# 1-loop QCD correction for e-p collide

Could Madgraph calculate 1-loop QCD correction for e-p collide, such as e u -> e higgs u [QCD]?

We encounter a problem like this when calculate the processes:

Command "generate e p > e u [QCD]" interrupted with error: InvalidCmd : No particle e in model.

Thanks very much for helping!

## Question information

- Language:
- English Edit question

- Status:
- Answered

- Assignee:
- No assignee Edit question

- Last query:
- 2019-10-21

- Last reply:
- 2019-10-21

Hi,

1) Deep Inelastic is indeed not supported.

2) Your error is not related to that

"e" is not a particle defined in the model.

(You can use e- or e+)

if you want to use either "e-" or "e+"

you should use

define e = e+ e-

3) @NLO, you should not specify a specific quark flavor "u", you should use "j" or "p"

So if deep inelastic was supported the correct syntax would have been

define e = e+ e-

generate p e > e j [QCD]

output

launch

(Here the launch will fail within some pole check since our substraction method does not support deep inelastic scattering)

Cheers,

Olivier

> On 21 Oct 2019, at 10:32, Xiang Lv <email address hidden> wrote:

>

> New question #685300 on MadGraph5_aMC@NLO:

> https:/

>

> Could Madgraph calculate 1-loop QCD correction for e-p collide, such as e u -> e higgs u [QCD]?

> We encounter a problem like this when calculate the processes:

> Command "generate e p > e u [QCD]" interrupted with error: InvalidCmd : No particle e in model.

> Thanks very much for helping!

>

>

>

> --

> You received this question notification because you are an answer

> contact for MadGraph5_aMC@NLO.

Xiang Lv (xiang123) said : | #2 |

OK. I got it! Thank you very much!

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