This book reports a search for theoretically natural supersymmetry (SUSY) at the Large Hadron Collider (LHC). The data collected with the ATLAS detector in 2012 corresponding to 20 /fb of an integrated luminosity have been analyzed for stop pair production in proton-proton collisions at a center-of-mass energy of 8 TeV at the Large Hadron Collider (LHC) in the scenario of the higgsino-like neutralino. The author focuses on stop decaying into a bottom quark and chargino. In the scenario of the higgsino-like neutralino, the mass difference between charginos and neutralinos (DELTAm) is expected to be small, and observable final-state particles are likely to have low-momentum (soft). The author develops a dedicated analysis with a soft lepton as a probe of particles from chargino decay, which suppresses the large amount of backgrounds. As a result of the analysis, no significant SUSY signal is observed. The 95% confidence-level exclusion limits are set to masses of stop and neutralino assuming DELTAm = 20 GeV. The region with DELTAM (the mass difference between stop and neutralino) < 70 GeV is excluded for the first time at stop mass of less than 210 GeV. The author also excludes the signals with DELTAM > 120 GeV up to 600 GeV of stop mass with neutralino mass of less than 280 GeV. The author clearly shows very few remaining parameter spaces for light stop (e.g., topology of stop decay is extremely similar to the SM top quark) by combining his results and previous ATLAS analyses. His results provide a strong constraint to searches for new physics in the future.
Hit mag HEART MAGAZINE is always at the centre of the goss when it comes to celebs, fashion and style but peppy Ellie is about to discover that it's not all glitz and glamour behind the scenes... Ages: 8 + Ellie's thrilled to be doing work experience at teen magazine, Heart, even though life isn't all celebrity chat and fashion makeovers for the aspiring young journalist. She's trying to track down a famous author for an exclusive interview. But the author's playing hard to get and Ellie can find no way of contacting him. She's frustrated by the everyday tasks that get in the way of her sleuthing. One of these is walking the Editor's pampered pooch, Ferdinand, morning and afternoon. But her trips to the park with the little dog offer her a vital clue that could reveal the author's true identity and when Ferdinand runs away he inadvertently leads her to the elusive star. Check out this stylish new series from the best-selling author of Fame School. Ages: 8 +
A spirited adventure by a gang of explorers. Go exploring with Parker and Thomas as they travel the world for excitement and treasure.