Atomic parity violation and the HERA anomaly

Abstract

We show that the two scenarios able to explain the HERA anomaly --- a new leptoquark coupling or a new contact interaction --- predict new contributions to atomic parity violation. These corrections are sufficiently large and different that a feasible reduction in the dominant atomic theory uncertainty could give some hint in favour of one of the two scenarios.

Comments: 4 pages. Reference added, PDG value of weak charge revised