Saturday, May 14, 2016

Higgs, top, 750 GeV II

The idea that the 750 GeV anomaly might be a top-antitop bound state has been taken to a new level by Froggatt & Nielsen, who have sketched a whole phenomenology for their particle. The reasoning is "crude" (their word), but still on a much higher plane than any mere numerology of masses.

So things may be about to get serious there. Meanwhile, I want to enumerate a few relationships which are still just numerology, but have the potential to be part of a genuine theoretical synthesis.

mH ~ mt/√2
Hvev ~ 2 mH
m375 ~ 3 mH
m750 ~ 6 mH

mH is the Higgs boson mass, mt is the top quark mass, Hvev is the Higgs field vev. m750 is the mass of the 750 GeV particle. m375 is the mass of a 375 GeV particle that Lubos may have found in the data. 

The picture I get is that the Higgs field is a top quark condensate, the 750 is a sort of loose bound state of 6 Higgs bosons (that is a "1S" toponium when analyzed at the level of quarks), and the 375 is like the 750 but with only half of the available top states occupied.

Wednesday, May 11, 2016

Higgs, top, 750 GeV

It is a long-standing idea that the Higgs might be a top-antitop bound state. (I have proposed a bootstrap version of this idea.)

My credence for that idea has just gone way up, now that I have discovered another long-standing proposal, that there might be a light bound state of 6 tops and 6 anti-tops. The number 6 appears because the top quark has two spin states and three color states, so this is the maximum number of tops in the same wavefunction that is allowed by the Pauli exclusion principle.

I had already wondered if the LHC bump at 750 GeV was somehow 6 Higgs bosons bound by top loops, since 750 GeV = 6 x 125 GeV, the Higgs mass. But if the Higgs is already a top-antitop bound state...

Friday, May 6, 2016

Proton charge radius

A new user at Physics Stack Exchange, "dandb", has made an observation which I express as follows:

"The charge radius of the proton (in muonic hydrogen) is almost exactly four times the reduced Compton wavelength of the proton."

Friday, January 22, 2016

Susy II

In some ways, the MSSM seems promising as a framework for tHWZ numerology. The reason may be seen at the end of section 3.4 in Stephen Martin's primer: susy determines the couplings of the scalar potential, in terms of coupling constants elsewhere in the theory. If I am interpreting that passage correctly, the quadratic coupling will be set by the top yukawa, and the quartic by the gauge couplings.

However, the MSSM has a lot of annoying particles like gauginos and sfermions which get in the way. Here last decade's ideas about split susy are useful. In particular, in section 2.3.3 of "Predictive Landscapes..." we read about a framework midway between split and supersplit susy, in which only the Higgsino is light. That sounds worth exploring.

Monday, January 18, 2016

H, Z, susy

I finally noticed that the Higgs mass parameter μ, 89 GeV, is very close to the Z boson rest mass, 91 GeV (and the width of the Z is a few GeV).

In the standard model, these quantities should be independent. But in the MSSM, the Z boson is the upper bound on the tree-level mass of the Higgs.

I am too tired to develop an interpretation. But tomorrow is another day.

Thursday, January 14, 2016

t, H, W, Z in 2016

Recently I have been puzzling again, over the Dharwadker-Khachatryan sum rule

mH = mW + 1/2 mZ

The problem being that it works quite well; but theory tends to favor relations among the squares of these masses (e.g. the "Veltman condition").

The primary purpose of this post is just to observe that you can get such a relation by squaring both sides of the D-K equation.

You do also get a term mW mZ. Perhaps it could result from a geometric mean, as in Torrente-Lujan.

Another simple thing that I want to observe, is that you might obtain something like D-K, by taking the square root of a Veltman-like sum rule. In other words, it could be approximately true, not by chance and not because it is directly implied by a fundamental theory, but as an algebraic side-effect of the truly fundamental relationship.

(The same applies to the Lopez-Castro - Pestieau - Garces-Doz sum rule, previously discussed here, which does involve masses squared, and therefore even more closely resembles Veltman's condition.)

P.S. Dharwadker also has a numerology for the ratio baryonic matter : dark matter : dark energy, which he deduces to be 1:5:18.

Wednesday, December 16, 2015

LHC bump

There were some events at 750 GeV, resembling a second Higgs boson. As we all know, the first Higgs boson, with a mass of 125 GeV, saturates a theoretical bound (vacuum stability), and so it is encouraging to read here of a scenario in which 750 GeV is the theoretical upper bound on the mass of a second Higgs. However, within that scenario, the upper limit is correlated with another parameter in a way that is ruled out empirically. Therefore, by numero-logic, this was a false alarm and we can all go back to sleep.