Higgs boson searches with CMS
    By Tommaso Dorigo | October 19th 2009 10:31 AM | 6 comments | Print | E-mail | Track Comments
    About Tommaso

    I am an experimental particle physicist working with the CMS experiment at CERN. In my spare time I play chess, abuse the piano, and aim my dobson...

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    As I mentioned yesterday, I was able to put together a proceedings paper on the "Search for the Standard Model Higgs boson with the CMS Detector" with the help of a collaborator, Eleni Petrakou. The article will be available on the ArXiv preprint server tomorrow, or even today by clicking on the picture below, which shows part of the first page. The article is quite simple to read and quite short. It should be readable by anybody, not just experts. I will be available to answer any question you may have on its contents, as always. Enjoy!

    front page of PIC09 proceedings


    How's the status of Higgs to diphoton channel in CMS?

    Well, I am sitting at a CMS meeting where they are showing an adjournament of precisely that analysis, right now. But I cannot say anything about it, since it is not approved material yet. I can tell you that Atlas estimated a significance of 3.6 standard deviations for a 120 GeV Higgs boson in the H->gamma gamma search with 200 inverse picobarns (next year's expected stat), but this assumed 14 TeV c.m. energy. The two detectors are not too different, but CMS has definitely the better electromagnetic calorimeter... You draw your own conclusions.

    How about searches below the LEP limit? Nonstandard Higgs(es) can live there yet CMS always stops the analysis at that point, or don´t they?

    Nonstandard Higgs searches do not look only above 90 GeV, no; but they are really "nonstandard", and so they do not get much attention. If you are interested I can check whether there's anything available.

    It would be interesting to see model-independent searches below that limit.

    Hi there,
    it would even be worthwhile to re-exclude a (more or less) SM-like Higgs below the LEP bound.
    This could stop all the discussion about the "\sim 2 sigma effect at \approx 98 GeV". :-)
    Probably the only viable channel would be gamma gamma. Unfortunately (but understandably)
    this seems to have a very low priority in ATLAS and CMS.

    Cheers, Sven