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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 dijet resonances in proton–proton collisions at √s=13TeV and constraints on dark matter and other models

Albert M. Sirunyan, +2241 more
- 10 Jun 2017 - 
TL;DR: In this article, the authors acknowledge the enduring support for the construction and operation of the LHC and the CMS detector provided by the following funding agencies: BMWFW and FWF (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, and FAPESP (Brazil); MES (Bulgaria); CERN; CAS, MOST, and NSFC (China); COLCIEN-CIAS (Colombia); DAE and DST (India); IPM (Iran);
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A search for a doubly-charged Higgs boson in pp collisions at √s=7 TeV

S. Chatrchyan, +3896 more
- 07 Nov 2012 - 
TL;DR: In this article, a doubly-charged Higgs boson search was performed using events with three or more isolated charged leptons of any flavor, giving sensitivity to the decays of pair-produced triplet components.
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Measurement of jet fragmentation into charged particles in pp and PbPb collisions at √sNN=2.76 TeV

S. Chatrchyan, +2103 more
TL;DR: In this paper, the authors compared the fragmentation functions in pp and PbPb collisions at a centre-of-mass energy of 2.76 TeV per nucleon pair using data collected with the CMS detector at the LHC.
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Evidence for the direct decay of the 125 GeV Higgs boson to fermions

S. Chatrchyan, +2229 more
- 25 Jan 2014 - 
TL;DR: In this article, the authors reported strong evidence for the direct coupling of the 125 GeV Higgs boson to down-type fermions, with an observed significance of 3.8 standard deviations, when 4.4 are expected.
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Search for Dark Matter and Large Extra Dimensions in pp Collisions Yielding a Photon and Missing Transverse Energy

S. Chatrchyan, +2269 more
- 27 Jun 2012 - 
TL;DR: In this paper, a search for new physics in the final state containing a photon and missing transverse energy was conducted, and the authors set 90% confidence level (CL) upper limits for spin-dependent chi-nucleon scattering for chi masses between 1 and 100 GeV.