MadGraph5_aMC@NLO

lhapdf6 vs ee-collider

Asked by said ghourmin

Hi,
one of problem that i face in madgraph is when i try to run lhapdf6 interface with madgraph to calculate cross section of electron-electron collider processes i recieve this error below but for p-p collider process lhapdf6 fonction without any error. my question is lhapdf6 is usefull to calculate cross section at e-e collider?

here the error that i recieve bellow

terminate called after throwing an instance of 'LHAPDF::UserError'
  what(): Trying to use LHAGLUE set #1 but it is not initialised

Program received signal SIGABRT: Process abort signal.

Backtrace for this error:
#0 0x7f6acb58332a
#1 0x7f6acb582503
#2 0x7f6acabfff1f
#3 0x7f6acabffe97
#4 0x7f6acac01800
#5 0x7f6acb9d3956
#6 0x7f6acb9d9ae5
#7 0x7f6acb9d9b20
#8 0x7f6acb9d9d53
#9 0x55cf24965b0b
#10 0x55cf24965c80
#11 0x55cf24952602
#12 0x55cf249257ae
#13 0x55cf24920857
#14 0x55cf2492b97f
#15 0x55cf2492c526
#16 0x55cf2493e2c5
#17 0x55cf2491125d
#18 0x55cf249113d0
#19 0x7f6acabe2b96
#20 0x55cf2490f329
#21 0xffffffffffffffff
rm: cannot remove 'results.dat': No such file or directory
ERROR DETECTED
terminate called after throwing an instance of 'LHAPDF::UserError'
  what(): Trying to use LHAGLUE set #1 but it is not initialised

Program received signal SIGABRT: Process abort signal.

Backtrace for this error:
#0 0x7f69eb43d32a
#1 0x7f69eb43c503
#2 0x7f69eaab9f1f
#3 0x7f69eaab9e97
#4 0x7f69eaabb800
#5 0x7f69eb88d956
#6 0x7f69eb893ae5
#7 0x7f69eb893b20
#8 0x7f69eb893d53
#9 0x560731b8bb0b
#10 0x560731b8bc80
#11 0x560731b78602
#12 0x560731b4b7ae
#13 0x560731b46857
#14 0x560731b5197f
#15 0x560731b52526
#16 0x560731b642c5
#17 0x560731b3725d
#18 0x560731b373d0
#19 0x7f69eaa9cb96
#20 0x560731b35329
#21 0xffffffffffffffff
rm: cannot remove 'results.dat': No such file or directory
ERROR DETECTED
INFO: Idle: 0, Running: 0, Completed: 1 [ 0.37s ]
INFO: Idle: 0, Running: 0, Completed: 1 [ 0.37s ]
INFO: End survey
refine 10000
Creating Jobs
INFO: Refine results to 10000
INFO: Generating 10000.0 unweighted events.
Error when reading /home/said/Downloads/MG5_aMC_v2_9_12/bin/tst/SubProcesses/P1_ll_ttx/G1/results.dat
Command "generate_events run_01" interrupted with error:
Exception : Reported error: End code 134.0
  Full associated log:
  Process in group number 1
  No PDF is used, alpha_s(MZ) from param_card is used
  Value of alpha_s from param_card: 0.11799999999999999
  The default order of alpha_s running is fixed to 2
  Define smin to 119716.00000000000
  *****************************************************
  * MadGraph/MadEvent *
  * -------------------------------- *
  * http://madgraph.hep.uiuc.edu *
  * http://madgraph.phys.ucl.ac.be *
  * http://madgraph.roma2.infn.it *
  * -------------------------------- *
  * *
  * PARAMETER AND COUPLING VALUES *
  * *
  *****************************************************

   External Params
   ---------------------------------

  aEWM1 = 132.50700000000001
  mdl_Gf = 1.1663900000000000E-005
  aS = 0.11799999999999999
  mdl_ymb = 4.7000000000000002
  mdl_ymt = 173.00000000000000
  mdl_ymtau = 1.7769999999999999
  mdl_MZ = 91.188000000000002
  mdl_MT = 173.00000000000000
  mdl_MB = 4.7000000000000002
  mdl_MH = 125.00000000000000

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

non delta beam for e+e- collider is certainly not something supported within the LTS branch.
In the feature release we started to support more exotic electron pdf.
In the latest version, we do propose a series of PDF but those are NOT linked to lhapdf.
In the next release (3.5.0) we will allow link to eMELA (which is linked to lhapdf).

Again a "simple" lhapdf call is not going to be supported. The issue is that the phase-space integration for ee pdf can not be done like for the case for pp. In addition to the functional form pdf, we need some additional metadata on the pdf to tell us how the phase-space integration needs to be done. So far I do not know if such information does exists or not (and if it is we will likely need to wait at least 3.6.0 before being able to use it).

Cheers,

Olivier

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