Won Sang Cho

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We present a detailed study of the collider observable mT2 applied for pair-produced superparticles decaying to visible particles and a pair of invisible lightest supersymmetric particles (LSPs). Analytic expressions of the maximum of mT2 over all events (mmax T2 ) are derived. It is noticed that if the decay product of each superparticle involves more than(More)
We investigate the possibility to measure the top quark mass using the collider variable mT2 at the LHC experiment. Monte Carlo studies of mT2 are performed with the events corresponding to the dilepton decays of tt̄ produced at the LHC with 10 fb−1 integrated luminosity. Our analysis suggests that the top quark mass can be determined by the mT2 variable(More)
We discuss nonstandard interpretations of the 750 GeV diphoton excess recently reported by the ATLAS and CMS Collaborations which do not involve a new, relatively broad resonance with a mass near 750 GeV. Instead, we consider the sequential cascade decay of a much heavier, possibly quite narrow, resonance into two photons along with one or more additional(More)
We introduce a new observable, "gluino m_{T2}," which is an application of the Cambridge m_{T2} variable to the process where gluinos are pair produced in a proton-proton collision and each gluino subsequently decays into two quarks and one lightest supersymmetric particle, i.e., g[over ]g[over ]-->qqchi[over ]_{1};{0}qqchi[over ]_{1};{0}. We show that the(More)
We discuss the MT2-kink method to determine the masses of both the dark matter WIMP and its mother particle produced at the LHC. We then introduce a new kinematic variable, the MT2-Assisted-On-Shell (MAOS) momentum, that provides a systematic approximation to the invisible particle momenta in hadron collider events producing a pair of invisible particles,(More)
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