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Encyclopedia > Belle Experiment

The Belle Experiment is a particle physics experiment conducted by the Belle Collaboration, an international collaboration of more than 400 physicists and engineers investigating CP-violation effects at the High Energy Accelerator Research Organisation (KEK) in Tsukuba, Ibaraki Prefecture, Japan. The Belle detector, located at the collision point of the experiment, is a multi-layer particle detector. Its large solid angle coverage, vertex location with precision on the order of tens of micrometres (provided by a silicon vertex detector), good pion-kaon separation at multi-GeV momenta (provided by a novel Cherenkov detector), and few-percent precision electromagnetic calorimetry (CsI(Tl) scintillating crystals) allow for many other scientific searches apart from CP-violation. Extensive studies of rare decays, searches for exotic particles and precision measurements of bottom and charm mesons and tau lepton have been carried out and have resulted in over 200 publications in physics journals. Thousands of particles explode from the collision point of two relativistic (100 GeV per nucleon) gold ions in the STAR detector of the Relativistic Heavy Ion Collider. ... CP-symmetry is a symmetry obtained by a combination of the C-symmetry and the P-symmetry. ... For the DC Comics Superhero also called Atom Smasher, see Albert Rothstein. ... For other uses, see KEK (disambiguation). ... Tsukuba (Japanese: つくば市; -shi; from Han character 筑波) is a planned city located in Ibaraki Prefecture, Japan. ... Ibaraki Prefecture ) is located in the Kantō region on HonshÅ« island, Japan. ... Cherenkov effect at the UMRs nuclear reactor Cherenkov radiation (also spelled Cerenkov) is electromagnetic radiation emitted when a charged particle passes through an insulator at a speed greater than that of light in the medium. ... The tau lepton (often called the tau or occasionally the tauon) is a negatively charged elementary particle with a lifetime of 3×10−13 seconds and a high mass of 1777 MeV (compared to 939 MeV for protons and 0. ...


Highlights of the Belle experiment so far include the 1st observation of CP violation outside of the kaon system (2001), observation of; B to K^* l^+ l^- and b to s l^+ l^-; measurement of φ3 using the B to D K, D to K_S pi^+ pi^- Dalitz plot; measurement of the CKM quark mixing matrix elements | Vub | and | Vcb | ; observation of direct CP violation in B^0 to pi^+ pi^- and B^0 to K^- pi^+; observation of b to d transitions; evidence for B to tau nu and observations of a number of new particles including the X(3872). The X(3872) is an anomalous particle which does not fit into the quark model because of its quantum numbers. ...


The Belle experiment operates at the KEKB accelerator, the world's highest luminosity machine. The instantaneous luminosity exceeds 1.7 times 10^{34}/cm^2/sec. The integrated luminosity is greater than 700~ fb^{-1} (in excess of 600 million B bar B meson pairs). Most data is recorded on the Upsilon(4S) resonance, which decays to pairs of B mesons (particles containing b-quarks). About 10% of the data is recorded below the Upsilon(4S) resonance in order to study backgrounds. In addition, Belle has carried out special short runs at the Upsilon(5S) resonance to study Bs mesons (particles with a b quark and s anti-quark) as well as on the Upsilon(3S) resonance. KEKB is the name of the accelerator used in the Belle experiment to study CP Violation. ...


Plans for a Super B-factory, an upgraded facility with two orders of magnitude more luminosity are now under discussion.


Contact Jeremy Dalseno for any further information.


External links

  • Official Belle Website

  Results from FactBites:
 
Belle experiment - Wikipedia, the free encyclopedia (222 words)
The Belle Experiment is a particle physics experiment conducted by the Belle Collaboration, an international collaboration of more than 400 physicists and engineers investigating CP-violation effects at the High Energy Accelerator Research Organisation (KEK) in Tsukuba, Ibaraki Prefecture, Japan.
The Belle detector, located at the collision point of the experiment, is a multi-layer particle detector.
The Belle experiment operates at the KEKB accelerator, the world's highest luminosity machine.
Belle - Wikipedia, the free encyclopedia (244 words)
Southern Belle (LBSC), a passenger train operated by the London, Brighton and South Coast Railway
Belle, Missouri, a town in the United States
Belle (Peanuts), is character in the Peanuts comic strip
  More results at FactBites »

 
 

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