Polarization of top produced in particle decays in an arbitrary frame

Understand

In most of the models beyond the Standard Model, the top quark is expected to be polarized when produced in the decay of some heavier particle, like the gluino or the stop.

• The polarization is constructed, in an experiment or in simulations, through the distribution of top decay products.
• Here, we propose an estimator of top quark polarization that depends only on the kinematics of it's mother particle, apart from its decay couplings to top quarks, and is given in terms of the top polarization expected in the rest frame of the decaying particle.
• This estimator allows one to estimate the top polarization without performing a full simulation.