Grothendieck group: Difference between revisions

Revision as of 04:23, 15 April 2013

Template:Coord KEKB is the name of a particle accelerator used in the Belle experiment to study CP violation. It is called a B-factory for its copious production of B-mesons which provide a golden mode to study and measure the CP violation due to its property of decaying into other lighter mesons. KEKB is basically an asymmetric electron–positron collider, with electrons having the energy of 8 GeV and positrons having the energy of 3.5 GeV, giving 10.58 GeV centre-of-mass energy, which is equal to the mass of the Upsilon(4S) meson.

There are basically two rings for accelerating electrons and positrons. The ring for electrons, having energy of 8 GeV, is called the high-energy ring (HER), while the ring for positrons, having energy of 3.5 GeV, is called low-energy ring (LER). The HER and LER are constructed side-by-side in the tunnel, which has been excavated already in the past for the former TRISTAN accelerator. (TRISTAN was the first site to confirm vacuum polarization around an electron.)^[1] The circumference of each ring is 3016 m, having four straight sections. In the KEKB, there is only one interaction point in the "Tsukuba area", where the Belle experiment is located. The other areas (called "Fuji", "Nikko" and "Oho") are currently not actively used by an experiment.

The KEKB accelerator is located at the High Energy Accelerator Research Organisation (KEK) in Tsukuba, Ibaraki Prefecture, Japan.

Since the energy of the electrons and positrons is asymmetric, the B meson pairs are created with a Lorentz boost $\beta \gamma$ of 0.425, allowing measurements of the B meson decay times via the distance from the (known) collision point.

KEKB's leading finite crossing angle interaction design provides its high luminosity. In the last upgrade, KEKB installed crab cavities on each of its accelerating beams to rotate the bunches of accelerating electrons or positrons, hoping to further increase its luminosity. However, the improvement is not clear and currently under tuning. KEKB is still the world's highest luminosity machine. Its latest world record (in June 2009) is of more than $2.11\times 10^{34}\mathrm {cm} ^{-2}\mathrm {s} ^{-1}$ .

References

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@@ Line 1: / Line 1: @@
-== 流行りの ヴィトン バッグ ==
+{{Coord|36|9|17|N|140|4|19|E|display=title}}
+'''KEKB''' is the name of a particle accelerator used in the [[Belle experiment]] to study [[CP violation]]. It is called a [[B-factory]] for its copious production of B-mesons which provide a golden mode to study and measure the [[CP violation]] due to its property of decaying into other lighter mesons. KEKB is basically an [[symmetry|asymmetric]] [[electron]]–[[positron]] [[collider]], with [[electron]]s having the energy of 8 [[GeV]] and [[positron]]s having the energy of 3.5 [[GeV]], giving 10.58 GeV centre-of-mass energy, which is equal to the mass of the '''[[Upsilon meson|Upsilon(4S)]]''' meson.
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+There are basically two rings for [[accelerating]] [[electron]]s and [[positron]]s. The ring for electrons, having energy of 8 GeV, is called the high-energy ring (HER), while the ring for positrons, having energy of 3.5 GeV, is called low-energy ring (LER). The HER and LER are constructed side-by-side in the tunnel, which has been excavated already in the past for the former TRISTAN accelerator. (TRISTAN was the first site to confirm [[vacuum polarization]] around an electron.)<ref>{{cite journal
+ | last=Levine | first=I. | coauthors=TOPAZ Collaboration
+ | title=Measurement of the Electromagnetic Coupling at Large Momentum Transfer
+ | journal=Physical Review Letters | year=1997
+ | volume=78
+ | issue=3 | pages=424–427
+ | doi=10.1103/PhysRevLett.78.424 | bibcode=1997PhRvL..78..424L}}</ref> The [[circumference]] of each ring is 3016 m, having four straight sections. In the KEKB, there is only one interaction point in the "Tsukuba area", where the [[Belle experiment]] is located. The other areas (called "Fuji", "Nikko" and "Oho") are currently not actively used by an experiment.
-== ヴィトン 財布 日本 ==
+The '''KEKB''' accelerator is located at the ''High Energy Accelerator Research Organisation ([[KEK]])'' in [[Tsukuba]], [[Ibaraki Prefecture]], [[Japan]].
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+Since the energy of the [[electron]]s and [[positron]]s is asymmetric, the B meson pairs are created with a [[Lorentz boost]] <math>\beta\gamma</math> of 0.425, allowing measurements of the B meson decay times via the distance from the (known) collision point.
+KEKB's leading finite crossing angle interaction design provides its high luminosity. In the last upgrade, KEKB installed [[crab cavity|crab cavities]] on each of its accelerating beams to rotate the bunches of accelerating electrons or positrons, hoping to further increase its luminosity. However, the improvement is not clear and currently under tuning. KEKB is still the world's highest luminosity machine. Its latest world record (in June 2009) is of more than <math>2.11 \times 10^{34} \mathrm{cm}^{-2} \mathrm{s}^{-1}</math>.
+==See also==
+* [[Crab cavity]]
+==References==
+<references />
+[[Category:Particle physics facilities]]
+[[Category:Particle experiments]]

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