Large Hadron Collider: Difference between revisions

Revision as of 09:25, 19 September 2013

Revision as of 09:40, 19 September 2013

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|23 Oct 2011||The high luminosity experiments ATLAS and CMS reach 5 fb⁻¹ of collected data.

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Nov 2011||Second run with lead ions.

|22 Dec 2011||First new particle discovery, the χ_b (3P) [[bottomonium]] state, observed during Lead Ion collisions.<ref name="dec 2011 particle">{{cite news|author=Jonathan Amos|url=http://www.bbc.co.uk/news/science-environment-16301908|title=LHC reports discovery of its first new particle|publisher=BBC News|date=22 December 2011}}</ref>

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|22 Dec 2011||First new composite particle discovery, the χ_b (3P) [[bottomonium]] statemeson, observed duringwith Lead Ionproton-proton collisions in 2011.<ref name="dec 2011 particle">{{cite news|author=Jonathan Amos|url=http://www.bbc.co.uk/news/science-environment-16301908|title=LHC reports discovery of its first new particle|publisher=BBC News|date=22 December 2011}}</ref>

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|5 Apr 2012||First collisions with stable beams in 2012 after the winter shutdown. The energy is increased to 4 TeV per beam (8 TeV in collisions).<ref>{{cite web|url=http://press.web.cern.ch/press/PressReleases/Releases2012/PR10.12E.html|title=LHC physics data taking gets underway at new record collision energy of 8TeV|publisher=Press.web.cern.ch|date=5 April 2012|accessdate=2012-04-05}}</ref>

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|4 July 2012||SecondFirst new elementary particle discovery, a new boson observed that is "consistent with" the theorized Higgs boson. (This has now been confirmed as the Higgs boson itself.<ref name="CERN 03-14-2013">{{cite news | url=http://home.web.cern.ch/about/updates/2013/03/new-results-indicate-new-particle-higgs-boson | title=New results indicate that new particle is a Higgs boson|publisher=CERN|date=14 March 2013|accessdate=14 March 2013}}</ref>)

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|8 Nov 2012|| First observation of the very rare decay of the B_s [[meson]] into two [[muon]]s (B_s⁰ → μ⁺μ⁻), a major test of [[supersymmetry]] theories,<ref name="LCHb Nov 2012">{{cite news|last=Ghosh|first=Pallab|title=Popular physics theory running out of hiding places|url=http://www.bbc.co.uk/news/science-environment-20300100|accessdate=14 November 2012|newspaper=BBC News|date=12 Nov 2012}}</ref> shows results at 3.5 sigma that match the Standard Model rather than many of its supersymmetrical variants.

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|14 Feb 2013||Beginning of the first long shutdown, to prepare the collider for a higher energy and luminosity.

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