Saturday, October 1, 2011

Plot of the Day

I have no idea where he got it from, but Jester at Resonaances posts this fairy field exclusion plot for the Tevatron. The $119$ GeV fairy that seems to be in vogue now, for the simple reason that almost all other masses are already excluded, does not look so good on this plot.

Update: Jester says the plot comes from the summer conferences, so it's a few months old. Funny how I've never seen it in any of the ThereMustBeFairies discussions.


  1. The plot is a Tevatron combined bb plot that was described by Phil Gibbs on his viXra log blog:
    "... the Tevatron has an advantage in being able to see events where the Higgs decays into bottom quarks ...
    At the LHC the higher energy and higher pile-up make these events harder to separate from the background
    the Tevatron ... combined bb plot shows no sign of a Higgs signal below 130 GeV ... It may be that they have been unlucky with the stats, or that the resolution and background separation has not been as good as they think. It could also be that the Higgs is not in that region. They would really need to at least double the amount of data they have to start to rule it out
    ATLAS and CMS ... look for Higgs decaying to two photons in this region ... From that diphoton graph alone you cannot say much because all variations are well within the sigma bands. These bumps are just reflecting where the relatively few events that have been seen so far have fallen. ... However some of those bumps are repeated in other decay modes and the combined plots are getting close to hinting at a signal.
    The 140 GeV bump is the most convincing statistically so far
    the region around 120 GeV is on track for a signal but much more data is needed there.
    We need the next update which will have about 5/fb per experiment before we can start talking seriously....".

    Also on that blog, Ondra commented
    "... CMS and ATLAS can gain rather good information about 119 GeV Higgs even with 4 fb-1 ...[ the amount already collected now by the LHC ]...".

    There is a Hadron Collider Physics conference at Paris beginning 14 November 2011, about which Phil Gibbs said
    "... The HCP program looks good with talks where they could present new search data and combinations. ...".


  2. Thanks for the info, Tony. So we wait until November.


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