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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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Journal ArticleDOI

Measurement of the hadronic activity in events with a Z and two jets and extraction of the cross section for the electroweak production of a Z with two jets in pp collisions at √s = 7 TeV

S. Chatrchyan, +2246 more
- 10 Oct 2013 - 
TL;DR: The first measurement of the electroweak production cross section of a Z boson with two jets in pp collisions at s√=7 TeV is presented, based on a data sample recorded by the CMS experiment at the LHC with an integrated luminosity of 5 fb^(−1) as discussed by the authors.
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Prompt neutrino fluxes in the atmosphere with PROSA parton distribution functions

Maria Vittoria Garzelli, +7 more
- 01 May 2017 - 
TL;DR: In this paper, the effects on atmospheric prompt neutrino fluxes of present uncertainties affecting the nucleon composition are studied by using the PROSA fit to parton distribution functions (PDFs).
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Precision luminosity measurement in proton-proton collisions at s=13TeV in 2015 and 2016 at CMS.

Albert M. Sirunyan, +2392 more
- 05 Apr 2021 - 
TL;DR: In this paper, the authors measured the absolute luminosity scale of individual bunch crossings using beam-separation scans (the van der Meer method), with a relative precision of 1.3 and 1.0% in 2015 and 2016, respectively.
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Search for a light charged Higgs boson decaying to c(s)over-bar in pp collisions at root s=8 TeV

Vardan Khachatryan, +2382 more
- 29 Dec 2015 - 
TL;DR: In this paper, a search for a light charged Higgs boson, originating from the decay of a top quark and subsequently decaying into a charm quark, and a strange antiquark, is presented.
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Pileup mitigation at CMS in 13 TeV data

Albert M. Sirunyan, +2288 more
- 01 Mar 2020 - 
TL;DR: In this article, the performance of these techniques for jet and missing transverse momentum reconstruction, as well as muon isolation is surveyed. But the authors focus on the identification of pileup jets, the jet energy, mass, and angular resolution, missing transversal momentum resolution, and Muon isolation when using pileup per particle identification.