Tools and Monte Carlo Session 1 (SM)

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(Standard Processes for Early LHC Data (Joint with NLO/Multileg))
Current revision (08:59, 26 November 2009) (view source)
(Data Correction and Unfolding)
 
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A rivet tutorial (Andy Buckley) was given 16:00 Thursday in the QCD room.
A rivet tutorial (Andy Buckley) was given 16:00 Thursday in the QCD room.
 +
 +
Proceedings expected. Joint with Professor. Joint with Important Data Sets.
* Professor http://projects.hepforge.org/professor/
* Professor http://projects.hepforge.org/professor/
-
Professor is a MC tuning tool, developed in Python as a set of command line programs and an underlying library. The Rivet toolkit is used to generate MC data and retrieve experimental reference data.
+
Professor is a MC tuning tool, developed in Python as a set of command line programs and an underlying library. The Rivet toolkit is used to generate MC data and retrieve experimental reference data.
 +
 
 +
Proceedings joint with Rivet.
== [[Systematic Evaluation of Errors on tunes]] ==
== [[Systematic Evaluation of Errors on tunes]] ==
-
The title is a link.
+
The title is a link.  
 +
 
 +
Proceedings: check with interested parties. (Professor group will prepare something)
== [[Important data sets for tuning]] ==
== [[Important data sets for tuning]] ==
Follow the link above.
Follow the link above.
 +
 +
Proceedings joint with Rivet.
== Multiple Parton Interactions ==
== Multiple Parton Interactions ==
* [[W+jets from MPI]] (E. Maina, R. Chierici, S. Plaetzer, P. Skands, K. Mazumdar, S.Gieseke)
* [[W+jets from MPI]] (E. Maina, R. Chierici, S. Plaetzer, P. Skands, K. Mazumdar, S.Gieseke)
 +
* ttbar+jets from MPI (see ttbar+jets study; P. Bartalini et al.)
 +
 +
Joint proceedings? Check with authors.
== [[Tuning in the presence of matching]] ==
== [[Tuning in the presence of matching]] ==
-
Follow the link above.
+
Follow the link above.
 +
 
 +
Proceedings: check with piergiulio, jeppe, mario.
= Model (in)dependence in Data/Theory Comparisons =
= Model (in)dependence in Data/Theory Comparisons =
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This is joint with Session 2; see also:
This is joint with Session 2; see also:
[[Tools_and_Monte_Carlo_Session_2_(BSM)#Detector_simulation_.28with_Session_1.29]]
[[Tools_and_Monte_Carlo_Session_2_(BSM)#Detector_simulation_.28with_Session_1.29]]
 +
 +
Proceedings expected. Jon responsible.
== [[Data Correction and Unfolding]] ==
== [[Data Correction and Unfolding]] ==
 +
 +
Contribution from G. Hesketh, in seection with fast sim.
= Matching =
= Matching =
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* Overview of systematic studies so far (Z/W+jets, ttbar, Z->qqbar)
* Overview of systematic studies so far (Z/W+jets, ttbar, Z->qqbar)
* Why it's not a complete set  
* Why it's not a complete set  
-
** gg initial states (Higgs, with NLM Higgs)
+
** [[gg initial states (Higgs, with NLM Higgs)]]
** [[Wbb in the high pT HW region]] (and Zbb)
** [[Wbb in the high pT HW region]] (and Zbb)
** distinguish between W+ and W- at LHC
** distinguish between W+ and W- at LHC
-
** QCD n-jets (P. Francavilla)
+
** QCD n-jets (P. Francavilla, S. Hoeche)
** New Physics Benchmarks?
** New Physics Benchmarks?
* Comparison of NLO (e.g., MCFM, MC@NLO, POWHEG) with tree-level calculations (e.g., Madgraph, Alpgen, with and without showers) (e.g., for Higgs) (J. Winter, P. Lenzi)
* Comparison of NLO (e.g., MCFM, MC@NLO, POWHEG) with tree-level calculations (e.g., Madgraph, Alpgen, with and without showers) (e.g., for Higgs) (J. Winter, P. Lenzi)
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* Complete set of observables? (not only pT and rapidity, but jet-jet correlations, jet masses, jet-jet Delta(R), etc)
* Complete set of observables? (not only pT and rapidity, but jet-jet correlations, jet masses, jet-jet Delta(R), etc)
* Sensitivity to tuning (with Tuning subgroup, see [[Tuning in the presence of matching]])
* Sensitivity to tuning (with Tuning subgroup, see [[Tuning in the presence of matching]])
 +
 +
Proceedings expected on Wbb (Jon, Giacinto, Laura). Proceedings expected on ttbar + jets study (Peter to check with Frank-Peter. 8/11 mailed, awaiting reply.). Peter and Fabio to check with remaining groups.
== [[QED/EW ME/PS Matching]] ==
== [[QED/EW ME/PS Matching]] ==
-
* So far declared interest: S. Gascon, F. Piccinini, C. Baty, S. Ferrag, K. Mazumdar...
+
* So far declared interest: S. Gascon, F. Piccinini, C. Baty, S. Ferrag, K. Mazumdar, R. Pittau (tbc!)...
 +
 
 +
Proceedings: Peter to check with authors. 8/11 mailed Gascon and Mazumdar, awaiting replies.
== [[LHEF for Matching]] ==
== [[LHEF for Matching]] ==
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* Possible to agree on Standard for describing, in Les Houches Event Files, properties and cuts used in ME generation that subsequent matching steps based on jet clustering would need to know about?
* Possible to agree on Standard for describing, in Les Houches Event Files, properties and cuts used in ME generation that subsequent matching steps based on jet clustering would need to know about?
* Possibly including NLO
* Possibly including NLO
 +
 +
Proceedings expected. Peter to check with Leif. 8/11 wrote mail to Leif, awaiting reply. Leif expecting contribution slightly larger than 10p.
== [[Automated ME/PS merging]] ==
== [[Automated ME/PS merging]] ==
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* Automating 1st-order correction factors for showers from automatic evaluation of |M(X+1)|^2/|M(X)|^2 from an ME generator.
* Automating 1st-order correction factors for showers from automatic evaluation of |M(X+1)|^2/|M(X)|^2 from an ME generator.
* Automated merging for BSM (with session 2)
* Automated merging for BSM (with session 2)
 +
 +
Peter to check with Plaetzer. 8/11 mailed plaetzer, awaiting reply. Plaetzer expecting O(6p) contribution.
== Discussion on MC Uncertainties (with EX/TH and tuning subgroups) ==
== Discussion on MC Uncertainties (with EX/TH and tuning subgroups) ==
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* Uncertainty bands for Monte Carlos: see [[Systematic Evaluation of Errors on tunes]]
* Uncertainty bands for Monte Carlos: see [[Systematic Evaluation of Errors on tunes]]
* So far declared interest: S. Mrenna, R. Chierici, F. Maltoni, P. Skands
* So far declared interest: S. Mrenna, R. Chierici, F. Maltoni, P. Skands
 +
 +
No proceedings expected
== [[NLO/PS Matching]] ==
== [[NLO/PS Matching]] ==
-
Joint with multileg group.
+
Joint with multileg group.  
-
== [[Parton Showers as Phase Space Generators]] ==
+
Proceedings for Wbb, see benchmarks. Peter to check with remaining authors. 8/11 mailed out, awaiting replies.
-
* Sector Showers (Kosower, Skands)
+
 
 +
== [[Sector Showers]] ==
 +
 
 +
Proceedings expected. Peter responsible.
== [[Ttbar plus jets study]] ==
== [[Ttbar plus jets study]] ==
 +
 +
Proceedings expected, joint with benchmarks, see above.
== [[Matching Beyond Fixed Orders]] ==
== [[Matching Beyond Fixed Orders]] ==
 +
 +
Proceedings expected, see Radiation Between Jets.
== [[Wbb in the high pT HW region]] ==
== [[Wbb in the high pT HW region]] ==
 +
 +
Proceedings expected, follow title link.
= Parton Densities =
= Parton Densities =
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* BSM effects in PDFs (with Session 2)
* BSM effects in PDFs (with Session 2)
 +
 +
Proceedings: Jon to check with Liza Mojovic on LO*.
== Heavy quark PDF's ==
== Heavy quark PDF's ==
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[http://xxx.soton.ac.uk/abs/0906.1833 A very recent pedagogical review] of jets, new algorithms and substructure.
[http://xxx.soton.ac.uk/abs/0906.1833 A very recent pedagogical review] of jets, new algorithms and substructure.
 +
 +
No proceedings expected.
== [[Jet Substructure]] ==
== [[Jet Substructure]] ==
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Boosted hadronic decays of massive particles (W,Z,Top,H,BSM..., with session 2) and jet mass/shape studies  
Boosted hadronic decays of massive particles (W,Z,Top,H,BSM..., with session 2) and jet mass/shape studies  
with QCD jets in early data.
with QCD jets in early data.
 +
 +
Several Proceedings expected. Jon to check with authors.
== [[Study of radiation between jets, for colour singlet and colour octet exchange]] ==
== [[Study of radiation between jets, for colour singlet and colour octet exchange]] ==
 +
 +
Proceedings Expected. Peter to hound Jeppe and Mario. 8/11 mailed Mario and Jeppe, awaiting reply.
= Standard Processes for Early LHC Data (Joint with NLO/Multileg) =
= Standard Processes for Early LHC Data (Joint with NLO/Multileg) =
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In the introduction session, the proposal was made that some standard processes should be listed, and in additona a subset of these should followed through the various MC and NLM sessions, to review the impact of the various issues ((N)NLO, Matching, PDFs, jet definition, EW corrections...) on the process. This is probably a cross-group activity which should be migrated to a separate page but is here for now as a reminder.
In the introduction session, the proposal was made that some standard processes should be listed, and in additona a subset of these should followed through the various MC and NLM sessions, to review the impact of the various issues ((N)NLO, Matching, PDFs, jet definition, EW corrections...) on the process. This is probably a cross-group activity which should be migrated to a separate page but is here for now as a reminder.
-
List based on my poor memory, to be amended...
+
== Drell-Yan ==
 +
 
 +
(Samir Ferrag, Stefano Moretti, Carlo Carlani... (in session 2))
 +
 
 +
Proceedings? Jon to check with Samir etc.
 +
 
 +
== ttbar ==
-
* Drell-Yan (Samir Ferrag, Stefano Moretti, Carlo Carlani... (in session 2))
+
(Kajari Mazumdar...)
 +
Proceedings: Jon to check with Kajari.
-
* ttbar (Kajari Mazumdar...)
+
== tt/(Z,Z+j) ratios ==
 +
(Bruce Mellado...)
-
* W/Z ratios etc (Bruce Mellado...)
+
Preliminary results are available [http://www-wisconsin.cern.ch/~bmellado/ttz_LesHouches.pdf here]
-
Active - material from Bruce here.
+
Proceedings: Jon to check with Bruce.

Current revision

Conveners present: Peter Skands, Fabio Maltoni, Jon Butterworth
(Click here for Tools and Monte Carlo Session 2 (BSM))

Contents

Tuning

Automated Tuning: Rivet & Professor

Toolkit for validation of Monte Carlo event generators. Using an computationally efficient model for observable computations, Rivet provides a set of experimental analyses useful for generator sanity checks, as well as a convenient infrastructure for adding your own analyses. Rivet's design emphasises the separation between HepMC records and where they came from, allowing it to be a completely cross-generator validation platform. Rivet 1.1.3 was just released (9 June).

A rivet tutorial (Andy Buckley) was given 16:00 Thursday in the QCD room.

Proceedings expected. Joint with Professor. Joint with Important Data Sets.

Professor is a MC tuning tool, developed in Python as a set of command line programs and an underlying library. The Rivet toolkit is used to generate MC data and retrieve experimental reference data.

Proceedings joint with Rivet.

Systematic Evaluation of Errors on tunes

The title is a link.

Proceedings: check with interested parties. (Professor group will prepare something)

Important data sets for tuning

Follow the link above.

Proceedings joint with Rivet.

Multiple Parton Interactions

  • W+jets from MPI (E. Maina, R. Chierici, S. Plaetzer, P. Skands, K. Mazumdar, S.Gieseke)
  • ttbar+jets from MPI (see ttbar+jets study; P. Bartalini et al.)

Joint proceedings? Check with authors.

Tuning in the presence of matching

Follow the link above.

Proceedings: check with piergiulio, jeppe, mario.

Model (in)dependence in Data/Theory Comparisons

Fast Detector Simulation Specification and Usage

This is joint with Session 2; see also: Tools_and_Monte_Carlo_Session_2_(BSM)#Detector_simulation_.28with_Session_1.29

Proceedings expected. Jon responsible.

Data Correction and Unfolding

Contribution from G. Hesketh, in seection with fast sim.

Matching

A Collection of Matching Benchmarks

  • So far declared interest: F. Maltoni, P. Skands, S. Hoeche, K. Hamilton, S. Plaetzer, S. Mrenna, L. Lonnblad, P. Francavilla, J. Winter, M. Schwarz, P. Lenzi, J. Huston, J. Andersen
  • Overview of systematic studies so far (Z/W+jets, ttbar, Z->qqbar)
  • Why it's not a complete set
  • Comparison of NLO (e.g., MCFM, MC@NLO, POWHEG) with tree-level calculations (e.g., Madgraph, Alpgen, with and without showers) (e.g., for Higgs) (J. Winter, P. Lenzi)
  • Pathological Observables / Theory Tests : (P. Skands, S. Weinzierl, S. Plaetzer, K. Hamilton, M. Schwarz, ...)
    • To test Higher-Order/Higher-Log properties of matching
    • To test Coherence/Subleadling-Logs dependence on Shower Model (new PS models)
  • Complete set of observables? (not only pT and rapidity, but jet-jet correlations, jet masses, jet-jet Delta(R), etc)
  • Sensitivity to tuning (with Tuning subgroup, see Tuning in the presence of matching)

Proceedings expected on Wbb (Jon, Giacinto, Laura). Proceedings expected on ttbar + jets study (Peter to check with Frank-Peter. 8/11 mailed, awaiting reply.). Peter and Fabio to check with remaining groups.

QED/EW ME/PS Matching

  • So far declared interest: S. Gascon, F. Piccinini, C. Baty, S. Ferrag, K. Mazumdar, R. Pittau (tbc!)...

Proceedings: Peter to check with authors. 8/11 mailed Gascon and Mazumdar, awaiting replies.

LHEF for Matching

  • So far declared interest: L. Lonnblad, T. Sjostrand, F. Maltoni, S. Platzer, S. Hoeche, K. Hamilton, A. Buckley, J. Huston...
  • Possible to agree on Standard for describing, in Les Houches Event Files, properties and cuts used in ME generation that subsequent matching steps based on jet clustering would need to know about?
  • Possibly including NLO

Proceedings expected. Peter to check with Leif. 8/11 wrote mail to Leif, awaiting reply. Leif expecting contribution slightly larger than 10p.

Automated ME/PS merging

  • So far declared interest: S. Mrenna, P. Skands, S. Hoeche, K. Hamilton, S. Plaetzer
  • Automating 1st-order correction factors for showers from automatic evaluation of |M(X+1)|^2/|M(X)|^2 from an ME generator.
  • Automated merging for BSM (with session 2)

Peter to check with Plaetzer. 8/11 mailed plaetzer, awaiting reply. Plaetzer expecting O(6p) contribution.

Discussion on MC Uncertainties (with EX/TH and tuning subgroups)

No proceedings expected

NLO/PS Matching

Joint with multileg group.

Proceedings for Wbb, see benchmarks. Peter to check with remaining authors. 8/11 mailed out, awaiting replies.

Sector Showers

Proceedings expected. Peter responsible.

Ttbar plus jets study

Proceedings expected, joint with benchmarks, see above.

Matching Beyond Fixed Orders

Proceedings expected, see Radiation Between Jets.

Wbb in the high pT HW region

Proceedings expected, follow title link.

Parton Densities

PDFs in Monte Carlos

  • Exploring the LO* PDFs, are we ready to use them for production?
  • Uncertainty Bands for the LO* PDFs
  • PDFs and their interaction with MC tuning
  • Pythia 8 - Advantages/disadvantages of using one PDF for hard scattering ME (best cross section?) and another for evolution (universal tuning?)

Beyond LO*

  • Are PDFs ready for NLO/Multileg WG?
  • Electroweak and QCD in PDFs
  • BSM effects in PDFs (with Session 2)

Proceedings: Jon to check with Liza Mojovic on LO*.

Heavy quark PDF's

  • HQ initiated processes vis-a-vis latest implementation of HQ PDF's(Session 1)

Jet Physics

For discussion of calibration and truth level, see the session on Data/Theory comparison Tools_and_Monte_Carlo_Session_1_(SM)#Data_Correction_and_Unfolding

A very recent pedagogical review of jets, new algorithms and substructure.

No proceedings expected.

Jet Substructure

Boosted hadronic decays of massive particles (W,Z,Top,H,BSM..., with session 2) and jet mass/shape studies with QCD jets in early data.

Several Proceedings expected. Jon to check with authors.

Study of radiation between jets, for colour singlet and colour octet exchange

Proceedings Expected. Peter to hound Jeppe and Mario. 8/11 mailed Mario and Jeppe, awaiting reply.

Standard Processes for Early LHC Data (Joint with NLO/Multileg)

In the introduction session, the proposal was made that some standard processes should be listed, and in additona a subset of these should followed through the various MC and NLM sessions, to review the impact of the various issues ((N)NLO, Matching, PDFs, jet definition, EW corrections...) on the process. This is probably a cross-group activity which should be migrated to a separate page but is here for now as a reminder.

Drell-Yan

(Samir Ferrag, Stefano Moretti, Carlo Carlani... (in session 2))

Proceedings? Jon to check with Samir etc.

ttbar

(Kajari Mazumdar...)

Proceedings: Jon to check with Kajari.

tt/(Z,Z+j) ratios

(Bruce Mellado...)

Preliminary results are available here

Proceedings: Jon to check with Bruce.

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