Diana and Selected Applications *

New developments concerning the extension of the Feynman diagram analyzer DIANA are presented. We discuss new graphics facilities, different approaches to automation of momenta distribution and parallel processing facilities. Furthermore applications to t ¯ t production and Bhabha scattering are shortly discussed. The project called DIANA (DIagram ANA-lyzer)[1] for the evaluation of Feynman diagrams was started by our group some time ago. It was already used to calculate several processes [2]. The recent development 1 of this project is documented in this contribution. The pictorial representation of diagrams described in [3] includes three different kinds of postscript files. Now one more kind is available, the encapsulated postscript file containing particle lines together with momenta flow [4] 2 : e + γ e + γ e + e + e + +k1+e1 +k2+e2 +k2 +k1 +k1-k2 +e1 +e2 To use it, the user invokes the function \outInfoEPS(Fname,Height,Font,Fontsize). The picture will be saved in the file Fname. If Fontsize = 0 the particle images (e.g. e ±) will not be printed. The width of the diagram will be calculated from " Height ". The diagram will be scaled to fit the EPS bounding box [0 0 Width Height]. Some parameters may be adjusted by the user. There are two functions, \setIEPSshift() and \setIEPSpars(), which may be invoked in the " initialization " section to reset default parame-Particle identifiers can now be depicted by different fonts, sizes and colours. By default the particle image will be printed as in the corresponding entry of the propagator specified in the 'model file'. The user can set other images by means of the model extension, added in version 2.28, or by using the function \setparticleimage(A,image). The particle images are produced by specific constructions, e.g.: W{y(10)+} → W +. 'Blocks' allow local shifting etc. of certain characters. A block is started by '{' followed by a keyword with parameters in parenthesis: {x(#) ... }-paints the content shifted along the abscissa (x). After the block, the current point is set to (old x, new y); {y(#) ... }-paints the content shifted along the ordinate (y). After the block, the current point is set to (new x, old y); {xy(#)(#) ... }-paints the content with shifts along both x and y. After the block, the current point is set to (old x, old y); {f(fontname)(#) ... }-sets font fontname scaled by # (in fractions of 1/10 of the current …