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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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Observation of the χb1 (3P) and χb2 (3P) and Measurement of their Masses

Albert M. Sirunyan, +2353 more
TL;DR: This is the first time that the J=1 and 2 states are well resolved and their masses individually measured, and they are determined with respect to the world-average value of the ϒ(3S) mass, which has an uncertainty of 0.5 MeV.
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Measurement of the underlying event activity in inclusive Z boson production in proton-proton collisions at √s=13 TeV

Albert M. Sirunyan, +2330 more
TL;DR: In this paper, a measurement of the underlying event activity in proton-proton collisions at a center-of-mass energy of 13 TeV was performed using Z boson production events collected with the CMS experiment at the LHC.
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Search for stop production in R-parity-violating supersymmetry at HERA

Sergei Chekanov, +325 more
TL;DR: In this article, a search for stop production in R-parity-violating supersymmetry has been performed in e+p interactions with the ZEUS detector at HERA, using an integrated luminosity of 65 p-1.
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Search for new physics with dijet angular distributions in proton-proton collisions at √s=13 TeV

Albert M. Sirunyan, +2304 more
TL;DR: In this article, a search for extra spatial dimensions, quantum black holes, and quark contact interactions in measurements of dijet angular distributions in proton-proton collisions at root S = 13TeV is presented.
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Search for stealth supersymmetry in events with jets, either photons or leptons, and low missing transverse momentum in pp collisions at 8 TeV

Vardan Khachatryan, +2146 more
- 09 Apr 2015 - 
TL;DR: In this paper, the results of a search for new physics in final states with jets, either photons or leptons, and low missing transverse momentum are reported, based on a sample of proton-proton collisions collected at center-of-mass energy sqrt(s) = 8 TeV with the CMS detector in 2012.