What Questions Remain in Particle Physics?. Why are there three types of quarks and leptons of each charge? Why do the particles haves the masses they do? Are there more types of particles and forces to be discovered at yet higher-energy accelerators?
Energies are often expressed in units of "electron-volts". An electron-volt (eV) is the energy acquired by a electron (or any particle with the same charge) when it is accelerated by a potential difference of 1 volt.
Click on a particle type to visualise that particle in CMS
Press “escape” to exit
This is just one small piece of the CMS detector, called the barrel yoke:
View along beam line of the inner tracking, with a H 4m event superimposed. The m are very high energy, so leave straight tracks originating from the centre and travelling to the outside
Make a “cut” on the
Of the tracks: pT>2 GeV