All posts by Research group CMS collaboration

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Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC

CMS Collaboration

Results are presented from searches for the standard model Higgs boson in proton–proton collisions at  √√s=7 and 8 TeV in the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC), using data samples corresponding to integrated luminosities of up to 5.1 fb−1 at 7 TeV and 5.3 fb−1 at 8 TeV.

Article published in “Physics Letters B”, Received 31 July 2012.  Received in revised form 9 August 2012. Accepted 11 August 2012 – Available online 18 August 2012.

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Jet momentum dependence of jet quenching in PbPb collisions at √SNN = 2.76 TeV

Dijet production in PbPb collisions at a nucleon-nucleon centre-of-mass energy of 2.76 TeV is studied with the CMS detector at the LHC. A data sample corresponding to an integrated luminosity of 150 µb¯¹ is analyzed. Jets are reconstructed using combined information from tracking and calorimetry. The dijet momentum balance and angular correlations are studied as a function of collision centrality and leading jet transverse momentum. For the most peripheral PbPb collisions, good agreement of the dijet momentum balance distributions with pp data and reference calculations at the same collision energy is found, while more central collisions show a strong imbalance of leading and subleading jet transverse momenta attributed to the jet-quenching effect. The dijet momentum imbalance in central collisions is found to persist for leading jet transverse momenta up to the highest values studied.

Article first published in “Physics Letters B”, universally available online 27 April 2012.

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