Posts Tagged ‘particles’

ATLAS and CMS publish observations of a new particle in the search for the Higgs boson

September 12, 2012 Leave a comment

10 September 2012

The ATLAS and CMS experiments at CERN today published observations of a new particle in the search for the Higgs boson in the journal Physics Letters B.

The papers: “Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC” and “Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC” are freely available online on ScienceDirect.

“These papers present the first observations of a new particle discovered by two big experiments at the Large Hadron Collider (LHC) in the search for the Standard Model Higgs boson which has spanned many decades and has involved many experiments,” says CMS spokesperson Joe Incandela. “They are the most important papers to come from the LHC so far and the findings are key to the field of particle physics. We are very pleased to see them published in Physics Letters B, accessible to all who may want to read them.”

Read more:

Higgs boson: scientists 99.999% sure ‘God Particle’ has been found

July 4, 2012

Scientists believe they have captured the elusive “God particle” that gives matter mass and holds the physical fabric of the universe together.

 A graphic showing traces of two high-energy photons measured at Cern - A quantum leap

A graphic showing traces of two high-energy photons measured at Cern Photo: GETTY

The historic announcement came in a progress report from the Large Hadron Collider particle accelerator.

Professor John Womersley, chief executive of the Science and technology Facilities Council, told reporters at a briefing in London: “They have discovered a particle consistent with the Higgs boson.

“Discovery is the important word. That is confirmed. It’s a momentous day for science.”

Scientists say it is a 5 sigma result which means they are 99.999% sure they have found a new particle.

Finding the Higgs plugs a gaping hole in the Standard Model, the theory that describes all the particles, forces and interactions that make up the universe.

Read more:

Tantalizing Signs of Higgs Boson Found By U.S. Tevatron Collider

By Rebecca Boyle Posted 07.02.2012

If the Tevatron was a metal detector sweeping across a proverbial beach, the beeps of discovery would have been coming in very close succession at the end of its life. It was, we have learned, extremely close to finding the treasured Higgs boson … and then, last September, it shut down. Only another, more powerful detector, owned by someone else, will finally be able to grab it.

God particle is ‘found’: Scientists at Cern expected to announce on Wednesday Higgs boson particle has been discovered

July 2, 2012

  • Scientists ‘will say they are 99.99% certain’ the particle has been found
  • Leading physicists have been invited to event – sparking speculation that Higgs Boson particle has been found
  • ‘God Particle’ gives particles that make up atoms their mass

PUBLISHED: 14:00, 1 July 2012 | UPDATED: 14:41, 1 July 2012

Scientists at Cern will announce that the elusive Higgs boson ‘God Particle’ has been found at a press conference next week, it is believed.

Five leading theoretical physicists have been invited to the event on Wednesday – sparking speculation that the particle has been discovered.

Scientists at the Large Hadron Collider are expected to say they are 99.99 per cent certain it has been found – which is known as ‘four sigma’ level.

Big enough to matter: The collider, formed of superconducting magnets, stretches around 17miles or 27km - and is sensitive to the moon's gravityThe particle accelerator: It is within these tubes that physicists are hunting for the ‘God’ particle

Read more:

In New Quantum Experiment, Effect Happens Before Cause

By Paul Adams Posted 04.24.2012 at 5:14 pm
Four Particles Jon Heras, Equinox Graphics Ltd.

A real-world demonstration of a thought experiment conducted at the University of Vienna, has produced a result that is somewhat befuddling to people with what the lead researcher calls a “naïve classical world view.” Two pairs of particles are either quantum-entangled or not. One person makes the decision as to whether to entangle them or not, and another pair of people measure the particles to see whether they’re entangled or not.

The head-scratcher is: the measurement is made before the decision is made, and it is accurate. “Classical correlations can be decided after they are measured,” says Xiao-song Ma, the writer of the study. Entanglement can be created “after the entangled particles have been measured and may no longer exist.”

The finding can be integrated into potential quantum computers, one hopes. Causality, clearly, is a quaint, irrelevant concept.


For the First Time, Electrons are Observed Splitting into Smaller Quasi-Particles

By Clay Dillow Posted 04.19.2012 at 1:34 pm

An Electron Splitting In Two David Hilf, Hamburg via PhysOrg

We generally think of electrons as fundamental building blocks of atoms, elementary subatomic particles with no smaller components to speak of. But according to Swiss and German researchers reporting in Nature this week, we are wrong to think so. For the first time, the researchers have recorded an observation of an electron splitting into two different quasi-particles, each taking different characteristics of the original electron with it.

Using samples of the copper-oxide compound Sr2CuO3, the researchers lifted some of the electrons belonging to the copper atoms out of their orbits and placed them into higher orbits by manipulating them with X-rays. Upon placing them in these higher–and higher-velocity–orbits, the electrons split into two parts, one called a spinon that carried the electron’s spin with it, and another called an obitron that carried the electron’s orbital momentum with it.

 Spin and orbit are–at least as our basic understanding goes–attached to each particular electron. So the fact that they have been separated is pretty significant. And while researchers have thought for a while that this kind of separation could be theoretically achieved, they’ve had a hard time proving it empirically until now. It’s a reminder that at the quantum level there are still things that more or less mystify us.

 But that’s not all it is. This particular observation of an electron splitting could have big-time implications in the field of high-temperature superconductivity. Understanding the way electrons can decay into quasi-particles could improve our overall understanding of the electron and how it moves, and thus help us figure out new ways of moving electrons–or electricity–around in bulk without losing large amounts of it as waste.