. Yuan, K. Chirapatpimol, J. P. Chen, Y. X. Ye, Franco Garibaldi, Simon Širca, Y. Zhang, M. Huang, W. Kim, R. A. Lindgren, J. J. LeRose, J. Huang, G. M. Urciuoli, A. Kolarkar, A. Deur, X. Jiang, A. Saha, I. Vilardi, H. Ding, Salvatore Frullani, D. J. Margaziotis, M. M. Dalton, M. H. Shabestari, J. C. Cornejo, S. Riordan, R. Michaels, Xiaofeng Zhu, Douglas Higinbotham, M. K. Jones, C. Muñoz Camacho, B. Sawatzky, L. G. Tang, B. Zhao, X. Li, X. Zhan, X. Yan, M. Posik, X. Deng, Y. Li, Mauro Iodice, Abdurahim Rakhman, P. C. Bradshaw, William Bertozzi, T. Averett, S. Golge, D. McNulty, A. Camsonne, H. J. Lu, T. Holmstrom, David Hamilton, Pete Markowitz, H. Yao, Diana Parno, L. Guo, K. Wang, X. Zong, Chunhui Chen, Vincent Sulkosky, E. Long, S. Marrone, W. Chen, Z. E. Meziani, R. De Leo, Bogdan Wojtsekhowski, G. D. Cates, Yong Zhang, S. S. Stepanyan, A. Kelleher, B. Moffit, Vladimir Nelyubin, F. Cusanno, Nilanga Liyanage, Amrendra Narayan, Joseph M. Katich, P. Bosted, A. J. R. Puckett, Z. Ye, B. E. Norum, Mustafa Canan, Kalyan Allada, D. Gaskell, A. Shahinyan, Wolfgang Korsch, Fatiha Benmokhtar, E. Cisbani, Ronald Gilman, P. A. M. Dolph, Ronald Ransome, Xin Qian, L. El Fassi, Young Do Oh, C. Dutta, William A. Tobias, Yingxiao Wang, G. Jin, X. Zheng, S. K. Phillips, Shalev Gilad, C. W. de Jager, K. A. Aniol, H. F. Ibrahim, S. K. Nanda, Yujie Qiang, Dipangkar Dutta, Wouter Deconinck, R. Subedi, E. Chudakov, O. Glamazdin, Olfred Hansen, J. R. M. Annand, L. Y. Zhu, Haiyan Gao, and E. Schulte

Subjects
Quark, Physics, Nuclear and High Energy Physics, Particle physics, Scattering, media_common.quotation_subject, Deep inelastic scattering, Asymmetry, Nuclear physics, Pion, Distribution function, Neutron, Nuclear Experiment, Nucleon, media_common
Abstract

An experiment to measure single-spin asymmetries of semi-inclusive production of charged pions in deep-inelastic scattering on a transversely polarized $^{3}\mathrm{He}$ target was performed at Jefferson Laboratory in the kinematic region of $0.16lxl0.35$ and $1.4l{Q}^{2}l2.7$ ${\mathrm{GeV}}^{2}$. Pretzelosity asymmetries on $^{3}\mathrm{He}$, which are expressed as the convolution of the ${h}_{1T}^{\ensuremath{\perp}}$ transverse-momentum-dependent distribution functions and the Collins fragmentation functions in the leading order, were measured for the first time. Under the effective polarization approximation, we extracted the corresponding neutron asymmetries from the measured $^{3}\mathrm{He}$ asymmetries and cross-section ratios between the proton and $^{3}\mathrm{He}$. Our results show that both ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$ on $^{3}\mathrm{He}$ and on neutron pretzelosity asymmetries are consistent with zero within experimental uncertainties.

Published
2014

15. Measurement of the Target-Normal Single-Spin Asymmetry in Deep-Inelastic Scattering from the Reaction He3↑(e,e′)X

Author

W. Chen, S. Marrone, M. Osipenko, A. Kolarkar, Salvatore Frullani, Nilanga Liyanage, D. J. Margaziotis, E. Cisbani, T. Averett, M. Huang, X. Jiang, L. Guo, E. Long, Y. X. Ye, Wouter Deconinck, G. Jin, Bogdan Wojtsekhowski, H. Yao, X. Zheng, R. Subedi, F. Cusanno, A. Kelleher, S. K. Nanda, Yujie Qiang, William Bertozzi, X. Yan, Ronald Ransome, David Hamilton, Fatiha Benmokhtar, C. Dutta, Pete Markowitz, Xin Qian, M. H. Shabestari, P. A. M. Dolph, L. El Fassi, L. Zhu, R. De Leo, X. Deng, J. C. Cornejo, L. G. Tang, Yingxiao Wang, J. P. Chen, W. Kim, Shalev Gilad, D. McNulty, C. W. de Jager, K. A. Aniol, J. Huang, G. M. Urciuoli, Chunhui Chen, X. Zhan, Diana Parno, S. K. Phillips, X. Li, B. Moffit, Mauro Iodice, Wolfgang Korsch, Franco Garibaldi, S. S. Stepanyan, Simon Širca, Mustafa Canan, Kalyan Allada, Xiaofeng Zhu, A. Shahinyan, M. Posik, X. Zong, A. J. R. Puckett, Y. Li, P. Bosted, Z. E. Meziani, R. A. Lindgren, J. J. LeRose, A. Saha, M. M. Dalton, Jen-Chieh Peng, B. Sawatzky, Young Do Oh, I. Vilardi, H. Ding, P. C. Bradshaw, S. Riordan, L. Yuan, T. Holmstrom, H. F. Ibrahim, K. Chirapatpimol, Dipangkar Dutta, A. Camsonne, E. Chudakov, Vincent Sulkosky, A. Deur, R. Michaels, C. Muñoz Camacho, B. Zhao, Adam M. Tobias, G. D. Cates, Douglas Higinbotham, Yong Zhang, M. K. Jones, E. Schulte, O. Glamazdin, Vladimir Nelyubin, Olfred Hansen, J. R. M. Annand, K. Wang, Abdurahim Rakhman, Y. Zhang, Haiyan Gao, Amrendra Narayan, Joseph M. Katich, D. Gaskell, S. Golge, H. J. Lu, Ronald Gilman, Z. Ye, B. E. Norum, and Y. Zhao

Subjects
Physics, Range (particle radiation), Scattering, media_common.quotation_subject, General Physics and Astronomy, Deep inelastic scattering, Asymmetry, Nuclear physics, Cathode ray, High Energy Physics::Experiment, Born approximation, Nuclear Experiment, media_common, Sign (mathematics), Spin-½
Abstract

We report the first measurement of the target-normal single-spin asymmetry in deep-inelastic scattering from the inclusive reaction ^3He^↑ (e,e′) X on a polarized ^3He 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 1.7 2 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
2014

16. Early Results from the Qweak Experiment

Author

J. Beaufait, H. Mkrtchyan, J. Roche, J. A. Dunne, Jean-Francois Rajotte, Kathryn Grimm, S. K. Phillips, J. Diefenbach, S. Covrig, S. MacEwan, T. Seva, E. Korkmaz, D. G. Meekins, Matthew Jones, M. M. Dalton, T. Averett, D. C. Jones, Kent Paschke, R. W. L. Jones, Fatiha Benmokhtar, J. A. Magee, R. Michaels, P. M. King, W. D. Ramsay, R. S. Beminiwattha, M. H. Shabestari, Wouter Deconinck, V. Tadevosyan, A. Asaturyan, R. D. Carlini, S. Kowalski, W. S. Duvall, Jay Benesch, F. Guo, J. Birchall, A. Micherdzinska, Joseph Grames, Ross D. Young, J. W. Martin, B. Waidyawansa, J. F. Dowd, Michael Pitt, S. Yang, Geoffrey Smith, S. A. Page, V. M. Gray, M. Poelker, Nuruzzaman, R. Silwal, G. D. Cates, P. Wang, S. P. Wells, T. A. Forest, Jongmin Lee, Dipangkar Dutta, K. Johnston, A. R. Lee, J. Leacock, B. Sawatzky, M. Elaasar, J. Mei, D. S. Armstrong, Riad Suleiman, A. Subedi, S. A. Wood, R. Mahurin, Amrendra Narayan, L. Lee, J. Balewski, P. Solvignon, D. J. Mack, R. Subedi, John M. Finn, W. R. Falk, M. Kargiantoulakis, N. Morgan, L. Z. Ndukum, Vladimir Nelyubin, M. J. McHugh, Neven Simicevic, W. T. H. van Oers, C. A. Davis, William A. Tobias, D. Gaskel, Michael Gericke, J. C. Cornejo, J. R. Hoskins, J. Pan, Darko Androić, Juliette Mammei, S. Zhamkochyan, J. Leckey, D. T. Spayde, A. K. Opper, K. E. Myers, V. Tvaskis, and A. Mkrtchyan

Subjects
Physics, Quark, Scattering, media_common.quotation_subject, Physics beyond the Standard Model, QC1-999, FOS: Physical sciences, Electron, Measure (mathematics), Asymmetry, Nuclear physics, Neutron, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment, Beam (structure), media_common
Abstract

A subset of results from the recently completed Jefferson Lab Qweak experiment are reported. This experiment, sensitive to physics beyond the Standard Model, exploits the small parity-violating asymmetry in elastic ep scattering to provide the first determination of the protons weak charge Qweak(p). The experiment employed a 180 uA longitudinally polarized 1.16 GeV electron beam on a 35 cm long liquid hydrogen target. Scattered electrons corresponding to Q2 of 0.025 GeV2 were detected in eight Cerenkov detectors arrayed symmetrically around the beam axis. The goals of the experiment were to provide a measure of Qweak(p) to 4.2 percent (combined statistical and systematic error), which implies a measure of sin2(thetaw) at the level of 0.3 percent, and to help constrain the vector weak quark charges C1u and C1d. The experimental method is described, with particular focus on the challenges associated with the worlds highest power LH2 target. The new constraints on C1u and C1d provided by the subset of the experiments data analyzed to date will also be shown, together with the extracted weak charge of the neutron., Comment: 8 pages, 4 figures, INPC2013

Published
2014

17. 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

18. Single Spin Asymmetries of Inclusive Hadrons Produced in Electron Scattering from a Transversely Polarized $^3$He Target

Author

B. Sawatzky, X. Li, M. Posik, A. Camsonne, Xiaofeng Zhu, Mauro Iodice, Nilanga Liyanage, Vincent Sulkosky, Yingxiao Wang, T. Averett, J. P. Chen, Bogdan Wojtsekhowski, X. Zong, J. Huang, G. M. Urciuoli, Ronald Gilman, J. C. Cornejo, X. Yan, A. J. R. Puckett, Shalev Gilad, C. W. de Jager, R. A. Lindgren, J. J. LeRose, E. Cisbani, K. A. Aniol, W. Kim, M. H. Shabestari, Fatiha Benmokhtar, L. G. Tang, I. Vilardi, B. Moffit, A. Tobias, Wouter Deconinck, H. Ding, R. Michaels, Franco Garibaldi, Salvatore Frullani, Simon Širca, William Bertozzi, R. Subedi, F. Cusanno, G. D. Cates, A. Kolarkar, X. Deng, Amrendra Narayan, H. J. Lu, David Hamilton, Pete Markowitz, H. Yao, Joseph M. Katich, D. Gaskell, A. Deur, Haiyan Gao, C. Dutta, Y. Li, P. A. M. Dolph, R. De Leo, T. Holmstrom, D. McNulty, Arijit Saha, G. Jin, X. Zhan, Douglas Higinbotham, M. K. Jones, X. Zheng, O. Glamazdin, Olfred Hansen, J. R. M. Annand, S. Marrone, Chunhui Chen, Jen-Chieh Peng, S. K. Nanda, L. Guo, A. Shahinyan, M. Osipenko, Yujie Qiang, W. Chen, E. Long, L. Y. Zhu, K. Wang, Z. Ye, B. E. Norum, Y. Zhao, L. Yuan, Y. X. Ye, K. Chirapatpimol, Ronald Ransome, Y. Zhang, Diana Parno, Xin Qian, P. C. Bradshaw, A. Kelleher, E. Schulte, P. Bosted, M. Huang, S. Golge, X. Jiang, L. El Fassi, Z. E. Meziani, Wolfgang Korsch, D. J. Margaziotis, Young Do Oh, S. K. Phillips, C. Muñoz Camacho, B. Zhao, H. F. Ibrahim, Dipangkar Dutta, E. Chudakov, S. S. Stepanyan, Mustafa Canan, Kalyan Allada, Abdurahim Rakhman, Yong Zhang, Vladimir Nelyubin, M. M. Dalton, and S. Riordan

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Proton, media_common.quotation_subject, Nuclear Theory, Hadron, High Energy Physics::Phenomenology, FOS: Physical sciences, Asymmetry, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Pion, Neutron, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment, Electron scattering, Spin-½, media_common
Abstract

We report the first measurement of target single-spin asymmetries (A$_N$) in the inclusive hadron production reaction, $e~$+$~^3\text{He}^{\uparrow}\rightarrow h+X$, using a transversely polarized $^3$He target. The experiment was conducted at Jefferson Lab in Hall A using a 5.9-GeV electron beam. Three types of hadrons ($\pi^{\pm}$, $\text{K}^{\pm}$ and proton) were detected in the transverse hadron momentum range 0.54 $, Comment: Updated version, submitted to Phys. Rev. C

Published
2013
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19. The ${Q^{p}_{\rm Weak}}$ experiment

Author

D. Androic, D. S. Armstrong, A. Asaturyan, T. Averett, J. Balewski, J. Beaufait, R. S. Beminiwattha, J. Benesch, F. Benmokhtar, J. Birchall, R. D. Carlini, J. C. Cornejo, S. Covrig, M. M. Dalton, C. A. Davis, W. Deconinck, J. Diefenbach, K. Dow, J. F. Dowd, J. A. Dunne, D. Dutta, W. S. Duvall, M. Elaasar, W. R. Falk, J. M. Finn, T. Forest, D. Gaskell, M. T. W. Gericke, J. Grames, V. M. Gray, K. Grimm, F. Guo, J. R. Hoskins, K. Johnston, D. Jones, M. Jones, R. Jones, M. Kargiantoulakis, P. M. King, E. Korkmaz, S. Kowalski, J. Leacock, J. Leckey, A. R. Lee, J. H. Lee, L. Lee, S. MacEwan, D. Mack, J. A. Magee, R. Mahurin, J. Mammei, J. Martin, M. McHugh, D. Meekins, J. Mei, R. Michaels, A. Micherdzinska, K. E. Myers, A. Mkrtchyan, H. Mkrtchyan, A. Narayan, L. Z. Ndukum, V. Nelyubin, N. Nuruzzaman, W. T. H van Oers, A. K. Opper, S. A. Page, J. Pan, K. Paschke, S. K. Phillips, M. L. Pitt, M. Poelker, J. F. Rajotte, W. D. Ramsay, J. Roche, B. Sawatzky, T. Seva, M. H. Shabestari, R. Silwal, N. Simicevic, G. Smith, P. Solvignon, D. T. Spayde, A. Subedi, R. Subedi, R. Suleiman, V. Tadevosyan, W. A. Tobias, V. Tvaskis, B. Waidyawansa, P. Wang, S. P. Wells, S. A. Wood, S. Yang, R. D. Young, S. Zhamkochyan, and D. Zou

Published
2013

20. Polarization components in π0 photoproduction at photon energies up to 5.6 GeV

Author

M. Commisso, C. E. Keppel, L. Y. Zhu, Emil Frlez, L. Solovyev, S. Frullani, V. A. Punjabi, I. Albayrak, G. Mbianda, D. G. Meekins, I. I. Strakovsky, P. Bosted, Douglas Higinbotham, M. K. Jones, N. M. Piskunov, Y. Zhang, M. Meziane, E. Jensen, Donal Day, C. F. Perdrisat, A. Mkrtchyan, H. Mkrtchyan, A. Ahmidouch, P. E. Reimer, W. Hinton, H. C. Fenker, Nuruzzaman, E. J. Brash, Omar Moreno, S. Dhamija, P. M. King, Di. Kirillov, I. Sitnik, Y. Li, A. Asaturyan, A. Shahinyan, D. S. Razin, Fatiha Benmokhtar, Y. Matulenko, S. A. Wood, A. Daniel, E. Piasetzky, M. H. Shabestari, D. J. Margaziotis, S. Danagoulian, M. Veilleux, X. Zhang, V. Mamyan, E. Tomasi-Gustafsson, J. Huang, A. Davidenko, O. Ates, Dipanwita Dutta, L. Bimbot, Ronald Gilman, K. Hafidi, V. Kravtsov, Y. Goncharenko, J. Arrington, Yu.M. Mel'nik, Y. Prok, A. J. R. Puckett, Z. Ye, H. Baghdasaryan, F. R. Wesselmann, Bi-Tao Hu, William Bertozzi, Lubomir Pentchev, R. Subedi, S. P. Chernenko, Riad Suleiman, Simon Širca, G. M. Huber, F. Garibaldi, S. Covrig, David Hamilton, C. Butuceanu, Pete Markowitz, Amrendra Narayan, Rolf Ent, J. Mulholland, L. Smykov, D. Gaskell, Michael Kohl, S. Nedev, P. Carter, M. Khandaker, Tanja Horn, James A. Miller, G. J. Kumbartzki, M. E. Christy, James Maxwell, J. Reinhold, X. Zheng, O. Rondon, W. Luo, George Davey Smith, Ronald Ransome, Shalev Gilad, J. C. Cornejo, W. U. Boeglin, K. A. Aniol, Bryan J. Moffit, Andrey Vasiliev, A. Marsh, W. Pierce, Yu.V. Zanevsky, P. Solvignon, H. Kang, K. Shestermanov, 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), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and 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)

Subjects
Quantum chromodynamics, Physics, Particle physics, Proton, 010308 nuclear & particles physics, Scattering, Hadron, General Physics and Astronomy, Perturbative QCD, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Photon energy, 01 natural sciences, 7. Clean energy, Helicity, Nuclear physics, Pion, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Nuclear Experiment
Abstract

We present new data for the polarization observables of the final state proton in the $^{1}H(\vec{\gamma},\vec{p})\pi^{0}$ reaction. These data can be used to test predictions based on hadron helicity conservation (HHC) and perturbative QCD (pQCD). These data have both small statistical and systematic uncertainties, and were obtained with beam energies between 1.8 and 5.6 GeV and for $\pi^{0}$ scattering angles larger than 75$^{\circ}$ in center-of-mass (c.m.) frame. The data extend the polarization measurements data base for neutral pion photoproduction up to $E_{\gamma}=5.6 GeV$. The results show non-zero induced polarization above the resonance region. The polarization transfer components vary rapidly with the photon energy and $\pi^{0}$ scattering angle in c.m. frame. This indicates that HHC does not hold and that the pQCD limit is still not reached in the energy regime of this experiment., Comment: 6 pages and 2 figures

Published
2012

21. Beam-Target Double-Spin AsymmetryALTin Charged Pion Production from Deep Inelastic Scattering on a Transversely PolarizedHe3Target at1.4<Q2<2.7 GeV2

Author

Jen-Chieh Peng, Wolfgang Korsch, L. Yuan, L. G. Tang, Nilanga Liyanage, K. Chirapatpimol, S. K. Nanda, Yujie Qiang, A. Shahinyan, Z. E. Meziani, H. J. Lu, X. Yan, Salvatore Frullani, Y. Li, D. J. Margaziotis, E. Cisbani, R. A. Lindgren, J. J. LeRose, A. Deur, L. Guo, E. Long, B. Zhao, X. Zhan, Ronald Gilman, I. Vilardi, H. Ding, Wouter Deconinck, A. Kelleher, G. Jin, R. Subedi, Diana Parno, X. Zheng, Bogdan Wojtsekhowski, Ronald Ransome, P. Bosted, Z. Ye, B. E. Norum, Xin Qian, Y. Zhang, W. Kim, Franco Garibaldi, B. Sawatzky, P. A. M. Dolph, Simon Širca, R. Michaels, J. C. Cornejo, C. Dutta, W. Chen, Douglas Higinbotham, M. K. Jones, B. Moffit, A. Camsonne, F. Cusanno, Vincent Sulkosky, X. Zong, A. J. R. Puckett, L. El Fassi, Xiaofeng Zhu, S. Golge, X. Li, C. Muñoz Camacho, K. Wang, Yingxiao Wang, M. Huang, G. D. Cates, M. Posik, Shalev Gilad, C. W. de Jager, X. Jiang, K. A. Aniol, M. H. Shabestari, M. Osipenko, Mauro Iodice, Y. X. Ye, William Bertozzi, H. F. Ibrahim, S. Marrone, Amrendra Narayan, Joseph M. Katich, D. Gaskell, David Hamilton, Pete Markowitz, Dipangkar Dutta, X. Deng, R. De Leo, J. P. Chen, S. S. Stepanyan, Mustafa Canan, Chen Chen, Kalyan Allada, T. Holmstrom, D. McNulty, E. Chudakov, T. Averett, J. Huang, G. M. Urciuoli, Young Do Oh, A. Tobias, Fatiha Benmokhtar, Abdurahim Rakhman, A. Kolarkar, M. M. Dalton, S. Riordan, A. Saha, Yong Zhang, Vladimir Nelyubin, Haiyan Gao, P. C. Bradshaw, S. K. Phillips, O. Glamazdin, Olfred Hansen, J. R. M. Annand, L. Y. Zhu, E. Schulte, and H. Yao

Subjects
Quark, Physics, Particle physics, 010308 nuclear & particles physics, Scattering, media_common.quotation_subject, General Physics and Astronomy, Parton, Electron, Deep inelastic scattering, 01 natural sciences, Asymmetry, Nuclear physics, Pion, 0103 physical sciences, High Energy Physics::Experiment, Neutron, Nuclear Experiment, 010306 general physics, media_common
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 ^3He target. The kinematics focused on the valence quark region, 0.16

Published
2012

22. Single Spin Asymmetries in Charged Pion Production from Semi-Inclusive Deep Inelastic Scattering on a Transversely PolarizedHe3Target atQ2=1.4–2.7 GeV2

Author

A. Kolarkar, M. Huang, X. Jiang, C. Dutta, M. Osipenko, T. Averett, H. Yao, W. Chen, Abdurahim Rakhman, L. G. Tang, Bogdan Wojtsekhowski, Y. X. Ye, X. Zhan, X. Yan, O. Glamazdin, Olfred Hansen, J. R. M. Annand, Fatiha Benmokhtar, D. McNulty, Arijit Saha, Diana Parno, W. Kim, Nilanga Liyanage, Wouter Deconinck, R. Subedi, D. J. Margaziotis, Salvatore Frullani, Chunhui Chen, P. Bosted, Yingxiao Wang, Yong Zhang, Shalev Gilad, Vladimir Nelyubin, Wolfgang Korsch, M. M. Dalton, Yuxiang Zhao, E. Cisbani, C. W. de Jager, K. A. Aniol, L. Guo, S. Riordan, E. Long, L. Y. Zhu, M. H. Shabestari, A. Kelleher, X. Li, S. K. Phillips, Mauro Iodice, E. Schulte, J. P. Chen, X. Deng, A. Shahinyan, G. Jin, X. Zheng, J. Huang, G. M. Urciuoli, S. K. Nanda, P. A. M. Dolph, Yujie Qiang, J. C. Cornejo, A. Tobias, William Bertozzi, S. Marrone, David Hamilton, Pete Markowitz, R. De Leo, Franco Garibaldi, Simon Širca, Ronald Ransome, S. S. Stepanyan, Xin Qian, Mustafa Canan, Kalyan Allada, B. Moffit, L. El Fassi, Xiaofeng Zhu, Z. E. Meziani, R. A. Lindgren, J. J. LeRose, I. Vilardi, H. Ding, B. Sawatzky, G. D. Cates, A. Camsonne, Vincent Sulkosky, Y. Li, X. Zong, R. Michaels, H. F. Ibrahim, C. Muñoz Camacho, Dipangkar Dutta, B. Zhao, A. J. R. Puckett, Haiyan Gao, E. Chudakov, T. Holmstrom, Young Do Oh, F. Cusanno, Douglas Higinbotham, M. K. Jones, A. Deur, M. Posik, P. C. Bradshaw, K. Wang, H. J. Lu, Jen-Chieh Peng, Ronald Gilman, L. Yuan, K. Chirapatpimol, Z. Ye, B. E. Norum, Y. Zhang, Amrendra Narayan, Joseph M. Katich, D. Gaskell, and S. Golge

Subjects
Physics, Particle physics, Proton, 010308 nuclear & particles physics, Hadron, General Physics and Astronomy, Inelastic scattering, Deep inelastic scattering, 01 natural sciences, Baryon, Nuclear physics, Pion, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon, Lepton
Abstract

We report the first measurement of target single spin asymmetries in the semi-inclusive ^3He(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 0.16

Published
2011

23. 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

24. 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

25. Search for Effects Beyond the Born Approximation in Polarization Transfer Observables ine→pElastic Scattering

Author

M. H. Shabestari, O. Ates, I. Albayrak, T. Horn, L. Pentchev, M. Commisso, H. Mkrtchyan, C. E. Keppel, Ronald Ransome, D. J. Margaziotis, W. Pierce, X. Zhang, Y. Matulenko, L. Y. Zhu, Emil Frlez, G. R. Smith, W. Hinton, John Arrington, D. G. Meekins, I. Sitnik, Ronald Gilman, A. Asaturyan, L. Bimbot, P. Solvignon, S. Covrig, E. Piasetzky, F. R. Wesselmann, Shalev Gilad, H. Baghdasaryan, W. U. Boeglin, J. Huang, P. M. King, Douglas Higinbotham, C. F. Perdrisat, M. K. Jones, N. M. Piskunov, P. Bosted, Z. Ye, L. Smykov, G. Mbianda, Y. Li, Kravtsov, K. A. Aniol, K. Hafidi, E. Jensen, Dipangkar Dutta, E. Tomasi-Gustafsson, William Bertozzi, James A. Miller, Y. Zhang, J. Reinhold, O. Moreno, David Hamilton, W. Luo, D. S. Razin, Pete Markowitz, M. Khandaker, Bogdan Wojtsekhowski, James Maxwell, P. E. Reimer, Donal Day, O. Rondon, Michael Kohl, S. Nedev, X. Zheng, P. Carter, S. P. Chernenko, D. Kirillov, Andrey Vasiliev, A. Marsh, C. Butuceanu, L. Solovyev, G. Kumbartzki, Marc Vanderhaeghen, Amrendra Narayan, Fatiha Benmokhtar, B. Hu, D. Gaskell, E. Christy, Yu.M. Mel'nik, Punjabi, S. A. Wood, A. Ahmidouch, M. Veilleux, A. Mkrtchyan, S. Frullani, J. Mulholland, R. Subedi, S. Dhamija, S. Danagoulian, B. Moffit, Yu.V. Zanevsky, Y. Prok, K. Shestermanov, M. Meziane, A. Davidenko, Mamyan, J. C. Cornejo, H. Kang, H. C. Fenker, Nuruzzaman, Rolf Ent, A. Shahinyan, Y. Goncharenko, Simon Širca, G. M. Huber, F. Garibaldi, A. J. R. Puckett, A. Daniel, R. Suleiman, and E. J. Brash

Subjects
Elastic scattering, Physics, Particle physics, 010308 nuclear & particles physics, Hadron, Momentum transfer, General Physics and Astronomy, Elementary particle, 01 natural sciences, Baryon, 0103 physical sciences, Magnetic form factor, High Energy Physics::Experiment, Born approximation, 010306 general physics, Nucleon
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 (TPEX) 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 $$H(\vec{e},e'\vec{p})$$ reaction for three different beam energies at a fixed squared momentum transfer $Q^2 = 2.5$ GeV$^2$, spanning a wide range of the virtual photon polarization parameter, $$\epsilon$$. From these measured polarization observables, we have obtained separately the ratio $R$, which equals $$\mu_p G_{E}/G_{M}$$ in the Born approximation, and the longitudinal polarization transfer component $$P_\ell$$, with statistical and systematic uncertainties of $$\Delta R \approx \pm 0.01 \mbox{(stat)} \pm 0.013 \mbox{(syst)}$$ and $$\Delta P_\ell/P^{Born}_{\ell} \approx \pm 0.006 \mbox{(stat)}\pm 0.01 \mbox{(syst)}$$. The ratio $R$ is found to be independent of $$\epsilon$$ at the 1.5% level, while the $$\epsilon$$ dependence of $$P_\ell$$ shows an enhancement of $$(2.3 \pm 0.6) %$$ relative to the Born approximation at large $$\epsilon$$.

Published
2011

26. 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

27. Recoil Polarization Measurements of the Proton Electromagnetic Form Factor Ratio toQ2=8.5 GeV2

Author

Y. Matulenko, Ronald Gilman, S. A. Wood, M. Veilleux, L. Solovyev, H. Mkrtchyan, Douglas Higinbotham, M. K. Jones, N. M. Piskunov, E. Jensen, M. Meziane, John Arrington, M. Commisso, C. E. Keppel, Z. Ye, R. Subedi, A. Ahmidouch, F. R. Wesselmann, Emil Frlez, M. H. Shabestari, D. J. Margaziotis, Y. Zhang, Fatiha Benmokhtar, V. Kravtsov, I. Albayrak, Nuruzzaman, E. Tomasi-Gustafsson, Y. Prok, L. Pentchev, A. Asaturyan, L. Smykov, G. R. Smith, T. Horn, Bogdan Wojtsekhowski, S. Covrig, Ronald Ransome, W. Pierce, X. Zhang, S. P. Chernenko, S. Frullani, Dipangkar Dutta, D. S. Razin, Andrey Vasiliev, L. Bimbot, A. Marsh, James A. Miller, P. E. Reimer, P. Solvignon, E. Christy, D. G. Meekins, J. Huang, E. J. Brash, C. Butuceanu, P. M. King, J. Reinhold, A. Davidenko, I. Sitnik, H. Baghdasaryan, Amrendra Narayan, Simon Širca, G. M. Huber, F. Garibaldi, D. Gaskell, James Maxwell, W. U. Boeglin, William Bertozzi, Y. Goncharenko, Y. Li, C. F. Perdrisat, A. J. R. Puckett, David Hamilton, B. Moffit, X. Zheng, G. Mbianda, Shalev Gilad, J. C. Cornejo, D. Kirillov, A. Daniel, M. Khandaker, K. A. Aniol, G. Kumbartzki, W. Luo, J. Mulholland, H. C. Fenker, Yu.M. Mel'nik, L. Zhu, O. Rondon, A. Shahinyan, Donal Day, O. Moreno, Yu.V. Zanevsky, V. Mamyan, K. Shestermanov, Rolf Ent, S. Danagoulian, P. Bosted, S. Dhamija, B. Hu, Michael Kohl, S. Nedev, P. Carter, V. A. Punjabi, W. Hinton, E. Piasetzky, K. Hafidi, and A. Mkrtchyan

Subjects
Physics, Quark, Particle physics, Proton, Nuclear Theory, Hadron, Momentum transfer, Strong interaction, General Physics and Astronomy, Elementary particle, Nuclear physics, Recoil, Nuclear Experiment, Nucleon
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 GEp is accurately determined by more than 50%, these measurements will provide significant constraints on models of nucleon structure in the nonperturbative regime.

Published
2010

28. 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

29. QuasielasticHe3(e,e′p)H2Reaction atQ2=1.5 GeV2for Recoil Momenta up to1 GeV/c

Author

E. Voutier, R. A. Lindgren, Ronald Ransome, James J. Kelly, V. A. Punjabi, Bogdan Wojtsekhowski, A. Hotta, E. Chudakov, Olivier Gayou, Mauro Iodice, J. H. Mitchell, J. A. Templon, M. B. Epstein, X. Jiang, Z. Chai, W. U. Boeglin, B. Hu, Fatiha Benmokhtar, F. Sabatié, G. M. Urciuoli, R. Michaels, K. A. Aniol, D. J. Margaziotis, William Bertozzi, S. Malov, Pete Markowitz, E. Penel-Nottaris, A. Frahi-Amroun, J. LeRose, R. De Leo, J. S. Real, D. Simon, C. Furget, Kevin Fissum, J. M. Laget, J. C. Cornejo, J. Y. Mougey, Jian-Ping Chen, Nilanga Liyanage, K. Wijesooriya, J. R. Calarco, F. Garibaldi, H. Ueno, F. Merchez, C. F. Perdrisat, Arijit Saha, S. Frullani, C. Glashausser, W. Duran, E. Cisbani, R. Roche, M. Rvachev, P. E. Ulmer, Raphael Noel Tieulent, Sonja Dieterich, J. O. Hansen, P. Djawotho, Ronald Gilman, S. Strauch, C. C. Chang, R. Iomni, R. W. Lourie, Douglas Higinbotham, M. K. Jones, G. Quéméner, E. Liatard, M. Kuss, Tadaaki Tamae, S. Kox, R. Suleiman, J. M. Finn, Shalev Gilad, A. Cochran, C. W. de Jager, and F. Butaru

Subjects
Physics, 010308 nuclear & particles physics, media_common.quotation_subject, Nuclear Theory, Momentum transfer, General Physics and Astronomy, Electron, Few-body systems, 01 natural sciences, Asymmetry, Momentum, Nuclear physics, Cross section (physics), Recoil, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Wave function, media_common
Abstract

We have studied the quasielastic He-3(e,e(')p)H-2 reaction in perpendicular coplanar kinematics, with the energy and the momentum transferred by the electron fixed at 840 MeV and 1502 MeV/c, respectively. The He-3(e,e(')p)H-2 cross section was measured for missing momenta up to 1000 MeV/c, while the A(TL) asymmetry was extracted for missing momenta up to 660 MeV/c. For missing momenta up to 150 MeV/c, the cross section is described by variational calculations using modern He-3 wave functions. For missing momenta from 150 to 750 MeV/c, strong final-state interaction effects are observed. Near 1000 MeV/c, the experimental cross section is more than an order of magnitude larger than predicted by available theories. The A(TL) asymmetry displays characteristic features of broken factorization with a structure that is similar to that generated by available models.

Published
2005

30. Measurement of theHe3(e,e′p)pnReaction at High Missing Energies and Momenta

Author

H. Ueno, R. W. Lourie, C. C. Chang, G. Quéméner, R. Iomni, Bogdan Wojtsekhowski, A. Hotta, Douglas Higinbotham, M. K. Jones, X. Jiang, D. J. Margaziotis, E. Liatard, V. A. Punjabi, R. Roche, M. B. Epstein, Nilanga Liyanage, M. Kuss, P. E. Ulmer, William Bertozzi, A. Frahi-Amroun, Sonja Dieterich, F. Garibaldi, S. Strauch, R. A. Lindgren, J. J. LeRose, F. Merchez, A. Saha, Ronald Gilman, M. Rvachev, J. R. Calarco, Raphael Noel Tieulent, Shalev Gilad, C. W. de Jager, Christophe Furget, K. A. Aniol, Pete Markowitz, J. S. Real, E. Voutier, J. M. Finn, B. Hu, F. Sabatié, J. C. Cornejo, P. Djawotho, Ronald Ransome, Z. Chai, John C. Mitchell, J. Mougey, F. Butaru, J. A. Templon, E. Penel-Nottaris, E. Cisbani, R. De Leo, S. Malov, C. F. Perdrisat, S. Kox, J. P. Chen, R. Suleiman, G. M. Urciuoli, W. U. Boeglin, D. Simon, S. Frullani, A. Cochran, James J. Kelly, Mauro Iodice, Fatiha Benmokhtar, Charles Glashausser, Tadaaki Tamae, E. Chudakov, J. O. Hansen, Olivier Gayou, W. Duran, Kevin Fissum, J. M. Laget, K. Wijesooriya, and R. Michaels

Subjects
Physics, 010308 nuclear & particles physics, Nuclear Theory, Theoretical models, General Physics and Astronomy, Energy–momentum relation, 01 natural sciences, Omega, Nuclear physics, Pion, Density distribution, Helium-3, 0103 physical sciences, Nuclear Experiment, 010306 general physics
Abstract

Results of the Jefferson Lab Hall A quasielastic 3He(e,e'p)pn measurements are presented. These measurements were performed at fixed transferred momentum and energy, q=1502 MeV/c and omega=840 MeV, respectively, for missing momenta p(m) up to 1 GeV/c and missing energies in the continuum region, up to pion threshold; this kinematic coverage is much more extensive than that of any previous experiment. The cross section data are presented along with the effective momentum density distribution and compared to theoretical models.

Published
2005

31. Quasi elastic cross sections for the209Bi(e,e'p)208Pbreaction: Jefferson Lab experiment E06007

Author

K A Aniol, Joaquin L. Herraiz, J R Vignote, Arijit Saha, J. M. Udías, Alexandre Camsonne, J C Cornejo, and G Urciuoli

Subjects
Nuclear physics, Physics, History, Proton, Atomic physics, Orbit (control theory), Nuclear Experiment, Ground state, Computer Science Applications, Education
Abstract

6 pags., 4 figs., 1 tab. -- Rutherford Centennial Conference on Nuclear Physics 8–12 August 2011, Manchester, UK, Quasi elastic cross sections were measured for the first time for both negative and positive missing momenta for the 209Bi(e, e′p) 208P b reaction leading to the ground state and hole states of 208P b. Experimental cross sections obtained between -0.3 GeV/c to 0.3 GeV/c agree with theoretical calculations using RDWIA techniques both in shape and magnitude for the ground state. The data for the ground state production of 208P b are consistent with a theoretical model assuming a single proton(1.06 ± 0.10) in the 1h9/2 orbit in 209Bi.

Published
2012

32. Long-term enalapril and hydrochlorothiazide in radiation nephritis

Author

Luis I. Juncos, C A Broglia, S Carrasco Dueñas, H Cejas, and J C Cornejo

Subjects
Radiation Nephropathy, medicine.medical_specialty, Hypertension, Renal, Time Factors, medicine.medical_treatment, Urology, Blood Pressure, urologic and male genital diseases, Nephrectomy, Nephropathy, Hydrochlorothiazide, Enalapril, parasitic diseases, medicine, Animals, Kidney, Nephritis, business.industry, medicine.disease, Surgery, Rats, Radiation therapy, Radiation Injuries, Experimental, medicine.anatomical_structure, Diuretic, Complication, business, medicine.drug
Abstract

Radiation of the kidney often leads to renal failure. The contribution of arterial hypertension to the development of this complication is unclear. The aim of this study was to determine the renal effects of antihypertensive therapy in 1- and 2-kidney rat models of radiation nephritis. Five groups of Long Evans rats had X-irradiation of the left kidney. In groups 1 and 2, the right kidney was left undisturbed (2-kidney model). The rats in group 3, 4 and 5 underwent right nephrectomy 21 days before radiation (1-kidney model). Groups 1 and 3 received no drug treatment and served as controls for each model. Groups 2 and 4 had enalapril 50 mg/l in drinking water and group 5 hydrochlorothiazide (HCT) 200 mg/l, also in drinking water. Blood pressure increased significantly in both control groups and remained normal throughout the study in all treated groups. At the end of the study, mean urinary protein excretion was lower in the two enalapril-treated groups but not in HCT-treated animals. Groups 1 and 2 (2-kidney models) showed similar increments in plasma creatinine (PCreat), and, in both groups, the creatinine clearance (CCreat) dropped to the same extent. Among nephrectomized animals (1-kidney model), PCreat was lower and CCreat higher in the enalapril-treated group. Consistent with these findings, glomerular sclerosis was less severe in both enalapril-treated groups. We conclude that, in radiation nephritis, lowering blood pressure with enalapril exerts a beneficial effect on renal function and structure, whereas a similar reduction in blood pressure induced by HCT does not.

Published
1993

33. The effect of upright tilt on nifedipine-induced natriuresis

Author

J C Cornejo, C Villafane, L I Juncos, and R Escalante

Subjects
Adult, Male, medicine.medical_specialty, Supine position, Nifedipine, medicine.medical_treatment, Posture, Natriuresis, Blood Pressure, Vasodilation, Plasma renin activity, Internal medicine, Internal Medicine, medicine, Humans, Chemistry, Middle Aged, Mean blood pressure, Endocrinology, Renal blood flow, Female, Vascular Resistance, Diuretic, medicine.drug
Abstract

Calcium channel blockers are antihypertensive agents with diuretic actions. Yet edema occurs in some patients receiving long-term treatment with these drugs. As with other vasodilators, stimulation for fluid retention could result from systemic vasodilation. We speculated that the upright posture could enhance sodium retention. To test this hypothesis, we studied the effect of upright tilt in 10 patients before and after the oral administration of 20 mg nifedipine. Before nifedipine upright tilt caused a 41% drop in the sodium excretion rate, from 0.27 +/- 0.04 to 0.16 +/- 0.03 meq/min (p less than 0.05). Fractional sodium excretion decreased by 46%, from 2.4 +/- 0.5 to 1.3 +/- 0.3% (p less than 0.01). Urinary volume and renal plasma flow also decreased (p less than 0.05). Plasma renin activity (PRA) rose by 46% (p less than 0.005). With the patients in the supine posture nifedipine increased the sodium excretion rate to 0.49 +/- 0.09 meq/min (p less than 0.05). Fractional sodium excretion was 3.1 +/- 0.6 meq/min (p = 0.2). The natriuresis took place despite a fall in mean blood pressure and a significant rise in PRA (up 115% from prenifedipine supine values, p less than 0.005). Renal plasma flow also increased (p less than 0.01). The upright tilt caused a reversal of the nifedipine-induced natriuresis. The sodium excretion rate dropped to 0.23 +/- 0.05 meq/min and fractional sodium excretion to 1.3 +/- 0.2% (both not different from control). This drop in natriuresis occurred while mean blood pressure was at its lowest and PRA was 254% above the initial levels (p less than 0.005).(ABSTRACT TRUNCATED AT 250 WORDS)

Published
1992

34. Mechanisms of hypertension in renal radiation

Author

H Cejas, J C Cornejo, Luis I. Juncos, and C A Broglia

Subjects
medicine.medical_specialty, medicine.medical_treatment, Kidney Glomerulus, Drinking, Renal function, Natriuresis, Blood Pressure, Kidney, Plasma renin activity, Nephrectomy, chemistry.chemical_compound, Internal medicine, Renin–angiotensin system, Renin, Internal Medicine, medicine, Animals, Creatinine, Sclerosis, business.industry, Glomerulosclerosis, Rats, Inbred Strains, medicine.disease, Creatine, Biomechanical Phenomena, Rats, Radiation Injuries, Experimental, Endocrinology, medicine.anatomical_structure, chemistry, Hypertension, business, Saralasin, Glomerular Filtration Rate
Abstract

This study was undertaken to investigate the role played by renal functional and structural changes in the development of radiation-induced hypertension. Four groups of rats were studied: 1) left kidney radiated, 2) sham procedure, 3) uninephrectomy followed 3 weeks later by radiation of the contralateral kidney, and 4) uninephrectomy followed by sham procedure 3 weeks later. All radiated rats became hypertensive at 12 weeks (p less than 0.05) and had higher protein excretion (p less than 0.05). In the presence of an intact contralateral kidney, radiation causes mild-to-moderate histological abnormalities, and therefore, creatinine clearance and water and sodium handling do not change. Plasma renin activity increased in this group (p less than 0.05). Radiated uninephrectomized rats showed decreased creatinine clearance (p less than 0.05), but renin activity remained unchanged. These rats developed severe histological abnormalities in glomeruli, interstitia, tubuli, and vessels resulting in increased sodium and water output. The average of individual tubular and interstitial scores correlated significantly with both water intake and output but not with sodium excretion. These studies suggest that in the presence of an intact kidney, renin is an important determinant in the development or maintenance of radiation hypertension, whereas in the absence of the contralateral kidney, severe histological changes and renal failure are prominent despite increased water intake and output. The more severe glomerular sclerosis and proteinuria in the latter model could be related to diminished renal mass.

Published
1990

37. The Hypotensive Action of Indapamide

Author

Ferrer Ci, J. C. Cornejo, and L. I. Juncos

Subjects
Blood pressure, Chemistry, In vivo, Sodium, Indapamide, Extracellular fluid, medicine, Diuresis, chemistry.chemical_element, Vasodilation, Pharmacology, Calcium, medicine.drug
Abstract

Three main theories have been advanced to explain the antihypertensive action of diuretics. The first two are related to their sodium depleting effects; that is, blood pressure lowering results from a reduction in extracellular fluid volumen or in the water, sodium and calcium content of the arterioles. The third theory states that some diuretics maintain their chronic hypotensive action through a direct vasodilator effect. As far as thiazides are concerned, numerous studies have shown such action is dependant on a significant diuresis (1–2). It has been stated that Indapamide excerts its hypotensive action by means of a calcium blocking effect. (3) However, it has not been shown that a vasodilator effect “in vivo” is not dependant on sodium depletion.

Published
1987

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