Abstract
AbstractMass and angular distributions of dijets produced in LHC proton-proton collisions at a centre-of-mass energy$ \sqrt{s}=7 $TeV have been studied with the ATLAS detector using the full 2011 data set with an integrated luminosity of 4.8 fb−1. Dijet masses up to ~ 4.0 TeV have been probed. No resonance-like features have been observed in the dijet mass spectrum, and all angular distributions are consistent with the predictions of QCD. Exclusion limits on six hypotheses of new phenomena have been set at 95% CL in terms of mass or energy scale, as appropriate. These hypotheses include excited quarks below 2.83 TeV, colour octet scalars below 1.86 TeV, heavyWbosons below 1.68 TeV, string resonances below 3.61 TeV, quantum black holes with six extra space-time dimensions for quantum gravity scales below 4.11 TeV, and quark contact interactions below a compositeness scale of 7.6 TeV in a destructive interference scenario.
Highlights
At the CERN Large Hadron Collider (LHC), collisions with the largest momentum transfer typically result in final states with two jets of particles with high transverse momentum
11 bins, with boundaries at χi = exp(0.3 × i) with i = 0, . . . , 11, where 0.3 corresponds to three times the coarsest calorimeter segmentation, ∆η = 0.1. These χ distributions are measured in five dijet mass ranges with the expectation that low mjj bins will be dominated by Quantum Chromodynamics (QCD) processes and new phenomena (NP) signals would be found in higher mass bins
Dijet mass and angular distributions have been measured by the ATLAS experiment over a large angular range and√spanning dijet masses up to approximately 4.0 TeV, using 4.8 fb−1 of pp collision data at s = 7 TeV
Summary
At the CERN Large Hadron Collider (LHC), collisions with the largest momentum transfer typically result in final states with two jets of particles with high transverse momentum (pT). The study of these events tests the Standard Model (SM) at the highest energies accessible at the LHC. At these energies, new particles could be produced [1, 2], new interactions between particles could manifest themselves [3,4,5,6], or interactions resulting from the unification of SM with gravity could appear in the TeV range [7,8,9,10,11,12]. LAr/copper and LAr/tungsten modules to provide electromagnetic and hadronic energy measurements, respectively
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
