Measurement of beam asymmetry in photoproduction off the neutron in the second and third resonances region⋆

R. Di Salvo; A. Fantini; G. Mandaglio; F. Mammoliti; O. Bartalini; V. Bellini; J. P. Bocquet; L. Casano; A. D’angelo; J. P. Didelez; D. Franco; G. Gervino; F. Ghio; G. Giardina; B. Girolami; A. Giusa; M. Guidal; E. Hourany; R. Kunne; A. Lapik; P. Levi Sandri; A. Lleres; M. Manganaro; D. Moricciani; A. N. Mushkarenkov; V. Nedorezov; C. Randieri; D. Rebreyend; N. Rudnev; G. Russo; C. Schaerf; M. L. Sperduto; M. C. Sutera; A. Turinge; V. Vegna; A. Fix; S. S. Kamalov; L. Tiator

doi:10.1140/epja/i2009-10870-x

EPJ

Measurement of

beam asymmetry in

photoproduction off the neutron in the second and third resonances region^⋆

R. Di Salvo¹, A. Fantini¹^,10, G. Mandaglio²^,14, F. Mammoliti²^,11, O. Bartalini³^,10, V. Bellini⁴^,11, J. P. Bocquet⁵, L. Casano¹, A. D’angelo¹^,10, J. P. Didelez⁶, D. Franco¹^,10, G. Gervino⁷^,12, F. Ghio⁸^,13, G. Giardina²^,14, B. Girolami⁸^,13, A. Giusa²^,11, M. Guidal⁶, E. Hourany⁶, R. Kunne⁶, A. Lapik⁹, P. Levi Sandri³^*, A. Lleres⁵, M. Manganaro²^,14, D. Moricciani¹, A. N. Mushkarenkov⁹, V. Nedorezov⁹, C. Randieri³^,11, D. Rebreyend⁵, N. Rudnev⁹, G. Russo²^,11, C. Schaerf¹^,10, M. L. Sperduto²^,11, M. C. Sutera², A. Turinge⁹, V. Vegna¹^,10, A. Fix¹⁵, S. S. Kamalov¹⁶^,17 and L. Tiator¹⁶

¹ INFN - Sezione di Roma “Tor Vergata”, via della Ricerca Scientifica 1, I-00133, Roma, Italy
² INFN - Sezione di Catania, via Santa Sofia 64, I-95123, Catania, Italy
³ INFN - Laboratori Nazionali di Frascati, via Enrico Fermi 40, I-00044, Frascati, Italy
⁴ INFN - Laboratori Nazionali del Sud, via Santa Sofia 64, I-95123, Catania, Italy
⁵ Institut National Polytechnique de Grenoble, LPSC, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, 53 Avenue des Martyrs, 38026, Grenoble, France
⁶ IPNO, Université de Paris-Sud 11, CNRS/IN2P3, 15 rue Georges Clémenceau, 91406, Orsay, France
⁷ INFN - Sezione di Torino, via P. Giuria, I-10125, Torino, Italy
⁸ INFN - Sezione di Roma, piazzale Aldo Moro 2, I-00185, Roma, Italy
⁹ Institute for Nuclear Research, 117312, Moscow, Russia
¹⁰ Dipartimento di Fisica, Università di Roma “Tor Vergata”, via della Ricerca Scientifica 1, I-00133, Roma, Italy
¹¹ Dipartimento di Fisica e Astronomia, Università di Catania, via Santa Sofia 64, I-95123, Catania, Italy
¹² Università di Torino, via P. Giuria, I-00125, Torino, Italy
¹³ Istituto Superiore di Sanità, viale Regina Elena 299, I-00161, Roma, Italy
¹⁴ Dipartimento di Fisica, Università di Messina, salita Sperone 31, I-98166, Messina, Italy
¹⁵ Laboratory of Mathematical Physics, Tomsk Polytechnic University, 634050, Tomsk, Russia
¹⁶ Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, D-55099, Mainz, Germany
¹⁷ Laboratory of Theoretical Physics, JINR Dubna, 141980, Moscow region, Russia

Received: 21 April 2009
Revised: 27 August 2009
Accepted: 3 September 2009
Published online: 4 October 2009

Abstract

The

beam asymmetry in the photoproduction of neutral pions from quasi-free nucleons in a deuteron target was measured for the first time between 0.60 and 1.50GeV, with the GRAAL polarized and tagged photon beam. The asymmetry values from the quasi-free proton were found equal to the ones extracted from a pure proton target. The asymmetries from quasi-free proton and quasi-free neutron were found equal up to 0.82GeV and substantially different at higher energies. The results are compared with recent partial-wave analyses.

PACS: 13.60.Le Meson production – / 13.88.+e Polarization in interactions and scattering – / 25.20.Lj Photoproduction reactions –

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EPJ

Measurement of beam asymmetry in photoproduction off the neutron in the second and third resonances region⋆

Conference announcements

Measurement of beam asymmetry in photoproduction off the neutron in the second and third resonances region^⋆