There were proposals (36,37) for constructing an asymmetric energy electron-positron collider at the Upsilon(4S) resonance at several places in the world: SLAC, Cornel University, DESY, PSI, BINP and KEK.
At KEK, a taskforce (5) was formed to make a feasibility study for the construction of an asymmetric energy electron-positron collider and it was decided to be built in the existing TRISTAN tunnel, as is discussed in the following section.
The new collider is being built inside CERN's existing circular tunnel, about 27 kilometers in circumference, which originally housed an electron-positron collider
The LHC is slated to go into CERN's existing tunnel, some 27 kilometers in circumference, which now houses an electron-positron collider
By observing the numerous ways in which a particle known as the Z [degree] can decay into other particles, another huge group of researchers working at the Large Electron-Positron collider
at the European Center for Particle Physics in Geneva, Switzerland, has tentatively set an upper limit of roughly 190 GeV on the top quark's mass.
By observing the many ways in which a particle known as the Z[degree] can decay into other particles, researchers working with the ALEPH detector at the Large Electron-Positron collider
in Geneva, Switzerland, have now obtained the msot stringent limit yet excluding the existence of a fourth generation of elementary particles.
Z[degree] particles were produced, first at the Stanford Linear Collider, then at the Large Electron-Positron collider
at CERN (135: 245; 136: 159).
In that electron-positron collider
, expected to be ready by late 1989, two particle beams constantly circulate in opposite directions within a ring 17 miles in circumference.
CERN is busy building a huge new accelerator project, the Large Electron-Positron collider
(LEP), and is doing it under severe budget constraints.
The next five years represent an ideal time window to accomplish our goals, thanks to the wealth of expected data from deep-inelastic scattering experiments (COMPASS, Jefferson Lab), hadronic colliders (Fermilab, BNL, LHC), and electron-positron colliders
These may include synchrotrons that generate intense X rays for analyzing inanimate and biological materials, including cells and tissues, and much more powerful electron-positron colliders
for probing fundamental questions about the universe.
So, scientists in Japan and California have built electron-positron colliders
, called B factories, for making B mesons and exploring their breakdowns (SN: 5/29/99, p.
245), workers on both sides of the Pacific are this week gingerly firing up the particle beams of their newly assembled electron-positron colliders