PYTHIA 6.4 Physics and Manual

events generated in the various allowed channels, and the inferred cross sections.In the run above, a typical event listing might look like the following.Event listing (summary)I particle/jet KF p_x p_y p_z E m1 !p+! 2212 0.000 0.000 8000.000 8000.000 0.9382 !p+! 2212 0.000 0.000-8000.000 8000.000 0.938======================================================================3 !g! 21 -0.505 -0.229 28.553 28.558 0.0004 !g! 21 0.224 0.041 -788.073 788.073 0.0005 !g! 21 -0.505 -0.229 28.553 28.558 0.0006 !g! 21 0.224 0.041 -788.073 788.073 0.0007 !H0! 25 -0.281 -0.188 -759.520 816.631 300.0278 !W+! 24 120.648 35.239 -397.843 424.829 80.0239 !W-! -24 -120.929 -35.426 -361.677 391.801 82.57910 !e+! -11 12.922 -4.760 -160.940 161.528 0.00111 !nu_e! 12 107.726 39.999 -236.903 263.302 0.00012 !s! 3 -62.423 7.195 -256.713 264.292 0.19913 !cbar! -4 -58.506 -42.621 -104.963 127.509 1.350======================================================================14 (H0) 25 -0.281 -0.188 -759.520 816.631 300.02715 (W+) 24 120.648 35.239 -397.843 424.829 80.02316 (W-) -24 -120.929 -35.426 -361.677 391.801 82.57917 e+ -11 12.922 -4.760 -160.940 161.528 0.00118 nu_e 12 107.726 39.999 -236.903 263.302 0.00019 s A 3 -62.423 7.195 -256.713 264.292 0.19920 cbar V -4 -58.506 -42.621 -104.963 127.509 1.35021 ud_1 A 2103 -0.101 0.176 7971.328 7971.328 0.77122 d V 1 -0.316 0.001 -87.390 87.390 0.01023 u A 2 0.606 0.052 -0.751 0.967 0.00624 uu_1 V 2203 0.092 -0.042-7123.668 7123.668 0.771======================================================================sum: 2.00 0.00 0.00 0.00 15999.98 15999.98The above event listing is abnormally short, in part because some columns of informationwere removed to make it fit into this text, in part because all initial- and final-state QCDradiation, all non-trivial beam jet structure, and all fragmentation was inhibited in thegeneration. Therefore only the skeleton of the process is visible. In lines 1 and 2 onerecognizes the two incoming protons. In lines 3 and 4 are incoming partons before initialstateradiation and in 5 and 6 after — since there is no such radiation they coincide here.Line 7 shows the Higgs produced by gg fusion, 8 and 9 its decay products and 10–13 thesecond-step decay products. Up to this point lines give a summary of the event history,indicated by the exclamation marks that surround particle names (and also reflected inthe K(I,1) code, not shown). From line 14 onwards come the particles actually producedin the final states, first in lines 14–16 particles that subsequently decayed, which havetheir names surrounded by brackets, and finally the particles and partons left in the end,including beam remnants. Here this also includes a number of unfragmented partons,since fragmentation was inhibited. Ordinarily, the listing would have gone on for a fewhundred more lines, with the particles produced in the fragmentation and their decayproducts. The final line gives total charge and momentum, as a convenient check thatnothing unexpected happened. The first column of the listing is just a counter, the secondgives the particle name and information on status and string drawing (the A and V), the40