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Journal articles
Measurement of the $\Sigma$ beam asymmetry for the $\omega$ photo-production off the proton and the neutron at GRAAL
V. Vegna
A. d'Angelo
O. Bartalini
V. Bellini
J.P. Boquet
1
M. Capogni
L. E. Casano
M. Castoldi
F. Curciarello
V. de Leo
J. P. Didelez
2
R. Di Salvo
A. Fantini
D. Franco
G. Gervino
F. Ghio
G. Giardina
B. Girolami
A. Giusa
A. Lapik
P. Levi Sandri
A. Lleres
1
F. Mammoliti
G. Mandaglio
M. Manganaro
D. Moricciani
A. Mushkarenkov
V. Nedorezov
C. Randieri
D. Rebreyend
1
N. Rudnev
G. Russo
C. Schaerf
M. L. Sperduto
M. C. Sutera
A. Turinge
I. Zonta
I. Zonta
Author
1
LPSC - Laboratoire de Physique Subatomique et de Cosmologie (53 avenue des Martyrs - 38026 Grenoble Cedex - France)
- Grenoble INP - Institut polytechnique de Grenoble - Grenoble Institute of Technology (46 avenue Félix Viallet 38031 Grenoble Cedex 1 - France)
- Institut Polytechnique de Grenoble - Grenoble Institute of Technology (France)
- IN2P3 - Institut National de Physique Nucléaire et de Physique des Particules du CNRS (France)
- UJF - Université Joseph Fourier - Grenoble 1 (BP 53 - 38041 Grenoble Cedex 9 - France)
- CNRS - Centre National de la Recherche Scientifique : UMR5821 (France)
2
IPNO - Institut de Physique Nucléaire d'Orsay (IPN - 15, rue Georges Clemenceau - 91406 ORSAY CEDEX - France)
- CNRS - Centre National de la Recherche Scientifique : UMR8608 (France)
- IN2P3 - Institut National de Physique Nucléaire et de Physique des Particules du CNRS (France)
- UP11 - Université Paris-Sud - Paris 11 (Bâtiment 300 - 91405 Orsay cedex - France)
Abstract : We report on new measurements of the beam asymmetry for \omega\ photo-production on proton and neutron in Hydrogen and Deuterium targets from the GRAAL collaboration. The beam asymmetry values are extracted from the reaction threshold (E_{\gamma} = 1.1 GeV in the free nucleon kinematics) up to 1.5 GeV of incoming photon energy. For the first time both the radiative and the three-pion decay channels are simultaneously investigated on the free proton. Results from the two decay channels are in agreement and provide important constraints for the determination of resonant state contributions to the \omega\ production mechanism. First experimental results on the deuteron allow the extraction of the \Sigma\ beam asymmetry on quasi-free nucleons. Comparison of the results for free and quasi-free kinematics on the proton shows a generally reasonable agreement, similar to the findings in pseudo-scalar meson photo-production reactions. For the first time measurements on quasi-free neutrons are available, showing that both the strength and the angular distributions of the beam asymmetry are sensibly different from the results on the proton target.
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http://hal.in2p3.fr/in2p3-00838545
Contributor : Emmanuelle Vernay <>
Submitted on : Wednesday, June 26, 2013 - 8:29:07 AM
Last modification on : Friday, April 30, 2021 - 10:24:09 AM
Contributor : Emmanuelle Vernay <>
Submitted on : Wednesday, June 26, 2013 - 8:29:07 AM
Last modification on : Friday, April 30, 2021 - 10:24:09 AM
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- HAL Id : in2p3-00838545, version 1
- ARXIV : 1306.5943
- DOI : 10.1103/PhysRevC.91.065207
Citation
V. Vegna, A. d'Angelo, O. Bartalini, V. Bellini, J.P. Boquet, et al.. Measurement of the $\Sigma$ beam asymmetry for the $\omega$ photo-production off the proton and the neutron at GRAAL. Physical Review C, American Physical Society, 2015, 91, pp.065207. ⟨10.1103/PhysRevC.91.065207⟩. ⟨in2p3-00838545⟩
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