QCD renormalization and factorization scales

   Try  T(~X,~X)

   or

T(p*)    where p* is defined in "Aliases"

Best

    Alexander Pukhov

On 28.06.2019 8:17, Marco Merchand wrote:
> New question #681661 on CalcHEP:
> https://answers.launchpad.net/calchep/+question/681661
>
> Dear Calchep Experts
>
> I am studying the process p, p ->jet, ~X, ~X within the IDM and I want to set the QCD scale for renormalization and factorization Q to be equal to the transverse momentum, T(~X,~X), of the DM pair.
>
> I've read through the manuals and I found one can set it, e.g., via the GUI interface as Qren=T3+T4.
>
> I tried this but I am not getting the right answer. Is this the right approach ?
>
> With regard to the factorization where is the option to change it to what I need?
>
> Thanks
> Marco
>
>
>

Sorry, folr scale it has to be

T("p*")

Best

    Alexander Pukhov

On 01.07.2019 12:32, Alexander Pukhov wrote:
> Question #681661 on CalcHEP changed:
> https://answers.launchpad.net/calchep/+question/681661
>
> Status: Open => Answered
>
> Alexander Pukhov proposed the following answer:
>   Try  T(~X,~X)
>
>   or
>
> T(p*)    where p* is defined in "Aliases"
>
> Best
>
>    Alexander Pukhov
>
>
> On 28.06.2019 8:17, Marco Merchand wrote:
>> New question #681661 on CalcHEP:
>> https://answers.launchpad.net/calchep/+question/681661
>>
>> Dear Calchep Experts
>>
>> I am studying the process p, p ->jet, ~X, ~X within the IDM and I want to set the QCD scale for renormalization and factorization Q to be equal to the transverse momentum, T(~X,~X), of the DM pair.
>>
>> I've read through the manuals and I found one can set it, e.g., via the GUI interface as Qren=T3+T4.
>>
>> I tried this but I am not getting the right answer. Is this the right approach ?
>>
>> With regard to the factorization where is the option to change it to what I need?
>>
>> Thanks
>> Marco
>>
>>
>>

I tried using both T("~X","~X") and T("p*") and they work.

but they still don't give me the right answer. I'm off by about 2 orders of magnitude.

May be you need a cut  for  Pt of jet?

Wrong scale can not lead to  difference about  2 orders of magnitude.

Best

     Alexander Pukhov

On 01.07.2019 19:08, Marco Merchand wrote:
> Question #681661 on CalcHEP changed:
> https://answers.launchpad.net/calchep/+question/681661
>
> Status: Answered => Open
>
> Marco Merchand is still having a problem:
> I tried using both T("~X","~X") and T("p*") and they work.
>
> but they still don't give me the right answer. I'm off by about 2 orders
> of magnitude.
>

A cut on the minimal value on the missing transverse momentum was applied

                  | min | max
T(~X,~X)| 100 |

also used I am supposed to used NNPDF23LO (as_0119_qed) but that is not included in the GUI so i am using
NNPDF23_lo_as_0130_qed(proton)

but i don't think this would lead to a 2 order of magnitude difference?

I can look at your model and process if you send me details to
<email address hidden>.

How you know correct answer?

Best

   Alexander Pukhov

On 01.07.2019 19:42, Marco Merchand wrote:
> Question #681661 on CalcHEP changed:
> https://answers.launchpad.net/calchep/+question/681661
>
> Status: Answered => Open
>
> Marco Merchand is still having a problem:
> A cut on the minimal value on the missing transverse momentum was
> applied
>
> | min | max
> T(~X,~X)| 100 |
>
> also used I am supposed to used NNPDF23LO (as_0119_qed) but that is not included in the GUI so i am using
> NNPDF23_lo_as_0130_qed(proton)
>
> but i don't think this would lead to a 2 order of magnitude difference?
>