LEADER 04126nam 22006375 450 001 9910254607703321 005 20200701191735.0 010 $a981-10-0003-4 024 7 $a10.1007/978-981-10-0003-4 035 $a(CKB)3710000000521753 035 $a(EBL)4182253 035 $a(SSID)ssj0001585533 035 $a(PQKBManifestationID)16263747 035 $a(PQKBTitleCode)TC0001585533 035 $a(PQKBWorkID)14864309 035 $a(PQKB)11570896 035 $a(DE-He213)978-981-10-0003-4 035 $a(MiAaPQ)EBC4182253 035 $a(PPN)190537167 035 $a(EXLCZ)993710000000521753 100 $a20151130d2016 u| 0 101 0 $aeng 135 $aur|n|---||||| 181 $ctxt 182 $cc 183 $acr 200 10$aSearch for Scalar Top Quarks and Higgsino-Like Neutralinos $eSUSY Hunting With a ?Soft? Lepton at the LHC /$fby Takuya Nobe 205 $a1st ed. 2016. 210 1$aSingapore :$cSpringer Singapore :$cImprint: Springer,$d2016. 215 $a1 online resource (229 p.) 225 1 $aSpringer Theses, Recognizing Outstanding Ph.D. Research,$x2190-5053 300 $a"Doctoral Thesis accepted by Tokyo Institute of Technology, Tokyo, Japan." 311 $a981-10-0001-8 320 $aIncludes bibliographical references at the end of each chapters. 327 $aIntroduction -- The LHC And The ATLAS Experiment -- Data And Monte Carlo Simulation -- Particle Reconstruction -- Event Selections -- Background Estimation -- Results -- Conclusions. . 330 $aThis book reports a search for theoretically natural supersymmetry (SUSY) at the Large Hadron Collider (LHC). The data collected with the ATLAS detector in 2012 corresponding to 20 /fb of an integrated luminosity have been analyzed for stop pair production in proton?proton collisions at a center-of-mass energy of 8 TeV at the Large Hadron Collider (LHC) in the scenario of the higgsino-like neutralino. The author focuses on stop decaying into a bottom quark and chargino. In the scenario of the higgsino-like neutralino, the mass difference between charginos and neutralinos (?m) is expected to be small, and observable final-state particles are likely to have low-momentum (soft). The autho r develops a dedicated analysis with a soft lepton as a probe of particles from chargino decay, which suppresses the large amount of backgrounds. As a result of the analysis, no significant SUSY signal is observed. The 95% confidence-level exclusion limits are set to masses of stop and neutralino assuming ?m = 20 GeV. The region with ?M (the mass difference between stop and neutralino) < 70 GeV is excluded for the first time at stop mass of less than 210 GeV. The author also excludes the signals with ?M > 120 GeV up to 600 GeV of stop mass with neutralino mass of less than 280 GeV. The author clearly shows very few remaining parameter spaces for light stop (e.g., topology of stop decay is extremely similar to the SM top quark) by combining his results and previous ATLAS analyses. His results provide a strong constraint to searches for new physics in the future. 410 0$aSpringer Theses, Recognizing Outstanding Ph.D. Research,$x2190-5053 606 $aParticle acceleration 606 $aPhysical measurements 606 $aMeasurement 606 $aParticle Acceleration and Detection, Beam Physics$3https://scigraph.springernature.com/ontologies/product-market-codes/P23037 606 $aMeasurement Science and Instrumentation$3https://scigraph.springernature.com/ontologies/product-market-codes/P31040 615 0$aParticle acceleration. 615 0$aPhysical measurements. 615 0$aMeasurement. 615 14$aParticle Acceleration and Detection, Beam Physics. 615 24$aMeasurement Science and Instrumentation. 676 $a530 700 $aNobe$b Takuya$4aut$4http://id.loc.gov/vocabulary/relators/aut$0816199 801 0$bMiAaPQ 801 1$bMiAaPQ 801 2$bMiAaPQ 906 $aBOOK 912 $a9910254607703321 996 $aSearch for Scalar Top Quarks and Higgsino-Like Neutralinos$91821460 997 $aUNINA