QED/EW ME/PS Matching

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Hello everybody, and welcome to the embryonic Les Houches 2009 QED/EW ME/PS Matching page!

A big 'thank you' to Peter, Fabio and Jon for having created the page.

Anyone who is not yet on the 'expressed interest' list, and who would like to be, please send me a mail: smgascon@in2p3.fr.

First discussion: Wednesday 10 June at 11h30 in the QCD room.

What happened at the first discussion:

1) Status of trials with ALPGEN interfaced with PYTHIA:

a) A 'manual' procedure has been developed by Fulvio, Mauro Moretti and implemented by Clement and Suzanne. The test process is zphjets (== Z + mgamma + njets, author Roberto P.)

The procedure eliminates double-counting between: Z + 0 gamma + 0 jets (photon provided by PYTHIA PS) and Z + 1gamma + 0 jets (photon provided by ALPGEN)

Order of magnitude of double-counting was found to be ~5%.

The 'manual' procedure is now being checked by Suzanne, Clement and J. Tao on the test processes njets and phjet (==mgamma + njets)

The procedure would eliminates double-counting between: 2jets (photon provided by PYTHIA PS) and 1gamma + 1jet + 1gamma + 2jets (photon provided by ALPGEN)

b) A trial test automated procedure has been implemented in ALPGEN by Fulvio and Mauro M and is being validated and cross-checked by Suzanne, Clement and J. Tao . The test process is phjet (== mgamma + njets)

The procedure eliminates double-counting between:

1 gamma + 1jet (exclusive) and 2gamma + 1jet (inclusive) with photons provided by ALPGEN

Fulvio has started working on porting the test automated procedure to the process njets. It will be cross-checked against the manual procedure (see a) above)

If Roberto P. has time he is willing to work on the automated procedure for Z + mgamma + njets

2) Wish list (under construction)

Following is a list of processes where QED ME/PS matching is under test and/or desired:

Z + mgamma + njets TESTED, manual procedure

njets and mgamma + njets UNDER TEST, automated procedure

W + mgamma + njets

QQbar + mgamma + njets (Q=={b,t})

3) NLO: Interest also in QED matching of partonic NLO code (such as Baur for Wgamma) to PS

4) Related efforts, possibly check for synergy / interest:

  • Jennifer Archibald, working on MCnet project on NLO EW matching for Drell-Yan in Sherpa.
  • Renat Sadykov MCnet project + SANC group (with Peter R and Peter S), interfaced NLO EW generator for Drell-Yan (SANC) to Herwig and Pythia parton showers, including corrections with incoming photons.

5) Related papers:

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