From Steve Singer
As stated in your article on “atom smashers”, the International Linear Collider will collide electrons with positrons to achieve a maximum collision energy of (only) 1 teraelectronvolt (26 August, p 36). It is also stated that using point-like leptons such as electrons and positrons offers advantages over higher-energy machines using more massive but multi-component particles such as protons. But why not use heavier leptons such as muons in the ILC and get the best of both worlds?
Perth, Western Australia
