PHY106Interactions decays and conservation laws

# PHY106Interactions decays and conservation laws - The...

This preview shows pages 1–8. Sign up to view the full content.

The Standard Model of Particle Physics EM STRONG WEAK

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Interactions and Decays Forces are responsible for: Interactions Decays Decays are really a type of interaction though…
What do I mean by an Interaction? 1 2 1 2 1 2 2 1 BAM 4 3 4 3 4 3 3 4 1 + 2 3 + 4

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
What do I mean by a Decay ? 1 3 + 4 1 1 1 1 BAM 4 3 4 3 4 3 3 4
Conservation Laws Conservation Laws , or alternately, conserved quantities , allow you to place constraints on what types of interactions and decays can or cannot occur. Conservation Laws , or alternately, conserved quantities , allow you to place constraints on what types of interactions and decays can or cannot occur .

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Conserved Quantities By conserved , we simply mean that the value on the left hand side must equal the value on the right hand side. Consider the process where two particles A and B collide, and produce particles C and D: A + B C + D Some of the most important examples are: Total energy is ALWAYS conserved – energy cannot be created nor destroyed, only transformed Total momentum is ALWAYS conserved Total charge is ALWAYS conserved - cannot simply create net charge Some of the most important examples are: Total energy is ALWAYS conserved – energy cannot be created nor destroyed, only transformed Total momentum is ALWAYS conserved Total charge is ALWAYS conserved - cannot simply create net charge
Energy Conservation (I) A + B C + D Energy conservation means: Energy of particle “A” + Energy of particle “B” = Energy of particle “C” + Energy of particle “D” E A + E B = E C + E D Or, in simpler notation, If you knew any 3 of the energies, you could compute the fourth!

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern