The decays of Higgs like particle to bbar pairs observed?
As I have explained, In TGD framework Higgs is replaced with pseudoscalar which I call Euclidian pion.
- The model predicts correctly the anomalously high decay rate of 125 GeV boson to gamma pairs if it corresponds to Euclidian pion. One obtains simpler variant of standard model Higgs mechanism in the gauge boson sector but without the hierarchy problem since Euclidian pion need not (but can) have linear couplings to fermions explaining fermion masses in standard model framework (p-adic thermodynamics therefore solves the hierarchy problem and gives also for Higgs its non-tachyonic mass in the simplest model).
- Higgs vacuum expectation characterizing coherent vacuum state results from instanton density, which is non-vanishing only in Euclidian regions of space-time surface representing lines of generalized Feynman graphs.
- In Minkowskian regions field equation imply that CP2 projection of the space-time surface is 3-D. Therefore instanton density vanishes so that M89 pion is not eaten by weak bosons. For the same reason M89 pion, which is analogous to vector particle in CP2 tangent space has only three polarizations in CP2directions so that the fourth component of pion disappears and one obtains just the 3-component pion.
- What is amazing that the new vision about Higgs like particle allows to say something highly interesting about the new E(38) boson (which of course could be fake) by simple p-adic scaling arguments (see this). By scaling back to M89 one ends up to ask whether weak bosons reside at M89 Regge trajectories with a predictable slope - as one might also expect if one accepts that they correspond to pairs of monopole magnetic flux tubes at paralle space-time sheets. Of course, these are just questions and probably its does not take too much time to answer to these questions negatively by a simple reduction ad absurdum argument.
The crucial prediction is that the couplings of Euclidian pion are induced radiatively and need not (but can) depend linearly on boson mass and can be and are expected to be smaller than for standard model Higgs. The fact that the decays to tau pairs have not been observed at LHC (see this) supports this picture but much more data is needed before one can make any conclusions.
The following three pictures represent the lowest Feynman graphs contributing to the decays of standard model Higgs, the branching ratios of Higgs to various channels, and the decay width of Higgs as a function of Higgs mass. As far decay rates are considered, the optimal choice in the attempts to observe fermionic couplings of Higgs like particle is in the case of standard model Higgs is to search for decays to b pairs. From the second figure listed above one finds that the branching ratio of standard model Higgs to b pair is more than 10 times higher than that to tau pair. This mostly due to the proportionality of the branching ratio to the square of quark mass. The ratio of bbar and ttaubar branching ratios receives from this a factor [m(b)/m(τ)]2=(4/1.7)2=6.1.
D0 Collaboration indeed claims that it has observed decays of 125 GeV Higgs candidate to bbar. The Tevatron signal is relatively weak: it only has a statistical significance of 3 sigma, much below the 5 sigma serving as a standard for discovery in absence of systematic errors. I attach the abstract of the article of D0 group below.
We combine searches by the CDF and D0 Collaborations for the associated production of a Higgs boson with a W or Z boson and subsequent decay of the Higgs boson to a bottom-antibottom quark pair. The data, originating from Fermilab Tevatron pp̅ collisions at s1/2=1.96 TeV, correspond to integrated luminosities of up to 9.7 fb-1. The searches are conducted for a Higgs boson with mass in the range 100–150 GeV/c2. We observe an excess of events in the data compared with the background predictions, which is most significant in the mass range between 120 and 135 GeV/c2. The largest local significance is 3.3 standard deviations, corresponding to a global significance of 3.1 standard deviations. We interpret this as evidence for the presence of a new particle consistent with the standard model Higgs boson, which is produced in association with a weak vector boson and decays to a bottom-antibottom quark pair.
Suppose that D0 observation is real. If the Higgs like particle is standard model Higgs, the failure to observe tau pair production could be explained as statistical fluctuation. If the Higgs like particle is Euclidian pion and its decays to fermion pairs depend only weakly on fermion mass, the decay rates to lepton pairs and lighter quark pairs should be faster than for standard model Higgs. One encounters again problem with tau pairs. My bet is that D0 observation is fake and involves delicate psychological factors such as the belief that the new particle is indeed standard model Higgs.
For obvious reasons I feel like being a dancer on the rope! Do I ever get to the other side of the abyss? Or is my fate same as that of SUSY builders and superstringers?;-)
For more details about TGD vision concerning Higgs like particle see the article.