Measurement of the lifetimes of π+ and K+ mesons
Koptev V. P. , Mikirtych'yants S. M. , Shcherbakov G. V. , Abrosimov N. K. , Volchenkov V. A. , Barsov S. G. , Getalov A. L., Eliseev V. A. , Ivanov E. M. , Kruglov S. P., Malov Yu. A., Orishchin E. M., Ryabov G. A. , Uvarov L. N. , Shevel' L. F.
Precise measurements of the lifetimes of 77+ and K+ mesons have been carried out. The new measurement method makes use of a periodic temporal microstructure of a beam of protons which are interacting with the target. Positive muons from the decay of тг+ and K+ mesons produced and stopped in the target are detected. The values found are τπ+ = 26.0361 ±0.0052 ns and rK+ = 12.415±0.024 ns. © 1995