# regarding generating new physics contributions at NLO level in madgraph

Hi,

I am trying to compute the full BSM contribution to t t~ at one loop in QCD.

I am proceeding this through the command : p p > t t~ [QCD] NEW=99 QCD=99,

however this is giving me still the contributions due to QCD, I also tried other variants, for ex NEW=2 etc

but none is working. It gives me only QCD contribution:

generate p p > t t~ / z a [QCD] NEW=2

Interpreting 'NEW=2' as 'NEW<=2'

INFO: Generating FKS-subtracted matrix elements for born process: g g > t t~ NEW<=2 [ all = QCD ] / z a (1 / 9)

INFO: Generating FKS-subtracted matrix elements for born process: u u~ > t t~ NEW<=2 [ all = QCD ] / z a (2 / 9)

INFO: Generating FKS-subtracted matrix elements for born process: c c~ > t t~ NEW<=2 [ all = QCD ] / z a (3 / 9)

INFO: Generating FKS-subtracted matrix elements for born process: d d~ > t t~ NEW<=2 [ all = QCD ] / z a (4 / 9)

INFO: Generating FKS-subtracted matrix elements for born process: s s~ > t t~ NEW<=2 [ all = QCD ] / z a (5 / 9)

INFO: Generating FKS-subtracted matrix elements for born process: u~ u > t t~ NEW<=2 [ all = QCD ] / z a (6 / 9)

INFO: Generating FKS-subtracted matrix elements for born process: c~ c > t t~ NEW<=2 [ all = QCD ] / z a (7 / 9)

INFO: Generating FKS-subtracted matrix elements for born process: d~ d > t t~ NEW<=2 [ all = QCD ] / z a (8 / 9)

INFO: Generating FKS-subtracted matrix elements for born process: s~ s > t t~ NEW<=2 [ all = QCD ] / z a (9 / 9)

INFO: Generating virtual matrix elements using MadLoop:

INFO: Generating virtual matrix element with MadLoop for process: g g > t t~ NEW=0 QCD<=2 [ all = QCD ] / z a (1 / 9)

INFO: Generating virtual matrix elements using MadLoop:

INFO: Generating virtual matrix element with MadLoop for process: u u~ > t t~ NEW=0 QCD<=2 [ all = QCD ] / z a (2 / 9)

INFO: Generating virtual matrix elements using MadLoop:

INFO: Generating virtual matrix element with MadLoop for process: c c~ > t t~ NEW=0 QCD<=2 [ all = QCD ] / z a (3 / 9)

INFO: Generating virtual matrix elements using MadLoop:

INFO: Generating virtual matrix element with MadLoop for process: d d~ > t t~ NEW=0 QCD<=2 [ all = QCD ] / z a (4 / 9)

INFO: Generating virtual matrix elements using MadLoop:

INFO: Generating virtual matrix element with MadLoop for process: s s~ > t t~ NEW=0 QCD<=2 [ all = QCD ] / z a (5 / 9)

INFO: Generating virtual matrix elements using MadLoop:

INFO: Generating virtual matrix element with MadLoop for process: u~ u > t t~ NEW=0 QCD<=2 [ all = QCD ] / z a (6 / 9)

INFO: Generating virtual matrix elements using MadLoop:

INFO: Generating virtual matrix element with MadLoop for process: c~ c > t t~ NEW=0 QCD<=2 [ all = QCD ] / z a (7 / 9)

INFO: Generating virtual matrix elements using MadLoop:

INFO: Generating virtual matrix element with MadLoop for process: d~ d > t t~ NEW=0 QCD<=2 [ all = QCD ] / z a (8 / 9)

INFO: Generating virtual matrix elements using MadLoop:

INFO: Generating virtual matrix element with MadLoop for process: s~ s > t t~ NEW=0 QCD<=2 [ all = QCD ] / z a (9 / 9)

INFO: Generated 9 subprocesses with 136 real emission diagrams, 11 born diagrams and 124 virtual diagrams

AT LO, I tried to omit and add QED contributions which happen very nicely either by using QED=2/99

But my new physics contribution exists at one loop, and I am unable to generate the events together, this is crucial for me since I need the interference terms. Can you please help me in this regard?

Thanks,

Disha

## Question information

- Language:
- English Edit question

- Status:
- Answered

- Assignee:
- No assignee Edit question

- Last query:

- Last reply:

## Can you help with this problem?

Provide an answer of your own, or ask Disha Bhatia for more information if necessary.