pi-mesonn.
/ˌpʌɪˈmiːzɒn/, /ˌpʌɪˈmɛzɒn/, U.S. /ˌpaɪˈmiˌzɑn/, /ˌpaɪˈmɛˌzɑn/; see also meson n.3 Particle Physics.
= pion n. Cf. mu-meson n.This was the original name for the particle.In contrast to muons, pions are still classed as mesons; cf. muon n.
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pi-meson1947
pion1951
1947 C. M. G. Lattes et al. in Nature 4 Oct. 455/1 It is convenient to refer to this process..as the μ-decay. We represent the primary mesons by the symbol π, and the secondary by μ.]
1947 C. M. G. Lattes et al. in Nature 4 Oct. 456/1 The restricted range of the π-mesons in the emulsion.
1950 D. Halliday Introd. Nucl. Physics xii. 455 When negative pi-mesons are absorbed in matter,..there is a major nuclear disruption.
1972 Daily Colonist (Victoria, Brit. Columbia) 3 Mar. 16/8 The new technique involves a radioactive beam of sub-atomic particles called pimesons.
1983 New Scientist 24 Feb. 520/1 The photon quickly materialises as a quark and an antiquark, which turn into showers of observable particles such as protons and pi-mesons.
1990 R. Morris Edges of Sci. i. i. 9 Some of the mesons, such as the pi meson.., or pion, were relatively light... Other mesons, on the other hand, were quite heavy.
This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022).
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n.1947