The ARGUS experiment was a particle physics

Particle physics

Particle physics is a branch of physics that studies the existence and interactions of particles that are the constituents of what is usually referred to as matter or radiation. In current understanding, particles are excitations of quantum fields and interact following their dynamics...

 experiment that ran at the electron-positron collider ring DORIS II at DESY

DESY

The DESY is the biggest German research center for particle physics, with sites in Hamburg and Zeuthen....

. It is the first experiment that observed the mixing of the B meson

B meson

B mesons are mesons composed of a bottom quark or bottom antiquark and either an up , down , strange or charm quark . The combination of a bottom antiquark and a top quark is not thought to be possible because of the top quark's short lifetime...

s (in 1987).

The ARGUS detector was a hermetic detector

Hermetic detector

In particle physics, a hermetic detector is a particle detector designed to observe all possible decay products of an interaction between subatomic particles in a collider by covering as large an area around the interaction point as possible and incorporating multiple types of sub-detectors...

 with 90% coverage of the full solid angle. It had drift chambers, a time-of-flight system, an electromagnetic calorimeter

Calorimeter (particle physics)

In particle physics, a calorimeter is an experimental apparatus that measures the energy of particles. Most particles enter the calorimeter and initiate a particle shower and the particles' energy is deposited in the calorimeter, collected, and measured. The energy may be measured in its...

and a muon chamber system.

External links

• Webpage of ARGUS Fest, a symposium to commemorate the 20th anniversary of the discovery of B-meson oscillations. (Last accessed on Sept. 10, 2007)