Addendum to "Distinguishing Spins in Decay Chains at the Large Hadron Collider"

Athanasiou, Christiana; Lester, Christopher G.; Smillie, Jennifer M.; Webber, Bryan R.

Addendum to "Distinguishing Spins in Decay Chains at the Large Hadron Collider"

Authors

Athanasiou, Christiana

Lester, Christopher G.

Smillie, Jennifer M.

Webber, Bryan R.

Description

We extend our earlier study of spin correlations in the decay chain $D\to C q$, $C\to B l^{near}$, $B\to A l^{far}$, where $A,B,C,D$ are new particles with known masses but undetermined spins, $l^{near}$ and $l^{far}$ are opposite-sign same-flavour charged leptons and $A$ is invisible. Instead of looking at the observable 2- and 3-particle invariant mass distributions separately, we compare the full three-dimensional phase space distributions for all possible spin assignments of the new particles, and show that this enhances their distinguishability using a quantitative measure known as the Kullback-Leibler distance.
5 pages, no figures