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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 light bosons in decays of the 125 GeV Higgs boson in proton-proton collisions at √s=8 TeV

Vardan Khachatryan, +2334 more
- 08 Jan 2017 - 
TL;DR: In this paper, a search is presented for decays beyond the standard model of the 125 GeV Higgs bosons to a pair of light bosons, based on models with extended scalar sectors.
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Observation of a New Ξ b Baryon

S. Chatrchyan, +2236 more
- 21 Jun 2012 - 
TL;DR: The observation of a new b baryon via its strong decay into Ξ(b)(-) π(+) (plus charge conjugates) is reported, with a significance exceeding 5 standard deviations.
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Search for pair produced fourth-generation up-type quarks in pp collisions at √s=7 TeV with a lepton in the final state

S. Chatrchyan, +2166 more
TL;DR: The results of a search for the pair production of a fourth-generation up-type quark (t′t′) in proton-proton collisions at View the MathML sources=7 TeV are presented, using data corresponding to an integrated luminosity of about 5.0 fb−1 collected by the Compact Muon Solenoid experiment at the LHC as discussed by the authors.
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Measurement of the Υ(1S), Υ(2S), and Υ(3S) cross sections in pp collisions at s=7TeV

S. Chatrchyan, +2174 more
- 25 Nov 2013 - 
TL;DR: In this paper, the ϒ resonances are identified through their decays to dimuons using a data sample corresponding to an integrated luminosity of 35.8 ± 1.4 pb^(−1) of proton-proton collisions at √s = 7 TeV.
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Azimuthal anisotropy of charged particles with transverse momentum up to 100 GeV/ c in PbPb collisions at sNN=5.02 TeV

Albert M. Sirunyan, +2237 more
- 10 Jan 2018 - 
TL;DR: In this paper, the Fourier coefficients v[2] and v[3] characterizing the anisotropy of the azimuthal distribution of charged particles produced in PbPb collisions at sqrt(s[NN]) = 5.02 TeV are measured with data collected by the CMS experiment.