BABAR is a High Energy Physics experiment located at the Stanford Linear Accelerator Center, near Stanford University, in California.

The goal of the experiment is to study the violation of charge and parity (CP) symmetry in the decays of B mesons. This violation manifests itself as different behaviour between particles and anti-particles and is the first step to explain the absence of anti-particles in everyday life.

To study CP violation the BABAR experiment exploits the 9.1 GeV electron beam and the 3 GeV positron beam of the PEP-II accelerator. The two beams collide in the center of the experiment, producing Y(4S) mesons which decay into equal numbers of B and anti-B mesons.

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