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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

Evidence for collectivity in pp collisions at the LHC

Vardan Khachatryan, +2276 more
- 10 Feb 2017 - 
TL;DR: In this article, the second-order and third-order azimuthal anisotropy harmonics of unidentified charged particles, as well as v2v2 of View the MathML sourceKS0 and ViewTheMathML sourceΛ/Λ ǫ particles, are extracted from long-range two-particle correlations as functions of particle multiplicity and transverse momentum.
Proceedings Article

Study of the Mass and Spin-Parity of the Higgs Boson Candidate via Its Decays to Z Boson Pairs

S. Chatrchyan, +2187 more
Journal ArticleDOI

Search for lepton-flavour-violating decays of the Higgs boson

Vardan Khachatryan, +2157 more
- 07 Oct 2015 - 
TL;DR: The first direct search for lepton-flavour-violating decays of the recently discovered Higgs boson (H) is described in this paper, where the search is performed in the H→μτ_e and H→mτ_h channels, where τeτe and τ_h are tau leptons reconstructed in the electronic and hadronic decay channels, respectively.
Journal ArticleDOI

Observation of sequential Υ suppression in PbPb collisions

S. Chatrchyan, +2268 more
- 26 Nov 2012 - 
TL;DR: In this paper, the suppression of individual nS states in PbPb collisions with respect to their yields in pp data has been measured, and the results demonstrate the sequential suppression of the Υ(nS) states from the dimuon invariant mass spectra.
Journal ArticleDOI

Searches for long-lived charged particles in pp collisions at sqrt(s) = 7 and 8 TeV

S. Chatrchyan, +2270 more
- 19 Jul 2013 - 
TL;DR: In this article, results of searches for heavy stable charged particles produced in pp collisions at 7 and 8 TeV are presented corresponding to an integrated luminosity of 5.0 and 18.8 inverse femtobarns, respectively.