Exercises Using Bubble Chamber Photographs http://teachers.web.cern.ch/teachers/archiv/HST2005/bubble_chambers/BCwebsite/index.htm

1. What is the direction of the magnetic field if the incoming beam is of K- particles?

2. How many charged particles leave point A ?

3. Is the event at point A, a decay or a collision ?

B It is a neutral particle 4. What can we say about the particle that produces the event at point B; what is it’s charge? B It is a neutral particle

p + p - 5. The particles leaving the decay point B are pions p . What are their charges? B

E D C A From the kink at point C 6. Connect point D with E Does the neutral particle that decays at point D come from point C or A ? A C D E From the kink at point C For justification of method, click here: http://teachers.web.cern.ch/teachers/archiv/HST2005/bubble_chambers/BCwebsite/articles/V0_decays.pdf

E D The positive particle 7. Which of the particles that travel between points D and E has the larger momentum? D E The positive particle

C A W - 8. What particle travels between points A and C? W -, K -, S + or X - ? A C W - http://teachers.web.cern.ch/teachers/archiv/HST2005/bubble_chambers/BCwebsite/index.htm