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Blobrana


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RE: Strange B Meson
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 BaBar data hint at cracks in the standard model

Recently analysed data from BaBar, a high energy physics experiment in the US, may suggest possible flaws in the Standard Model of particle physics, the reigning description of how the universe works on sub-atomic scales. The data from BaBar, a particle accelerator at the U.S. Department of Energy's (DOE's) SLAC National Accelerator Laboratory, built by ten countries including the UK, show that a particular type of particle decay, happens more often than the Standard Model says it should. The UK, through Queen Mary, University of London, was part of a panel to internally review the result that has been presented at a conference in China.
The data refers to a particle called the B-bar meson that decays into a D meson, an anti-neutrino and a tau lepton (³B to D-star-tau-nu²). This particular decay of a B meson should, theoretically, only happen in one in every 100 cases, but the new results from BaBar show it is happening too often. While the level of certainty of the difference, or excess, (3.4 sigma in statistical language) is not enough to claim a break from the Standard Model, the results are a potential sign of something amiss and are likely to impact existing theories.
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Blobrana


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New physics? Researchers see uptick in rare particle decay

An incredibly rare sub-atomic particle decay might not be quite as rare as previously predicted, say Cornell researchers. This discovery, culled from a vast data set at the Collider Detector at Fermilab (CDF), is a clue for physicists trying to catch glimpses of how the universe began.
The work, which is generating buzz because of its possible implications for the existence of new physics, has been submitted to Physical Review Letters by an international team of scientists, among them Julia Thom-Levy, Cornell assistant professor of physics, and graduate student Walter Hopkins.
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Blobrana


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Strange B Meson Studies at LHCb Provide New Tools for Discovery

Using data from experiments performed in 2010 at the Large Hadron Collider (LHC), the world's largest particle accelerator near Geneva, Switzerland, scientists are studying rare particle decays that could explain why the universe has more matter than antimatter.
Led by Sheldon Stone, a physicist at Syracuse University, a group of scientists recently published their first observations of two different decays of "strange B" mesons.
Strange B mesons and their antimatter partners, known as B-bar, are among a very select group of particle pairs that enable direct study of the properties of matter and antimatter. Scientists are interested in them because the difference between the decay properties of a B meson compared to those of the corresponding B-bar could provide clues about the current composition of the universe, which consists almost entirely of matter and no antimatter.
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Blobrana


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The Strange B meson is a meson composed of a bottom antiquark and a strange quark. Its antiparticle is the B s meson, composed of a bottom quark and a strange antiquark. Strange B mesons are noted for their ability to oscillate between matter and antimatter via a box-diagram with Delta ms = 17.77 ± 0.10 (stat) ± 0.07 (syst) ps^-1 measured by CDF experiment at Fermilab
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