LHC physics data taking gets underway at new record collision energy of 8TeV
(PhysOrg.com) -- At 0:38 CEST (18:38 EDT) this morning, the LHC shift crew declared stable beams as two 4 TeV proton beams were brought into collision at the LHCs four interaction points. This signals the start of physics data taking by the LHC experiments for 2012. The collision energy of 8 TeV is a new world record, and increases the machines discovery potential considerably.
The experience of two good years of running at 3.5 TeV per beam gave us the confidence to increase the energy for this year without any significant risk to the machine, explained CERN1s Director for Accelerators and Technology, Steve Myers. Now its over to the experiments to make the best of the increased discovery potential were delivering them!
Although the increase in collision energy is relatively modest, it translates to an increased discovery potential that can be several times higher for certain hypothetical particles. Some such particles, for example those predicted by supersymmetry, would be produced much more copiously at the higher energy. Supersymetry is a theory in particle physics that goes beyond the current Standard Model, and could account for the dark matter of the Universe.
Standard Model Higgs particles, if they exist, will also be produced more copiously at 8 TeV than at 7 TeV, but background processes that mimic the Higgs signal will also increase. That means that the full years running will still be necessary to convert the tantalising hints seen in 2011 into a discovery, or to rule out the Standard Model Higgs particle altogether.
The increase in energy is all about maximising the discovery potential of the LHC, said CERN Research Director Sergio Bertolucci. And in that respect, 2012 looks set to be a vintage year for particle physics.
The LHC is now scheduled to run until the end of 2012, when it will go into its first long shutdown in preparation for running at an energy of 6.5 TeV per beam as of late 2014, with the ultimate goal of ramping up to the full design energy of 7 TeV.