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Achim Geiser

Researcher at University of Hamburg

Publications -  1474
Citations -  93498

Achim Geiser is an academic researcher from University of Hamburg. The author has contributed to research in topics: Large Hadron Collider & Lepton. The author has an hindex of 129, co-authored 1331 publications receiving 84136 citations. Previous affiliations of Achim Geiser include RWTH Aachen University & Technical University of Dortmund.

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Measurement of masses in the tt̄ system by kinematic endpoints in pp collisions at √s = 7 TeV

S. Chatrchyan, +3886 more
TL;DR: In this article, a simultaneous measurement of the top-quark, W-boson, and neutrino masses is reported for t t-bar events selected in the dilepton final state from a data sample corresponding to an integrated luminosity of 5.0 inverse femtobarns collected by the CMS experiment in pp collisions at sqrt(s)=7 TeV.
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Inclusive search for squarks and gluinos in pp collisions at √s=7 TeV

S. Chatrchyan, +2284 more
- 11 Jan 2012 - 
TL;DR: In this paper, a search is performed for heavy particle pairs produced in 7 TeV proton-proton collisions with 35 inverse picobarns of data collected by the CMS experiment at the LHC.
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Searches for light- and heavy-flavour three-jet resonances in pp collisions at √s=8 TeV

S. Chatrchyan, +2197 more
- 07 Mar 2014 - 
TL;DR: In this paper, a search for three-jet hadronic resonance production in pp collisions at a centre-of-mass energy of 8 TeV has been conducted by the CMS Collaboration at the LHC with a data sample corresponding to an integrated luminosity of 19.4 fb−119.4
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Search for exclusive or semi-exclusive gamma gamma production and observation of exclusive and semi-exclusive e(+)e(-) production in pp collisions at root s=7 TeV

S. Chatrchyan, +2260 more
TL;DR: In this paper, a search for exclusive or semi-exclusive γγ production, pp → p^(*) + ǫ+γ + p * (where p * stands for a diffractively-dissociated proton), and the observation of exclusive and semi exclusive e^+e^− production in proton-proton collisions at s√=7 TeV, were presented.
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Prediction of neutrino fluxes in the NOMAD experiment

P. Astier, +158 more
TL;DR: In this paper, a method for the calculation of the flux and composition of the West Area Neutrino Beam used by NOMAD in its search for neutrino oscillations is described.