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2013:groups:sm:start [2013/06/06 12:26]
fawzi.boudjema
2013:groups:sm:start [2013/06/11 18:39] (current)
fawzi.boudjema
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 e)      prescriptions for combining QCD and EW corrections e)      prescriptions for combining QCD and EW corrections
 +
 +The Wishlist page is [[2013:​groups:​sm:​nnlowishlist|here]]
         ​         ​
-3)      ​===Binoth Les Houches Accord (BLHA)===+3)      ​**Binoth Les Houches Accord (BLHA)**
  
-a) An update on this is in the make, see [[2013:​groups:​sm:​blha|the BLHA page]]+ An update on this is in the make, see [[2013:​groups:​sm:​blha|the BLHA page]]
  
-The details are in the new version of the draft: 
  
-[[http://​phystev.in2p3.fr/​wiki/​_media/​2013:​groups:​sm:​blhaupdate2013.pdf|Pdf file]] of the updated write-up+4)      **Top Decays** 
 +a)      handling top decays in processes like tTH, tTbB and tTjj
  
-Summary of the main points agreed on in the meeting of June 5:  
  
-=== Passing Parameters:​=== 
  
-function: OLP_SetParameter(char*,​ &​double,​ &​double,​ &int) 
  
-The keywords for the particle masses and widths are defined by their PDG codes, 
-names for couplings are defined in the write-up, e.g. for the top mass, width, sin^2\theta_w:​ 
-mass(6),  ​ 
-width(6), 
-sw2 
  
-Note that these parameters can be complex (two doubles as function arguments).+**[[2013:​groups:​sm:​cutsobservables|Cuts and Observables]]**
  
-Global settings like  +==== Plans for the upcoming Les Houches Report ====
-MassiveParticles,​ +
-(In)ActiveParticles+
  
-should also be possible. +=== EW corrections - theoretical guidelines and experimental issues ​=== 
- +== Theoretical guidelines: == 
-===Treatment of unstable phase space points:=== +  ​* EW input parameter schemes \\ which to use in which process ​for which corrections, ​etc
- +  * Photon radiation \\ their role in NC/CC processesgeneral features, collinear non-safety versus KLN inclusiveness, etc. 
-no changes with respect to the last version of the draft +  * Photon-induced processes \\ their size in various processes, how to fix the photon PDFEW factorization scheme, etc. 
- +  * EW Sudakov logs \\ quality ​of a leading-log approximation for NLO EW corrections,​ real W/Z emissiontwo-loops and beyondetc
-===different powers of coupling constants:=== +  more?
- +
-allow different settings for different subprocesses +
- +
-example: ​  +
-AlphasOrder 2  (global setting) +
- +
-process x AlphasOrder 3 ; AlphaOrder 1 (use these orders ​in alpha_s, alpha only for process ​x) +
- +
-process y AlphasOrder 4 ; AlphaOrder 0 +
- +
-This setup can be used for merged samples as well as mixed QCD/​EW ​corrections+
-It can also be used to pass additional information referring only to particular subprocessese.g+
- +
-process x AlphasOrder 3 ; AlphaOrder 1 ; AmplitudeType LoopInduced +
- +
-===EW corrections:​=== +
- +
-no changes wrt the last version of the draft.  +
-Importance to keep the EW Scheme option "​UserDefined"​ was stressed. +
- +
-===Polarisation/​Colour:​=== +
- +
-Conventions for polarisation vectors already have been fixed at the last meeting. +
-For special options concerning colour  +
-(terms ​in 1/N expansionnot colour summed, etc) it was felt that this should be  +
-"​hardwired"​ between the particular OLP/MC providers ​to follow ​the individual needs. +
- +
-===Restrictions such as diagram filtersexploitation of special symmetries, etc:=== +
- +
-Also rather something where the particular OLP/MC providers (humans) should talk to each other+
- +
-  +
- +
-Test cases to try out implementation ​of the new settings: +
- +
-=== Z+1/Z+2 jets; dijet/3jets === +
- +
- +
-Test cases will be discussed on Monday June 1015h00Library+
- +
-  +
- +
- +
-b) Implementation of corrections (in particular EW) in Monte Carlo programs (e.g. Sherpa) +
- +
- +
-4)      ​**Top Decays** +
-a)      handling top decays in processes like tTH, tTbB and tTjj+
  
 +== Experimental issues: ==
 +  * ...
  
  
 ==== Coordination with Snowmass: QCD Issues ​ ====      ==== Coordination with Snowmass: QCD Issues ​ ====     
 **[[2013:​groups:​sm:​snowmass|here]]** **[[2013:​groups:​sm:​snowmass|here]]**
- 
2013/groups/sm/start.1370514388.txt.gz · Last modified: 2013/06/06 12:26 by fawzi.boudjema