********************************************************************************Colliding beams as a source can be specified via command SPECSOUR andSDUMequal to PPSOURCE or ppsource, CROSSASY or CROSSSYM. One of the two colliding beams (from now on the "first beam") is a beam of hadrons (including protons or heavier nuclei), the other one (the "second beam") is a beam of protons or heavier nuclei but not of other hadrons. The differentSDUMvalues allow to define the two beams in different ways. The first and the second continuation cards are identical for allSDUMoptions. ForSDUM= PPSOURCE or ppsource: First card:WHAT(1)= lab momentum x-component for hadrons or nuclei of the first beam (GeV/c)WHAT(2)= lab momentum y-component for hadrons or nuclei of the first beam (GeV/c)WHAT(3)= lab momentum z-component for hadrons or nuclei of the first beam (GeV/c)WHAT(4)= lab momentum x-component for protons or nuclei of the 2^{nd}beam (GeV/c)WHAT(5)= lab momentum y-component for protons or nuclei of the 2^{nd}beam (GeV/c)WHAT(6)= lab momentum z-component for protons or nuclei of the 2^{nd}beam (GeV/c)SDUM: PPSOURCE or ppsource First continuation card:WHAT(1)= sigma_x (cm) for the Gaussian sampling of the interaction position around XBEAM (the x position defined in the BEAMPOSit card)WHAT(2)= sigma_y (cm) for the Gaussian sampling of the interaction position around YBEAM (the y position defined in the BEAMPOSit card)WHAT(3)= sigma_z (cm) for the Gaussian sampling of the interaction position around ZBEAM (the z position defined in the BEAMPOSit card)WHAT(4)= sampling limit, in sigma, applying along x, y, and z =< 0: ignored (no limit)WHAT(5)= particle id number (or corresponding name) of hadrons of the first beamDefault: as defined by the BEAM card (and by the HI-PROPErt card in case it is a heavy ion)WHAT(6)= mass number of the nuclei of the second beam = 0: it is a proton beam, andWHAT(1)of the second continuation card - if present - is ignoredSDUM= "&" in any position in column 71 to 78 (or in the last field if free format is used) Second continuation card (only needed if the second is a heavy ion beam):WHAT(1)= atomic number of the nuclei of the second beamWHAT(2): specifies the divergence of the first beam in the crossing plane (in rad): sigma_th_C for the Gaussian sampling of the angle between the direction of the particle and the most probable direction as defined by WHAT(1-3) of the first cardWHAT(3): specifies the divergence of the first beam in the orthogonal plane (in rad): sigma_th_O for the Gaussian sampling of the angle between the direction of the particle and the most probable direction as defined by WHAT(1-3) of the first cardWHAT(4): specifies the divergence of the second beam in the crossing plane (in rad): sigma_th_C for the Gaussian sampling of the angle between the direction of the particle and the most probable direction as defined by WHAT(4-6) of the first cardWHAT(5): specifies the divergence of the second beam in the orthogonal plane (in rad): sigma_th_O for the Gaussian sampling of the angle between the direction of the particle and the most probable direction as defined by WHAT(4-6) of the first cardWHAT(6): flag for interactions to be sampled i0 + i1 * 10 + i2 * 100 0 = default, nuclear nonelastic + EMD if selected with the physics card otherwise: i0 = flag for nuclear nonelastic interactions i1 = flag for nuclear elastic interactions i2 = flag for electromagnetic dissociation interactionsSDUM= "&&" in any position in column 71 to 78 (or in the last field if free format is used) ForSDUM= CROSSASY (asymmetric crossing): First card:WHAT(1)= lab momentum of hadrons or nuclei of the first beam (GeV/c)WHAT(2)= polar angle (rad) between the momentum of hadrons or nuclei of the first beam and the z (positive) direction (must be between 0 and pi/2)WHAT(3)= azimuthal angle (deg) defining the crossing plane (see Note 2 below)WHAT(4)= lab momentum of protons or nuclei of the second beam (GeV/c)WHAT(5)= polar angle (rad) between the momentum of protons or nuclei of the second beam and the -z (negative) direction (must be between 0 and pi/2)WHAT(6)= not usedSDUM: not used First and second continuation cards: as forSDUM= PPSOURCE (see above) ForSDUM= CROSSSYM (symmetric crossing): First card:WHAT(1)= lab momentum for protons or nuclei of both beams (GeV/c) (see Note 3)WHAT(2)= half crossing angle (rad) (must be between 0 and pi/2)WHAT(3)= azimuthal angle (deg) defining the crossing plane (see Note 2)WHAT(4)-WHAT(6): not used First and second continuation cards: as forSDUM= PPSOURCE (see above)Notes:1) When SPECSOUR is used to define two colliding beams (SDUM= PPSOURCE, CROSSASY or CROSSSYM), DPMJET must be linked through the script $FLUPRO/flutil/ldpmqmd. A card PHYSICS withSDUM= LIMITS sets the maximum CMS momentum (GeV/c) inWHAT(1)for DPMJET initialization purposes. 2) WithSDUM= CROSSASY and CROSSSYM, the half plane containing the two proton momenta at the sampled interaction point (XXX, YYY, ZZZ) is assumed to be limited by an axis z' passing through (XXX, YYY) and parallel to the z-axis. Polar and azimuthal angles are defined with respect to z', withWHAT(3)= 0 corresponding to the xz' half plane towards positive x,WHAT(3)= 90 corresponding to the yz' half plane towards positive y,WHAT(3)= 180 corresponding to the xz' half plane towards negative x,WHAT(3)= 270 corresponding to the yz' half plane towards negative y. 3) WithSDUM= CROSSSYM, the particles of the two beams are identical and have the same momentum. They can only be protons or nuclei: other hadrons are excluded. 4) The particles produced in the interaction of two beams have generation number 1 (i.e., they are considered as primary particles) 5) All the scores in a run where the source consists of two colliding beams are normalised per beam interaction