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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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Jet and underlying event properties as a function of charged-particle multiplicity in proton–proton collisions at √s = 7 TeV

S. Chatrchyan, +3955 more
- 11 Dec 2013 - 
TL;DR: In this paper, the authors studied the characteristics of multi-particle production in proton-proton collisions at 7 TeV and compared the predictions of the PYTHIA and HERWIG event generators.
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Search for dark matter produced in association with heavy-flavor quark pairs in proton-proton collisions at √s=13TeV

Albert M. Sirunyan, +2174 more
- 08 Jun 2017 - 
TL;DR: This analysis is the first to perform a statistical combination of searches for dark matter produced with different heavy-flavor final states and provides exclusions that are stronger than those achieved with individual heavy- Flavour final states.
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Search for decays of stopped exotic long-lived particles produced in proton-proton collisions at ?s=13 TeV

Albert M. Sirunyan, +2367 more
- 21 May 2018 - 
TL;DR: In this paper, a search for the decays of heavy exotic long-lived particles (LLPs) that are produced in proton-proton collisions at a center-of-mass energy of 13 TeV at the CERN LHC and come to rest in the CMS detector is presented.
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Measurement of the integrated and differential tt¯ production cross sections for high- pT top quarks in pp collisions at s=8 TeV

Vardan Khachatryan, +2357 more
- 12 Oct 2016 - 
TL;DR: Kachatryan et al. as mentioned in this paper acknowledge the enduring support for the construction and operation of the LHC and the CMS detector provided by the following funding agencies: theAustrian Federal Ministry of Science, Research and Development, and the Austrian Science Fund; the Belgian National Research Institute, and Fondation National de la Recherche Scientifique, and Wetenschappelijk Onderzoek; the Brazilian Funding Agencies (CNPq, CAPES, FAPERJ, andFAPESP); the Bulgarian Ministry of Education and Science
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Search for the associated production of a Higgs boson with a single top quark in proton-proton collisions at √s = 8 TeV

Albert M. Sirunyan, +2352 more
- 30 Jun 2016 - 
TL;DR: In this paper, the authors presented the search for the production of a Higgs boson in association with a single top quark, using data collected in proton-proton collisions at a center-of-mass energy of 8 TeV corresponding to an integrated luminosity of 19.7 inverse femtobarns.