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ATLAS' Peter Jenni going to Stockholm to receive prize for Higgs boson discovery 23 May 2013

The High Energy and Particle Physics Prize 2013

ATLAS collaboration (CERN, CH)
CMS collaboration (CERN, CH)

For the discovery of a Higgs boson as predicted by the Brout-Englert-Higgs mechanism

Michel Della Negra (CERN, now at Imperial College London, UK)
Peter Jenni (CERN, now at Freiburg University, DE)
Tejinder Virdee (Imperial College London, UK)

For their pioneering and outstanding leadership rôles in the making of the ATLAS and CMS experiments.

Congratulations to ATLAS Spokesperson Fabiola Gianotti, Time Person-of-the-Year runner-up 19 December 2012

Time person-of-the-year runner-up - a beautiful end to a fantastic year for the LHC and the ATLAS collaboration.

Higgs Search goes Multivariate 10 June 2012

Searching for the Higgs boson in the decay channel where the Higgs decays to two W bosons which in turn decay to an electron or a muon together with their corresponding neutrino represents the most sensitive search channel over a wide mass range. Due to the presence of neutrinos, the final state is kinematically under-constraint. In a novel ATLAS analysis, we (and our local collaborators from SFU and UBC) test ATLAS candidate events for the Higgs signal and Standard Model background hypothesis based on Fermi's Golden rule that probes the full dimensionality of the phase space beyond single kinematic observables. Details can be found here.

Searches for Resonances decaying into top quarks 09 June 2012

The top quark is as heavy as a gold atom. Unusually heavy for an elementary particle. For that reason, it may play a special role in physics beyond the Standard Model that we are trying to identify. We (and our local collaborators from SFU and UBC) searched for a di-top resonance for the first time in the channel where both W bosons originating from the top quark decay into an electron or a muon together with their corresponding neutrino. In the absence of a signal we set limits on the production of Kaluza-Klein Gluons, that appear in extra dimensional model, with masses greater than 1.1 TeV. Details can be found here.

Z' and Excited Lepton Searches updated with 5/fb 06 March 2012

The Z' and excited lepton analyses are among the first ATLAS Beyond the Standard Model searches that have been updated to the full 2011 dataset of 5/fb and are being shown at the ongoing winter conferences. We now exclude a Z' (Sequential Standard Model) below 2.21 TeV and Randall-Sundrum Gravitons below 2.16 TeV. All excited electron and muon hypotheses are excluded below 2 TeV. These represent the most stringent limits to date. For more information see the ATLAS public Z' page and the excited lepton page.

LHC to run at 8 TeV in 2012 13 February 2012

The LHC will run with a beam energy of 4 TeV this year, 0.5 TeV higher than in 2010 and 2011.

Z' search published in PRL 31 January 2012

The ~1/fb summer  result that we submitted to PRL is now published.The reference is: Phys. Rev. Lett. 107, 272002 (2011). This analysis sets stringent limits on spin-1 Z' (1.83 TeV) and spin-2 Graviton (1.63 TeV) resonances. The result was also featured in last months edition of CERN COURIER, click here. We are working on the next paper with 5/fb, the full 2011 dataset.

News on SUSY 27 January 2012

SUperSYmmetry is one of the most promising theories for Physics Beyond the Standard Model. The TRIUMF group, in collaboration with the UBC group, has released the result of a search for SUSY in events with at least four leptons and missing transverse momentum. What is data telling us? 

Hundredth ATLAS Physics Paper Submitted 05 January 2012

ATLAS has just submitted its hundredth paper based on collision data for publication!  For a full list of ATLAS published (or submitted) papers see https://twiki.cern.ch/twiki/bin/view/AtlasPublic

End of 2011 run 07 December 2011

Today is the last day of the 2011 heavy ion run at the LHC; Christmas shutdown starts tomorrow.  Looking forward to next year, and even more data!

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