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Upper limit on the decay Σ(1385)→Σγ and cross section for γΣ→Λπ |
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| Affiliation: | a Ball State University, Muncie, IN 47306, USA b Bogazici University, Bebek 80815, Istanbul, Turkey c Carnegie Mellon University, Pittsburgh, PA 15213, USA d Centro Brasileiro de Pesquisas Físicas, Rio de Janeiro, Brazil e Fermi National Accelerator Laboratory, Batavia, IL 60510, USA f Institute for High Energy Physics, Protvino, Russia g Institute of High Energy Physics, Beijing, PR, China h Institute of Theoretical and Experimental Physics, Moscow, Russia i Max-Planck-Institut für Kernphysik, 69117, Heidelberg, Germany j Moscow State University, Moscow, Russia k Petersburg Nuclear Physics Institute, St. Petersburg, Russia l Tel Aviv University, 69978 Ramat Aviv, Israel m Universidad Autónoma de San Luis Potosí, San Luis Potosí, Mexico n Universidade Federal da Paraíba, Paraíba, Brazil o University of Bristol, Bristol BS8 1TL, United Kingdom p University of Iowa, Iowa City, IA 52242, USA q University of Michigan-Flint, Flint, MI 48502, USA r University of Rochester, Rochester, NY 14627, USA s University of Rome “La Sapienza” and INFN, Rome, Italy t University of São Paulo, São Paulo, Brazil u University of Trieste and INFN, Trieste, Italy |
| Abstract: | Coherent Λπ− production on Pb of 600 GeV Σ− hyperons has been studied with the SELEX facility at Fermilab. Using the Primakoff formalism, we set a 90% CL upper limit on the radiative decay width Γ[Σ(1385)−→Σ−γ]<9.5 keV, and estimate the cross section for γΣ−→Λπ− at GeV to be 56±16 μb. |
| Keywords: | Hyperon radiative decay Primakoff effect |
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