Berkeley CSUA MOTD:Entry 54626
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2022/06/25 [General] UID:1000 Activity:popular
6/25    

2013/3/14-5/5 [Science/Physics] UID:54626 Activity:nil
3/14    "Confirmed! Newfound Particle Is the Higgs"
        http://news.yahoo.com/confirmed-newfound-particle-higgs-130317830.html
        GREAT!!
        \_ so, what's next?
           \_ "Q: Why does Higgs Boson have mass?"
2022/06/25 [General] UID:1000 Activity:popular
6/25    

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	...
Cache (5660 bytes)
news.yahoo.com/confirmed-newfound-particle-higgs-130317830.html
FILE - This 2011 image provide by CERN, shows a real CMS proton-proton collision in which four high energy electrons (green lines and red towers) are observed in a 2011 event. The event shows characteristics expected from the decay of a Higgs boson but is also consistent with background Standard Model physics processes. Physicists in Italy said Wednesday, March 6, 2013 they are closer to concluding that what they found last year was the elusive "God particle." But they still haven't reached that "Eureka moment" when they can announce the Higgs boson is found. The long theorized subatomic particle would explain why matter has mass and has been called a missing cornerstone of physics. Large Hadron Collider (LHC) -- where protons zip at near light-speed around the 17-mile-long (27 kilometer) underground ring beneath Switzerland and France -- physicists say the particle is the Higgs. In Photos: Searching for the Higgs Boson "The preliminary results with the full 2012 data set are magnificent and to me it is clear that we are dealing with a Higgs boson though we still have a long way to go to know what kind of Higgs boson it is," said CMS spokesperson Joe Incandela in a statement. Dave Charlton, ATLAS spokesperson agreed, the new results "point to the new particle having the spin-parity of a Higgs boson as in the Standard Model," referring to a quantum property of elementary particles. To confirm the particle as the Higgs boson, physicists needed to collect tons of data that would reveal its quantum properties as well as how it interacted with other particles. For instance, a Higgs particle should have no spin and its parity, or the measure of how its mirror image behaves, should be positive, both of which were supported by data from the ATLAS and CMS experiments. Even so, the scientists are not sure whether this Higgs boson is the one predicted by the Standard Model or perhaps the lightest of several bosons predicted to exist by other theories. Seeing how this particle decays into other particles could let physicists know whether this Higgs is the "plain vanilla" Standard Model Higgs. Detecting a Higgs boson is rare, with just one observed for every 1 trillion proton-proton collisions. As such, the LHC physicists say they need much more data to understand all of the ways in which the Higgs decays. Its mass of 126 times the mass of the proton is just about what would be needed to create a fundamentally unstable universe that would lead to a cataclysm billions of years from now. "It may be the universe we live in is inherently unstable, and at some point billions of years from now it's all going to get wiped out," added Lykken, a collaborator on the CMS experiment. 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