Editing UA2 experiment (section)

==Background==
Around 1968 [[Sheldon Glashow]], [[Steven Weinberg]], and [[Abdus Salam]] came up with the [[electroweak theory]], which unified [[electromagnetism]] and [[weak interactions]], and for which they shared the 1979 [[Nobel Prize in Physics]].<ref>{{cite web |url=http://www.nobelprize.org/nobel_prizes/physics/laureates/1979/ |title=The Nobel Prize in Physics 1979 |author=<!--Not stated--> |date=15 October 1979 |website=Nobelprize.org |access-date=28 July 2017 }}</ref> The theory postulated the existence of W and Z bosons, and the pressure on the research community to prove the existence of these particles experimentally was substantial. During the 70s it was established that the masses of the [[W and Z boson]]s were in the range of 60 to 80 GeV (W boson) and 75 to 92 GeV (Z boson) — energies too large to be accessible by any [[Particle accelerator|accelerator]] in operation at that time.<ref name=Rubbia>{{cite book |last1=Di Lella |first1=Luigi |last2=Rubbia |first2=Carlo |year=2015  |chapter=The Discovery of the W and Z Bosons|title=60 Years of CERN Experiments and Discoveries |series=Advanced Series on Directions in High Energy Physics |volume=23 |publisher=World Scientific |pages=137–163 |isbn=978-981-4644-14-3 |doi=10.1142/9789814644150_0006|chapter-url=https://cds.cern.ch/record/2103277 |url=https://cds.cern.ch/record/2103277 }}</ref> In 1976, [[Carlo Rubbia]], [[Peter McIntyre (physicist)|Peter McIntyre]] and [[David B. Cline|David Cline]] proposed to modify a proton accelerator — at that time a proton accelerator was already running at [[Fermilab]] and one was under construction at CERN (SPS) —  into a [[proton]]–[[antiproton]] collider, able to reach energies large enough to produce W and Z bosons.<ref>{{cite conference |url=https://cds.cern.ch/record/2137187?ln=en |title=Producing Massive Neutral Intermediate Vector Bosons with Existing Accelerators |last1=Rubbia |first1=C. |last2=McIntyre |first2=P. |last3=Cline |first3=D. |date=8 June 1976 |location=Aachen, Germany |conference=International Neutrino Conference 1976 }}</ref> The proposal was adopted at [[CERN]] in 1978, and the [[Super Proton Synchrotron]] (SPS) was modified to occasionally operate as a [[Proton–Antiproton Collider|proton-antiproton collider]] (Sp{{overline|p}}S).<ref>{{cite book|last1=Krige|first1=John|editor1-last=Krige|editor1-first=John|title=History of CERN. Volume III|date=1996|publisher=North-Holland|location=Amsterdam|pages=207–251|chapter=The ppbar Project. I. The Collider}}</ref>