Answer
The Nobel-winning experiment that confirmed the existence of the W and Z bosons, the particles that mediate the weak nuclear force, was conducted at Brookhaven National Laboratory in Upton, New York. The experiment, led by physicist Val Fitch and his team, utilized the Alternating Gradient Synchrotron (AGS) to collide protons with a stationary target, resulting in the production and subsequent detection of these elusive particles.