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Mars Base

Tevatron experiments report latest results in search for Higgs boson - 0 views

www.physorg.com/...atest-results-higgs-boson.html

scibyte37 HiggsBoson

shared by Mars Base on 07 Mar 12 - No Cached
  • New measurements
  • indicate that the elusive Higgs boson may nearly be cornered.
  • two independent experiments see hints of a Higgs boson.
  • ...24 more annotations...
  • collaborations found excesses in their data that might be interpreted as coming from a Higgs boson with a mass in the region of 115 to 135 GeV.
  • claim evidence of a new particle only if the probability that the data could be due to a statistical fluctuation is less than 1 in 740
  • claimed only if that probability is less than 1 in 3.5 million, or five sigmas.
  • stringent constraints established by earlier direct and indirect measurements made by CERN’s Large Hadron Collider, the Tevatron, and other accelerators,
  • place the mass of the Higgs boson within the range of 115 to 127 GeV
  • consistent with the December 2011 announcement of excesses seen in that range by LHC experiments, which searched for the Higgs in different decay patterns
  • None of the
  • experiments
  • are strong enough to claim evidence for the Higgs boson
  • This is an important milestone for the Tevatron experiments, and demonstrates the continuing importance of independent measurements
  • the latest result in a decade-long search by teams of physicists at the Tevatron
  • two collaborations independently combed through hundreds of trillions of proton-antiproton collisions recorded by their experiments to arrive at this exciting result
  • Higgs bosons, if they exist, are short-lived and can decay in many different ways.
  • Higgs can decay into different combinations of particles
  • still much work ahead before the scientific community can say for sure whether the Higgs boson exists
  • According to the Standard Model, the theory that explains and predicts how nature’s building blocks behave and interact with each other, the Higgs boson gives mass to other particles
  • Physicists have known for a long time that the Higgs or something like it must exist
  • Higgs boson is created in a high-energy particle collision, it immediately decays into lighter more stable particles
  • physicists retraced the path of these secondary particles and ruled out processes that mimic its signal.
  • Tevatron was a proton/anti-proton collider, with a maximum center of mass energy of 2 TeV,
  • LHC is a proton/proton collider that will ultimately reach 14 TeV
  • two accelerators collide different pairs of particles at different energies and produce different types of backgrounds
  • search strategies are different
  • search for the Higgs boson by the Tevatron and LHC experiments is like two people taking a picture of a park from different vantage points
Mars Base

A Close-up Look at the Massive Solar Storm that Shook the Sun - 0 views

www.universetoday.com/...solar-storm-that-shook-the-sun

scibyte37 sun

shared by Mars Base on 08 Mar 12 - No Cached
  • large X5.4 solar flare that erupted on the Sun on March 7, 2012 at 00:28 UT, (7:28 PM EST on March 6).
  • high-definition views from the Solar Dynamics Observatory also show the subsequent solar tsunami that rippled across the Sun, appearing as though the Sun ‘shook’ from the force of the flare.
  • NASA Goddard’s Space Weather Lab and NOAA Space Weather Prediction Center say surely there will be aurorae from this blast
  • ...10 more annotations...
  • After the first big blast, about an hour later, at 01:14 UT (8:14 PM EST, March 6) the same region let loose an X1.3 class flare. An X1 is 5 times smaller than an X5 flare
  • the region had already produced numerous M-class and one X-class flare,
  • region continues to rotate across the front of the sun, so these latest flares were more Earth-facing than the previous ones
  • big blast did trigger a temporary radio blackout on the sunlit side of Earth that interfered with radio navigation and short wave radio.
  • that solar tsunami
  • waves move at over a million miles per hour
  • one side of the Sun to the other in about an hour
  • movie shows two distinct waves. The first seems to spread in all directions; the second is narrower, moving toward the southeast
  • waves are associated with, and perhaps trigger, fast coronal mass ejections, so it is likely that each one is connected to one of the two CMEs that were associated with the flares
  • Close-up Look at the Massive Solar Storm
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