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TRANSCRIPT
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.
Jan Winter HERA/LHC workshop at CERN, Geneva, June 7, 2006 – p.3
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
Jan Winter HERA/LHC workshop at CERN, Geneva, June 7, 2006 – p.5
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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IS and FS shower module APACIC++(virtuality ordered, PYTHIA-like showers)
Combination of ME and PSaccording to CKKW
Simulation of multiple parton interactionsmain ideas based on T. Sjöstrand and M. van Zijl, Phys. Rev. D36 (1987)
Interface to PYTHIA’s string hadronization
Interface to PYTHIA’s hadron decays
Sherpa is the event generation framework:
- initialization of the different phases - interplay of the various stages -- steering the event generation -
Jan Winter HERA/LHC workshop at CERN, Geneva, June 7, 2006 – p.6
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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IS and FS shower module APACIC++(virtuality ordered, PYTHIA-like showers)
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Simulation of multiple parton interactionsmain ideas based on T. Sjöstrand and M. van Zijl, Phys. Rev. D36 (1987)
Interface to PYTHIA’s string hadronization
Interface to PYTHIA’s hadron decays
Sherpa is the event generation framework:
- initialization of the different phases - interplay of the various stages -- steering the event generation -
Jan Winter HERA/LHC workshop at CERN, Geneva, June 7, 2006 – p.6
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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ME generator AMEGIC++(at tree level, provides HP and HD in SM, MSSM, ADD)
IS and FS shower module APACIC++(virtuality ordered, PYTHIA-like showers)
Combination of ME and PSaccording to CKKW
Simulation of multiple parton interactionsmain ideas based on T. Sjöstrand and M. van Zijl, Phys. Rev. D36 (1987)
Interface to PYTHIA’s string hadronization
Interface to PYTHIA’s hadron decays
Sherpa is the event generation framework:
- initialization of the different phases - interplay of the various stages -- steering the event generation -
Jan Winter HERA/LHC workshop at CERN, Geneva, June 7, 2006 – p.6
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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T T T T T TT T T T T TT T T T T T
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ME generator AMEGIC++(at tree level, provides HP and HD in SM, MSSM, ADD)
IS and FS shower module APACIC++(virtuality ordered, PYTHIA-like showers)
Combination of ME and PSaccording to CKKW
Simulation of multiple parton interactionsmain ideas based on T. Sjöstrand and M. van Zijl, Phys. Rev. D36 (1987)
Interface to PYTHIA’s string hadronization
Interface to PYTHIA’s hadron decays
Sherpa is the event generation framework:
- initialization of the different phases - interplay of the various stages -- steering the event generation -
Jan Winter HERA/LHC workshop at CERN, Geneva, June 7, 2006 – p.6
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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ME generator AMEGIC++(at tree level, provides HP and HD in SM, MSSM, ADD)
IS and FS shower module APACIC++(virtuality ordered, PYTHIA-like showers)
Combination of ME and PSaccording to CKKW
Simulation of multiple parton interactionsmain ideas based on T. Sjöstrand and M. van Zijl, Phys. Rev. D36 (1987)
Interface to PYTHIA’s string hadronization
Interface to PYTHIA’s hadron decays
Sherpa is the event generation framework:
- initialization of the different phases - interplay of the various stages -- steering the event generation -
Jan Winter HERA/LHC workshop at CERN, Geneva, June 7, 2006 – p.6
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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ME generator AMEGIC++(at tree level, provides HP and HD in SM, MSSM, ADD)
IS and FS shower module APACIC++(virtuality ordered, PYTHIA-like showers)
Combination of ME and PSaccording to CKKW
Simulation of multiple parton interactionsmain ideas based on T. Sjöstrand and M. van Zijl, Phys. Rev. D36 (1987)
Interface to PYTHIA’s string hadronization
Interface to PYTHIA’s hadron decays
Sherpa is the event generation framework:
- initialization of the different phases - interplay of the various stages -- steering the event generation -
Jan Winter HERA/LHC workshop at CERN, Geneva, June 7, 2006 – p.6
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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2 2 2 2 22 2 2 2 22 2 2 2 23 3 3 3 33 3 3 3 33 3 3 3 3
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K K KK K KK K KK K KK K KL L LL L LL L LL L LL L LL L LM M MM M MM M MM M MM M MM M M
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P PP PP PP PP PQ QQ QQ QQ QQ Q
R R RR R RR R RR R RR R RR R RS S SS S SS S SS S SS S SS S ST TT TT TT TT TT T
U UU UU UU UU UU UV V VV V VV V VV V VV V VW W WW W WW W WW W WW W W
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b bb bb bb bb bc cc cc cc cc c
d d dd d dd d dd d dd d dd d dd d dd d dd d de e ee e ee e ee e ee e ee e ee e ee e ee e e
f f f f f ff f f f f ff f f f f ff f f f f ff f f f f ff f f f f ff f f f f ff f f f f ff f f f f fg g g g gg g g g gg g g g gg g g g gg g g g gg g g g gg g g g gg g g g gg g g g g
ME generator AMEGIC++(at tree level, provides HP and HD in SM, MSSM, ADD)
IS and FS shower module APACIC++(virtuality ordered, PYTHIA-like showers)
Combination of ME and PSaccording to CKKW
Simulation of multiple parton interactionsmain ideas based on T. Sjöstrand and M. van Zijl, Phys. Rev. D36 (1987)
Interface to PYTHIA’s string hadronization
Interface to PYTHIA’s hadron decays
Sherpa is the event generation framework:
- initialization of the different phases - interplay of the various stages -- steering the event generation -
Jan Winter HERA/LHC workshop at CERN, Geneva, June 7, 2006 – p.6
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.
Jan Winter HERA/LHC workshop at CERN, Geneva, June 7, 2006 – p.7
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)
Q1Q
Q2
Q1 Q
Q2
Q
Q1
a) b)
c)
∆q(Qjet,Q1)
∆q(Qjet,Q2)
∆q(Qjet,Q1)
∆q(Qjet,Q2)
∆g(Qjet,Q2)
Q1
Q2
W=∆g(Qjet,Q2)[∆q(Qjet,Q1)]2αs(Q2)
αs(Qjet)
Jan Winter HERA/LHC workshop at CERN, Geneva, June 7, 2006 – p.8
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).
Jan Winter HERA/LHC workshop at CERN, Geneva, June 7, 2006 – p.9
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.
Jan Winter HERA/LHC workshop at CERN, Geneva, June 7, 2006 – p.10
Preliminary DØ results in Z+jet-productionThe DØ collaboration, DØ note 5066-CONF
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.
Jan Winter HERA/LHC workshop at CERN, Geneva, June 7, 2006 – p.11
Preliminary DØ results in Z+jet-productionThe DØ collaboration, DØ note 5066-CONF
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
Preliminary DØ results in Z+jet-productionThe DØ collaboration, DØ note 5066-CONF
Jet spectra: 2nd jet, data vs. PYTHIA (left) and SHERPA (right).
20 40 60 80 100 120 140 160 180
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D0 RunII Preliminary
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PYTHIA: slope in the ratio gets increased.
SHERPA: as before, nearly consistent with data, the 80 GeV problem!
Jan Winter HERA/LHC workshop at CERN, Geneva, June 7, 2006 – p.13
Preliminary DØ results in Z+jet-productionThe DØ collaboration, DØ note 5066-CONF
Jet spectra: 3rd jet, data vs. PYTHIA (left) and SHERPA (right).
20 40 60 80 100 120
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D0 RunII Preliminary
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D0 RunII Preliminary
jet [GeV]rd 3T
p
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With the same pattern as before.
Jan Winter HERA/LHC workshop at CERN, Geneva, June 7, 2006 – p.14
Preliminary DØ results in Z+jet-productionThe DØ collaboration, DØ note 5066-CONF
Eta difference between the two hardest jets in incl Z/γ∗ + 2 jets.
0 1 2 3 4 5 60
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D0 RunII Preliminary
(jet,jet)η ∆
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D0 RunII Preliminary
(jet,jet)η ∆
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ata
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Data vs. PYTHIA Data vs. SHERPA
Studying angular correlations; these should fall into the domain of ME.
Both predictions are consistent with the data.
Jan Winter HERA/LHC workshop at CERN, Geneva, June 7, 2006 – p.15
Preliminary DØ results in Z+jet-productionThe DØ collaboration, DØ note 5066-CONF
Phi difference between the two hardest jets in incl Z/γ∗ + 2 jets.
0 0.5 1 1.5 2 2.5 30
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Data vs. PYTHIA Data vs. SHERPA
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
Preliminary DØ results in Z+jet-productionThe DØ collaboration, DØ note 5066-CONF
Transverse momentum of the third jet under the central-jet condition.
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Data vs. PYTHIA Data vs. SHERPA
Central-jet studies according to Zeppenfeld ideas:|η1 − η2| > 2.0 and η1,2 < η3 < η2,1.
Jan Winter HERA/LHC workshop at CERN, Geneva, June 7, 2006 – p.17
Preliminary DØ results in Z+jet-productionThe DØ collaboration, DØ note 5066-CONF
Eta of third jet using the Zeppenfeld definition.
-2 -1 0 1 20
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D0 RunII Preliminary
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Data vs. PYTHIA Data vs. SHERPA
Number of events passing tagging criteria might be toolow, for PYTHIA even worse.
η∗ = η3 −η1 + η2
2
Jan Winter HERA/LHC workshop at CERN, Geneva, June 7, 2006 – p.18
Preliminary DØ results in Z+jet-productionThe DØ collaboration, DØ note 5066-CONF
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.
Jan Winter HERA/LHC workshop at CERN, Geneva, June 7, 2006 – p.19
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.
Jan Winter HERA/LHC workshop at CERN, Geneva, June 7, 2006 – p.20
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.
Jan Winter HERA/LHC workshop at CERN, Geneva, June 7, 2006 – p.20
Merging approach comparison between ...the MLM, LL and SHERPA ME-PS-merging has started: hep-ph/0602031.
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
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.
Jan Winter HERA/LHC workshop at CERN, Geneva, June 7, 2006 – p.20
Merging approach comparison between ...the MLM, LL and SHERPA ME-PS-merging has started: hep-ph/0602031.
ET jet spectra atTevatron Run IIET jet spectra at Run IIAlpgen µR × 0.5
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
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.
Jan Winter HERA/LHC workshop at CERN, Geneva, June 7, 2006 – p.20
Merging approach comparison between ...the MLM, LL and SHERPA ME-PS-merging has started: hep-ph/0602031.
ET jet spectra atTevatron Run IIET jet spectra at Run IIAlpgen µR × 0.5
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
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.
Jan Winter HERA/LHC workshop at CERN, Geneva, June 7, 2006 – p.20
Merging approach comparison between ...the MLM, LL and SHERPA ME-PS-merging has started: hep-ph/0602031.
ET jet spectra atTevatron Run IIET jet spectra at Run IIAlpgen µR × 0.5
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
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.
Jan Winter HERA/LHC workshop at CERN, Geneva, June 7, 2006 – p.20
Merging approach comparison between ...the MLM, LL and SHERPA ME-PS-merging has started: hep-ph/0602031.
ET jet spectra atTevatron Run IIET 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 II
pT (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.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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µ µ µ µ µ µµ µ µ µ µ µµ µ µ µ µ µ
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¼ ¼ ¼¼ ¼ ¼¼ ¼ ¼¼ ¼ ¼¼ ¼ ¼¼ ¼ ¼¼ ¼ ¼¼ ¼ ¼¼ ¼ ¼½ ½ ½½ ½ ½½ ½ ½½ ½ ½½ ½ ½½ ½ ½½ ½ ½½ ½ ½½ ½ ½
¾ ¾ ¾ ¾ ¾ ¾¾ ¾ ¾ ¾ ¾ ¾¾ ¾ ¾ ¾ ¾ ¾¾ ¾ ¾ ¾ ¾ ¾¾ ¾ ¾ ¾ ¾ ¾¾ ¾ ¾ ¾ ¾ ¾¾ ¾ ¾ ¾ ¾ ¾¾ ¾ ¾ ¾ ¾ ¾¾ ¾ ¾ ¾ ¾ ¾¿ ¿ ¿ ¿ ¿¿ ¿ ¿ ¿ ¿¿ ¿ ¿ ¿ ¿¿ ¿ ¿ ¿ ¿¿ ¿ ¿ ¿ ¿¿ ¿ ¿ ¿ ¿¿ ¿ ¿ ¿ ¿¿ ¿ ¿ ¿ ¿¿ ¿ ¿ ¿ ¿
ME generator AMEGIC++
IS/FS shower module APACIC++
Combination of ME and PSaccording to CKKW
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
... .
Jan Winter HERA/LHC workshop at CERN, Geneva, June 7, 2006 – p.22