Author: Bruce William LeClairePublisher:
ISBN:
Category :
Languages : en
Pages : 206
Book Description
A Search for Supersymmetic Electrons with the Mark II Detector at PEP
Author: Bruce William LeClairePublisher:
ISBN:
Category :
Languages : en
Pages : 206
Book Description
Energy Research Abstracts
Author: High Energy Physics Index
Author: Searches for New Particles at PEP.
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The status of searches for new particles at the PEP storage ring is reviewed. The result of the excited electron search by MARKII is presented and a limit on the coupling strength of the e*e.gamma. vertex is given. The search for single photons in the ASP and MAC detectors is reported and the results are used to set limits on the number of light neutrino species and, in the context of supersymmetry (SUSY) theories, are interpreted as setting simultaneous limits on the masses of the selectron and photino.
Physics Briefs
Author: Index to American Doctoral Dissertations
Author: Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 1252
Book Description
Scientific and Technical Aerospace Reports
Author: INIS Atomindex
Author: From Electron Reconstruction and Identification to the Search for Supersymmetry at the Atlas Experiment
Author: Tuan NguyenPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Supersymmetry is currently the leading candidate for physics beyond the Standard Model. The LHC, operating as the highest centre-of-mass energy collider to date, has been providing physicists with ample opportunities for verifying if supersymmetry exists. The treatment of signal electrons represents a significant part in searches for supersymmetry that involve leptons (electrons and muons) in the final state at ATLAS. In processes that can yield a final state that consists of a pair of same-sign leptons, correct electron charge measurement is extremely important, because of the potentially large contribution to the background due to (overwhelmingly) large Standard Model sources of opposite-sign dileptons. An estimation of the rate of electron charge mis-identification by a likelihood function is presented; the method has been applied to correct simulation predictions for mis-identification rates by the ATLAS collaboration. On the other hand, processes that target gluino pair-production are highly motivated by the naturalness problem and their high cross-section at the LHC. A search on the data collected in the 2015-2016 period, at √s = 13 TeV and corresponding to an integrated luminosity of 36.1 fb−1, is presented. The final state consists of large missing transverse momentum and multiple jets, of which at least three must be b-jets. The leptonic channel, which requires in addition at least one lepton (an electron or a muon), is discussed in detail, including the boosted p_T-dependent muon-jet overlap-removal scheme used in the analysis as well as the optimization of the signal regions. No discovery is claimed. Model-independent limits are set on the visible cross-section for new physics processes, and model-dependent limits are set for gluino and neutralino masses. Gluino masses of less than 1.97 TeV for neutralino masses below approximately 300 GeV are excluded at the 95% CL, showing an improvement over the same analysis using the 2015 dataset alone. Boosted top quark decays, in which the daughter particles of the top quarks are found close to each other, were expected to occur more frequently as the centre-of-mass of the LHC underwent an upgrade to 13 TeV starting early 2015. In supersymmetry searches that involve supersymmetric particles decaying into the Standard Model top quarks, such decays lead to a considerable increase in signal acceptance as electrons overlapping with jets are selected. A discussion of the method and the initial measurement of the identification efficiencies for electrons overlapping with jets is presented, representing the first attempt at such measurements for electrons produced inside boosted top quarks.
Progress in Electroweak Interactions
Author: J. Thanh Van TranPublisher: Atlantica Séguier Frontières
ISBN: 9782863320426
Category : Electroweak interactions
Languages : en
Pages : 666
Book Description