CERN PH and Institute for Theoretical Physics, Dresden...

Sherpa vs. DØ in Z + jets[HERA and the LHC workshop]

----------------------------------------------Jan Winter a

-------------CERN PH and

Institute for Theoretical Physics, Dresden University of Technology

Our aim for this workshop series: proving that the SHERPA MC is ready forLHC studies.

validating the SHERPA (CKKW) approach against Tevatron data

validating it against other ME PS merging approaches

verifying that it gives reliable results in new (so far untested) channels

making predictions : extrapolation to LHC energies

MI model of SHERPA has been shown to work well (HERA/LHC proceedings)

Sorry...!!! SHERPA is still not a MC event generator for DIS scenarios.

a SHERPA authors: T. Gleisberg, S. Hoche, F. Krauss, A. Schalicke, S. Schumann, J. W.Jan Winter HERA/LHC workshop at CERN, Geneva, June 7, 2006 – p.1

Sherpa vs. DØ in Z + jets

Challenge: future (and present) hadron collider experiments.

LHC: first re-discover SM physics

LHC: these signals will be tomorrow’s backgrounds

LHC: tremendously large phase space for QCD radiation

LHC: is a QCD machine Multijets

LHC physics: need to understand SM backgrounds

Model...!!! Jet production Jet evolution Hadronization

SHERPA: AMEGIC++’s MEs CKKW APACIC++ Shower

SHERPA: PYTHIA (phenomenological) Models

Jan Winter HERA/LHC workshop at CERN, Geneva, June 7, 2006 – p.2

Sherpa vs. DØ in Z + jets

Scope of this talk

Central part: DØ analysis and its preliminary resultsBrief description of the analysisSHERPA version used in the analysisThe results

A brief comment: detailed merging comparison has started1st results in proceedings hep-ph/0601012,13Go for a second round.

Status of SHERPA.


The Z/γ∗+jet-production DØ analysisNames related with this analysis:

Henrik Nilsenunder supervision of Prof. Karl Jacobs, DØ group Freiburg.

Scope:Study accuracy of modelling associated jet production in Z/γ∗ eventsMCs: PYTHIA and SHERPAData: Fermilab Tevatron Run II, Oct 2002 - Nov 2005, int lum 950 pb−1

Some details:

e−, e+ with pT > 25 GeV, |η| < 2.5, one central ` with |η| < 1.1

variety of single and di-electron triggers, optimized likelihood function to separatereal electrons from QCD jet production BG

70 GeV ≤ m2(e−, e+) ≤ 100 GeV

jets according to DØ Run II cone algorithm, pT > 15 GeV, ∆R`j > 0.5

some more work to suppress fake jets and to avoid electron contamination

Gaussian smearing of jet energies in MC events

+ data zero bias events overlayed to account for other pp in same beam crossingJan Winter HERA/LHC workshop at CERN, Geneva, June 7, 2006 – p.4

The Z/γ∗+jet-production DØ analysisPYTHIA:

version 6.319 using CTEQ6L1 PDF

tuned to match a ME prediction for Z/γ∗ + 1 jet production

UE model: TUNE A parameter set

SHERPA:

version 1.0.6 with CTEQ6L PDF

inclusive Z/γ∗ + 3 jet sample, i.e. ME’s up to 3 jets included

internal separation cut kT,0 = 20 GeV

UE model: default (set up according to data used for R. Field’s TUNE A)

Processing:

• full DØ detector simulation and reconstruction chain

• normalization is to total number of Z/γ∗ events found in data sample

• systematic uncertainties: main contributions arise from jet energy scale andsmearing of jet energies


SHERPA in the Z+jet-production DØ analysisT. Gleisberg, S. Höche, F. Krauss, A. Schälicke, S. Schumann and J. W., JHEP 0402 056 (2004).

SHERPA version 1.0.6 has been used:

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SHERPA in the Z+jet-production DØ analysisBrief note: CKKW is implemented within SHERPA in full generality.

S. Catani, F. Krauss, R. Kuhn and B. Webber, JHEP 0111 063 (2001)F. Krauss, JHEP 0208 015 (2002)

Strategy:

Divide multijet phase space into two regimes.apply cut Qsep on MEs to regularize divergencies.implies large, unphysical Qsep dependence for fixed multiplicity.jet production through the tree level MEs.jet evolution down to fragmentation scale through the PS.

Reweight MEs by a combined coupling and Sudakov weight to get exclusivesamples at given resolution scale Qsep.

Veto on PS configurations that are already included through higher order ME.

Reweighting and vetoing eliminate/sizeably reduce the Qsep dependence.


SHERPA in the Z+jet-production DØ analysisBrief note: CKKW is implemented within SHERPA in full generality.

S. Catani, F. Krauss, R. Kuhn and B. Webber, JHEP 0111 063 (2001)F. Krauss, JHEP 0208 015 (2002)

Visualization:

Q1

Q Q1 Q

a) b)

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Q2

Q1 Q

Q2

Q

Q1

a) b)

c)

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∆g(Qjet,Q2)

Q1

Q2

W=∆g(Qjet,Q2)[∆q(Qjet,Q1)]2αs(Q2)

αs(Qjet)


SHERPA in the Z+jet-production DØ analysisBrief note: SHERPA uses MI model mainly based on Sjöstrand/Zijl ansatz.

1st results have been presented in the “HERA and the LHC” proceedings:hep-ph/0601012,13

AMISIC++ has been set up to also work with the CKKW merging of SHERPA.

HPs with FS multiplicities different from two require unique definition of the MIstart scale.

Employ kT jet clustering algorithm to identify the last QCD node of the HP thatneeds to be clustered.

Its p2⊥ defines the start scale for the MI evolution, and also the veto scale

for the subsequent PS,

since PSs are attachedto the secondary interactionsinitiated atthe QCD scaleµ2

QCD = 2stu/(s2 + t2 + u2).


Preliminary DØ results in Z+jet-productionThe DØ collaboration, DØ note 5066-CONF

The transverse momentum of the e+e− system.

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Data vs. PYTHIA Data vs. SHERPA

Shaded ranges: MC statistics, central value ±1σ.

Di-electron system has to balance the pT of the jet system.



Jet multiplicity, data vs. PYTHIA (left) and SHERPA (right).

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MC predictions are normalized to total number of events observed in data.

large systematic uncertainties arise from low pT jets⇒ both predictions are inagreement with data.



Jet spectra: 1st jet, data vs. PYTHIA (left) and SHERPA (right).

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PYTHIA: clear, positive slope in the ratio; lack of hard jets

SHERPA: for most bins, prediction consistent with data if syst. errors included

SHERPA: predictions are too hard around 80 GeVJan Winter HERA/LHC workshop at CERN, Geneva, June 7, 2006 – p.12


Jet spectra: 2nd jet, data vs. PYTHIA (left) and SHERPA (right).

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PYTHIA: slope in the ratio gets increased.

SHERPA: as before, nearly consistent with data, the 80 GeV problem!



Jet spectra: 3rd jet, data vs. PYTHIA (left) and SHERPA (right).

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With the same pattern as before.



Eta difference between the two hardest jets in incl Z/γ∗ + 2 jets.

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Studying angular correlations; these should fall into the domain of ME.

Both predictions are consistent with the data.



Phi difference between the two hardest jets in incl Z/γ∗ + 2 jets.

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Overall normalization is still in agreement with data within the errors.

SHERPA predicts shape that allows for consistency with straight line at 1.

PYTHIA has problems in the lowest and highest (their UE model?) ∆φ bins.Jan Winter HERA/LHC workshop at CERN, Geneva, June 7, 2006 – p.16


Transverse momentum of the third jet under the central-jet condition.

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Central-jet studies according to Zeppenfeld ideas:|η1 − η2| > 2.0 and η1,2 < η3 < η2,1.



Eta of third jet using the Zeppenfeld definition.

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Number of events passing tagging criteria might be toolow, for PYTHIA even worse.

η∗ = η3 −η1 + η2

2



Conclusions from our point of view:

First of all, many thanks go to ...

SHERPA has been passed through a full detector simulation and it worked.

Our implemented MI model reasonably/smoothly fits into the CKKW machinery ofSHERPA.

For characteristics,multijets⇒ jet multiplicities and spectra,angular correlations,

we have been expected to describe them well, we succeeded.

Global normalization seems to be sufficient.


Merging approach comparison between ...the MLM, LL and SHERPA ME-PS-merging has started: hep-ph/0602031.ET jet spectra atTevatron Run II

ET jet spectra at Run IIAlpgen µR × 0.5

ET jet spectra atthe LHCη jet spectra atTevatron Run IIη jet spectra atthe LHCpT (W ) and ∆η spectra atTevatron Run IIpT (W ) and ∆η spectra atthe LHC

impact of scale variation,a 1st estimateof scale uncertainties

similar patternwrt Tevatron

broadening of jet ηsin ARIADNE

again similar patternwrt Tevatron

once tuned toTevatron data,same extrapolation toLHC can be expected

exploring differences of themerging approaches is essential to assess systematic uncertainties of multijet calculations

2nd round: more observ. (correlations, intrajet ch.), scale variat., residual param. depend.


Merging approach comparison between ...the MLM, LL and SHERPA ME-PS-merging has started: hep-ph/0602031.

ET jet spectra atTevatron Run II

ET jet spectra at Run IIAlpgen µR × 0.5

ET jet spectra atthe LHCη jet spectra atTevatron Run IIη jet spectra atthe LHCpT (W ) and ∆η spectra atTevatron Run IIpT (W ) and ∆η spectra atthe LHC










ET jet spectra atTevatron Run IIET jet spectra at Run IIAlpgen µR × 0.5

ET jet spectra atthe LHC

η jet spectra atTevatron Run IIη jet spectra atthe LHCpT (W ) and ∆η spectra atTevatron Run IIpT (W ) and ∆η spectra atthe LHC











ET jet spectra atthe LHC

η jet spectra atTevatron Run II

η jet spectra atthe LHCpT (W ) and ∆η spectra atTevatron Run IIpT (W ) and ∆η spectra atthe LHC











ET jet spectra atthe LHCη jet spectra atTevatron Run II

η jet spectra atthe LHC

pT (W ) and ∆η spectra atTevatron Run IIpT (W ) and ∆η spectra atthe LHC











ET jet spectra atthe LHCη jet spectra atTevatron Run IIη jet spectra atthe LHC

pT (W ) and ∆η spectra atTevatron Run II

pT (W ) and ∆η spectra atthe LHC











ET jet spectra atthe LHCη jet spectra atTevatron Run IIη jet spectra atthe LHCpT (W ) and ∆η spectra atTevatron Run II

pT (W ) and ∆η spectra atthe LHC







2nd round: more observ. (correlations, intrajet ch.), scale variat., residual param. depend.Jan Winter HERA/LHC workshop at CERN, Geneva, June 7, 2006 – p.20

Current SHERPA version: http://www.sherpa-mc.de/T. Gleisberg, S. Höche, F. Krauss, A. Schälicke, S. Schumann and J. W., JHEP 0402 056 (2004).

SHERPA version 1.0.8 has been released recently:

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IS/FS shower module APACIC++


Multiple interactions module AMISIC++

Interface to PYTHIA’s string hadronization(cluster-model implementation of J.W. et al., Eur.Phys.J.C36,2004 still under construction)

Interface to PYTHIA’s hadron decaysOwn hadron-decay framework and tau decay library

More new features:

revised SUSY sector (SUSY comparison: K. Hagiwara et al., Phys. Rev. D73, 055005 (2006)),including SLHA interface

decay chain treatment for heavy unstable particles in MEs

revised CKKW sector (QCD jets, VBF) simply a number of bug fixingsJan Winter HERA/LHC workshop at CERN, Geneva, June 7, 2006 – p.21

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CERN PH and Institute for Theoretical Physics, Dresden...

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