| Name | Variable |
| weigth | weights of the events (normally 1) |
| Ht | scalar sum of pt of all particles + missing Et |
| pt(i) | transverse momentum |
| y(i) | rapidity in the lab |
| R(i,j) | distance in the (y,phi) plane |
| m(i,j) | invariant mass |
| cos(i,j) | angle between direction of i in the resframe of i+j and the direction of i+j in the labframe |