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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 the elliptic anisotropy of charged particles produced in PbPb collisions at √sNN=2.76 TeV

S. Chatrchyan, +2187 more
- 07 Jan 2013 - 
TL;DR: In this article, the anisotropy of the azimuthal distributions of charged particles produced in √s_(NN)=2.76 TeV PbPb collisions with the CMS experiment at the LHC is studied with the event plane method, two-and fourparticle cumulants, and Lee-Yang zeros.
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Search for Heavy Neutral Leptons in Events with Three Charged Leptons in Proton-Proton Collisions at √s = 13 TeV

Albert M. Sirunyan, +2286 more
- 08 Feb 2018 - 
TL;DR: These are the first direct limits for N mass above 500 GeV and the first limits obtained at a hadron collider for N masses below 40 Ge V.
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Search for dark matter and large extra dimensions in monojet events in pp collisions at √s = 7 TeV

S. Chatrchyan, +2262 more
TL;DR: In this paper, a search was made for events containing an energetic jet and an imbalance in transverse momentum using a data sample of pp collisions at a center-of-mass energy of 7 TeV.
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Measurements of inclusive W and Z cross sections in pp collisions at \sqrt {s} = 7 TeV

Vardan Khachatryan, +2187 more
- 01 Jan 2011 - 
TL;DR: In this article, the W and Z boson production cross sections in pp collisions at 7 TeV are presented, based on 2.9 inverse picobarns of data recorded by the CMS detector at the LHC.
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Measurement of the differential cross section for top quark pair production in pp collisions at √s=8 TeV

Vardan Khachatryan, +2125 more
- 17 May 2015 - 
TL;DR: In this article, the normalized differential cross section for top quark pair (tt) production is measured in pp collisions at a centre-of-mass energy of 8TeV at the CERN LHC using the CMS detector in data corresponding to an integrated luminosity of 19.7fb^(−1).