import feynman; // set default line width to 0.8bp currentpen = linewidth(0.8); // scale all other defaults of the feynman module appropriately fmdefaults(); // disable middle arrows currentarrow = None; // define vertex and external points pair xu = (-40,+45); pair xl = (-40,-45); pair yu = (+40,+45); pair yl = (+40,-45); pair zu = ( 0,+ 5); pair zl = ( 0,- 5); // define mid points pair mxu = (xu+zu)/2; pair mxl = (xl+zl)/2; pair myu = (yu+zu)/2; pair myl = (yl+zl)/2; // draw fermion lines drawFermion(xu--zu--yu); drawFermion(xl--zl--yl); // draw vertices drawVertexOX(zu); drawVertexOX(zl); // draw gluon. Note that the underlying fermion line is blotted out. drawGluon(arc((0,0),mxu,myl,CW)); // shipout
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