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2013:groups:sm:start [2013/06/05 22:46] gudrun.heinrich |
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. | + | 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 processes, general 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 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. | |
- | ===different powers of coupling constants:=== | + | * more? |
- | + | ||
- | allow different settings for different subprocesses | + | |
- | + | ||
- | example: | + | |
- | orderQCD 2 (global setting) | + | |
- | + | ||
- | process x orderQCD 3 ; orderQED 1 (use these orders in alpha_s, alpha only for process x) | + | |
- | + | ||
- | process y orderQCD 4 ; orderQED 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 orderQCD 3 ; orderQED 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) | + | |
- | + | ||
- | + | ||
- | 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]]** | ||
- |