Study of Black Holes with the ATLAS detector at the LHC

We evaluate the potential of the ATLAS detector for discovering black holes produced at the LHC, as predicted in models with large extra dimensions where quantum gravity is at the TeV scale. We assume that black holes decay by Hawking evaporation to all Standard Model particles democratically. We comment on the possibility to estimate the Planck scale.Comment: 27 page

Mass Measurement of the Decaying Bino at the LHC

In some class of supersymmetric (SUSY) models, the neutral Wino becomes the lightest superparticle and the Bino decays into the Wino and standard-model particles. In such models, we show that the measurement of the Bino mass is possible if the short charged tracks (with the length of O(10 cm)) can be identified as a signal of the charged-Wino production. We pay particular attention to the anomaly-mediated SUSY-breaking (AMSB) model with a generic form of K\"ahler potential, in which only the gauginos are kinematically accessible superparticles to the LHC, and discuss the implication of the Bino mass measurement for the test of the AMSB model.Comment: 13 pages, 3 figures, 1 tabl

Drell-Yan Production of Z' in the Three-Site Higgsless Model at the LHC

In the Higgsless models, there are extra gauge bosons which keep the perturbative unitarity of a longitudinally polarized gauge boson. The three-site Higgsless model is a minimal Higgsless model and contains three extra gauge bosons, $W^{\prime \pm}$ and Z'. In this paper, we report the discovery potential of the Z' gauge boson via Drell-Yan production with Z'(mass=380, 500, 600 GeV) $\rightarrow WW \rightarrow \ell\nu qq$ ($\ell=e$, $\mu$) at the LHC ($\sqrt{s}$=14 TeV).Comment: 7 pages, 5 figures included. References revise

Discovery reach for wino and higgsino dark matter with a disappearing track signature at a 100 TeV pppp collider

Within the theory of supersymmetry, the lightest neutralino is a dark matter candidate and is often assumed to be the lightest supersymmetric particle (LSP) as well. If the neutral wino or higgsino is dark matter, the upper limit of the LSP mass is determined by the observed relic density of dark matter. If the LSP is a nearly-pure neutral state of the wino or higgsino, the lightest chargino state is expected to have a significant lifetime due to a tiny mass difference between the LSP and the chargino. This article presents discovery potential of the 100 TeV future circular hadron collider (FCC) for the wino and higgsino dark matter using a disappearing-track signature. The search strategy to extend the discovery reach to the thermal limits of wino/higgsino dark matter is discussed with detailed studies on the background rate and the reference design of the FCC-hadron detector under possible running scenarios of the FCC-hadron machine. A proposal of modifying the detector layout and several ideas to improve the sensitivity further are also discussed.Comment: 10 pages, 7 figures, 4 table