| Issue |
EPJ Web of Conferences
Volume 72, 2014
International Symposium Lepton and Hadron Physics at Meson-Factories
|
|
|---|---|---|
| Article Number | 00016 | |
| Number of page(s) | 6 | |
| DOI | https://doi.org/10.1051/epjconf/20147200016 | |
| Published online | 06 May 2014 | |
https://doi.org/10.1051/epjconf/20147200016
Analysis of the η′ photoproduction off the proton and preliminary beam asymmetry results at the GRAAL experiment
1 Centro Siciliano di Fisica Nucleare e Struttura della Materia, viale Andrea Doria 6, I-95125 Catania, Italy
2 Dip. di Fisica e di Scienze della Terra, Università di Messina, salita Sperone 31, I-98166 Messina, Italy
3 INFN - Sezione di Catania, via Santa Sofia 64, I-95123 Catania, Italy
4 Dip. di Fisica - Università di Catania, via Santa Sofia 64, I-95123 Catania, Italy
5 LPSC, Université Grenoble-Alpes, CNRS/IN2P3, Grenoble IPN, F-38026 Grenoble, France
6 Dip. di Fisica - Università di Roma “Tor Vergata”, via della Ricerca Scientifica 1, I-00133 Roma, Italy
7 INFN - Sezione di Roma “Tor Vergata”, via della Ricerca Scientifica 1, I-00133 Roma, Italy
8 IN2P3, Institut de Physique Nucléaire, Rue Georges Clemenceau, F-91406 Orsay, France
9 Dip. di Fisica Sperimentale - Università di Torino, via Pietro Giuria 1, I-10125 Torino, Italy
10 INFN - Sezione di Torino, via Pietro Giuria 1, I-10125 Torino, Italy
11 Istituto Superiore di Sanità, viale Regina Elena 299, I-00161 Roma, Italy
12 INFN - Sezione di Roma, piazzale Aldo Moro 2, I-00185 Roma, Italy
13 Institute for Nuclear Research, 60-letiya Oktyabrya prospekt 7a, 117312 Moscow, Russia
14 INFN - Laboratori Nazionali di Frascati, via E. Fermi 40, I-00044 Frascati, Italy
a e-mail: gmandaglio@unime.it
b Present affiliation: ENEA - C.R. Casaccia Istituto Nazionale di Metrologia delle Radiazioni Ionizzanti Via Anguillarese, 301 I-00123 Roma, Italy
c Present affiliation: IPNL - 43, Bd du 11 Novembre 1918, Fr69622 Villeurbanne Cedex, France
d Present affiliation: Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife, Spain; Universidad de La Laguna, Dept. Astrofísica, E-38206 La Laguna, Tenerife, Spain
e Present affiliation: Physikalisches Institut - Bonn Universität, Nussallee 12, D-53115 Bonn, Deutschland
Published online: 6 May 2014
Differential and total cross section measurements on η′ photoproduction were published by the CLAS Collaboration (M. Dugger et al., Phys.Rev.Lett.96, 062001 (2006) and M. Williams et al., Phys.Rev.C80, 045213 (2009)) for center-of-mass energies from near the threshold up to 2.84 GeV, and by the CB-ELSA-TAPS Collaboration (V. Crede et al., Phys.Rev.C80, 055202 (2009)) up to 2.36 GeV and also making a precise threshold scan of the differential cross section in the 1446 – 1527.4 MeV γ beam energy range. However, the wide information about reaction cross sections are not sufficient to understand the role of resonances involved in the process. Different theoretical works stressed the importance to have also polarization observables in order to solve the ambiguity in the choice of the parameters used in their models. We present the analysis of the η′ photoproduction off the proton, identifying the meson via the γγ, π0π0η, and π+π−η decay modes by using the GRAAL apparatus; and we show the preliminary GRAAL results on the beam asymmetry Σ from the threshold (1.446 GeV) up to 1.5 GeV.
© Owned by the authors, published by EDP Sciences, 2014
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.