Journal
PHYSICAL REVIEW LETTERS
Volume 105, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.051802
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Funding
- U.S. Department of Energy [DE-FG02-97ER41029, DE-AC02-76SF00515]
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We propose a new model-independent technique for mass measurements in missing energy events at hadron colliders. We illustrate our method with the most challenging case of a single-step decay chain. We consider inclusive same-sign chargino pair production in supersymmetry, followed by leptonic decays to sneutrinos chi(+)chi(+) -> l(+)l'(+)(nu) over tildel (nu) over tilde and invisible decays (nu) over tilde -> nu l (chi) over tilde (0)(1). We introduce two one-dimensional decompositions of the Cambridge M-T2 variable: M-T2 parallel to and M-T2 perpendicular to, on the direction of the upstream transverse momentum P-T and the direction orthogonal to it, respectively. We show that the sneutrino mass M-c can be measured directly by minimizing the number of events N((M) over tilde (c)) in which M-T2 exceeds a certain threshold, conveniently measured from the end point M-T2 perpendicular to(max)((M) over tilde (c)).
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