Tutorial Answers - School of Physics - The University of New South ...
Tutorial Answers - School of Physics - The University of New South ...
Tutorial Answers - School of Physics - The University of New South ...
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28. [K 18.8]. Analyse the following reactions according to their quark content:<br />
( a)<br />
( b)<br />
K<br />
−<br />
+ p → Ω<br />
−<br />
+ K<br />
+<br />
+<br />
+ K<br />
0<br />
0<br />
0<br />
( c)<br />
+ p → Ξ<br />
+ K<br />
p + p → p + π + Λ + K<br />
( d)<br />
π + n → ∆ + π<br />
K<br />
−<br />
−<br />
−<br />
−<br />
+<br />
0<br />
( a)<br />
us + uud → sss + us + ds ∴ uu → ss + ss<br />
( b)<br />
uud + uud → uud + ud + uds + ds ∴ create dd<br />
−<br />
− +<br />
( c)<br />
K + p → Ξ + K<br />
us + uud → dss + us ∴ uu → ss<br />
( d)<br />
K<br />
−<br />
+ p → Ω<br />
+ K<br />
+<br />
p + p → p + π + Λ<br />
−<br />
−<br />
π + n → ∆<br />
−<br />
0<br />
+ π<br />
+ K<br />
+ K<br />
ud + udd → ddd + ( uu + dd ) ∴ create dd<br />
+<br />
0<br />
0<br />
0<br />
+ ss<br />
29. [K 17.4]. Find which <strong>of</strong> the following reactions are forbidden by one or more<br />
conservation laws. Give all violated laws in each case.<br />
+<br />
( a)<br />
K + n → Σ + π<br />
( b)<br />
−<br />
+ 0<br />
π + n → K + Λ<br />
( c)<br />
−<br />
0<br />
K + p → n + Λ<br />
+<br />
0<br />
( d)<br />
( e)<br />
π<br />
−<br />
π<br />
+ p → Σ<br />
+ p → Ξ<br />
( f ) d + d →α<br />
+ π<br />
−<br />
+<br />
+ K<br />
−<br />
0<br />
−<br />
+ K<br />
+<br />
+ K<br />
0<br />
(a) S; (b) Q & T 3 ; (c) T & T 3 ; (d) S & T 3 ; (e) S & T 3 and (f) T
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