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We present analytic results for the finite-frequency current noise and thenonequilibrium ac conductance for a Kondo quantum dot in presence of a magneticfield. Using the real-time renormalization group method, we determine the lineshape close to resonances and show that while all resonances in the acconductance are broadened by the transverse spin relaxation rate, the noise atfinite field additionally involves the longitudinal rate as well as sharp kinksresulting in singular derivatives. Our results provide a consistent theoreticaldescription of recent experimental data for the emission noise at zero magneticfield, and we propose the extension to finite field for which we present adetailed prediction.

Magnetic field effects on the finite-frequency noise and ac conductance of a Kondo quantum dot out of equilibrium