Measuring superparticle masses at hadron collider using the transverse mass kink

Abstract

We present a detailed study of the collider observable $m_{T2}$ applied for pair-produced superparticles decaying to visible particles and a pair of invisible lightest supersymmetric particles (LSPs). Analytic expressions of the maximum of $m_{T2}$ over all events ($m_{T2}^{\max }$) are derived. It is noticed that if the decay product of each superparticle involves more than one visible particles, $m_{T2}^{\max }$ being a function of the {\it trial} LSP mass $m_{\chi }$ has a kink structure at $m_{\chi }=$ true LSP mass, which can be used to determine the mother superparticle mass and the LSP mass simultaneously. To see how well $m_{T2}^{\max }$ can be constructed from collider data, a Monte-Carlo analysis of the gluino $m_{T2}$ is performed for some superparticle spectra.

Typos corrected. A few references added. Figures updated

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