spts An electron traveling with a total relativistic energy

Last updated: 6/21/2023

spts An electron traveling with a total relativistic energy of 7 GeV collides with a positron that travels in th opposite direction with a total relativistic energy of 4 GeV The electron and positron annihilate an produce the Y 4S resonance Upsilon What is the mass in GeV e and the speed of the Y 48 resonance Hint For this problem it is a very good approximation to treat the electron and positro as massless