A What are the implications of a new 750GEV particle to GUTs?

[mfb]

This profile of what tiny coding errors could look like corresponds pretty closely to the kind of anomaly we see with the 750 GeV bump if it is due to systemic error and is not real.

I don't see any evidence backing up that claim. Any example in the history of particle physics? To have a realistic chance that two of them appear independently in the same way, history would have to be full of those things. I don't think I ever saw that.

Moreover, LHC investigators are very good at analyzing statistical issues in an experiment. They do it every single time. They have a protocol and a process for doing it. They have a lot of highly analogous computations to draw upon. So, the amount of statistical error is very likely to be correct.

Most of the work goes into systematic uncertainties. Particle physicists are very good at analyzing systematic uncertainties. They do it all the time.

But, an ability to make an educated guess about the kind of error involved

Then "maybe a binning effect" should not be a guess in an unbinned analysis, for example.

I'll bet that almost none of even the most savvy armchair physics analysts predicted that it was due to loose cable connections.

Correct, but a large fraction (probably the majority) expected some time measurement issue. It was immediately obvious that timing is one of the three critical points, together with the length measurement and the profile fit. An issue with the profile fit was ruled out later by the shorter bunches. There is a huge difference between "your clock synchronization could have an issue somewhere" (which happens all the time, although not always with loose cables) and "let's claim a coding error could produce a peak in the diphoton spectrum in some unspecified way, without any example or description how".

 

[zdroide]

What are the implications of a new 750GEV particle to current GUTs?

I am surprise I did not see a dark matter candidate here yet.
This should not break standard model!
There is lots more dark matter then normal matter.
If dark matter are made of particles , then there is lots more dark matter particles then normal particle or those particle are at a bigger scale.
This could explain why none of them was detected yet.
Let's imagine that this new particles , if it's one, is on the low side mass of dark matters particles.
Does current accelerator tune up for super heavy particles?
If not, then we might be missing the correct scale for them.
Is there any reason why dark matter particles could not be up and over heavy atom mass?
Why we did not see dark matters particles yet, could be only that we not look where they are. They might not be in the same scale as normal matter.

Note: By no way this should be considered as a personal theory. I am more questioning here. This particles, if is proven, look surprising heavy. Since standard model seem complete, it might be in a different field or scale. I had no idea before this particles show up of what dark matter could be made. I might be in the left field here. Did I miss something or did we miss something, that is my question.

 

[mfb]

I am surprise I did not see a dark matter candidate here yet.
This should not break standard model!

There is no undiscovered particle in the standard model, a 750 GeV particle would certainly be beyond the standard model. It is not a dark matter candidate - if it exists at all, it is very short-living.

Does current accelerator tune up for super heavy particles?

The LHC runs at the highest energy the magnets can handle, currently 13 TeV collision energy, a factor ~6 more than the Tevatron could do, the second-most high energetic collider.

Is there any reason why dark matter particles could not be up and over heavy atom mass?

Cosmology gives an approximate relation between the current dark matter density and the dark matter particle mass - something like 100 GeV is the most likely, lighter is possible, much heavier runs into problems.

It is clear that undiscovered particles are (a) very heavy or (b) couple very weakly to the known particles, otherwise we would have discovered them already. Both options are explored, (a) mainly with high-energy colliders like the LHC and (b) mainly with dedicated precision experiments.

 

[zdroide]

Cosmology gives an approximate relation between the current dark matter density and the dark matter particle mass - something like 100 GeV is the most likely, lighter is possible, much heavier runs into problems.

What else dark matter would need?
Would it been in particles form?
Some type of primordial particle?
In this case I would think of lots of stable particles of same type.
Why we not found any?
You have any idea?
Going back to this particle, it is on Susy side or multiverse?
Thank you.

 

[mfb]

Would it been in particles form?

It's hard to imagine scenarios where there are absolutely no associated particles. In quantum field theory, particles and fields are not different things, you can't have one without the other.

Some type of primordial particle?

That is the most likely case.

Why we not found any?

They don't interact via the electromagnetic or strong interaction, which makes them hard to find.

Going back to this particle, it is on Susy side or multiverse?

That question does not make sense. There is no "SUSY side" and no "multiverse side".

 

[kodama]

rumor is its a statistical bump. no word on SUSY