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2017:groups:tools:susylha [2017/06/22 16:45]
stefan.liebler
2017:groups:tools:susylha [2017/06/22 22:22] (current)
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.
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 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>​
 +
 +
 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.  
-    * 1NLO cross section +    * 0=LO,  
-    * 2NLO+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.
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   * **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 COMMENT ​string representing the name of the program which has computed the cross section 
- +  * VERSION: ​as COMMENT ​string, the version number of the proram employed 
-Olivier Questions+  * REFERENCECitation ​ 
-  ​- 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 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 scale uncertainty in the same runCan this be added?+
2017/groups/tools/susylha.1498142712.txt.gz · Last modified: 2017/06/22 16:45 by stefan.liebler