Minimum Mass of a Composite Boson

Limits on the Mass of a Composite Higgs Boson

Current results from the LEP Electroweak Working Group2,3 favor a Higgs boson mass that is relatively light. The “best-fit” value for the Higgs mass is somewhat less than experimental lower bound of 107.7 GeV reported at this conference.4 The 68% and 95% CL upper bounds from precision measurements, in the context of the standard model, are 127 and 188 GeV respectively. It is possible that, as t...

Composite boson mapping for lattice boson systems.

We present a canonical mapping transforming physical boson operators into quadratic products of cluster composite bosons that preserves matrix elements of operators when a physical constraint is enforced. We map the 2D lattice Bose-Hubbard Hamiltonian into 2×2 composite bosons and solve it within a generalized Hartree-Bogoliubov approximation. The resulting Mott insulator-superfluid phase diagr...

Reheating with a composite Higgs boson

Limits on a composite Higgs boson.

Precision electroweak data are generally believed to constrain the Higgs boson mass to lie below approximately 190 GeV at 95% confidence level. The standard Higgs model is, however, trivial and can only be an effective field theory valid below some high energy scale characteristic of the underlying nontrivial physics. Corrections to the custodial isospin violating parameter T arising from inter...

Probing a composite spin-boson environment

We consider non-interacting multi-qubit systems as controllable probes of an environment of defects/impurities modelled as a composite spinboson environment. The spin-boson environment consists of a small number of quantum-coherent two-level fluctuators (TLFs) damped by independent bosonic baths. A master equation of the Lindblad form is derived for the probeplus-TLF system. We discuss how corr...