Possible new Boson at 750 GEV?

[Sorcerer]

I was just reading this article: LHC sees hint of boson heavier than Higgs and while browsing stumbled on this article shortly afterwards: Recent study predicts that Higgs particles are much heavier than earlier observation .

What's the likelihood that the possible particle is just a second Higgs? How does this effect the standard model. If it's not another Higgs, and is confirmed to exist, what are possible theoretical candidates which could account for the particle.

If it's something completely new, what could it be and how could it effect our current models?

[Mordred]

Supersymmetry has proposed various other Higgs mass particles. Though they also predict other heavier particles as well.

 

A heavier form of Higgs will allow fine tuning of the seesaw mechanism. There is numerous variations of the SO (10) MSSM model. Having more than one Higgs will support a double seesaw model instead of the current single seesaw.

 

There are several multi seesaw models under SO (10) MSSM.

 

However we haven't confirmed the spin statistics of this particle as far as I know. For a Higgs particle it must be spin zero

Edited July 9, 2016 by Mordred

[ajb]

Fingers crossed that it is something to do with SUSY.

[Mordred]

Fingers crossed that it is something to do with SUSY.

I fully agree

 

However it would be even more groundshaking if it turns out to have spin 2. Spin 1 is ruled out by the diphoton production.

 

here is a paper looking at spin 0 and spin 2.

 

http://www.google.ca/url?sa=t&source=web&cd=1&ved=0ahUKEwjS9NLk7ebNAhVS6mMKHTwQBqcQFggbMAA&url=http%3A%2F%2Farxiv.org%2Fpdf%2F1603.03421&usg=AFQjCNFDa4JmXA_DR6l2WgcoXWwQtYSkqw&sig2=WA3Cd7B5Iu8rcwkW2wWwFA

Edited July 9, 2016 by Mordred

[ajb]

Spin-2 I think is unlikely - we know from very general arguments that spin-2 has to be a gravition. Such a thing at this energy may suggest large extra dimensions and whatnot.

[Mordred]

Sounds like your referring to the Randall-Sundrum gravitons. Estimates for graviton mass has always been funky.

[ajb]

Sounds like your referring to the Randall-Sundrum gravitons. Estimates for graviton mass has always been funky.

Yes something like that - but of course the mass is always an issue. For sure s spin-2 massive particle would be rather odd and exciting.

[Mordred]

Yes something like that - but of course the mass is always an issue. For sure s spin-2 massive particle would be rather odd and exciting.

Oh definetely the bound for the coupling of the Kaluza-Klien graviton is roughly 1 Tev. The Randall Sundrum raised the initial lower bound. If I remember correct its roughly 475 Gev/c^2 and 900 something Gev/c^2.

 

Been a few months since I last read the Randall paper

[ajb]

I think the range you have given is okay - so from my very little knowledge of phenomenology 750 GeV is within the possible range. But lets wait an see

[Mordred]

Definetely as more data is needed to avoid Speculations.

[Sorcerer]

What would a 2nd Higgs mean, would it change much? Would two Higgs fields create two types of Mass? Could a heavier higgs particle imbue some particles in its field with more mass than a lighter one?

You're still optimistic about SUSY Mordred? The article said this about it:

 

 

Supersymmetry shortfall

Meanwhile, searches for particles predicted by supersymmetry, physicists' favourite extension of the standard model, continue to come up empty handed. To theoretical physicist Michael Peskin of the SLAC National Accelerator Laboratory in Menlo Park, California, the most relevant part of the talks concerned the failure to find a supersymmetric particle called a gluino in the range of masses up to 1,600 GeV (much farther than the 1,300-GeV limit of run 1). This pushes supersymmetry closer to the point at which many physicists might give up on it, Peskin says.

That doesn't worry you?

However we haven't confirmed the spin statistics of this particle as far as I know. For a Higgs particle it must be spin zero

 

Could it be a fermion like the Majorana fermion then?

Sorry I'll list my questions.

1. could you briefly describe in laymens terms the see saw mechanism and why a 2nd higgs will fine tune it?

2. Do any other bosons have fields which decay in to their respective particle of 2 seperate weights. What kind of field would a dual Higgs field create and how might that effect mass?
3. Are you still hopeful for SUSY even though there was lack of data confirming the existence of the Gluino?
4. Is the Majorana fermion a candidate? What would that mean?

Definetely as more data is needed to avoid Speculations.

Come on, speculations are the fun part.

[Mordred]

no it doesn't worry me. The energy levels needed to create supersymmetric particles has always been known to be extreme.

 

However as our tech improves were getting closer. A few years ago we wouldn't even dream of producing a 125 Higgs. Now we produced a much higher Gev particle.

 

A supersymmetric Higgs will allow the supersymmetric particle symmetry breaks.

 

the 246 Vev (vacuum expectation value only correlates the 125 Higgs.

 

the Higgs inflation model works better under the MSSM model. So finding a Susy particle could go a long way to solving inflation.

 

particle guage groups have a history of predicting particles long before their discovery.

 

A decade ago most scientists denied the Higgs field for the same reasons presented in your last quote. Same with diquarks and pentaquarks. Which were now discovering

Edited July 9, 2016 by Mordred

[Sorcerer]

Can you clarify, are you saying if the 750GeV particle is a Higgs Boson, then it is possibly one half of the super symmetric pair, with the 125 GeV Higgs being the other?

 

 

The Higgs boson mass of the Standard Model is unstable to quantum corrections and the theory predicts that weak scale should be much weaker than what is observed to be. In the MSSM, the Higgs boson has a fermionic superpartner, the Higgsino, that has the same mass as it would if supersymmetry were an exact symmetry. Because fermion masses are radiatively stable, the Higgs mass inherits this stability. However, in MSSM there is a need for more than one Higgs field, as described below.

 

wiki is confusing me, are you saying it could be the Higgsino, or is it the "more than one Higgs field"?

[Mordred]

It could be the Higgsino. Susy treats fields considerably different than SM. For example in SO (10) there is 16 fermionic fields. The number of possible particles will be doubled.

 

the standard model of particles has several difficulties. Right hand neutrinos. lepton and baryogenises. Dark matter, the cosmological constant. Inflation.

 

Little known is the 1/3 charge also presents difficulties which SO (5) better describes.

SO(3)×SO(2)×U(1) SM also doesn't include Pati-Salam which details right handed and left handed. Thats contained as a subgroup of SO (10).

 

The added Higgs bosons will add different field components. Additional interactions or degrees of freedom. Rather than a seperate field.

 

I have a decent article covering Gut under the SM,SO (5) and SO (10).

 

I'll let you read that and post several proposals SO (10) may solve.

GUT theories

 

http://arxiv.org/pdf/0904.1556.pdf The Algebra of Grand Unified Theories John Baez and John Huerta

http://pdg.lbl.gov/2011/reviews/rpp2011-rev-guts.pdf

http://pdg.lbl.gov/2011/reviews/rpp2011-rev-guts.pdf GRAND UNIFIED THEORIES

 

DARK MATTER AS STERILE NEUTRINOS

 

http://arxiv.org/abs/1402.4119

http://arxiv.org/abs/1402.2301

http://arxiv.org/abs/1306.4954

 

Higg's inflation possible dark energy

 

http://arxiv.org/abs/1402.3738

http://arxiv.org/abs/0710.3755

http://arxiv.org/abs/1006.2801

 

lol I recall one 800+page dissertation that showed the math for a possible 16 different Higgs masses. If that can be believed. mainly little Higgs. Most of those mass values were well in our detection range.

 

Keep in mind its even possible for this to even be one of the additional Bosons predicted by Susy.

Edited July 9, 2016 by Mordred