$f$ , $f^{'}$ , and $A_{2}^{0}$ Interference in $π N \to K^{-} K^{+} N$ at 6 GeV/c

Publisher Website

11 October 1976

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 37 (15) , 971-973
https://doi.org/10.1103/physrevlett.37.971

Abstract

The Argonne effective mass spectrometer has been used for a high-statistics study of

π^{-} + p \to K^{-} + K^{+} + n (110000 events)

and

π^{+} + n \to K^{-} + K^{+} + p (50000 events)

at 6 GeV/c. Comparison of the two reactions allows isolation of the interference between

K^{-} K^{+}

states of differing isospin. We observe

f - A_{2}^{0}

,

f^{'} - A_{2}^{0}

, and

f - f^{'}

interferences in the

Y_{4}^{0}

moment and find

f^{'}

production to have a substantial contribution from some mechanism besides pion exchange. New values for the

f^{'}

mass, width, and branching ratio into

π π

are presented.

Keywords

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