lecture_20_07b

lecture_20_07b - 05/07/09 Physics 13 - Fall 07 - G.R....

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Unformatted text preview: 05/07/09 Physics 13 - Fall 07 - G.R. Goldstein 1 http://www.cpepweb.org/particles.html Particle Data Group LBL 05/07/09 Physics 13 - Fall 07 - G.R. Goldstein 2 Origin of Nuclear or Strong Force? Larger than EM repulsion for Z>1, but doesnt act beyond Short range ~ 10-15 m=1fm Compare to EM or QED exchange fields q 1 q 2 Interaction via exchange of EM radiation or photon n p Yukawa predicted as carrier of strong force 05/07/09 Physics 13 - Fall 07 - G.R. Goldstein 3 Exchanges and forces p + p violates E conservation But D E m p c 2 then D t h 2 m p c 2 or c D t h 2 m p c range of strong force is ~ c D t ~ 10- 15 m ~ h 2 m p c Get m p c 2 ~100 MeV (actually 140 MeV) Exchanged quanta related to strength and range of forces EM WI SI G W ? Graviton Z gluon Quantum Field Theory (QED, EW, QCD, Standard Model ) 05/07/09 Physics 13 - Fall 07 - G.R. Goldstein 4 Particle Physics Atoms electrons , nuclei, emit & absorb photons What is elementary ?...
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This note was uploaded on 03/27/2008 for the course PHY 13 taught by Professor Garyr.goldstein during the Fall '04 term at Tufts.

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lecture_20_07b - 05/07/09 Physics 13 - Fall 07 - G.R....

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