[General] light light interactions

[Andrew Meulenberg]

Dear Chandra,

I did not read the paper or analyze the announcement in detail, as you did,
so your model might still hold for this work.

It did focus your attention so that i could ask you a question "What is
your view on identical particles?"

   1. If 2 identical particles, each described by a wave function, collide
   head on, do they reflect from each other, go thru each other, neither, or
   both?
   2. Would you explain your answer?
   3. Or, is the question bad, is there insufficient information, or is the
   result just indeterminate?

How I phrase the next question depends on how you answer the above.

Andrew
_____________________________

On Mon, Aug 28, 2017 at 12:12 PM, Roychoudhuri, Chandra <
chandra.roychoudhuri at uconn.edu> wrote:

> Hello Everybody:
>
> I have again looked at the original ATLAS publication. The experiment is a
> very high energy non-linear phenomenon in the vicinity of highly charged
> Pb-atoms. As an experimental physicist in the field of optical sciences, I
> do not find the experiment as generalizable to state “light-by-light
> scattering” phenomenon. The scattering of high energy Gamma-Gamma wave
> packets, still in the vicinity of highly-charged, high energy Pb-nuclei,
> should not be generalized to incorporate the entire band of EM radiation,
> from radio, to micro, to visible, to X-ray wave packets. [See below the
> reference to the original paper.]
>
>
>
> I do find it sad that the title of the paper uses generalized expression
> “Evidence for light-by-light scattering…”; instead of calling out that it
> is a very high energy complex phenomenon. It is susceptible to subjective
> interpretations of the theory since the interaction of the parameters are
> quite complex, which are not yet all quantified very well.
>
> In the process, we are pro-actively weakening the platform of “Evidence
> based science”, which has very serious long-term re-percussions for the
> entire scientific enterprise.
>
>
>
> Of course, the technical content of the paper is scientifically beyond
> criticism. But, in the age, when the most powerful country is trying to run
> the world by “twit-headlines”; we need to be a lot more thoughtful!
>
>
>
> Chandra.
>
>
>
> https://www.nature.com/nphys/journal/vaop/ncurrent/pdf/nphys4208.pdf
>
>
>
> Evidence for light-by-light scattering in heavy-ion
>
> collisions with the ATLAS detector at the LHC
>
> ATLAS Collaboration†
>
> *Light-by-light scattering (*  !  *) is a quantum-mechanical process that
> is forbidden in the classical theory of*
>
> *electrodynamics. This reaction is accessible at the Large Hadron Collider
> thanks to the large electromagnetic field strengths*
>
> *generated by ultra-relativistic colliding lead ions. Using 480 *_*b*􀀀*1
> **of lead–lead collision data recorded at a centre-of-mass*
>
> *energy per nucleon pair of 5.02 TeV by the ATLAS detector, here we report
> evidence for light-by-light scattering. A total of 13*
>
> *candidate events were observed with an expected background of 2.6 *_ *0.7
> events. After background subtraction and analysis*
>
> *corrections, the fiducial cross-section of the process Pb*C*Pb (*  *)*!
> *Pb*._/C*Pb**(*_*)*  *, for photon transverse energy **E**T*>*3 GeV,*
>
> *photon absolute pseudorapidity *j_j<*2.4, diphoton invariant mass
> greater than 6 GeV, diphoton transverse momentum lower*
>
> *than 2 GeV and diphoton acoplanarity below*
>
>
>
> *From:* General [mailto:general-bounces+chandra.roychoudhuri=uconn.
> edu at lists.natureoflightandparticles.org] *On Behalf Of *Andrew Meulenberg
> *Sent:* Sunday, August 27, 2017 10:39 AM
> *To:* Nature of Light and Particles - General Discussion <general at lists.
> natureoflightandparticles.org>; Andrew Meulenberg <mules333 at gmail.com>
> *Cc:* robert hudgins <hudginswr at msn.com>
> *Subject:* [General] light light interactions
>
>
>
> For those who argue against light-light interactions
>
>
> http://physicsworld.com/cws/article/news/2017/aug/18/
> light-is-seen-to-scatter-off-light
>
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