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    O. Hen ; M. Sargsian ; L. B. Weinstein ; E. Piasetzky ; H. Hakobyan ; D. W. Higinbotham ; M. Braverman ; W. K. Brooks ; S. Gilad ; K. P. Adhikari ; J. Arrington ; G. Asryan ; H. Avakian ; J. Ball ; N. A. Baltzell ; M. Battaglieri ; A. Beck ; S. May-Tal Beck ; I. Bedlinskiy ; W. Bertozzi ; A. Biselli ; V. D. Burkert ; T. Cao ; D. S. Carman ; A. Celentano ; S. Chandavar ; L. Colaneri ; P. L. Cole ; V. Crede ; A. D'Angelo ; R. De Vita ; A. Deur ; C. Djalali ; D. Doughty ; M. Dugger ; R. Dupre ; H. Egiyan ; A. El Alaoui ; L. El Fassi ; L. Elouadrhiri ; G. Fedotov ; S. Fegan ; T. Forest ; B. Garillon ; M. Garcon ; N. Gevorgyan ; Y. Ghandilyan ; G. P. Gilfoyle ; F. X. Girod ; J. T. Goetz ; R. W. Gothe ; K. A. Griffioen ; M. Guidal ; L. Guo ; K. Hafidi ; C. Hanretty ; M. Hattawy ; K. Hicks ; M. Holtrop ; C. E. Hyde ; Y. Ilieva ; D. G. Ireland ; B. I. Ishkanov ; E. L. Isupov ; H. Jiang ; H. S. Jo ; K. Joo ; D. Keller ; M. Khandaker ; A. Kim ; W. Kim ; F. J. Klein ; S. Koirala ; I. Korover ; S. E. Kuhn ; V. Kubarovsky ; P. Lenisa ; W. I. Levine ; K. Livingston ; M. Lowry ; H. Y. Lu ; I. J. MacGregor ; N. Markov ; M. Mayer ; B. McKinnon ; T. Mineeva ; V. Mokeev ; A. Movsisyan ; C. Munoz Camacho ; B. Mustapha ; P. Nadel-Turonski ; S. Niccolai ; G. Niculescu ; I. Niculescu ; M. Osipenko ; L. L. Pappalardo ; R. Paremuzyan ; K. Park ; E. Pasyuk ; W. Phelps ; S. Pisano ; O. Pogorelko ; J. W. Price ; S. Procureur ; Y. Prok ; D. Protopopescu ; A. J. Puckett ; D. Rimal ; M. Ripani ; B. G. Ritchie ; A. Rizzo ; G. Rosner ; P. Roy ; P. Rossi ; F. Sabatie ; D. Schott ; R. A. Schumacher ; Y. G. Sharabian ; G. D. Smith ; R. Shneor ; D. Sokhan ; S. S. Stepanyan ; S. Stepanyan ; P. Stoler ; S. Strauch ; V. Sytnik ; M. Taiuti ; S. Tkachenko ; M. Ungaro ; A. V. Vlassov ; E. Voutier ; N. K. Walford ; X. Wei ; M. H. Wood ; S. A. Wood ; N. Zachariou ; L. Zana ; Z. W. Zhao ; X. Zheng ; I. Zonta
    American Association for the Advancement of Science (AAAS)
    Published 2014
    Staff View
    Publication Date:
    2014-10-18
    Publisher:
    American Association for the Advancement of Science (AAAS)
    Print ISSN:
    0036-8075
    Electronic ISSN:
    1095-9203
    Topics:
    Biology
    Chemistry and Pharmacology
    Computer Science
    Medicine
    Natural Sciences in General
    Physics
    Published by:
    http://www.aaas.org/

    Latest Papers from Table of Contents or Articles in Press
  2. 2
    Staff View
    ISSN:
    1434-601X
    Keywords:
    12.38.Qk Experimental tests ; 13.40.-f Electromagnetic processes and properties ; 13.60.Le Meson production
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract. An experiment on the radiative π{+}-meson photoproduction from the proton ( γp → γπ{+}n) was carried out at the Mainz Microtron MAMI in the kinematic region 537MeV 〈 Eγ 〈 817MeV, 140°≤ $ \theta_{{\gamma \gamma ^{\prime }}}^{{{{\rm cm}}}}$ ≤180°. The π{+}-meson polarizabilities have been determined from a comparison of the data with the predictions of two different theoretical models, the first one being based on an effective pole model with pseudoscalar coupling while the second one is based on diagrams describing both resonant and nonresonant contributions. The validity of the models has been verified by comparing the predictions with the present experimental data in the kinematic region where the pion polarizability contribution is negligible ( s1 〈 5mπ2) and where the difference between the predictions of the two models does not exceed 3%. In the region, where the pion polarizability contribution is substantial ( 5 〈 s1/mπ2 〈 15, -12 〈 t/mπ2 〈 - 2), the difference $\ensuremath{(\alpha -\beta )_{\pi^{+}}}$ of the electric (α) and the magnetic (β) polarizabilities has been determined. As a result we find $\ensuremath{(\alpha -\beta )_{\pi^{+}}=(11.6\pm 1.5_{{\rm stat}}\pm 3.0_{{\rm syst}}\pm 0.5_{{\rm mod}})\times 10^{-4}{}{\rm fm^{3}}}$ . This result is at variance with recent calculations in the framework of chiral perturbation theory.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1140/epja/i2004-10056-2

    Articles: DFG German National Licenses