Spin effects in the antler event topology at hadron colliders
Abstract
We investigate spin correlation effects in the "antler" event topology pp-> A-> B1, B2 -> l^{-}, C1, l^{+}, C2 at the LHC. We study the shapes of several kinematic variables, including the relative pseudorapidity, relative azimuthal angle and the energies of the two leptons, as well as several mass variables M_{ll}, Meff, \sqrt{s}_{min}, MT2, MCT and MCTx. We focus on the two kinematic extremes of \sqrt{s} - threshold and infinity - and derive analytical expressions for the differential distributions of several variables, most notably the cos{\theta_{ll}}^* variable proposed by Barr in hep-ph/0511115. For all possible spin assignments of particles A, B and C, we derive the cos{\theta_{ll}}^* differential distribution at threshold, including the effects of spin correlations. Our analytical results help identify the problematic cases for spin discrimination.
Keywords
Cite
@article{arxiv.1205.2054,
title = {Spin effects in the antler event topology at hadron colliders},
author = {Lisa Edelhäuser and Konstantin T. Matchev and Myeonghun Park},
journal= {arXiv preprint arXiv:1205.2054},
year = {2015}
}
Comments
43 pages, 14 figures, Preprint typeset in JHEP style