Measurement of the lifetime of <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msubsup><mrow><mi>K</mi></mrow><mrow><mi>S</mi></mrow><mrow><mn>0</mn></mrow></msubsup></mrow></math></span> mesons in the momentum range 100 to 350 GeV/<i>c</i>

N. Grossman; K. Heller; C. James; M. Shupe; K. Thorne; P. Border; M. J. Longo; A. Beretvas; A. Caracappa; T. Devlin; H. T. Diehl; U. Joshi; K. Krueger; P. C. Petersen; S. Teige; and G. B. Thomson

doi:10.1103/PhysRevLett.59.18

Measurement of the lifetime of $K_{S}^{0}$ mesons in the momentum range 100 to 350 GeV/c

N. Grossman, K. Heller, C. James, M. Shupe, K. Thorne, P. Border, M. J. Longo, A. Beretvas, A. Caracappa, T. Devlin, H. T. Diehl, U. Joshi, K. Krueger, P. C. Petersen, S. Teige, and and G. B. Thomson

Phys. Rev. Lett. 59, 18 – Published 6 July 1987

Abstract

In an experiment at Fermilab we have measured the lifetime of $K_{S}^{0}$ mesons produced by 800-GeV/c protons on tungsten. $K_{S}^{0}$ → $π^{+}$ $π^{-}$ decays from 100 to 350 GeV/c, between 9.3 and 25.3 m from production, were selected for the measurement. The result was (0.8920±0.0044)× $10^{- 10}$ sec, in excellent agreement with measurements performed for 2–5-GeV/c $K_{S}^{0}$ . The lifetime was also calculated for seven momentum bins. The results were completely consistent with Lorentz invariance. No evidence was found for the mometnum dependence suggested by the intermediate-range ‘‘fifth-force’’ hypothesis.