Bulk U(1) messenger

Abstract

We propose a new U(1) gauge interaction in the bulk in higher dimensional spacetime, which transmits supersymmetry-breaking effects on the hidden brane to the observable our brane. We find that rather small gauge coupling constant of U(1) bulk, α bulk≃5×10 −4, is required for a successful phenomenology. This result implies the compactification length L of the extra dimension to be L −1≃2×10 15 GeV for (4+1)-dimensional spacetime. This large compactification length L is a crucial ingredient to suppress unwanted flavor-changing neutral currents and hence our proposal is very consistent with the Randall–Sundrum brane-world scenario.