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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.

Papers
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Evidence for transverse-momentum- and pseudorapidity-dependent event-plane fluctuations in PbPb and pPb collisions

Vardan Khachatryan, +2262 more
- 22 Sep 2015 - 
TL;DR: In this article, a systematic study of the factorization of long-range azimuthal twoparticle correlations into a product of single-particle anisotropies is presented as a function of pT and nu of both particles.
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Performance of τ-lepton reconstruction and identification in CMS

S. Chatrchyan, +2288 more
- 01 Jan 2012 - 
TL;DR: In this paper, the performance of tau-lepton reconstruction and identification algorithms was studied using a data sample of proton-proton collisions at 7 TeV, corresponding to an integrated luminosity of 36 inverse picobarns collected with the CMS detector at the LHC.
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Measurement of the inelastic proton-proton cross section at s√=7 TeV

S. Chatrchyan, +2195 more
- 13 May 2013 - 
TL;DR: In this paper, a measurement of the inelastic proton-proton cross section at a center-of-mass energy of 7 TeV was presented using the CMS detector at the LHC.
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Measurement of isolated photon production in pp and PbPb collisions at sNN=2.76 TeV

S. Chatrchyan, +2242 more
- 04 Apr 2012 - 
TL;DR: In this article, isolated photon production is measured in proton-proton and lead-lead collisions at nucleon-nucleon centre-of-mass energies of 2.76 TeV in the pseudorapidity range |eta|<1.44 and transverse energies ET between 20 and 80 GeV with the CMS detector at the LHC.
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Search for new physics in events with same-sign dileptons and jets in pp collisions at √s = 8 TeV

S. Chatrchyan, +2268 more
TL;DR: In this article, a search for new physics was performed based on events with jets and a pair of isolated, same-sign leptons, and the results were obtained using a sample of proton-proton collision data collected by the CMS experiment at a centre-of-mass energy of 8 TeV at the LHC, corresponding to an integrated luminosity of 19.5 fb−1.