Experiments in relativistic
kinematics: the universal speed limit and time
dilation. The existence of an absolute limit,
c, on the speed of particles is demonstrated by
a measurement of the times of flight of cosmicray
muons between scintillation counters in the laboratory.
The mean life of muons at rest is then determined
from a measurement of the distribution of radioactive
decay times of muons that stop in a large plastic
scintillator.
Given their measured short mean
life, the measured speed limit, and the large
distance they travel from their places of production
high in the atmosphere, it is apparent that the
muons in flight live much longer relative to an
observer in the laboratory than muons at rest,
in conformance with the predictions of relativistic
kinematics.
Student Wiki: CosmicRay Muons
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 [1948] B. Rossi, Interpretation of CosmicRay Phenomena Reviews of Modern Physics, Vol. 20, Number 3, July, 1948
 B. Rossi, HighEnergy Particles (PrenticeHall, New York, 1952) Chapter 1, pp. 19.
 B. Rossi, HighEnergy Particles (PrenticeHall, New York, 1952) Chapter
2: "Theory of Electromagnetic Interactions," pp. 1089.
 B. Rossi, HighEnergy Particles (PrenticeHall, New York, 1952) Chapter 3: "Experimental Methods," pp. 90145.
 B. Rossi, HighEnergy Particles (PrenticeHall, New York, 1952) Chapter 4: "Elementary Particles," pp. 146213.
 B. Rossi, HighEnergy Particles (PrenticeHall, New York, 1952) Chapter 5: "Cosmic Showers," pp. 214297.
 B. Rossi, HighEnergy Particles (PrenticeHall, New York, 1952) Chapter 6: "Experimental Results on the Electromagnetic Interactions of HighEnergy Particles in Cosmic Rays and from Artificial Source,"s pp. 299341.
 B. Rossi, HighEnergy Particles (PrenticeHall, New York, 1952) Chapter 7: "Nuclear Interactions of HighEnergy Particles from Artificial Sources," pp. 342387.
 B. Rossi, HighEnergy Particles (PrenticeHall, New York, 1952) Chapter 8: "Nuclear Interactions of CosmicRays" Part I, pp. 388465.
 B. Rossi, HighEnergy Particles (PrenticeHall, New York, 1952) Chapter 8: "Nuclear Interactions of CosmicRays" Part II, pp. 466525.
 B. Rossi, High Energy Particles (PrenticeHall, New York, 1952) Appendices, Bibliography and Index, pp. 527569.
 [1963] D.H. Frisch and J.H. Smith Measurement of the Relativistic Time Dilation Using muMesons American Journal of Physics, Vol. 31, pp. 342355, 1963
 B. Rossi, Cosmic Rays (McGrawHill, New York, 1964).
 [1970] R.E. Hall, D.A. Lind and R.A. Ristinen A Simplified Muon Lifetime Experiment for the Instructional Laboratory American Journal of Physics, Vol. 38, Number 10, October, 1970
 D. Griffiths, Introduction to Elementary Particles (Wiley, New York, 1987), Chapter 1, pp. 151.
 D. Griffiths, Introduction to Elementary Particles (Wiley, New York, 1987), Chapter 10: "Theory of Weak Interactions and Muon Decay," pp. 301309
 D.H. Perkins, Introduction to High Energy Physics (Cambridge University Press, Cambridge, 2000) p. 213; A nice comparison positon spectra from muon (three body) and pion (two body decays)
 Standford Linear Accelerator High Energy Cosmic Rays: A very nice overview of current cosmic ray research.
