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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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Search for long-lived charged particles in proton-proton collisions at √s = 13 TeV

Vardan Khachatryan, +2244 more
- 27 Sep 2016 - 
TL;DR: In this paper, a search for heavy stable charged particles produced in proton-proton collisions at √s = 13 TeV using a data sample corresponding to an integrated luminosity of 2.5 fb^(-1) collected in 2015 with the CMS detector at the CERN LHC was conducted using signatures of anomalously high energy deposits in the silicon tracker and long time-of-flight measurements by the muon system.
Journal ArticleDOI

Measurement of the prompt J/ψ and ψ(2S) polarizations in pp collisions at s=7 TeV

S. Chatrchyan, +2203 more
TL;DR: In this article, the polarizations of the prompt J/ψJ /ψ and ψ(2S)ψ( 2S) mesons were measured in proton-proton collisions at View the MathML sources=7 TeV, using a dimuon data sample collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 4.9 fb−1.2.
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Angular analysis of the decay B0→K⁎0μ+μ− from pp collisions at s=8 TeV

Vardan Khachatryan, +2290 more
- 10 Feb 2016 - 
TL;DR: In this article, the angular distribution and the differential branching fraction of the decay B0 to K*0(892) mu mu are studied using data corresponding to an integrated luminosity of 20.5 inverse femtobarns collected with the CMS detector at the LHC in pp collisions at sqrt(s) = 8 TeV.
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Measurement of higher-order harmonic azimuthal anisotropy in PbPb collisions at s NN =2.76 TeV

S. Chatrchyan, +2185 more
- 11 Apr 2014 - 
TL;DR: In this paper, higher-order harmonic coefficients of charged particles were analyzed using the event plane, multiparticle cumulant, and Lee-Yang zeros methods, which provide different sensitivities to initial-state fluctuations.
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Determination of the top-quark pole mass and strong coupling constant from the tt̄ production cross section in pp collisions at √s = 7 TeV

S. Chatrchyan, +2270 more
- 20 Jan 2014 - 
TL;DR: In this paper, the authors compared the QCD prediction with various parton distribution functions to determine the top-quark pole mass, View the MathML sourcemtpole, or the strong coupling constant, αSαS.