# pp > ZZ jj with NLO

I want to generate VBF process,

p p > z z* j j

where the zz*->4l. I want to have NLO precision.

The command I am using is,

generate p p > j j l+ l- l+ l- QCD=0 QED=6 [QCD]

It runs hours and use about 90% memory of my desktop (total memory 8 GB). I stopped the code in order not to crash my machine. Any idea? Log file is below.

* *

* VERSION 2.1.2 2014-07-03 *

* *

* The MadGraph5_aMC@NLO Development Team - Find us at *

* https:/

* and *

* http://

* *

* Type 'help' for in-line help. *

* Type 'tutorial' to learn how MG5 works *

* Type 'tutorial aMCatNLO' to learn how aMC@NLO works *

* Type 'tutorial MadLoop' to learn how MadLoop works *

* *

*******

load MG5 configuration from input/mg5_

lhapdf-config does not seem to correspond to a valid lhapdf-config executable.

Please set the 'lhapdf' variable to the (absolute) /PATH/TO/

Note that you can still compile and run aMC@NLO with the built-in PDFs

MG5_aMC> set lhapdf /PATH/TO/

fastjet-config does not seem to correspond to a valid fastjet-config executable (v3+). We will use fjcore instead.

Please set the 'fastjet'variable to the full (absolute) /PATH/TO/

MG5_aMC> set fastjet /PATH/TO/

Using default eps viewer "evince". Set another one in ./input/

Using default web browser "firefox". Set another one in ./input/

import /home/haifeng/

The import format was not given, so we guess it as command

import model sm

INFO: Restrict model sm with file models/

INFO: Run "set stdout_level DEBUG" before import for more information.

INFO: Change particles name to pass to MG5 convention

Defined multiparticle p = g u c d s u~ c~ d~ s~

Defined multiparticle j = g u c d s u~ c~ d~ s~

Defined multiparticle l+ = e+ mu+

Defined multiparticle l- = e- mu-

Defined multiparticle vl = ve vm vt

Defined multiparticle vl~ = ve~ vm~ vt~

Defined multiparticle all = g u c d s u~ c~ d~ s~ a ve vm vt e- mu- ve~ vm~ vt~ e+ mu+ t b t~ b~ z w+ h w- ta- ta+

define p = u d s u~ d~ s~

Defined multiparticle p = u d s u~ d~ s~

define j = u d s c u~ d~ s~ c~

Defined multiparticle j = u d s c u~ d~ s~ c~

define l+ = mu+

Defined multiparticle l+ = mu+

define l- = mu-

Defined multiparticle l- = mu-

define vl = ve vm vt

Defined multiparticle vl = ve vm vt

define vl~ = ve~ vm~ vt~

Defined multiparticle vl~ = ve~ vm~ vt~

generate p p > j j l+ l- l+ l- QCD=0 QED=6 [QCD]

The default sm model does not allow to generate loop processes. MG5_aMC now loads 'loop_sm' instead.

import model loop_sm

INFO: Restrict model loop_sm with file models/

INFO: Run "set stdout_level DEBUG" before import for more information.

INFO: Change particles name to pass to MG5 convention

Kept definitions of multiparticles l- / j / vl / l+ / p / vl~ unchanged

Defined multiparticle all = g gh gh~ d u s c d~ u~ s~ c~ a ve vm vt e- mu- ve~ vm~ vt~ e+ mu+ b t b~ t~ z w+ h w- ta- ta+

WARNING: Process: u/d/s/u~/d~/s~ u/d/s/u~/d~/s~ > u/d/s/c/u~/d~/s~/c~ u/d/s/c/u~/d~/s~/c~ mu+ mu- mu+ mu- QCD=0 QED=6 [ all = QCD ] can have real emission processes which are not finite.

To avoid this, please use multiparticles when generating the process and be sure to include all the following particles in the multiparticle definition:

g, c, s, u, d, d~, u~, s~, c~

INFO: Generating FKS-subtracted matrix elements for born process: u u > u u mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (1 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: u d > u d mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (2 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: u s > u s mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (3 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: u s > d c mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (4 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: u u~ > u u~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (5 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: u u~ > d d~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (6 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: u u~ > s s~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (7 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: u u~ > c c~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (8 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: u d~ > u d~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (9 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: u d~ > c s~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (10 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: u s~ > u s~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (11 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: d u > u d mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (12 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: d d > d d mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (13 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: d s > d s mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (14 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: d u~ > d u~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (15 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: d u~ > s c~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (16 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: d d~ > u u~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (17 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: d d~ > d d~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (18 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: d d~ > s s~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (19 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: d d~ > c c~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (20 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: d s~ > u c~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (21 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: d s~ > d s~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (22 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: s u > u s mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (23 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: s u > d c mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (24 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: s d > d s mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (25 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: s s > s s mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (26 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: s u~ > s u~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (27 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: s d~ > s d~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (28 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: s d~ > c u~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (29 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: s s~ > u u~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (30 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: s s~ > d d~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (31 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: s s~ > s s~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (32 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: s s~ > c c~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (33 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: u~ u > u u~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (34 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: u~ u > d d~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (35 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: u~ u > s s~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (36 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: u~ u > c c~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (37 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: u~ d > d u~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (38 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: u~ d > s c~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (39 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: u~ s > s u~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (40 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: u~ u~ > u~ u~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (41 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: u~ d~ > u~ d~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (42 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: u~ s~ > u~ s~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (43 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: u~ s~ > d~ c~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (44 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: d~ u > u d~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (45 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: d~ u > c s~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (46 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: d~ d > u u~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (47 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: d~ d > d d~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (48 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: d~ d > s s~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (49 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: d~ d > c c~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (50 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: d~ s > s d~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (51 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: d~ s > c u~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (52 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: d~ u~ > u~ d~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (53 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: d~ d~ > d~ d~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (54 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: d~ s~ > d~ s~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (55 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: s~ u > u s~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (56 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: s~ d > u c~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (57 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: s~ d > d s~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (58 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: s~ s > u u~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (59 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: s~ s > d d~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (60 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: s~ s > s s~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (61 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: s~ s > c c~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (62 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: s~ u~ > u~ s~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (63 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: s~ u~ > d~ c~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (64 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: s~ d~ > d~ s~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (65 / 66)

INFO: Generating FKS-subtracted matrix elements for born process: s~ s~ > s~ s~ mu+ mu- mu+ mu- QED=6 QCD=0 [ QCD ] (66 / 66)

INFO: Generating virtual matrix elements using MadLoop:

INFO: Generating virtual matrix element with MadLoop for process: u u > mu+ mu- mu+ mu- u u QED=6 QCD=0 [ QCD ] (1 / 66)

## Question information

- Language:
- English Edit question

- Status:
- Open

- Assignee:
- marco zaro Edit question

- Last query:
- 2014-10-17

- Last reply:
- 2014-09-18

marco zaro (marco-zaro) said : | #1 |

Dear Haifeng,

this process is currently beyond the capabilities of our code.

Not only for memory usage, but also because of phase space problems...

We will come back to you when we think that electroweak production of 4lep +jj is feasible.

Thanks for your question,

Marco

Haifeng Li (haifengde) said : | #2 |

Dear Macro,

I saw you have new verison of aMC@NLO (2.2.1). Can aMC@NLO do 4lep +jj at NLO now?

Best, Haifeng

## Can you help with this problem?

Provide an answer of your own, or ask Haifeng Li for more information if necessary.