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Higgs particle is 'found'

  1. Jul 2, 2012 #1
    God particle is 'found': Scientists at Cern expected to announce on Wednesday Higgs boson particle has been discovered


    Scientists 'will say they are 99.99% certain' the particle has been found
    Leading physicists have been invited to event - sparking speculation that Higgs boson particle has been found
    'God Particle' gives particles that make up atoms their mass


    http://www.dailymail.co.uk/sciencet...iggs-boson-particle-discovered-Wednesday.html
     
  2. jcsd
  3. Jul 2, 2012 #2
    Re: Higgs particle is 'found': Scientists at CERN expected to announce on Wednesday

    Oh damn. Something is about to go down. Hopefully, they have yet to discover the Higgs. I want to work at ATLAS! :-/
     
  4. Jul 3, 2012 #3
  5. Jul 3, 2012 #4

    mps

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    Re: Higgs particle is 'found': Scientists at CERN expected to announce on Wednesday

    there'll be other things to discover; you'll still get to work at ATLAS :)
     
  6. Jul 3, 2012 #5

    PAllen

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  7. Jul 3, 2012 #6
    Re: Higgs particle is 'found': Scientists at CERN expected to announce on Wednesday

    How big a result would finding the Higgs be? It seems like a lot of speculation would have made it a very likely find, just a matter of getting enough data.
     
  8. Jul 3, 2012 #7

    arildno

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    Re: Higgs particle is 'found': Scientists at CERN expected to announce on Wednesday

    We will then have gained scientific proof that humans are material beings.
    That is something to be celebrated!
    :smile:
     
  9. Jul 3, 2012 #8

    PAllen

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    Re: Higgs particle is 'found': Scientists at CERN expected to announce on Wednesday

    Depending on whose analysis you believe, 125 gig Higgs favors a supersymmetric extension of the standard model over a vanilla standard model. Based masses of top quark, and W boson, standard model would prefer Higgs over 130 gig (according to some).
     
  10. Jul 3, 2012 #9

    tom.stoer

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    Re: Higgs particle is 'found': Scientists at CERN expected to announce on Wednesday

    If they have already found it, why should they wait another day to announce that they will find it?

    :devil:
     
  11. Jul 3, 2012 #10

    Astronuc

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    Re: Higgs particle is 'found': Scientists at CERN expected to announce on Wednesday

    I saw a number of 122 GeV/c2 today. I'm not sure of the validity. Lot's of rumors/guesses/speculations on the part of outsiders are flying across the internet.

    So let's wait for the announcement later this evening or morning or afternoon in Australia/NZ.
     
  12. Jul 3, 2012 #11

    Hans de Vries

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    Re: Higgs particle is 'found': Scientists at CERN expected to announce on Wednesday

    Transcription of the first few minutes of the video which was temporarily accessible online:


    http://blogs.telegraph.co.uk/news/t...like-the-higgs-boson-has-been-found-probably/

    (The bold is mine)

    Hans
     
    Last edited: Jul 3, 2012
  13. Jul 3, 2012 #12

    Haelfix

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    Re: Higgs particle is 'found': Scientists at CERN expected to announce on Wednesday

    Whats so fascinating about the Higgs particle, is that it is the first example that we know of what seems to be a fundamental elementary scalar in nature.

    The only other examples that we know about, are always arranged (by hand) by some experimentalist somewhere (say in condensed matter).

    What's really quite astonishing about the whole thing, is that scalar field theory is quite sick theoretically. It's the first thing you learn about in a course on quantum field theory, but in some sense its the theory that we have the least control over, and in many ways has the most mysterious and drastic consequences for physics. Thus, it is also one of the last things you end up studying as well.
     
  14. Jul 3, 2012 #13
    Re: Higgs particle is 'found': Scientists at CERN expected to announce on Wednesday

    There was a thread exactly like this that got locked because the mentors wanted to wait until the actual findings were announced to avoid speculation.
     
  15. Jul 4, 2012 #14
    Re: Higgs particle is 'found': Scientists at CERN expected to announce on Wednesday

    Here's live coverage of the press conference, it starts in 20 minutes or so: http://webcast.web.cern.ch/webcast/play_higgs.html [Broken]
     
    Last edited by a moderator: May 6, 2017
  16. Jul 4, 2012 #15

    mfb

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    Re: Higgs particle is 'found': Scientists at CERN expected to announce on Wednesday

    CMS presented a 4.9sigma-signal using the 3 sensitive channels.

    The H->gamma gamma channel is very convincing (with a significance of 4 sigma), here is the summary plot for this channel:

    snlw2333.jpg
     
  17. Jul 4, 2012 #16
    Re: Higgs particle is 'found': Scientists at CERN expected to announce on Wednesday

    Result from the conference:
    They observed a new boson with mass of 125.3 ± 0.6 GeV at 4.9[itex]\sigma[/itex] significance.
     
  18. Jul 4, 2012 #17
    Re: Higgs particle is 'found': Scientists at CERN expected to announce on Wednesday

    Is there any chance this is not the Higgs but something else?
     
  19. Jul 4, 2012 #18

    mfb

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    Re: Higgs particle is 'found': Scientists at CERN expected to announce on Wednesday

    I do not know of any reasonable alternative, and it fits very well to the expectation of the Standard Model Higgs. It could be something else, but I would not expect anything surprising there.

    Edit: Here is the corresponding ATLAS plot, giving (local) 4.5 sigma in the H->gamma gamma channel.

    68or2i9m.jpg
     
    Last edited: Jul 4, 2012
  20. Jul 4, 2012 #19
    Re: Higgs particle is 'found': Scientists at CERN expected to announce on Wednesday



    It's BIG. It's confirming the veracity of the Standard Model, which certain circles doubted because of the hypotethical nature of the Higgs(until now).
     
  21. Jul 4, 2012 #20
    Re: Higgs particle is 'found': Scientists at CERN expected to announce on Wednesday

    Can someone explain to me how they know this particle is a boson?
     
  22. Jul 4, 2012 #21

    mfb

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    Re: Higgs particle is 'found': Scientists at CERN expected to announce on Wednesday

    This cannot be verified from the data now, but further studies might study the spin, too, by analysing the angular distributions of the decay products.
    Apart from that, theory requires that the Higgs particle is a boson. If it is not, it has to be something else, it cannot be the particles which corresponds to the field responsible for electroweak symmetry breaking.

    Edit: Combined significance at ATLAS is 5.0 Sigma.
    They quote 126.5 GeV as mass.
     
    Last edited: Jul 4, 2012
  23. Jul 4, 2012 #22
    Re: Higgs particle is 'found': Scientists at CERN expected to announce on Wednesday

    What are the properties they already analysed that leads them to conclude it is the Higgs? I thought they had the spin 0 already?
     
  24. Jul 4, 2012 #23

    mfb

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    Re: Higgs particle is 'found': Scientists at CERN expected to announce on Wednesday

    The decay channels [itex]H \to \gamma \gamma[/itex] and [itex]H \to Z (\to ll) Z^* (\to ll)[/itex] with the predicted cross-section*branching fraction and the rough mass, consistent with precision SM experiments with other particles. At the same time, no unexpected excess elsewhere.
     
    Last edited: Jul 4, 2012
  25. Jul 4, 2012 #24
    Re: Higgs particle is 'found': Scientists at CERN expected to announce on Wednesday

    I'm pretty sure I heard someone say that they knew it was a boson, maybe I misheard.
     
  26. Jul 4, 2012 #25
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