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11 results on '"Chant, N."'

1. 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

2. 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

3. 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

4. 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

5. 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

6. 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

7. Measurement of longitudinal and transverse cross sections in the 3He(e,e′π+)3H reaction at W=1.6 GeV

Author

Gaskell, D., Gaskell, D., Ahmidouch, A., Ambrozewicz, P., Anklin, H., Arrington, J., 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., De Schepper, D., Dunne, J., Dutta, D., Ent, R., Gan, L., 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., 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., Van Westrum, D., Volmer, J., Welch, T.P., Wood, S., Yuan, L., Zeidman, B., Zihlmann, B., Gaskell, D., Gaskell, D., Ahmidouch, A., Ambrozewicz, P., Anklin, H., Arrington, J., 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., De Schepper, D., Dunne, J., Dutta, D., Ent, R., Gan, L., 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., 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., Van Westrum, D., Volmer, J., Welch, T.P., Wood, S., Yuan, L., Zeidman, B., and Zihlmann, B.

Abstract

The coherent 3He(e,e′π+)3H reaction was measured at Q2=0.4 (GeV/c)2 and W=1.6 GeV for two values of the virtual photon polarization, ε, allowing the separation of longitudinal and transverse cross sections. The results from the coherent process on 3He were compared to H(e,e′π+)n data taken at the same kinematics. This marks the first direct comparison of these processes. At these kinematics (pπ=1.1 GeV/c), pion rescattering from the spectator nucleons in the 3He(e,e′π+)3H process is expected to be small, simplifying the comparison to π+ production from the free proton.

Published
2001

8. Longitudinal Electroproduction of Charged Pions from 1H, 2H, and 3He

Author

Gaskell, D., Gaskell, D., Ahmidouch, A., Ambrozewicz, P., Anklin, H., Arrington, J., 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., DeSchepper, D., Dunne, J., Dutta, D., Ent, R., Gan, L., 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., van Westrum, D., Volmer, J., Welch, T.P., Wood, S., Yuan, L., Zeidman, B., Zihlmann, B., Gaskell, D., Gaskell, D., Ahmidouch, A., Ambrozewicz, P., Anklin, H., Arrington, J., 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., DeSchepper, D., Dunne, J., Dutta, D., Ent, R., Gan, L., 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., van 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 1H, 2H, and 3He were measured at Q2 = 0.4(GeV/c)2 for two values of the invariant mass, W = 1.15GeV and W = 1.60GeV, 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 3He at W = 1.60GeV. The W = 1.15GeV results are consistent with simple estimates of the effect of nuclear pion currents, but are also consistent with pure quasifree production.

Published
2001

9. Separated spectral functions for the quasifree 12C(e,e′p) reaction

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., Chrien, R.E., 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., Gue`ye, 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, E., Klein, A., Koltenuk, D., Kramer, L., Lorenzon, W., McFarlane, K., Mack, D.J., Madey, R., Markowitz, P., Martin, J., Mateos, A., Meekins, D., Meier, E., 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., Sawafta, R., Sutter, R.J., Tadevosyan, V., Tang, L., Terburg, B., Welch, T.P., Williamson, C., Wood, S., Yan, C., Jae-Choon, Yang, 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., Chrien, R.E., 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., Gue`ye, 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, E., Klein, A., Koltenuk, D., Kramer, L., Lorenzon, W., McFarlane, K., Mack, D.J., Madey, R., Markowitz, P., Martin, J., Mateos, A., Meekins, D., Meier, E., 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., Sawafta, R., Sutter, R.J., Tadevosyan, V., Tang, L., Terburg, B., Welch, T.P., Williamson, C., Wood, S., Yan, C., Jae-Choon, Yang, Yu, J., Zeidman, B., Zhao, W., and Zihlmann, B.

Abstract

A separation of the longitudinal and transverse 12C(e,e′p) cross sections in the quasifree region has been performed in parallel kinematics at Q2 of 0.64 and 1.8 GeV2 for initial proton momentum <80 MeV. The separated transverse and longitudinal spectral functions at Q2=0.64GeV2 show significant differences for missing energy between 25 and 60 MeV indicating a breakdown in the single nucleon knockout picture. The transverse spectral functions exhibit definite momentum transfer dependence.

Published
2000

10. Longitudinal and Transverse Cross Sections in the 1H(e,e′K+)Λ Reaction

Author

Niculsescu, G., Niculsescu, G., Mohring, R.M., Gueye, P., Abbott, D., Ahmidouch, A., Amatuni, Ts.A., Ambrozewicz, P., Angelescu, T., Armstrong, C.S., Assamagan, K., Avery, S., Bailey, K., Baker, O.K., Beard, K., Beedoe, S., Beise, E., Breuer, H., Carlini, R., Cha, J., Chang, C.C., Chant, N., Cisbani, E., Collins, G., Cummings, W., Danagoulian, S., DeLeo, 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., 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., Lolos, G., Lung, A., Mack, D., Madey, R., Maeda, M., Majewski, S., Markowitz, P., 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, P., Williams, R., Wood, S., Yan, C., Zeidman, B., Niculsescu, G., Niculsescu, G., Mohring, R.M., Gueye, P., Abbott, D., Ahmidouch, A., Amatuni, Ts.A., Ambrozewicz, P., Angelescu, T., Armstrong, C.S., Assamagan, K., Avery, S., Bailey, K., Baker, O.K., Beard, K., Beedoe, S., Beise, E., Breuer, H., Carlini, R., Cha, J., Chang, C.C., Chant, N., Cisbani, E., Collins, G., Cummings, W., Danagoulian, S., DeLeo, 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., 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., Lolos, G., Lung, A., Mack, D., Madey, R., Maeda, M., Majewski, S., Markowitz, P., 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, P., Williams, R., Wood, S., Yan, C., and Zeidman, B.

Abstract

The 1H(e,e′K+)Λ reaction was studied as a function of the squared four-momentum transfer, Q2, and the virtual photon polarization, ɛ. For each of four Q2 settings, 0.52, 0.75, 1.00, and 2.00 (GeV/c)2, the longitudinal and transverse virtual photon cross sections were extracted in measurements at three virtual photon polarizations. The Q2 dependence of the σL/σT ratio differs significantly from current theoretical predictions. This, combined with the precision of the measurement, implies a need for revision of existing calculations.

Published
1998

11. Quasifree (e,e′p) Reactions and Proton Propagation in Nuclei

Author

Abbott, D., Abbott, D., Ahmidouch, A., Amatuni, Ts. 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., 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., Dutta, D., 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.E., Kaufman, S., Kelly, J.J., Keppel, C., Khandaker, M., Kim, W., Kinney, E., Klein, A., Koltenuk, D., Kramer, L., Lorenzon, W., 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.O., Segel, R.E., Stoler, P., Suleiman, R., Tadevosyan, V., Tang, L., Terburg, B., van Westrum, D., Welch, P., Williamson, C., Wood, S., Yan, C., Yang, Jae-Choon, Yu, J., Zeidman, B., Zhao, W., Zihlmann, B., Abbott, D., Abbott, D., Ahmidouch, A., Amatuni, Ts. 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., 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., Dutta, D., 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.E., Kaufman, S., Kelly, J.J., Keppel, C., Khandaker, M., Kim, W., Kinney, E., Klein, A., Koltenuk, D., Kramer, L., Lorenzon, W., 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.O., Segel, R.E., Stoler, P., Suleiman, R., Tadevosyan, V., Tang, L., Terburg, B., van Westrum, D., Welch, P., Williamson, C., Wood, S., Yan, C., Yang, Jae-Choon, Yu, J., Zeidman, B., Zhao, W., and Zihlmann, B.

Abstract

The ( e,e′p) reaction was studied on targets of C, Fe, and Au at momentum transfers squared Q2 of 0.6, 1.3, 1.8, and 3.3 GeV2 in a region of kinematics dominated by quasifree electron-proton scattering. Missing energy and missing momentum distributions are reasonably well described by plane wave impulse approximation calculations with Q2 and A dependent corrections that measure the attenuation of the final state protons.

Published
1998

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