2013:groups:sm:start
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2013:groups:sm:start [2013/06/06 08:04] gudrun.heinrich |
2013:groups:sm:start [2013/06/09 12:33] stefan.dittmaier [Plans for the upcoming Les Houches Report] |
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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. | + | 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 | + | |
| - | + | ||
| - | 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). | + | |
| - | + | ||
| - | Global settings like | + | |
| - | MassiveParticles, | + | |
| - | (In)ActiveParticles | + | |
| - | + | ||
| - | should also be possible. | + | |
| - | + | ||
| - | ===Treatment of unstable phase space points:=== | + | |
| - | + | ||
| - | no changes with respect to the last version of the draft | + | |
| - | + | ||
| - | ===different powers of coupling constants:=== | + | |
| - | + | ||
| - | 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 subprocesses, e.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 expansion, not 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 filters, exploitation 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 10, 15h00, Library. | + | |
| - | + | ||
| - | + | ||
| - | + | ||
| - | + | ||
| - | b) Implementation of corrections (in particular EW) in Monte Carlo programs (e.g. Sherpa) | + | |
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| **[[2013:groups:sm:snowmass|here]]** | **[[2013:groups:sm:snowmass|here]]** | ||
| + | **[[2013:groups:sm:cutsobservables|Cuts and Observables]]** | ||
| + | |||
| + | ==== Plans for the upcoming Les Houches Report ==== | ||
| + | |||
| + | === EW corrections - theoretical guidelines and experimental issues === | ||
| + | == Theoretical guidelines: == | ||
| + | * EW input parameter schemes \\ which to use in which process / for which corrections, etc. | ||
| + | * Photon radiation \\ their role in NC/CC processes, general features, collinear non-safety versus KLN inclusiveness, etc. | ||
| + | * Photon-induced processes \\ their size in various processes, how to fix the photon PDF, EW factorization scheme, etc. | ||
| + | * EW Sudakov logs \\ quality of a leading-log approximation for NLO EW corrections, real W/Z emission, two-loops and beyond, etc. | ||
| + | * more? | ||
| + | |||
| + | == Experimental issues: == | ||
| + | * ... | ||
2013/groups/sm/start.txt · Last modified: 2013/06/11 18:39 by fawzi.boudjema
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