Latest results from GRAAL collaboration

摘要：

The GRAAL experimental set-up consists of a polarized and tagged photon beam that covers an energy range from a minimum of 600 MeV up to a maximum of 1500 MeV, of a liquid Hydrogen or Deuterium target and of the 4π Lagrange detector optimized for photon detection. It allows the study of pseudo-scalar and vector meson photoproduction on the nucleon in the energy range corresponding to the second and the third resonance regions. In the following, the Σ beam asymmetries in η and π~0 photoproduction on quasi-free nucleon are shown. Also single and double polarization observables in K~+A photoproduction on free proton are shown; they are important to confirm the role of new or poorly known resonances in the 1900 MeV mass region.

关键词： polarized photon meson photoproduction polarization observables

作者: V.Vegna G.Gervino F.Ghio G.Giardina B.Girolami A.Giusa M.Guidal E.Hourany A.S.Ignatov R.Kunnel A.Lapik V.Bellini A.Lleres P.Levi Sandri F.Mammoliti G.Mandaglio M.Manganaro M.Moricciani A.N.Mushkarenkov V.G.Nedorezov C.Randieri D.Rebreyend J.P.Bouquet N.V.Rudnev G.Russo C.Schaerf M.L.Sperduto M.C.Sutera A.Turinge L.Casano A.DAngelo J.P.Didelez R.Di Salvo A.Fantini D.Franco

作者单位: Dip.di Fisica,Universita degli Studi di Roma Tor Vergata,via della Ricerca Scientifica 1,I-00133 R Dip.di Fisica Sperimentale,Universita di Torino,via P.Giuria,I-00125 Torino,Italy;INFN-Sezione di To Istituto Superiore di Sanita.,viale Regina Elena 299,I-00161 Roma,Italy;INFN-Sezione di Roma,piazzal Dip.di Fisica,Universita di Messina,salita Sperone 31,I-98166 Messina,Italy;INFN-Sezione di Catania, Dip.di Fisica e Astronomia,Universita di Catania,via Santa Sofia 44,1-95123 Catania,Italy IPNO,Universite de Paris-Sud 11,CNRS/IN2P3,15 rue Georges Clemenceau,91406 Orsay,France Institute for Nuclear Research,RAS,117312 Moscow,Russia Dip.di Fisica e Astronomia,Universita di Catania,via Santa Sofia 44,1-95123 Catania,Italy;INFN-Sezio LPSC,Universite Joseph Fourier Grenoble 1,CNRS/IN2P3,Institut National Polytechnique de Grenoble,53 INFN-Laboratori Nazionali di Frascati,via E.Fermi 40,I-00044 Frascati,Italy INFN-Sezione di Roma Tor Vergata,via della Ricerca Scientifica 1,I-00133 Roma,Italy

会议类型: 国际会议

会议名称: The 12th International Workshop on the Physics of Ezcited Nucleon NSTAR2009(2009激发态核子物理研讨会)

会议地点: 北京

会议语种:英文

页码: 1249-1253

在线出版日期: 2009-04-19（万方平台首次上网日期，不代表论文的发表时间）