Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-12-22
Eur.Phys.J.C51:753-774,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
39 pages, 14 figures
Scientific paper
10.1140/epjc/s10052-007-0367-7
The spin of supersymmetric particles can be determined at $e^+e^-$ colliders unambiguously. This is demonstrated for a characteristic set of non-colored supersymmetric particles -- smuons, selectrons, and charginos/neutralinos. The analysis is based on the threshold behavior of the excitation curves for pair production in $e^+e^-$ collisions, the angular distribution in the production process and decay angular distributions. In the first step we present the observables in the helicity formalism for the supersymmetric particles. Subsequently we confront the results with corresponding analyses of Kaluza-Klein particles in theories of universal extra space dimensions which behave distinctly different from supersymmetric theories. It is shown in the third step that a set of observables can be designed which signal the spin of supersymmetric particles unambiguously without any model assumptions. Finally in the fourth step it is demonstrated that the determination of the spin of supersymmetric particles can be performed experimentally in practice at an $e^+e^-$ collider.
Choi Yong-Sang
Hagiwara Kaoru
Martyn Hans-Ulrich
Mawatari Kentarou
Zerwas Peter M.
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