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Apologies for the continued and still continuing hiatus, readers. I’m talking time off from school/work/research/blogging and have been for some time now, for those who weren’t aware. I have an unfortunate slew of health issues (auto-immune disease) that I’m dealing with right now and have had to step back from some things to keep the work-life balance in check. Hopefully, I’ll be making my return to blogging (and physics [and health]) soon.
Update (April 25th, 2011) at end.
So I woke up this morning to several emails about a strange “Higgs sighting” at ATLAS.
On a , a commenter named
shared an abstract purporting observations of some 115 GeV resonance at CERN.
It claims to be from an “internal note” from the ATLAS Collaboration.
Higgs? says:
Internal Note
Report number
ATL-COM-PHYS-
Observation of a γγ resonance at a mass in the vicinity of 115 GeV/c2 at ATLAS and its Higgs interpretation
Fang, Y (-) ; Flores Castillo, L R (-) ; Wang, H (-) ; Wu, S L (University of Wisconsin-Madison)
21 Apr 2011. – mult. p.
Subject category
Detectors and Experimental Techniques
Accelerator/Facility, Experiment
CERN LHC ; ATLAS
Free keywords
D R EWEAK ; HIGGS ; SUSY ; EXOTICS ; EGAMMA
Motivated by the result of the Higgs boson candidates at LEP
with a mass of about 115~GeV/c2, the observation given in ATLAS note
ATL-COM-PHYS- (November 18, 2010) and the publication
“Production of isolated Higgs particle at the Large Hadron Collider
Physics” (Letters B 683 ), we studied the γγ invariant mass
distribution over the range of 80 to 150 GeV/c2. With 37.5~pb-1 data
from 2010 and 26.0~pb-1 from 2011, we observe a γγ resonance around
115~GeV/c2 with a significance of 4σ. The event rate for this resonance
is about thirty times larger than the expectation from Higgs to γγ in
the standard model. This channel H→γγ is of great importance because the
presence of new heavy particles can enhance strongly both the Higgs
production cross section and the decay branching ratio. This large
enhancement over the standard model rate implies that the present result
is the first definitive observation of physics beyond the standard
model. Exciting new physics, including new particles, may be expected to
be found in the very near future.
Is this a Higgs sighting? Well, the abstract says, “the event rate…is about thirty times larger than the expectation from Higgs to γγ in the standard model” making it certainly not evidence for a Standard Model Higgs.
Is it a real observation? That’s a better question at this point.
Better still, is this a real note?
I don’t work with CERN, so my login doesn’t give me permission to access internal memos (in fact, I can only read the partial title “Observation of a γγ resonance at a mass”?) although others have told me that the paper is actually there and does claim what the abstract is presenting (although perhaps not convincingly).
One of my favourite ATLAS postdocs, , said,
The line from the management is “This is not an official result of the ATLAS experiment.”
“Not an official result”. Hmm…
Now, the authors are a little interesting because they include . Wu is often associated with her excitement, near the end of the LEP days, when her team thought they had observed a Higgs candidate around 114GeV/c2 (it was basically ruled out later).
The energies being so similar here make this curious.
Another important thing to point out is that the CDF has also been focused on the H→γγ search and has seen no 115 GeV bump in their data [see
[pdf] from April 18th, 2011].
If this sizable 115 GeV bump was being found in ATLAS data, the CDF should also have seen a hint of it, not, nothing.
At this point, I see no reason in speculating on what this [result] means.
It’s a rumour.
The analysis may be very limited.
The data may be non-existent.
And it’s not impossible that someone uploaded it to the CERN servers as a joke.
If the ATLAS Collaboration were to release it themselves, then we could be excited (and if people want to start throwing around “fourth generation”, “non-Standard Higgs”, “SUSY confirmed/ruled out”, then it might be reasonable).
Until there is an official statement from the collaboration, or even one of the co-authors, this is just gossip.
Don’t get excited.
Seriously.
For more remarks, analysis, and speculation:
Not Even Wrong:
The Reference Frame:
A Quantum Diaries Survivor:
Résonaances:
Update: April 25th, 2011: “” in Nature.
ATLAS’ spokeswoman Fabiola Gianotti stops short of disowning the leaked document, but tells Nature signals
of the kind reported in the memo show up quite frequently in the course
of data analysis and are later falsified after more detailed scrutiny.
“Only official ATLAS results, i.e. results that have undergone all the
necessary scientific checks by the Collaboration, should be taken
seriously,” she says.
So my readers probably noticed the fact that this blog just stopped mid-February, without any explanation.
Life in our local part of the universe was substantially more chaotic than usual.
World wide protests, devastating natural disasters, nuclear fears, war, and us just trying to go about our day to day lives, buying a home, securing funding, getting sick, planning a wedding, all the while not looking at what was sitting just out of the corner of our eyes.
When the world is in crisis, physics doesn’t stop, science doesn’t stop.
Wars, famine, the need to rebuild – all of these are actually great motivators for researchers.
Unfortunately, most of us aren’t in fields that can actually offer anything close to intellectual assistance during these times.
There is a strange and sad fact about this planet and the animals that inhabit it though, and that is that there is always some part of the world that is in crisis.
If we took a pause every time something unimaginable to us happened, very little would ever get done.
Nevertheless, I paused.
To get back into things, here’s about a months worth of reading – there should be two other posts out later this week (back to some more serious blogging too).
gives us some updates on the
or have we ?), a silly paper on , another success for , a , a new , a long overdue , and a .
Lots of news from CERN and Fermilab in , including the , the , a
at the CMS, , the much hyped results of , and using a .
Finally in
we get a lesson on , a curious experiment , an introduction to , an update on the , an absurd paper on , and an essay from the .
, , , , , , , , , , , , , , , , , , , , , , , , , ,
By Posted:
Posts here will re-commence this week.
So I’ve been remiss in my reading lately, but here are my picks from the past few weeks.
We have , , , , , , and .
, , , , , , , , , , , , , , , , , ,
Since I didn’t have the time to put together another Valentine’s Day special, like last year’s ““, you get ‘Colour Your Own Physics Valentine’s Day Cards’ for all occasions:
The romantic
Valentine:
The platonic
Valentine:
And finally, the awkward and sexual
Valentine:
Happy Valentine’s Day
, , , , , ,
By Posted:
Just a l I’m scrambling with deadlines right now.
Astrophysics and Gravitation:
New Most Distance Galaxy Candidate Found
For more, see .
Bayesian Model to Determine Size of the Universe
Black Hole – Dark Matter Correlation? Nope.
High Energy Physics and Particles:
Measurement of the Muon Lifetime and Determination of the Fermi Constant
General Relativity, Quantum Gravity, et al.:
Virtual Black Holes in Hyperbolic Metamaterials
Gravity as a Diffeomorphism Invariant Gauge Theory
From today’s :
Geneva, 31 January 2011. CERN today announced that the LHC will run through to the end of 2012 with a
short technical stop at the end of 2011. The beam energy for 2011 will
be 3.5 TeV. This decision, taken by CERN management following the annual
planning workshop held in Chamonix last week and a report delivered
today by the laboratory’s machine advisory committee, gives the LHC’s
experiments a good chance of finding new physics in the next two years,
before the LHC goes into a long shutdown to prepare for higher energy
running starting 2014.
The LHC was previously scheduled to run to the end 2011 before going
into a long technical stop necessary to prepare it for running at its
full design energy of 7 TeV per beam. However, the machine’s excellent
performance in its first full year of operation forced a rethink.
Expected performance improvements in 2011 should increase the rate that
the experiments can collect data by at least a factor of three compared
to 2010. That would lead to enough data being collected this year to
bring tantalising hints of new physics, if there is new physics
currently within reach of the LHC operating at its current energy.
However, to turn those hints into a discovery would require more data
than can be delivered in one year, hence the decision to postpone the
long shutdown. If there is no new physics in the energy range currently
being explored by the LHC, running through 2012 will give the LHC
experiments the data needed to fully explore this energy range before
moving up to higher energy.
Phenomenally beautiful math was the main highlight of this week, I’d say, although none of it for the very faint of heart.
The , , , and
on noncommutative space(times):
, , , , , , , , , , , , , , ,
Credit: Emory and Ken Ono
So this isn’t physics*, but if you squint hard enough, you can probably make a connection.
The hot topic today is ‘s latest work on the partition function:
Ken Ono & Jan Bruinier (2011).
American Institute of Mathematics.
A EurekAlert press release appeared today, entitled:
and people are already whispering “Fields Medal”. Now, I haven’t thoroughly read the paper yet, but, since I’m not a number theorist, my commentary probably won’t change very much anyway.
Obviously, like most press releases, this one is full of hyperbole and ridiculous sentences like, “the team was determined go beyond mere theories”, but the actual work being discussed is fascinating.
, , , , , , ,
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