Threshold π0 photoproduction on transverse polarised protons at MAMI

Autor: V. Sokhoyan, S. Costanza, B. Krusche, H. J. Arends, G. M. Huber, T. Rostomyan, Lothar Tiator, V. L. Kashevarov, M. H. Sikora, M. Ostrick, L. V. Fil'kov, P. Hall-Barrientos, S. N. Prakhov, C. S. Akondi, W. Gradl, A. Polonski, S. Garni, D. I. Glazier, A. J. Sarty, A. Braghieri, D. Hornidge, B. Oussena, C. Collicott, E. J. Downie, A. Thomas, A. Mushkarenkov, V. Lisin, E. F. McNicoll, D. P. Watts, K. Livingston, Durga Paudyal, I. Keshelashvili, David Hamilton, R. Miskimen, Lilian Witthauer, N. S. Borisov, W. Meyer, M. Wolfes, P. Pedroni, V. V. Polyanski, R. Kondratiev, J. Mancel, G. Reicherz, Igor Strakovsky, A. B. Neganov, César Fernández-Ramírez, A. B. Lazarev, A. Nikolaev, G. M. Gurevich, B. M. K. Nefkens, D. G. Middleton, Th. Strub, H. Ortega, M. Dieterle, Reinhard Beck, Yu. A. Usov, O. Steffen, J. R. M. Annand, W. J. Briscoe, S. Cherepnya, P. Ott, I. J. D. MacGregor, David Manley, A. Fix, D. Werthmüller, P. P. Martel, Aron M. Bernstein, I. Supek, M. Oberle, M. Unverzagt, D. Howdle, M. Korolija, S. Schumann, P. B. Otte

Publikováno v: Physics Letters B. 750:252-258

Polarisation-dependent differential cross sections σ T associated with the target asymmetry T have been measured for the reaction γ p → → p π 0 with transverse target polarisation from π 0 threshold to photon energies of 190 MeV. The data wer

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a948efcb0493509f926ac157d584b2ed
https://doi.org/10.1016/j.physletb.2015.09.015

Measurement of the π0→e+e−γ Dalitz decay at the Mainz Microtron

Autor: N. K. Walford, E. Mornacchi, C. Collicott, K. Spieker, K. Livingston, T. C. Jude, B. Strandberg, S. Gardner, N. S. Borisov, H. J. Arends, S. Cherepnya, D. P. Watts, V. Metag, E. J. Downie, M. I. Ferretti Bondy, K. Bantawa, C. Sfienti, H. Berghäuser, J. Robinson, J. Wettig, P. Pedroni, D. Hornidge, P. B. Otte, G. M. Huber, G. Rosner, R. A. Miskimen, V. Sokhoyan, Igor Strakovsky, M. Unverzagt, S. Garni, C. S. Akondi, A. Käser, S. Kay, J. Linturi, M. Ostrick, M. Dieterle, I. Keshelashvili, Yu. A. Usov, P. Drexler, P. Aguar-Bartolomé, O. Steffen, P. Adlarson, Michaela Thiel, V. L. Kashevarov, D. I. Glazier, M. Biroth, F. Cividini, A. Thiel, M. Oberle, R. Kondratiev, G. M. Gurevich, Guy Ron, Z. Ahmed, V. Lisin, D. M. Manley, D. Werthmüller, F. Afzal, E. F. McNicoll, S. Wagner, V. V. Kulikov, A. B. Neganov, Susanna Costanza, A. Rajabi, P. Ott, B. Krusche, M. A. Martemianov, C. Mullen, W. J. Briscoe, A. N. Mushkarenkov, A. Nikolaev, J. C. McGeorge, W. Gradl, P. P. Martel, Lilian Witthauer, A. G. Denig, M. Korolija, R. Beck, Lorenzo Zana, D. Glowa, Durga Paudyal, L. V. Fil'kov, M. Wolfes, A. B. Lazarev, I. Supek, A. Braghieri, A. Neiser, Th. Strub, D. G. Middleton, I. J. D. MacGregor, T. Rostomyan, J. R. M. Annand, A. Polonski, S. N. Prakhov, David Hamilton, Andy Thomas, M. H. Sikora, Roderick M. Macrae

Publikováno v: Physical Review C. 95

The Dalitz decay π0→e+e−γ has been measured in the γp→π0p reaction with the A2 tagged-photon facility at the Mainz Microtron, MAMI. The value obtained for the slope parameter of the π0 electromagnetic transition form factor, aπ=0.030±0.0

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::70ca58630900d49efd226d953488864a
https://doi.org/10.1103/physrevc.95.025202

Measurement of the beam-helicity asymmetry I⊙ in the photoproduction of π0-pairs off the proton and off the neutron

Autor: A. Polonski, I. Keshelashvili, M. Thiel, T. Rostomyan, Yasser Maghrbi, F. Zehr, Volker Metag, R. Beck, E. Heid, S. P. Kruglov, J. Mancell, G. M. Huber, D. I. Sober, E. J. Downie, D. M. Manley, M. Korolija, I. Supek, E. F. McNicoll, B. Demissie, J. R. M. Annand, P. A. Bartolome, S. Schumann, R. W. Novotny, M. H. Sikora, S. N. Prakhov, P. Pedroni, M. Ostrick, S. Cherepnya, D. P. Watts, D. I. Glazier, Sasa Micanovic, K. Bantawa, A. Käser, D. Howdle, Lilian Witthauer, V. S. Bekrenev, Z. Marinides, A. Starostin, D. Werthmüller, M. Martinez, M. Oberle, V. L. Kashevarov, Andy Thomas, G. Rosner, I. J. D. MacGregor, W. J. Briscoe, A. N. Mushkarenkov, Jason Brudvik, A. Nikolaev, A. Kulbardis, M. Unverzagt, B. M. K. Nefkens, P. Drexler, D. Hornidge, B. Krusche, M. Dieterle, J. Robinson, F. Pheron, D. G. Middleton, L.V. Filʼkov, V. Lisin, B. Oussena, O. Jahn, J. C. McGeorge, K. Livingston, T. C. Jude, D. Branford, I. Jaegle, R. Kondratiev, J. Ahrens, A. Braghieri, H. J. Arends, A. Fix, H. Berghäuser, D. Mekterovic

Publikováno v: Physics Letters B. 721:237-243

Beam-helicity asymmetries have been measured at the MAMI accelerator in Mainz for the photoproduction of neutral pion pairs in the reactions γ → p → p π 0 π 0 and γ → d → ( n ) p π 0 π 0 , γ → d → ( p ) n π 0 π 0 off free protons

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fd7081abcc3060dea152e975872e525b
https://doi.org/10.1016/j.physletb.2013.03.021

Photoproduction of $\eta$ $\pi$ pairs off nucleons and deuterons

Autor: M. Ostrick, B. Oussena, D. P. Watts, K. Livingston, T. C. Jude, J. R. M. Annand, K. Bantawa, D. Hornidge, H. J. Arends, J. C. McGeorge, Michaela Thiel, W. J. Briscoe, A. N. Mushkarenkov, D. M. Manley, M. Korolija, T. Rostomyan, I. Supek, A. Starostin, S. Schumann, A. Fix, P. A. Bartolome, J. Robinson, D. Mekterovic, Susanna Costanza, A. Braghieri, Th. Strub, M. H. Sikora, D. G. Middleton, R. W. Novotny, P. B. Otte, E. J. Downie, G. M. Huber, V. Metag, R. Beck, M. Dieterle, J. Mancell, D. I. Sober, V. L. Kashevarov, M. Unverzagt, V. Lisin, I. Jaegle, D. Howdle, F. Pheron, B. Krusche, J. Ahrens, R. Kondratiev, D. Werthmueller, F. Mueller, A. Kaeser, D. I. Glazier, Lilian Witthauer, I. J. D. MacGregor, L. V. Fil'kov, S. N. Prakhov, E. F. McNicoll, David Hamilton, A. Nikolaev, A. Polonski, N. K. Walford, Andy Thomas, M. Oberle, P. Drexler, S. Cherepnya, I. Keshelashvili, P. Pedroni, Sasa Micanovic, S. Garni, Z. Marinides, Yasser Maghrbi

Publikováno v: The European physical journal / A 52(9), 272 (2016). doi:10.1140/epja/i2016-16272-1

Quasi-free photoproduction of $\pi\eta$-pairs has been investigated from threshold up to incident photon energies of 1.4 GeV, respectively up to photon-nucleon invariant masses up to 1.9 GeV. Total cross sections, angular distributions, invariant-mas

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::93c08e78dca5f4f74979f6a194ffa439
https://juser.fz-juelich.de/record/820981

First measurement of the circular beam asymmetry in the γ→p→π0ηp reaction

Autor: M. Kotulla, M. H. Sikora, A. Koulbardis, E. J. Downie, I.I. Stakovsky, D. G. Middleton, P. Aguar-Bartolomé, D. Branford, Yasser Maghrbi, C. M. Tarbert, T. Rostomyan, M. Ostrick, A. Nikolaev, L. K. Akasoy, W. J. Briscoe, A. N. Mushkarenkov, B. M. K. Nefkens, D. Werthmüller, A. Braghieri, F. Zehr, M. Martinez-Fabregate, R. F. B. Codling, J. D. Kellie, D. Mekterovic, S. P. Kruglov, R. Beck, D. I. Glazier, I. Jaegle, R. Kondratiev, R. Gregor, I. Zamboni, B. Demissie, B. Oussena, D. P. Watts, I. M. Suarez, K. Bantawa, V. S. Bekrenev, I. Keshelashvili, D. I. Sober, V. Metag, J. Robinson, F. Pheron, M. Unverzagt, I. J. D. MacGregor, A. Starostin, S. Cherepnya, E. Heid, D. Hornidge, L. V. Fil'kov, A. Polonski, V. L. Kashevarov, H. Berghäuser, K. Livingston, T. C. Jude, P. Pedroni, Jason Brudvik, J. R. M. Annand, Sasa Micanovic, H. J. Arends, A. Fix, E. F. McNicoll, G. Rosner, S. Schumann, R. W. Novotny, P. B. Otte, B. Krusche, Michaela Thiel, D. M. Manley, M. Korolija, S. N. Prakhov, Andy Thomas, J. C. McGeorge, V. Lisin, O. Jahn, David Hamilton, P. Drexler, I. Supek

Publikováno v: Physics Letters B. 693:551-554

The circular photon asymmetry for π 0 η photoproduction on the proton was measured for the first time at the tagged photon facility of the MAMI C accelerator using the Crystal Ball/TAPS photon spectrometer. The experimental results are interpreted

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5764faf9369a78b74a1e1ee999f48b30
https://doi.org/10.1016/j.physletb.2010.09.028