Science News Encyclopedia LHC Library Video Library Book Club Challenges Children Posters questions Scientific schedule Science and Law ZOB Science in RuNet Subscribe to news science (on Subscribe.ru) Library F. Ashcroft "Spark of Life: Electricity in the human body." Chapter from the book I. Stewart "the spele greatest mathematical problems." Chapter from the book by R. Hazen "History of the Earth." spele Chapter from the book B. Givotovsky programmed cell death - medicine Krylov "The value of mathematics for shipbuilder", "Ship self-taught engineer," "On the wave of water resistance and wake wave" A. Muradova spele Attempted murder linguistic O. Weinstein "Preserving calm, hitting a surprise ": rules of dandyism S. GOLUBKOV chemical affinity Arkhipov Creator spele language (SV Kodzasova memory) N. Resnick alligator with a cane, Tyrannosaurus with bone
The results spele of experiments on the measurement of mixing in B s mesons. Vertical postponed difference decay widths of the light and heavy B s mesons, horizontally - the parameter φ s, proportional to the CP-violation. Colored areas correspond to different experiments within their errors; the smaller the area, the more accurate the result. The final result is shown in green LHCb. Black stripe - predictions of the Standard Model. Image from lhcb-public.web.cern.ch In anticipation of the new session of the Large Hadron Collider (Run 2), the experimental group gradually completes processing the data accumulated so far in the session spele Run 1. Many of the results of measurement of various sizes can be called final - they are final with respect to Run 1, and further progress will be linked already spele with future data.
CERN recently went to a small conference Implications of LHCb measurements and future prospects, entirely devoted to the results of the collaboration LHCb. Among other things, there were presented the final data on the measurement of CP-violation in the B s mesons (hadrons with quark composition s-anti-b).
In general, the study of oscillations and CP-violation in heavy mesons - one of the main objectives of this detector. Neutral mesons spele have the curious property that due to the weak interaction have particle and antiparticle spontaneously spele mixed with each other. As a result of mixing two mesons are obtained with an uncertain quark composition and with different masses and lifetimes. A more subtle effect - this CP-violation, because of which the meson decay to some set of particles does not coincide with the same decay, spele in which all particles are changed into antiparticles.
All of these effects are very important not only for the world of elementary particles, but also to find out why our universe spele is dominated by matter over antimatter. CP-violation in heavy mesons is convenient because the Standard Model predicts a fairly small value for the mixing parameter φ s. In the background you can try to note the possible effects of new physics, which just reinforced for heavy mesons. spele In addition, several years ago, when the Tevatron for the first time to measure this value, it was abnormally large, much more predictions of the Standard Model. Error, spele however, were great, and so the main hopes were pinned on the Large Hadron Collider, and specifically, to experiment LHCb.
The first measurements at LHCb showed that the value φ s is not as great as claimed by the Tevatron. With the accumulation of measurement data specified. A few months ago published the results of measurements in the decay φ s on a combination of mesons J / ψ π + π -. A month ago for the same purpose has been studied the decay of B s mesons on a couple of D s + D s -. Finally, today unveiled a new collaboration measurement results spele φ s, this time in the decay into J / ψ K + K -, and summed up under all these measurements.
This final result with less accurate data from other experiments shown in Fig. The conclusion is simple: the phenomenon of mixing and CP-violation in the B s mesons is also quite consistent with the Standard Model - at least, according to Run 1. Will this trend continue in the future data Run 2, we learn only after a couple spele of years.
Latest news: LHC on November 29 began to spread CERN LHC data publicly available spele on November 29 Started new educational projects related to physics at the LHC proton beam on November 29 at the door LHC November 8 issued new parton distributions for the LHC on November 2 to specify spele the plan of work for the next collider time October 12 Sheaf being used to test the new detector technologies October 12 ATLAS presented spele new results on the decay of a Higgs boson 29 September Ends modernization of all the detectors at the LHC August 23 exotic Search
The results spele of experiments on the measurement of mixing in B s mesons. Vertical postponed difference decay widths of the light and heavy B s mesons, horizontally - the parameter φ s, proportional to the CP-violation. Colored areas correspond to different experiments within their errors; the smaller the area, the more accurate the result. The final result is shown in green LHCb. Black stripe - predictions of the Standard Model. Image from lhcb-public.web.cern.ch In anticipation of the new session of the Large Hadron Collider (Run 2), the experimental group gradually completes processing the data accumulated so far in the session spele Run 1. Many of the results of measurement of various sizes can be called final - they are final with respect to Run 1, and further progress will be linked already spele with future data.
CERN recently went to a small conference Implications of LHCb measurements and future prospects, entirely devoted to the results of the collaboration LHCb. Among other things, there were presented the final data on the measurement of CP-violation in the B s mesons (hadrons with quark composition s-anti-b).
In general, the study of oscillations and CP-violation in heavy mesons - one of the main objectives of this detector. Neutral mesons spele have the curious property that due to the weak interaction have particle and antiparticle spontaneously spele mixed with each other. As a result of mixing two mesons are obtained with an uncertain quark composition and with different masses and lifetimes. A more subtle effect - this CP-violation, because of which the meson decay to some set of particles does not coincide with the same decay, spele in which all particles are changed into antiparticles.
All of these effects are very important not only for the world of elementary particles, but also to find out why our universe spele is dominated by matter over antimatter. CP-violation in heavy mesons is convenient because the Standard Model predicts a fairly small value for the mixing parameter φ s. In the background you can try to note the possible effects of new physics, which just reinforced for heavy mesons. spele In addition, several years ago, when the Tevatron for the first time to measure this value, it was abnormally large, much more predictions of the Standard Model. Error, spele however, were great, and so the main hopes were pinned on the Large Hadron Collider, and specifically, to experiment LHCb.
The first measurements at LHCb showed that the value φ s is not as great as claimed by the Tevatron. With the accumulation of measurement data specified. A few months ago published the results of measurements in the decay φ s on a combination of mesons J / ψ π + π -. A month ago for the same purpose has been studied the decay of B s mesons on a couple of D s + D s -. Finally, today unveiled a new collaboration measurement results spele φ s, this time in the decay into J / ψ K + K -, and summed up under all these measurements.
This final result with less accurate data from other experiments shown in Fig. The conclusion is simple: the phenomenon of mixing and CP-violation in the B s mesons is also quite consistent with the Standard Model - at least, according to Run 1. Will this trend continue in the future data Run 2, we learn only after a couple spele of years.
Latest news: LHC on November 29 began to spread CERN LHC data publicly available spele on November 29 Started new educational projects related to physics at the LHC proton beam on November 29 at the door LHC November 8 issued new parton distributions for the LHC on November 2 to specify spele the plan of work for the next collider time October 12 Sheaf being used to test the new detector technologies October 12 ATLAS presented spele new results on the decay of a Higgs boson 29 September Ends modernization of all the detectors at the LHC August 23 exotic Search
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