Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-10-09
Phys.Rev.Lett.107:061801,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
thoroughly revised; all new figures; new results on pages 3 and 4; new illustrative example; includes detector simulation. 4 p
Scientific paper
10.1103/PhysRevLett.107.061801
We present a general solution to the long standing problem of determining the masses of pair-produced, semi-invisibly decaying particles at hadron colliders. We define two new transverse kinematic variables, $M_{CT_\perp}$ and $M_{CT_\parallel}$, which are suitable one-dimensional projections of the contransverse mass $M_{CT}$. We derive analytical formulas for the boundaries of the kinematically allowed regions in the $(M_{CT_\perp},M_{CT_\parallel})$ and $(M_{CT_\perp},M_{CT})$ parameter planes, and introduce suitable variables $D_{CT_\parallel}$ and $D_{CT}$ to measure the distance to those boundaries on an event per event basis. We show that the masses can be reliably extracted from the endpoint measurements of $M_{CT_\perp}^{max}$ and $D_{CT}^{min}$ (or $D_{CT_\parallel}^{min}$). We illustrate our method with dilepton $t\bar{t}$ events at the LHC.
Matchev Konstantin T.
Park Myeonghun
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