9 research outputs found
Spacetime and vacuum as seen from Moscow
An extended text of the talk given at the conference ``2001: A Spacetime
Odyssey'', to be published in the Proceedings of the Inaugural Conference of
the Michigan Center for Theoretical Physics, University of Michigan, Ann Arbor,
21-25 May 2001, M.J. Duff and J.T. Liu eds., World Scientific, Singapore, 2002;
and of Historical Lecture ``Vacuum as seen from Moscow'' at the CERN Summer
School, 10 August, 2001. Contents: Introduction; Pomeranchuk on vacuum; Landau
on parity, P, and combined parity, CP; Search and discovery of ; "Mirror world"; Zeldovich and cosmological term; QCD vacuum
condensates; Sakharov and baryonic asymmetry of the universe, BAU; Kirzhnits
and phase transitions; Vacuum domain walls; Monopoles, strings, instantons, and
sphalerons; False vacuum; Inflation; Brane and Bulk; Acknowledgments;
References.Comment: 17 pages, 2 figure
Supersymmetry in carbon nanotubes in a transverse magnetic field
Electron properties of Carbon nanotubes in a transverse magnetic field are
studied using a model of a massless Dirac particle on a cylinder. The problem
possesses supersymmetry which protects low energy states and ensures stability
of the metallic behavior in arbitrarily large fields. In metallic tubes we find
suppression of the Fermi velocity at half-filling and enhancement of the
density of states. In semiconducting tubes the energy gap is suppressed. These
features qualitatively persist (although to a smaller degree) in the presence
of electron interactions. The possibilities of experimental observation of
these effects are discussed.Comment: A new section on electron interaction effects added and explanation
on roles of supersymmetry expanded. Revtex4, 6 EPS figure file
Felix Alexandrovich Berezin and his work
This is a survey of Berezin's work focused on three topics: representation
theory, general concept of quantization, and supermathematics.Comment: LaTeX, 27 page
Towards Measuring the Stop Mixing Angle at the LHC
We address the question of how to determine the stop mixing angle and its
CP-violating phase at the LHC. As an observable we discuss ratios of branching
ratios for different decay modes of the light stop ~t_1 to charginos and
neutralinos. These observables can have a very strong dependence on the
parameters of the stop sector. We discuss in detail the origin of these
effects. Using various combinations of the ratios of branching ratios we argue
that, depending on the scenario, the observable may be promising in exposing
the light stop mass, the mixing angle and the CP phase. This will, however,
require a good knowledge of the supersymmetric spectrum, which is likely to be
achievable only in combination with results from a linear collider.Comment: 30 pages, 11 figures, version to appear in EPJ
Searching for Higgs : From LEP towards LHC
After a brief introduction to the theoretical basis of the Higgs mechanism
for generating the masses of elementary particles, the experimental searches
for Higgs particles will be summarized, from bounds at LEP to inferences for
LHC. The report will focus on the Standard Model, though some central results
on extended Higgs systems, as conjectured for example in supersymmetric
theories, will also be recapitulated. Alternative scenarios based on
spontaneous symmetry breaking by novel strong interactions are adumbrated at
the theoretical level.Comment: Added reference
Search for new phenomena in final states with large jet multiplicities and missing transverse momentum with ATLAS using root s=13 TeV proton-proton collisions
Results are reported of a search for new phenomena, such as supersymmetric particle production, that could be observed in high-energy proton-proton collisions. Events with large numbers of jets, together with missing transverse momentum from unobserved particles, are selected. The data analysed were recorded by the ATLAS experiment during 2015 using the 13 TeV centre-of-mass proton-proton collisions at the Large Hadron Collider, and correspond to an integrated luminosity of 3.2 fb(-1). The search selected events with various jet multiplicities from >= 7 to >= 10 jets, and with various b-jet multiplicity requirements to enhance sensitivity. No excess above Standard Model expectations is observed. The results are interpreted within two supersymmetry models, where gluino masses up to 1400 GeV are excluded at 95% confidence level, significantly extending previous limits. (C) 2016 CERN for the benefit of the ATLAS Collaboration. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP(3)