Elsevier

Nuclear Physics A

Volume 459, Issues 3–4, 10–17 November 1986, Pages 573-593
Nuclear Physics A

Observation of a narrow enhancement in the pp mass distribution from the reaction γd → ppπ

https://doi.org/10.1016/0375-9474(86)90161-2Get rights and content

Abstract

Studying the reaction γd → ppπ, a narrow resonance structure in the pp invariant mass distribution has been observed at 2014 ± 2 MeV/c2 with a statistical significance of 4.7 standard deviations. Using a bremsstrahlung photon beam (k0 = 520 MeV), the kinematics of the reaction were completely determined by detecting both outgoing protons in two large solid angle time-of-flight spectrometers. By accepting only proton momenta greater than ∼300 MeV/c, the predominant contribution from quasi-free pion production was suppressed.

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There are more references available in the full text version of this article.

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