Who is the luckiest physicist ever? Why?

 It's subjective to determine the "luckiest" physicist ever, as luck is not typically a criterion used to evaluate scientific contributions. However, one physicist often associated with luck is Paul Dirac.

Paul Dirac was a brilliant theoretical physicist who made significant contributions to quantum mechanics and quantum electrodynamics. He was awarded the Nobel Prize in Physics in 1933, at the age of 31, jointly with Erwin Schrödinger. Dirac's work laid the foundation for the development of quantum field theory.

The story goes that Dirac's equations, particularly the Dirac equation describing the behavior of electrons, predicted the existence of antimatter. At the time, this prediction seemed almost too abstract and unlikely. However, experimental evidence later confirmed the existence of antimatter, and this discovery earned Dirac significant acclaim.

Whether one considers this a stroke of luck or the result of his profound insights and mathematical intuition is open to interpretation. Nevertheless, Dirac is often remembered for his groundbreaking contributions to physics.