Probing the two-neutrino exchange force using atomic parity violation

Understand

The exchange of two neutrinos at one loop leads to a long-range parity-violating force between fermions.

• We explore the two-neutrino force in the backdrop of atomic physics.
• We point out that this is the largest parity-violating long-range force in the Standard Model and calculate the effect of this force in experiments that probe atomic parity violation by measuring optical rotation of light as it passes through a sample of vaporized atoms.
• We perform explicit calculations for the hydrogen atom to demonstrate this effect.