Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-06-30
JHEP 0712:076,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
41 pages, 14 figures, various clarifications and expanded discussion included in revised version that conforms to the version
Scientific paper
10.1088/1126-6708/2007/12/076
We describe a kinematic method which is capable of determining the overall mass scale in SUSY-like events at a hadron collider with two missing (dark matter) particles. We focus on the kinematic topology in which a pair of identical particles is produced with each decaying to two leptons and an invisible particle (schematically, $pp\to YY+jets$ followed by each $Y$ decaying via $Y\to \ell X\to \ell\ell'N$ where $N$ is invisible). This topology arises in many SUSY processes such as squark and gluino production and decay, not to mention $t\anti t$ di-lepton decays. In the example where the final state leptons are all muons, our errors on the masses of the particles $Y$, $X$ and $N$ in the decay chain range from 4 GeV for 2000 events after cuts to 13 GeV for 400 events after cuts. Errors for mass differences are much smaller. Our ability to determine masses comes from considering all the kinematic information in the event, including the missing momentum, in conjunction with the quadratic constraints that arise from the $Y$, $X$ and $N$ mass-shell conditions. Realistic missing momentum and lepton momenta uncertainties are included in the analysis.
Cheng Hsin-Chia
Gunion John F.
Han Zhenyu
Marandella Guido
McElrath Bob
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