Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-08-02
JHEP 1011:122,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
Version to appear in JHEP
Scientific paper
10.1007/JHEP11(2010)122
We study methods for reconstructing the momenta of invisible particles in cascade decay chains at hadron colliders. We focus on scenarios, such as SUSY and UED, in which new physics particles are pair produced. Their subsequent decays lead to two decay chains ending with neutral stable particles escaping detection. Assuming that the masses of the decaying particles are already measured, we obtain the momenta by imposing the mass-shell constraints. Using this information, we develop techniques of determining spins of particles in theories beyond the standard model. Unlike the methods relying on Lorentz invariant variables, this method can be used to determine the spin of the particle which initiates the decay chain. We present two complementary ways of applying our method by using more inclusive variables relying on kinematic information from one decay chain, as well as constructing correlation variables based on the kinematics of both decay chains in the same event.
Cheng Hsin-Chia
Han Zhenyu
Kim Ian-Woo
Wang Lian-Tao
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