1293_Physics ProblemsTechnical Physics

1293_Physics ProblemsTechnical Physics - 634 Particle...

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634 Particle Physics and Cosmology P46.32 (a) K 0 d s total strangeness 1 0 1 1 baryon number 0 1/3 –1/3 0 charge 0 e /3 e /3 0 (b) Λ 0 u d s total strangeness –1 0 0 –1 –1 baryon number 1 1/3 1/3 1/3 1 charge 0 2 e /3 e /3 e /3 0 P46.33 (a) π +→ + pK 00 Λ In terms of constituent quarks: ud uud ds uds +→ + up quarks: −+ → + 12 01 ,o r 11 down quarks: 11 11 +→+ r 22 strange quarks: 0 0 1 1 −+ r 0 0 (b) ++ + Σ du uud us uus + up quarks: 12 12 r 33 down quarks: −+→ + 11 00 , o r 0 0 strange quarks: 0 0 1 1 r 0 0 ( c ) KpKK +→ + + 0 us uud us ds sss + + up quarks: −+ → + + 12 100 , o r 1 1 down quarks: 01 010 +→++ r strange quarks: 10 113 −−+ r 11 (d) pp K p 0 +→ ++ + + ? uud uud ds uud ud + ? The quark combination of ? must be such as to balance the last equation for up, down, and strange quarks. up quarks: 2 2 0 2 1 +=+++ ? (has 1 u quark) down quarks: 1 1 1 1 1 +=+−+ ? (has 1 d quark) strange quarks: 0 0 1 0 0 += −+++ ? (has 1 s quark) quark composition == uds or 0 ΛΣ 0 P46.34 In the first reaction, 0 Λ
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