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Bee Hossenfelder has an interesting post I'd like to get some comment on
http://backreaction.blogspot.com/2013/07/more-mysteries-in-cosmic-rays-and.html
More mysteries in cosmic rays, and a proposed solution
"...One mystery we already discussed previously. The “penetration depth” of the shower, ie the location where the maximal number of secondary particles are generated, doesn’t match expectation. It doesn’t match when one assumes that the primary particle is a proton, and Shaham and Piran argued that it can’t be matched either by assuming that the primary is some nuclei or a composite of protons and nuclei..."
http://backreaction.blogspot.com/2012/04/cosmic-ray-composition-problem.html
http://arxiv.org/abs/1204.1488
"...Now here’s an interesting new paper on the arXiv that adds another mystery. Pierre Auger sees too many muons
A new physical phenomenon in ultra-high energy collisions
Glennys R. Farrar, Jeffrey D. Allen
http://arxiv.org/abs/1307.2322 [hep-ph]
In the paper the authors go through possible explanations for this mismatch between data and our understanding of particle physics..."
"... it seems that they’re onto something and that cosmic rays are about to teach us new lessons about the structure of elementary matter."
http://backreaction.blogspot.com/2013/07/more-mysteries-in-cosmic-rays-and.html
More mysteries in cosmic rays, and a proposed solution
"...One mystery we already discussed previously. The “penetration depth” of the shower, ie the location where the maximal number of secondary particles are generated, doesn’t match expectation. It doesn’t match when one assumes that the primary particle is a proton, and Shaham and Piran argued that it can’t be matched either by assuming that the primary is some nuclei or a composite of protons and nuclei..."
http://backreaction.blogspot.com/2012/04/cosmic-ray-composition-problem.html
http://arxiv.org/abs/1204.1488
"...Now here’s an interesting new paper on the arXiv that adds another mystery. Pierre Auger sees too many muons
A new physical phenomenon in ultra-high energy collisions
Glennys R. Farrar, Jeffrey D. Allen
http://arxiv.org/abs/1307.2322 [hep-ph]
In the paper the authors go through possible explanations for this mismatch between data and our understanding of particle physics..."
"... it seems that they’re onto something and that cosmic rays are about to teach us new lessons about the structure of elementary matter."