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697 results on '"Reitz, B."'

1. $K^+\Lambda(1520)$ photoproduction at forward angles near threshold with the BGOOD experiment

Author

Rosanowski, E. O., Jude, T. C., Alef, S., Figueiredo, A. J. Clara, Burdeinyi, D. D, Cole, P. L., Di Salvo, R., Elsner, D., Fantini, A., Freyermuth, O., Frommberger, F., Ganenko, V. B, Ghio, F., Groß, J., Kohl, K., Sandri, P. Levi, Mandaglio, G., Messi, R., Moricciani, D., Pedroni, P., Reitz, B. -E., Romaniuk, M., Scheluchin, G., Schmieden, H., and Sonnenschein, A.

Subjects
Nuclear Experiment
Abstract

The differential cross section for $\gamma p\rightarrow K^+\Lambda(1520)$ was measured from threshold to a centre-of-mass energy of 2090\,MeV at forward angles at the BGOOD experiment. The high statistical precision and resolution in centre-of-mass energy and angle allows a detailed characterisation of this low-momentum transfer kinematic region. The data agree with a previous LEPS measurement and support effective Lagrangian models that indicate that the contact term dominates the cross section near threshold., Comment: 6 pages, 7 figures

Published
2024

2. Coherent $\pi^0\eta d$ photoproduction at forward deuteron angles measured at BGOOD

Author

Figueiredo, A. J. Clara, Jude, T. C., Alef, S., Cole, P. L., Di Salvo, R., Elsner, D., Fantini, A., Freyermuth, O., Frommberger, F., Ghio, F., Groß, J., Kohl, K., Sandri, P. Levi, Mandaglio, G., Pedroni, P., Reitz, B. -E., Romaniuk, M., Scheluchin, G., Schmieden, H., Sonnenschein, A., and Tillmanns, C.

Subjects
Nuclear Experiment
Abstract

The coherent reaction, $\gamma d \rightarrow \pi^0\eta d$ was studied with the BGOOD experiment at ELSA from threshold to a centre-of-mass energy of 3200\,MeV. A full kinematic reconstruction was made, with final state deuterons identified in the forward spectrometer and $\pi^0$ and $\eta$ decays in the central BGO Rugby Ball. The strength of the differential cross section exceeds what can be described by models of coherent photoproduction at forward angles by orders of magnitude. The distribution of the differential cross section has an excellent agreement with a model including quasi-free $\Delta \pi$ photoproduction, pion re-scattering and $N(1535)$ formation and subsequent nucleon coalescence to the deuteron. This also gives a reasonable description of the two-body invariant mass distributions and naturally explains the similar magnitudes of this channel and $\pi^0\pi^0 d$ coherent photoproduction., Comment: 7 pages, 5 figures

Published
2024

3. Data Mining-Enabled Temperature Control for Sustainable Production in Rubber Extrusion Lines: An Artificial Neural Network-Based Approach

Author

Lukas, M., Leineweber, S., Reitz, B., Overmeyer, L., Aschemann, A., Klie, B., Giese, U., Behrens, Bernd-Arno, Series Editor, Grzesik, Wit, Series Editor, Ihlenfeldt, Steffen, Series Editor, Kara, Sami, Series Editor, Ong, Soh-Khim, Series Editor, Tomiyama, Tetsuo, Series Editor, Williams, David, Series Editor, Bauernhansl, Thomas, editor, Verl, Alexander, editor, Liewald, Mathias, editor, and Möhring, Hans-Christian, editor

Published
2024
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4. Evidence of a dibaryon spectrum in coherent $\pi^0\pi^0 d$ photoproduction at forward deuteron angles

Author

Jude, T. C., Alef, S., Beck, R., Braghieri, A., Cole, P. L., Elsner, D., Di Salvo, R., Fantini, A., Freyermuth, O., Frommberger, F., Ghio, F., Gridnev, A., Kohl, K., Kozlenko, N., Lapik, A., Sandri, P. Levi, Lisin, V., Mandaglio, G., Moricciani, D., Nedorezov, V., Novinsky, D., Pedroni, P., Polonskiy, A., Reitz, B. -E., Romaniuk, M., Scheluchin, G., Schmieden, H., Stuglev, A., Sumachev, V., and Tarakanov, V.

Subjects
Nuclear Experiment
Abstract

The coherent reaction, $\gamma d \rightarrow \pi^0\pi^0 d$ was studied with the BGOOD experiment at ELSA from threshold to a centre-of-mass energy of 2850\,MeV. A full kinematic reconstruction was made, with final state deuterons identified in the forward spectrometer and $\pi^0$ decays in the central BGO Rugby Ball. The strength of the differential cross section exceeds what can be described by models of coherent photoproduction and instead supports the three isoscalar dibaryon candidates reported by the ELPH collaboration at 2.38, 2.47 and 2.63\,GeV/c$^2$. A low mass enhancement in the $\pi^0\pi^0$ invariant mass is also observed at the $d^*(2380)$ centre-of-mass energy which is consistent with the ABC effect. At higher centre-of-mass energies, a narrow peak in the $\pi^0 d$ invariant mass at 2114\,MeV/c$^2$ with a width of 20\,MeV/c$^2$ supports a sequential two-dibaryon decay mechanism., Comment: 8 pages, 10 figures. Additional references (recommended by colleagues) added since the first revision

Published
2022
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5. Measurement of the $\gamma n\rightarrow K^0\Sigma^0$ differential cross section over the $K^*$ threshold

Author

Kohl, K., Jude, T. C., Alef, S., Beck, R., Braghieri, A., Cole, P., Salvo, R. D., Fantini, A., Freyermuth, O., Frommberger, F., Ghio, F., Gridnev, A., Hammann, D., Hannappel, J., Kozlenko, N., Lapik, A., Sandri, P. Levi, Lisin, V., Mandaglio, G., Messi, R., Moricciani, D., Nedorezov, V., Nikonov, V. A., Novinsky, D., Pedroni, P., Polonski, A., Reitz, B. -E., Romaniuk, M., Scheluchin, G., Schmieden, H., Stuglev, A., Sumachev, V., and Tarakanov, V.

Subjects
Nuclear Experiment
Abstract

The differential cross section for the quasi-free photoproduction reaction $\gamma n\rightarrow K^0\Sigma^0$ was measured at BGOOD at ELSA from threshold to a centre-of-mass energy of 2400 MeV. Close to threshold the results are consistent with existing data and are in agreement with partial wave analysis solutions over the full measured energy range, with a large coupling to the $\Delta$(1900)1/2- evident. This is the first dataset covering the K* threshold region, where there are model predictions of dynamically generated vector meson-baryon resonance contributions., Comment: 6 pages, 8 figures

Published
2021

6. Photoproduction of $K^+\Lambda(1405) \rightarrow K^+\pi^0\Sigma^0$ extending to forward angles and low momentum transfer

Author

Scheluchin, G., Jude, T. C., Alef, S., Bauer, P., Bayadilov, D., Beck, R., Braghieri, A., Cole, P. L., Di Salvo, R., Elsner, D., Fantini, A., Freyermuth, O., Fromberger, F., Ghio, F., Gridnev, A., Hammann, D., Hannappel, J., Kohl, K., Kozlenko, N., Lapik, A., Sandri, P. Levi, Lisin, V., Mandaglio, G., Messi, R., Moricciani, D., Mushkarenkov, A., Nedorezov, V., Novinsky, D., Pedroni, P., Polonski, A., Reitz, B. -E., Romaniuk, M., Schmieden, H., Sumachev, V., and Tarakanov, V.

Subjects
Nuclear Experiment
Abstract

$K^+\Lambda(1405)$ photoproduction has been studied at the BGOOD experiment via the all neutral decay, $\Lambda(1405)\rightarrow\Sigma^0\pi^0$. The unique BGOOD experimental setup allows both the cross section and $\Lambda(1405)$ invariant mass distribution (line shape) to be measured over a broad $K^+$ polar angle range, extending to extreme forward $K^+$ angles unattainable at previous experiments. Evidence is provided for the role of a triangle singularity driven by the $N^*(2030)$ resonance, which appears to contribute significantly to $K^+\Lambda(1405)$ photoproduction. This is observed in both the angular distributions and the integrated cross section which was determined with unprecedented energy resolution. The measured line shape is also in agreement with the previous results of CLAS and ANKE, and is consistent with two poles derived in $\chi$PT based models.

Published
2021
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7. Measurement of the generalized spin polarizabilities of the neutron in the low $Q^2$ region

Author

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

Subjects
Nuclear Experiment
Abstract

Understanding the nucleon spin structure in the regime where the strong interaction becomes truly strong poses a challenge to both experiment and theory. At energy scales below the nucleon mass of about 1 GeV, the intense interaction among the quarks and gluons inside the nucleon makes them highly correlated. Their coherent behaviour causes the emergence of effective degrees of freedom, requiring the application of non-perturbative techniques, such as chiral effective field theory. Here, we present measurements of the neutron's generalized spin-polarizabilities that quantify the neutron's spin precession under electromagnetic fields at very low energy-momentum transfer squared down to 0.035 GeV$^2$. In this regime, chiral effective field theory calculations are expected to be applicable. Our data, however, show a strong discrepancy with these predictions, presenting a challenge to the current description of the neutron's spin properties., Comment: V1: initial version submitted to Nature Physics. V2: Published version. 16 pages, 7 figures. Additional material: 4 data tables (18 pages) V3: Typo corrected in author list. Paper content unchanged

Published
2021
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8. Strangeness Photoproduction at the BGO-OD experiment

Author

Jude, T. C., Alef, S., Bauer, P., Beck, R., Braghieri, A., Cole, P. L., Di Salvo, R., Elsner, D., Fantini, A., Freyermuth, O., Ghio, F., Gridnev, A., Hammann, D., Hannappel, J., Kohl, K., Kozlenko, N., Lapik, A., Sandri, P. Levi, Lisin, V., Mandaglio, G., Messi, R., Moricciani, D., Nedorezov, V., Novinsky, D., Pedroni, P., Polonski, A., Reitz, B. -E., Romaniuk, M., Scheluchin, G., Schmieden, H., Sumachev, V., Tarakanov, V., and Tillmanns, C.

Subjects
Nuclear Experiment
Abstract

The BGO-OD experiment at the ELSA accelerator facility uses an energy tagged bremsstrahlung photon beam to investigate the excitation structure of the nucleon. The setup consists of a highly segmented BGO calorimeter surrounding the target, with a particle tracking magnetic spectrometer at forward angles. BGO-OD is ideal for investigating low momentum transfer processes due to the acceptance and high momentum resolution at forward angles. In particular, this enables the investigation of strangeness photoproduction where t-channel exchange mechanisms play an important role. This also allows access to low momentum exchange kinematics where extended, molecular structure may manifest in reaction mechanisms. First key results at low $t$ indicate a cusp-like structure in $K^+\Sigma^0$ photoproduction at $W = 1900$\,MeV, line shapes and differential cross sections for $K^+\Lambda$(1405)$\rightarrow K^+\Sigma^0\pi^0$, and a peak structure in $K^0_S\Sigma^0$ photoproduction. The peak in the $K^0_S\Sigma^0$ channel appears consistent with meson-baryon generated states, where equivalent models have been used to describe the $P_C$ pentaquark candidates in the heavy charmed quark sector., Comment: Proceedings of The 12th International Workshop on the Physics of Excited Nucleons (NSTAR 2019)

Published
2020

9. Observation of a cusp-like structure in the $\gamma p \rightarrow K^+\Sigma^0$ cross section at forward angles and low momentum transfer

Author

Jude, T. C., Alef, S., Bauer, P., Bayadilov, D., Beck, R., Bella, A., Bieling, J., Braghieri, A., Cole, P. L., Elsner, D., Di Salvo, R., Fantini, A., Freyermuth, O., Frommberger, F., Ghio, F., Goertz, S., Gridnev, A., Hammann, D., Hannappel, J., Kohl, K., Kozlenko, N., Sandri, A. Lapik P. Levi, Lisin, V., Mandaglio, G., Messi, F., Messi, R., Moricciani, D., Nedorezov, V., Nikonov, V. A, Novinskiy, D., Pedroni, P., Polonskiy, A., Reitz, B. -E., Romaniuk, M., Sarantsev, A. V, Scheluchin, G., Schmieden, H., Stugelev, A., Sumachev, V., Vegna, V., Tarakanov, V., and Zimmermann, T.

Subjects
Nuclear Experiment
Abstract

The $\gamma p \rightarrow K^+\Sigma^0$ differential cross section at extremely forward angles was measured at the BGOOD experiment. A three-quarter drop in strength over a narrow range in energy and a strong dependence on the polar angle of the $K^+$ in the centre-of-mass of the reaction is observed at a centre-of-mass energy of 1900\,MeV. Residing close to multiple open and hidden strangeness thresholds, the structure appears consistent with meson-baryon threshold effects which may contribute to the reaction mechanism., Comment: 9 pages (including a 2 page appendix of tabulated data), 10 figures

Published
2020
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10. $K^+\Lambda$ photoproduction at forward angles and low momentum transfer

Author

Alef, S., Bauer, P., Bayadilov, D., Beck, R., Bella, A., Bieling, J., Braghieri, A., Cole, P. L., Elsner, D., Di Salvo, R., Fantini, A., Freyermuth, O., Frommberger, F., Ghio, F., Goertz, S., Gridnev, A., Hammann, D., Hannappel, J., Jude, T. C., Kohl, K., Kozlenko, N., Sandri, A. Lapik P. Levi, Lisin, V., Mandaglio, G., Messi, F., Messi, R., Moricciani, D., Nedorezov, V., Nikonov, V. A, Novinskiy, D., Pedroni, P., Polonskiy, A., Reitz, B. -E., Romaniuk, M., Sarantsev, A. V, Scheluchin, G., Schmieden, H., Stuglev, A., Sumachev, V., Vegna, V., Tarakanov, V., and Zimmermann, T.

Subjects
Nuclear Experiment
Abstract

$\gamma p \rightarrow K^+ \Lambda$ differential cross sections and recoil polarisation data from threshold for extremely forward angles are presented. The measurements were performed at the BGOOD experiment at ELSA, utilising the high angular and momentum resolution forward spectrometer for charged particle identification. The data discriminates between conflicting results in the world data set and enable extraction of the cross section as the minimum momentum transfer to the recoiling hyperon is approached., Comment: 12 pages (including a 2 page appendix), 14 figures

Published
2020
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11. Measurement of the γn→K0Σ0K∗ differential cross section over the γn→K0Σ0K∗ threshold

Author

Kohl, K., Jude, T. C., Alef, S., Beck, R., Braghieri, A., Cole, P. L., Elsner, D., Di Salvo, R., Fantini, A., Freyermuth, O., Frommberger, F., Ghio, F., Gridnev, A., Hammann, D., Hannappel, J., Kozlenko, N., Lapik, A., Sandri, P. Levi, Lisin, V., Mandaglio, G., Messi, R., Moricciani, D., Nedorezov, V., Nikonov, V. A., Novinskiy, D., Pedroni, P., Polonskiy, A., Reitz, B.-E., Romaniuk, M., Scheluchin, G., Schmieden, H., Stuglev, A., Sumachev, V., and Tarakanov, V.

Published
2023
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12. The BGOOD experimental setup at ELSA

Author

Alef, S., Bauer, P., Bayadilov, D., Beck, R., Becker, M., Bella, A., Bieling, J., Boese, S., Braghieri, A., Brinkmann, K. -Th., Cole, P., Di Salvo, R., Elsner, D., Fantini, A., Freyermuth, O., Frommberger, F., Gervino, G., Ghio, F., Goertz, S., Gridnev, A., Gutz, E., Hammann, D., Hannappel, J., Hillert, W., Jahn, O., Jahn, R., Johnstone, J. R., Joosten, R., Jude, T. C., Kleber, V., Klein, F., Kohl, K., Koop, K., Kozlenko, N., Krusche, B., Lapik, A., Sandri, P. Levi, Lisin, V., Lopatin, I., Mandaglio, G., Manganaro, M., Messi, F., Messi, R., Moricciani, D., Mushkarenkov, A., Nedorezov, V., Novinskiy, D., Pedroni, P., Polonskiy, A., Reitz, B. -E., Romaniuk, M., Rostomyan, T., Scheluchin, G., Schmieden, H., Stugelev, A., Sumachev, V., Tarakanov, V., Vegna, V., Walther, D., Zaunick, H. -G., and Zimmermann, T.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

The BGOOD experiment at the ELSA facility in Bonn has been commissioned within the framework of an international collaboration. The experiment pursues a systematic investigation of non-strange and strange meson photoproduction, in particular $t$-channel processes at low momentum transfer. The setup uniquely combines a central almost $4\pi$ acceptance BGO crystal calorimeter with a large aperture forward magnetic spectrometer providing excellent detection of both neutral and charged particles, complementary to other setups such as Crystal Barrel, Crystal Ball, LEPS and CLAS., Comment: 26 pages, 37 figures

Published
2019
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13. Measurement of the 3He Spin-Structure Functions and of Neutron (3He) Spin-Dependent Sum Rules at 0.035<Q^2<0.24 GeV^2

Author

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

Subjects
Nuclear Experiment, High Energy Physics - Experiment
Abstract

The spin-structure functions $g_1$ and $g_2$, and the spin-dependent partial cross-section $\sigma_\mathrm{TT}$ have been extracted from the polarized cross-sections differences, $\Delta \sigma_{\parallel}\hspace{-0.06cm}\left(\nu,Q^{2}\right)$ and $\Delta \sigma_{\perp}\hspace{-0.06cm}\left(\nu,Q^{2}\right)$ measured for the $\vec{^\textrm{3}\textrm{He}}(\vec{\textrm{e}},\textrm{e}')\textrm{X}$ reaction, in the E97-110 experiment at Jefferson Lab. Polarized electrons with energies from 1.147 to 4.404 GeV were scattered at angles of 6$^{\circ}$ and 9$^{\circ}$ from a longitudinally or transversely polarized $^{3}$He target. The data cover the kinematic regions of the quasi-elastic, resonance production and beyond. From the extracted spin-structure functions, the first moments $\overline{\Gamma_1}\hspace{-0.06cm}\left(Q^{2}\right)$, $\Gamma_2\hspace{-0.06cm}\left(Q^{2}\right)$ and $I_{\mathrm{TT}}\hspace{-0.06cm}\left(Q^{2}\right)$ are evaluated with high precision for the neutron in the $Q^2$ range from 0.035 to 0.24~GeV$^{2}$. The comparison of the data and the chiral effective field theory predictions reveals the importance of proper treatment of the $\Delta$ degree of freedom for spin observables., Comment: 7 pages, 5 figures, 3 tables. Version published in Phys. Lett. B

Published
2019
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14. High-resolution hypernuclear spectroscopy at Jefferson Lab, Hall A

Author

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

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The experiment E94-107 in Hall A at Jefferson Lab started a systematic study of high resolution hypernuclear spectroscopy in the 0p-shell region of nuclei such as the hypernuclei produced in electroproduction on 9Be, 12C and 16O targets. In order to increase counting rates and provide unambiguous kaon identification two superconducting septum magnets and a ring-imaging Cherenkov detector were added to the Hall A standard equipment. The high-quality beam, the good spectrometers and the new experimental devices allowed us to obtain very good results. For the first time, measurable strength with sub-MeV energy resolution was observed for the core-excited states of Lambda 12B. A high-quality Lambda 16N hypernuclear spectrum was likewise obtained. A first measurement of the Lambda binding energy for Lambda 16N, calibrated against the elementary reaction on hydrogen, was obtained with high precision, 13.76 +/- 0.16 MeV. Similarly, the first Lambda 9Li hypernuclear spectrum shows general agreement with theory (distorted-wave impulse approximation with the SLA and BS3 electroproduction models and shell-model wave functions). Some disagreement exists with respect to the relative strength of the states making up the first multiplet. A Lambda separation energy of 8.36 MeV was obtained, in agreement with previous results. It has been shown that the electroproduction of hypernuclei can provide information complementary to that obtained with hadronic probes and the gamma-ray spectroscopy technique., Comment: 27 pages, 18 figures, submitted to Physical Review C

Published
2018
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15. Strangeness Photoproduction at the BGO-OD Experiment

Author

Jude, T. C., Alef, S., Bayadilov, D., Beck, R., Becker, M., Bella, A., Bielefeldt, P., Boese, S., Braghieri, A., Brinkmann, K., Cole, P., Curciarello, F., De Leo, V., Di Salvo, R., Dutz, H., Elsner, D., Fantini, A., Freyermuth, O., Friedrich, S., Frommberger, F., Ganenko, V., Gervino, G., Ghio, F., Giardina, G., Goertz, S., Gridnev, A., Gutz, E., Hammann, D., Hannappel, J., Hartmann, P., Hillert, W., Ignatov, A., Jahn, R., Joosten, R., Klein, F., Koop, K., Krusche, B., Lapik, A., Sandri, P. Levi, Lopatin, I. V., Mandaglio, G., Messi, F., Messi, R., Metag, V., Moricciani, D., Mushkarenkov, A., Nanova, M., Nedorezov, V., Novinskiy, D., Pedroni, P., Reitz, B., Romaniuk, M., Rostomyan, T., Rudnev, N., Scheluchin, G., Schmieden, H., Stugelev, A., Sumachev, V., Tarakanov, V., Vegna, V., Walther, D., Watts, D., Zaunick, H., and Zimmermann, T.

Subjects
Nuclear Experiment
Abstract

BGO-OD is a newly commissioned experiment to investigate the internal structure of the nucleon, using an energy tagged bremsstrahlung photon beam at the ELSA electron facility. The setup consists of a highly segmented BGO calorimeter surrounding the target, with a particle tracking magnetic spectrometer at forward angles. BGO-OD is ideal for investigating meson photoproduction. The extensive physics programme for open strangeness photoproduction is introduced, and preliminary analysis presented., Comment: 6 pages, 4 figures. Proceedings for the 10th International Workshop on the Physics of Excited Nucleons (NSTAR2015)

Published
2015

16. The E00-110 experiment in Jefferson Lab's Hall A: Deeply Virtual Compton Scattering off the Proton at 6 GeV

Author

Defurne, M., Amaryan, M., Aniol, K. A., Beaumel, M., Benaoum, H., Bertin, P., Brossard, M., Camsonne, A., Chen, J. -P., Chudakov, E., Craver, B., Cusanno, F., de Jager, C. W., Deur, A., Feuerbach, R., Ferdi, C., Fieschi, J. -M., Frullani, S., Fuchey, E., Garcon, M., Garibaldi, F., Gayou, O., Gavalian, G., Gilman, R., Gomez, J., Gueye, P., Guichon, P. A. M., Guillon, B., Hansen, O., Hayes, D., Higinbotham, D., Holmstrom, T., Hyde, C. E., Ibrahim, H., Igarashi, R., Jiang, X., Jo, H. S., Kaufman, L. J., Kelleher, A., Keppel, C., Kolarkar, A., Kuchina, E., Kumbartzki, G., Laveissière, G., LeRose, J. J., Lindgren, R., Liyanage, N., Lu, H. -J., Margaziotis, D. J., Mazouz, M., Meziani, Z. -E., McCormick, K., Michaels, R., Michel, B., Moffit, B., Monaghan, P., Camacho, C. Muñoz, Nanda, S., Nelyubin, V., Paremuzyan, R., Potokar, M., Qiang, Y., Ransome, R. D., Réal, J. -S., Reitz, B., Roblin, Y., Roche, J., Sabatié, F., Saha, A., Sirca, S., Slifer, K., Solvignon, P., Subedi, R., Sulkosky, V., Ulmer, P. E., Voutier, E., Wang, K., Weinstein, L. B., Wojtsekhowski, B., Zheng, X., and Zhu, L.

Subjects
Nuclear Experiment, High Energy Physics - Experiment
Abstract

We present final results on the photon electroproduction ($\vec{e}p\rightarrow ep\gamma$) cross section in the deeply virtual Compton scattering (DVCS) regime and the valence quark region from Jefferson Lab experiment E00-110. Results from an analysis of a subset of these data were published before, but the analysis has been improved which is described here at length, together with details on the experimental setup. Furthermore, additional data have been analyzed resulting in photon electroproduction cross sections at new kinematic settings, for a total of 588 experimental bins. Results of the $Q^2$- and $x_B$-dependences of both the helicity-dependent and helicity-independent cross sections are discussed. The $Q^2$-dependence illustrates the dominance of the twist-2 handbag amplitude in the kinematics of the experiment, as previously noted. Thanks to the excellent accuracy of this high luminosity experiment, it becomes clear that the unpolarized cross section shows a significant deviation from the Bethe-Heitler process in our kinematics, compatible with a large contribution from the leading twist-2 DVCS$^2$ term to the photon electroproduction cross section. The necessity to include higher-twist corrections in order to fully reproduce the shape of the data is also discussed. The DVCS cross sections in this paper represent the final set of experimental results from E00-110, superseding the previous publication., Comment: 48 pages, 32 figures

Published
2015
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17. Spectroscopy of Lambda-9Li by electroproduction

Author

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

Subjects
Nuclear Experiment
Abstract

In the absence of accurate data on the free two-body hyperon-nucleon interaction, the spectra of hypernuclei can provide information on the details of the effective hyperon-nucleon interaction. Electroproduction of the hypernucleus Lambda-9Li has been studied for the first time with sub-MeV energy resolution in Hall A at Jefferson Lab on a 9Be target. In order to increase the counting rate and to provide unambiguous kaon identification, two superconducting septum magnets and a Ring Imaging CHerenkov detector (RICH) were added to the Hall A standard equipment. The cross section to low-lying states of Lambda-9Li is concentrated within 3 MeV of the ground state and can be fitted with four peaks. The positions of the doublets agree with theory while a disagreement could exist with respect to the relative strengths of the peaks in the doublets. A Lambda separation energy of 8.36 +- 0.08 (stat.) +- 0.08 (syst.) MeV was measured, in agreement with an earlier experiment., Comment: 14 pages, 8 figures

Published
2014
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18. Moments of the neutron $g_2$ structure function at intermediate $Q^2$

Author

Solvignon, P., Liyanage, N., Chen, J. -P., Choi, Seonho, Slifer, K., Aniol, K., Averett, T., Boeglin, W., Camsonne, A., Cates, G. D., Chang, C. C., Chudakov, E., Craver, B., Cusanno, F., Deur, A., Dutta, D., Ent, R., Feuerbach, R., Frullani, S., Gao, H., Garibaldi, F., Gilman, R., Glashausser, C., Gorbenko, V., Hansen, O., Higinbotham, D. W., Ibrahim, H., Jiang, X., Jones, M., Kelleher, A., Kelly, J., Keppel, C., Kim, W., Korsch, W., Kramer, K., Kumbartzki, G., LeRose, J. J., Lindgren, R., Ma, B., Margazioti, D. J., Markowitz, P., McCormick, K., Meziani, Z. -E., Michaels, R., Moffit, B., Monaghan, P., Camacho, C. Munoz, Paschke, K., Reitz, B., Saha, A., Shneor, R., Singh, J., Sulkosky, V., Tobias, A., Urciuoli, G. M., Wang, K., Wijesooriya, K., Wojtsekhowski, B., Woo, S., Yang, J. -C., Zheng, X., and Zhu, L.

Subjects
Nuclear Experiment
Abstract

We present new experimental results of the $^3$He spin structure function $g_2$ in the resonance region at $Q^2$ values between 1.2 and 3.0 (GeV/c)$^2$. Spin dependent moments of the neutron were then extracted. Our main result, the resonance contribution to the neutron $d_2$ matrix element, was found to be small at $$=2.4 (GeV/c)$^2$ and in agreement with the Lattice QCD calculation. The Burkhardt-Cottingham sum rule for $^3$He and the neutron was tested with the measured data and using the Wandzura-Wilczek relation for the low $x$ unmeasured region. A small deviation was observed at $Q^2$ values between 0.5 and 1.2 (GeV/c)$^2$ for the neutron.

Published
2013
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19. Measurement of the 12C(e,e'p)11B Two-Body Breakup Reaction at High Missing Momentum Values

Author

Monaghan, P., Shneor, R., Subedi, R., Anderson, B. D., Aniol, K., Annand, J., Arrington, J., Benaoum, H., Benmokhtar, F., Bertin, P., Bertozzi, W., Boeglin, W., Chen, J. P., Choi, Seonho, Chudakov, E., Atti, C. Ciofi degli, Cisbani, E., Cosyn, W., Craver, B., de Jager, C. W., Feuerbach, R. J., Folts, E., Frullani, S., Garibaldi, F., Gayou, O., Gilad, S., Gilman, R., Glamazdin, O., Gomez, J., Hansen, O., Higinbotham, D. W., Holmstrom, T., Ibrahim, H., Igarashi, R., Jans, E., Jiang, X., Jiang, Y., Kaufman, L., Kelleher, A., Kolarkar, A., Kuchina, E., Kumbartzki, G., LeRose, J. J., Lindgren, R., Liyanage, N., Margaziotis, D. J., Markowitz, P., Marrone, S., Mazouz, M., Meekins, D., Michaels, R., Moffit, B., Morita, H., Nanda, S., Perdrisat, C. F., Piasetzky, E., Potokar, M., Punjabi, V., Qiang, Y., Reinhold, J., Reitz, B., Ron, G., Rosner, G., Ryckebusch, J., Saha, A., Sawatzky, B., Segal, J., Shahinyan, A., Sirca, S., Slifer, K., Solvignon, P., Sulkosky, V., Thompson, N., Ulmer, P. E., Urciuoli, G. M., Voutier, E., Wang, K., Watson, J. W., Weinstein, L. B., Wojtsekhowski, B., Wood, S., Yao, H., Zheng, X., and Zhu, L.

Subjects
Nuclear Experiment
Abstract

The five-fold differential cross section for the 12C(e,e'p)11B reaction was determined over a missing momentum range of 200-400 MeV/c, in a kinematics regime with Bjorken x > 1 and Q2 = 2.0 (GeV/c)2. A comparison of the results and theoretical models and previous lower missing momentum data is shown. The theoretical calculations agree well with the data up to a missing momentum value of 325 MeV/c and then diverge for larger missing momenta. The extracted distorted momentum distribution is shown to be consistent with previous data and extends the range of available data up to 400 MeV/c., Comment: 12 pages, 1 table and 3 figures for submission to Journal Physics G

Published
2013
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20. New Measurements of the Transverse Beam Asymmetry for Elastic Electron Scattering from Selected Nuclei

Author

HAPPEX, The, Collaborations, PREX, Abrahamyan, S., Acha, A., Afanasev, A., Ahmed, Z., Albataineh, H., Aniol, K., Armstrong, D. S., Armstrong, W., Arrington, J., Averett, T., Babineau, B., Bailey, S. L., Barber, J., Barbieri, A., Beck, A., Bellini, V., Beminiwattha, R., Benaoum, H., Benesch, J., Benmokhtar, F., Bertin, P., Bielarski, T., Boeglin, W., Bosted, P., Butaru, F., Burtin, E., Cahoon, J., Camsonne, A., Canan, M., Carter, P., Chang, C. C., Cates, G. D., Chao, Y. C., Chen, C., Chen, J. P., Choi, Seonho, Chudakov, E., Cisbani, E., Craver, B., Cusanno, F., Dalton, M. M., De Leo, R., de Jager, K., Deconinck, W., Decowski, P., Deepa, D., Deng, X., Deur, A., Dutta, D., Etile, A., Ferdi, C., Feuerbach, R. J., Finn, J. M., Flay, D., Franklin, G. B., Friend, M., Frullani, S., Fuchey, E., Fuchs, S. A., Fuoti, K., Garibaldi, F., Gasser, E., Gilman, R., Giusa, A., Glamazdin, A., Glesener, L. E., Gomez, J., Gorchtein, M., Grames, J., Grimm, K., Gu, C., Hansen, O., Hansknecht, J., Hen, O., Higinbotham, D. W., Holmes, R. S., Holmstrom, T., Horowitz, C. J., Hoskins, J., Huang, J., Humensky, T. B., Hyde, C. E., Ibrahim, H., Itard, F., Jen, C. M., Jensen, E., Jiang, X., Jin, G., Johnston, S., Katich, J., Kaufman, L. J., Kelleher, A., Kliakhandler, K., King, P. M., Kolarkar, A., Kowalski, S., Kuchina, E., Kumar, K. S., Lagamba, L., Lambert, D., LaViolette, P., Leacock, J., Leckey IV, J., Lee, J. H., LeRose, J. J., Lhuillier, D., Lindgren, R., Liyanage, N., Lubinsky, N., Mammei, J., Mammoliti, F., Margaziotis, D. J., Markowitz, P., Mazouz, M., McCormick, K., McCreary, A., McNulty, D., Meekins, D. G., Mercado, L., Meziani, Z. E., Michaels, R. W., Mihovilovic, M., Moffit, B., Monaghan, P., Muangma, N., Munoz-Camacho, C., Nanda, S., Nelyubin, V., Neyret, D., Nuruzzaman, Oh, Y., Otis, K., Palmer, A., Parno, D., Paschke, K. D., Phillips, S. K., Poelker, M., Pomatsalyuk, R., Posik, M., Potokar, M., Prok, K., Puckett, A. J. R., Qian, X., Qiang, Y., Quinn, B., Rakhman, A., Reimer, P. E., Reitz, B., Riordan, S., Roche, J., Rogan, P., Ron, G., Russo, G., Saenboonruang, K., Saha, A., Sawatzky, B., Shahinyan, A., Silwal, R., Singh, J., Sirca, S., Slifer, K., Snyder, R., Solvignon, P., Souder, P. A., Sperduto, M. L., Subedi, R., Stutzman, M. L., Suleiman, R., Sulkosky, V., Sutera, C. M., Tobias, W. A., Troth, W., Urciuoli, G. M., Ulmer, P., Vacheret, A., Voutier, E., Waidyawansa, B., Wang, D., Wang, K., Wexler, J., Whitbeck, A., Wilson, R., Wojtsekhowski, B., Yan, X., Yao, H., Ye, Y., Ye, Z., Yim, V., Zana, L., Zhan, X., Zhang, J., Zhang, Y., Zheng, X., Ziskin, V., and Zhu, P.

Subjects
Nuclear Experiment
Abstract

We have measured the beam-normal single-spin asymmetry $A_n$ in the elastic scattering of 1-3 GeV transversely polarized electrons from $^1$H and for the first time from $^4$He, $^{12}$C, and $^{208}$Pb. For $^1$H, $^4$He and $^{12}$C, the measurements are in agreement with calculations that relate $A_n$ to the imaginary part of the two-photon exchange amplitude including inelastic intermediate states. Surprisingly, the $^{208}$Pb result is significantly smaller than the corresponding prediction using the same formalism. These results suggest that a systematic set of new $A_n$ measurements might emerge as a new and sensitive probe of the structure of heavy nuclei., Comment: 5 pages, 3 figures, accepted by PRL. v3: fixed one author name and affiliation, otherwise no change

Published
2012
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21. Measurements of the Electric Form Factor of the Neutron up to Q2=3.4 GeV2 using the Reaction He3(e,e'n)pp

Author

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

Subjects
Nuclear Experiment
Abstract

The electric form factor of the neutron was determined from studies of the reaction He3(e,e'n)pp in quasi-elastic kinematics in Hall A at Jefferson Lab. Longitudinally polarized electrons were scattered off a polarized target in which the nuclear polarization was oriented perpendicular to the momentum transfer. The scattered electrons were detected in a magnetic spectrometer in coincidence with neutrons that were registered in a large-solid-angle detector. More than doubling the Q2-range over which it is known, we find GEn = 0.0225 +/- 0.0017 (stat) +/- 0.0024 (syst), 0.0200 +/- 0.0023 +/- 0.0018, and 0.0142 +/- 0.0019 +/- 0.0013 for Q2 = 1.72, 2.48, and 3.41 GeV2, respectively., Comment: submitted to PRL

Published
2010
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22. 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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23. High Resolution Spectroscopy of 16N_Lambda by Electroproduction

Author

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

Subjects
Nuclear Experiment
Abstract

An experimental study of the 16O(e,e'K^+)16N_Lambda reaction has been performed at Jefferson Lab. A thin film of falling water was used as a target. This permitted a simultaneous measurement of the p(e,e'K^+)Lambda,Sigma_0 exclusive reactions and a precise calibration of the energy scale. A ground-state binding energy of 13.76 +/- 0.16 MeV was obtained for 16N_Lambda with better precision than previous measurements on the mirror hypernucleus 16O_Lambda. Precise energies have been determined for peaks arising from a Lambda in s and p orbits coupled to the p_{1/2} and p_{3/2} hole states of the 15N core nucleus., Comment: 5 pages, 3 figures, 2 tables

Published
2008
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24. Quark-Hadron Duality in Neutron (3He) Spin Structure

Author

Solvignon, P., Liyanage, N., Chen, J. -P., Choi, Seonho, Aniol, K., Averett, T., Boeglin, W., Camsonne, A., Cates, G. D., Chang, G., Chudakov, E., Craver, B., Cusanno, F., Deur, A., Dutta, D., Ent, R., Feuerbach, R., Frullani, S., Gao, H., Garibaldi, F., Gilman, R., Glashausser, C., Gorbenko, V., Hansen, O., Higinbotham, D. W., Ibrahim, H., Jiang, X., Jones, M., Kelleher, A., Kelly, J., Keppel, C., Kim, W., Korsch, W., Kramer, K., Kumbartzki, G., LeRose, J. J., Lindgren, R., Ma, B., Margaziotis, D. J., Markowitz, P., McCormick, K., Meziani, Z. -E., Michaels, R., Moffit, B., Monaghan, P., Camacho, C. Munoz, Paschke, K., Reitz, B., Saha, A., Sheyor, R., Singh, J., Slifer, K., Sulkosky, V., Tobias, A., Urciuoli, G. M., Wang, K., Wijesooriya, K., Wojtsekhowski, B., Woo, S., Yang, J. -C., Zheng, X., and Zhu, L.

Subjects
Nuclear Experiment
Abstract

We present experimental results of the first high-precision test of quark-hadron duality in the spin-structure function g_1 of the neutron and $^3$He using a polarized 3He target in the four-momentum-transfer-squared range from 0.7 to 4.0 (GeV/c)^2. Global duality is observed for the spin-structure function g_1 down to at least Q^2 = 1.8 (GeV/c)^2 in both targets. We have also formed the photon-nucleon asymmetry A_1 in the resonance region for 3He and found no strong Q^2-dependence above 2.2 (GeV/c)^2., Comment: 13 pages, 3 figures

Published
2008
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25. High Resolution Spectroscopy of 12B_Lambda by Electroproduction

Author

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

Subjects
Nuclear Experiment
Abstract

An experiment measuring electroproduction of hypernuclei has been performed in Hall A at Jefferson Lab on a $^{12}$C target. In order to increase counting rates and provide unambiguous kaon identification two superconducting septum magnets and a Ring Imaging CHerenkov detector (RICH) were added to the Hall A standard equipment. An unprecedented energy resolution of less than 700 keV FWHM has been achieved. Thus, the observed \lam{12}{B} spectrum shows for the first time identifiable strength in the core-excited region between the ground-state {\it s}-wave $\Lambda$ peak and the 11 MeV {\it p}-wave $\Lambda$ peak., Comment: Paper submitted to Physical Review Letters

Published
2007
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26. Angular dependence of recoil proton polarization in high-energy \gamma d \to p n

Author

Jiang, X., Arrington, J., Benmokhtar, F., Camsonne, A., Chen, J. P., Choi, S., Chudakov, E., Cusanno, F., Deur, A., Dutta, D., Garibaldi, F., Gaskell, D., Gayou, O., Gilman, R., Glashauser, C., Hamilton, D., Hansen, O., Higinbotham, D. W., Holt, R. J., de Jager, C. W., Jones, M. K., Kaufman, L. J., Kinney, E. R., Kramer, K., Lagamba, L., de Leo, R., Lerose, J., Lhuillier, D., Lindgren, R., Liyanage, N., McCormick, K., Meziani, Z. -E., Michaels, R., Moffit, B., Monaghan, P., Nanda, S., Paschke, K. D., Perdrisat, C. F., Punjabi, V., Qattan, I. A., Ransome, R. D., Reimer, P. E., Reitz, B., Saha, A., Schulte, E. C., Sheyor, R., Slifer, K., Solvignon, P., Sulkosky, V., Urciuoli, G. M., Voutier, E., Wang, K., Wijesooriya, K., Wojtsekhowski, B., and Zhu, L.

Subjects
Nuclear Experiment, High Energy Physics - Experiment, Nuclear Theory
Abstract

We measured the angular dependence of the three recoil proton polarization components in two-body photodisintegration of the deuteron at a photon energy of 2 GeV. These new data provide a benchmark for calculations based on quantum chromodynamics. Two of the five existing models have made predictions of polarization observables. Both explain the longitudinal polarization transfer satisfactorily.. Transverse polarizations are not well described, but suggest isovector dominance., Comment: 5 pages, 1 figure, submitted to Physical Review Letters

Published
2007
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27. A Search for Sigma^0_5, N^0_5 and Theta^++ Pentaquark States

Author

Qiang, Y., Annand, J., Arrington, J., Azimov, Ya. I., Bertozzi, W., Cates, G., Chen, J. P., Choi, Seonho, Chudakov, E., Cusanno, F., de Jager, C. W., Epstein, M., Feuerbach, R. J., Garibaldi, F., Gayou, O., Gilman, R., Gomez, J., Hamilton, D. J., Hansen, J. -O., Higinbotham, D. W., Holmstrom, T., Iodice, M., Jiang, X., Jones, M., LeRose, J., Lindgren, R., Liyanage, N., Margaziotis, D. J., Markowitz, P., Mamyan, V., Michaels, R., Meziani, Z. -E., Monaghan, P., Munoz-Camacho, C., Nelyubin, V., Paschke, K., Piasetzky, E., Rachek, I., Reimer, P. E., Reinhold, J., Reitz, B., Roche, R., Saha, A., Sarty, A., Schulte, E., Shahinyan, A., Sheyor, R., Singh, J., Strakovsky, I. I., Subedi, R., Suleiman, R., Sulkovsky, V., Wojtsekhowski, B., and Zheng, X.

Subjects
High Energy Physics - Experiment, Nuclear Experiment
Abstract

A high-resolution (sigma_instr. = 1.5 MeV) search for narrow states (Gamma < 10 MeV) with masses of M_x approx 1500-1850 MeV in ep -> e'K^+ X, e'K^- X and e' pi^+ X electroproduction at small angles and low Q^2 was performed. These states would be candidate partner states of the reported Theta^+(1540) pentaquark. No statistically significant signal was observed in any of the channels at 90% C.L. Upper limits on forward production were determined to be between 0.7% and 4.2% of the Lambda(1520) production cross section, depending on the channel and the assumed mass and width of the state., Comment: 5 pages, 5 figures, to appear in Phys. Rev. C, update with responses to referee suggestions

Published
2006
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29. Precision Rosenbluth measurement of the proton elastic form factors

Author

Qattan, I. A., Arrington, J., Segel, R. E., Zheng, X., Aniol, K., Baker, O. K., Beams, R., Brash, E. J., Calarco, J., Camsonne, A., Chen, J. -P., Christy, M. E., Dutta, D., Ent, R., Frullani, S., Gaskell, D., Gayou, O., Gilman, R., Glashausser, C., Hafidi, K., Hansen, J. -O., Higinbotham, D. W., Hinton, W., Holt, R. J., Huber, G. M., Ibrahim, H., Jisonna, L., Jones, M. K., Keppel, C. E., Kinney, E., Kumbartzki, G. J., Lung, A., Margaziotis, D. J., McCormick, K., Meekins, D., Michaels, R., Monaghan, P., Moussiegt, P., Pentchev, L., Perdrisat, C., Punjabi, V., Ransome, R., Reinhold, J., Reitz, B., Saha, A., Sarty, A., Schulte, E. C., Slifer, K., Solvignon, P., Sulkosky, V., Wijesooriya, K., and Zeidman, B.

Subjects
Nuclear Experiment
Abstract

We report the results of a new Rosenbluth measurement of the proton form factors at Q^2 values of 2.64, 3.20 and 4.10 GeV^2. Cross sections were determined by detecting the recoiling proton in contrast to previous measurements in which the scattered electron was detected. At each Q^2, relative cross sections were determined to better than 1%. The measurement focussed on the extraction of G_E/G_M which was determined to 4-8% and found to approximate form factor scaling, i.e. \mu_p G_E \approx G_M. These results are consistent with and much more precise than previous Rosenbluth extractions. However, they are inconsistent with recent polarization transfer measurements of comparable precision, implying a systematic difference between the two techniques., Comment: 5 pages, 3 figures, submitted to PRL

Published
2004
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30. Strangeness Photoproduction at the BGO-OD Experiment

Author

Jude, T. C., Alef, S., Bauer, P., Beck, R., Cole, P., Di Salvo, R., Elsner, D., Fantini, A., Freyermuth, O., Ghio, F., Gridnev, A., Hammann, D., Hannappel, J., Kohl, K., Kozlenko, N., Lapik, A., Sandri, P. Levi, Lisin, V., Mandaglio, G., Messi, R., Moricciani, D., Nedorezov, V., Novinskiy, D., Pedroni, P., Polonski, A., Reitz, B., Romaniuk, M., Scheluchin, G., Schmieden, H., Sumachev, V., Tarakanov, V., and Tillmanns, C.

Published
2019
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31. K+Λ photoproduction at forward angles and low momentum transfer

Author

Alef, S., Bauer, P., Bayadilov, D., Beck, R., Bella, A., Bieling, J., Braghieri, A., Cole, P. L., Elsner, D., Di Salvo, R., Fantini, A., Freyermuth, O., Frommberger, F., Ghio, F., Goertz, S., Gridnev, A., Hammann, D., Hannappel, J., Jude, T. C., Kohl, K., Kozlenko, N., Lapik, A., Levi Sandri, P., Lisin, V., Mandaglio, G., Messi, F., Messi, R., Moricciani, D., Nedorezov, V., Nikonov, V. A., Novinskiy, D., Pedroni, P., Polonskiy, A., Reitz, B.-E., Romaniuk, M., Sarantsev, A. V., Scheluchin, G., Schmieden, H., Stuglev, A., Sumachev, V., Vegna, V., Tarakanov, V., and Zimmermann, T.

Published
2021
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32. The BGOOD experimental setup at ELSA

Author

Alef, S., Bauer, P., Bayadilov, D., Beck, R., Becker, M., Bella, A., Bieling, J., Böse, S., Braghieri, A., Brinkmann, K.-Th., Cole, P. L., Di Salvo, R., Elsner, D., Fantini, A., Freyermuth, O., Frommberger, F., Gervino, G., Ghio, F., Goertz, S., Gridnev, A., Gutz, E., Hammann, D., Hannappel, J., Hillert, W., Jahn, O., Jahn, R., Johnstone, J. R., Joosten, R., Jude, T. C., Kalinowsky, H., Kleber, V., Klein, F., Kohl, K., Koop, K., Kozlenko, N., Krusche, B., Lapik, A., Sandri, P. Levi, Lisin, V., Lopatin, I., Mandaglio, G., Manganaro, M., Messi, F., Messi, R., Moricciani, D., Mushkarenkov, A., Nedorezov, V., Novinskiy, D., Pedroni, P., Polonskiy, A., Reitz, B.-E., Romaniuk, M., Rostomyan, T., Scheluchin, G., Schmieden, H., Stugelev, A., Sumachev, V., Tarakanov, V., Vegna, V., Walther, D., Zaunick, H.-G., and Zimmermann, T.

Published
2020
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33. Erratum to: Strangeness Photoproduction at the BGO-OD Experiment

Author

Jude, T. C., Alef, S., Bauer, P., Beck, R., Cole, P., Di Salvo, R., Elsner, D., Fantini, A., Freyermuth, O., Ghio, F., Gridnev, A., Hammann, D., Hannappel, J., Kohl, K., Kozlenko, N., Lapik, A., Sandri, P. Levi, Lisin, V., Mandaglio, G., Messi, R., Moricciani, D., Nedorezov, V., Novinskiy, D., Pedroni, P., Polonski, A., Reitz, B., Romaniuk, M., Scheluchin, G., Schmieden, H., Sumachev, V., Tarakanov, V., and Tillmanns, C.

Published
2020
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34. Evidence of a dibaryon spectrum in coherent π0π0d photoproduction at forward deuteron angles

Author

Jude, T. C., Alef, S., Beck, R., Braghieri, A., Cole, P. L., Elsner, D., Di Salvo, R., Fantini, A., Freyermuth, O., Frommberger, F., Ghio, F., Goertz, S, Gridnev, A., Kohl, K., Kozlenko, N., Lapik, A., Sandri, P. Levi, Lisin, V., Mandaglio, G., Moricciani, D., Nedorezov, V., Novinsky, D., Pedroni, P., Polonskiy, A., Reitz, B. -E., Romaniuk, M., Scheluchin, G., Schmieden, H., Stuglev, A., Sumachev, V., and Tarakanov, V.

Subjects
Nuclear and High Energy Physics, Coherent photoproduction, Dibaryon, Settore FIS/04, BGOOD, Nuclear Experiment
Abstract

The coherent reaction, $\gamma d \rightarrow \pi^0\pi^0 d$ was studied with the BGOOD experiment at ELSA from threshold to a centre-of-mass energy of 2850\,MeV. A full kinematic reconstruction was made, with final state deuterons identified in the forward spectrometer and $\pi^0$ decays in the central BGO Rugby Ball. The strength of the differential cross section exceeds what can be described by models of coherent photoproduction and instead supports the three isoscalar dibaryon candidates reported by the ELPH collaboration at 2.38, 2.47 and 2.63\,GeV/c$^2$. A low mass enhancement in the $\pi^0\pi^0$ invariant mass is also observed at the $d^*(2380)$ centre-of-mass energy which is consistent with the ABC effect. At higher centre-of-mass energies, a narrow peak in the $\pi^0 d$ invariant mass at 2114\,MeV/c$^2$ with a width of 20\,MeV/c$^2$ supports a sequential two-dibaryon decay mechanism., Comment: 8 pages, 10 figures. Additional references (recommended by colleagues) added since the first revision

Published
2022

35. Photoproduction of K+Λ(1405)→K+π0Σ0 extending to forward angles and low momentum transfer

Author

Scheluchin, G., primary, Jude, T.C., additional, Alef, S., additional, Bauer, P., additional, Bayadilov, D., additional, Beck, R., additional, Braghieri, A., additional, Cole, P.L., additional, Elsner, D., additional, Di Salvo, R., additional, Fantini, A., additional, Freyermuth, O., additional, Frommberger, F., additional, Ghio, F., additional, Gridnev, A., additional, Hammann, D., additional, Hannappel, J., additional, Kohl, K., additional, Kozlenko, N., additional, Lapik, A., additional, Levi Sandri, P., additional, Lisin, V., additional, Mandaglio, G., additional, Messi, R., additional, Moricciani, D., additional, Mushkarenkov, A., additional, Nedorezov, V., additional, Novinskiy, D., additional, Pedroni, P., additional, Polonskiy, A., additional, Reitz, B.-E., additional, Romaniuk, M., additional, Schmieden, H., additional, Sumachev, V., additional, and Tarakanov, V., additional

Published
2022
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36. Evidence of a dibaryon spectrum in coherent π0π0d photoproduction at forward deuteron angles

Author

Jude, T.C., primary, Alef, S., additional, Beck, R., additional, Braghieri, A., additional, Cole, P.L., additional, Elsner, D., additional, Di Salvo, R., additional, Fantini, A., additional, Freyermuth, O., additional, Frommberger, F., additional, Ghio, F., additional, Gridnev, A., additional, Kohl, K., additional, Kozlenko, N., additional, Lapik, A., additional, Levi Sandri, P., additional, Lisin, V., additional, Mandaglio, G., additional, Moricciani, D., additional, Nedorezov, V., additional, Novinskiy, D., additional, Pedroni, P., additional, Polonskiy, A., additional, Reitz, B.-E., additional, Romaniuk, M., additional, Scheluchin, G., additional, Schmieden, H., additional, Stuglev, A., additional, Sumachev, V., additional, and Tarakanov, V., additional

Published
2022
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38. Hypernuclear spectroscopy in JLab’s Hall A

Author

The Hall A Collaboration, LeRose, J. J., Acha, A., Bydžovský, P., Chang, C. C., Cisbani, E., Cusanno, F., de Jager, C. W., De Leo, R., Feuerbach, R. J., Frullani, S., Garibaldi, F., Higinbotham, D. W., Iodice, M., Lagamba, L., Markowitz, P., Marrone, S., Reitz, B., Sotona, M., Urciuoli, G. M., Pochodzalla, Josef, editor, and Walcher, Thomas, editor

Published
2007
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39. Λ 9Li and Λ 16N high resolution spectroscopy by electron scattering at Jefferson Lab in Hall A

Author

Marrone, S., Acha, A., Bydzovsky, P., Cisbani, E., Chang, C. C., Cusanno, F., De Cataldo, G., De Leo, R., De Jager, C. W., Feuerbach, R. J., Frullani, S., Garibaldi, F., Higinbotham, D. W., Iodice, M., Kross, B., Lagamba, L., LeRose, J. J., Markowitz, P., Nappi, E., Michaels, R., Reitz, B., Segal, J., Sotona, M., Urciuoli, G. M., Wojtsekhowski, B., Zorn, C., Pochodzalla, Josef, editor, and Walcher, Thomas, editor

Published
2007
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40. Observation of a cusp-like structure in the γp → K+Σ0 cross section at forward angles and low momentum transfer

Author

Jude, T.C., Alef, S., Bauer, P., Bayadilov, D., Beck, R., Bella, A., Bieling, J., Braghieri, A., Cole, P.L., Elsner, D., Di Salvo, R., Fantini, A., Freyermuth, O., Frommberger, F., Ghio, F., Goertz, S., Gridnev, A., Hammann, D., Hannappel, J., Kohl, K., Kozlenko, N., Lapik, A., Levi Sandri, P., Lisin, V., Mandaglio, G., Messi, F., Messi, R., Moricciani, D., Nedorezov, V., Nikonov, V.A., Novinskiy, D., Pedroni, P., Polonskiy, A., Reitz, B.-E., Romaniuk, M., Sarantsev, A.V., Scheluchin, G., Schmieden, H., Stuglev, A., Sumachev, V., Vegna, V., Tarakanov, V., and Zimmermann, T.

Published
2021
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43. Puzzle with the precession of the neutron spin

Author

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

Subjects
spin: precession, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], nucleon: structure, strong interaction, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nonperturbative, spin: polarizability, momentum transfer: low, electromagnetic field, effective field theory: chiral, Nuclear Experiment, n: spin, experimental results, Jefferson Lab
Abstract

Understanding the structure of the nucleon (proton and neutron) is a critical problem in physics. Especially challenging is to understand the spin structure when the Strong Interaction becomes truly strong. At energy scales below the nucleon mass (~1 GeV), the intense interactions of the quarks and gluons inside the nucleon makes them highly correlated. Their coherent behavior causes the emergence of effective hadronic degrees of freedom (hadrons are composite particles made of quarks and gluons) which are necessary to understand the nucleon properties. Theoretically studying this subject requires approaches employing non-perturbative techniques or using hadronic degrees of freedom, e.g. chiral effective field theory (chiEFT). Here, we present measurements sensitive to the neutron's spin precession under electromagnetic fields. The observables, the generalized spin-polarizabilities delta_LT and gamma_0, which quantify the nucleon spin's precession, were measured at very low energy-momentum transfer squared Q^2 corresponding to probing distances of the size of the nucleon. Our Q^2 values match the domain where chiEFT calculations are expected to be applicable. The calculations have been conducted to high degrees of sophistication, including that of the so-called "gold-plated" observable, delta_LT. Surprisingly however, our data show a strong discrepancy with the chiEFT calculations. This presents a challenge to the current description of the neutron's spin properties.

Published
2021

44. Measurement of the $��n\rightarrow K^0��^0$ differential cross section over the $K^*$ threshold

Author

Kohl, K., Alef, S., Beck, R., Braghieri, A., Cole, P., Salvo, R. D., Fantini, A., Freyermuth, O., Frommberger, F., Ghio, F., Goertz, S., Gridnev, A., Hammann, D., Hannappel, J., Jude, T., Kozlenko, N., Lapik, A., Sandri, P. Levi, Lisin, V., Mandaglio, G., Messi, R., Moricciani, D., Nedorezov, V., Nikonov, V. A., Novinsky, D., Pedroni, P., Polonski, A., Reitz, B. -E., Romaniuk, M., Scheluchin, G., Schmieden, H., Stuglev, A., Sumachev, V., and Tarakanov, V.

Subjects
High Energy Physics::Phenomenology, Nuclear Theory, FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

The differential cross section for the quasi-free photoproduction reaction $��n\rightarrow K^0��^0$ was measured at BGOOD at ELSA from threshold to a center-of-mass energy of 2400 MeV. An increase in the cross section is observed at forward angles above 2000 MeV. The available statistics prevent an accurate description of this behavior, however it appears consistent with models describing a resonance of dynamically generated vector meson-baryon states, where an equivalent model predicted the $P_C$ states observed at LHCb. If proven correct, this could indicate parallels between the strange and charmed quark sectors., 6 pages, 8 figures

Published
2021
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46. Upgrade of the proximity focusing RICH at JLab

Author

Cisbani, E., Colilli, S., Cusanno, F., Fratoni, R., Frullani, S., Garibaldi, F., Giuliani, F., Gricia, M., Lucentini, M., Santavenere, F., Urciuoli, G.M., Iodice, M., Argentieri, A., De Cataldo, G., De Leo, R., Lagamba, L., Marrone, S., Nappi, E., Camsonne, A., Kross, B., Michaels, R., Reitz, B., Segal, J., Wojtsekhowski, B., Zorn, C., Monno, E., and Breuer, H.

Published
2008
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48. Measurement of the 3He spin-structure functions and of neutron (3He) spin-dependent sum rules at 0.035 ≤ Q2 ≤ 0.24 GeV2

Author

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

Published
2020
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