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Have Scientists Found Two Different Higgs Bosons?

  1. Dec 17, 2012 #1

    Drakkith

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    From here: http://blogs.scientificamerican.com...-scientists-found-two-different-higgs-bosons/

    So how significant would this be if it turns out to be true? I wasn't aware that there had been predictions of more than one Higgs in the first place, but the article says there was.

    Also:

    What's the significance of this? I don't know much about particle decay.
     
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  3. Dec 17, 2012 #2

    K^2

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    Could one of these simply be a high energy resonance of one of the mesons? I'm not sure there would be any way to tell what they are detecting from, say, ##\small \pi^0##. Of course, if one of these is just a meson resonance, then who's to say the other one isn't also?

    Besides energy and ##\small 2\gamma## mode, what are they using to verify that it's actually a Higgs Boson? If somebody has a reference to an actual article, I'd appretiate it.
     
  4. Dec 18, 2012 #3

    Bill_K

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    The universal belief is that this is just an experimental difficulty. ATLAS sees it, but the other group CMS does not. See the Resonaances blog for a good discussion.
     
  5. Dec 18, 2012 #4

    Vanadium 50

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    This is shamefully inaccurate blogging. The experiments are not claiming two peaks. It's all noise from the blogosphere.
     
  6. Dec 18, 2012 #5

    Bill_K

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    V50, I hope you're not knocking the Resonaances blog, which is accurate and well-informed, and IMO one of the top five sources of particle information on the web. He makes clear, I think, that the "two peaks" are the best fits in different channels, 123.5 GeV for the ZZ channel and 126.6 for γγ, undoubtedly due to a calibration error.
     
  7. Dec 18, 2012 #6
    The statistical significance of this difference is only 2.7[itex]\sigma[/itex], so it could also be mainly a statistical fluctuation (maybe with a little push from a small calibration error)
     
  8. Dec 18, 2012 #7

    jim mcnamara

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    I particularly like Resonaances third possible cause for the ATLAS problem, speaking of reliable reporting. The one involving ethanol.
     
  9. Dec 18, 2012 #8

    mfb

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    To quote the ATLAS conference note:
    Nothing serious, just bad luck or a calibration problem.


    @K^2: Other decay channels, their branching fractions (which agree very well with the SM) and the angular distribution to determine its spin (which indicates spin 0).
     
  10. Dec 18, 2012 #9

    George Jones

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    The Scientific American blog linked in the original post was guilty of "shamefully inaccurate blogging." According to Matt Strassler, this blog entry has been rewritten somewhat,

    http://profmattstrassler.com/2012/12/17/two-higgs-bosons-no-evidence-for-that/.
     
  11. Dec 18, 2012 #10

    K^2

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    That certainly makes sense. I've found some theory papers on the decay modes, so I can now sit down and sort through it. Experimental papers ever only make my teeth hurt.
     
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