Search

Your search keyword '"CARMAN, D.S."' showing total 8 results
Start Over Author "CARMAN, D.S." Publisher elsevier
8 results on '"CARMAN, D.S."'

1. A multidimensional study of the structure function ratio From Hard Exclusive electro-production off protons in the GPD regime

Author

Diehl, S., Kim, A., Joo, K., Achenbach, P., Akbar, Z., Amaryan, M.J., Atac, H., Avagyan, H., Ayerbe Gayoso, C., Baashen, L., Barion, L., Bashkanov, M., Battaglieri, M., Bedlinskiy, I., Benkel, B., Benmokhtar, F., Bianconi, A., Biselli, A.S., Bondi, M., Booth, W.A., Bossù, F., Boiarinov, S., Brinkmann, K.-Th., Briscoe, W.J., Bueltmann, S., Bulumulla, D., Burkert, V.D., Carman, D.S., Celentano, A., Chatagnon, P., Chesnokov, V., Chetry, T., Ciullo, G., Clash, G., Cole, P.L., Contalbrigo, M., Costantini, G., D'Angelo, A., Dashyan, N., De Vita, R., Defurne, M., Deur, A., Djalali, C., Dupre, R., Egiyan, H., Ehrhart, M., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Fegan, S., Filippi, A., Gavalian, G., Ghandilyan, Y., Gilfoyle, G.P., Glazier, D.I., Golubenko, A.A., Gosta, G., Gothe, R.W., Gotra, Y., Griffioen, K.A., Guidal, M., Hafidi, K., Hakobyan, H., Hattawy, M., Hayward, T.B., Heddle, D., Hobart, A., Holtrop, M., Ilieva, Y., Ireland, D.G., Isupov, E.L., Jo, H.S., Khachatryan, M., Khanal, A., Kim, W., Kripko, A., Kubarovsky, V., Lagerquist, V., Laget, J.M., Lanza, L., Leali, M., Lee, S., Lenisa, P., Li, X., Livingston, K., J .D. MacGregor, I., Marchand, D., Mascagna, V., McKinnon, B., Meziani, Z.E., Migliorati, S., Mineeva, T., Mirazita, M., Mokeev, V., Molina, E., Montgomery, R.A., Munoz Camacho, C., Nadel-Turonski, P., Naidoo, P., Neupane, K., Niccolai, S., Nicol, M., Niculescu, G., Osipenko, M., Ouillon, M., Pandey, P., Paolone, M., Pappalardo, L.L., Paremuzyan, R., Pasyuk, E., Paul, S.J., Phelps, W., Pilleux, N., Pokhrel, M., Poudel, J., Price, J.W., Prok, Y., Reed, T., Richards, J., Ripani, M., Ritman, J., Rossi, P., Sabatié, F., Salgado, C., Schadmand, S., Schmidt, A., Sharabian, Y., Shirokov, E.V., Shrestha, U., Simmerling, P., Sokhan, D., Sparveris, N., Spreafico, M., Stepanyan, S., Strakovsky, I.I., Strauch, S., Tan, J.A., Trotta, N., Turisini, M., Tyson, R., Ungaro, M., Vallarino, S., Venturelli, L., Voskanyan, H., Voutier, E., Watts, D.P., Wei, X., Williams, R., Wishart, R., Wood, M.H., Zachariou, N., Zhang, J., Zhao, Z.W., and Zurek, M.

Abstract

A multidimensional extraction of the structure function ratio σLT′/σ0 from the hard exclusive e→p→e′nπ+ reaction above the resonance region has been performed. The study was done based on beam-spin asymmetry measurements using a 10.6 GeV incident electron beam on a liquid-hydrogen target and the CLAS12 spectrometer at Jefferson Lab. The measurements focus on the very forward regime (t/Q2 ≪ 1) with a wide kinematic range of xB in the valence regime (0.17 < xB < 0.55), and virtualities Q2 ranging from 1.5 GeV$^{2}$ up to 6 GeV$^{2}$. The results and their comparison to theoretical models based on Generalized Parton Distributions demonstrate the sensitivity to chiral-odd GPDs and the directly related tensor charge of the nucleon. In addition, the data is compared to an extension of a Regge formalism at high photon virtualities. It was found that the Regge model provides a better description at low Q2, while the GPD model is more appropriate at high Q2.

Published
2023

2. C(e,e'pN) measurements of short range correlations in the tensor-to-scalar interaction transition region

Author

Korover, I., Pybus, J.R., Schmidt, A., Hauenstein, F., Duer, M., Hen, O., Piasetzky, E., Weinstein, L.B., Higinbotham, D.W., Adhikari, S., Adhikari, K., Amaryan, M.J., Angelini, Giovanni, Atac, H., Barion, L., Battaglieri, M., Beck, A., Bedlinskiy, I., Benmokhtar, Fatiha, Bianconi, A., Biselli, A.S., Boiarinov, S., Briscoe, W.J., Brooks, W.K., Bulumulla, D., Burkert, V.D., Carman, D.S., Celentano, A., Chatagnon, P., Chetry, T., Clark, L., Clary, B., Cole, P.L., Contalbrigo, M., Crede, V., Cruz-Torres, R., D'Angelo, A., De Vita, R., Defurne, M., Denniston, A., Deur, A., Diehl, S., Djalali, C., Dupre, R., Egiyan, H., Ehrhart, M., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fersch, R., Filippi, A., Forest, T., Gavalian, G., Girod, F.X., Golovatch, E., Gothe, R.W., Griffioen, K.A., Guidal, M., Hafidi, K., Hakobyan, H., Harrison, N., Hattawy, M., Hayward, T.B., Heddle, D., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D.G., Isupov, E.L., Jenkins, D., Jo, H.S., Joo, K., Joosten, S., Keller, D., Khachatryan, M., Khanal, A., Khandaker, M., Kim, A., Kim, C.W., Klein, F.J., Kubarovsky, V., Lanza, L., Leali, M., Lenisa, P., Livingston, K., Lucherini, V., MacGregor, I.J.D., Marchand, D., Markov, N., Marsicano, L., Mascagna, V., McKinnon, B., Mey-Tal Beck, S., Mineeva, T., Mirazita, M., Movsisyan, A., Munoz Camacho, C., Mustapha, B., Nadel-Turonski, P., Neupane, K., Niculescu, G., Osipenko, M., Ostrovidov, A.I., Paolone, M., Pappalardo, L.L., Paremuzyan, R., Pasyuk, E., Phelps, W., Pogorelko, O., Price, J.W., Prok, Y., Protopopescu, D., Raue, B.A., Ripani, M., Ritman, J., Rizzo, A., Rosner, G., Rowley, J., Sabatié, F., Salgado, C., Schumacher, R.A., Segarra, E.P., Sharabian, Y.G., Shrestha, U., Sokhan, D., Soto, O., Sparveris, N., Stepanyan, S., Strakovsky, I.I., Strauch, S., Tan, J.A., Tyler, N., Ungaro, M., Venturelli, L., Voskanyan, H., Voutier, E., Wang, T., Watts, D., Wei, X., Wood, M.H., Zachariou, N., Zhang, J., Zhao, Z.W., and Zheng, X.

Abstract

High-momentum configurations of nucleon pairs at short-distance are probed using measurements of the $^{12}$C(e,e′p) and $^{12}$C(e,e′pN) reactions (where N is either n or p), at high-Q2 and xB>1.1. The data span a missing-momentum range of 300–1000 MeV/c and are predominantly sensitive to the transition region of the strong nuclear interaction from a Tensor to Scalar interaction. The data are well reproduced by theoretical calculations using the Generalized Contact Formalism with both chiral and phenomenological nucleon-nucleon (NN) interaction models. This agreement suggests that the measured high missing-momentum protons up to 1000 MeV/c predominantly belong to short-ranged correlated (SRC) pairs. The measured $^{12}$C(e,e′pN) / $^{12}$C(e,e′p) and $^{12}$C(e,e′pp) / $^{12}$C(e,e′pn) cross-section ratios are consistent with a decrease in the fraction of proton-neutron SRC pairs and increase in the fraction of proton-proton SRC pairs with increasing missing momentum. This confirms the transition from an isospin-dependent tensor NN interaction at ∼400 MeV/c to an isospin-independent scalar interaction at high-momentum around ∼800 MeV/c as predicted by theoretical calculation.

Published
2021

3. Measurement of the beam spin asymmetry of e→p→e′p′η in the deep-inelastic regime with CLAS

Author

Zhao, B., Kim, A., Joo, K., Bedlinskiy, I., Kim, W., Kubarovsky, V., Ungaro, M., Adhikari, S., Akbar, Z., Angelini, G., Avakian, H., Ball, J., Baltzell, N.A., Barion, L., Bashkanov, M., Battaglieri, M., Batourine, V., Biselli, A.S., Boiarinov, S., Briscoe, W.J., Brooks, W.K., Burkert, V.D., Carman, D.S., Celentano, A., Chatagnon, P., Chetry, T., Ciullo, G., Clark, L., Clary, B.A., Cole, P.L., Contalbrigo, M., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Defurne, M., Deur, A., Diehl, S., Djalali, C., Dupre, R., Egiyan, H., Ehrhart, M., El Alaoui, A., El Fassi, L., Eugenio, P., Filippi, A., Forest, T.A., Gavalian, G., Ghandilyan, Y., Gilfoyle, G.P., Girod, F.X., Golovatch, E., Gothe, R.W., Griffioen, K.A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Harrison, N., Hattawy, M., Heddle, D., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D.G., Ishkhanov, B.S., Isupov, E.L., Jenkins, D., Jo, H.S., Johnston, S., Kabir, M.L., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Klein, A., Klein, F.J., Kuhn, S.E., Kuleshov, S.V., Lanza, L., Lenisa, P., Livingston, K., MacGregor, I.J.D., Marchand, D., Markov, N., McKinnon, B., Meyer, C.A., Meziani, Z.E., Mirazita, M., Mokeev, V., Montgomery, R.A., Munoz Camacho, C., Nadel-Turonski, P., Niccolai, S., Niculescu, G., Osipenko, M., Ostrovidov, A.I., Paolone, M., Paremuzyan, R., Park, K., Pogorelko, O., Price, J.W., Prok, Y., Protopopescu, D., Ripani, M., Rizzo, A., Rosner, G., Rossi, P., Sabatié, F., Salgado, C., Schumacher, R.A., Sharabian, Y.G., Skorodumina, Iu., Smith, G.D., Sokhan, D., Sparveris, N., Stepanyan, S., Strakovsky, I.I., Strauch, S., Taiuti, M., Tan, J.A., Voskanyan, H., Voutier, E., Wang, R., Wei, X., Wood, M.H., Zachariou, N., Zhang, J., and Zhao, Z.W.

Subjects
Nucleon structure, Deeply Virtual Meson Production, Chiral-odd generalized parton distributions, High Energy Physics::Phenomenology, Chiral-odd generalized parton distributions, CLAS collaboration, Deeply Virtual Meson Production, Nucleon structure, Socio-culturale, CLAS collaboration, High Energy Physics::Experiment, Nuclear Experiment, lcsh:Physics, lcsh:QC1-999, Settore FIS/04 - Fisica Nucleare e Subnucleare
Abstract

The beam spin asymmetry of the exclusive pseudoscalar channel e→p→e′p′η was measured for the first time in the deep-inelastic regime (W>2 GeV/c2 and Q2>1 GeV2/c2) using a longitudinally polarized 5.78 GeV electron beam at Jefferson Lab with the CEBAF Large Acceptance Spectrometer. The data were accumulated in 144 four-dimensional bins of Q2, xB, −t and ϕ over a wide kinematic range, where ϕ is the azimuthal angle between the lepton and hadron scattering planes, The measured azimuthal dependence with large amplitudes of the sin⁡ϕ moments is a clear indication of a substantial contribution to the polarized cross-section from transversely polarized virtual photons. In the framework of generalized parton distributions (GPDs) this contribution is expressed via longitudinal-transverse interference between chiral-even and chiral-odd GPDs. The experimental results are compared to the existing theoretical models demonstrating the sensitivity to the product of chiral-odd and chiral-even GPDs and provide new constraints to the existing GPD parameterizations. Keywords: Nucleon structure, CLAS collaboration, Deeply Virtual Meson Production, Chiral-odd generalized parton distributions

Published
2019

4. Measurement of the beam spin asymmetry of in the deep-inelastic regime with CLAS

Author

Zhao, B., Kim, A., Joo, K., Bedlinskiy, I., Kim, W., Kubarovsky, V., Ungaro, M., Adhikari, S., Akbar, Z., Angelini, G., Avakian, H., Ball, J., Baltzell, N.A., Barion, L., Bashkanov, M., Battaglieri, M., Batourine, V., Biselli, A.S., Boiarinov, S., Briscoe, W.J., Brooks, W.K., Burkert, V.D., Carman, D.S., Celentano, A., Chatagnon, P., Chetry, T., Ciullo, G., Clark, L., Clary, B.A., Cole, P.L., Contalbrigo, M., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Defurne, M., Deur, A., Diehl, S., Djalali, C., Dupre, R., Egiyan, H., Ehrhart, M., El Alaoui, A., El Fassi, L., Eugenio, P., Filippi, A., Forest, T.A., Gavalian, G., Ghandilyan, Y., Gilfoyle, G.P., Girod, F.X., Golovatch, E., Gothe, R.W., Griffioen, K.A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Harrison, N., Hattawy, M., Heddle, D., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D.G., Ishkhanov, B.S., Isupov, E.L., Jenkins, D., Jo, H.S., Johnston, S., Kabir, M.L., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Klein, A., Klein, F.J., Kuhn, S.E., Kuleshov, S.V., Lanza, L., Lenisa, P., Livingston, K., MacGregor, I.J.D., Marchand, D., Markov, N., McKinnon, B., Meyer, C.A., Meziani, Z.E., Mirazita, M., Mokeev, V., Montgomery, R.A., Munoz Camacho, C., Nadel-Turonski, P., Niccolai, S., Niculescu, G., Osipenko, M., Ostrovidov, A.I., Paolone, M., Paremuzyan, R., Park, K., Pogorelko, O., Price, J.W., Prok, Y., Protopopescu, D., Ripani, M., Rizzo, A., Rosner, G., Rossi, P., Sabatié, F., Salgado, C., Schumacher, R.A., Sharabian, Y.G., Skorodumina, Iu., Smith, G.D., Sokhan, D., Sparveris, N., Stepanyan, S., Strakovsky, I.I., Strauch, S., Taiuti, M., Tan, J.A., Voskanyan, H., Voutier, E., Wang, R., Wei, X., Wood, M.H., Zachariou, N., Zhang, J., and Zhao, Z.W.

Abstract

The beam spin asymmetry of the exclusive pseudoscalar channel e→p→e′p′η was measured for the first time in the deep-inelastic regime (W>2 GeV/c2 and Q2>1 GeV2/c2) using a longitudinally polarized 5.78 GeV electron beam at Jefferson Lab with the CEBAF Large Acceptance Spectrometer. The data were accumulated in 144 four-dimensional bins of Q2, xB, −t and ϕ over a wide kinematic range, where ϕ is the azimuthal angle between the lepton and hadron scattering planes, The measured azimuthal dependence with large amplitudes of the sin⁡ϕ moments is a clear indication of a substantial contribution to the polarized cross-section from transversely polarized virtual photons. In the framework of generalized parton distributions (GPDs) this contribution is expressed via longitudinal-transverse interference between chiral-even and chiral-odd GPDs. The experimental results are compared to the existing theoretical models demonstrating the sensitivity to the product of chiral-odd and chiral-even GPDs and provide new constraints to the existing GPD parameterizations.

Published
2019

5. First results on nucleon resonance photocouplings from the γp → π+π−p reaction

Author

Golovatch, E., Burkert, V.D., Carman, D.S., Gothe, R.W., Hicks, K., Ishkhanov, B.S., Mokeev, V.I., Pasyuk, E., Adhikari, S., Akbar, Z., Amaryan, M.J., Avakian, H., Ball, J., Barion, L., Bashkanov, M., Battaglieri, M., Bedlinskiy, I., Biselli, A.S., Boiarinov, S., Briscoe, W.J., Cao, F., Celentano, A., Chatagnon, P., Chetry, T., Ciullo, G., Clark, L., Clary, B.A., Cole, P.L., Contalbrigo, M., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Defurne, M., Deur, A., Diehl, S., Djalali, C., Dugger, M., Dupre, R., Egiyan, H., Ehrhart, M., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fedotov, G., Fersch, R., Filippi, A., Ghandilyan, Y., Gilfoyle, G.P., Giovanetti, K.L., Girod, F.X., Glazier, D.I., Griffioen, K.A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Harrison, N., Hattawy, M., Heddle, D., Holtrop, M., Ilieva, Y., Ireland, D.G., Isupov, E.L., Jenkins, D., Jo, H.S., Johnston, S., Joo, K., Kabir, M.L., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Kim, W., Klein, A., Klein, F.J., Kubarovsky, V., Lanza, L., Lenisa, P., Livingston, K., MacGregor, I.J.D., Marchand, D., Markov, N., McKinnon, B., Meyer, C.A., Montgomery, R.A., Movsisyan, A., Munoz Camacho, C., Nadel-Turonski, P., Niccolai, S., Niculescu, G., Osipenko, M., Ostrovidov, A.I., Paolone, M., Paremuzyan, R., Park, K., Pogorelko, O., Price, J.W., Prok, Y., Protopopescu, D., Ripani, M., Riser, D., Rizzo, A., Rosner, G., Sabatié, F., Salgado, C., Schumacher, R.A., Sharabian, Y.G., Skorodumina, Iu., Smith, G.D., Sober, D.I., Sokhan, D., Sparveris, N., Strakovsky, I.I., Strauch, S., Taiuti, M., Tan, J.A., Tyler, N., Ungaro, M., Voskanyan, H., Voutier, E., Wang, R., Wei, X., Wood, M.H., Zachariou, N., Zhang, J., and Zhao, Z.W.

Abstract

No abstract available.

Published
2019

6. Differential cross section for γd → ωd using CLAS at Jefferson Lab

Author

Chetry, T., Hicks, K., Compton, N., Sargsian, M., Adhikari, S., Ball, J., Balossino, I., Barion, L., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A.S., Boiarinov, S., Briscoe, W.J., Brooks, W.K., Burkert, V.D., Carman, D.S., Celentano, A., Charles, G., Ciullo, G., Clark, L., Clary, Brandon A., Cole, P.L., Contalbrigo, M., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Dupre, R., El Alaoui, A., El Fassi, L., Eugenio, P., Fedotov, G., Fersch, R., Filippi, A., Gavalian, G., Ghandilyan, Y., Giovanetti, K.L., Girod, F.X., Golovatch, E., Gothe, R.W., Griffioen, K.A., Guo, L., Hafidi, K., Harrison, N., Hattawy, M., Holtrop, M., Ilieva, Y., Ireland, D.G., Ishkhanov, B.S., Isupov, E.L., Jenkins, D., Johnston, S., Kabir, M.L., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Kim, A., Kim, W., Klein, F.J., Kubarovsky, V., Lanza, L., Lenisa, P., Livingston, K., MacGregor, I.J.D., Markov, N., McKinnon, B., Mokeev, V., Movsisyan, A., Munoz Camacho, C., Nadel-Turonski, P., Niccolai, S., Niculescu, G., Osipenko, M., Ostrovidov, A.I., Paolone, M., Paremuzyan, R., Park, K., Pasyuk, E., Phelps, W., Pogorelko, O., Price, J.W., Prok, Y., Ripani, M., Riser, D., Ritchie, B.G., Rizzo, A., Rosner, G., Salgado, C., Schumacher, R.A., Skorodumina, Iu., Smith, G.D., Sober, D.I., Sokhan, D., Sparveris, N., Stepanyan, S., Strakovsky, I.I., Strauch, S., Taiuti, M., Tan, J.A., Ungaro, M., Voskanyan, H., Voutier, E., Weinstein, L.B., Wood, M.H., Zachariou, N., Zhang, J., and Zhao, Z.W.

Abstract

The cross section for coherent ω-meson photoproduction off the deuteron has been measured for the\ud first time as a function of the momentum transfer t = (Pγ − Pω)2 and photon energy Eγ using the CLAS\ud detector at the Thomas Jefferson National Accelerator Facility. The cross sections are measured in the\ud energy range 1.4 < Eγ < 3.4 GeV. A model based on ω − N rescattering is consistent with the data at\ud low and intermediate momentum transfer, |t|. For 2.8 < Eγ < 3.4 GeV, the total cross-section of ω − N\ud scattering, based on fits within the framework of the Vector Meson Dominance model, is in the range of\ud 30–40 mb.

Published
2018

7. Semi-inclusive target and beam-target asymmetries from 6 GeV electron scattering with CLAS

Author

Jawalkar, S., Koirala, S., Avakian, H., Bosted, P., Griffioen, K.A., Keith, C., Kuhn, S.E., Adhikari, K.P., Adhikari, S., Adikaram, D., Akbar, Z., Amaryan, M.J., Anefalos Pereira, S., Ball, J., Baltzell, N.A., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A.S., Boiarinov, S., Briscoe, W.J., Brock, J., Brooks, W.K., Bültmann, S., Burkert, V.D., Cao, Frank Thanh, Carlin, C., Carman, D.S., Celentano, A., Charles, G., Chetry, T., Ciullo, G., Clark, L., Colaneri, L., Cole, P.L., Contalbrigo, M., Cortes, O., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Defurne, M., Deur, A., Djalali, C., Ddoge, G., Dupre, R., Egiyan, H., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fedotov, G., Fegan, S., Fersch, R., Filippi, A., Fleming, J.A., Forest, T.A., Fradi, A., Garçon, M., Ghandilyan, Y., Gilfoyle, G.P., Giovanetti, K.L., Girod, F.X., Gleason, C., Gohn, W., Golovatch, E., Gothe, R.W., Guidal, M., Guler, N., Guo, L., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Heddle, D., Hicks, K., Hollis, G., Holtrop, M., Hughes, S.M., Ilieva, Y., Ireland, D.G., Ishkhanov, B.S., Isupov, E.L., Jenkins, D., Jiang, H., Joo, K., Joosten, S., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Kim, A., Kim, W., Klein, A., Klein, F.J., Kubarovsky, V., Kuleshov, S.V., Lanza, L., Lenisa, P., Livingston, K., Lu, H.Y., MacGregor, I.J.D., Markov, N., Mayer, M., McCracken, M.E., McKinnon, B., Meyer, C.A., Mineeva, T., Mirazita, M., Mokeev, V., Montgomery, R.A., Movsisyan, A., Munoz Camacho, C., Nadel-Turonski, P., Net, L.A., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A.I., Paremuzyan, R., Park, K., Pasyuk, E., Phelps, E., Phelps, W., Pierce, J., Pisano, S., Pogorelko, O., Price, J.W., Prok, Y., Protopopescu, D., Raue, B.A., Ripani, M., Riser, D., Rizzo, A., Rosner, G., Rossi, P., Sabatié, F., Salgado, C., Schumacher, R.A., Seder, E., Sharabian, Y.G., Simonyan, A., Skorodumina, Iu., Smith, G.D., Sober, D.I., Sokhan, D., Sparveris, N., Stankovic, I., Strauch, S., Taiuti, M., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N.K., Watts, D.P., Wei, X., Weinstein, L.B., Wood, M.H., Zachariou, N., Zhang, J., and Zhao, Z.W.

Abstract

We present precision measurements of the target and beam-target spin asymmetries from neutral pion electroproduction in deep-inelastic scattering (DIS) using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. We scattered 6-GeV, longitudinally polarized electrons off longitudinally polarized protons in a cryogenic $^{14}$NH$_{3}$ target, and extracted double and single target spin asymmetries for ep→e′π0X in multidimensional bins in four-momentum transfer (1.0

Published
2018

8. Photon beam asymmetry Σ in the reaction γ→p→pω for E γ = 1.152 to 1.876 GeV

Author

Collins, P., Ritchie, B.G., Dugger, M., Klein, F.J., Anisovich, A.V., Klempt, E., Nikonov, V.A., Sarantsev, A., Adhikari, K.P., Adhikari, S., Adikaram, D., Akbar, Z., Anefalos Pereira, S., Avakian, H., Ball, J., Baltzell, N.A., Bashkanov, M., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A.S., Boiarinov, S., Briscoe, W.J., Brooks, W.K., Burkert, V.D., Cao, Frank Thanh, Cao, T., Carman, D.S., Celentano, A., Charles, G., Chetry, T., Ciullo, G., Clark, L., Cole, P.L., Contalbrigo, M., Cortes, O., Crede, V., Dashyan, N., De Vita, R., De Sanctis, E., Defurne, M., Deur, A., Djalali, C., Dupre, R., Egiyan, H., El Alaoui, A., El Fassi, L., Eugenio, P., Fedotov, G., Filippi, A., Fleming, J.A., Ghandilyan, Y., Gilfoyle, G.P., Giovanetti, K.L., Girod, F.X., Glazier, D.I., Gleason, C., Golovatch, E., Gothe, R.W., Griffioen, K.A., Guidal, M., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Heddle, D., Hicks, K., Hollis, G., Holtrop, M., Hughes, S.M., Ilieva, Y., Ireland, D.G., Ishkhanov, B.S., Isupov, E.L., Jenkins, D., Jiang, H., Jo, H.S., Joosten, S., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Kim, A., Kim, W., Klein, A., Kubarovsky, V., Kuleshov, S.V., Lanza, L., Lenisa, P., Livingston, K., MacGregor, I.J.D., Markov, N., McKinnon, B., Meyer, C.A., Meziani, Z.E., Mineeva, T., Mokeev, V., Montgomery, R.A., Movsisyan, A., Munevar, E., Munoz Camacho, C., Nadel-Turonski, P., Net, L.A., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A.I., Paolone, M., Paremuzyan, R., Park, K., Pasyuk, E., Phelps, W., Pisano, S., Pogorelko, O., Price, J.W., Procureur, S., Prok, Y., Protopopescu, D., Raue, B.A., Ripani, M., Rizzo, A., Rosner, G., Sabatié, F., Salgado, C., Schumacher, R.A., Sharabian, Y.G., Simonyan, A., Skorodumina, Iu., Smith, G.D., Sober, D.I., Sokhan, D., Sparveris, N., Stankovic, I., Stepanyan, S., Strakovsky, I.I., Strauch, S., Taiuti, M., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N.K., Watts, D.P., Wei, X., Wood, M.H., Zachariou, N., Zhang, J., and Zhao, Z.W.

Subjects
Nuclear Experiment
Abstract

Photon beam asymmetry Σ measurements for ω photoproduction in the reaction γ→p→ωp are reported for photon energies from 1.152 to 1.876 GeV. Data were taken using a linearly-polarized tagged photon beam, a cryogenic hydrogen target, and the CLAS spectrometer in Hall B at Jefferson Lab. The measurements obtained markedly increase the size of the database for this observable, extend coverage to higher energies, and resolve discrepancies in previously published data. Comparisons of these new results with predictions from a chiral-quark-based model and from a dynamical coupled-channels model indicate the importance of interferences between t -channel meson exchange and s - and u -channel contributions, underscoring sensitivity to the nucleon resonances included in those descriptions. Comparisons with the Bonn–Gatchina partial-wave analysis indicate the Σ data reported here help to fix the magnitudes of the interference terms between the leading amplitudes in that calculation (Pomeron exchange and the resonant portion of the JP=3/2+ partial wave), as well as the resonant portions of the smaller partial waves with JP=1/2− , 3/2− , and 5/2+ .

Published
2017

Catalog

Books, media, physical & digital resources
See catalog results