PHY106The Weak Force

PHY106The Weak Force - The Weak Force EM STRONG WEAK ? The...

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Unformatted text preview: The Weak Force EM STRONG WEAK ? The Force Carriers Like the Electromagnetic & Strong forces, the Weak force is also mediated by force carriers. For the weak force, there are actually 3 force carriers: W + W- Z These weak force carriers carry electric charge also ! This weak force carrier is electrically neutral The charge of the weak interaction is called weak charge Weak Charge of Quarks & Leptons Both quarks & leptons carry weak charge Both quarks & leptons couple to the W and Z force carriers Since the Ws have a charge of +1 and 1 they cause a charge- changing interaction. That is when they are emitted or absorbed, to conserve charge, the emitting or absorbing particle changes charge by +1 or 1 unit. The emitting or absorbing particle changes into a different particle. Alternately, when the W decays, it decays into 2 particles which: (a) Carry weak charge (b) The sum of their charges equals the charge of the W Comparison of the Force Carriers Property EM Strong Weak Force Carrier Photon ( ) Gluon (g) W + , W- Z Charge of force carrier None Color Electrical & Weak Weak Couples to: Quarks & Charged leptons Quarks only All quarks & all leptons All quarks & all leptons Range Infinite (1/d 2 ) <10-14 [m] (inside hadrons) < 2x10-18 [m] < 2x10-18 [m] Notice that the weak force only operates at distances ~ < 10-18 [m] ! Particles & Forces quarks Charged leptons (e, , ) Neutral leptons ( ) Strong Electro- Magnetic Weak Y Y Y Y Y Y N N N Quarks carry strong, weak & EM charge !!!!! Neutrinos From the previous table, you saw that neutrinos only interact via the weak force ....
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PHY106The Weak Force - The Weak Force EM STRONG WEAK ? The...

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