Why is SUSY Breaking so Difficult?! - Institute for Particle Physics ...

R-symmetryWhat is it?It’s a global U(1) symmetry which doesn’t commute with thesupercharges:[Q, R ] = Q , [Q, R ] = −QDifferent components of chiral superfields carry different R-charge:Φ = φ + ψ θ + F θ 2 =⇒ R[θ] = 1 , R[dθ] = −1s s s−1 s−2And hence so does the superpotential:[∫ ]R d 2 θ W (Φ) = 0 =⇒ R[W ] = 2(I.P.P.P. — Durham University) SUSY Breaking Heidelberg 9 / 27