• 2009 TopCites: 50 most-cited articles in high-energy physics

    Updated: 2010-03-08 10:02:44
    As usual, the Particle Data Group's "Review of Particle Physics" tops the 2009 list of the most-cited papers. The rest of the Top Ten is composed of papers in observational strophysics and cosmology as well as now-classic string theory papers.

  • Some recent posts you might want to read

    Updated: 2010-03-06 14:50:53
    As the less distracted among you know, I have moved my blogging activities to scientific blogging last April. I wish to report here a list of interesting posts I have produced there in the course of the last few months (precisely, since the start of 2010). They are given in reverse chronological order and with [...]

  • Exotic antimatter detected at RHIC

    Updated: 2010-03-05 19:04:31
    Scientists report discovery of the heaviest known antinucleus and the first antinucleus containing an anti-strange quark. The discovery opens new dimensions in the nuclear chart and may have unprecedented consequences for our view of the world.

  • First Neutrino Seen at Super-K, 295km from the T2K Beam Origin at J-PARC

    Updated: 2010-03-05 00:09:00
    : , skip to main skip to sidebar Experimental Particle Physicists at Imperial College London Undergraduate and Postgraduate students , Research Associates and Staff at the Imperial College London High Energy Physics Group . everyone is invited to add comments 05 March 2010 First Neutrino Seen at Super-K , 295km from the T2K Beam Origin at J-PARC Post by Yoshi This is the first neutrino created at the J-PARC laboratory , and sent across from the eastern coast of Japan , that was seen by the Super-Kamiokande detector , 295km . away The picture shows the inside of the Super-K experiment , which is a vertical cylinder , filled with water , 40 metres high and a kilometre underground . The band in the middle is the side of the unfolded cylinder , and the two black circles are the top and bottom . The coloured blobs show the particles of light that were seen by the photon detectors that cover the inside of the cylinder , and the colours depend on the time when the light arrived . there The rings that you can see formed by the coloured blobs are from the Sonic Booooum of light that made by the the particles that are created by the neutrino in Super-K . There are three rings the first two

  • Sky-wide neutrino search seeks supernovae in our backyard

    Updated: 2010-03-04 22:02:20
    In order to catch a supernova with a telescope, scientists need to peer in the right direction at the right time. By using machines built for particle physics, however, scientists can scour the entire sky at once.

  • Understanding Muon Decay

    Updated: 2010-03-04 21:41:47
    Yesterday somebody asked me here if I could explain how does a muon really decide when and how to decay. I tried to answer this question succintly in the thread, and later realized that my answer, although not perfectly correct in the physics, was actually not devoid of some didactic power. So I decided to recycle it and make it the subject of an independent post. Before I come to the discussion of how, exactly, does a muon choose when and how to decay, however, let me make a few points about this fascinating particle, by comparing its phenomenology to that of the electron. read more

  • Newswire: BNL - Exotic Antimatter Detected at Relativistic Heavy Ion Collider (RHIC)

    Updated: 2010-03-04 06:00:00
    Scientists report discovery of heaviest known antinucleus and first antinucleus containing an anti-strange quark, laying the first stake in a new frontier of physics UPTON, NY - An international team of scientists studying high-energy collisions of gold ions at the Relativistic Heavy Ion Collider (RHIC -- http://www.bnl.gov/rhic/), a 2.4-mile-circumference particle accelerator located at the U.S. Department of Energy's (DOE) Brookhaven National Laboratory, has published evidence of the most massive antinucleus discovered to date. The new antinucleus, discovered at RHIC's STAR detector (http://www.bnl.gov/rhic/STAR.asp), is a negatively charged state of antimatter containing an antiproton, an antineutron, and an anti-Lambda particle. It is also the first antinucleus containing an anti-strange quark. The results will be published online by Science Express on March 4, 2010.

  • Deep underground science: new issue of symmetry out today

    Updated: 2010-03-03 20:20:16
    The new issue of symmetry features stories about plans for a US deep underground science and engineering laboratory, taking clean equipment to an extreme in the Enriched Xenon Observatory in a salt deposit in New Mexico, the trial faced by the earthquake-stricken Abruzzo region and the Gran Sasso laboratory in Italy, the search for "dark life", and a day in the life of the Soudan underground lab in Minnesota.

  • Top quark turns 15 today

    Updated: 2010-03-02 16:38:36
    March 2, 2010, marks the 15th anniversary of the day that Fermilab announced the discovery of the top quark by the CDF and DZero experiments.

  • Astronomically large lenses measure the age and size of the universe

    Updated: 2010-03-01 17:33:13
    Using entire galaxies as lenses to look at other galaxies, researchers have a newly precise way to measure the size and age of the universe and how rapidly it is expanding, on par with other techniques. The measurement determines a value for the Hubble constant, which indicates the size of the universe, and confirms the age of the universe as 13.75 billion years old, within 170 million years. The results also confirm the strength of dark energy, responsible for accelerating the expansion of the universe.

  • First protons of 2010 circulate in LHC

    Updated: 2010-02-28 00:06:22
    Yesterday just before 11:25 p.m. Central European Time, the first protons of 2010 were injected in the Large Hadron Collider. By 4:10 a.m. this morning, beams had circulated hundreds of times in both directions around the 27-kilometer ring. Over the next few weeks, the beams will be increased in energy from 450 GeV towards 3.5 TeV as the first long run of the LHC gets underway.

  • First T2K neutrino event observed at Super-Kamiokande

    Updated: 2010-02-25 16:30:59
    Physicists from the Japanese-led multinational T2K collaboration announced today that they had made the first detection of a neutrino which had travelled all the way under Japan from their neutrino beamline at the J-PARC facility in Tokai village (about an hour north of Tokyo by train) to the gigantic Super-Kamiokande underground detector near the west coast of Japan, 295 km (185 miles) away from Tokai.

  • Newswire: KEK - The First T2K Neutrino Event Observed at Super-Kamiokande

    Updated: 2010-02-25 06:00:00
    Tsukuba, February 24, 2010. Physicists from the Japanese-led multinational T2K collaboration announced today that they had made the first detection of a neutrino which had travelled all the way under Japan from their neutrino beamline at the J-PARC facility in Tokai village (about an hour north of Tokyo by train) to the gigantic Super-Kamiokande underground detector near the west coast of Japan, 295 km (185 miles) away from Tokai.

  • Are Quarks And Leptons Elementary Or Composite ?

    Updated: 2010-02-21 22:14:35
    There are twenty-four elementary fermions in the standard model. Sure, they are arranged in a very tidy, symmetrical structure of three families of eight fermions (two leptons and six quarks), which is not too unpleasant to behold. And of course, if one is willing to forget the fact that the quantum-chromodynamical charge of quarks does make them different, then the picture is even tidier: 12 fermions, six of them quarks and six of them leptons, arranged in three families of four. read more

  • Newswire: March 2: Fermilab invites reporters to Large Hadron Collider orientation and overview of future laboratory plans

    Updated: 2010-02-18 06:00:00
    Batavia, Ill. - The Large Hadron Collider at CERN in Geneva, Switzerland has reached record-breaking energies, but that doesn't mean it's time to close up shop at the Department of Energy's Fermi National Accelerator Laboratory. Find out what's next for the premier particle physics laboratory in the U.S. and get your LHC questions answered at a two-hour Q&A session with LHC and Fermilab scientists on Tuesday, March 2, from 1-3 p.m. in Wilson Hall. Reporters will also have the opportunity to tour the LHC Remote Operations Center at Fermilab.

  • Newswire: Brookhaven National Laboratory - 'Perfect' Liquid Hot Enough to be Quark Soup

    Updated: 2010-02-15 15:40:00
    Protons, neutrons melt to produce quark-gluon plasma at RHIC UPTON, NY -- Recent analyses from the Relativistic Heavy Ion Collider (RHIC), a 2.4-mile-circumference "atom smasher" at the U.S. Department of Energy's (DOE) Brookhaven National Laboratory, establish that collisions of gold ions traveling at nearly the speed of light have created matter at a temperature of about 4 trillion degrees Celsius -- the hottest temperature ever reached in a laboratory, about 250,000 times hotter than the center of the Sun. This temperature, based upon measurements by the PHENIX collaboration at RHIC, is higher than the temperature needed to melt protons and neutrons into a plasma of quarks and gluons. Details of the findings will be published in Physical Review Letters.

  • Newswire: Brookhaven National Laboratory - 'Bubbles' of Broken Symmetry in Quark Soup at RHIC

    Updated: 2010-02-15 15:00:00
    Data suggest symmetry may melt along with protons and neutrons UPTON, NY -- Scientists at the Relativistic Heavy Ion Collider (RHIC), a 2.4-mile-circumference particle accelerator at the U.S. Department of Energy's Brookhaven National Laboratory, report the first hints of profound symmetry transformations in the hot soup of quarks, antiquarks, and gluons produced in RHIC's most energetic collisions. In particular, the new results, reported in the journal Physical Review Letters, suggest that "bubbles" formed within this hot soup may internally disobey the so-called "mirror symmetry" that normally characterizes the interactions of quarks and gluons.

  • Newswire: Brookhaven National Laboratory - New Findings on Hot Quark Soup Produced at RHIC: Scientists to present latest findings from heavy ion collisions at APS meeting Feb. 15

    Updated: 2010-02-09 06:00:00
    EVENT: Scientists from the U.S. Department of Energy's Brookhaven National Laboratory and the Relativistic Heavy Ion Collider (RHIC), the world's largest particle accelerator dedicated to nuclear physics research, will present compelling new findings about the nature of the "perfect" liquid created in near-light-speed collisions of gold ions at RHIC.

  • Newswire: Oak Ridge National Laboratory - New neutron studies support magnetism's role in superconductors

    Updated: 2010-02-02 06:00:00
    OAK RIDGE, Tenn., Feb. 2, 2010 -- Neutron scattering experiments performed at the Department of Energy's Oak Ridge National Laboratory give strong evidence that, if superconductivity is related to a material's magnetic properties, the same mechanisms are behind both copper-based high-temperature superconductors and the newly discovered iron-based superconductors.

  • Newswire: Announcement of the first ACFA/IPAC Accelerator Prizes

    Updated: 2010-02-01 06:00:00
    With the introduction of a 3-year cycle among the Asian, European and North American Particle Accelerator Conferences, the Asian Committee for Future Accelerators, ACFA, has decided to award prizes in conjunction with the new series of International Particle Accelerator Conferences when they take place in Asia.

  • The Fascinating Search For Rare W Decays

    Updated: 2010-01-30 11:03:26
    W bosons are amazingly interesting objects. Almost thirty years after their discovery -by Carlo Rubbia and his collaborators of the UA1 experiment at CERN- they continue to provide critical information on the theory of electroweak interactions. The front of particle physics has moved quite a bit further from 1983, and yet the weapons we use todat to try and conquer unexplored land have not changed much. Today I wish to summarize one particular search that has been done by the CDF experiment at the Tevatron proton-antiproton collider, one which tries to catch W bosons as they decay in a very uncommon way. read more

  • A possible detection of heavy-photons

    Updated: 2010-01-30 03:52:00
    : skip to main skip to sidebar Axitronics Dark energy solved By giving neutrino there own type of electric and magnetic forces . The force is known as the axial force , thus the title , axitronics , as the equivalent of electronics for . neutrinos Friday , 29 January 2010 A possible detection of heavy-photons Always on the lookout for strange physics , I was fascinated by a Paper by Boer and Fields at ArXiv . They analysised 7 previous experiment all which should something bizarre , A new Light Neutral Boson . There particle has a mass range of 1.5MeV to 20MeV , a lifespan of about 10^-15 to 10^-16 seconds . And strangely shows up only in experiment using photograph Emulsion . There X boson appears to be made in the decay on the neutral pion , one decay out of every thousand , and itself decays into an electron positron pair . They don't even have bad statistics ranging for 2.8 sigma to 8 sigma in the different experiments the . review A boson is a force carrying particle , given a mass of 1 MeV , Boer's and Field's particle would mediate a short range force novel to the standard model . Looking at previous limits to a fifth force this particle is in a range previously thought to

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