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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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Searches for Higgs bosons in pp collisions at √{ s} = 7 and 8 TeV in the context of four-generation and fermiophobic models

S. Chatrchyan, +2181 more
- 07 Feb 2013 - 
TL;DR: In this paper, the authors reported results for Higgs bosons in the context of either the standard model extended to include a fourth generation of fermions (SM4) with masses of up to 600 GeV or fermiophobic models.
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Search for heavy resonances decaying into two Higgs bosons or into a Higgs boson and a W or Z boson in proton-proton collisions at 13 TeV

Albert M. Sirunyan, +2362 more
- 01 Jan 2019 - 
TL;DR: In this paper, a search is presented for massive narrow resonances decaying either into two Higgs bosons, or into a higgs boson and a W or Z boson.
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Measurement of the inclusive t t ¯ cross section in pp collisions at √s=5.02 TeV using final states with at least one charged lepton

Albert M. Sirunyan, +2302 more
- 20 Mar 2018 - 
TL;DR: The top quark pair production cross section was measured for the first time in pp collisions at a center-of-mass energy of 5.02 TeV in this paper, which correspond to an integrated luminosity of 27.4 pb$−1.
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Observation of a diffractive contribution to dijet production in proton-proton collisions at √s=7 TeV

S. Chatrchyan, +2181 more
- 08 Jan 2013 - 
TL;DR: In this paper, the cross section for dijet production in proton-proton collisions at √s=7TeV is presented as a function of ξ, a variable that approximates the fractional momentum loss of the scattered proton in single-diffractive events.
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Searches for W′ bosons decaying to a top quark and a bottom quark in proton-proton collisions at 13 TeV

Albert M. Sirunyan, +2271 more
- 13 Jun 2017 - 
TL;DR: In this paper, the same authors presented the most stringent limits for right-handed W′ bosons in the top and bottom quark decay channel in the leptonic and hadronic analyses, respectively.