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LHC Restarts High-Energy Quest For Exotic Physics 85

astroengine writes: It's official: After a long 27 month hiatus for upgrades and a 2 month restart, the world's largest particle accelerator is back in the particle collision business. As of 10:40 a.m. CET (5:40 a.m. ET), the Large Hadron Collider (LHC) was running at record-breaking energies and collecting science data. Physicists now expect the particle collider to run non-stop for the next 3 years. We are in a new era of high-energy particle physics where, for the first time, we don't exactly know what we'll find. "With the LHC back in the collision-production mode, we celebrate the end of two months of beam commissioning," said CERN Director of Accelerators and Technology Frédérick Bordry in a press release. "It is a great accomplishment and a rewarding moment for all of the teams involved in the work performed during the long shutdown of the LHC, in the powering tests and in the beam commissioning process. All these people have dedicated so much of their time to making this happen."

Prospects and Limits For the LHC's Capabilities To Test String Theory 148

StartsWithABang writes: The Large Hadron Collider has just been upgraded, and is now making the highest energy collisions of any human-made machine ever. But even at 13 TeV, what are the prospects for testing String Theory, considering that the string energy scale should be up at around 10^19 GeV or so? Surprisingly, there are a number of phenomenological consequences that should emerge, and looking at what we've seen so far, they may disfavor String Theory after all.

Scientists To Hunt For Supersymmetric Particle In LHC 89

An anonymous reader notes this article about the upcoming restart of the LHC. "A senior researcher at the Large Hadron Collider says a new particle could be detected this year that is even more exciting than the Higgs boson. The accelerator is due to come back online in March after an upgrade that has given it a big boost in energy. This could force the first so-called supersymmetric particle to appear in the machine, with the most likely candidate being the gluino. Its detection would give scientists direct pointers to "dark matter". And that would be a big opening into some of the remaining mysteries of the universe. 'It could be as early as this year. Summer may be a bit hard but late summer maybe, if we're really lucky,' said Prof Beate Heinemann, who is a spokeswoman for the Atlas experiment, one of the big particle detectors at the LHC. 'We hope that we're just now at this threshold that we're finding another world, like antimatter for instance. We found antimatter in the beginning of the last century. Maybe we'll find now supersymmetric matter.'"

Fresh Evidence Supports Higgs Boson Discovery 42

An anonymous reader writes Researchers at CERN have discovered the first evidence for the direct decay of the Higgs boson into fermions, a strong indication that the particle found two years ago is the Higgs boson. From the article: "Assistant professor of physics at MIT and leader of the international effort, Markus Klute, said that his team was trying to establish if the particle that was discovered in 2012 was really consistent with the Higgs boson that was found in the Standard Model, and not one of many Higgs bosons, or an a particle that looks like it but has a different origin." Their researchers also found that the bosons also decay to fermions (fermions include all quarks and leptons) in a way that is consistent with the Standard Model Higgs. 'We have now established the main characteristics of this new particle, in its coupling to fermions and to bosons, and its spin-parity structure; all of these things are consistent with the Standard Model,' Klute says." CERN has also announced the LHC restart schedule.
Data Storage

How the LHC Is Reviving Magnetic Tape 267

sandbagger writes "The Large Hadron Collider is the world's biggest science experiment. When spinning, it reportedly generates up to six gigs of data per second. Today's six-terabyte tape cartridges fill rapidly when you're creating that amount of material. The Economist reports that despite the advances in SSDs and hard drives, tape still seems to be the way to go when you need to store massive amounts of digital assets."

CERN's LHC Powers Down For Two Years 71

An anonymous reader writes "Excitement and the media surrounded the Higgs boson particle for weeks when it was discovered in part by the Large Hadron Collider (LHC). But now, the collider that makes its home with CERN, the famed international organizational that operates the world's largest particle physics laboratory, is powering down. The Higgs boson particle was first discovered by the LHC in 2012. The particle, essentially, interacts with everything that has mass as the objects interact with the all-powerful Higgs field, a concept which, in theory, occupies the entire universe." We covered the repair announcement last month.

CERN's LHC To Shut Down For Repair & Upgrades 97

hypnosec writes "CERN has revealed that the Large Hadron Collider (LHC) is going into hibernation and will be shut down for a period of two years for upgrades. The LHC will go through a maintenance and upgrade phase starting in March that will bring the atom smasher up to speed with its maximum energy levels. From the article: 'The machine that last year helped scientists snare the elusive Higgs boson – or a convincing subatomic impostor – faces a two-year shutdown while engineers perform repairs that are needed for the collider to ramp up to its maximum energy in 2015 and beyond. The work will beef up electrical connections in the machine that were identified as weak spots after an incident four years ago that knocked the collider out for more than a year.'"

Supersymmetry Theory Dealt a Blow 143

Dupple writes in with some news from the team at the Large Hadron Collider. "Researchers at the Large Hadron Collider have detected one of the rarest particle decays seen in Nature. The finding deals a significant blow to the theory of physics known as supersymmetry. Many researchers had hoped the LHC would have confirmed this by now. Supersymmetry, or SUSY, has gained popularity as a way to explain some of the inconsistencies in the traditional theory of subatomic physics known as the Standard Model. The new observation, reported at the Hadron Collider Physics conference in Kyoto, is not consistent with many of the most likely models of SUSY. Prof Chris Parke, who is the spokesperson for the UK Participation in the LHCb experiment, told BBC News: 'Supersymmetry may not be dead but these latest results have certainly put it into hospital.'"

CERN's Higgs Boson Discovery Passes Peer Review Publication Hurdle 73

MrSeb writes "CERN's announcement on July 4 — that experiments performed by the Large Hadron Collider had discovered a particle that was consistent with the Higgs boson — has passed a key step towards becoming ratified science: Its findings have been published in the peer-reviewed journal Physics Letters B, effectively becoming science in the process. Before we actually know what the new particle is, CERN, the LHC, and the CMS and ATLAS teams must perform additional tests. The LHC had been scheduled to shut down for upgrades, but following the July announcement it has instead been smashing protons together nonstop, to produce more data for CMS and ATLAS to analyze. By December, it is hoped that both teams will have a much better idea of the properties of the new particle, and whether it is actually the Higgs boson."

Fermi Lab's New Particle Discovery in Question 62

"Back in April physicists at Fermilab speculated that they may have discovered a new force or particle. But now another team has analyzed data from the collider and come to the exact opposite conclusion. From the article: 'But now, a rival team performing an independent analysis of Tevatron data has turned up no sign of the bump. It is using the same amount of data as CDF reported in April, but this data was collected at a different detector at the collider called DZero. "Nope, nothing here – sorry," says Dmitri Denisov, a spokesman for DZero.'"

Rumors of Higgs Boson Discovery At LHC 225

Magnifico writes "LiveScience is reporting that scientists are abuzz over a controversial rumor that the 'God particle' has been detected by a particle-detection experiment at LHC at CERN. The Higgs boson rumor is based on what appears to be a leaked internal note from physicists at the Large Hadron Collider (LHC), a 17-mile-long particle accelerator near Geneva, Switzerland. It's not entirely clear at this point if the memo is authentic... The buzz started when an anonymous commenter recently posted an abstract of the note on Columbia University mathematician Peter Woit's blog, Not Even Wrong. This could be a flat-out hoax or a statistical anomaly or... confirmation of the particle that bestows mass on all the other particles."

LHC Scientists Create and Capture Antimatter 269

Velcroman1 writes "Scientists at the Large Hadron Collider have created antimatter in the form of antihydrogen, demonstrating how it's possible to capture and release it. The development could help researchers devise laboratory experiments to learn more about this strange substance, which mostly disappeared from the universe shortly after the Big Bang 14 billion years ago. Trapping any form of antimatter is difficult, because as soon as it meets normal matter — the stuff Earth and everything on it is made out of — the two annihilate each other in powerful explosions. 'We are getting close to the point at which we can do some classes of experiments on the properties of antihydrogen,' said Joel Fajans, a University of California, Berkeley professor of physics, and LBNL faculty scientist. 'Since no one has been able to make these types of measurements on antimatter atoms at all, it's a good start.'"

Europe's LHC To Run At Half-Energy Through 2011 194

quaith writes "ScienceInsider reports that Europe's Large Hadron Collider will run at half its maximum energy through 2011 and likely not at all in 2012. The previous plan was to ramp it up to 70% of maximum energy this year. Under the new plan, the LHC will run at 7 trillion electron-volts through 2011. The LHC would then shut down for a year so workers could replace all of its 10,000 interconnects with redesigned ones allowing the LHC to run at its full 14 TeV capacity in 2013. The change raises hopes at the LHC's lower-energy rival, the Tevatron Collider at Fermi National Accelerator Laboratory in Batavia, Illinois, of being extended through 2012 instead of being shut down next year. Fermilab researchers are hoping that their machine might collect enough data to beat the LHC to the discovery of the Higgs boson, a particle key to how physicists explain the origin of mass."

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