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Recently OPERA announced that neutrinos have been found to
travel with a speed higher than the speed of light and subsequently
withdrawn their result, but this has renewed interest in the faster-than-light
particles. In this talk I shall discuss certain conceptual issues associated
with the faster-than-light particles and point out that although they have
not been discovered yet, their existence is inevitable in many theories.
We then explain how the faster than light scalar particles are associated
with the Higgs mechanism to give fermion masses, while the superluminal
fermions require violation of Lorentz invariance or violation of equivalence
principle, for which the phenomenological constraints are very stringent,
including our pion decay constraints that proved the OPERA experiment
inconsistent theoretically.
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