A. Badertscher
ETH Zurich
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Publication
Featured researches published by A. Badertscher.
Physical Review D | 2007
A. Badertscher; P. Crivelli; W. Fetscher; U. Gendotti; Sergei Gninenko; V. Postoev; A. Rubbia; V.D. Samoylenko; D. Sillou
The results of a new search for positronium decays into invisible final states are reported. Convincing detection of this decay mode would be a strong evidence for new physics beyond the standard model (SM): for example, the existence of extrachar21{}dimensions, of milli-charged particles, of new light gauge bosons or of mirror particles. Mirror matter could be a relevant dark matter candidate. In this paper the setup and the results of a new experiment are presented. In a collected sample of about
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2011
A. Badertscher; A. Curioni; L. Knecht; D Lussi; A. Marchionni; G. Natterer; F. Resnati; A. Rubbia; T. Viant
(6.31ifmmodepmelsetextpmfi{}0.28)ifmmodetimeselsetexttimesfi{}{10}^{6}
Physics Letters B | 1999
H.-Ch. Schröder; A. Badertscher; P.F.A. Goudsmit; M. Janousch; H.J. Leisi; E. Matsinos; D. Sigg; Z.G. Zhao; D. Chatellard; J.-P. Egger; E. Jeannet; K. Gabathuler; P. Hauser; L. M. Simons; A.J. Rusi El Hassani
orthopositronium decays, no evidence for invisible decays in an energy [0,80] keV was found and an upper limit on the branching ratio of orthopositronium
Nuclear Physics | 1996
D. Sigg; A. Badertscher; P.F.A. Goudsmit; H.J. Leisi; G.C. Oades
mathrm{o}mathrm{text{ensuremath{-}}}mathrm{Ps}ensuremath{rightarrow}mathrm{text{invisible}}
Nuclear Physics | 1997
D. Chatellard; J.-P. Egger; E. Jeannet; A. Badertscher; M. Bogdan; P.F.A. Goudsmit; M. Janousch; H.J. Leisi; E. Matsinos; H.-Ch. Schröder; D. Sigg; Z.G. Zhao; E.C. Aschenauer; K. Gabathuler; P. Hauser; L. M. Simons; A. J. Rusi El Hassani
could be set:
Physics Letters B | 1997
A. Badertscher; M. Daum; R. Frosch; P.F.A. Goudsmit; W. Hajdas; M. Janousch; P.-R. Kettle; V. Markushin; J. Schottmüller; Z.G. Zhao
mathrm{Br}(mathrm{o}mathrm{text{ensuremath{-}}}mathrm{Ps}ensuremath{rightarrow}mathrm{text{invisible}})l4.2ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}7}(90%mathrm{C}.mathrm{L}.)
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2006
N. Alberola; T. Anthonioz; A. Badertscher; C. Bas; A. S. Belov; P. Crivelli; Sergei Gninenko; N.A. Golubev; M.M. Kirsanov; A. Rubbia; D. Sillou
Our results provide a limit on the photon mirror-photon mixing strength
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2005
A. Badertscher; M. Laffranchi; A. Meregaglia; A. Müller; A. Rubbia
ϵensuremath{le}1.55ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}7}(90%mathrm{C}.mathrm{L}.)
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1993
A. Badertscher; M. Bogdan; P.F.A. Goudsmit; L. Knecht; H.J. Leisi; H.-Ch. Schröder; D. Sigg; Z.G. Zhao; D. Chatellard; J.-P. Egger; E. Jeannet; E.C. Aschenauer; K. Gabathuler; L. M. Simons; A.J. Rusi El Hassani
and rule out particles lighter than the electron mass with a fraction
Hyperfine Interactions | 1999
J. Schottmüller; A. Badertscher; M. Daum; P.F.A. Goudsmit; M. Janousch; P.-R. Kettle; J. Koglin; V.E. Markushin; Z.G. Zhao
{Q}_{x}ensuremath{le}3.4ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}5}
