https://doi.org/10.1140/epja/i2006-10272-8
QNP 2006
Meson photoproduction on the nucleon with polarized photons
1
Dipartimento di Fisica ed Astronomia, Università di Catania, Via Santa Sofia 64, I-95123, Catania, Italy
2
Dipartimento di Fisica, Università di Messina, Salita Sperone 31, I-98166, Messina, Italy
3
Dipartimento di Fisica, Università di Roma “Tor Vergata”, Via della Ricerca Scientifica 1, I-00133, Roma, Italy
4
Dipartimento di Fisica Sperimentale, Università di Torino, Via P. Giuria, I-00125, Torino, Italy
5
Laboratori Nazionali di Frascati, INFN, Via E. Fermi 40, I-00044, Frascati, Italy
6
Laboratori Nazionali del Sud, INFN, Via di Santa Sofia 44, I-95123, Catania, Italy
7
Sezione di Catania, INFN, Via Santa Sofia 44, I-95123, Catania, Italy
8
Sezione di Genova, INFN, Via Dodecanneso 33, I-16146, Genova, Italy
9
Sezione di Roma, INFN, Piazzale Aldo Moro 2, I-00185, Roma, Italy
10
Sezione di Roma “Tor Vergata”, INFN, Via della Ricerca Scientifica 1, I-00133, Roma, Italy
11
Sezione di Torino, INFN, I-10125, Torino, Italy
12
Istituto Superiore di Sanità, Viale Regina Elena 299, I-00161, Roma, Italy
13
Laboratoire de Physique Subatomique et de Cosmologie, IN2P3, 38026, Grenoble, France
14
Institute for Nuclear Research, 117312, Moscow, Russia
15
Institut de Physique Nucléaire, IN2P3, 91406, Orsay, France
* e-mail: annalisa.dangelo@roma2.infn.it
Received:
8
December
2006
Accepted:
15
December
2006
Published online:
20
March
2007
Meson photoproduction with polarized photons has proved to be a powerful tool to identify contributions of baryon resonances that are not evident in the differential cross-sections. It provides information that are complementary to those extracted using pion-nucleon scattering data. Extensive results have been produced in the past on beam asymmetries by the Graal collaboration for η and π 0 on the proton. New results are now available for the same reactions on the quasi-free neutron and for the K+ photoproduction on the proton. Contributions from hitherto undetected baryon resonances may be important to understand the results.
PACS: 13.60.Le Meson production – / 13.88.+e Polarization in interactions and scattering – / 25.20.Lj Photoproduction reactions –
© Società Italiana di Fisica and Springer-Verlag, 2007