Event shape observables

In high energy physics, event shapes observables are quantities used to characterize the geometry of the outcome of a collision between high energy particles in a collider. Specifically, event shapes observables quantify the general pattern traced by the trajectories of the particles resulting from the collision.

The most common event shape observables include:


 * The sphericity;


 * The aplanarity;


 * The thrust.


 * The C-parameter;


 * The jet broadening.