Pion pair production in photon-photon collisions at DCI |
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| Institution: | 1. Department of Economics, Simon Fraser University, 8888 University Drive, Burnaby, BA V5A1S6, BC Canada;2. Department of Human Evolutionary Biology MCZ 533C, Harvard University, 11 Divinity Avenue, Cambridge, MA 02318, USA;3. Smith Institute for Political Economy and Philosophy, Chapman University, One University Drive, Orange, CA 92866, USA;2. Medicinal Inorganic Chemistry Group, Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada |
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| Abstract: | This paper presents experimental results on π+π− production threshold from the collision of quasi-real photons. The data, obtained at the e+e− collider DCI, are a combination of the results from the DM1 and DM2 experiments. Using the e+e− and π+π− production for normalization and cross-checks, we observe a pion pair yield at low invariant mass (W < 500 MeV/c2) which is approximately twice the one expected from Born terms. |
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