Muon g-2

Obviously the big thing this week is the new measurement of the anomalous magnetic moment of the muon, at Fermilab.

I’ve written about this experiment a few times before, see these articles. I haven’t had time to write anything about the new result yet, and maybe I will now wait until the dust settles a bit. I did talk to Ian Taylor at BBC Science Focus, and he wrote that up as a Bluffer’s Guide”, which you might find useful and/or interesting.

The magnet arriving, somewhat portentiously, at Fermilab in 2013 Photograph: Fermilab
The magnet arriving, somewhat portentiously, at Fermilab in 2013 Photograph: Fermilab

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A growing anomaly

The LHCb experiment at the CERN Large Hadron Collider (LHC) today released an update of a measurement that many of us physicists have been keeping a close eye on for quite some time.

At the Cosmic Shambles Network

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War Poetry

The marching band came down along Main Street
The soldier blues fell in behind

O it was sad enough, weak enough, mad enough,
Light in their loving as soldiers can be.
First to risk choosing them, leave alone losing them
Now, in far battle, beyond the South Sea!

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Leptons Four the Win

This was a labour of love… (arXiv)

The four-lepton mass distribution

ATLAS measurement, in 13TeV proton-proton collisions, of the differential cross section as a function of the four-lepton mass

I wrote about an earlier version of this measurement here. We have now measured the distribution with the full data set from the highest energy (13TeV) collisions that we have so far. There was also quite a lot of work involved in making the measurement (even) more model-independent, and testing the statistical treatment of the various way in which it can be (re)interpreted.

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