Beam Asymmetry Σ of the π- Photoproduction off Neutron

Beam Asymmetry Σ of the π- Photoproduction off Neutron

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We present the analysis of data performed in order to identify the events of the γ + n → π- + p reaction obtained by bombarding a liquid Deuterium target with a polarised γ beam of 0.55-1.5 GeV at the Graal-experiment. We show the effect of different kinematic and hardware constraints used to reduce the contamination coming from the concurrent reaction channels. By the simulation we estimate the contamination degree due to the other reaction channels so we can test the reliability of our method. We describe a new three-dimensional cut based on the Fermi momentum reconstruction and its effect on the suppression of the concurrent double charged pion photoproduction. We present the preliminary beam asymmetry Σ of the π- fotoproduction off quasi-free neutron up to about θc.m., π- = 165° together with some theoretical multipolar analysis. For a comparison we also report the data present in literature on the same reaction for Eγ =850-1740 MeV and θc.m., π- ≤105°.

G. Mandaglio, V. Bellini, J. P. Bocquet, L. Casano, A. D’Angelo, R. Di Salvo, A. Fantini, D. Franco, G. Gervino, F. Ghio, G. Giardina, B.  Girolami, A. Giusa, A. S. Ignatov, A. M. Lapik, P. Levi Sandri, A. Lleres, F. Mammoliti, M. Manganaro, D. Moricciani, A. N. Mushkarenkov, V. G. Nedorezov, C. Randieri, D. Rebreyend, N. V. Rudnev, G. Russo, C. Schaerf, M. L. Sperduto, M. C. Sutera, A. Turinge, V. Vegna (2010)

International Journal of Modern Physics E – June 2010, Vol. 19, Issues 5-6, pp. 965-976, doi: 10.1142/S0218301310015412.

World ScientificWorld Scientific Publishing Company was established in 1981 with only 5 employees in a tiny office. Today, the company employs more than 200 staff at its headquarters in Singapore and 450 globally. It has offices in New Jersey, London, Geneva, Hong Kong, Taipei, Beijing, Shanghai, Tianjin and Chennai. In about 3 decades, it has established itself as one of the leading scientific publishers in the world, and the largest international scientific publisher in the Asia-Pacific region. World Scientific publishes about 600 new titles a year and 130 journals in various fields.

Internation Journal of modern physics EThe International Journal of Modern Physics E covers the topics on experimental, theoretical and computational nuclear science, and its applications and interface with astrophysics and particle physics. The journal includes both review articles and research papers.

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