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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 supersymmetry in the all-hadronic final state using top quark tagging in pp collisions at s =13 TeV

Vardan Khachatryan, +2259 more
- 25 Jul 2017 - 
TL;DR: In this article, a search for supersymmetry in all-hadronic events with missing transverse momentum and tagged top quarks is presented, and exclusion limits at 95% confidence level on the masses of new particles in the context of simplified models of direct and gluino-mediated top squark production.
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Measurement of the azimuthal anisotropy of neutral pions in Pb-Pb collisions at √sNN=2.76 TeV

S. Chatrchyan, +2181 more
- 22 Jan 2013 - 
TL;DR: In this article, the amplitudes of the second Fourier component (v_2) of the π^0 azimuthal distributions are extracted using an event-plane technique, and the values of v_2 are studied as a function of the neutral pion transverse momentum (p_T) for different classes of collision centrality.
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Search for a heavy gauge boson W′ in the final state with an electron and large missing transverse energy in pp collisions at √s = 7 TeV

Vardan Khachatryan, +2155 more
- 28 Mar 2011 - 
TL;DR: A search for a heavy gauge boson W' has been conducted by the CMS experiment at the LHC in the decay channel with an electron and large transverse energy imbalance, using proton-proton collision data corresponding to an integrated luminosity of 36 inverse picobarns.

Measurement of Differential Cross Sections for Z Boson Production in Association with Jets in Proton-Proton Collisions at √s = 13 TeV

Albert M. Sirunyan, +2281 more
TL;DR: In this article, the production of a Z boson, decaying to two charged leptons, in association with jets in proton-proton collisions at a centre-of-mass energy of 13 TeV is measured.
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Principal-component analysis of two-particle azimuthal correlations in PbPb and pPb collisions at CMS

Albert M. Sirunyan, +2224 more
- 05 Dec 2017 - 
TL;DR: In this article, a principle component analysis is used to separate out different orthogonal modes of the two-particle correlation matrix from heavy ion collisions using data from sNN = 2.76TeV PbPb and sNN=5.02TeV pPb collisions collected by the CMS experiment at the CERN Large Hadron Collider.