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The data available from the A2 Collaboration at MAMI were analyzed to select the $\gamma p\to \pi^0\eta p$ reaction on an event-by-event basis, which allows for partial-wave analyses of three-body final states to obtain more reliable…

Background: Photoproduction of pion pairs allows to study sequential decays of nucleon resonances via excited intermediate states. Such decays are important e.g. for states which in the quark model have both oscillators excited and…

High statistics measurements of the photon asymmetry $\mathrm{\Sigma}$ for the $\overrightarrow{\gamma}$p$\rightarrow\pi^{0}$p reaction have been made in the center of mass energy range W=1214-1450 MeV. The data were measured with the MAMI…

The reactions $\gamma p\to \eta p$ and $\gamma p\to \eta' p$ have been measured from their thresholds up to the center-of-mass energy $W=1.96$GeV with the tagged-photon facilities at the Mainz Microtron, MAMI. Differential cross sections…

Beam-helicity asymmetries for the gamma+p -> pi+ + pi- + p reaction have been measured for center-of-mass energies between 1.35 GeV and 2.30 GeV at Jefferson Lab with the CEBAF Large Acceptance Spectrometer using circularly polarized tagged…

Nuclear Experiment · Physics 2019-08-14 S. Strauch

The photon asymmetry in the reaction p(\vec{\gamma},\pi^{0})p close to threshold has been measured for the first time with the photon spectrometer TAPS using linearly polarized photons from the tagged-photon facility at the Mainz Microtron…

The beam-helicity asymmetry has been measured simultaneously for the reactions (e p \to e p \gamma) and (e p \to e p \pi^0) in the $\Delta (1232)$ resonance region at $Q^2=$ 0.35 (GeV/c)$^2$. The experiment was performed at MAMI with a…

Photon beam asymmetry $\Sigma$ measurements for $\omega$ photoproduction in the reaction $\vec{\gamma} p \to \omega p$ are reported for photon energies from 1.152 to 1.876 GeV. Data were taken using a linearly-polarized tagged photon beam,…

Nuclear Experiment · Physics 2018-02-01 CLAS Collaboration , P. Collins , B. G. Ritchie , M. Dugger , F. J. Klein , A. V. Anisovich , E. Klempt , V. A. Nikonov , A. Sarantsev , K. P. Adhikari , S. Adhikari , D. Adikaram , Z. Akbar , S. Anefalos Pereira , H. Avakian , J. Ball , N. A. Baltzell , M. Bashkanov , M. Battaglieri , V. Batourine , I. Bedlinskiy , A. S. Biselli , S. Boiarinov , W. J. Briscoe , W. K. Brooks , V. D. Burkert , Frank Thanh Cao , T. Cao , D. S. Carman , A. Celentano , G. Charles , T. Chetry , G. Ciullo , L. Clark , P. L. Cole , M. Contalbrigo , O. Cortes , V. Crede , N. Dashyan , R. De Vita , E. De Sanctis , M. Defurne , A. Deur , C. Djalali , R. Dupre , H. Egiyan , A. El Alaoui , L. El Fassi , P. Eugenio , G. Fedotov , A. Filippi , J. A. Fleming , Y. Ghandilyan , G. P. Gilfoyle , K. L. Giovanetti , F. X. Girod , D. I. Glazier , C. Gleason , E. Golovatch , R. W. Gothe , K. A. Griffioen , M. Guidal , K. Hafidi , H. Hakobyan , C. Hanretty , N. Harrison , M. Hattawy , D. Heddle , K. Hicks , G. Hollis , M. Holtrop , S. M. Hughes , Y. Ilieva , D. G. Ireland , B. S. Ishkhanov , E. L. Isupov , D. Jenkins , H. Jiang , H. S. Jo , S. Joosten , D. Keller , G. Khachatryan , M. Khachatryan , M. Khandaker , A. Kim , W. Kim , A. Klein , V. Kubarovsky , S. V. Kuleshov , L. Lanza , P. Lenisa , K. Livingston , I. J. D. MacGregor , N. Markov , B. McKinnon , C. A. Meyer , Z. E. Meziani , T. Mineeva , V. Mokeev , R. A. Montgomery , A. Movsisyan , E. Munevar , C. Munoz Camacho , P. Nadel-Turonski , L. A. Net , S. Niccolai , G. Niculescu , I. Niculescu , M. Osipenko , A. I. Ostrovidov , M. Paolone , R. Paremuzyan , K. Park , E. Pasyuk , W. Phelps , S. Pisano , O. Pogorelko , J. W. Price , S. Procureur , Y. Prok , D. Protopopescu , B. A. Raue , M. Ripani , A. Rizzo , G. Rosner , F. Sabatie , C. Salgado , R. A. Schumacher , Y. G. Sharabian , A. Simonyan , Iu. Skorodumina , G. D. Smith , D. I. Sober , D. Sokhan , N. Sparveris , I. Stankovic , S. Stepanyan , I. I. Strakovsky , S. Strauch , M. Taiuti , M. Ungaro , H. Voskanyan , E. Voutier , N. K. Walford , D. P. Watts , X. Wei , M. H. Wood , N. Zachariou , J. Zhang , Z. W. Zhao

The reaction $\gamma p \to \pi^\circ \gamma^\prime p$ has been measured with the TAPS calorimeter at the Mainz Microtron accelerator facility MAMI for energies between $\sqrt{s}$ = 1221--1331 MeV. Cross sections differential in angle and…

Beam asymmetries for the reactions gamma p -> p pi0 and gamma p -> n pi+ have been measured with the CEBAF Large Acceptance Spectrometer (CLAS) and a tagged, linearly polarized photon beam with energies from 1.102 to 1.862 GeV. A Fourier…

Nuclear Experiment · Physics 2015-06-16 M. Dugger , B. G. Ritchie , P. Collins , E. Pasyuk , W. J. Briscoe , I. I. Strakovsky , R. L. Workman , Y. Azimov

A novel interferometric method for absolute beam energy measurement is under development at MAMI. At the moment, the method is tested and optimized at an energy of 195 MeV. Despite the very small statistical uncertainty of the method,…

Instrumentation and Detectors · Physics 2018-09-28 P. Klag , P. Achenbach , M. Biroth , T. Gogami , P. Herrmann , M. Kaneta , Y. Konishi , W. Lauth , S. Nagao , S. N. Nakamura , J. Pochodzalla , J. Roser , Y. Toyama

The double polarization (beam-recoil) observables Ox and Oz have been measured for the reaction gamma p -> K Lambda from threshold production to Egamma = 1500 MeV. The data were obtained with the linearly polarized beam of the GRAAL…

We report measurements of the photon beam asymmetry $\Sigma$ for the reactions $\vec{\gamma}p\to p\pi^0$ and $\vec{\gamma}p\to p\eta $ from the GlueX experiment using a 9 GeV linearly-polarized, tagged photon beam incident on a liquid…

Nuclear Experiment · Physics 2017-05-16 GlueX Collaboration , H. Al Ghoul , E. G. Anassontzis , A. Austregesilo , F. Barbosa , A. Barnes , T. D. Beattie , D. W. Bennett , V. V. Berdnikov , T. Black , W. Boeglin , W. J. Briscoe , W. K. Brooks , B. E. Cannon , O. Chernyshov , E. Chudakov , V. Crede , M. M. Dalton , A. Deur , S. Dobbs , A. Dolgolenko , M. Dugger , R. Dzhygadlo , H. Egiyan , P. Eugenio , C. Fanelli , A. M. Foda , J. Frye , S. Furletov , L. Gan , A. Gasparian , A. Gerasimov , N. Gevorgyan , K. Goetzen , V. S. Goryachev , L. Guo , H. Hakobyan , J. Hardin , A. Henderson , G. M. Huber , D. G. Ireland , M. M. Ito , N. S. Jarvis , R. T. Jones , V. Kakoyan , M. Kamel , F. J. Klein , R. Kliemt , C. Kourkoumeli , S. Kuleshov , I. Kuznetsov , M. Lara , I. Larin , D. Lawrence , W. I. Levine , K. Livingston , G. J. Lolos , V. Lyubovitskij , D. Mack , P. T. Mattione , V. Matveev , M. McCaughan , M. McCracken , W. McGinley , J. McIntyre , R. Mendez , C. A. Meyer , R. Miskimen , R. E. Mitchell , F. Mokaya , K. Moriya , F. Nerling , G. Nigmatkulov , N. Ochoa , A. I. Ostrovidov , Z. Papandreou , M. Patsyuk , R. Pedroni , M. R. Pennington , L. Pentchev , K. J. Peters , E. Pooser , B. Pratt , Y. Qiang , J. Reinhold , B. G. Ritchie , L. Robison , D. Romanov , C. Salgado , R. A. Schumacher , C. Schwarz , J. Schwiening , A. Yu. Semenov , I. A. Semenova , K. K. Seth , M. R. Shepherd , E. S. Smith , D. I. Sober , A. Somov , S. Somov , O. Soto , N. Sparks , M. J. Staib , J. R. Stevens , I. I. Strakovsky , A. Subedi , V. Tarasov , S. Taylor , A. Teymurazyan , I. Tolstukhin , A. Tomaradze , A. Toro , A. Tsaris , G. Vasileiadis , I. Vega , N. K. Walford , D. Werthmuller , T. Whitlatch , M. Williams , E. Wolin , T. Xiao , J. Zarling , Z. Zhang , B. Zihlmann , V. Mathieu , J. Nys

The photoproduction of $\omega$ mesons off the proton has been studied in the reaction $\gamma p\to p\,\omega$ using the CEBAF Large Acceptance Spectrometer (CLAS) and the frozen-spin target (FROST) in Hall B at the Thomas Jefferson…

Nuclear Experiment · Physics 2019-08-13 P. Roy , Z. Akbar , S. Park , V. Crede , A. V. Anisovich , I. Denisenko , E. Klempt , V. A. Nikonov , A. V. Sarantsev , K. P. Adhikari , S. Adhikari , S. Anefalos Pereira , J. Ball , I. Balossino , M. Bashkanov , M. Battaglieri , V. Batourine , I. Bedlinskiy , A. S. Biselli , S. Boiarinov , W. J. Briscoe , J. Brock , W. K. Brooks , V. D. Burkert , C. Carlin , D. S. Carman , A. Celentano , G. Charles , T. Chetry , G. Ciullo , B. A. Clary , P. L. Cole , M. Contalbrigo , A. D'Angelo , N. Dashyan , R. De Vita , A. Deur , C. Djalali , M. Dugger , R. Dupre , A. El Alaoui , L. El Fassi , L. Elouadrhiri , P. Eugenio , G. Fedotov , S. Fegan , A. Filippi , A. Fradi , G. Gavalian , N. Gevorgyan , G. P. Gilfoyle , K. L. Giovanetti , F. X. Girod , C. Gleason , W. Gohn , E. Golovatch , R. W. Gothe , K. A. Griffioen , M. Guidal , L. Guo , K. Hafidi , H. Hakobyan , C. Hanretty , M. Hattawy , K. Hicks , M. Holtrop , Y. Ilieva , D. G. Ireland , B. S. Ishkhanov , E. L. Isupov , D. Jenkins , K. Joo , S. Joosten , C. D. Keith , D. Keller , G. Khachatryan , M. Khandaker , A. Kim , W. Kim , A. Klein , F. J. Klein , V. Kubarovsky , S. V. Kuleshov , L. Lanza , P. Lenisa , K. Livingston , H. Y. Lu , I. J. D. MacGregor , N. Markov , M. Mayer , M. E. McCracken , B. McKinnon , D. G. Meekins , C. A. Meyer , Z. E. Meziani , T. Mineeva , V. Mokeev , R. A. Montgomery , A. Movsisyan , C. Munoz Camacho , P. Nadel-Turonski , S. Niccolai , G. Niculescu , M. Osipenko , A. I. Ostrovidov , R. Paremuzyan , K. Park , E. Pasyuk , E. Phelps , W. Phelps , J. J. Pierce , O. Pogorelko , J. W. Price , S. Procureur , Y. Prok , D. Protopopescu , B. A. Raue , M. Ripani , D. Riser , B. G. Ritchie , A. Rizzo , G. Rosner , F. Sabatie , C. Salgado , R. A. Schumacher , Y. G. Sharabian , Iu. Skorodumina , G. D. Smith , D. I. Sober , D. Sokhan , N. Sparveris , S. Stepanyan , I. I. Strakovsky , S. Strauch , M. Taiuti , J. A. Tan , B. Torayev , M. Ungaro , E. Voutier , N. K. Walford , D. P. Watts , X. Wei , M. H. Wood , N. Zachariou , J. Zhang , Z. W. Zhao

Analysis of the partial wave structure of gamma p --> pi0 eta p reaction is presented in the energy region from threshold up to the total center of mass energy W = 1.9 GeV. Angular distributions measured with the Crystal Ball/TAPS hermetic…

Nuclear Experiment · Physics 2013-07-10 A. Fix , V. L. Kashevarov , M. Ostrick
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