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1. Cross Section for $��n \to ��^0 n$ measured at Mainz/A2

Author

Briscoe, W. J., Hadzimehmedovi, M., Kudryavtsev, A. E., Kulikov, V. V., Martemianov, M. A., Strakovsky, I. I., Svarc, A., Tarasov, V. E., Workman, R. L., Abt, S., Achenbach, P., Akondi, C. S., Afzal, F., Aguar-Bartolome, P., Ahmed, Z., Annand, J. R. M., Arends, H. J., Bantawa, K., Bashkanov, M., Beck, R., Biroth, M., Borisov, N., Braghieri, A., Bulychjov, S. A., Cividini, F., Collicott, C., Costanza, S., Denig, A., Downie, E. J., Drexler, P., Fegan, S., Bondy, M. I. Ferretti, Gardner, S., Ghosal, D., Glazier, D. I., Gorodnov, I., Gradl, W., Gunther, M., Gurevich, D., Heijkenskjold, L., Hornidge, D., Huber, G. M., Kaeser, M., Kashevarov, V. L., Kay, S., Korolija, M., Krusche, B., Lazarev, A., Livingston, K., Lutterer, S., MacGregor, I. J. D., Macrae, R., Manley, D. M., Martel, P. P., McGeorge, J. C., Middleton, D. G., Miskimen, R., Mornacchi, E., Mushkarenkov, A., Mullen, C., Neganov, A., Neiser, A., Ostrick, M., Otte, P. B., Osmanovic, H., Oussena, R. Omerovic B., Paudyal, D., Pedroni, P., Powell, A., Prakhov, S. N., Ron, G., Rostomyan, T., Sarty, A., Senti, C., Sokhoyan, V., Spieker, K., Stahov, J., Steffen, O., Supek, I., Thiel, A., Thiel, M., Thomas, A., Tiator, L., Unverzagt, M., Usov, Yu. A., Walford, N. K., Watts, D. P., Wagner, S., Werthmueller, D., Wettig, J., Wolfes, M., and Zachariou, N.

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

The $��n \to ��^0 n$ differential cross section evaluated for 27 energy bins span the photon-energy range 290-813 MeV (W = 1.195-1.553 GeV) and the pion c.m. polar production angles, ranging from 18 deg to 162 deg, making use of model-dependent nuclear corrections to extract pi0 production data on the neutron from measurements on the deuteron target. Additionally, the total photoabsorption cross section was measured. The tagged photon beam produced by the 883-MeV electron beam of the Mainz Microtron MAMI was used for the 0-meson production. Our accumulation of 3.6 x 10^6 $��n \to ��^0 n$ events allowed a detailed study of the reaction dynamics. Our data are in reasonable agreement with previous A2 measurements and extend them to lower energies. The data are compared to predictions of previous SAID, MAID, and BnGa partial-wave analyses and to the latest SAID fit MA19 that included our data. Selected photon decay amplitudes $N^* \to ��n$ at the resonance poles are determined for the first time., 16 pages, 12 figures, 3 tables

Published
2019
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2. Single-Energy Partial Wave Analysis for $��^0$ Photoproduction on Proton with Fixed-$t$ Analyticity Imposed

Author

Osmanovi��, H., Had��imehmedovi��, M., Omerovi��, R., Stahov, J., Gorchtein, M., Kashevarov, V., Nikonov, K., Ostrick, M., Tiator, L., and ��varc, A.

Subjects
Nuclear Theory (nucl-th), High Energy Physics - Phenomenology (hep-ph), FOS: Physical sciences
Abstract

High precision data of the $��p \to ��^0 p$ reaction from its threshold up to $W=2$~GeV have been used in order to perform a single-energy partial wave analysis with minimal model dependence. Continuity in energy was achieved by imposing constraints from fixed-$t$ analyticity in an iterative procedure. Reaction models were only used as starting point in the very first iteration. We demonstrate that with this procedure partial wave amplitudes can be obtained which show only a minimal dependence on the initial model assumptions., 25 pages, 13 figures

Published
2019
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3. The role of angle dependent phase rotations of reaction amplitudes in $��$ photoproduction on protons

Author

��varc, A., Osmanovi��, H., Had��imehmedovi��, M., Omerovi��, R., Stahov, J., Kashevarov, V., Nikonov, K., Ostrick, M., and Tiator, L.

Subjects
Nuclear Theory (nucl-th), FOS: Physical sciences, Nuclear Experiment (nucl-ex)
Abstract

It has recently been proven that the invariance of observables with respect to angle dependent phase rotations of reaction amplitudes mixes multipoles changing also their relative strength [1]. All contemporary partial wave analyses (PWA) in $��$ photoproduction on protons, either energy dependent (ED) [2-5] or single energy (SE) [6] do not take this effect into consideration. It is commonly accepted that there exist quite some similarity in the $E0+$ multipole for all PWA, but notable differences in this, but also in remaining partial waves still remain. In this paper we demonstrate that once this phase rotations are properly taken into account, all contemporary ED and SE partial wave analysis become almost identical for the dominant $E0+$ multipole, and the agreement among all other multipoles becomes much better. We also show that the the measured observables are almost equally well reproduced for all PWA, and the remaining differences among multipoles can be attributed solely to the difference of predictions for unmeasured observables. So, new measurements are needed.

Published
2018
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4. $N^*$ resonances from $K��$ amplitudes in sliced bins in energy

Author

Anisovich, A. V., Burkert, V., Had��imehmedovi��, M., Ireland, D. G., Klempt, E., Nikonov, V. A., Omerovi��, R., Sarantsev, A. V., Stahov, J., ��varc, A., and Thoma, U.

Subjects
FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

The two reactions $��p\to K^+��$ and $��^-p\to K^0��$ are analyzed to determine the leading photoproduction multipoles and the pion-induced partial wave amplitudes in slices of the invariant mass. The multipoles and the partial-wave amplitudes are simultaneously fitted in a multichannel Laurent+Pietarinen model (L+P model), which determines the poles in the complex energy plane on the second Riemann sheet close to the physical axes. The results from the L+P fit are compared with the results of an energy-dependent fit based on the Bonn-Gatchina (BnGa) approach. The study confirms the existence of several poles due to nucleon resonances in the region at about 1.9\,GeV with quantum numbers $J^P = 1/2^+$, $3/2^+, 1/2^-, 3/2^-, 5/2^-$., 18 pages, 12 figures

Published
2017
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5. π±p differential cross sections at low energies

Author

Denz, H., Amaudruz, P., Brack, J.T., Breitschopf, J., Camerini, P., Clark, J.L., Clement, H., Felawka, L., Fragiacomo, E., Gibson, E.F., Grion, N., Hofman, G.J., Jamieson, B., Mathie, E.L., Meier, R., Moloney, G., Ottewell, D., Patarakin, O., Patterson, J.D., Pavan, M.M., Piano, S., Raywood, K., Ristinen, R.A., Rui, R., Sevior, M.E., Smith, G.R., Stahov, J., Tacik, R., Wagner, G.J., von Wrochem, F., and Yeomans, D.M.

Subjects
Nuclear and High Energy Physics
Published
2006
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6. Strange Hadron Spectroscopy with a Secondary KL Beam at GlueX

Author

Adhikari, S., Al Ghoul, H., Ali, A., Amaryan, M. J., Anassontzis, E. G., Anisovich, A. V., Austregesilo, A., Baalouch, M., Barbosa, F., Barnes, A., Bashkanov, M., Beattie, T. D., Bellwied, R., Berdnikov, V. V., Black, T., Boeglin, W., Briscoe, W. J., Britton, T., Brooks, W. K., Cannon, B. E., Chudakov, E., Cole, P. L., Crede, V., Dalton, M. M., Deur, A., Degtyarenko, P., Dobbs, S., Dodge, G., Dolgolenko, A. G., Döring, M., Dugger, M., Dzhygadlo, R., Edwards, R., Egiyan, H., Eidelman, S., Ernst, A., Eskandarian, A., Euginio, P., Fanelli, C., Fegan, S., Foda, A. M., Frye, J., Furletov, S., Gan, L., Gasparian, A., Gavalian, G., Gauzshtein, V., Gevorgyan, N., Glazier, D. I., Goetzen, K., Goity, J., Goryachev, V. S., Guo, L., Haberzettl, H., Hadžimehmedović, M., Hakobyan, H., Hamdi, A., Han, S., Hardin, J., Hayrapetyan, A., Horn, T., Huber, G. M., Hyde, C. E., Ireland, D. G., Ito, M. M., Jackson, B. C., Jarvis, N. S., Jones, R. T., Kakoyan, V., Kalicy, G., Kamel, M., Keith, C. D., Kim, C. W., Klein, F. J., Kourkoumeli, C., Kuleshov, S., Kuznetsov, I., Laptev, A. B., Larin, I., Lawrence, D., Levillain, M., Levine, W. I., Livingston, K., Lolos, G. J., Lyubovitskij, V. E., Mack, D., Mai, M., Manley, D. M., Meißner, U. -G, Marukyan, H., Mathieu, V., Mattione, P. T., Matveev, M., Matveev, V., Mccaughan, M., Mccracken, M., Mcginley, W., Mcintyre, J., Curtis Meyer, Miskimen, R., Mitchell, R. E., Mokaya, F., Mokeev, V., Nakayama, K., Nerling, F., Oh, Y., Osmanović, H., Ostrovidov, A. I., Omerović, R., Papandreou, Z., Park, K., Pasyuk, E., Patsyuk, M., Pauli, P., Pedroni, R., Pennington, M. R., Pentchev, L., Peters, K. J., Phelps, W., Pooser, E., Pratt, B., Price, J. W., Qin, N., Reinhold, J., Richards, D., Riska, D. -O, Ritchie, B. G., Ritman, J., Robison, L., Romanov, D., Ryu, H-Y, Salgado, C., Santopinto, E., Sarantsev, A. V., Schumacher, R. A., Schwarz, C., Schwiening, J., Semenov, A., Semenov, I., Seth, K. K., Shepherd, M. R., Smith, E. S., Sober, D. I., Sokhan, D., Somov, A., Somov, S., Soto, O., Sparks, N., Stahov, J., Staib, M. J., Stevens, J. R., Strakovsky, I. I., Subedi, A., Švarc, A., Szczepaniak, A., Tarasov, V., Taylor, S., Teymurazyan, A., Tomaradze, A., Tsaris, A., Vasileiadis, G., Watts, D., Werthmüller, D., Wickramaarachchi, N., Whitlatch, T., Williams, M., Wojtsekhowski, B., Workman, R. L., Xiao, T., Yang, Y., Zachariou, N., Zarling, J., Zhang, Z., Zou, B., Zhang, J., Zhou, X., and Zihlmann, B.

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