Wednesday, July 18, 2012

GOD PARTICLE

The possible discovery of the Higgs boson would not have been splashed across every major media if the tag "God particle" weren't attached to it. Physicists hate the term, but they love the publicity. There are huge government grants at stake as well as the prestige of the Large Hadron Collider at CERN in Switzerland. After you read the headline, however, there's little doubt that a general reader cannot actually grasp what a Higgs boson is (or a large hadron accelerator, either).
If you watch enough PBS programs and listen to a few physicists, some clarity emerges that a non-physicist can understand. The Higgs boson discovery adds validation to a mathematical model of force fields in the universe. It attaches a real particle to an expectation, the expectation that buried inside force fields was the key to why subatomic particles have mass. Mass would be acquired as a particle meets with resistance when it moves through the vacuum of space, a kind of "molasses" that slows it down.
This molasses is very elusive. It took many billions of colliding protons in the huge CERN accelerator, backed up by 100,000 computers around the world, to analyze the data before the discovery seemed real. Even then, most physicists are guarded about whether this new particle actually is a Higgs boson. They are equally guarded about whether its properties will uphold the Standard Model of force fields or in fact create more problems.
But behind all the hoopla and uncertainty, the news flew around the world that a basic building block of the universe has been uncovered, bringing quantum physics closer to its triumphant goal of explaining creation -- hence the inflated and rather silly label of God particle. Yet from another perspective, nothing like an explanation of the universe is emerging at all. Physics may be getting closer to the day, in fact, when the way it views the universe classically reaches a dead end.
Here we will refer to some technical matters, but stick with us. The preliminary discovery comes as a culmination of many years of both theoretical and experimental work, since 1964 when the British physicist Peter Higgs, along with Robert Brout, François Englert, Gerald Guralnik, C. R. Hagen, and Tom Kibble, hypothesized the existence of a field, filling all vacuum. They used symmetry breaking (which would allow particles to acquire their masses without violating other aspects of theory that were correct). This ubiquitous Higgs field would allow all particles in the universe to acquire mass through interactions with it, through a kind of dragging as they move in space. High energy proton collisions at the LHC should, in principle, reveal the elusive Higgs. The Higgs, unlike the photon, has a mass, expected to be in the approximate range of 125 (or more) times the mass of the proton.
The Higgs boson is the last, missing link in the highly successful quantum theory of particles, called the Standard Model. It is also highly unstable, very elusive. To detect it, one has to observe many, many high energy collisions of protons and build up the statistics. In the LHC collider, particles are accelerated through a tunnel, brought together at speeds close to the speed of light, producing showers of particles, with high energies, capable to generate the Higgs particle. It exists for only a tiny fraction of a second before breaking up into many other particles and can be detected only indirectly by identifying the results of its immediate decay and analyzing them to show they were probably produced from a Higgs boson.
Even in its lowest energy state, the Higgs field filling all vacuum has non-zero values everywhere. In fact, ripples or waves in the quantum Higgs field, create for fleeting moments the Higgs particles. The Higgs boson is itself very massive, and it must interact with itself. It itself mediates interactions with the Higgs field and is itself an excitation of the Higgs field.
The full properties of the Higgs (or whatever was observed by the teams) are not yet known. In fact, the signature of what they observed may be multiple Higgs bosons with the properties required by the next theory that the Standard Model would extend into supersymmetry.
Particle physicists are not the only ones excited by the prospect of finding the missing link in the theory: Cosmologists seem to agree that all the luminous matter in the universe makes up only 4 percent of whatever there is in the universe. All the hundreds of billions of galaxies composed of many billions of stars make up just 4 percent of everything! The rest of it may be in the form of dark matter and even more exotic (but unknown) dark energy. So if the "Higgs-like" particle discovered at CERN turns out to be more exotic form, it could help us understand at least dark energy.
These possible future developments could get us closer to what particle physicists call the Theory of Everything, a rather particle-centered view of the cosmos, because their theory of everything, as envisaged, says nothing and in fact cannot say anything about life, evolution and the phenomena of mind and awareness. It is not even clear how gravity, the last of the four forces of nature, will fit into Standard Model, developing into supersymmetry and perhaps developing into superstring theory. But it would be a start.

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