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Keyword: standardmodel

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  • The Vast and the Tiny (John Derbyshire)

    05/31/2013 11:54:04 AM PDT · by neverdem · 3 replies
    American Spectator ^ | May 2013 | John Derbyshire
    On galaxies and bosons, stars and quarks. In physics, truth does not always equal beauty. The Milky Way: An Insider’s Guide By William H. Waller (Princeton University Press, 296 pages, $29.95) A Palette of Particles By Jeremy Bernstein (Belknap Press of Harvard University, 224 pages, $18.95) THE BRITISH PHILOSOPHER J.L. Austin coined the handy phrase “medium-sized dry goods” to describe the world of everyday phenomena that the human nervous system is best suited to cope with, phenomena ranging in size from a grain of dust to a landscape. Within that range our senses and cognition are at home. All our...
  • Higgs Boson Positively Identified

    03/15/2013 12:12:53 AM PDT · by neverdem · 30 replies
    ScienceNOW ^ | 14 March 2013 | Adrian Cho
    Enlarge Image Plainly. An event display shows a Higgs candidate decaying to four electrons in the ATLAS detector. New measurements confirm that the Higgs is a Higgs. Credit: ATLAS Collaboration/CERN Eight months ago, physicists working with the world's biggest atom smasher—Europe's Large Hadron Collider (LHC)—created a sensation when they reported that they had discovered a particle that appeared to be the long-sought Higgs boson, the last missing piece in their standard model of particles and forces. Today, those researchers reported that the particle does indeed have the basic predicted properties of the standard model Higgs boson, clinching the identification....
  • As Supersymmetry Fails Tests, Physicists Seek New Ideas

    11/29/2012 3:10:46 PM PST · by neverdem · 32 replies
    Simons Science News ^ | November 20, 2012 | Natalie Wolchover
    No hints of “new physics” beyond the predictions of the Standard Model have turned up in experiments at the Large Hadron Collider, a 17-mile circular tunnel at CERN Laboratory in Switzerland that slams protons together at high energies. (Photo: CERN) As a young theorist in Moscow in 1982, Mikhail Shifman became enthralled with an elegant new theory called supersymmetry that attempted to incorporate the known elementary particles into a more complete inventory of the universe.“My papers from that time really radiate enthusiasm,” said Shifman, now a 63-year-old professor at the University of Minnesota. Over the decades, he and thousands of...
  • At Long Last, Physicists Discover Famed Higgs Boson

    07/12/2012 12:46:07 PM PDT · by neverdem · 35 replies
    ScienceNOW ^ | 4 July 2012 | Adrian Cho
    Enlarge Image Twin peaks. Both the CMS (top) and the ATLAS (bottom) detectors see evidence of the Higgs boson decaying into a pair of photons in the form of a peak in a so-called mass plot. The agreement of the two peaks and other data clinch the discovery of the Higgs. Credit: CMS and ATLAS collaborations MEYRIN, SWITZERLAND—The long wait is over. Today, physicists working with the world's largest atom smasher here at the European particle physics laboratory, CERN, reported that they have discovered the long-sought Higgs boson—the last missing bit in their standard model of fundamental particles and...
  • Physics: Proton radius smaller than believed, European scientists say

    07/07/2010 9:06:34 PM PDT · by smokingfrog · 118 replies · 3+ views
    LA Times ^ | July 7, 2010 | Thomas H. Maugh II
    Sophisticated measurements from experiments indicate the radius is 4% smaller than thought. If true, the finding could have major ramifications for the standard model used in modern physics. Physicists might have to rethink what they know about, well, everything. European researchers dropped a potential bombshell on their colleagues around the world Wednesday by reporting that sophisticated new measurements indicate the radius of the proton is 4% smaller than previously believed. In a world where measurements out to a dozen or more decimal places are routine, a 4% difference in this subatomic particle — found in every atom's nucleus — is...
  • Fermilab Experiment Hints At Multiple Higgs Particles

    06/15/2010 9:41:08 PM PDT · by dila813 · 40 replies · 775+ views
    Slashdot ^ | Today | so-many-particles-mister-fermi dept.
    "Recent results from the Dzero experiment at the Tevatron particle accelerator suggest that those looking for a single Higgs boson particle should be looking for five particles, and the data gathered may point to new laws beyond the Standard Model. 'The DZero results showed much more significant "asymmetry" of matter and anti-matter — beyond what could be explained by the Standard Model. Bogdan Dobrescu, Adam Martin and Patrick J Fox from Fermilab say this large asymmetry effect can be accounted for by the existence of multiple Higgs bosons. They say the data point to five Higgs bosons with similar masses...
  • Physicists get closer to finding the 'God Particle'

    03/13/2009 8:04:31 PM PDT · by NormsRevenge · 77 replies · 2,200+ views
    AFP on Yahoo ^ | 3/13/09 | AFP
    CHICAGO (AFP) – Physicists have come closer to finding the elusive "God Particle," which they hope could one day explain why particles have mass, the US Department of Energy's Fermi National Accelerator Laboratory announced Friday. Researchers at the Fermilab have managed to shrink the territory where the elusive Higgs Boson particle is expected to be found -- a discovery placing the American research institute ahead of its European rival in the race to discover one of the biggest prizes in physics. Physicists have long puzzled over how particles acquire mass. In 1964, a British physicist, Peter Higgs, came up with...
  • Standard model gets right answer for proton, neutron masses

    11/22/2008 10:22:32 PM PST · by neverdem · 20 replies · 1,653+ views
    Science News ^ | November 20th, 2008 | Ron Cowen
    Correct calculation strengthens theory of quark-gluon interactions in nuclear particles When it comes to weighty matters, quarks and gluons rule the universe, a new study confirms. One of the largest computational efforts to calculate the masses of protons and neutrons shows that the standard model of particle physics predicts those masses with an uncertainty of less than 4 percent. Christian Hoelbling, affiliated with the Bergische Universtät Wuppertal in Germany, the Eötvös University in Budapest and the CNRS in Marseille, France, and his colleagues report their findings in the Nov. 21 Science. Nearly all the mass of ordinary matter consists of...
  • Physicists capture image of elusive neutrinos

    11/06/2007 8:58:29 AM PST · by SunkenCiv · 9 replies · 88+ views
    Cosmos Magazine ^ | Wednesday, October 24, 2007 | Agence France-Presse
    European physicists have sent a neutrino on a 730-kilometre trip under the Earth's crust and taken a snapshot of the instant it slammed into lab detectors... In 2006, CERN started beaming neutrinos from its accelerator complex near Geneva, and have so far detected several hundred impacts in San Grasso. But the scientists have now taken the venture a step forward by starting to fill the San Grasso detector with small film plates which measure with high accuracy the cascade of particles that are produced when a neutrino impacts. These plates, called bricks, are each made of a sandwich of lead...
  • No sign of the Higgs boson

    04/10/2007 8:48:56 AM PDT · by SunkenCiv · 7 replies · 422+ views
    New Scientist ^ | December 5, 2001 (note the year) | Eugenie Samuel
    From the masses and interactions of other particles that we know exist, physicists calculated that the Higgs is most likely to have a mass (or energy) of around 80 gigaelectronvolts (GeV). If particle accelerators smash particles together at that energy or higher, it should be possible to make one. This is what members of the Electroweak Working Group at CERN were doing for the 5 years until LEP (the Large Electron Positron Collider) closed down last year. Since then they've been sifting through the data they gathered--and found nothing. They rule out most possible masses for the Higgs, including the...
  • Light shed on mysterious particle

    03/31/2006 6:04:35 AM PST · by The_Victor · 83 replies · 1,321+ views
    BBC ^ | 3/31/2006 | Rebecca Morelle
    Physicists have confirmed that neutrinos, which are thought to have played a key role during the creation of the Universe, have mass. This is the first major finding of the US-based Main Injector Neutrino Oscillation Search (Minos) experiment. The findings suggest that the Standard Model, which describes how the building blocks of the Universe behave and interact, needs a revision. Neutrinos are believed to be vital to our understanding of the Universe. But scientists know frustratingly little about these fundamental particles. The findings build on work carried out by Japanese physicists. Different 'flavours' Neutrinos are sometimes described as "ghost particles"...
  • 'God particle' may have been seen

    03/11/2004 4:45:23 AM PST · by Momaw Nadon · 123 replies · 732+ views
    BBC News Online ^ | Wednesday, 10 March, 2004 | By Paul Rincon
    A scientist says one of the most sought after particles in physics - the Higgs boson - may have been found, but the evidence is still relatively weak. Peter Renton, of the University of Oxford, says the particle may have been detected by researchers at an atom-smashing facility in Switzerland. The Higgs boson explains why all other particles have mass and is fundamental to a complete understanding of matter. Dr Renton's assessment of the Higgs hunt is published in Nature magazine. "There's certainly evidence for something, whether it's the Higgs boson is questionable," Dr Renton, a particle physicist at Oxford,...