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Josef Hammer

Researcher at CERN

Publications -  637
Citations -  64338

Josef Hammer is an academic researcher from CERN. The author has contributed to research in topics: Large Hadron Collider & Standard Model. The author has an hindex of 120, co-authored 631 publications receiving 60840 citations. Previous affiliations of Josef Hammer include École Polytechnique & Austrian Academy of Sciences.

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Measurement of isolated photon production in pp and PbPb collisions at sNN=2.76 TeV

S. Chatrchyan, +2242 more
- 04 Apr 2012 - 
TL;DR: In this article, isolated photon production is measured in proton-proton and lead-lead collisions at nucleon-nucleon centre-of-mass energies of 2.76 TeV in the pseudorapidity range |eta|<1.44 and transverse energies ET between 20 and 80 GeV with the CMS detector at the LHC.
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Search for new physics in events with same-sign dileptons and jets in pp collisions at √s = 8 TeV

S. Chatrchyan, +2268 more
TL;DR: In this article, a search for new physics was performed based on events with jets and a pair of isolated, same-sign leptons, and the results were obtained using a sample of proton-proton collision data collected by the CMS experiment at a centre-of-mass energy of 8 TeV at the LHC, corresponding to an integrated luminosity of 19.5 fb−1.
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Measurement of differential top-quark-pair production cross sections in pp collisions at √s = 7TeV

S. Chatrchyan, +3867 more
- 19 Mar 2013 - 
TL;DR: Normalised differential top-quark pair production cross sections are measured in pp collisions at a centre-of-mass energy of 7 TeV at the LHC with the CMS detector using data recorded in 2011 corresponding to an integrated luminosity of 5.0 inverse femtobarns as discussed by the authors.
Journal ArticleDOI

Measurement of the muon charge asymmetry in inclusive pp →w+X production at s =7TeV and an improved determination of light parton distribution functions

S. Chatrchyan, +2197 more
- 13 Aug 2014 - 
TL;DR: In this article, the muon charge asymmetry in inclusive pp to WX production at 7 TeV was measured with a sample of more than twenty million W to mu nu events, and the statistical precision was greatly improved in comparison to previous measurements.
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Search for long-lived particles that decay into final states containing two electrons or two muons in proton-proton collisions at s =8TeV

Vardan Khachatryan, +2118 more
TL;DR: In this article, upper limits on the product of the cross section and branching fraction of such a signal are presented as a function of the long-lived particle's mean proper decay length.