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1. Measurements of the separated longitudinal structure function FL from hydrogen and deuterium targets at low Q2

Author

Tvaskis, V, Tvaskis, A, Niculescu, I, Abbott, D, Adams, GS, Afanasev, A, Ahmidouch, A, Angelescu, T, Arrington, J, Asaturyan, R, Avery, S, Baker, OK, Benmouna, N, Berman, BL, Biselli, A, Blok, HP, Boeglin, WU, Bosted, PE, Brash, E, Breuer, H, Chang, G, Chant, N, Christy, ME, Connell, SH, Dalton, MM, Danagoulian, S, Day, D, Dodario, T, Dunne, JA, Dutta, D, El Khayari, N, Ent, R, Fenker, HC, Frolov, VV, Gaskell, D, Garrow, K, Gilman, R, Gueye, P, Hafidi, K, Hinton, W, Holt, RJ, Horn, T, Huber, GM, Jackson, H, Jiang, X, Jones, MK, Joo, K, Kelly, JJ, Keppel, CE, Kuhn, J, Kinney, E, Klein, A, Kubarovsky, V, Liang, Y, Lolos, G, Lung, A, Mack, D, Malace, S, Markowitz, P, Mbianda, G, McGrath, E, McKee, D, Meekins, DG, Mkrtchyan, H, Napolitano, J, Navasardyan, T, Niculescu, G, Nozar, M, Ostapenko, T, Papandreou, Z, Potterveld, D, Reimer, PE, Reinhold, J, Roche, J, Rock, SE, Schulte, E, Segbefia, E, Smith, C, Smith, GR, Stoler, P, Tadevosyan, V, Tang, L, Telfeyan, J, Todor, L, Ungaro, M, Uzzle, A, Vidakovic, S, Villano, A, Vulcan, WF, Warren, G, Wesselmann, F, Wojtsekhowski, B, Wood, SA, Yan, C, and Zihlmann, B

Abstract

Structure functions, as measured in lepton-nucleon scattering, have proven to be very useful in studying the partonic dynamics within the nucleon. However, it is experimentally difficult to separately determine the longitudinal and transverse structure functions, and consequently there are substantially less data available in particular for the longitudinal structure function. Here, we present separated structure functions for hydrogen and deuterium at low four-momentum transfer squared, Q2

Published
2018

2. Measurements of the Separated Longitudinal Structure Function F_L from Hydrogen and Deuterium Targets at Low Q^2

Author

Tvaskis, V., Tvaskis, A., Niculescu, I., Abbott, D., Adams, G. S., Afanasev, A., Ahmidouch, A., Angelescu, T., Arrington, J., Asaturyan, R., Avery, S., Baker, O. K., Benmouna, N., Berman, B. L., Biselli, A., Blok, H. P., Boeglin, W. U., Bosted, P. E., Brash, E., Breuer, H., Chang, G., Chant, N., Christy, M. E., Connell, S. H., Dalton, M. M., Danagoulian, S., Day, D., Dodario, T., Dunne, J. A., Dutta, D., Khayari, N. El, Ent, R., Fenker, H. C., Frolov, V. V., Gaskell, D., Garrow, K., Gilman, R., Gueye, P., Hafidi, K., Hinton, W., Holt, R. J., Horn, T., Huber, G. M., Jackson, H., Jiang, X., Jones, M. K., Joo, K., Kelly, J. J., Keppel, C. E., Kuhn, J., Kinney, E., Klein, A., Kubarovsky, V., Liang, M., Liang, Y., Lolos, G., Lung, A., Mack, D., Malace, S., Markowitz, P., Mbianda, G., McGrath, E., Mckee, D., McKee, P., Meekins, D. G., Mkrtchyan, H., Moziak, B., Napolitano, J., Navasardyan, T., Niculescu, G., Nozar, M., Ostapenko, T., Papandreou, Z., Potterveld, D., Reimer, P. E., Reinhold, J., Roche, J., Rock, S. E., Schulte, E., Segbefia, E., Smith, C., Smith, G. R., Stoler, P., Tadevosyan, V., Tang, L., Telfeyan, J., Todor, L., Ungaro, M., Uzzle, A., Vidakovic, S., Villano, A., Vulcan, W. F., Wang, M., Warren, G., Wesselmann, F., Wojtsekhowski, B., Wood, S. A., Xu, C., Yan, C., Yuan, L., Zheng, X., Zihlmann, B., and Zhu, H.

Subjects
Nuclear Experiment, High Energy Physics - Experiment
Abstract

Structure functions, as measured in lepton-nucleon scattering, have proven to be very useful in studying the quark dynamics within the nucleon. However, it is experimentally difficult to separately determine the longitudinal and transverse structure functions, and consequently there are substantially less data available for the longitudinal structure function in particular. Here we present separated structure functions for hydrogen and deuterium at low four--momentum transfer squared, Q^2< 1 GeV^2, and compare these with parton distribution parameterizations and a k_T factorization approach. While differences are found, the parameterizations generally agree with the data even at the very low Q^2 scale of the data. The deuterium data show a smaller longitudinal structure function, and smaller ratio of longitudinal to transverse cross section R, than the proton. This suggests either an unexpected difference in R for the proton and neutron or a suppression of the gluonic distribution in nuclei., Comment: 11 pages, 7 figures, 2 data tables

Published
2016
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3. Separated Response Functions in Exclusive, Forward $\pi^{\pm}$ Electroproduction on Deuterium

Author

Huber, G. M., Blok, H. P., Butuceanu, C., Gaskell, D., Horn, T., Mack, D. J., Abbott, D., Aniol, K., Anklin, H., Armstrong, C., Arrington, J., Assamagan, K., Avery, S., Baker, O. K., Barrett, B., Beise, E. J., Bochna, C., Boeglin, W., Brash, E. J., Breuer, H., Chang, C. C., Chant, N., Christy, M. E., Dunne, J., Eden, T., Ent, R., Fenker, H., Gibson, E. F., Gilman, R., Gustafsson, K., Hinton, W., Holt, R. J., Jackson, H., Jin, S., Jones, M. K., Keppel, C. E., Kim, P. H., Kim, W., King, P. M., Klein, A., Koltenuk, D., Kovaltchouk, V., Liang, M., Liu, J., Lolos, G. J., Lung, A., Margaziotis, D. J., Markowitz, P., Matsumura, A., McKee, D., Meekins, D., Mitchell, J., Miyoshi, T., Mkrtchyan, H., Mueller, B., Niculescu, G., Niculescu, I., Okayasu, Y., Pentchev, L., Perdrisat, C., Pitz, D., Potterveld, D., Punjabi, V., Qin, L. M., Reimer, P. E., Reinhold, J., Roche, J., Roos, P. G., Sarty, A., Shin, I. K., Smith, G. R., Stepanyan, S., Tang, L. G., Tadevosyan, V., Tvaskis, V., van der Meer, R. L. J., Vansyoc, K., Van Westrum, D., Vidakovic, S., Volmer, J., Vulcan, W., Warren, G., Wood, S. A., Xu, C., Yan, C., Zhao, W. -X., Zheng, X., Zihlmann, B., and Collaboration, The Jefferson Lab Fpi

Subjects
Nuclear Experiment
Abstract

Background: Measurements of forward exclusive meson production at different squared four-momenta of the exchanged virtual photon, $Q^2$, and at different four-momentum transfer, t, can be used to probe QCD's transition from meson-nucleon degrees of freedom at long distances to quark-gluon degrees of freedom at short scales. Ratios of separated response functions in $\pi^-$ and $\pi^+$ electroproduction are particularly informative. The ratio for transverse photons may allow this transition to be more easily observed, while the ratio for longitudinal photons provides a crucial verification of the assumed pole dominance, needed for reliable extraction of the pion form factor from electroproduction data. Method: Data were acquired with 2.6-5.2 GeV electron beams and the HMS+SOS spectrometers in Jefferson Lab Hall C, at central $Q^2$ values of 0.6, 1.0, 1.6 GeV$^2$ at W=1.95 GeV, and $Q^2$=2.45 GeV$^2$ at W=2.22 GeV. There was significant coverage in $\phi$ and $\epsilon$, which allowed separation of $\sigma_{L,T,LT,TT}$. Results: $\sigma_L$ shows a clear signature of the pion pole, with a sharp rise at small -t. In contrast, $\sigma_T$ is much flatter versus t. The longitudinal/transverse ratios evolve with $Q^2$ and t, and at the highest $Q^2$=2.45 GeV$^2$ show a slight enhancement for $\pi^-$ production compared to $\pi^+$. The $\pi^-/\pi^+$ ratio for transverse photons exhibits only a small $Q^2$-dependence, following a nearly universal curve with t, with a steep transition to a value of about 0.25, consistent with s-channel quark knockout. The $\sigma_{TT}/\sigma_T$ ratio also drops rapidly with $Q^2$, qualitatively consistent with s-channel helicity conservation. The $\pi^-/\pi^+$ ratio for longitudinal photons indicates a small isoscalar contamination at W=1.95 GeV, consistent with what was observed in our earlier determination of the pion form factor at these kinematics., Comment: 25 pages, 16 figures, 6 tables

Published
2014
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4. Separated Response Function Ratios in Exclusive, Forward pi^{+/-} Electroproduction

Author

Huber, G. M., Blok, H. P., Butuceanu, C., Gaskell, D., Horn, T., Mack, D. J., Abbott, D., Aniol, K., Anklin, H., Armstrong, C., Arrington, J., Assamagan, K., Avery, S., Baker, O. K., Barrett, B., Beise, E. J., Bochna, C., Boeglin, W., Brash, E. J., Breuer, H., Chang, C. C., Chant, N., Christy, M. E., Dunne, J., Eden, T., Ent, R., Fenker, H., Gibson, E. F., Gilman, R., Gustafsson, K., Hinton, W., Holt, R. J., Jackson, H., Jin, S., Jones, M. K., Keppel, C. E., Kim, P. H., Kim, W., King, P. M., Klein, A., Koltenuk, D., Kovaltchouk, V., Liang, M., Liu, J., Lolos, G. J., Lung, A., Margaziotis, D. J., Markowitz, P., Matsumura, A., McKee, D., Meekins, D., Mitchell, J., Miyoshi, T., Mkrtchyan, H., Mueller, B., Niculescu, G., Niculescu, I., Okayasu, Y., Pentchev, L., Perdrisat, C., Pitz, D., Potterveld, D., Punjabi, V., Qin, L. M., Reimer, P. E., Reinhold, J., Roche, J., Roos, P. G., Sarty, A., Shin, I. K., Smith, G. R., Stepanyan, S., Tang, L. G., Tadevosyan, V., Tvaskis, V., van der Meer, R. L. J., Vansyoc, K., Van Westrum, D., Vidakovic, S., Volmer, J., Vulcan, W., Warren, G., Wood, S. A., Xu, C., Yan, C., Zhao, W. -X., Zheng, X., and Zihlmann, B.

Subjects
Nuclear Experiment
Abstract

The study of exclusive $\pi^{\pm}$ electroproduction on the nucleon, including separation of the various structure functions, is of interest for a number of reasons. The ratio $R_L=\sigma_L^{\pi^-}/\sigma_L^{\pi^+}$ is sensitive to isoscalar contamination to the dominant isovector pion exchange amplitude, which is the basis for the determination of the charged pion form factor from electroproduction data. A change in the value of $R_T=\sigma_T^{\pi^-}/\sigma_T^{\pi^+}$ from unity at small $-t$, to 1/4 at large $-t$, would suggest a transition from coupling to a (virtual) pion to coupling to individual quarks. Furthermore, the mentioned ratios may show an earlier approach to pQCD than the individual cross sections. We have performed the first complete separation of the four unpolarized electromagnetic structure functions above the dominant resonances in forward, exclusive $\pi^{\pm}$ electroproduction on the deuteron at central $Q^2$ values of 0.6, 1.0, 1.6 GeV$^2$ at $W$=1.95 GeV, and $Q^2=2.45$ GeV$^2$ at $W$=2.22 GeV. Here, we present the $L$ and $T$ cross sections, with emphasis on $R_L$ and $R_T$, and compare them with theoretical calculations. Results for the separated ratio $R_L$ indicate dominance of the pion-pole diagram at low $-t$, while results for $R_T$ are consistent with a transition between pion knockout and quark knockout mechanisms., Comment: 6 pages, 3 figures

Published
2014
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5. The G0 Experiment: Apparatus for Parity-Violating Electron Scattering Measurements at Forward and Backward Angles

Author

G0 Collaboration, Androic, D., Armstrong, D. S., Arvieux, J., Asaturyan, R., Averett, T. D., Bailey, S. L., Batigne, G., Beck, D. H., Beise, E. J., Benesch, J., Benmokhtar, F., Bimbot, L., Birchall, J., Biselli, A., Bosted, P., Breuer, H., Brindza, P., Capuano, C. L., Carlini, R. D., Carr, R., Chant, N., Chao, Y. -C., Clark, R., Coppens, A., Covrig, S. D., Cowley, A., Dale, D., Davis, C. A., Ellis, C., Falk, W. R., Fenker, H., Finn, J. M., Forest, T., Franklin, G., Frascaria, R., Furget, C., Gaskell, D., Gericke, M. T. W., Grames, J., Griffioen, K. A., Grimm, K., Guillard, G., Guillon, B., Guler, H., Gustafsson, K., Hannelius, L., Hansknecht, J., Hasty, R. D., Allen, A. M. Hawthorne, Horn, T., Ito, T. M., Johnston, K., Jones, M., Kammel, P., Kazimi, R., King, P. M., Kolarkar, A., Korkmaz, E., Korsch, W., Kox, S., Kuhn, J., Lachniet, J., Laszewski, R., Lee, L., Lenoble, J., Liatard, E., Liu, J., Lung, A., MacLachlan, G. A., Mammei, J., Marchand, D., Martin, J. W., Mack, D. J., McFarlane, K. W., McKee, D. W., McKeown, R. D., Merchez, F., Mihovilovic, M., Micherdzinska, A., Mkrtchyan, H., Moffit, B., Morlet, M., Muether, M., Musson, J., Nakahara, K., Neveling, R., Niccolai, S., Nilsson, D., Ong, S., Page, S. A., Papavassiliou, V., Pate, S. F., Phillips, S. K., Pillot, P., Pitt, M. L., Poelker, M., Porcelli, T. A., Quemener, G., Quinn, B. P., Ramsay, W. D., Rauf, A. W., Real, J. -S., Ries, T., Roos, J. Roche P., Rutledge, G. A., Schaub, J., Secrest, J., Seva, T., Simicevic, N., Smith, G. R., Spayde, D. T., Stepanyan, S., Stutzman, M., Suleiman, R., Tadevosyan, V., Tieulent, R., van de Wiele, J., van Oers, W. T. H., Versteegen, M., Voutier, E., Vulcan, W. F., Wells, S. P., Warren, G., Williamson, S. E., Woo, R. J., Wood, S. A., Yan, C., Yun, J., and Zeps, V.

Subjects
Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract

In the G0 experiment, performed at Jefferson Lab, the parity-violating elastic scattering of electrons from protons and quasi-elastic scattering from deuterons is measured in order to determine the neutral weak currents of the nucleon. Asymmetries as small as 1 part per million in the scattering of a polarized electron beam are determined using a dedicated apparatus. It consists of specialized beam-monitoring and control systems, a cryogenic hydrogen (or deuterium) target, and a superconducting, toroidal magnetic spectrometer equipped with plastic scintillation and aerogel Cerenkov detectors, as well as fast readout electronics for the measurement of individual events. The overall design and performance of this experimental system is discussed., Comment: Submitted to Nuclear Instruments and Methods

Published
2011
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6. Cross sections and Rosenbluth separations in 1H(e, e'K+)Lambda up to Q2=2.35 GeV2

Author

Coman, M., Markowitz, P., Aniol, K. A., Baker, K., Boeglin, W. U., Breuer, H., Bydzovsky, P., Camsonne, A., Cha, J., Chang, C. C., Chant, N., Chen, J. -P., Chudakov, E. A., Cisbani, E., Cole, L., Cusanno, F., de Jager, C. W., De Leo, R., Deur, A. P., Dieterich, S., Dohrmann, F., Dutta, D., Ent, R., Filoti, O., Fissum, K., Frullani, S., Garibaldi, F., Gayou, O., Gilman, F., Gomez, J., Gueye, P., Hansen, J. O., Higinbotham, D. W., Hinton, W., Horn, T., Hu, B., Huber, G. M., Iodice, M., Jackson, C., Jiang, X., Jones, M., Kanda, K., Keppel, C., King, P., Klein, F., Kozlov, K., Kramer, K., Kramer, L., Lagamba, L., LeRose, J. J., Liyanage, N., Margaziotis, D. J., Marrone, S., McCormick, K., Michaels, R. W., Mitchell, J., Miyoshi, T., Nanda, S., Palomba, M., Pattichio, V., Perdrisat, C. F., Piasetzky, E., Punjabi, V. A., Raue, B., Reinhold, J., Reitz, B., Roche, R. E., Roos, P., Saha, A., Sarty, A. J., Sato, Y., Sirca, S., Sotona, M., Tang, L., Ueno, H., Ulmer, P. E., Urciuoli, G. M., Uzzle, A., Vacheret, A., Wang, K., Wijesooriya, K., Wojtsekhowski, B., Wood, S., Yaron, I., Zheng, X., and Zhu, L.

Subjects
Nuclear Experiment
Abstract

The kaon electroproduction reaction 1H(e,e'K+)Lambda was studied as a function of the virtual-photon four-momentum, Q2, total energy, W, and momentum transfer, t, for different values of the virtual- photon polarization parameter. Data were taken at electron beam energies ranging from 3.40 to 5.75 GeV. The center of mass cross section was determined for 21 kinematics corresponding to Q2 of 1.90 and 2.35 GeV2 and the longitudinal, sigmaL, and transverse, sigmaT, cross sections were separated using the Rosenbluth technique at fixed W and t. The separated cross sections reveal a flat energy dependence at forward kaon angles not satisfactorily described by existing electroproduction models. Influence of the kaon pole on the cross sections was investigated by adopting an off-shell form factor in the Regge model which better describes the observed energy dependence of sigmaT and sigmaL., Comment: 5 pages, 4 figures. Submitted to Physical Review C, Rapid Communications

Published
2009
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7. Charged pion form factor between $Q^2$=0.60 and 2.45 GeV$^2$. I. Measurements of the cross section for the ${^1}$H($e,e'\pi^+$)$n$ reaction

Author

Blok, H. P., Horn, T., Huber, G. M., Beise, E. J., Gaskell, D., Mack, D. J., Tadevosyan, V., Volmer, J., Abbott, D., Aniol, K., Anklin, H., Armstrong, C., Arrington, J., Assamagan, K., Avery, S., Baker, O. K., Barrett, B., Bochna, C., Boeglin, W., Brash, E. J., Breuer, H., Chang, C. C., Chant, N., Christy, M. E., Dunne, J., Eden, T., Ent, R., Fenker, H., Gibson, E., Gilman, R., Gustafsson, K., Hinton, W., Holt, R. J., Jackson, H., Jin, S., Jones, M. K., Keppel, C. E., Kim, P. H., Kim, W., King, P. M., Klein, A., Koltenuk, D., Kovaltchouk, V., Liang, M., Liu, J., Lolos, G. J., Lung, A., Margaziotis, D. J., Markowitz, P., Matsumura, A., McKee, D., Meekins, D., Mitchell, J., Miyoshi, T., Mkrtchyan, H., Mueller, B., Niculescu, G., Niculescu, I., Okayasu, Y., Pentchev, L., Perdrisat, C., Pitz, D., Potterveld, D., Punjabi, V., Qin, L. M., Reimer, P., Reinhold, J., Roche, J., Roos, P. G., Sarty, A., Shin, I. K., Smith, G. R., Stepanyan, S., Tang, L. G., Tvaskis, V., van der Meer, R. L. J., Vansyoc, K., Van Westrum, D., Vidakovic, S., Vulcan, W., Warren, G., Wood, S. A., Xu, C., Yan, C., Zhao, W. -X., Zheng, X., and Zihlmann, B.

Subjects
Nuclear Experiment
Abstract

Cross sections for the reaction ${^1}$H($e,e'\pi^+$)$n$ were measured in Hall C at Thomas Jefferson National Accelerator Facility (JLab) using the CEBAF high-intensity, continous electron beam in order to determine the charged pion form factor. Data were taken for central four-momentum transfers ranging from $Q^2$=0.60 to 2.45 GeV$^2$ at an invariant mass of the virtual photon-nucleon system of $W$=1.95 and 2.22 GeV. The measured cross sections were separated into the four structure functions $\sigma_L$, $\sigma_T$, $\sigma_{LT}$, and $\sigma_{TT}$. The various parts of the experimental setup and the analysis steps are described in detail, including the calibrations and systematic studies, which were needed to obtain high precision results. The different types of systematic uncertainties are also discussed. The results for the separated cross sections as a function of the Mandelstam variable $t$ at the different values of $Q^2$ are presented. Some global features of the data are discussed, and the data are compared with the results of some model calculations for the reaction ${^1}$H($e,e'\pi^+$)$n$., Comment: 26 pages, 23 figures

Published
2008
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8. Charged pion form factor between Q^2=0.60 and 2.45 GeV^2. II. Determination of, and results for, the pion form factor

Author

Huber, G. M., Blok, H. P., Horn, T., Beise, E. J., Gaskell, D., Mack, D. J., Tadevosyan, V., Volmer, J., Abbott, D., Aniol, K., Anklin, H., Armstrong, C., Arrington, J., Assamagan, K., Avery, S., Baker, O. K., Barrett, B., Bochna, C., Boeglin, W., Brash, E. J., Breuer, H., Chang, C. C., Chant, N., Christy, M. E., Dunne, J., Eden, T., Ent, R., Gibson, E., Gilman, R., Gustafsson, K., Hinton, W., Holt, R. J., Jackson, H., Jin, S., Jones, M. K., Keppel, C. E., Kim, P. H., Kim, W., King, P. M., Klein, A., Koltenuk, D., Kovaltchouk, V., Kiang, M., Liu, J., Lolos, G. J., Lung, A., Margaziotis, D. J., Markowitz, P., Matsumura, A., McKee, D., Meekins, D., Mitchell, J., Miyoshi, T., Mkrtchyan, H., Mueller, B., Niculescu, G., Niculescu, I., Okayasu, Y., Pentchev, L., Perdrisat, C., Pitz, D., Potterveld, D., Punjabi, V., Qin, L. M., Reimer, P., Reinhold, J., Roche, J., Roos, P. G., Sarty, A., Shin, I. K., Smith, G. R., Stepanyan, S., Tang, L. G., Tvaskis, V., van der Meer, R. L. J., Vansyoc, K., Van Westrum, D., Vidakovic, S., Vulcan, W., Warren, G., Wood, S. A., Xu, C., Yan, C., Zhao, W. -X., Zheng, X., and Zihlmann, B.

Subjects
Nuclear Experiment
Abstract

The charged pion form factor, Fpi(Q^2), is an important quantity which can be used to advance our knowledge of hadronic structure. However, the extraction of Fpi from data requires a model of the 1H(e,e'pi+)n reaction, and thus is inherently model dependent. Therefore, a detailed description of the extraction of the charged pion form factor from electroproduction data obtained recently at Jefferson Lab is presented, with particular focus given to the dominant uncertainties in this procedure. Results for Fpi are presented for Q^2=0.60-2.45 GeV^2. Above Q^2=1.5 GeV^2, the Fpi values are systematically below the monopole parameterization that describes the low Q^2 data used to determine the pion charge radius. The pion form factor can be calculated in a wide variety of theoretical approaches, and the experimental results are compared to a number of calculations. This comparison is helpful in understanding the role of soft versus hard contributions to hadronic structure in the intermediate Q^2 regime., Comment: 18 pages, 11 figures

Published
2008
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9. Quasifree Lambda, Sigma^0, and Sigma^- electroproduction from 1,2H, 3,4He, and carbon

Author

Dohrmann, F., Ahmidouch, A., Armstrong, C. S., Arrington, J., Asaturyan, R., Avery, S., Bailey, K., Bitao, H., Breuer, H., Brown, D. S., Carlini, R., Cha, J., Chant, N., Christy, E., Cochran, A., Cole, L., Crowder, J., Danagoulian, S., Elaasar, M., Ent, R., Fenker, H., Fujii, Y., Gan, L., Garrow, K., Geesaman, D. F., Gueye, P., Hafidi, K., Hinton, W., Juengst, H., Keppel, C., Liang, Y., Liu, J. H., Lung, A., Mack, D., Markowitz, P., Mitchell, J., Miyoshi, T., Mkrtchyan, H., Mtingwa, S. K., Mueller, B., Niculescu, G., Niculescu, I., Potterveld, D., Raue, B. A., Reimer, P. E., Reinhold, J., Roche, J., Sarsour, M., Sato, Y., Segel, R. E., Semenov, A., Stepanyan, S., Tadevosyan, V., Tajima, S., Tang, L., Uzzle, A., Wood, S., Yamaguchi, H., Yan, C., Yuan, L., Zeidman, B., Zeier, M., and Zihlmann, B.

Subjects
Nuclear Experiment
Abstract

Kaon electroproduction from light nuclei and hydrogen, using 1H, 2H, 3He, 4He, and Carbon targets has been measured at Jefferson Laboratory. The quasifree angular distributions of Lambda and Sigma hyperons were determined at Q^2= 0.35(GeV/c)^2 and W= 1.91GeV. Electroproduction on hydrogen was measured at the same kinematics for reference., Comment: 34 pages, 9 figures v2:minor grammatical changes, correcting typos

Published
2007
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10. Determination of the pion charge form factor for Q^2=0.60-1.60 GeV^2

Author

collaboration, The Fpi-1, Tadevosyan, V., Blok, H. P., Huber, G. M., Abbott, D., Anklin, H., Armstrong, C., Arrington, J., Assamagan, K., Avery, S., Baker, O. K., Bochna, C., Brash, E. J., Breuer, H., Chant, N., Dunne, J., Eden, T., Ent, R., Gaskell, D., Gilman, R., Gustafsson, K., Hinton, W., Jackson, H., Jones, M. K., Keppel, C., Kim, P. H., Kim, W., Klein, A., Koltenuk, D., Liang, M., Lolos, G. J., Lung, A., Mack, D. J., McKee, D., Meekins, D., Mitchell, J., Mkrtchyan, H., Mueller, B., Niculescu, G. Niculescu I., Pitz, D., Potterveld, D., Qin, L. M., Reinhold, J., Shin, I. K., Stepanyan, S., Tang, L. G., van der Meer, R. L. J., Vansyoc, K., Van Westrum, D., Volmer, J., Vulcan, W., Wood, S., Yan, C., Zhao, W. -X., and Zihlmann, B.

Subjects
Nuclear Experiment
Abstract

The data analysis for the reaction H(e,e' pi^+)n, which was used to determine values for the charged pion form factor Fpi for values of Q^2=0.6-1.6 GeV^2, has been repeated with careful inspection of all steps and special attention to systematic uncertainties. Also the method used to extract Fpi from the measured longitudinal cross section was critically reconsidered. Final values for the separated longitudinal and transverse cross sections and the extracted values of Fpi are presented., Comment: 11 pages, 6 figures

Published
2006
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11. Measurement of R = sigma_L / sigma_T and the Separated Longitudinal and Transverse Structure Functions in the Nucleon Resonance Region

Author

Collaboration, The Jefferson Lab Hall C E94-110, Liang, Y., Tvaskis, V., Christy, M. E., Ahmidouch, A., Armstrong, C. S., Arrington, J., Asaturyan, R., Avery, S., Baker, O. K., Beck, D. H., Blok, H. P., Bochna, C. W., Boeglin, W., Bosted, P., Bouwhuis, M., Breuer, H., Brown, D. S., Bruell, A., Carlini, R. D., Cha, J., Chant, N. S., Cochran, A., Cole, L., Danagoulian, S., Day, D. B., Dunne, J., Dutta, D., Ent, R., Fenker, H. C., Fox, B., Gan, L., Gao, H., Garrow, K., Gaskell, D., Gasparian, A., Geesaman, D. F., Gilman, R., Gu`eye, P. L. J., Harvey, M., Holt, R. J., Jiang, X., Jones, M., Keppel, C. E., Kinney, E., Lorenzon, W., Lung, A., Mack, D. J., Markowitz, P., Martin, J. W., McIlhany, K., McKee, D., Meekins, D., Miller, M. A., Milner, R. G., Mitchell, J. H., Mkrtchyan, H., Mueller, B. A., Nathan, A., Niculescu, G., Niculescu, I., O'Neill, T. G., Papavassiliou, V., Pate, S. F., Piercey, R. B., Potterveld, D., Ransome, R. D., Reinhold, J., Rollinde, E., Rondon, O., Roos, P., Sarty, A. J., Sawafta, R., Schulte, E. C., Segbefia, E., Smith, C., Stepanyan, S., Strauch, S., Tadevosyan, V., Tang, L., Tieulent, R., Uzzle, A., Vulcan, W. F., Wood, S. A., Xiong, F., Yuan, L., Zeier, M., Zihlmann, B., and Ziskin, V.

Subjects
Nuclear Experiment
Abstract

We report on a detailed study of longitudinal strength in the nucleon resonance region, presenting new results from inclusive electron-proton cross sections measured at Jefferson Lab Hall C in the four-momentum transfer range 0.2 < Q^2 < 5.5 GeV^2. The data have been used to accurately perform 167 Rosenbluth-type longitudinal / transverse separations. The precision R = sigma_L / sigma_T data are presented here, along with the first separate values of the inelastic structure functions F_1 and F_L in this regime. The resonance longitudinal component is found to be significant, both in magnitude and in the existence of defined mass peaks. Additionally, quark-hadron duality is here observed above Q^2 = 1 GeV^2 in the separated structure functions independently., Comment: 5 pages, 4 figures

Published
2004

12. Measurement of R=σL/σT and the separated longitudinal and transverse structure functions in the nucleon-resonance region

Author

Liang, Y., Tvaskis, V., Christy, M. E., Ahmidouch, A., Armstrong, C. S., Arrington, J., Asaturyan, R., Avery, S., Baker, O. K., Beck, D. H., Blok, H. P., Bochna, C. W., Boeglin, W., Bosted, P., Bouwhuis, M., Breuer, H., Brown, D. S., Bruell, A., Carlini, R. D., Cha, J., Chant, N. S., Cochran, A., Cole, L., Danagoulian, S., Day, D. B., Dunne, J., Dutta, D., Ent, R., Fenker, H. C., Fox, B., Gan, L., Gao, H., Garrow, K., Gaskell, D., Gasparian, A., Geesaman, D. F., Gilman, R., Guèye, P. L.J., Harvey, M., Holt, R. J., Jiang, X., Jones, M., Keppel, C. E., Kinney, E., Lorenzon, W., Lung, A., Mack, D. J., Markowitz, P., Martin, J. W., Mcilhany, K., Mckee, D., Meekins, D., Miller, M. A., Milner, R. G., Mitchell, J. H., Mkrtchyan, H., Mueller, B. A., Nathan, A., Niculescu, G., Niculescu, I., O'neill, T. G., Papavassiliou, V., Pate, S. F., Piercey, R. B., Potterveld, D., Ransome, R. D., Reinhold, J., Rollinde, E., Rondon, O., Roos, P., Sarty, A. J., Sawafta, R., Schulte, E. C., Segbefia, E., Smith, C., Stepanyan, S., Strauch, S., Tadevosyan, V., Tang, L., Tieulent, R., Uzzle, A., Vulcan, W. F., Wood, S. A., Xiong, F., Yuan, L., Zeier, M., Zihlmann, B., Ziskin, V., and Student Lab and Education

Subjects
Particle and Plasma Physics, Molecular, Nuclear, Atomic, Nuclear & Particles Physics
Abstract

We report on a detailed study of longitudinal strength in the nucleon resonance region, presenting new results from inclusive electron-proton cross sections measured at Jefferson Lab Hall C in the four-momentum transfer range 0.2

Published
2022

13. The G0 experiment: Apparatus for parity-violating electron scattering measurements at forward and backward angles

Author

Androić, D., Armstrong, D.S., Arvieux, J., Asaturyan, R., Averett, T.D., Bailey, S.L., Batigne, G., Beck, D.H., Beise, E.J., Benesch, J., Benmokhtar, F., Bimbot, L., Birchall, J., Biselli, A., Bosted, P., Breuer, H., Brindza, P., Capuano, C.L., Carlini, R.D., Carr, R., Chant, N., Chao, Y.-C., Clark, R., Coppens, A., Covrig, S.D., Cowley, A., Dale, D., Davis, C.A., Ellis, C., Falk, W.R., Fenker, H., Finn, J.M., Forest, T., Franklin, G., Frascaria, R., Furget, C., Gaskell, D., Gericke, M.T.W., Grames, J., Griffioen, K.A., Grimm, K., Guillard, G., Guillon, B., Guler, H., Gustafsson, K., Hannelius, L., Hansknecht, J., Hasty, R.D., Hawthorne Allen, A.M., Horn, T., Ito, T.M., Johnston, K., Jones, M., Kammel, P., Kazimi, R., King, P.M., Kolarkar, A., Korkmaz, E., Korsch, W., Kox, S., Kuhn, J., Lachniet, J., Laszewski, R., Lee, L., Lenoble, J., Liatard, E., Liu, J., Lung, A., MacLachlan, G.A., Mammei, J., Marchand, D., Martin, J.W., Mack, D.J., McFarlane, K.W., McKee, D.W., McKeown, R.D., Merchez, F., Mihovilovic, M., Micherdzinska, A., Mkrtchyan, H., Moffit, B., Morlet, M., Muether, M., Musson, J., Nakahara, K., Neveling, R., Niccolai, S., Nilsson, D., Ong, S., Page, S.A., Papavassiliou, V., Pate, S.F., Phillips, S.K., Pillot, P., Pitt, M.L., Poelker, M., Porcelli, T.A., Quéméner, G., Quinn, B.P., Ramsay, W.D., Rauf, A.W., Real, J.-S., Ries, T., Roche, J., Roos, P., Rutledge, G.A., Schaub, J., Secrest, J., Seva, T., Simicevic, N., Smith, G.R., Spayde, D.T., Stepanyan, S., Stutzman, M., Suleiman, R., Tadevosyan, V., Tieulent, R., van de Wiele, J., van Oers, W.T.H., Versteegen, M., Voutier, E., Vulcan, W.F., Wells, S.P., Warren, G., Williamson, S.E., Woo, R.J., Wood, S.A., Yan, C., Yun, J., and Zeps, V.

Published
2011
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14. Measurements of the separated longitudinal structure function FL from hydrogen and deuterium targets at low Q2

Author

Tvaskis, V., Tvaskis, A., Niculescu, I., Abbott, D., Adams, G. S., Afanasev, A., Ahmidouch, A., Angelescu, T., Arrington, J., Asaturyan, R., Avery, S., Baker, O. K., Benmouna, N., Berman, B. L., Biselli, A., Blok, H. P., Boeglin, W. U., Bosted, P. E., Brash, E., Breuer, H., Chang, G., Chant, N., Christy, M. E., Connell, S. H., Dalton, M. M., Danagoulian, S., Day, D., Dodario, T., Dunne, J. A., Dutta, D., El Khayari, N., Ent, R., Fenker, H. C., Frolov, V. V., Gaskell, D., Garrow, K., Gilman, R., Gueye, P., Hafidi, K., Hinton, W., Holt, R. J., Horn, T., Huber, G. M., Jackson, H., Jiang, X., Jones, M. K., Joo, K., Kelly, J. J., Keppel, C. E., Kuhn, J., and Student Lab and Education

Subjects
Nuclear Experiment
Abstract

Structure functions, as measured in lepton-nucleon scattering, have proven to be very useful in studying the partonic dynamics within the nucleon. However, it is experimentally difficult to separately determine the longitudinal and transverse structure functions, and consequently there are substantially less data available in particular for the longitudinal structure function. Here, we present separated structure functions for hydrogen and deuterium at low four-momentum transfer squared, Q2

Published
2018

15. Electroproduction of kaons and light hypernuclei

Author

Reinhold, J., Abbott, D., Ahmidouch, A., Ambrozewicz, P., Armstrong, C.S., Arrington, J., Asaturyan, R., Assamagan, K., Avery, S., Bailey, K., Baker, O.K., Beedoe, S., Bitao, H., Boeglin, W., Breuer, H., Brown, D.S., Carlini, R., Cha, J., Chant, N., Christy, E., Cochran, A., Cole, L., Collins, G., Cothran, C., Crowder, J., Cummings, W.J., Danagoulian, S., Dohrmann, F., Duncan, F., Dunne, J., Dutta, D., Eden, T., Elaasar, M., Ent, R., Ewell, L., Fenker, H., Fortune, H.T., Fujii, Y., Gan, L., Gao, H., Garrow, K., Geesaman, D.F., Gueye, P., Gustafsson, K., Hafidi, K., Hansen, J.O., Hinton, W., Jackson, H.E., Juengst, H., Keppel, C., Klein, A., Koltenuk, D., Liang, Y., Liu, J.H., Lung, A., Mack, D., Madey, R., Markowitz, P., Martoff, C.J., Meekins, D., Mitchell, J., Miyoshi, T., Mkrtchyan, H., Mohring, R., Mtingwa, S.K., Mueller, B., O'Neill, T.G., Niculescu, G., Niculescu, I., Potterveld, D., Price, J.W., Raue, B.A., Reimer, P.E., Roche, J., Roos, P., Sarsour, M., Sato, Y., Savage, G., Sawafta, R., Schiffer, J.P., Segel, R.E., Semenov, A., Stepanyan, S., Tadevosian, V., Tajima, S., Tang, L., Terburg, B., Uzzle, A., Wood, S., Yamaguchi, H., Yan, C., Yuan, L., Zeidman, B., Zeier, M., and Zihlmann, B.

Published
2001
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16. Electroproduction of kaons on light nuclei

Author

Zeidman, B., Abbott, D., Ahmidouch, A., Ambrozewicz, P., Armstrong, C.S., Arrington, J., Asaturyan, R., Assamagan, K., Avery, S., Bailey, K., Baker, O.K., Beedoe, S., Bitao, H., Breuer, H., Brown, D.S., Carlini, R., Cha, J., Chant, N., Christy, E., Cochran, A., Cole, L., Collins, G., Cothran, C., Crowder, J., Cummings, W.J., Danagoulian, S., Dohrmann, F., Duncan, F., Dunne, J., Dutta, D., Eden, T., Elaasar, M., Ent, R., Ewell, L., Fenker, H., Fortune, H.T., Fujii, Y., Gan, L., Gao, H., Garrow, K., Geesaman, D.F., Gueye, P., Gustafsson, K., Hafidi, K., Hansen, J.O., Hinton, W., Jackson, H.E., Juengst, H., Keppel, C., Klein, A., Koltenuk, D., Liang, Y., Liu, J.H., Lung, A., Mack, D., Madey, R., Markowitz, P., Martoff, C.J., Meekins, D., Mitchell, J., Miyoshi, T., Mkrtchyan, H., Mohring, R., Mtingwa, S.K., Mueller, B., O'Neill, T.G., Niculescu, G., Niculescu, I., Potterveld, D., Price, J.W., Raue, B.A., Reimer, P.E., Reinhold, J., Roche, J., Roos, P., Sarsour, M., Sato, Y., Savage, G., Sawafta, R., Schiffer, J.P., Segel, R.E., Semenov, A., Stepanyan, S., Tadevosian, V., Tajima, S., Tang, L., Terburg, B., Uzzle, A., Wood, S., Yamaguchi, H., Yan, C., Yuan, L., Zeier, M., and Zihlmann, B.

Published
2001
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17. Fourier Transform of Spherically Averaged Momentum Densities

Author

Coplan, M. A., Chornay, D. J., Moore, J. H., Tossell, J. A., Chant, N. S., Berthier, G., editor, Dewar, M. J. S., editor, Fischer, H., editor, Fukui, K., editor, Hall, G. G., editor, Hartmann, H., editor, Jaffé, H. H., editor, Jortner, J., editor, Kutzelnigg, W., editor, Ruedenberg, K., editor, Scrocco, E., editor, Gianturco, F. A., editor, and Stefani, G., editor

Published
1984
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18. Cross sections and Rosenbluth separations in H1(e,e′K +)Λ up to Q2=2.35GeV2

Author

Coman, M, Markowitz, P, Aniol, K, Baker, K, Boeglin, W, Breuer, H, Bydẑovský, P, Camsonne, A, Cha, J, Chang, C, Chant, N, Chen, J, Chudakov, E, Cisbani, E, Cole, L, Cusanno, F, De Jager, C, De Leo, R, Deur, A, Dieterich, S, Dohrmann, F, Dutta, D, Ent, R, Filoti, O, and Fissum, K

Abstract

The kaon electroproduction reaction H1(e,e′K +)Λ was studied as a function of the virtual-photon four-momentum, Q2, total energy, W, and momentum transfer, t, for different values of the virtual-photon polarization parameter. Data were taken at electron beam energies ranging from 3.40 to 5.75GeV. The center of mass cross section was determined for twenty-one kinematics corresponding to Q2 of 1.90 and 2.35GeV2, and the longitudinal, σL, and transverse, σT, cross sections were separated using the Rosenbluth technique at fixed W and t. The separated cross sections reveal a flat energy dependence at forward kaon angles not satisfactorily described by existing electroproduction models. Influence of the kaon pole on the cross sections was investigated by adopting an off-shell form factor in the Regge model, which better describes the observed energy dependence of σT and σL. © 2010 The American Physical Society.

Published
2016

20. Cross sections and Rosenbluth separations in H1(e,e′K +)Λ up to Q2=2.35GeV2

Author

Coman, M, Markowitz, P, Aniol, KA, Baker, K, Boeglin, WU, Breuer, H, Bydẑovský, P, Camsonne, A, Cha, J, Chang, CC, Chant, N, Chen, J-P, Chudakov, EA, Cisbani, E, Cole, L, Cusanno, F, De Jager, CW, De Leo, R, Deur, AP, Dieterich, S, Dohrmann, F, Dutta, D, Ent, R, Filoti, O, Fissum, K, Frullani, S, Garibaldi, F, Gayou, O, Gilman, F, Gomez, J, Gueye, P, Hansen, JO, Higinbotham, DW, Hinton, W, Horn, T, Hu, B, Huber, GM, Iodice, M, Jackson, C, Jiang, X, Jones, M, Kanda, K, Keppel, C, King, P, Klein, F, Kozlov, K, Kramer, K, Kramer, L, Lagamba, L, Lerose, JJ, Liyanage, N, Margaziotis, DJ, Marrone, S, McCormick, K, Michaels, RW, Mitchell, J, Miyoshi, T, Nanda, S, Palomba, M, Pattichio, V, Perdrisat, CF, Piasetzky, E, Punjabi, VA, Raue, B, Reinhold, J, Reitz, B, Roche, RE, Roos, P, Saha, A, Sarty, AJ, Sato, Y, Airca, S, Sotona, M, Tang, L, Ueno, H, Ulmer, PE, Urciuoli, GM, Uzzle, A, Vacheret, A, Wang, K, Wijesooriya, K, Wojtsekhowski, B, Wood, S, Yaron, I, Zheng, X, and Zhu, L

Subjects
Nuclear Experiment
Abstract

The kaon electroproduction reaction H1(e,e′K +)Λ was studied as a function of the virtual-photon four-momentum, Q2, total energy, W, and momentum transfer, t, for different values of the virtual-photon polarization parameter. Data were taken at electron beam energies ranging from 3.40 to 5.75GeV. The center of mass cross section was determined for twenty-one kinematics corresponding to Q2 of 1.90 and 2.35GeV2, and the longitudinal, σL, and transverse, σT, cross sections were separated using the Rosenbluth technique at fixed W and t. The separated cross sections reveal a flat energy dependence at forward kaon angles not satisfactorily described by existing electroproduction models. Influence of the kaon pole on the cross sections was investigated by adopting an off-shell form factor in the Regge model, which better describes the observed energy dependence of σT and σL. © 2010 The American Physical Society.

Published
2010

21. Recoil Polarization Measurements for Neutral Pion Electroproduction at $Q^2$=1 (GeV/c)$^2$ Near the $\Delta$ Resonance

Author

Kelly, J.J., Gayou, O., E. Roché, R., Chai, Z., K. Jones, M., J. Sarty, A., Frullani, S., Aniol, K., J. Beise, E., Benmokhtar, F., Bertozzi, W., U. Boeglin, W., Botto, T., J. Brash, E., Breuer, H., Brown, E., Burtin, E., R. Calarco, J., Cavata, C., C. Chang, C., S. Chant, N., Chen, J.-P., Coman, M., Crovelli, D., De Leo, R., Dieterich, S., Escoffier, S., G. Fissum, K., Garde, V., Garibaldi, F., Georgakopoulos, S., Gilad, S., Gilman, R., Glashausser, C., Hansen, J.-O., W. Higinbotham, D., Hotta, A., M. Huber, G., Ibrahim, H., Iodice, M., W. De Jager, C., Jiang, X., Klimenko, A., Kozlov, A., Kumbartzki, G., Kuss, M., Lagamba, L., Laveissière, G., LeRose, J.J., A. Lindgren, R., Liyange, N., J. Lolos, G., W. Lourie, R., J. Margaziotis, D., Marie, F., Markowitz, P., McAleer, S., Meekins, D., Michaels, R., D. Milbrath, B., Mitchell, J., Nappa, J., Neyret, D., F. Perdrisat, C., Potokar, M., A. Punjabi, V., Pussieux, T., D. Ransome, R., G. Roos, P., Rvachev, M., Saha, A., Širca, S., Suleiman, R., Strauch, S., A. Templon, J., Todor, L., E. Ulmer, P., M. Urciuoli, G., B. Weinstein, L., Wijsooriya, K., Wojtsekhowski, B., Zheng, X., Zhu, L., Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and HALL A

Subjects
24.70.+s, 14.20.Gk, 13.60.Le, 13.40.Gp, FOS: Physical sciences, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

We measured angular distributions of differential cross section, beam analyzing power, and recoil polarization for neutral pion electroproduction at Q^2 = 1.0 (GeV/c)^2 in 10 bins of W across the Delta resonance. A total of 16 independent response functions were extracted, of which 12 were observed for the first time. Comparisons with recent model calculations show that response functions governed by real parts of interference products are determined relatively well near 1.232 GeV, but variations among models is large for response functions governed by imaginary parts and for both increases rapidly with W. We performed a nearly model-independent multipole analysis that adjusts complex multipoles with high partial waves constrained by baseline models. Parabolic fits to the W dependence of the multipole analysis around the Delta mass gives values for SMR = (-6.61 +/- 0.18)% and EMR = (-2.87 +/- 0.19)% that are distinctly larger than those from Legendre analysis of the same data. Similarly, the multipole analysis gives Re(S0+/M1+) = (+7.1 +/- 0.8)% at W=1.232 GeV, consistent with recent models, while the traditional Legendre analysis gives the opposite sign because its truncation errors are quite severe. Finally, using a unitary isobar model (UIM), we find that excitation of the Roper resonance is dominantly longitudinal with S1/2 = (0.05 +/- 0.01) GeV^(-1/2) at Q^2=1. The ReS0+ and ReE0+ multipoles favor pseudovector coupling over pseudoscalar coupling or a recently proposed mixed-coupling scheme, but the UIM does not reproduce the imaginary parts of 0+ multipoles well., Comment: 60 pages, 54 figures

Published
2007

22. Quasifree Lambda, Sigma0, and Sigma- electroproduction from 1,2H, 3,4 He, and Carbon

Author

Dohrmann, F., Ahmidouch, A., Armstrong, C. S., Arrington, J., Asaturyan, R., Avery, S., Bailey, K., Baker, O. K., Bitao, H., Breuer, H., Brown, D. S., Carlini, R., Cha, J., Chant, N., Christy, E., Cochran, A., Cole, L., Crowder, J., Danagoulian, S., Elaasar, M., Ent, R., Fenker, H., Fujii, Y., Gan, L., Garrow, K., Geesaman, D. F., Gueye, P., Hafidi, K., Hinton, W., Juengst, H., Keppel, C., Liang, Y., Liu, J. H., Lung, A., Mack, D., Markowitz, P., Mitchell, J., Miyoshi, T., Mkrtchyan, H., Mtingwa, S. K., Mueller, B., Niculescu, G., Niculescu, I., Potterveld, D. H., Raue, B. A., Reimer, P. E., Reinhold, J., Roche, J., Sarsour, M., Sato, Y., Segel, R. E., Semenov, A. Y., Stepanyan, S., Tadevosian, V., Tajima, S., Tang, L., Uzzle, A., Wood, S., Yamaguchi, H., Yan, C., Yuan, L., Zeier, M., Zeidman, B., and Zihlmann, B.

Subjects
Electroproduction of Strangeness, Nuclear Theory, Hypernuclear Physics, High Energy Physics::Experiment, Hyperons, Nuclear Experiment
Abstract

Kaon electroproduction from light nuclei and hydrogen, using 1H, 2H, 3He, 4He, and carbon targets has been measured at Jefferson Laboratory. The quasifree angular distributions of Lambda and Sigma hyperons were determined at Q^2= 0.35 (GeV/c)^2 and W= 1.91 GeV. Electroproduction on hydrogen was measured at the same kinematics for reference.

Published
2007

24. Electroproduction of Strangeness on 3,4λH bound states on Helium

Author

Dohrmann, F., Ahmidouch, A., Armstrong, C. S., Arrington, J., Asaturyan, R., Avery, S., Bailey, K., Baker, O. K., Bitao, H., Breuer, H., Brown, D. S., Carlini, R., Cha, J., Chant, N., Christy, E., Cochran, A., Cole, L., Crowder, J., Danagoulian, S., Elaasar, M., Ent, R., Fenker, H., Fujii, Y., Gan, L., Garrow, K., Geesaman, D. F., Gueye, P., Hafidi, K., Hinton, W., Juengst, H., Keppel, C., Liang, Y., Liu, J. H., Lung, A., Mack, D., Markowitz, P., Mitchell, J., Miyoshi, T., Mkrtchyan, H., Mtingwa, S. K., Mueller, B., Niculescu, G., Niculescu, I., Potterveld, D. H., Raue, B. A., Reimer, P. E., Reinhold, J., Roche, J., Sarsour, M., Sato, Y., Segel, R. E., Semenov, A. Y., Stepanyan, S., Tadevosian, V., Tajima, S., Tang, L., Uzzle, A., Wood, S., Yamaguchi, H., Yan, C., Yuan, L., Zeier, M., Zeidman, B., and Zihlmann, B.

Subjects
Electroproduction of Strangeness, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Hypernuclear Physics, Hyperons
Abstract

The A(e,e'K+)X reaction has been investigated at Jefferson Laboratory. Data were taken for Q2 approx 0.35\,\rm GeV2 at a beam energy of 3.245 GeV for 1H,3He and 4He targets. Evidence for Lambda-hypernuclear bound states is seen for 3,4He targets. This is the first time that the electroproduction of these hypernuclei has been observed.

Published
2005

25. Three trion breakup of 6Li + 3He at 132 MeV

Author

Karaoglan, E., Myersa, L. T., Lambert, J. M., Treado, P. A., Haftel, M. I., Slausa'c, I., Roos, P. G., Nadason, A., Carey, T. A., Chant, N. S., Ehlers, J., editor, Hepp, K., editor, Kippenhahn, R., editor, Weidenmüller, H. A., editor, Zittartz, J., editor, Beiglböck, W., editor, Zingl, H., editor, Haftel, M., editor, and Zankel, H., editor

Published
1978
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26. Electroproduction of Strangeness on 3,4He

Author

Dohrmann, F., Abbott, D., Ahmidouch, A., Ambrozewicz, P., Armstrong, C. S., Arrington, J., Asaturyan, R., Assamagan, K., Avery, S., Bailey, K., Baker, O. K., Beedoe, S., Bitao, H., Breuer, H., Brown, D. S., Carlini, R., Cha, J., Chant, N., Christy, E., Cochran, A., Cole, L., Collins, G., Cothran, C., Crowder, J., Cummings, W. J., Danagoulian, S., Duncan, F., Dunne, J., Dutta, D., Eden, T., Elaasar, M., Ent, R., Ewell, L., Fenker, H., Fortune, H. T., Fujii, Y., Gan, L., Gao, H., Garrow, K., Geesaman, D. F., Gueye, P., Gustafsson, K., Hafidi, K., Hansen, J. O., Hinton, W., Jackson, H. E., Juengst, H., Keppel, C., Klein, A., Koltenuk, D., Liang, Y., Liu, J. H., Lung, A., Mack, D., Madey, R., Markowitz, P., Martoff, C. J., Meekins, D., Mitchell, J., Miyoshi, T., Mkrtchyan, H., Mohring, R., Mtingwa, S. K., Mueller, B., O'Neill, T. J., Niculescu, G., Niculescu, I., Potterveld, D. H., Price, J. W., Raue, B. A., Reimer, P. E., Reinhold, J., Roche, J., Roos, P., Sarsour, M., Sato, Y., Savage, G., Sawafta, R., Segel, R. E., Semenov, A. Y., Stepanyan, S., Tadevosian, V., Tajima, S., Tang, L., Terburg, B., Uzzle, A., Wood, S., Yamaguchi, H., Yan-1, C., Yan-2, C., Yuan, L., Zeier, M., Zeidman, B., and Zihlmann, B.

Subjects
Electroproduction, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Strangeness, Hyperons, Hypernuclear boundstates
Abstract

The A(e,e'K+)X reaction has been investigated at Jefferson Laboratory. Data were taken for Q{2} approx 0.35 rm GeV2 at a beam energy of 3.245 rm GeV for 1H,3He and 4He targets. Missing mass spectra are fitted with Monte Carlo simulations taking into account the production of Lambda and Sigma0 hyperon production off the proton, and Sigma- off the neutron. Models for quasifree production are compared to the data, excess yields close to threshold are attributed to FSI. Evidence for Lambda-hypernuclear bound states is seen for 3,4He targets. This is the first time that the electroproduction of these hypernuclei has been observed.

Published
2003

27. Hyperon-Nucleon Bound States and Electroproduction of Strangeness on Light Nuclei

Author

Dohrmann, F., Abbott, D., Ahmidouch, A., Ambrozewicz, P., Armstrong, C. S., Arrington, J., Asaturyan, R., Assamagan, K., Avery, S., Bailey, K., Baker, O. K., Beedoe, S., Bitao, H., Breuer, H., Brown, D. S., Carlini, R., Cha, J., Chant, N., Christy, E., Cochran, A., Cole, L., Collins, G., Cothran, C., Crowder, J., Cummings, W. J., Danagoulian, S., Duncan, F., Dunne, J., Dutta, D., Eden, T., Elaasar, M., Ent, R., Ewell, L., Fenker, H., Fortune, H. T., Fujii, Y., Gan, L., Gao, H., Garrow, K., Geesaman, D. F., Gueye, P., Gustafsson, K., Hafidi, K., Hansen, J. O., Hinton, W., Jackson, H. E., Juengst, H., Keppel, C., Klein, A., Koltenuk, D., Liang, Y., Liu, J. H., Lung, A., Mack, D., Madey, R., Markowitz, P., Martoff, C. J., Meekins, D., Mitchell, J., Miyoshi, T., Mkrtchyan, H., Mohring, R., Mtingwa, S. K., Mueller, B., O'Neill, T. J., Niculescu, G., Niculescu, I., Potterveld, D. H., Price, J. W., Raue, B. A., Reimer, P. E., Reinhold, J., Roche, J., Roos, P., Sarsour, M., Sato, Y., Savage, G., Sawafta, R., Segel, R. E., Semenov, A. Y., Stepanyan, S., Tadevosian, V., Tajima, S., Tang, L., Terburg, B., Uzzle, A., Wood, S., Yamaguchi, H., Yan-1, C., Yan-2, C., Yuan, L., Zeier, M., Zeidman, B., and Zihlmann, B.

Subjects
TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Electroproduction of strangeness, Nuclear targets, Spectral function
Abstract

The A(e,e'K+)YX reaction has been investigated in Hall C at Jefferson Laboratory for 6 different targets. Data were taken for Q2ࣈ 0.35 and 0.5 GeV2 at a beam energy of 3.245 GeV for 3H, 2H, 2He, C and Al targets. The missing mass spectra are fitted with Monte Carlo simulations taking into account the production of Lambda and Sigma0 hyperon production off the proton, and Sigma- off the neutron. Models for quasifree production are compared to the data, excess yields close to threshold are attributed to FSI. Evidence for Lambda-hypernuclear bound states is seen for 3,4He targets.

Published
2003

28. Hyperon--Nucleon Bound States and Electroproduction of Strangeness on 3,4He

Author

Dohrmann, F., Abbott, D., Ahmidouch, A., Ambrozewicz, P., Armstrong, C. S., Arrington, J., Asaturyan, R., Assamagan, K., Avery, S., Bailey, K., Baker, O. K., Beedoe, S., Bitao, H., Breuer, H., Brown, D. S., Carlini, R., Cha, J., Chant, N., Christy, E., Cochran, A., Cole, L., Collins, G., Cothran, C., Crowder, J., Cummings, W. J., Danagoulian, S., Duncan, F., Dunne, J., Dutta, D., Eden, T., Elaasar, M., Ent, R., Ewell, L., Fenker, H., Fortune, H. T., Fujii, Y., Gan, L., Gao, H., Garrow, K., Geesaman, D. F., Gueye, P., Gustafsson, K., Hafidi, K., Hansen, J. O., Hinton, W., Jackson, H. E., Juengst, H., Keppel, C., Klein, A., Koltenuk, D., Liang, Y., Liu, J. H., Lung, A., Mack, D., Madey, R., Markowitz, P., Martoff, C. J., Meekins, D., Mitchell, J., Miyoshi, T., Mkrtchyan, H., Mohring, R., Mtingwa, S. K., Mueller, B., O'Neill, T. J., Niculescu, G., Niculescu, I., Potterveld, D. H., Price, J. W., Raue, B. A., Reimer, P. E., Reinhold, J., Roche, J., Roos, P., Sarsour, M., Sato, Y., Savage, G., Sawafta, R., Segel, R. E., Semenov, A. Y., Stepanyan, S., Tadevosian, V., Tajima, S., Tang, L., Terburg, B., Uzzle, A., Wood, S., Yamaguchi, H., Yan-1, C., Yan-2, C., Yuan, L., Zeier, M., Zeidman, B., and Zihlmann, B.

Subjects
TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY
Abstract

The A(e,e'K+)YX reaction has been investigated in Hall C at Jefferson Lab. Data were taken for Q2 approx 0.35 and 0.5 GeV2 at a beam energy of 3.245 GeV for 3He,4He. The missing mass spectra are fitted with Monte Carlo simulations including Lambda, Sigma0, Sigma- hyperon production. Models for quasifree production are compared to the data, excess yields close to threshold are attributed to FSI. Evidence for Lambda-hypernuclear bound states is seen for 3,4He targets.

Published
2003

29. Separation of the longitudinal and transverse cross sections in the $^{1}H(e,e'K^{+})\Lambda$ and $^{1}H(e,e'K^{+})\Sigma^{0}$ reactions

Author

Mohring, R.M., Abbott, D., Ahmidouch, A., Amatuni, T.A., Ambrozewicz, P., Angelescu, T., Armstrong, C.S., Arrington, J., Assamagan, K., Avery, S., Bailey, K., Beard, K., Beedoe, S., Beise, E.J., Breuer, H., Carlini, R., Cha, J., Chang, C.C., Chant, N., Cisbani, E., Collins, G., Cummings, W., Danagoulian, S., De Leo, R., Duncan, F., Dunne, J., Dutta, D., Eden, T., Ent, R., Eraud, L., Ewell, L., Finn, M., Fortune, T., Frolov, V., Frullani, S., Furget, C., Garibaldi, F., Gaskell, D., Geesaman, D.F., Gueye, P., Gustafsson, K.K., Hansen, J.O., Harvey, M., Hinton, W., Hungerford, E., Iodice, M., Jackson, C., Keppel, C., Kim, W., Kino, K., Koltenuk, D., Kox, S., Kramer, L., Leone, T., Lung, A., Mack, D., Madey, R., Maeda, M., Majewski, S., Markowitz, P., Mart, T., Martoff, C.J., Meekins, D., Mihul, A., Mitchell, J., Mkrtchyan, H., Mtingwa, S., Niculescu, I., Perrino, R., Potterveld, D., Price, J.W., Raue, B.A., Real, J.S., Reinhold, J., Roos, P., Saito, T., Savage, G., Sawafta, R., Segel, R., Stepanyan, S., Stoler, P., Tadevosian, V., Tang, L., Teodorescu, L., Terasawa, T., Tsubota, H., Urciuoli, G.M., Volmer, J., Vulcan, W., Welch, T.P., Williams, R., Wood, S., Yan, C., Zeidman, B., Laboratoire de Physique Subatomique et de Cosmologie (LPSC), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment
Abstract

We report measurements of cross sections for the reaction p(e,e'K)Y, for both the Lambda and Sigma_0 hyperon states, at an invariant mass of W=1.84 GeV and four-momentum transfers 0.5

Published
2003

30. Longitudinal electroproduction of charged pions from (1)H, (2)H, and (3)He

Author

Ahmidouch, A., Ambrozewicz, P., Anklin, H., John Arrington, Assamagan, K., Avery, S., Bailey, K., Baker, O. K., Beedoe, S., Beise, B., Breuer, H., Brown, D. S., Carlini, R., Cha, J., Chant, N., Cowley, A., Danagoulian, S., Schepper, D., Dunne, J., Dutta, D., Ent, R., Gan, L., Gaskell, D., Gasparian, A., Geesaman, D. F., Gilman, R., Glashausser, C., Gueye, P., Harvey, M., Hashimoto, O., Hinton, W., Hofman, G., Jackson, C., Jackson, H. E., Keppel, C., Kinney, E., Koltenuk, D., Kyle, G., Lung, A., Mack, D., Mckee, D., Mitchell, J., Mkrtchyan, H., Mueller, B., Niculescu, G., Niculescu, I., O Neill, T. G., Papavassiliou, V., Potterveld, D., Reinhold, J., Roos, P., Sawafta, R., Segel, R., Stepanyan, S., Tadevosyan, V., Takahashi, T., Tang, L., Terburg, B., Westrum, D., Volmer, J., Welch, T. P., Wood, S., Yuan, L., Zeidman, B., and Zihlmann, B.

Abstract

Separated longitudinal and transverse cross sections for charged pion electroproduction from (1)H, (2)H, and (3)He were measured at Q(2) = 0.4 (GeV/c)(2) for two values of the invariant mass, W = 1.15 GeV and W = 1.60 GeV, in a search for a mass dependence which would signal the effect of nuclear pions. This is the first such study that includes recoil momenta significantly above the Fermi surface. The longitudinal cross section, if dominated by the pion-pole process, should be sensitive to nuclear pion currents. Comparisons of the longitudinal cross section target ratios to a quasifree calculation reveal a significant suppression in (3)He at W = 1.60 GeV. The W = 1.15 GeV results are consistent with simple estimates of the effect of nuclear pion currents, but are also consistent with pure quasifree production.

Published
2001

33. Electroproduction of Kaons and Light Nuclei

Author

Zeidman, B., Abbott, D., Ahmidouch, A., Ambrozewicz, P., Armstrong, C. S., Arrington, J., Asaturyan, R., Assamagan, K., Avery, S., Bailey, K., Baker, O. K., Beedoe, S., Bitao, H., Breuer, H., Brown, D. S., Carlini, R., Cha, J., Chant, N., Christy, E., Cochran, A., Cole, L., Collins, G., Cothran, C., Crowder, J., Cummings, W. J., Danagoulian, S., Dohrmann, F., Duncan, F., Dunne, J., Dutta, D., Eden, T., Elaasar, M., Ent, R., Ewell, L., Fenker, H., Fortune, H. T., Fujii, Y., Gan, L., Gao, H., Garrow, K., Geesaman, D., Gueye, P., Gustafsson, K., Hafidi, K., Hansen, J. O., Hinton, W., Jackson, H. E., Juengst, H., Keppel, C., Klein, A., Koltenuk, D., Liang, Y., Liu, J. H., Lung, A., Mack, D., Madey, R., Markowitz, P., Martoff, C. J., Meekins, D., Mitchell, J., Miyoshi, T., Mkrtchyan, H., Mohring, R., Mtingwa, S. K., Mueller, B., O'Neill, T. G., Niculescu, G., Niculescu, I., Potterveld, D., Price, J. W., Raue, B. A., Reimer, P. E., Reinhold, J., Roche, J., Roos, P., Sarsour, M., Sato, Y., Savage, G., Sawafta, R., Schiffer, J. P., Segel, R. E., Semenov, A., Stepanyan, S., Tadevosian, V., Tajima, S., Tang, L., Terburg, B., Uzzle, A., Wood, S., Yamaguchi, H., Yan (Jlab), C., Yan (Kent), C., Yuan, L., Zeier, M., and Zihlmann, B.

Subjects
TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY
Abstract

The A(e,e,K+YX reaction on H, D, 3He, and 4He was investigated in Hall C at CEBAF. Data were obtained for Q2≈0.35 and 0.5 GeV2 at 3.245 GeV. The missing mass spectra for both H and D are fitted with Monte-Carlo simulations incorporating peaks corresponding to Λ production on the proton and Σ production on both the proton and neutron. For D, the cross section ratio Σ0/Σ-≈2, and excess yield close to the thresholds for Λ and Σ production can be attributed to final-state interactions; models are compared to the data. The analysis of the data for the He targets is in a more preliminary state with broader quasi-free peaks resulting from the higher Fermi momenta. Evidence for bound Λ-hypernuclear states is seen and other structure may be present.

Published
2001

34. Dynamical relativistic effects in quasielastic 1p-shell proton knockout from $^{16}$O

Author

Gao, J., Anderson, B. D., Aniol, K. A., Auerbach, L., Baker, F. T., Beise, E. J., Berthot, J., Bertin, P. Y., Bertozzi, W., Bimbot, L., Boeglin, W. U., Brash, E. J., Vincent Breton, Breuer, H., Burtin, E., Calarco, J. R., Cardman, L. S., Cates, G. D., Cavata, C., Chang, C. C., Chant, N. S., Chen, J. P., Cisbani, E., Dale, D. S., Deur, A., Diederich, B., Djawotho, P., Doyle, B., Ducret, J. E., Epstein, M. B., Ewell, L. A., Finn, J. M., Fissum, K. G., Fonvieille, H., Frois, B., Frullani, S., Garibaldi, F., Gasparian, A., Gilad, S., Gilman, R., Glamazdin, A., Glashausser, C., Gomez, J., Gorbenko, V., Gorringe, T., Griffieon, K., Hersman, F. W., Holmes, R., Holtrop, M., Hose, N. D., Howell, C., Huber, G. M., Hyde-Wright, C., Iodice, M., Jager, C. W., Jaminion, S., Jones, M. K., Joo, K., Jutier, C., Kahl, W., Kato, S., Kelly, J. J., Kerhoas, S., Khandaker, M., Khayat, M., Kino, K., Korsch, W., Kramer, L. H., Kumar, K. S., Kumbartzki, G., Laveissiere, G., Leo, R., Leone, A., Le Rose, J. J., Levchuk, L., Liang, M., Lindgren, R. A., Liyanage, N., Lolos, G. J., Lourie, R. W., Madey, R., Maeda, K., Malov, S., Manley, D. M., Margaziotis, D. J., Markowitz, P., Marroncle, J., Martino, J., Mccarty, J. S., Mccormick, K., Mcintyre, J., Meer, R. L. J., Meziani, Z. E., Michaels, R., Mougey, J. Y., Nanda, S. K., Neyret, D., Offermann, E. A. J. M., Papandreou, Z., Perdrisat, C. F., Perrino, R., Petratos, G. G., Platchkov, S., Pomatsalyuk, R., Prout, D. L., Punjabi, V. A., Pussieux, T., Quéméner, G., Ransome, R. D., Ravel, O., Roblin, Y., Roche, R., Rondon-Aramayo, O. A., Roos, P. G., Rowntree, D., Rutledge, G., Rutt, P. M., Saha, A., Saito, T., Sarty, A. J., Serdarevic-Offermann, A., Smith, T., Soldi, K., Sorokin, P., Souder, P. A., Suleiman, R., Templon, J. A., Terasawa, T., Todor, L., Tsubota, H., Ueno, H., Ulmer, P. E., Urciuoli, G. M., Vernin, P., Verst, S., Vlahovic, B., Voskanyan, H., Watson, J. W., Weinstein, L. B., Wijesooriya, K., Wilson, R., Wojtsekhowski, B. B., Zainea, D. G., Zeps, V., Zhao, J., Zhou, Z. L., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), HALL A, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and 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)

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Abstract

We have measured the cross section for quasielastic 1p-shell proton knockout in the 16O(e,e′p) reaction at ω=0.439GeV and Q2=0.8(GeV/c)2 for missing momentum Pmiss≤355MeV/c. We have extracted the response functions RL+TT, RT, RLT, and the left-right asymmetry, ALT, for the 1p1/2 and the 1p3/2 states. The data are well described by relativistic distorted wave impulse approximation calculations. At large Pmiss, the structure observed in ALT indicates the existence of dynamical relativistic effects. (APS)

Published
2000

35. Quasielastic 1p-shell proton knockout from $^{16}O$ at $Q^{2} = 0.8 (GeV/c)^{2}$

Author

Gao, J, Anderson, B D, Aniol, K A, Auerbach, L B, Baker, F T, Beise, E J, Berthot, J, Bertin, P Y, Bertozzi, W, Bimbot, L, Brash, E J, Breton, V, Breuer, H, Burtin, E, Böglin, W, Calarco, J R, Cardman, L S, Cates, G D, Cavata, C, Chang, C C, Chant, N S, Chen, J P, Cisbani, E, D'Hose, N, Dale, D S, De Jager, C W, De Leo, R, Deur, A, Diederich, B, Djawotho, P, Doyle, B, Ducret, J E, Epstein, M B, Ewell, L A, Finn, J M, Fissum, K G, Fonvieille, H, Frois, Bernard, Frullani, S, Garibaldi, F, Gasparian, A, Gilad, S, Gilman, R, Glamazdin, A V, Glashausser, C, Gorbenko, V G, Gorringe, T P, Griffieon, K, Gómez, J, Hersman, F W, Holmes, R, Holtrop, M, Howell, C, Huber, G M, Hyde-Wright, C E, Iodice, M, Jaminion, S, Jones, M K, Joo, K K, Jutier, C, Kahl, W E, Kato, S, Kelly, J J, Kerhoas, S, Khandaker, M, Khayat, M, Kino, K, Korsch, W, Kramer, L, Kumar, K S, Kumbartzki, G J, Laveissière, G, Le Rose, J J, Leone, A, Levchuk, L G, Liang, M, Lindgren, R A, Liyanage, N K, Lolos, G J, Lourie, R W, Madey, R, Maeda, K I, Malov, S Y, Manley, D M, Margaziotis, D J, Markowitz, P, Martino, J, McCarthy, J S, McCormick, K, McIntyre, J, Meziani, Z E, Michaels, R, Mougey, J, Nanda, S, Neyret, D, Offermann, E, Papandreou, Z, Perdrisat, C F, Perrino, R, Petratos, G G, Platchkov, S K, Pomatsalyuk, R I, Prout, D L, Punjabi, V A, Pussieux, T, Quéméner, G, Ransome, R D, Ravel, O, Roblin, Y, Roché, R, Rondon-Aramayo, O A, Roos, P G, Rowntree, D, Rutledge, G A, Rutt, P M, Saha, A, Saitô, T, Sarty, A J, Serdarevic-Offermann, A, Smith, T P, Soldi, A, Sorokin, P, Souder, P A, Suleiman, R, Templon, J A, Terasawa, T, Todor, L, Tsubota, H, Ueno, H, Ulmer, P E, Urciuoli, G M, Van Verst, S P, Van der Meer, R L J, Vernin, P, Vlahovic, B, Voskanyan, H, Watson, J W, Weinstein, L B, Wijesooriya, K, Wilson, R, Wojtsekhowski, B B, Zainea, D G, Zeps, V, Zhao, J, and Zhou, Z L

Subjects
Nuclear Physics
Published
1999

36. Precise measurement of the deuteron elastic structure function A(Q$^{2}$)

Author

Abbott, D., Ahmidouch, A., Anklin, H., Arvieux, J., Ball, J., Beedoe, S., Beise, E. J., Bimbot, L., Boeglin, W., Breuer, H., Carlini, R., Chant, N. S., Danagoulian, S., Dow, K., E Ducret, J., Dunne, J., Ent, R., Ewell, L., Eyraud, L., Furget, C., Garcon, M., Gilman, R., Glashausser, C., Gueye, P., Gustafsson, K., Hafidi, K., Honegger, A., Jourdan, J., Kox, S., Kumbartzki, G., Lu, L., Lung, A., Mack, D., Markowitz, P., Mcintyre, J., Meekins, D., Merchez, F., Mitchell, J., Mohring, R., Mtingwa, S., Mrktchyan, H., Pitz, D., Qin, L., Ransome, R., Real, J. S., Roos, P. G., Rutt, P., Sawafta, R., Stepanyan, S., Tieulent, R., Tomasi-Gustafsson, E., Turchinetz, W., Vansyoc, K., Volmer, J., Eric Voutier, Vulcan, W., Williamson, C., Wood, S. A., Yan, C., Zhao, J., Zhao, W., 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), and JLAB t20

Subjects
Nuclear Theory, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

The A(Q^2) structure function in elastic electron-deuteron scattering was measured at six momentum transfers Q^2 between 0.66 and 1.80 (GeV/c)^2 in Hall C at Jefferson Laboratory. The scattered electrons and recoil deuterons were detected in coincidence, at a fixed deuteron angle of 60.5 degrees. These new precise measurements resolve discrepancies between older sets of data. They put significant constraints on existing models of the deuteron electromagnetic structure, and on the strength of isoscalar meson exchange currents., Comment: 3 LaTeX pages plus 2 PS figures

Published
1999

37. Deuteron electromagnetic form factors

Author

Beise, E. J., Abbott, D., Ahmidouch, A., Anklin, H., Arvieux, J., Ball, J., Beedoe, S., Bimbot, L., Boeglin, W., Breuer, H., Carlini, R., Chant, N. S., Danagulian, S., Dow, K., Ducret, J. E., Dunne, J., Ewell, L., Eyraud, L., Furget, C., Garcon, M., Gilman, R., Glashausser, C., Gueye, P., Gustafsson, K., Hafidi, K., Honegger, A., Jourdan, J., Kox, S., Kumbartzki, G., Lu, L., Lung, A., Mack, D., Markowitz, P., Mcintyre, J., Meekins, D., Merchez, F., Mitchell, J., Mtingwa, S., Mkrtchian, H., Pitz, D., Qin, L., Ransome, R., Real, J. S., Roos, P. G., Rutt, P., Schmidt, W., Sawafta, R., Stepanian, S., Stephenson, E. J., Tieulent, R., Tomasi-Gustafsson, E., Turchinetz, W., Vansyoc, K., Volmer, J., Eric Voutier, Vulcan, W., Williamson, C., Wood, S. A., Yan, C., Zhao, J., Zhao, W., bibliotheque, LPSC, 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), and JLAB t20

Subjects
[PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Published
1999

38. Strange Quark Contributions to Parity-Violating Asymmetries in the Forward G0 Electron-Proton Scattering Experiment

Author

Armstrong, D.S., Armstrong, D.S., Arvieux, J., Asaturyan, R., Averett, T., Bailey, S.L., Batigne, G., Beck, D.H., Beise, E.J., Benesch, J., Bimbot, L., Birchall, J., Hannelius, L., Hasty, R., Hawthorne-Allen, A., Horn, T., Johnston, K., Jones, M., Kammel, P., Kazimi, R., King, P.M., Kolarkar, A., Korkmaz, E., Korsch, W., Kox, S., Kuhn, J., Lachniet, J., Lee, L., Lenoble, J., Liatard, E., Liu, J., Loupias, B., Lung, A., MacLachlan, G.A., Marchand, D., Martin, J.W., McFarlane, K.W., McKee, D.W., McKeown, R.D., Merchez, F., Mkrtchyan, H., Moffit, B., Morlet, M., Nakagawa, I., Nakahara, K., Nakos, M., Neveling, R., Niccolai, S., Ong, S., Page, S., Papavassiliou, V., Pate, S.F., Phillips, S.K., Pitt, M.L., Poelker, M., Porcelli, T.A., Quemener, G., Quinn, B., Ramsay, W.D., Rauf, A.W., Real, J.S., Roche, J., Roos, P., Rutledge, G.A., Secrest, J., Simicevic, N., Smith, G.R., Spayde, D.T., Stepanyan, S., Stutzman, M., Sulkosky, V., Tadevosyan, V., Tieulent, R., van de Wiele, J., van Oers, W., Voutier, E., Vulcan, W., Warren, G., Wells, S.P., Williamson, S.E., Wood, S.A., Yan, C., Yun, J., Zeps, V., Biselli, A., Bosted, P., Boukobza, E., Breuer, H., Carlini, R., Carr, R., Chant, N., Chao, Y.C., Chattopadhyay, S., Clark, R., Covrig, S., Cowley, A., Dale, D., Davis, C., Falk, W., Finn, J.M., Forest, T., Franklin, G., Furget, C., Gaskell, D., Grames, J., Griffioen, K.A., Grimm, K., Guillon, B., Guler, H., Armstrong, D.S., Armstrong, D.S., Arvieux, J., Asaturyan, R., Averett, T., Bailey, S.L., Batigne, G., Beck, D.H., Beise, E.J., Benesch, J., Bimbot, L., Birchall, J., Hannelius, L., Hasty, R., Hawthorne-Allen, A., Horn, T., Johnston, K., Jones, M., Kammel, P., Kazimi, R., King, P.M., Kolarkar, A., Korkmaz, E., Korsch, W., Kox, S., Kuhn, J., Lachniet, J., Lee, L., Lenoble, J., Liatard, E., Liu, J., Loupias, B., Lung, A., MacLachlan, G.A., Marchand, D., Martin, J.W., McFarlane, K.W., McKee, D.W., McKeown, R.D., Merchez, F., Mkrtchyan, H., Moffit, B., Morlet, M., Nakagawa, I., Nakahara, K., Nakos, M., Neveling, R., Niccolai, S., Ong, S., Page, S., Papavassiliou, V., Pate, S.F., Phillips, S.K., Pitt, M.L., Poelker, M., Porcelli, T.A., Quemener, G., Quinn, B., Ramsay, W.D., Rauf, A.W., Real, J.S., Roche, J., Roos, P., Rutledge, G.A., Secrest, J., Simicevic, N., Smith, G.R., Spayde, D.T., Stepanyan, S., Stutzman, M., Sulkosky, V., Tadevosyan, V., Tieulent, R., van de Wiele, J., van Oers, W., Voutier, E., Vulcan, W., Warren, G., Wells, S.P., Williamson, S.E., Wood, S.A., Yan, C., Yun, J., Zeps, V., Biselli, A., Bosted, P., Boukobza, E., Breuer, H., Carlini, R., Carr, R., Chant, N., Chao, Y.C., Chattopadhyay, S., Clark, R., Covrig, S., Cowley, A., Dale, D., Davis, C., Falk, W., Finn, J.M., Forest, T., Franklin, G., Furget, C., Gaskell, D., Grames, J., Griffioen, K.A., Grimm, K., Guillon, B., and Guler, H.

Abstract

We have measured parity-violating asymmetries in elastic electron-proton scattering over the range of momentum transfers 0.12 ≤ Q2 ≤ 1.0 GeV2. These asymmetries, arising from interference of the electromagnetic and neutral weak interactions, are sensitive to strange quark contributions to the currents of the proton. The measurements were made at JLab using a toroidal spectrom- eter to detect the recoiling protons from a liquid hydrogen target. The results indicate non-zero, Q2 dependent, strange quark contributions and provide new information beyond that obtained in previous experiments.

Published
2010

39. Charged pion form factor between Q2=0.60 and 2.45 GeV2. II. Determination of, and results for, the pion form factor

Author

Huber, G.M., Huber, G.M., Blok, H.P., Horn, T., Beise, E.J., Gaskell, D., Mack, D.J., Tadevosyan, V., Volmer, J., Abbott, D., Aniol, K., Anklin, H., Armstrong, C., Arrington, J., Assamagan, K., Avery, S., Baker, O.K., Barrett, B., Bochna, C., Boeglin, W., Brash, E.J., Breuer, H., Chang, C.C., Chant, N., Christy, M.E., Dunne, J., Eden, T., Ent, R., Fenker, H., Gibson, E.F., Gilman, R., Gustafsson, K., Hinton, W., Holt, J., Jackson, H., Jin, S., Jones, M.K., Keppel, C.E., Kim, P.H., Kim, W., King, P.M., Klein, A., Koltenuk, D., Kovaltchouk, V., Liang, M., Liu, J., Lolos, G.J., Lung, A., Margaziotis, D.J., Markowitz, P., Matsumura, A., McKee, D., Meekins, D., Mitchell, J., Miyoshi, T., Mkrtchyan, H., Mueller, B., Niculescu, G., Niculescu, I., Okayasu, Y., Pentchev, L., Perdrisat, C., Pitz, D., Potterveld, D., Punjabi, V., Qin, L.M., Reimer, P.E., Reinhold, J., Roche, J., Roos, P.G., Sarty, A., Shin, I.K., Smith, G.R., Stepanyan, S., Tang, L.G., Tvaskis, V., van der Meer, R.L.J., Vansyoc, K., VanWestrum, D., Vidakovic, S., Vulcan, W., Warren, G., Wood, S.A., Xu, C., Yan, C., Zhao, W.-X., Zheng, X., Zihlmann, B., The Jefferson Lab Fπ Collaboration, Huber, G.M., Huber, G.M., Blok, H.P., Horn, T., Beise, E.J., Gaskell, D., Mack, D.J., Tadevosyan, V., Volmer, J., Abbott, D., Aniol, K., Anklin, H., Armstrong, C., Arrington, J., Assamagan, K., Avery, S., Baker, O.K., Barrett, B., Bochna, C., Boeglin, W., Brash, E.J., Breuer, H., Chang, C.C., Chant, N., Christy, M.E., Dunne, J., Eden, T., Ent, R., Fenker, H., Gibson, E.F., Gilman, R., Gustafsson, K., Hinton, W., Holt, J., Jackson, H., Jin, S., Jones, M.K., Keppel, C.E., Kim, P.H., Kim, W., King, P.M., Klein, A., Koltenuk, D., Kovaltchouk, V., Liang, M., Liu, J., Lolos, G.J., Lung, A., Margaziotis, D.J., Markowitz, P., Matsumura, A., McKee, D., Meekins, D., Mitchell, J., Miyoshi, T., Mkrtchyan, H., Mueller, B., Niculescu, G., Niculescu, I., Okayasu, Y., Pentchev, L., Perdrisat, C., Pitz, D., Potterveld, D., Punjabi, V., Qin, L.M., Reimer, P.E., Reinhold, J., Roche, J., Roos, P.G., Sarty, A., Shin, I.K., Smith, G.R., Stepanyan, S., Tang, L.G., Tvaskis, V., van der Meer, R.L.J., Vansyoc, K., VanWestrum, D., Vidakovic, S., Vulcan, W., Warren, G., Wood, S.A., Xu, C., Yan, C., Zhao, W.-X., Zheng, X., Zihlmann, B., and The Jefferson Lab Fπ Collaboration

Abstract

The charged pion form factor, Fπ(Q2), is an important quantity that can be used to advance our knowledge of hadronic structure. However, the extraction of Fπ from data requires a model of the 1H(e,e'π+)n reaction and thus is inherently model dependent. Therefore, a detailed description of the extraction of the charged pion form factor from electroproduction data obtained recently at Jefferson Lab is presented, with particular focus given to the dominant uncertainties in this procedure. Results for Fπ are presented for Q2=0.60-2.45 GeV2. Above Q2=1.5 GeV2, the Fπ values are systematically below the monopole parametrization that describes the low Q2 data used to determine the pion charge radius. The pion form factor can be calculated in a wide variety of theoretical approaches, and the experimental results are compared to a number of calculations. This comparison is helpful in understanding the role of soft versus hard contributions to hadronic structure in the intermediate Q2 regime.

Published
2008

40. The A(Q$^2$) deuteron structure function from the Jefferson Lab t$_20$ experiment

Author

Pitz, D., Abbott, D., Ahmidouch, A., Anklin, H., Arvieux, J., Ball, J., Beedoe, S., Beise, E. J., Bimbot, L., Boeglin, W., Breuer, H., Carlini, R., Chant, N. S., Danagoulian, S., Dow, K., Ducret, J. E., Dunne, J., Ewell, L., Eyraud, L., Furget, C., Garcon, M., Gilman, R., Glashausser, C., Gueye, P., Gustafsson, K., Hafidi, K., Honegger, A., Jourdan, J., Kox, S., Kumbartzki, G., Lu, L., Lung, A., Mack, D., Markowitz, P., Mcintyre, J., Meekins, D., Merchez, F., Mitchell, J., Mtingwa, S., Mrktchyan, H., Qin, L., Ransome, R., Real, J. S., Roos, P. G., Rutt, P., Schmidt, W., Sawafta, R., Stepanyan, S., Stephenson, E. J., Tieulent, R., Tomasi-Gustafsson, E., Turchinetz, W., Vansyoc, K., Volmer, J., Eric Voutier, Vulcan, W., Williamson, C., Wood, S. A., Yan, C., Zhao, J., Zhao, W., 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Menze D.W., JLAB t20, and bibliotheque, LPSC

Subjects
[PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Published
1998

41. Tensor polarization and cross-section measurement in elastic electron-deuteron scattering between 4.1 and 6.8 fm$^{-1}$ of momentum transfer

Author

Ducret, J. E., Abbott, D., Ahmidouch, A., Anklin, H., Arvieux, J., Ball, J., Beedoe, S., Beise, E. J., Bimbot, L., Boeglin, W., Breuer, H., Carlini, R., Chant, N. S., Danagoulian, S., Dow, K., Dunne, J., Ewell, L., Eyraud, L., Furget, C., Garcon, M., Gilman, R., Glashausser, C., Gueye, P., Gustafsson, K., Hafidi, K., Honegger, A., Jourdan, J., Kox, S., Kumbartzki, G., Lu, L., Lung, A., Mack, D., Markowitz, P., Mcintyre, J., Meekins, D., Merchez, F., Mitchell, J., Mtingwa, S., Mrktchyan, H., Pitz, D., Qin, L., Ransome, R., Real, J. S., Roos, P. G., Rutt, P., Schmidt, W., Sawafta, R., Stepanyan, S., Stephenson, E. J., Tieulent, R., Tomasi-Gustafsson, E., Turchinetz, W., Vansyoc, K., Volmer, J., Eric Voutier, Vulcan, W., Williamson, C., Wood, S. A., Yan, C., Zhao, J., Zhao, W., 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Adam J., and JLAB t20

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Published
1998

42. Deuteron elastic form factors : opportunity for Blast ?

Author

Turchinetz, W., Ahmidouch, A., Dow, K., Williamson, C., Zhao, W., Eyraud, L., Furget, C., Kox, S., Lu, L., Merchez, F., Real, J. S., Tieulent, R., Eric Voutier, Ball, J., Ducret, J. E., Garcon, M., Hafidi, K., Pitz, D., Beise, E. J., Breuer, H., Chant, N. S., Ewell, L., Gustafsson, K., Lung, A., Mohring, R., Roos, P. G., Abbott, D., Carlini, R., Dunne, J., Gueye, P., Mack, D., Meekins, D., Mitchell, J., Qin, L., Vansyoc, K., Volmer, J., Vulcan, W., Wood, S. A., Yan, C., Gilman, R., Glashausser, C., Kumbartzki, G., Mcintyre, J., Ransome, R., Rutt, P., Honneger, A., Jourdan, J., Zhao, J., Arvieux, J., Tomasi-Gustafsson, E., Beedoe, S., Danagoulian, S., Mtingwa, S., Sawafta, R., Anklin, H., Boeglin, W., Markowitz, P., Bimbot, L., Mrktchyan, H., Stepanyan, S., Schmidt, W., Stephenson, E. J., Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), 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), Alarcon R., and JLAB t20

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Published
1998

43. Transverse Beam Spin Asymmetries in Forward-Angle Elastic Electron-Proton Scattering

Author

Armstrong, D.S., Armstrong, D.S., Arvieux, J., Asaturyan, R., Averett, T., Bailey, S.L., Batigne, G., Beck, D.H., Beise, E.J., Benesch, J., Bimbot, L., Birchall, J., Roche, J., Roos, P., Rutledge, G.A., Secrest, J., Simicevic, N., Smith, G.R., Spayde, D.T., Stepanyan, S., Stutzman, M., Sulkosky, V., Tadevosyan, V., Tieulent, R., Van de Wiele, J., van Oers, W.T.H., Voutier, E., Vulcan, W., Warren, G., Wells, S.P., Williamson, S.E., Wood, S.A., Yan, C., Yun, J., Zeps, V., G0 Collaboration, Biselli, A., Bosted, P., Boukobza, E., Breuer, H., Carlini, R., Carr, R., Chant, N., Chao, Y.-C., Chattopadhyay, S., Clark, R., Covrig, S., Cowley, A., Dale, D., Davis, C., Falk, W., Finn, J.M., Forest, T., Franklin, G., Furget, C., Gaskell, D., Grames, J., Griffioen, K.A., Grimm, K., Guillon, B., Guler, H., Hannelius, L., Hasty, R., Hawthorne Allen, A., Horn, T., Johnston, K., Jones, M., Kammel, P., Kazimi, R., King, P.M., Kolarkar, A., Korkmaz, E., Korsch, W., Kox, S., Kuhn, J., Lachniet, J., Lee, L., Lenoble, J., Liatard, E., Liu, J., Loupias, B., Lung, A., Marchand, D., Martin, J.W., McFarlane, K.W., McKee, D.W., McKeown, R.D., Merchez, F., Mkrtchyan, H., Moffit, B., Morlet, M., Nakagawa, I., Nakahara, K., Neveling, R., Ong, S., Page, S., Papavassiliou, V., Pate, S.F., Phillips, S.K., Pitt, M.L., Poelker, M., Porcelli, T.A., Quéméner, G., Quinn, B., Ramsay, W.D., Rauf, A.W., Real, J.-S., Armstrong, D.S., Armstrong, D.S., Arvieux, J., Asaturyan, R., Averett, T., Bailey, S.L., Batigne, G., Beck, D.H., Beise, E.J., Benesch, J., Bimbot, L., Birchall, J., Roche, J., Roos, P., Rutledge, G.A., Secrest, J., Simicevic, N., Smith, G.R., Spayde, D.T., Stepanyan, S., Stutzman, M., Sulkosky, V., Tadevosyan, V., Tieulent, R., Van de Wiele, J., van Oers, W.T.H., Voutier, E., Vulcan, W., Warren, G., Wells, S.P., Williamson, S.E., Wood, S.A., Yan, C., Yun, J., Zeps, V., G0 Collaboration, Biselli, A., Bosted, P., Boukobza, E., Breuer, H., Carlini, R., Carr, R., Chant, N., Chao, Y.-C., Chattopadhyay, S., Clark, R., Covrig, S., Cowley, A., Dale, D., Davis, C., Falk, W., Finn, J.M., Forest, T., Franklin, G., Furget, C., Gaskell, D., Grames, J., Griffioen, K.A., Grimm, K., Guillon, B., Guler, H., Hannelius, L., Hasty, R., Hawthorne Allen, A., Horn, T., Johnston, K., Jones, M., Kammel, P., Kazimi, R., King, P.M., Kolarkar, A., Korkmaz, E., Korsch, W., Kox, S., Kuhn, J., Lachniet, J., Lee, L., Lenoble, J., Liatard, E., Liu, J., Loupias, B., Lung, A., Marchand, D., Martin, J.W., McFarlane, K.W., McKee, D.W., McKeown, R.D., Merchez, F., Mkrtchyan, H., Moffit, B., Morlet, M., Nakagawa, I., Nakahara, K., Neveling, R., Ong, S., Page, S., Papavassiliou, V., Pate, S.F., Phillips, S.K., Pitt, M.L., Poelker, M., Porcelli, T.A., Quéméner, G., Quinn, B., Ramsay, W.D., Rauf, A.W., and Real, J.-S.

Abstract

We have measured the beam-normal single-spin asymmetry in elastic scattering of transversely polarized 3 GeV electrons from unpolarized protons at Q2=0.15, 0.25 (GeV/c)2. The results are inconsistent with calculations solely using the elastic nucleon intermediate state and generally agree with calculations with significant inelastic hadronic intermediate state contributions. An provides a direct probe of the imaginary component of the 2γ exchange amplitude, the complete description of which is important in the interpretation of data from precision electron-scattering experiments.

Published
2007

44. Transverse beam spin asymmetries in forward-angle elastic electron-proton scattering

Author

Physics, Armstrong, D. S., Arvieux, J., Asaturyan, R., Averett, T., Bailey, S. L., Batigne, G., Beck, D. H., Beise, E. J., Benesch, J., Bimbot, L., Birchall, J., Biselli, A., Bosted, P., Boukobza, E., Breuer, H., Carlini, R., Carr, Rachel E., Chant, N., Chao, Y. C., Chattopadhyay, S., Clark, R., Covrig, S., Cowley, A., Dale, D., Davis, C., Falk, W., Finn, J. M., Forest, T., Franklin, G., Furget, C., Gaskell, D., Grames, J., Griffioen, K. A., Grimm, K., Guillon, B., Guler, H., Hannelius, L., Hasty, R., Allen, A. H., Horn, T., Johnston, K., Jones, M., Kammel, P., Kazimi, R., King, P. M., Kolarkar, A., Korkmaz, E., Korsch, W., Kox, S., Kuhn, J., Lachniet, J., Lee, L., Lenoble, J., Liatard, E., Liu, J., Loupias, B., Lung, A., Marchand, D., Martin, J. W., McFarlane, K. W., McKee, D. W., McKeown, R. D., Merchez, F., Mkrtchyan, H., Moffit, B., Morlet, M., Nakagawa, I., Nakahara, K., Neveling, R., Ong, S., Page, S., Papavassiliou, V., Pate, S. F., Phillips, S. K., Pitt, M. L., Poelker, M., Porcelli, T. A., Quemener, G., Quinn, B., Ramsay, W. D., Rauf, A. W., Real, J. S., Roche, J., Roos, P., Rutledge, G. A., Secrest, J., Simicevic, N., Smith, G. R., Spayde, D. T., Stepanyan, S., Stutzman, M., Sulkosky, V., Tadevosyan, V., Tieulent, R., de Wiele, J. V., van Oers, W. T. H., Voutier, E., Vulcan, W., Warren, G., Wells, S. P., Williamson, S. E., Wood, S. A., Yan, C., Yun, J., Zeps, V., Physics, Armstrong, D. S., Arvieux, J., Asaturyan, R., Averett, T., Bailey, S. L., Batigne, G., Beck, D. H., Beise, E. J., Benesch, J., Bimbot, L., Birchall, J., Biselli, A., Bosted, P., Boukobza, E., Breuer, H., Carlini, R., Carr, Rachel E., Chant, N., Chao, Y. C., Chattopadhyay, S., Clark, R., Covrig, S., Cowley, A., Dale, D., Davis, C., Falk, W., Finn, J. M., Forest, T., Franklin, G., Furget, C., Gaskell, D., Grames, J., Griffioen, K. A., Grimm, K., Guillon, B., Guler, H., Hannelius, L., Hasty, R., Allen, A. H., Horn, T., Johnston, K., Jones, M., Kammel, P., Kazimi, R., King, P. M., Kolarkar, A., Korkmaz, E., Korsch, W., Kox, S., Kuhn, J., Lachniet, J., Lee, L., Lenoble, J., Liatard, E., Liu, J., Loupias, B., Lung, A., Marchand, D., Martin, J. W., McFarlane, K. W., McKee, D. W., McKeown, R. D., Merchez, F., Mkrtchyan, H., Moffit, B., Morlet, M., Nakagawa, I., Nakahara, K., Neveling, R., Ong, S., Page, S., Papavassiliou, V., Pate, S. F., Phillips, S. K., Pitt, M. L., Poelker, M., Porcelli, T. A., Quemener, G., Quinn, B., Ramsay, W. D., Rauf, A. W., Real, J. S., Roche, J., Roos, P., Rutledge, G. A., Secrest, J., Simicevic, N., Smith, G. R., Spayde, D. T., Stepanyan, S., Stutzman, M., Sulkosky, V., Tadevosyan, V., Tieulent, R., de Wiele, J. V., van Oers, W. T. H., Voutier, E., Vulcan, W., Warren, G., Wells, S. P., Williamson, S. E., Wood, S. A., Yan, C., Yun, J., and Zeps, V.

Abstract

We have measured the beam-normal single-spin asymmetry in elastic scattering of transversely polarized 3 GeV electrons from unpolarized protons at Q(2)=0.15, 0.25 (GeV/c)(2). The results are inconsistent with calculations solely using the elastic nucleon intermediate state and generally agree with calculations with significant inelastic hadronic intermediate state contributions. A(n) provides a direct probe of the imaginary component of the 2 gamma exchange amplitude, the complete description of which is important in the interpretation of data from precision electron-scattering experiments.

Published
2007

45. Strange-Quark Contributions to Parity-Violating Asymmetries in the Forward G0 Electron-Proton Scattering Experiment

Author

Armstrong, D.S., Armstrong, D.S., Arvieux, J., Asaturyan, R., Averett, T., Bailey, S.L., Batigne, G., Beck, D.H., Beise, E.J., Benesch, J., Bimbot, L., Birchall, J., Korsch, W., Kox, S., Kuhn, J., Lachniet, J., Lee, L., Lenoble, J., Liatard, E., Liu, J., Loupias, B., G0 Collaboration, Lung, A., MacLachlan, G.A., Marchand, D., Martin, J.W., McFarlane, K.W., McKee, D.W., McKeown, R.D., Merchez, F., Mkrtchyan, H., Moffit, B., Morlet, M., Nakagawa, I., Nakahara, K., Nakos, M., Neveling, R., Niccolai, S., Ong, S., Page, S., Papavassiliou, V., Pate, S.F., Phillips, S.K., Pitt, M.L., Poelker, M., Porcelli, T.A., Quemener, G., Quinn, B., Ramsay, W.D., Rauf, A.W., Real, J.-S., Roche, J., Roos, P., Rutledge, G.A., Secrest, J., Simicevic, N., Smith, G.R., Spayde, D.T., Stepanyan, S., Stutzman, M., Sulkosky, V., Tadevosyan, V., Tieulent, R., van de Wiele, J., van Oers, W., Voutier, E., Vulcan, W., Warren, G., Wells, S.P., Williamson, S.E., Wood, S.A., Yan, C., Yun, J., Zeps, V., Biselli, A., Bosted, P., Boukobza, E., Breuer, H., Carlini, R., Carr, R., Chant, N., Chao, Y.-C., Chattopadhyay, S., Clark, R., Covrig, S., Cowley, A., Dale, D., Davis, C., Falk, W., Finn, J.M., Forest, T., Franklin, G., Furget, C., Gaskell, D., Grames, J., Griffioen, K.A., Grimm, K., Guillon, B., Guler, H., Hannelius, L., Hasty, R., Hawthorne Allen, A., Horn, T., Johnston, K., Jones, M., Kammel, P., Kazimi, R., King, P.M., Kolarkar, A., Korkmaz, E., Armstrong, D.S., Armstrong, D.S., Arvieux, J., Asaturyan, R., Averett, T., Bailey, S.L., Batigne, G., Beck, D.H., Beise, E.J., Benesch, J., Bimbot, L., Birchall, J., Korsch, W., Kox, S., Kuhn, J., Lachniet, J., Lee, L., Lenoble, J., Liatard, E., Liu, J., Loupias, B., G0 Collaboration, Lung, A., MacLachlan, G.A., Marchand, D., Martin, J.W., McFarlane, K.W., McKee, D.W., McKeown, R.D., Merchez, F., Mkrtchyan, H., Moffit, B., Morlet, M., Nakagawa, I., Nakahara, K., Nakos, M., Neveling, R., Niccolai, S., Ong, S., Page, S., Papavassiliou, V., Pate, S.F., Phillips, S.K., Pitt, M.L., Poelker, M., Porcelli, T.A., Quemener, G., Quinn, B., Ramsay, W.D., Rauf, A.W., Real, J.-S., Roche, J., Roos, P., Rutledge, G.A., Secrest, J., Simicevic, N., Smith, G.R., Spayde, D.T., Stepanyan, S., Stutzman, M., Sulkosky, V., Tadevosyan, V., Tieulent, R., van de Wiele, J., van Oers, W., Voutier, E., Vulcan, W., Warren, G., Wells, S.P., Williamson, S.E., Wood, S.A., Yan, C., Yun, J., Zeps, V., Biselli, A., Bosted, P., Boukobza, E., Breuer, H., Carlini, R., Carr, R., Chant, N., Chao, Y.-C., Chattopadhyay, S., Clark, R., Covrig, S., Cowley, A., Dale, D., Davis, C., Falk, W., Finn, J.M., Forest, T., Franklin, G., Furget, C., Gaskell, D., Grames, J., Griffioen, K.A., Grimm, K., Guillon, B., Guler, H., Hannelius, L., Hasty, R., Hawthorne Allen, A., Horn, T., Johnston, K., Jones, M., Kammel, P., Kazimi, R., King, P.M., Kolarkar, A., and Korkmaz, E.

Abstract

We have measured parity-violating asymmetries in elastic electron-proton scattering over the range of momentum transfers 0.12≤Q2≤1.0 GeV2. These asymmetries, arising from interference of the electromagnetic and neutral weak interactions, are sensitive to strange-quark contributions to the currents of the proton. The measurements were made at Jefferson Laboratory using a toroidal spectrometer to detect the recoiling protons from a liquid hydrogen target. The results indicate nonzero, Q2 dependent, strange-quark contributions and provide new information beyond that obtained in previous experiments.

Published
2005

46. Electroproduction of Strangeness on Light Nuclei

Author

Dohrmann, F., Abbott, D., Ahmidouch, A., Ambrozewicz, P., Armstrong, C. S., Arrington, J., Asaturyan, R., Assamagan, K., Avery, S., Bailey, K., Baker, O. K., Beedoe, S., Bitao, H., Breuer, H., Brown, D. S., Carlini, R., Cha, J., Chant, N., Christy, E., Cochran, A., Cole, L., Collins, G., Cothran, C., Crowder, J., Cummings, W. J., Danagoulian, S., Duncan, F., Dunne, J., Dutta, D., Eden, T., Elaasar, M., Ent, R., Ewell, L., Fenker, H., Fortune, H. T., Fujii, Y., Gan, L., Gao, H., Garrow, K., Geesaman, D. F., Gueye, P., Gustafsson, K., Hafidi, K., Hansen, J. O., Hinton, W., Jackson, H. E., Juengst, H., Keppel, C., Klein, A., Koltenuk, D., Liang, Y., Liu, J. H., Lung, A., Mack, D., Madey, R., Markowitz, P., Martoff, C. J., Meekins, D., Mitchell, J., Miyoshi, T., Mkrtchyan, H., Mohring, R., Mtingwa, S. K., Mueller, B., O'Neill, T. J., Niculescu, G., Niculescu, I., Potterveld, D. H., Price, J. W., Raue, B. A., Reimer, P. E., Reinhold, J., Roche, J., Roos, P., Sarsour, M., Sato, Y., Savage, G., Sawafta, R., Segel, R. E., Semenov, A. Y., Stepanyan, S., Tadevosian, V., Tajima, S., Tang, L., Terburg, B., Uzzle, A., Wood, S., Yamaguchi, H., Yan-1, C., Yan-2, C., Yuan, L., Zeier, M., Zeidman, B., Zihlmann, B., Dohrmann, F., Abbott, D., Ahmidouch, A., Ambrozewicz, P., Armstrong, C. S., Arrington, J., Asaturyan, R., Assamagan, K., Avery, S., Bailey, K., Baker, O. K., Beedoe, S., Bitao, H., Breuer, H., Brown, D. S., Carlini, R., Cha, J., Chant, N., Christy, E., Cochran, A., Cole, L., Collins, G., Cothran, C., Crowder, J., Cummings, W. J., Danagoulian, S., Duncan, F., Dunne, J., Dutta, D., Eden, T., Elaasar, M., Ent, R., Ewell, L., Fenker, H., Fortune, H. T., Fujii, Y., Gan, L., Gao, H., Garrow, K., Geesaman, D. F., Gueye, P., Gustafsson, K., Hafidi, K., Hansen, J. O., Hinton, W., Jackson, H. E., Juengst, H., Keppel, C., Klein, A., Koltenuk, D., Liang, Y., Liu, J. H., Lung, A., Mack, D., Madey, R., Markowitz, P., Martoff, C. J., Meekins, D., Mitchell, J., Miyoshi, T., Mkrtchyan, H., Mohring, R., Mtingwa, S. K., Mueller, B., O'Neill, T. J., Niculescu, G., Niculescu, I., Potterveld, D. H., Price, J. W., Raue, B. A., Reimer, P. E., Reinhold, J., Roche, J., Roos, P., Sarsour, M., Sato, Y., Savage, G., Sawafta, R., Segel, R. E., Semenov, A. Y., Stepanyan, S., Tadevosian, V., Tajima, S., Tang, L., Terburg, B., Uzzle, A., Wood, S., Yamaguchi, H., Yan-1, C., Yan-2, C., Yuan, L., Zeier, M., Zeidman, B., and Zihlmann, B.

Abstract

The A(e,e'K+)YX reaction has been investigated in Hall C at Jefferson Laboratory. Data were taken for Q^2= 0.35 and 0.5 GeV^2 at a beam energy of 3.245 GeV for 1H,2H,3He, 4He targets. The missing mass spectra are fitted with Monte Carlo simulations taking into account the production of Lambda and Sigma0 hyperon production off the proton, and Sigma- off the neutron. Models for quasifree production are compared to the data, excess yields close to threshold are attributed to FSI. Evidence for Lambda-hypernuclear bound states is seen for 3,4 He targets. This is the first time, the electroproduction of these hypernuclei has been measured.

Published
2004

47. Angular distributions for H-3,4(Lambda) bound states in the He-3,He-4(e,e ' K+) reaction

Author

Dohrmann, F., Ahmidouch, A., Armstrong, C. S., Arrington, J., Asaturyan, R., Avery, S., Bailey, K., Baker, O. K., Bitao, H., Breuer, H., Brown, D. S., Carlini, R., Cha, J., Chant, N., Christy, E., Cochran, A., Cole, L., Crowder, J., Danagoulian, S., Elaasar, M., Ent, R., Fenker, H., Fujii, Y., Gan, L., Garrow, K., Geesaman, D. F., Gueye, P., Hafidi, K., Hinton, W., Juengst, H., Keppel, C., Liang, Y., Liu, J. H., Lung, A., Mack, D., Markowitz, P., Mitchell, J., Miyoshi, T., Mkrtchyan, H., Mtingwa, S. K., Mueller, B., Niculescu, G., Niculescu, I., Potterveld, D. H., Raue, B. A., Reimer, P. E., Reinhold, J., Roche, J., Sarsour, M., Sato, Y., Segel, R. E., Semenov, A. Y., Stepanyan, S., Tadevosian, V., Tajima, S., Tang, L., Uzzle, A., Wood, S., Yamaguchi, H., Yan, C., Yuan, L., Zeier, M., Zeidman, B., Zihlmann, B., Dohrmann, F., Ahmidouch, A., Armstrong, C. S., Arrington, J., Asaturyan, R., Avery, S., Bailey, K., Baker, O. K., Bitao, H., Breuer, H., Brown, D. S., Carlini, R., Cha, J., Chant, N., Christy, E., Cochran, A., Cole, L., Crowder, J., Danagoulian, S., Elaasar, M., Ent, R., Fenker, H., Fujii, Y., Gan, L., Garrow, K., Geesaman, D. F., Gueye, P., Hafidi, K., Hinton, W., Juengst, H., Keppel, C., Liang, Y., Liu, J. H., Lung, A., Mack, D., Markowitz, P., Mitchell, J., Miyoshi, T., Mkrtchyan, H., Mtingwa, S. K., Mueller, B., Niculescu, G., Niculescu, I., Potterveld, D. H., Raue, B. A., Reimer, P. E., Reinhold, J., Roche, J., Sarsour, M., Sato, Y., Segel, R. E., Semenov, A. Y., Stepanyan, S., Tadevosian, V., Tajima, S., Tang, L., Uzzle, A., Wood, S., Yamaguchi, H., Yan, C., Yuan, L., Zeier, M., Zeidman, B., and Zihlmann, B.

Abstract

The H-3,4(Lambda) and H-4(Lambda) hypernuclear bound states have been observed for the first time in kaon electroproduction on He-3,He-4 targets. The production cross sections have been determined at Q(2)=0.35 GeV2 and W=1.91 GeV. For either hypernucleus the nuclear form factor is determined by comparing the angular distribution of the He-3,He-4(e,e(')K(+))(Lambda)H-3,H-4 processes to the elementary cross section H-1(e,eK(+))Lambda on the free proton, measured during the same experiment.

Published
2004

48. Separation of the Longitudinal and Transverse Cross Sections in the p(e, e′K+)Λ and p(e, e′K+)Σ0 Reactions

Author

Mohring, R.M., Mohring, R.M., Abbott, D., Ahmidouch, A., Amatuni, A., Ambrozewicz, P., Angelescu, T., Armstrong, C.S., Arrington, J., Assamagan, K., Avery, S., Bailey, K., Beard, K., Beedoe, S., Beise, E.J., Breuer, H., Carlini, R., Cha, J., Change, C.C., Chant, N., Cisbani, E., Collins, G., Cummings, W., Danagoulian, S., De Leo, R., Duncan, F., Dunne, J., Dutta, D., Eden, T., Ent, R., Eyraud, L., Ewell, L., Finn, M., Fortune, T., Frolov, V., Frullani, S., Furget, C., Garibaldi, F., Gaskell, D., Geesaman, D.F., Gueye, P., Gutafsson, K.K., Gensen, J.O., Harvey, M., Hinton, W., Hungerford, E., Iodice, M., Jackson, C., Keppel, C., Kim, W., Kino, K., Koltenuk, D., Kox, S., Kramer, L., Leone, T., Lung, A., Mack, D., Madey, R., Maeda, M., Majewski, S., Markowitz, P., Mart, T., Martoff, C.J., Meekins, D., Mihul, A., Mitchell, J., Mkrtchyan, H., Mtingwa, S., Niculescu, I., Perrino, R., Potterveld, D., Price, J.W., Raue, B.A., Real, J.S., Reinhold, J., Roos, P., Saito, T., Savage, G., Sawafta, R., Segel, R., Stepanyan, S., Stoler, P., Tadevosian, V., Tang, L., Teodorescu, L., Terasawa, T., Tsubota, H., Urciuoli, M., Volmer, J., Vulcan, W., Welch, T.P., Williams, R, Wood, S., Yan, C., Zeidman, B., Mohring, R.M., Mohring, R.M., Abbott, D., Ahmidouch, A., Amatuni, A., Ambrozewicz, P., Angelescu, T., Armstrong, C.S., Arrington, J., Assamagan, K., Avery, S., Bailey, K., Beard, K., Beedoe, S., Beise, E.J., Breuer, H., Carlini, R., Cha, J., Change, C.C., Chant, N., Cisbani, E., Collins, G., Cummings, W., Danagoulian, S., De Leo, R., Duncan, F., Dunne, J., Dutta, D., Eden, T., Ent, R., Eyraud, L., Ewell, L., Finn, M., Fortune, T., Frolov, V., Frullani, S., Furget, C., Garibaldi, F., Gaskell, D., Geesaman, D.F., Gueye, P., Gutafsson, K.K., Gensen, J.O., Harvey, M., Hinton, W., Hungerford, E., Iodice, M., Jackson, C., Keppel, C., Kim, W., Kino, K., Koltenuk, D., Kox, S., Kramer, L., Leone, T., Lung, A., Mack, D., Madey, R., Maeda, M., Majewski, S., Markowitz, P., Mart, T., Martoff, C.J., Meekins, D., Mihul, A., Mitchell, J., Mkrtchyan, H., Mtingwa, S., Niculescu, I., Perrino, R., Potterveld, D., Price, J.W., Raue, B.A., Real, J.S., Reinhold, J., Roos, P., Saito, T., Savage, G., Sawafta, R., Segel, R., Stepanyan, S., Stoler, P., Tadevosian, V., Tang, L., Teodorescu, L., Terasawa, T., Tsubota, H., Urciuoli, M., Volmer, J., Vulcan, W., Welch, T.P., Williams, R, Wood, S., Yan, C., and Zeidman, B.

Abstract

We report measurements of cross sections for the reaction p(e,e′K+)Y, for both the Λ and Σ0 hyperon states, at an invariant mass of W =1.84 GeV and four-momentum transfers 0.5 < Q2 < 2 (GeV/c)2. Data were taken for three values of virtual photon polarization ε, allowing the decom- position of the cross sections into longitudinal and transverse components. The Λ data is a revised analysis of prior work, whereas the Σ0 results have not been previously reported.

Published
2003

49. Electroproduction of Strangeness on Light Nuclei

Author

Dohrmann, F., Abbott, D., Ahmidouch, A., Ambrozewicz, P., Armstrong, C. S., Arrington, J., Asaturyan, R., Assamagan, K., Avery, S., Bailey, K., Baker, O. K., Beedoe, S., Bitao, H., Breuer, H., Brown, D. S., Carlini, R., Cha, J., Chant, N., Christy, E., Cochran, A., Cole, L., Collins, G., Cothran, C., Crowder, J., Cummings, W. J., Danagoulian, S., Duncan, F., Dunne, J., Dutta, D., Eden, T., Elaasar, M., Ent, R., Ewell, L., Fenker, H., Fortune, H. T., Fujii, Y., Gan, L., Gao, H., Garrow, K., Geesaman, D. F., Gueye, P., Gustafsson, K., Hafidi, K., Hansen, J. O., Hinton, W., Jackson, H. E., Juengst, H., Keppel, C., Klein, A., Koltenuk, D., Liang, Y., Liu, J. H., Lung, A., Mack, D., Madey, R., Markowitz, P., Martoff, C. J., Meekins, D., Mitchell, J., Miyoshi, T., Mkrtchyan, H., Mohring, R., Mtingwa, S. K., Mueller, B., O'Neill, T. J., Niculescu, G., Niculescu, I., Potterveld, D. H., Price, J. W., Raue, B. A., Reimer, P. E., Reinhold, J., Roche, J., Roos, P., Sarsour, M., Sato, Y., Savage, G., Sawafta, R., Segel, R. E., Semenov, A. Y., Stepanyan, S., Tadevosian, V., Tajima, S., Tang, L., Terburg, B., Uzzle, A., Wood, S., Yamaguchi, H., Yan-1, C., Yan-2, C., Yuan, L., Zeier, M., Zeidman, B., Zihlmann, B., Dohrmann, F., Abbott, D., Ahmidouch, A., Ambrozewicz, P., Armstrong, C. S., Arrington, J., Asaturyan, R., Assamagan, K., Avery, S., Bailey, K., Baker, O. K., Beedoe, S., Bitao, H., Breuer, H., Brown, D. S., Carlini, R., Cha, J., Chant, N., Christy, E., Cochran, A., Cole, L., Collins, G., Cothran, C., Crowder, J., Cummings, W. J., Danagoulian, S., Duncan, F., Dunne, J., Dutta, D., Eden, T., Elaasar, M., Ent, R., Ewell, L., Fenker, H., Fortune, H. T., Fujii, Y., Gan, L., Gao, H., Garrow, K., Geesaman, D. F., Gueye, P., Gustafsson, K., Hafidi, K., Hansen, J. O., Hinton, W., Jackson, H. E., Juengst, H., Keppel, C., Klein, A., Koltenuk, D., Liang, Y., Liu, J. H., Lung, A., Mack, D., Madey, R., Markowitz, P., Martoff, C. J., Meekins, D., Mitchell, J., Miyoshi, T., Mkrtchyan, H., Mohring, R., Mtingwa, S. K., Mueller, B., O'Neill, T. J., Niculescu, G., Niculescu, I., Potterveld, D. H., Price, J. W., Raue, B. A., Reimer, P. E., Reinhold, J., Roche, J., Roos, P., Sarsour, M., Sato, Y., Savage, G., Sawafta, R., Segel, R. E., Semenov, A. Y., Stepanyan, S., Tadevosian, V., Tajima, S., Tang, L., Terburg, B., Uzzle, A., Wood, S., Yamaguchi, H., Yan-1, C., Yan-2, C., Yuan, L., Zeier, M., Zeidman, B., and Zihlmann, B.

Abstract

The A(e,e'K+)YX reaction has been investigated in Hall C at Jefferson Laboratory. Data were taken for Q^2= 0.35 and 0.5 GeV^2 at a beam energy of 3.245 GeV for 1H,2H,3He, 4He targets. The missing mass spectra are fitted with Monte Carlo simulations taking into account the production of Lambda and Sigma0 hyperon production off the proton, and Sigma- off the neutron. Models for quasifree production are compared to the data, excess yields close to threshold are attributed to FSI. Evidence for Lambda-hypernuclear bound states is seen for 3,4 He targets. This is the first time, the electroproduction of these hypernuclei has been measured.

Published
2003

50. Quasielastic (e,e′p) reaction on 12C,56Fe, and 197Au

Author

Dutta, D., Dutta, D., van Westrum, D., Abbott, D., Ahmidouch, A., Amatuni, A., Armstrong, C., Arrington, J., Assamagan, K.A., Bailey, K., Baker, O.K., Barrow, S., Beard, K., Beatty, D., Beedoe, S., Beise, E., Belz, E., Bochna, C., Bosted, P.E., Breuer, H., Bruins, E.E.W., Carlini, R., Cha, J., Chant, N., Cothran, C., Cummings, W.J., Danagoulian, S., Day, D., DeSchepper, D., Ducret, J.-E., Duncan, F., Dunne, J., Eden, T., Ent, R., Fortune, H.T., Frolov, V., Geesaman, D.F., Gao, H., Gilman, R., Gueye, P., Hansen, J.O., Hinton, W., Holt, R.J., Jackson, C., Jackson, H.E., Jones, C., Kaufman, S., Kelly, J.J., Keppel, C., Khandaker, M., Kim, W., Kinney, A., Klein, A., Koltenuk, D., Kramer, L., Lorenzon, W., Lung, A., McFarlane, K., Mack, D.J., Madey, R., Markowitz, P., Martin, J., Mateos, A., Meekins, D., Miller, M.A., Milner, R., Mitchell, J., Mohring, R., Mkrtchyan, H., Nathan, A.M., Niculescu, G., Niculescu, I., O'Neill, T.G., Potterveld, D., Price, J.W., Reinhold, J., Salgado, C., Schiffer, J.P., Segel, R.E., Stoler, P., Suleiman, R., Tadevosyan, V., Tang, L., Terburg, B., Welch, T.P., Williamson, C., Wood, S., Yan, C., Yang, J.-C., Yu, J., Zeidman, B., Zhao, W., Zihlmann, B., Dutta, D., Dutta, D., van Westrum, D., Abbott, D., Ahmidouch, A., Amatuni, A., Armstrong, C., Arrington, J., Assamagan, K.A., Bailey, K., Baker, O.K., Barrow, S., Beard, K., Beatty, D., Beedoe, S., Beise, E., Belz, E., Bochna, C., Bosted, P.E., Breuer, H., Bruins, E.E.W., Carlini, R., Cha, J., Chant, N., Cothran, C., Cummings, W.J., Danagoulian, S., Day, D., DeSchepper, D., Ducret, J.-E., Duncan, F., Dunne, J., Eden, T., Ent, R., Fortune, H.T., Frolov, V., Geesaman, D.F., Gao, H., Gilman, R., Gueye, P., Hansen, J.O., Hinton, W., Holt, R.J., Jackson, C., Jackson, H.E., Jones, C., Kaufman, S., Kelly, J.J., Keppel, C., Khandaker, M., Kim, W., Kinney, A., Klein, A., Koltenuk, D., Kramer, L., Lorenzon, W., Lung, A., McFarlane, K., Mack, D.J., Madey, R., Markowitz, P., Martin, J., Mateos, A., Meekins, D., Miller, M.A., Milner, R., Mitchell, J., Mohring, R., Mkrtchyan, H., Nathan, A.M., Niculescu, G., Niculescu, I., O'Neill, T.G., Potterveld, D., Price, J.W., Reinhold, J., Salgado, C., Schiffer, J.P., Segel, R.E., Stoler, P., Suleiman, R., Tadevosyan, V., Tang, L., Terburg, B., Welch, T.P., Williamson, C., Wood, S., Yan, C., Yang, J.-C., Yu, J., Zeidman, B., Zhao, W., and Zihlmann, B.

Abstract

We report the results from a systematic study of the quasielastic (e,e′p) reaction on 12C, 56Fe, and 197Au performed at Jefferson Lab. We have measured nuclear transparency and extracted spectral functions (corrected for radiation) over a Q2 range of 0.64–3.25 (GeV∕c)2 for all three nuclei. In addition, we have extracted separated longitudinal and transverse spectral functions at Q2 of 0.64 and 1.8 (GeV∕c)2 for these three nuclei (except for 197Au at the higher Q2). The spectral functions are compared to a number of theoretical calculations. The measured spectral functions differ in detail but not in overall shape from most of the theoretical models. In all three targets the measured spectral functions show considerable excess transverse strength at Q2=0.64 (GeV∕c)2, which is much reduced at 1.8 (GeV∕c)2.

Published
2003

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