2017:groups:tools:susylha
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2017:groups:tools:susylha [2017/06/22 16:45] stefan.liebler |
2017:groups:tools:susylha [2017/06/22 22:21] fabio.maltoni |
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| ====== Extension to the SLHA for cross sections ====== | ====== Extension to the SLHA for cross sections ====== | ||
| - | Interested people: Olivier Mattelaer, Sezen, Benjamin, Stefan ... ADD YOUR NAME | + | Interested people: Olivier Mattelaer, Sezen Sekmen, Benjamin Fuks, Stefan Liebler, Michael Spira, Fabio Maltoni... ADD YOUR NAME |
| Work started in LH 2013. Already quite complete. Needs to be polished and written up. Need to get agreement for the SUSY code developers. | Work started in LH 2013. Already quite complete. Needs to be polished and written up. Need to get agreement for the SUSY code developers. | ||
| Line 21: | Line 21: | ||
| This general information line is then followed by the cross section themselves, given as a series of line under the form | This general information line is then followed by the cross section themselves, given as a series of line under the form | ||
| <code> | <code> | ||
| - | SCALE_SCHEME QCD_ORDER EW_ORDER KAPPA_F KAPPA_R PDF_ID VALUE CODE VERSION | + | SCALE_SCHEME QCD_ORDER EW_ORDER KAPPA_F KAPPA_R PDF_ID1 PDF_ID2 VALUE VALUEUP VALUEDOWN DUMMY |
| </code> | </code> | ||
| + | |||
| + | <code> | ||
| + | SCALE_SCHEME QCD EW K_F K_R PDF_ID1 PDF_ID2 VAL VALUP VALDOWN DUMMY | ||
| + | </code> | ||
| + | |||
| where | where | ||
| * **SCALE_SCHEME**: an integer number, related to the way the central scales are chosen. So far, the choices are | * **SCALE_SCHEME**: an integer number, related to the way the central scales are chosen. So far, the choices are | ||
| * 0: the central scale is the average mass of the produced particles | * 0: the central scale is the average mass of the produced particles | ||
| * 1: fixed scales | * 1: fixed scales | ||
| - | * 2: the scale is set to the partonic center-of-mass energy | + | * 2: the scale is set to the invariant mass of the final state particles at the LO |
| - | * 3: the scale is set to the transverse mass of the final state particles | + | * 3: the scale is set to the transverse mass of the final state particles at the LO |
| - | * **QCD_ORDER**: an integer number, which contains information on the order in alpha_s included in the computation. This is codified as | + | * 4: some other definition to be described as a comment |
| - | * 0: Born cross section | + | * **QCD_ORDER**: an integer number, which contains information on the order in alpha_s included in the computation. In order to deal with resummation I suggest to add a second digit to QCD_ORDER, i.e. |
| - | * 1: NLO cross section | + | * 0=LO, |
| - | * 2: NLO+NLL cross section | + | * 1=NLO, |
| + | * 2=NNLO, | ||
| + | * 3=N3LO, | ||
| + | * 11=NLO+NLL, | ||
| + | * 21=NNLO+NLL, | ||
| + | * 22=NNLO+NNLL, | ||
| + | * TYPE of resummation as a COMMENT. | ||
| * **EW_ORDER**: same as above but with respect to electroweak corrections | * **EW_ORDER**: same as above but with respect to electroweak corrections | ||
| * ** KAPPA_F**: a floating point number, related to the variation of the factorization scale with respect to the central scale. For SCALE_SCHEME set to 1, the scale itself has to be provided. | * ** KAPPA_F**: a floating point number, related to the variation of the factorization scale with respect to the central scale. For SCALE_SCHEME set to 1, the scale itself has to be provided. | ||
| Line 38: | Line 49: | ||
| * **PDF_ID**: the lhapdf code of the employed parton densities | * **PDF_ID**: the lhapdf code of the employed parton densities | ||
| * **VALUE**: a floating point number, representing the value of the cross section in pb. | * **VALUE**: a floating point number, representing the value of the cross section in pb. | ||
| - | * **CODE**: a string representing the name of the program which has computed the cross section | + | * **DUMMY**: integer number to tag possible different options to be described in the comments |
| - | * **VERSION**: a string, the version number of the proram employed | + | * CODE: as a COMMENT string representing the name of the program which has computed the cross section |
| - | + | * VERSION: as a COMMENT string, the version number of the proram employed | |
| - | Olivier Questions: | + | * REFERENCE: Citation |
| - | - Do we really want to have 1 line for each PDF replica? Would not be better to quote the theoretical uncertainty in % ? | + | * FIX the meaning of DEFAULT values... |
| - | - What about non LHC collision (fix target/ DIS/...)? This requires 2 PDF id. | + | |
| - | - other scheme are often used like HT/2 and (CKKW ones) are not even analytic. | + | |
| - | - What about NNLO or NNLL? | + | |
| - | - using some xml tag in a non xml like file is weird (or I do not understand where you plan to write such information). | + | |
| - | - Missing the information of the statistical uncertainty | + | |
| Stefan comments: | Stefan comments: | ||
| - | - In order to deal with resummation I suggest to add a second digit to QCD_ORDER, i.e. 0=LO, 1=NLO, 2=NNLO, etc. 11=NLO+NLL, 21=NNLO+NLL, 22=NNLO+NNLL, etc. However this approach is not specific to what is actually resummed (p_T, threshold,...). | + | - OPTIONAL: For EW corrections it would be helpful to somehow encode if full factorization is assumed or not. => Implement as a comment what scheme is used to combine QCD and EW corrections. |
| - | - For EW corrections it would be helpful to somehow encode if full factorization is assumed or not. | + | |
| - | - Some codes also give a scale uncertainty in the same run. Can this be added? | + | |
2017/groups/tools/susylha.txt · Last modified: 2017/06/22 22:22 by fabio.maltoni
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