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Revision 1.1.1.1 - (view) (download)
| 1 : | madgraph | 1.1 | c---------------------------------------------------------------------- |
| 2 : | C couplings.f | ||
| 3 : | c---------------------------------------------------------------------- | ||
| 4 : | c This files takes the inputs of the standard model from a Les Houches | ||
| 5 : | c file (param_card.dat) and calculates all the couplings that end up | ||
| 6 : | c in the Feynman rules, i.e., in the HELAS routines. | ||
| 7 : | c | ||
| 8 : | c With the convention of the New Web Generation MadEvent in this | ||
| 9 : | c part no non-trivial computation is made. The SM model secondary | ||
| 10 : | c parameters have been all calculated by the SM calculator, SMCalc | ||
| 11 : | c which produced param_card.dat. | ||
| 12 : | c | ||
| 13 : | c The only exception to the above rule is for alpha_S. In the case | ||
| 14 : | c where a pdf is used in the initial state, then the values as(MZ) | ||
| 15 : | c set in the les houches card is superseeded. | ||
| 16 : | c Scales and pdf's are set in the run_card.dat. | ||
| 17 : | c | ||
| 18 : | c This file contains the following routines: | ||
| 19 : | c | ||
| 20 : | c- madgraph original call to set the parameters | ||
| 21 : | c- lh_readin is called from here. | ||
| 22 : | c It talks to the lh_readin through the common block values. | ||
| 23 : | c subroutine setpara | ||
| 24 : | c | ||
| 25 : | c-routine to read the LH parameters in | ||
| 26 : | c subroutine lh_readin | ||
| 27 : | c | ||
| 28 : | c-to set | ||
| 29 : | c subroutine set_it(npara,ivalue,value,name,id, | ||
| 30 : | c subroutine case_trap(string,length) | ||
| 31 : | c subroutine no_spaces(buff,nchars) | ||
| 32 : | c---------------------------------------------------------------------- | ||
| 33 : | |||
| 34 : | |||
| 35 : | subroutine setpara | ||
| 36 : | c*********************************************************************** | ||
| 37 : | c This subroutine sets up the HELAS couplings of the STANDARD MODEL. | ||
| 38 : | c*********************************************************************** | ||
| 39 : | implicit none | ||
| 40 : | c | ||
| 41 : | c local | ||
| 42 : | c | ||
| 43 : | integer i | ||
| 44 : | real*8 dum | ||
| 45 : | c | ||
| 46 : | c common file with the couplings | ||
| 47 : | c | ||
| 48 : | include 'coupl.inc' | ||
| 49 : | c | ||
| 50 : | c local | ||
| 51 : | c | ||
| 52 : | double precision v | ||
| 53 : | double precision ee, ee2, ez, ey, sw, cw, sc2 | ||
| 54 : | double precision gwne, gwud, lambda, lam4, xt, rew, rqcd | ||
| 55 : | double precision alphas, alfa, alfaw, mfrun | ||
| 56 : | external alphas, alfa, alfaw, mfrun | ||
| 57 : | c | ||
| 58 : | c Common to lh_readin and printout | ||
| 59 : | c | ||
| 60 : | double precision alpha, sin2w, gfermi, alfas | ||
| 61 : | double precision mtMS,mbMS,mcMS,mtaMS!MSbar masses | ||
| 62 : | double precision Vud,Vus !CKM matrix elements | ||
| 63 : | common/values/ alpha,sin2w,gfermi,alfas, | ||
| 64 : | & mtMS,mbMS,mcMS,mtaMS, | ||
| 65 : | & Vud | ||
| 66 : | c | ||
| 67 : | c constants | ||
| 68 : | c | ||
| 69 : | double complex ci | ||
| 70 : | parameter( ci = ( 0.0d0, 1.0d0 ) ) | ||
| 71 : | double precision Zero, One, Two, Three, Four, Half, Rt2 | ||
| 72 : | parameter( Zero = 0.0d0, One = 1.0d0, Two = 2.0d0 ) | ||
| 73 : | parameter( Three = 3.0d0, Four = 4.0d0, Half = 0.5d0 ) | ||
| 74 : | parameter( Rt2 = 1.414213562d0 ) | ||
| 75 : | double precision Pi, Fourpi | ||
| 76 : | parameter( Pi = 3.14159265358979323846d0 ) | ||
| 77 : | parameter( Fourpi = Four * Pi ) | ||
| 78 : | c | ||
| 79 : | c alfas and run | ||
| 80 : | c | ||
| 81 : | include '../alfas.inc' | ||
| 82 : | include '../run.inc' | ||
| 83 : | c | ||
| 84 : | c------------------------------------------ | ||
| 85 : | c Start calculating the couplings for HELAS | ||
| 86 : | c------------------------------------------ | ||
| 87 : | c | ||
| 88 : | call lh_readin | ||
| 89 : | c | ||
| 90 : | c Strong coupling | ||
| 91 : | c | ||
| 92 : | c As a rule we first check if a pdf has been chosen in the | ||
| 93 : | c run_card.dat (which has been already read at this stage). | ||
| 94 : | c If there pdfs in the initial state, then the alpha_s(MZ) used | ||
| 95 : | c is set to the corresponding value. | ||
| 96 : | |||
| 97 : | if(scale.le.1d0) scale=zmass | ||
| 98 : | |||
| 99 : | if(lpp(1).ne.0.or.lpp(2).ne.0) then | ||
| 100 : | if(asmz .le.0.01d0) asmz =0.118d0 | ||
| 101 : | if(nloop.eq.0) nloop=1 | ||
| 102 : | else | ||
| 103 : | asmz=alfas !value read from the param_card.dat | ||
| 104 : | nloop=2 | ||
| 105 : | endif | ||
| 106 : | |||
| 107 : | G = DSQRT(4d0*PI*ALPHAS(SCALE)) ! use setting of the param_card.dat @ NLO | ||
| 108 : | GG(1) = -G | ||
| 109 : | GG(2) = -G | ||
| 110 : | c | ||
| 111 : | c auxiliary local values | ||
| 112 : | c | ||
| 113 : | cw = sqrt( One - sin2w ) | ||
| 114 : | ee2 = alpha * Fourpi | ||
| 115 : | sw = sqrt( sin2w ) | ||
| 116 : | ee = sqrt( ee2 ) | ||
| 117 : | ez = ee/(sw*cw) | ||
| 118 : | ey = ee*(sw/cw) | ||
| 119 : | sc2 = sin2w*( One - sin2w ) | ||
| 120 : | v = Two*wmass*sw/ee ! the wmass is used to calculate v | ||
| 121 : | lambda = hmass**2 / (Two * v**2) | ||
| 122 : | c | ||
| 123 : | c vector boson couplings | ||
| 124 : | c | ||
| 125 : | gw = ee/sw | ||
| 126 : | gwwa = ee | ||
| 127 : | gwwz = ee*cw/sw | ||
| 128 : | c | ||
| 129 : | c gauge & higgs boson coupling constants | ||
| 130 : | c | ||
| 131 : | gwwh = dcmplx( ee2/sin2w*Half*v, Zero ) | ||
| 132 : | gzzh = dcmplx( ee2/sc2*Half*v, Zero ) | ||
| 133 : | ghhh = dcmplx( -hmass**2/v*Three, Zero ) | ||
| 134 : | gwwhh = dcmplx( ee2/sin2w*Half, Zero ) | ||
| 135 : | gzzhh = dcmplx( ee2/sc2*Half, Zero) | ||
| 136 : | ghhhh = ghhh/v | ||
| 137 : | c | ||
| 138 : | c fermion-fermion-vector couplings | ||
| 139 : | c | ||
| 140 : | gal(1) = dcmplx( ee , Zero ) | ||
| 141 : | gal(2) = dcmplx( ee , Zero ) | ||
| 142 : | gau(1) = dcmplx( -ee*Two/Three, Zero ) | ||
| 143 : | gau(2) = dcmplx( -ee*Two/Three, Zero ) | ||
| 144 : | gad(1) = dcmplx( ee/Three , Zero ) | ||
| 145 : | gad(2) = dcmplx( ee/Three , Zero ) | ||
| 146 : | |||
| 147 : | gwf(1) = dcmplx( -ee/sqrt(Two*sin2w), Zero ) | ||
| 148 : | gwf(2) = dcmplx( Zero , Zero ) | ||
| 149 : | |||
| 150 : | gzn(1) = dcmplx( -ez*Half , Zero ) | ||
| 151 : | gzn(2) = dcmplx( Zero , Zero ) | ||
| 152 : | gzl(1) = dcmplx( -ez*(-Half + sin2w) , Zero ) | ||
| 153 : | gzl(2) = dcmplx( -ey , Zero ) | ||
| 154 : | gzu(1) = dcmplx( -ez*( Half - sin2w*Two/Three), Zero ) | ||
| 155 : | gzu(2) = dcmplx( ey*Two/Three , Zero ) | ||
| 156 : | gzd(1) = dcmplx( -ez*(-Half + sin2w/Three) , Zero ) | ||
| 157 : | gzd(2) = dcmplx( -ey/Three , Zero ) | ||
| 158 : | c | ||
| 159 : | c fermion-fermion-Higgs couplings (complex) hff(2) | ||
| 160 : | c | ||
| 161 : | c NOTE: the running mass is evaluated @ the same order | ||
| 162 : | c nloop of alpha_s set by the PDF choice | ||
| 163 : | c | ||
| 164 : | |||
| 165 : | if(mtMS.gt.1d0) then | ||
| 166 : | ghtop(1) = dcmplx( -mtMS/v, Zero ) | ||
| 167 : | else | ||
| 168 : | ghtop(1) = dcmplx( Zero,Zero) | ||
| 169 : | endif | ||
| 170 : | ghtop(2) = ghtop(1) | ||
| 171 : | |||
| 172 : | if(mbMS.gt.1d0) then | ||
| 173 : | ghbot(1) = dcmplx( -mbMS/v, Zero ) | ||
| 174 : | else | ||
| 175 : | ghbot(1) = dcmplx( Zero, Zero ) | ||
| 176 : | endif | ||
| 177 : | ghbot(2) = ghbot(1) | ||
| 178 : | |||
| 179 : | if(mcMS.gt.1d0) then | ||
| 180 : | ghcha(1) = dcmplx( -mbMS/v, Zero ) | ||
| 181 : | else | ||
| 182 : | ghcha(1) = dcmplx( Zero, Zero ) | ||
| 183 : | endif | ||
| 184 : | ghcha(2) = ghcha(1) | ||
| 185 : | |||
| 186 : | ghtau(1) = dcmplx( -mtaMS/v, Zero ) | ||
| 187 : | ghtau(2) = ghtau(1) | ||
| 188 : | c | ||
| 189 : | c CKM matrix: | ||
| 190 : | c symmetric 3x3 matrix, Vud=Vcs, Vus=Vcd Vcb=Vub=0 | ||
| 191 : | c | ||
| 192 : | c >>>>>>>>>>>>>>>***** NOTE****<<<<<<<<<<<<<<<<<<<<<<<<< | ||
| 193 : | c these couplings matter only when interaction_CKM.dat | ||
| 194 : | c is used to generate all the diagrams with off-diagonal | ||
| 195 : | c couplings. The default of MadEvent is a diagonal | ||
| 196 : | c CKM matrix. | ||
| 197 : | |||
| 198 : | Vus=DSQRT(1d0-Vud**2) | ||
| 199 : | do i=1,2 | ||
| 200 : | gwfc(i) = gwf(i)*Vud | ||
| 201 : | gwfs(i) = gwf(i)*Vus | ||
| 202 : | gwfm(i) =-gwf(i)*Vus | ||
| 203 : | enddo | ||
| 204 : | |||
| 205 : | c--------------------------------------------------------- | ||
| 206 : | c Set Photon Width to Zero, used by symmetry optimization | ||
| 207 : | c--------------------------------------------------------- | ||
| 208 : | |||
| 209 : | awidth = 0d0 | ||
| 210 : | |||
| 211 : | c---------------------------- | ||
| 212 : | c end subroutine coupsm | ||
| 213 : | c---------------------------- | ||
| 214 : | |||
| 215 : | |||
| 216 : | return | ||
| 217 : | end | ||
| 218 : | |||
| 219 : | subroutine lh_readin | ||
| 220 : | c---------------------------------------------------------------------- | ||
| 221 : | c Read the parameters from the lh file | ||
| 222 : | c | ||
| 223 : | c 1. Input values for the EW sector | ||
| 224 : | c 2. Higgs mass and width | ||
| 225 : | c 3. Fermion masses (pole and MSbar) and widths | ||
| 226 : | c---------------------------------------------------------------------- | ||
| 227 : | implicit none | ||
| 228 : | c | ||
| 229 : | c parameters | ||
| 230 : | c | ||
| 231 : | integer maxpara | ||
| 232 : | parameter (maxpara=100) | ||
| 233 : | c | ||
| 234 : | c local | ||
| 235 : | c | ||
| 236 : | integer npara,l1,l2,id | ||
| 237 : | character*132 buff | ||
| 238 : | real*8 real_value | ||
| 239 : | real*8 value(maxpara) | ||
| 240 : | integer ivalue(maxpara),n | ||
| 241 : | character*20 name(maxpara),bn | ||
| 242 : | logical block_found,done,fopened | ||
| 243 : | integer iunit,i,name_length,idum | ||
| 244 : | c | ||
| 245 : | c block info | ||
| 246 : | c | ||
| 247 : | character*20 block_name | ||
| 248 : | c | ||
| 249 : | c Common | ||
| 250 : | c | ||
| 251 : | include 'coupl.inc' | ||
| 252 : | c | ||
| 253 : | c Common to lh_readin and printout | ||
| 254 : | c | ||
| 255 : | double precision alpha, sin2w, gfermi, alfas | ||
| 256 : | double precision mtMS,mbMS,mcMS,mtaMS!MSbar masses | ||
| 257 : | double precision Vud,Vus !CKM matrix elements | ||
| 258 : | common/values/ alpha,sin2w,gfermi,alfas, | ||
| 259 : | & mtMS,mbMS,mcMS,mtaMS, | ||
| 260 : | & Vud | ||
| 261 : | c | ||
| 262 : | c---------- | ||
| 263 : | c start | ||
| 264 : | c---------- | ||
| 265 : | c | ||
| 266 : | c open file | ||
| 267 : | c | ||
| 268 : | iunit=14 | ||
| 269 : | call open_file(iunit,'param_card.dat',fopened) | ||
| 270 : | done=.false. | ||
| 271 : | |||
| 272 : | n=0 | ||
| 273 : | do while(.not.done) | ||
| 274 : | block_found=.false. | ||
| 275 : | c | ||
| 276 : | c looks for the blocks or for decay | ||
| 277 : | c | ||
| 278 : | do while(.not.block_found) | ||
| 279 : | read(iunit,'(a132)',end=99,err=99) buff | ||
| 280 : | c-- change to lower case | ||
| 281 : | call case_trap(buff,20) | ||
| 282 : | if(buff(1:5).eq.'block') then | ||
| 283 : | if(index(buff,"#").ne.0) l1=index(buff,"#")-1 | ||
| 284 : | block_name=buff(6:min(l1,26)) | ||
| 285 : | call no_spaces(block_name,name_length) | ||
| 286 : | c write(*,*) block_name(1:name_length) | ||
| 287 : | block_found=.true. | ||
| 288 : | elseif(buff(1:5).eq.'decay') then | ||
| 289 : | n=n+1 | ||
| 290 : | l1=30 | ||
| 291 : | if(index(buff,"#").ne.0) l1=index(buff,"#")-1 ! ignore comments | ||
| 292 : | read(buff(6:l1),*) ivalue(n),value(n) | ||
| 293 : | name(n)="decay" | ||
| 294 : | endif | ||
| 295 : | end do | ||
| 296 : | c | ||
| 297 : | c | ||
| 298 : | if(block_found) then | ||
| 299 : | do while(.true.) | ||
| 300 : | read(iunit,'(a132)',end=99,err=99) buff | ||
| 301 : | call case_trap(buff,20) | ||
| 302 : | if(buff(1:1).eq.'b'.or.buff(1:1).eq.'d') then | ||
| 303 : | backspace iunit | ||
| 304 : | exit | ||
| 305 : | endif | ||
| 306 : | if(buff(1:1).ne.'#') then !if it not a comment | ||
| 307 : | n=n+1 | ||
| 308 : | l1=30 | ||
| 309 : | if(index(buff,"#").ne.0) l1=index(buff,"#")-1 ! ignore comments | ||
| 310 : | c | ||
| 311 : | c WARNING:... not all blocks have the same sintax!! You need to change it | ||
| 312 : | c depending on the block you are reading | ||
| 313 : | c | ||
| 314 : | if(block_name(1:5).eq."mgckm") then | ||
| 315 : | read(buff(1:l1),*) ivalue(n),idum,value(n) | ||
| 316 : | else | ||
| 317 : | read(buff(1:l1),*) ivalue(n),value(n) | ||
| 318 : | endif | ||
| 319 : | name(n)=block_name(1:name_length) | ||
| 320 : | c write(*,"(1x,i2,2x,e16.8,1x,a)") | ||
| 321 : | c & ivalue(n),value(n),name(n) | ||
| 322 : | endif | ||
| 323 : | end do ! do while in the block | ||
| 324 : | else | ||
| 325 : | done=.true. | ||
| 326 : | endif | ||
| 327 : | end do ! do while the entire file | ||
| 328 : | |||
| 329 : | |||
| 330 : | 99 continue | ||
| 331 : | |||
| 332 : | bn="sminputs" | ||
| 333 : | call set_it(n,ivalue,value,name,1,bn,alpha,128.9d0) | ||
| 334 : | alpha=1d0/alpha | ||
| 335 : | call set_it(n,ivalue,value,name,2,bn,gfermi,0.1166d-4) | ||
| 336 : | call set_it(n,ivalue,value,name,3,bn,alfas,0.119d0) | ||
| 337 : | call set_it(n,ivalue,value,name,4,bn,zmass,91.188d0) | ||
| 338 : | call set_it(n,ivalue,value,name,6,bn,tmass,174.3d0) | ||
| 339 : | call set_it(n,ivalue,value,name,7,bn,lmass,1.777d0) | ||
| 340 : | bn="mgsmparam" | ||
| 341 : | call set_it(n,ivalue,value,name,1,bn,sin2w,0.2312d0) | ||
| 342 : | call set_it(n,ivalue,value,name,2,bn,wmass,80.419d0) | ||
| 343 : | bn="mgyukawa" | ||
| 344 : | call set_it(n,ivalue,value,name,4,bn,mcMS,1.25d0) | ||
| 345 : | call set_it(n,ivalue,value,name,5,bn,mbMS,4.2d0) | ||
| 346 : | call set_it(n,ivalue,value,name,6,bn,mtMS,174d0) | ||
| 347 : | call set_it(n,ivalue,value,name,15,bn,mtaMS,1.777d0) | ||
| 348 : | bn="mgckm" | ||
| 349 : | call set_it(n,ivalue,value,name,1,bn,vud,1d0) | ||
| 350 : | bn="mass" | ||
| 351 : | call set_it(n,ivalue,value,name,4,bn,cmass,1.4d0) | ||
| 352 : | call set_it(n,ivalue,value,name,5,bn,bmass,4.7d0) | ||
| 353 : | call set_it(n,ivalue,value,name,6,bn,tmass,tmass*1d0) | ||
| 354 : | call set_it(n,ivalue,value,name,15,bn,lmass,lmass*1d0) | ||
| 355 : | call set_it(n,ivalue,value,name,25,bn,hmass,120d0) | ||
| 356 : | call set_it(n,ivalue,value,name,23,bn,zmass,zmass*1d0) | ||
| 357 : | call set_it(n,ivalue,value,name,24,bn,wmass,wmass*1d0) | ||
| 358 : | bn="decay" | ||
| 359 : | call set_it(n,ivalue,value,name,6,bn,twidth,1.5083d0) | ||
| 360 : | call set_it(n,ivalue,value,name,25,bn,hwidth,0.0037d0) | ||
| 361 : | call set_it(n,ivalue,value,name,23,bn,zwidth,2.441d0) | ||
| 362 : | call set_it(n,ivalue,value,name,24,bn,wwidth,2.0476d0) | ||
| 363 : | |||
| 364 : | return | ||
| 365 : | end | ||
| 366 : | |||
| 367 : | |||
| 368 : | subroutine set_it(npara,ivalue,value,name,id, | ||
| 369 : | & block_name,var,def_value) | ||
| 370 : | c---------------------------------------------------------------------------------- | ||
| 371 : | c finds the parameter value in block_name and associate var to it. | ||
| 372 : | c If it is not found a default is given. | ||
| 373 : | c---------------------------------------------------------------------------------- | ||
| 374 : | implicit none | ||
| 375 : | |||
| 376 : | c | ||
| 377 : | c parameters | ||
| 378 : | c | ||
| 379 : | integer maxpara | ||
| 380 : | parameter (maxpara=100) | ||
| 381 : | c | ||
| 382 : | c arguments | ||
| 383 : | c | ||
| 384 : | integer npara,ivalue(maxpara),id | ||
| 385 : | character*20 block_name,name(maxpara) | ||
| 386 : | real*8 var,def_value,value(maxpara) | ||
| 387 : | c | ||
| 388 : | c local | ||
| 389 : | c | ||
| 390 : | logical found | ||
| 391 : | integer i | ||
| 392 : | c | ||
| 393 : | c start | ||
| 394 : | c | ||
| 395 : | found=.false. | ||
| 396 : | do i=1,npara | ||
| 397 : | found = (id.eq.ivalue(i)).and.(name(i).eq.block_name) | ||
| 398 : | if(found) then | ||
| 399 : | var=value(i) | ||
| 400 : | exit | ||
| 401 : | endif | ||
| 402 : | enddo | ||
| 403 : | |||
| 404 : | if (.not.found) then | ||
| 405 : | c write (*,*) "Warning: parameter not found" | ||
| 406 : | c write (*,*) " setting it to default value ",def_value | ||
| 407 : | var=def_value | ||
| 408 : | endif | ||
| 409 : | return | ||
| 410 : | |||
| 411 : | end | ||
| 412 : | |||
| 413 : | |||
| 414 : | subroutine case_trap(string,length) | ||
| 415 : | c********************************************************** | ||
| 416 : | c change string to lowercase if the input is not | ||
| 417 : | c********************************************************** | ||
| 418 : | implicit none | ||
| 419 : | c | ||
| 420 : | c ARGUMENT | ||
| 421 : | c | ||
| 422 : | character*(*) string | ||
| 423 : | integer length | ||
| 424 : | c | ||
| 425 : | c LOCAL | ||
| 426 : | c | ||
| 427 : | integer i,k | ||
| 428 : | |||
| 429 : | do i=1,length | ||
| 430 : | k=ichar(string(i:i)) | ||
| 431 : | if(k.ge.65.and.k.le.90) then !upper case A-Z | ||
| 432 : | k=ichar(string(i:i))+32 | ||
| 433 : | string(i:i)=char(k) | ||
| 434 : | endif | ||
| 435 : | enddo | ||
| 436 : | |||
| 437 : | return | ||
| 438 : | end | ||
| 439 : | |||
| 440 : | |||
| 441 : | subroutine no_spaces(buff,nchars) | ||
| 442 : | c********************************************************************** | ||
| 443 : | c Given buff a buffer of words separated by spaces | ||
| 444 : | c returns it where all space are moved to the right | ||
| 445 : | c returns also the length of the single word. | ||
| 446 : | c maxlength is the length of the buffer | ||
| 447 : | c********************************************************************** | ||
| 448 : | implicit none | ||
| 449 : | c | ||
| 450 : | c Constants | ||
| 451 : | c | ||
| 452 : | integer maxline | ||
| 453 : | parameter (maxline=20) | ||
| 454 : | character*1 null | ||
| 455 : | parameter (null=' ') | ||
| 456 : | c | ||
| 457 : | c Arguments | ||
| 458 : | c | ||
| 459 : | character*(maxline) buff | ||
| 460 : | integer nchars,maxlength | ||
| 461 : | c | ||
| 462 : | c Local | ||
| 463 : | c | ||
| 464 : | integer i,j | ||
| 465 : | character*(maxline) temp | ||
| 466 : | c----- | ||
| 467 : | c Begin Code | ||
| 468 : | c----- | ||
| 469 : | nchars=0 | ||
| 470 : | c write (*,*) "buff=",buff(1:maxlength) | ||
| 471 : | do i=1,maxline | ||
| 472 : | if(buff(i:i).ne.null) then | ||
| 473 : | nchars=nchars+1 | ||
| 474 : | temp(nchars:nchars)=buff(i:i) | ||
| 475 : | endif | ||
| 476 : | c write(*,*) i,":",buff(1:maxlength),":",temp(1:nchars),":" | ||
| 477 : | enddo | ||
| 478 : | buff=temp | ||
| 479 : | end | ||
| 480 : | |||
| 481 : |
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