TL;DR
This paper reports a precise measurement of the K_S meson lifetime using data from the NA48 experiment, employing a ratio method to minimize systematic errors and achieve high accuracy.
Contribution
It introduces a measurement technique based on decay time ratios in simultaneous K_S and K_L beams, reducing systematic uncertainties compared to previous methods.
Findings
Measured K_S lifetime: (0.89598 ± 0.00048 ± 0.00051) x 10^(-10) s
Reduced systematic errors through decay time ratio method
High-precision lifetime value consistent with previous results
Abstract
A measurement of the K_S lifetime is presented using data recorded by the NA48 experiment at the CERN-SPS during 1998 and 1999. The K_S lifetime is derived from the ratio of decay time distributions in simultaneous, collinear K_S and K_L beams, giving a result which is approximately independent of the detector acceptance and with reduced systematic errors. The result obtained is tau_S=(0.89598 +- 0.00048 +- 0.00051)x10^(-10) s, where the first error is statistical and the second systematic.
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