HW 6 problems/solutions

HW 6 problems/solutions - file/C|/Documents and...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
phy557_hw06 PHY557 Homework Set 6 Reading: Lecture Notes Homework: Due date: Wednesday Oct 19 Hints and Solutions Problem VI.1 Show that Maxwell's equations are invariant under time reversal. Hints: no hints Solution: Similar to Sect.3.4.1. of the notes Problem VI.2 Assume that you are in contact with a physicist on another galaxy. The contact is restricted to exchange of information. Can you find out if the other physicist is built from matter or antimatter? Discuss the following three possibilities: 1. C , P , and T are conserved in all interactions. 2. In the weak interaction C and P are violated but the combination CP is conserved. 3. C , P , and CP are violated in the weak interaction as discussed in the lecture notes. Hints: no hints Solution: 1. no distinction is possible; you'll have to wait to shake hands and see what happens. .. 2. if CP is conserved: as in 1. 3. if CP is not conserved: then particles and antiparticles can be distinguished by their (slightly) different decay rates.
Background image of page 1

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

View Full Document Right Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: .. file:///C|/Documents%20and%20Settings/Michael/My%20. ..ourses/PHY557/PHY557_F05/PHY557_HW06_solutions.html (1 of 2)11/3/2005 7:16:12 AM phy557_hw06 Problem VI.3 The decay of the η-meson is useful for testing C-invariance. Which of the following decays are allowed and which are forbidden by C-invariance? Give arguments! 1. η→γγ 2. η→π γ 3. η→π π π 4. η→γγγ 5. η→π + π-π Hints: no hints Solution: 1. allowed. C ( η )=+1; C ( γγ )=(-1) 2 =+1 (experiment: 39%) 2. not allowed. C ( η )=+1; C ( π γ ) = ( + 1)(-1)= -1 3. allowed. C ( η )=+1; C ( π π π ) = ( + 1) 3 = + 1 (experiment: 33%) 4. not allowed. C ( η )=+1; C ( γγγ ) = (-1) 3 = -1 (experiment: <10-4 ) 5. allowed. C ( η )=+1; C ( π + π-π )=( π-π + π ) (experiment: 28%) file:///C|/Documents%20and%20Settings/Michael/My%20. ..ourses/PHY557/PHY557_F05/PHY557_HW06_solutions.html (2 of 2)11/3/2005 7:16:12 AM...
View Full Document

{[ snackBarMessage ]}

Page1 / 2

HW 6 problems/solutions - file/C|/Documents and...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online