5 | | * Use " x x > <span style="color: #990099;">z</span> > y y y " form to require particle <span style="color: #990099;">z</span> to appear in a s-channel intermediate state. |
6 | | * Use " x x > y y y / <span style="color: #990099;">z</span>" form to exclude particle <span style="color: #990099;">z</span> to appear at all in any diagram. |
| 5 | * Use " x x > [[span( z,style=color: #990099;)]] > y y y " form to require particle [[span( z,style=color: #990099;)]] to appear in a s-channel intermediate state. |
| 6 | * Use " x x > y y y / [[span( z,style=color: #990099;)]]" form to exclude particle [[span( z,style=color: #990099;)]] to appear at all in any diagram. |