I’ve changed the title since subsequent updates have morphed this into an entirely new post. Here is what I wrote yesterday:
CERN officials are of course being tight-lipped about the content of tomorrow’s announcement of the full combined CMS/Atlas dataset for 2011 (5.5 inverse femtobarns, corresponding to over 380 trillion proton collisions), but the rumor mill has been active. Here is what we can pretty safely expect:
- No formal announcement of a Higgs boson discovery (at least not to 5 sigma of certainty).
- Exclusion of the Higgs down to approximately 130 GeV.
- Possible Higgs-like excess around 125 GeV (which is right in the sweet spot for SM predictions), but not to a high degree of certainty (3 sigma for Atlas, 2 sigma for CMS). More data will be needed to weed out background signal in this noisy region to determine whether this is a real signal or not.
And the results are in. As expected, slight excesses were seen, but nothing spectacular. More data will need to be collected to determine whether the excesses were a statistical fluke or not.
ATLAS results indicate a weak (3.6 sigma) signal around 126 GeV. ATLAS data excludes Higgs from the regions including 114-115 GeV and 135 and up, leaving only the 115 to 131 GeV window.
CMS results are weaker, showing a small (2.4 sigma) signal at around 124 GeV. (Actually, CMS is seeing several tiny bumps.) Higgs is excluded in the range from 127 GeV to 600 GeV.
Correction to the original posting above: No results of an analysis of the full combined dataset were announced. Analysis by each detector team (ATLAS and CMS) were done separately on their own datasets.
Some discussions of results from around the physics blogosphere:
- Higgs Update Today: Inconclusive, As Expected | Matt Strassler | Of Particular Significance
- Higgs Liveblog – LIVE NOW | Aidan Randle-Conde | Quantum Diaries
- Last chance for a Higgs prediction | Alexey Petrov | Quantum Diaries
- Firm Evidence Of A Higgs Boson At Last! | Tommaso Dorigo | A Quantum Diaries Survivor
- The CERN Higgs seminar | Jim Rohlf | Quantum Diaries
- Evolution or revolution? The search for the Higgs boson puts particle physics on the threshold of a new era. | CERN | Quantum Diaries
- Today’s Higgs Results | Peter Woit | Not Even Wrong
- Fermilab hot on trail of Higgs boson with LHC, Tevatron | Fermilab | Quantum Diaries
- Visual on Higgs, it seems… | Jester | RÉSONAANCES
- Don’t let the black dots fool you…. | Ken Bloom | Quantum Diaries
- Mass effect: maybe Higgs, maybe not | Phil Plait | Bad Astronomy
- Science! It Marches On | Sean Carroll | Cosmic Variance
- Higgs Boson Live Blog: Analysis of the CERN announcement | Phillip Gibbs | viXra log
- Higgs seminar discussion | Aidan Randle-Conde | Quantum Diaries
- Brookhaven Lab and the Search for the Higgs | Brookhaven | Quantum Diaries
- LHC May Have Revealed First Hints of Higgs | Adam Mann | Wired Science
- What Did I Learn Today, During and After Presentation? | Matt Strassler | Of Particular Significance
- Glimpses of Higgs | Marco Frasca | The Gauge Connection
- The Large Hadron Collider, the Higgs, and Hope | Ethan Siegel | Starts With A Bang
- Eilam Gross: Higgs – The Best There Is, For Now | Tommaso Dorigo | A Quantum Diaries Survivor
- It might look like a Higgs but does it really sing like one? | CERN | Quantum Diaries
- First Glimpse of the Higgs Boson: Guest post from Jack Gunion | John Conway | Cosmic Variance