[Paper Review] The New Dijet Particle in the Tevatron IS the Higgs

H. B. Nielsen|arXiv (Cornell University)|Apr 24, 2011

Particle physics theoretical and experimental studies42 references3 citations

TL;DR

This paper proposes that the recently observed dijet resonance at 144 GeV in Tevatron data is actually the Standard Model Higgs boson, decaying dominantly into a very light, strongly coupled bound state of six top quarks and six anti-top quarks. This bound state, stabilized by the Multiple Point Principle and tuned to near-zero mass, decays into hadronic jets, mimicking a dijet decay and explaining the observed peak despite suppressed standard $b\bar{b}$ decay rates.

ABSTRACT

The newly found \cite{CDFnew} dijet peak in the 120 GeV to 160 GeV mass region produced in co-production with W IS actually a Higgs Boson in spite of the expectation of a different decay pattern for most Higgses. Our point, however, is that the bound state of 6t + 6$\bar{t}$, which we have put forward already in several articles \cite{boundfirst}\cite{bound} \cite{dark}\cite{hierarchybound}, easily could be lighter - possibly much lighter - than half the Higgs mass. Higgs would in this case decay dominantly to two of our bound states. If these bound states were indeed very light (say around 10 GeV) their decay products into hadrons would like two jets, one for each bound state. Even a very small mass for our bound state is not unexpected isofar as it is part of our model that especially the top-quark-Yukawa coupling is being tuned so as to make precisely this bound state of $6t + 6\bar{t}$ become (approximately) massless. This tuning is a consequence of our Multiple Point Principle \cite{old} \cite{SIMPP} which states that the realized parameter/coupling values correspond to having a maximal set of degenerate vacua. Even the very recent LHC-peak in photon photon might be fitted to our model.

Motivation & Objective

• To explain the observed 144 GeV dijet resonance in Tevatron data as a Higgs boson decay, despite its apparent inconsistency with standard $b\bar{b}$ decay rates.
• To argue that a bound state of six top quarks and six anti-top quarks can be light due to fine-tuning via the Multiple Point Principle (MPP), enabling dominant Higgs decay into dijets.
• To reconcile the observed cross-section and peak width with a Higgs boson that decays predominantly into this light bound state, rather than $b\bar{b}$ or $W$-boson modes.
• To show that the Higgs decay width and branching ratio can be significantly enhanced via strong coupling to the $6t+6\bar{t}$ bound state, explaining the observed signal strength.

Proposed method

• Postulate a $6t+6\bar{t}$ bound state stabilized by Higgs and gluon exchange, with mass tuned to near zero via the Multiple Point Principle (MPP).
• Use MPP to justify fine-tuning of the top-Yukawa coupling such that the vacuum energy degeneracy includes a state with a Bose condensate of the $6t+6\bar{t}$ bound state.
• Model the Higgs decay into a pair of these light bound states, which then decay into hadronic jets, mimicking a dijet final state.
• Estimate the branching ratio enhancement by comparing the coupling strength of the bound state channel (order unity) to the $b\bar{b}$ channel (proportional to $g_b^2 \approx 1/900$).
• Propose that the observed 4 pb cross-section peak arises from Higgs decays into the $6t+6\bar{t}$ bound state pair, not $b\bar{b}$, due to dominant branching ratio.
• Suggest a loop correction via a related resonance (400–800 GeV) involving $W$ bosons and the light bound state, enhancing the effective $WWH$ vertex and Higgs production rate.

Experimental results

Research questions

• RQ1 Can the observed 144 GeV dijet peak in Tevatron data be explained as the Higgs boson decaying into a light, strongly coupled $6t+6\bar{t}$ bound state?
• RQ2 How does the Multiple Point Principle (MPP) enable the $6t+6\bar{t}$ bound state to be nearly massless, despite the top quark mass?
• RQ3 Why is the $b\bar{b}$ decay mode suppressed in this model, and how does this affect the observed cross-section and branching ratio?
• RQ4 Could the broad mass peak (120–160 GeV) reflect the true Higgs width rather than experimental uncertainty?
• RQ5 Is it possible to explain the observed Higgs production rate in $W$-associated production without new physics, using only the Standard Model with the $6t+6\bar{t}$ bound state?

Key findings

• The Higgs boson decays dominantly into a pair of $6t+6\bar{t}$ bound states, which then decay into hadronic jets, explaining the observed dijet peak.
• The branching ratio into the $6t+6\bar{t}$ bound state pair is estimated to be approximately 900 times larger than into $b\bar{b}$, due to the suppression of the bottom-Yukawa coupling.
• The observed cross-section of ~4 pb is consistent with Higgs production if the branching ratio into the bound state pair is dominant, despite the standard model prediction being ~0.1 pb.
• The peak width from 120 to 160 GeV may reflect the true Higgs width in this model, rather than experimental resolution.
• The model predicts a related resonance in the 400–800 GeV range that could enhance the $WWH$ vertex via loop diagrams involving the light bound state.
• The model is purely within the Standard Model framework, with no new fields, relying only on fine-tuned couplings enforced by the Multiple Point Principle.