Les Houches
2023 Session
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- Use of wiki pages and slack. Wifi access/set-up.
- Important info about bus, lodging, facilities.
- Bulletins.
Wikis of Previous sessions
Les Houches Themes
(Lyrics and Music)
(Lyrics and Music)
This is an old revision of the document!
1) PDFs
a) impact of LHC data, current and future
b) impact of/need for an LHeC
c) combination of PDF sets
d) impact of NNLO jet calculations
2) (N)NLO QCD + (N)NLO EWK
a) wishlist of calculations→ review of what current exists→input: what do the experiments really want?
b) study of the 'Sudakov Zone', ~1 TeV where EWK corrections may be comparable to QCD corrections
c) PDFs with QED corrections, photon PDFs, gamma-gamma processes
d) press ahead with the tuned comparison of precision calculations for Drell-Yan processes carried out in the framework of the LPCC EW Group
e) prescriptions for combining QCD and EW corrections
3)
a) An update on this is in the make.
The details are in the new version of the draft:
Pdf file of the updated write-up
Summary of the main points agreed on in the meeting of June 5:
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.
no changes with respect to the last version of the draft
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
no changes wrt the last version of the draft. Importance to keep the EW Scheme option “UserDefined” was stressed.
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.
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:
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