In
high energy physics
Particle physics or high energy physics is the study of fundamental particles and forces that constitute matter and radiation. The fundamental particles in the universe are classified in the Standard Model as fermions (matter particles) and b ...
, event shapes observables are quantities used to characterize the geometry of the outcome of a collision between
high energy particles
Particle physics or high energy physics is the study of fundamental particles and forces that constitute matter and radiation. The fundamental particles in the universe are classified in the Standard Model as fermions (matter particles) and ...
in a
collider
A collider is a type of particle accelerator which brings two opposing particle beams together such that the particles collide. Colliders may either be ring accelerators or linear accelerators.
Colliders are used as a research tool in particle ...
. Specifically, event shapes observables quantify the general pattern traced by the trajectories of the particles resulting from the collision.
[V. D. Barger, R. J. N. Phillips (1997) “Collider Physics” Frontier in Physics, Addison-Wesley Publishing Company, Inc.][M. Dasgupta and G. P. Salam (2004)]
Event shapes in e+ e- annihilation and deep inelastic scattering
J. Phys. G 30, R143
preprint
The most common event shape observables include:
*The sphericity;
*The aplanarity;
*The
thrust
Thrust is a reaction force
In physics, a force is an influence that can change the motion of an object. A force can cause an object with mass to change its velocity (e.g. moving from a state of rest), i.e., to accelerate. Force can al ...
.
*The C-parameter;
*The jet broadening.
References
Experimental particle physics
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