An example of the input data cards

One example is presented with the following condition;

• process: $e^+ \,q \rightarrow e^+ \,q \,\,\mu^+ \mu^-$ ($q$= $\left\{\right.$$u$ $^{^{(}}$ $^{-}$ $^{^{)}}$,$d$ $^{^{^{(}}}$ $^{^-}$ $^{^{^{)}}}$,$s$ $^{^{(}}$ $^{-}$ $^{^{)}}$ $\left.\right\}$ with GRV94(LO)[#!GRV94!#]),
  
• BH diagrams only,
  
• 70% polarization of the $e^+$ beam in the direction of the proton beam,
  
• cuts: (1) $\&$ (2) $\&$ (3) $\&$ (4),
  
  • $Q^2_p > 1$GeV$^2$ & $M_{had}>5$GeV,
    
  • for scattered $q$, $\theta>10^{\circ}$ $\&$ P$_t >$ 15GeV/c,
    
  • (invariant mass of $\mu^+\mu^-$) $>$ 4GeV,
    
  • 2 of the following 3 requirements for the final state leptons are satisfied,
    • for $e^+$ : 5$^{\circ}$ $<\theta<$ 175$^{\circ}$ $\&$ P$_t >$ 5GeV,
      
    • for $\mu^+$: 20$^{\circ}$ $<\theta<$ 160$^{\circ}$ $\&$ P$_t >$ 3GeV,
      
    • for $\mu^-$: 20$^{\circ}$ $<\theta<$ 160$^{\circ}$ $\&$ P$_t >$ 3GeV.

Following is the corresponding grape.cards. The same file is put in the directory sample.

LIST
NCALL   1400000
C ======================================================================
C << Polarization of the Lepton Beam >>
C            (1)    (2)    (3)
EPOL         -0.7    0.     0.
C ======================================================================
C << Process in the Proton Vertex >>   (1:elastic, 2:quasi-elastic, 3:DIS)
PROCESS       3
C ======================================================================
C << Produced Lepton-pair >>   (1:di-e, 2:di-mu, 3:di-tau)
LPAIR         2
C ======================================================================
C << Scattered Quark in DIS >>
C   (1:u, 2:u-bar, 3:d, 4:d-bar, 5:s, 6:s-bar, 7:c, ... , 12:t-bar)
QFLV          1
MERGE    123456
C ======================================================================
C << PDF set in DIS >>   (See PDFLIB manual.)
NGROUP        5
NSET          5
C ======================================================================
C ######################################################################
C ======================================================================
C << Electroweak Dilepton Production >>
GRASEL        2
C ======================================================================
C ######################################################################
C ======================================================================
C << Mass Range for the Hadronic System >>  (only for quasi-elastic and DIS)
MHAD          5.   300.
C ------------
C << Q2 Range for the Proton Vertex >>
Q2P           1.     1.E20
C ------------
C << Cuts for each Final-state Particle >>
C           <p/q>  <e+->  <l-+>  <l+->
THMIN        10.     0.     0.     0.
THMAX       180.   180.   180.   180.
EMIN          0.     0.     0.     0.
EMAX          1.E20  1.E20  1.E20  1.E20
PMIN          0.     0.     0.     0.
PMAX          1.E20  1.E20  1.E20  1.E20
PTMIN        15.     0.     0.     0.
PTMAX         1.E20  1.E20  1.E20  1.E20
C ------------
C << Mass cuts >>
MASSLL        4.     1.E20
              0.     1.E20
C ------------
C << Cuts for One or Some of the Final-state Particles >>
IVISI         2
C           <p/q>  <e+->  <l-+>  <l+->
THEVMIN       0.     5.    20.    20.
THEVMAX       0.   175.   160.   160.
EVMIN         0.     0.     0.     0.
EVMAX         0.     1.E20  1.E20  1.E20
PTVMIN        0.     5.     3.     3.
PTVMAX        0.     1.E20  1.E20  1.E20
C ======================================================================
STOP