Singularities in the single lepton energy spectrum for precise measuring mass and spin of Dark Matter particles at the e^+e^- Linear Collider

Autor:	Ginzburg, Ilya F.
Rok vydání:	2012
Předmět:	High Energy Physics - Phenomenology High Energy Physics - Experiment
Druh dokumentu:	Working Paper
Popis:	We consider models in which stability of Dark Matter particles $D$ is ensured by the conservation of the new quantum number, called D-parity here. Our models contain also charged $D$-odd particle $D^\pm$. Here I propose the method for precision measuring masses and spin of $D$-particles via the study of energy distribution of single lepton ($e$ or $\mu$) in the process $\epe\to D^+D^-\to DDW^+W^-$ with the observable states {\it dijet + lepton} ($\mu$ or $e$) + {\it nothing}. To determine precisely masses of $D$ and $D^\pm$, it is sufficient to measure the singular points in the lepton energy distributions (upper edge and kinks or peak). After this, even a rough measuring of corresponding cross section allows to determine the spin of $D$ particles. This approach is free from the difficulties of a well-known methods of measuring the masses via the edges of the energy distribution of dijets, representing $W$, which obliged by inaccuracies in measuring the energies of individual jets. Comment: 6 pages, 3 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1211.2429 Zobrazit plný text záznamu View this record from Arxiv