Bulk U(1) messenger

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, αbulk≃5×10−4, is required for a successful phenomenology. This result implies the compactification length L of the extra dimension to be L−1≃2×1015 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.