WHIZARD Generator - DESYreuter/downloads/2018_MBI_WHIZARD.pdf · J.R.Reuter Status of WHIZARD MBI 2018, U. of Michigan, Ann Arbor, 28.08.18 Phase Space Integration 7 / 22 WHIZARD

J.R.Reuter Status of WHIZARD MBI 2018, U. of Michigan, Ann Arbor, 28.08.18

/ 22

Jürgen R. Reuter, DESY

Status of theWHIZARD Generator

1


/ 22 2WHIZARD: Some (technical) facts

WHIZARD Team: Wolfgang Kilian, Thorsten Ohl, JRRSimon Braß/Vincent Rothe/Christian Schwinn/Marco Sekulla/So Young Shim/Pascal Stienemeier/Zhijie Zhao +

2 Master

General WHIZARD reference: EPJ C71 (2011) 1742, arXiv:0708.4241

O’Mega (ME generator): LC-TOOL (2001) 040; arXiv:hep-ph/0102195

VAMP (MC integrator): CPC 120 (1999) 13; arXiv:hep-ph/9806432

CIRCE (beamstrahlung): CPC 101 (1997) 269; arXiv:hep-ph/9607454

Parton shower: JHEP 1204 (2012) 013; arXiv:1112.1039

Color flow formalism: JHEP 1210 (2012) 022; arXiv:1206.3700

NLO capabilities: JHEP 1612 (2016) 075; arXiv: 1609.03390

Parallelization of MEs: CPC 196 (2015) 58; arXiv:1411.3834

POWHEG matching: EPS-HEP (2015) 317; arXiv: 1510.02739

WHIZARD v2.6.4 (23.08.2018) http://whizard.hepforge.org <[email protected]>

PUBLICATIONS

Programming Languanges: Fortran2008 (gfortran ≥4.8.4), OCaml (≥3.12.0) Standard installation: configure <FLAGS>, make, [make check], make installLarge self test suite, unit tests [module tests], regression testingContinous integration system (gitlab CI @ Siegen)

http://whizard.hepforge.org

http://desy.de


/ 22 3WHIZARD: Introduction / Technical Facts

• Universal event generator for lepton and hadron colliders

• Tree ME generatorO’Mega optimized ME generator

Interfaces to external packages: FastJet, GoSam, GuineaPig(++), HepMC, HOPPET, LCIO, LHAPDF(5/6), LoopTools, OpenLoops, PYTHIA6 [internal], PYTHIA8, Recola, StdHep [internal], Tauola [internal]

• Generator/simulation tool for lepton collider beam spectra: CIRCE1/2

• Event formats: LHE, StdHEP, HepMC, LCIO + several ASCII

Scattering processes and [auto-] decays

Factorized processes with spin correlations [variants: no correlations, definite helicity,

predefined branching ratios]

Scripting language for the steering: SINDARIN

Beam structure: polarization, asymmetric beams, crossing angle, structured beams, decays

beams = e1, E1 beams_pol_density = @(-1), @(+1) beams_pol_fraction = 80%, 30%

beams = p, pbar => lhapdf $lhapdf = “NNPDF3”

beams = e1, E1 => circe2 => isr => ewa

integral (br_hZA_redef) = 200 keV

NEW


/ 22 4Spin Correlation and Polarization in CascadesCascade decay, factorize production and decay

0

200

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600

800

0 200 400 600Minv(jℓ)

#evt/bin

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200

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600

800

1000

0 200 400 600Minv(jℓ)

#evt/bin

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#evt/binsimulate (fullproc)

0

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600

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#evt/binsimulate (casc)

?diagonal_decay = true ?isotropic_decay = true


/ 22 4Spin Correlation and Polarization in CascadesCascade decay, factorize production and decay

0

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800

0 200 400 600Minv(jℓ)

#evt/bin

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0 200 400 600Minv(jℓ)

#evt/bin

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0 200 400 600Minv(jℓ)

#evt/binsimulate (fullproc)

0

200

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600

800

0 200 400 600Minv(jℓ)

#evt/binsimulate (casc)

?diagonal_decay = true ?isotropic_decay = true

unstable “W+” { decay_helicity = 0 }Possibility to select specific helicity in decays!


/ 22 5 e+e− Beamspectra

e+e� ! µ̃+µ̃�

3 TeV

Courtesy to Philipp Roloff



High-energy e+e- colliders need to achieve extreme luminositiesPrice for limited AC power: high bunch charges and tiny cross sectionsDense beams generate strong EM fields: deflect particles in other bunch (beamstrahlung)



High-energy e+e- colliders need to achieve extreme luminositiesPrice for limited AC power: high bunch charges and tiny cross sectionsDense beams generate strong EM fields: deflect particles in other bunch (beamstrahlung)


/ 22 6Inclusive Lepton Collider ISR includedSoft exponentiation to all orders

Gribov/Lipatov, 1971✏ =

↵

⇡q2e ln

⇣ s

m2

⌘

f0(x) = ✏ · (1� x)�1+✏

Hard-collinear photons up to 3rd QED order




↵

⇡q2e ln

⇣ s

m2

⌘

f0(x) = ✏ · (1� x)�1+✏


Kuraev/Fadin, 1983; Skrzypek/Jadach, 1991

f3(x) = g3(✏) f0(x)�✏

2(1 + x)

� ✏2

8

✓1 + 3x2

1� xlnx+ 4(1 + x) ln(1� x) + 5 + x

◆

� ✏3

48

✓(1 + x)

⇥6Li2(x) + 12 ln2(1� x)� 3⇡2

⇤+ 6(x+ 5) ln(1� x)

+1

1� x

3

2(1 + 8x+ 3x2) lnx+ 12(1 + x2) lnx ln(1� x)

�1

2(1 + 7x2) ln2 x+

1

4(39� 24x� 15x2)

�◆

g3(✏) = 1 +3

4✏+

27� 8⇡2

96✏2 +

27� 24⇡2 + 128⇣(3)

384✏3 ⇣(3) = 1.20205690315959428539973816151 . . .




↵

⇡q2e ln

⇣ s

m2

⌘

f0(x) = ✏ · (1� x)�1+✏


Kuraev/Fadin, 1983; Skrzypek/Jadach, 1991

f3(x) = g3(✏) f0(x)�✏

2(1 + x)

� ✏2

8

✓1 + 3x2

1� xlnx+ 4(1 + x) ln(1� x) + 5 + x

◆

� ✏3

48

✓(1 + x)

⇥6Li2(x) + 12 ln2(1� x)� 3⇡2

⇤+ 6(x+ 5) ln(1� x)

+1

1� x

3

2(1 + 8x+ 3x2) lnx+ 12(1 + x2) lnx ln(1� x)

�1

2(1 + 7x2) ln2 x+

1

4(39� 24x� 15x2)

�◆

g3(✏) = 1 +3

4✏+

27� 8⇡2

96✏2 +

27� 24⇡2 + 128⇣(3)

384✏3 ⇣(3) = 1.20205690315959428539973816151 . . .

[from J.-J. Blaising]


/ 22 7Phase Space Integration

WHIZARD algorithm: heuristics to classify phase-space topology, adaptive multi-channel mapping ⟹ resonant, t-channel, radiation, infrared, collinear, off-shell

Complicated processes: factorization into production and decay with the unstable option

Resonance-aware factorization for NLO processes and parton showers (e.g. e+e− → jjjj)

Integration display

?vis_history = true

- VAMP: adaptive multi-channel Monte Carlo integrator - VAMP2: fully MPI-parallelized version, using RNG stream generator


/ 22 8MPI Parallelization

Event generation trivially parallelizable Major bottleneck: adaptive phase space integration (generation of grids) Parallelization of integration: OMP multi-threading for different helicities since long NEW (after v2.5.0/2.6.4): MPI parallelization (using OpenMPI or MPICH) Distributes workers over multiple cores, grid adaption needs non-trivial communication Amdahl’s law:

Speedups of 10 to 30, saturation at O(100) tasks Integration times go down from weeks to hours! [can do also parallel event generation]

s = 11�p+ p

N

Braß/Kilian/JRR, soon-ish


/ 22 9 LHC VBS: Comparison LO & LO+PSBallestrero et al., 1803.07943

10-4

10-3LO

dσ/d

mj 1j

2 [fb/

GeV

]

BONSAY

MG5_aMC

MoCaNLO+Recola

PHANTOM

POWHEG

VBFNLO

WHIZARD

10-4

10-3

0.9

1

1.1

500 1000 1500 2000 2500 3000 3500 4000Ratio

/MoC

aNLO

+Rec

ola

mj1j2 [GeV]

0.9

1

1.1

500 1000 1500 2000 2500 3000 3500 4000

0

0.1

0.2

0.3

0.4

0.5LO

dσ/d

Δy j 1

j 2 [fb]

BONSAY

MG5_aMC

MoCaNLO+Recola

PHANTOM

POWHEG

VBFNLO

WHIZARD

0

0.1

0.2

0.3

0.4

0.5

0.9

1

1.1

3 4 5 6 7 8 9Ratio

/MoC

aNLO

+Rec

ola

Δyj1j2

0.9

1

1.1

3 4 5 6 7 8 9

LOLO+PS

pT,` > 20 GeV |y`| < 2.5 �R`` > 0.3

pT,miss > 40 GeV

Anti-kT jets with R = 0.4:

pT,j > 30 GeV |yj | < 4.5 �R`j > 0.3

mjj > 500 GeV |�yjj | > 2.5<latexit sha1_base64="0ogN2lf5YUV+jlU4JKdDZXQSBFk=">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</latexit><latexit sha1_base64="0ogN2lf5YUV+jlU4JKdDZXQSBFk=">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</latexit><latexit sha1_base64="0ogN2lf5YUV+jlU4JKdDZXQSBFk=">AAADeHicdVLbbtNAEHUcLiXcUnjsy4i4AiSIbDcVCEFVLhI8lqpJK8WRtV5Pkk3WF7zrQrT1L/BxvPEhvPDE2nELpOlIlkYzZ845e+Qg5UxI2/7ZMJvXrt+4uXGrdfvO3Xv325sPBiLJM4p9mvAkOwmIQM5i7EsmOZ6kGZIo4HgczN+X++NTzARL4iO5SHEUkUnMxowSqUf+ZuO7F+CExYpiLDErWlbqq6NnHnJewB64tgUfcQDel5yEYHkcx/Js4ZdrL2OTqTyD1+B2d60LxAfkksChrypMTWN3d6yW53mnIiUUlRtFF0ISv0kVMSGKEtir9VbBb2PJnltz/8iCGUoBX5mcgnUIbzR1z3q1Cocl+ayk3Fn/hNlf/70r/cPsKvfKq7JXGYYFWJGvZhV0116nBjXrYgk7V96rkitaHsbhef5+u2N37argcuPUTceo68Bv//DChOaRPqecCDF07FSOFMkkoxw1eS5Q256TCQ51G5MIxUhV5gvY1pMQxkmmv1hCNf33QpFIiEUUaGRE5FSs7srhut0wl+OXI8XiNJcY06XQOOcgEyj/QghZhlTyhW4IzZj2CnRKMkJ1BqKlQ3BWn3y5Gbhdx+46n93O/rs6jg1jy3hkPDEc44Wxb3wyDoy+QRu/zC3TMrfN301oPm4+XULNRn3z0Pivmu4f4acOiQ==</latexit><latexit sha1_base64="0ogN2lf5YUV+jlU4JKdDZXQSBFk=">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</latexit>



10-4

10-3LO

dσ/d

mj 1j

2 [fb/

GeV

]

BONSAY

MG5_aMC

MoCaNLO+Recola

PHANTOM

POWHEG

VBFNLO

WHIZARD

10-4

10-3

0.9

1

1.1

500 1000 1500 2000 2500 3000 3500 4000Ratio

/MoC

aNLO

+Rec

ola

mj1j2 [GeV]

0.9

1

1.1

500 1000 1500 2000 2500 3000 3500 4000

0

0.1

0.2

0.3

0.4

0.5LO

dσ/d

Δy j 1

j 2 [fb]

BONSAY

MG5_aMC

MoCaNLO+Recola

PHANTOM

POWHEG

VBFNLO

WHIZARD

0

0.1

0.2

0.3

0.4

0.5

0.9

1

1.1

3 4 5 6 7 8 9Ratio

/MoC

aNLO

+Rec

ola

Δyj1j2

0.9

1

1.1

3 4 5 6 7 8 9

LOLO+PS

pT,` > 20 GeV |y`| < 2.5 �R`` > 0.3

pT,miss > 40 GeV


pT,j > 30 GeV |yj | < 4.5 �R`j > 0.3




10-4

10-3LO

dσ/d

mj 1j

2 [fb/

GeV

]

BONSAY

MG5_aMC

MoCaNLO+Recola

PHANTOM

POWHEG

VBFNLO

WHIZARD

10-4

10-3

0.9

1

1.1

500 1000 1500 2000 2500 3000 3500 4000Ratio

/MoC

aNLO

+Rec

ola

mj1j2 [GeV]

0.9

1

1.1

500 1000 1500 2000 2500 3000 3500 4000

0

0.1

0.2

0.3

0.4

0.5LO

dσ/d

Δy j 1

j 2 [fb]

BONSAY

MG5_aMC

MoCaNLO+Recola

PHANTOM

POWHEG

VBFNLO

WHIZARD

0

0.1

0.2

0.3

0.4

0.5

0.9

1

1.1

3 4 5 6 7 8 9Ratio

/MoC

aNLO

+Rec

ola

Δyj1j2

0.9

1

1.1

3 4 5 6 7 8 9

LOLO+PS

pT,` > 20 GeV |y`| < 2.5 �R`` > 0.3

pT,miss > 40 GeV


pT,j > 30 GeV |yj | < 4.5 �R`j > 0.3


First official use of MPI-parallelized phase space & first published application of WHIZARD & HERWIG showering

cf. talk by Marco Zaro


/ 22 10Keep resonances in ME-PS merging

• Problem: e+e− → jjjj not dominated by highest αs power, but by resonances e+e− → WW/ZZ → (jj)(jj)

• Solution: proper merging with resonant subprocesses by means of resonance histories • WHIZARD v2.6.0: option to set resonance histories

?resonance_history = true resonance_on_shell_limit = 4






#jets






#jets

#particles

# vis. particles

#photons

E (photon)

#charged tracks






#jets

#particles

# vis. particles

#photons

E (photon)

#charged tracks

• Some first tests started on e+e− → 6j ; future tests will also include tests with resonant H → bb


/ 22 11BSM Models in WHIZARD

Automated models: interface to SARAH/BSM Toolbox Staub, 0909.2863; Ohl/Porod/Staub/Speckner, 1109.5147

Automated models: interface to FeynRules Christensen/Duhr; Christensen/Duhr/Fuks/JRR/Speckner, 1010.3251

MODEL TYPE with CKM matrix trivial CKM

Yukawa test model --- Test

QED with e, µ, ⌧, � --- QED

QCD with d, u, s, c, b, t, g --- QCD

Standard Model SM CKM SM

SM with anomalous gauge couplings SM ac CKM SM ac

SM with Hgg, H��, Hµµ, He+e�

SM Higgs CKM SM Higgs

SM with bosonic dim-6 operators --- SM dim6

SM with charge 4/3 top --- SM top

SM with anomalous top couplings --- SM top anom

SM with anomalous Higgs couplings --- SM rx/NoH rx/SM ul

SM extensions for V V scattering --- SSC/AltH/SSC 2/SSC AltT

SM with Z0

--- Zprime

Two-Higgs Doublet Model THDM CKM THDM

Higgs Singlet Extension --- HSExt

MSSM MSSM CKM MSSM

MSSM with gravitinos --- MSSM Grav

NMSSM NMSSM CKM NMSSM

extended SUSY models --- PSSSM

Littlest Higgs --- Littlest

Littlest Higgs with ungauged U(1) --- Littlest Eta

Littlest Higgs with T parity --- Littlest Tpar

Simplest Little Higgs (anomaly-free) --- Simplest

Simplest Little Higgs (universal) --- Simplest univ

SM with graviton --- Xdim

UED --- UED

“SQED” with gravitino --- GravTest

Augmentable SM template --- Template<latexit 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Automated models: UFO interface [new WHIZARD/O’Mega model format]














SM with Z0

--- Zprime



MSSM MSSM CKM MSSM










UED --- UED







Automated models: UFO interface [new WHIZARD/O’Mega model format]














SM with Z0

--- Zprime



MSSM MSSM CKM MSSM










UED --- UED



by So Young Shimheavily used

for CLIC Yellow Report multi-boson

studies (VVV + VBS)


/ 22 12Models from UFO Files in WHIZARDmodel = SM (ufo) UFO file is assumed to be in working directory OR

Old FeynRules / SARAH interface will get deprecated

kept at the moment for user backwards compatibility

All the setup works the same as for intrinsic models

model = SM (ufo (“<my UFO path>”))

All SM-like models/scalar extensions already supportedHigher-dim. operators, general Lorentz/color structures is work in progress

UFO file is in user-specified directory


/ 22 13

Model-independent EFT: either weakly-coupled resonances in reach or strongly-coupled sectors Alboteanu/Kilian/JRR, 0806.4145; Kilian/Ohl/JRR/Sekulla, 1408.6207

Parameterize new physics by dim 6/dim 8 operators, calculate unitarity limits Dim.-8 operators for longitudinal/mixed/transverse modes Brass/Fleper/Kilian/JRR/Sekulla

T-matrix unitarization implemented in WHIZARD (both for operators and resonances)

New Physics in Vector Boson Scattering: LHC

i2

i

aS

a0

aT

T-matrix

��a� aK2

�� = aK2 ) a = 1

Re⇣

1a0

⌘�i

200 400 600 800 1000 1200 1400 1600 1800 2000M(W+W+)[GeV]

10�4

10�3

10�2

10�1

100

101

@�

@M

⇥fb

100G

eV

⇤

pp ! W+W+jj

FS,0 = 480 TeV�4

FS,1 = 480 TeV�4

FHD = 30 TeV�2

SM

200 400 600 800 1000 1200 1400 1600 1800 2000M(W+W+)[GeV]

10�4

10�3

10�2

10�1

100

101

@�

@M

⇥fb

100G

eV

⇤

pp ! W+W+jj

FS,0 = 480 TeV�4

FS,1 = 480 TeV�4

FHD = 30 TeV�2

SM

Unitarity limits


/ 22 14 New Physics in VBS: LHC & Lepton Colliders

Braß/Fleper/Kilian/JRR/Sekulla, 1807.02512



Transversal (&mixed) operators:

Much more room for new physics




Transversal (&mixed) operators:

Much more room for new physics


Resonances might be in LHC direct reachEFT framework EW-restored regime: SU(2)L ⨉ SU(2)R , SU(2)L ⨉ U(1)Y gauged

Apply T-matrix unitarization beyond resonance (“UV-incomplete” model)

isoscalar isotensor

scalar �0��t ,��

t ,�0t ,�

+t ,�

++t

��v ,�

0v,�

+v

�0s

tensor f0

0

@X��

t , X�t , X0

t , X+t , X++

t

X�v , X0

v , X+v

X0s

1

A

. . . . . . . . .


/ 22Comparison: Simplified Models & EFTBlack dashed line: saturation of A22(W+W+)/A00(ZZ)

400 600 800 1000 1200 1400 1600 1800 2000M(ZZ)[GeV]

10�2

10�1

100

101

@�

@M

⇥fb

100G

eV

⇤

pp ! ZZjj

FS,1 = 12.3 TeV�4

F� = 4.0 TeV�1

SMlimit of A00

M� = 800GeV�� = 80GeV

400 600 800 1000 1200 1400 1600 1800 2000M(W+W+)[GeV]

10�2

10�1

100

101

@�

@M

⇥fb

100G

eV

⇤

pp ! W+W+jj

FS,0 = 19.2 TeV�4FS,1 = -134.1 TeV�4

FX = 38.6 TeV�1

SMlimit of A22

MX = 1800GeV�X = 720GeV

Kilian/Ohl/JRR/Sekulla: 1511.00022

15

Mjj > 500GeV; �⌘jj > 2.4; pjT > 20GeV; |�⌘j | < 4.5


/ 22Comparison: Simplified Models & EFT 15

Brass/Fleper/Kilian/JRR/Sekulla: 1807.02512

Mjj > 500GeV; �⌘jj > 2.4; pjT > 20GeV; |�⌘j | < 4.5



Fleper/Kilian/JRR/Sekulla: 1607.03030

1.0 TeV 1.4 TeV3.0 TeV

no pol.

CLIC (3 TeV)



Unitarity limits for pp → VVVWIP: Brass/Kilian/JRR/Sekulla: 18XX.xxxxx

Fleper/Kilian/JRR/Sekulla: 1607.03030

1.0 TeV 1.4 TeV3.0 TeV

no pol.

CLIC (3 TeV)


/ 22

FKS subtraction [Frixione/Kunszt/Signer, hep-ph/9512328]

Resonance-aware treatment [Ježo/Nason, 1509.09071]

Virtual MEs external

Real and virtual subtraction terms internal

NLO decays available for the NLO processes

Fixed order events for plotting (weighted)

Automated POWHEG damping and matching

NLO QCD: final validation NLO EW started

New refactoring phase (3rd NLO refactoring)

16NLO Automation in WHIZARD

Working NLO interfaces to: ★ GoSam [N. Greiner, G. Heinrich, J. v. Soden-Fraunhofen et al.] ★ OpenLoops [F. Cascioli, J. Lindert, P. Maierhöfer, S. Pozzorini] ★ Recola [A. Denner, L. Hofer, J.-N. Lang, S. Uccirati]

NLO QCD (massless & massive) fully supported

alpha_power = 2 alphas_power = 0

process eett = e1,E1 => t, tbar { nlo_calculation = “full” }

List of validated NLO QCD processes• e

+e� ! jj

• e+e� ! jjj

• e+e� ! `

+`�jj

• e+e� ! `

+⌫`jj

• e+e� ! tt̄

• e+e� ! tt̄tt̄

• e+e� ! tt̄W

+jj

• e+e� ! tW

�b

• e+e� ! W

+W

�bb̄, `

+`�⌫`⌫̄`bb̄

• e+e� ! bb̄`

+`�

• e+e� ! tt̄H

• e+e� ! W

+W

�bb̄H, `

+`�⌫`⌫̄`bb̄H

• pp ! `+`�

• pp ! `⌫

• pp ! ZZ

• e+e� ! jj

• e+e� ! jjj

• e+e� ! `

+`�jj

• e+e� ! `

+⌫`jj

• e+e� ! tt̄

• e+e� ! tt̄tt̄

• e+e� ! tt̄W

+jj

• e+e� ! tW

�b

• e+e� ! W

+W

�bb̄, `

+`�⌫`⌫̄`bb̄

• e+e� ! bb̄`

+`�

• e+e� ! tt̄H

• e+e� ! W

+W

�bb̄H, `

+`�⌫`⌫̄`bb̄H

• pp ! `+`�

• pp ! `⌫

• pp ! ZZ


/ 22 17

0.125 0.25 0.5 1.0 2.0 4.0 8.0µR/mt

0.95

0.975

1.0

1.025

�(µ

R)/

�(µ

R=

µ0)

WHIZARD+OPENLOOPS

NLO tt̄NLO W +W �bb̄, �t = �t(µR)NLO W +W �bb̄, �t = �t(mt)

e+e� ! tt̄ and e+e� ! W +W �bb̄ atp

s = 800 GeV

NLO QCD Results for off-shell e+e− → ttH

Chokoufé/Kilian/Lindert/Pozzorini/JRR/Weiss, 1609.03390

0.00

0.50

1.00

1.50

2.00

2.50

3.00

�[fb

]

WHIZARD+OPENLOOPS

LO tt̄HNLO tt̄HLO W +W �bb̄HNLO W +W �bb̄H

0.75

0.85

0.95

1.05

K-fa

ctor

500 1000 1500 2000 2500 3000ps [GeV]

0.90

1.05

1.20

1.35

�W

+W

�bb̄

H/�

tt̄H

425 500 575ps [GeV]

1.00

1.75

2.50

K-fa

ctor

e+e� ! tt̄H and e+e� ! W +W �bb̄H


/ 22 17

0.125 0.25 0.5 1.0 2.0 4.0 8.0µR/mt

0.95

0.975

1.0

1.025

�(µ

R)/

�(µ

R=

µ0)

WHIZARD+OPENLOOPS

NLO tt̄NLO W +W �bb̄, �t = �t(µR)NLO W +W �bb̄, �t = �t(mt)

e+e� ! tt̄ and e+e� ! W +W �bb̄ atp

s = 800 GeV

NLO QCD Results for off-shell e+e− → ttH

0.125 0.25 0.5 1.0 2.0 4.0 8.0µR/(mt + mH)

0.9

0.95

1.0

1.05

�(µ

R)/

�(µ

R=

µ0)

WHIZARD+OPENLOOPS

NLO tt̄HNLO W +W �bb̄H, �t = �t(µR)NLO W +W �bb̄H, �t = �t(mt)

e+e� ! tt̄H and e+e� ! W +W �bb̄H atp

s = 800 GeV

Chokoufé/Kilian/Lindert/Pozzorini/JRR/Weiss, 1609.03390

0.00

0.50

1.00

1.50

2.00

2.50

3.00

�[fb

]

WHIZARD+OPENLOOPS

LO tt̄HNLO tt̄HLO W +W �bb̄HNLO W +W �bb̄H

0.75

0.85

0.95

1.05

K-fa

ctor

500 1000 1500 2000 2500 3000ps [GeV]

0.90

1.05

1.20

1.35

�W

+W

�bb̄

H/�

tt̄H

425 500 575ps [GeV]

1.00

1.75

2.50

K-fa

ctor

e+e� ! tt̄H and e+e� ! W +W �bb̄H


/ 22 18Top Threshold/Continuum in WHIZARD

LC top threshold scan best-known method to measure top quark mass, ΔΜ ~ 30-70 MeV

LC continuum top production best-known method to measure top couplings

WHIZARD provides special model for top threshold

Matches threshold resummation with NLO QCD

Allows for (almost) fully exclusive final states

Chokoufé/Hoang/Kilian/JRR/Stahlhofen/Teubner/Weiss, 1712.02220 [JHEP 1803(2018)184]

Allows to study top mass dependence of differential distributions at threshold

0

100

200

300

400

500

600

700

800

900

1000

�[fb

]

matched, no switch-offNLLmatched, combined, symmetrizedNLO

330 340 350 360 370 380ps [GeV]

0.80

0.90

1.00

1.10

1.20

Unc

erta

inti

es

330 340 350 360 370 380ps [GeV]

0

100

200

300

400

500

600

700

800

900

1000

�[fb

]

matched, no switch-offNLLmatched, combined, symmetrizedNLO

Matched inclusive W +bW �b̄ cross section, no QED ISR


/ 22 19Interface between WHIZARD — PYTHIA8

• Intention: directly communicate between event records of WHIZARD and PYTHIA8 • No intermediate files• Allows for using all the machinery for matching and merging from PYTHIA8


/ 22 19Interface between WHIZARD — PYTHIA8

• Intention: directly communicate between event records of WHIZARD and PYTHIA8 • No intermediate files• Allows for using all the machinery for matching and merging from PYTHIA8

$shower_method = “PYTHIA8” $hadronization_method = “PYTHIA8”

Allows to use the PYTHIA8 toolbox for matching


/ 22 20Gridpack functionality in WHIZARD

Implemented by Wolfgang Kilian [on sabbatical at CERN w. CLICdp 03/2018-08/2018]

Workspace subdirectory for GRID communication: job ID

Pack and unpack features: transfers whole directories, relies on tar

./whizard --job_id “42”

$grid_path = “<afs/…/…>”

[actually for the integration grids!]

./whizard -J “42”

or

./whizard script1_tar.sin --pack my_workspace

$compile_workspace = “my_workspace”script1_tar.sin contains

On the remote machine, you can run this with

./whizard script2_tar.sin --unpack my_workspace.tgz


/ 22 21Outlook & Plans

WHIZARD 2.6.4 event generator for collider physics (ee, pp, ep)

High-multiplicity SM hard processes (2→10 etc.)

Allows to simulate all possible BSM models

Strong focus on e+e− physics: beam spectra, e+e− ISR, LCIO, polarizations

NLO QCD (almost) done ➝ WHIZARD 3.0 [EW validation started]

Multiboson physics: unitarization for transverse operators / resonances

NEW: UFO models: [WIP: still waiting for general Lorentz structures] MPI parallel integration Possibility to pre-set branching ratios for factorized processes Resonance matching to parton shower Fully integrated PYTHIA8 interface [not yet in official release] Batch mode / gridpack functionality MBI physics: transverse operators/resonances & unitarization


/ 22 22Found on the Internet, available now:


/ 22 22Found on the Internet, available now:


/ 22 23

BACKUP


/ 22 24Decay processes / auto decays

WHIZARD cannot only do scattering processes, but also decays

Example Energy distribution electron in muon decay:model = SM process mudec = e2 => e1, N1, n2 integrate (mudec)

histogram e_e1 (0, 60 MeV, 1 MeV) analysis = record e_e1 (eval E [e1])

n_events = 100000

simulate (mudec)

compile_analysis { $out_file = “test.dat” }

dN/dEe(µ� ! e�⌫̄e⌫µ)

GeV


/ 22 24Decay processes / auto decays

WHIZARD cannot only do scattering processes, but also decays

Example Energy distribution electron in muon decay:model = SM process mudec = e2 => e1, N1, n2 integrate (mudec)

histogram e_e1 (0, 60 MeV, 1 MeV) analysis = record e_e1 (eval E [e1])

n_events = 100000

simulate (mudec)

compile_analysis { $out_file = “test.dat” }

auto_decays_multiplicity = 2 ?auto_decays_radiative = false

unstable Wp () { ?auto_decays = true }

Automatic integration of particle decays

dN/dEe(µ� ! e�⌫̄e⌫µ)

GeV


/ 22 25WHIZARD: Past and recent timeline (I)

Original scope: electroweak (multi-fermion) studies at 1.6 TeV TESLA [≈ 1998–2000]

Milestone: first-ever multi-leg implementation of MSSM v1.25 [2003]

Color flow formalism [≈2005]

Used for many TESLA studies and most ILC CDR and TDR, CLIC CDR and detector LoI studies (versions v1.24, v1.50, v1.95) [≈ 2002–2013]

Major refactoring phase I: LHC physics ➝ v2.0.0 [≈ 2007–2010; 38 months]








Eyjafjallajökull








Validation inside ATLAS and CMS [≈2011–2014]

Refactoring phase II: NLO automation / maintainability ➝ v2.2.0

[≈ 2012–2014; 18 months]

Strong interest of CEPC study group(s) for CEPC simulations [≈ 2013 — now]

04/2015, ALCW’15 Tokyo: LC generator group endorsed v2.2 for new mass productions

FCC-ee interest in simulations: [ca. spring 2016]

Refactoring phase III: first NLO implementation overhaul [2016; 3 months]

Eyjafjallajökull


/ 22 26WHIZARD: Past and recent timeline (II)

Final validation for LC [ee] physics between v1.95 and v2 [until end of 2017]

Special thanks to: [beam spectra, photon background, event formats, shower/hadronization, tau decays]

Mikael Berggren Jean-Jacques Blaising Moritz Habermehl Mo Xin Akiya Miyamoto Tim Barklow Philipp Roloff


/ 22 26WHIZARD: Past and recent timeline (II)

Final validation for LC [ee] physics between v1.95 and v2 [until end of 2017]

Special thanks to: [beam spectra, photon background, event formats, shower/hadronization, tau decays]

Mikael Berggren Jean-Jacques Blaising Moritz Habermehl Mo Xin Akiya Miyamoto Tim Barklow Philipp Roloff

01/2018, CERN, LC generator meeting: only trivial minor, ready for mass production

Refactoring phase IV: core data structure overhaul: NLO [fall 2018; ca. 2-3months]

[dust-layer buried students, total-code-no-man-wasteland alarm]

Preparation phase for WHIZARD 3.0.0 started: … PARALLEL TO ….

Work on: [NLO QCD final validation; structure functions; NLO EW; shower and matching/merging]

(Technical) refactoring phase V: code modernization (submodules etc: gfortran 6.1+ )

[end of 2018 / early 2019; when NAG debugging compiler support ready]


/ 22 27Beam structure: special beams Beam polarization, ILC-like setup

beams = e1, E1 beams_pol_density = @(-1), @(+1) beams_pol_fraction = 80%, 30%

Polarized decays: longitudinal Z

process zee = Z => e1, E1 beams = Z beams_pol_density = @(0)

Scan over polarizations

scan int h1 = (-1,1) { scan int h2 = (-1,1) { beams_pol_density = @(h1), @(h2) integrate (proc) } }

Asymmetric beams

beams = e1, E1 beams_momentum = 100 GeV, 900 GeV

Beams with crossing angle

Beams with rotated crossing angle

beams_momentum = 250 GeV, 250 GeV beams_theta = 0, 10 degree

beams_momentum = 250 GeV, 250 GeV beams_theta = 0, 10 degree beams_phi = 0, 45 degree

Structure functions (also concatenated)

beams = p, p => pdf_builtin $pdf_builtin_set = “mmht2014lo”

beams = p, pbar => lhapdf

beams = e, p => none, pdf_builtin

beams = e1, E1 => circe1 $circe1_acc = “TESLA” ?circe1_generate = false circe1_mapping_slope = 2

beams = e1, E1 => beam_events $beam_events_file = “uniform_spread_2.5%.dat”

beams = e1, E1 => circe2 => isr => ewa


/ 22 28Beam structure: beam polarization Beam polarization

beams_pol_density = @([<spin entries>]), @([<spin entries>]) beams_pol_fraction = <degree beam 1>, <degree beam 2>

Different density matrices

Spin j Particle type possible m values0 Scalar boson 01/2 Spinor +1, -11 (Massive) Vector boson +1, (0), -13/2 (Massive) Vectorspinor +2, (+1), (-1), -22 (Massive) Tensor +2, (+1), (0), (-1), -2

beams_pol_density = @() Unpolarized beams ⇢ =1

|m| I

beams_pol_density = @(±j) beams_pol_fraction = f Circular polarization ⇢ = diag

✓1± f

2, 0 , . . . , 0 ,

1⌥ f

2

◆

beams_pol_density = @(0) beams_pol_fraction = f

Longitudinal polarization (massive)

⇢ = diag

✓1� f

|m| , . . . ,1� f

|m| ,1 + f (|m|� 1)

|m| ,1� f

|m| , . . . ,1� f

|m|

◆

|m| = 2j + 1 massive

massless|m| = 2

beams_pol_density = @(j, -j, j:-j:exp(-I*phi)) beams_pol_fraction = f

Transversal polarization(along an axis) ⇢ =

0

BBBBBBB@

1 0 · · · · · · f2 e�i�

0 0. . . 0

.... . .

. . .. . .

...

0. . . 0 0

f2 ei� · · · · · · 0 1

1

CCCCCCCA

beams_pol_density = @(j:j:1-cos(theta), j:-j:sin(theta)*exp(-I*phi), -j:-j:1+cos(theta)) beams_pol_fraction = f

Polarization along arbitrary axis (θ,Φ)⇢ =

1

2·

0

BBBBBBB@

1� f cos ✓ 0 · · · · · · f sin ✓ e�i�

0 0. . . 0

.... . .

. . .. . .

...

0. . . 0 0

f sin ✓ ei� · · · · · · 0 1 + f cos ✓

1

CCCCCCCAbeams_pol_density = @(j:j:hj, j-1:j-1:hj−1, …, -j:-j:h−j)

beams_pol_density = @({m:m′:xm,m′}) Diagonal / arbitrary density matrices


/ 22 29Resonance mappings for NLO processes

Amplitudes (except for pure QCD/QED) contain resonances (Z, W, H, t) In general: resonance masses not respected by modified kinematics of subtraction terms Collinear (and soft) radiation can lead to mismatch between Born and subtraction terms

Algorithm to include resonance histories [Ježo/Nason, 1509.09071]

Avoids double logarithms in the resonances’ width Most important for narrow resonances (H ➝ bb) Separate treatment of Born and real terms, soft mismatch [, collinear mismatch]









WHIZARD complete automatic implementation: example e+ e− ➝ μμbb (ZZ, ZH histories)

standard FKS






WHIZARD complete automatic implementation: example e+ e− ➝ μμbb (ZZ, ZH histories)

standard FKS FKS with resonance mappings




/ 22 30Event FormatsEvent formats: conventions for outputting details of the events

sample_format = hepmc sample_format = lhef {$lhef_version = “3.0”} sample_format = stdhep, stdhep_up, stdhep_ev4 sample_format = ascii,debug,mokka,lha sample_format = lcio simulate (<process>)

• External format, ASCII: HepMC [Dobbs/Hansen, 2001]

• External format, binary: LCIO [Gaede, 2003]

• Internal formats, binary: StdHEP [Lebrun, 1990]

• Internal formats, ASCII: LHA, LHEF [Alwall et al. , 2006]


/ 22 30Event FormatsEvent formats: conventions for outputting details of the events

sample_format = hepmc sample_format = lhef {$lhef_version = “3.0”} sample_format = stdhep, stdhep_up, stdhep_ev4 sample_format = ascii,debug,mokka,lha sample_format = lcio simulate (<process>)

• External format, ASCII: HepMC [Dobbs/Hansen, 2001]

• External format, binary: LCIO [Gaede, 2003]

• Internal formats, binary: StdHEP [Lebrun, 1990]

• Internal formats, ASCII: LHA, LHEF [Alwall et al. , 2006]

LCIO Format (LC I/O; particle-flow motivated): (ASCII transcription of binary)============================================================================ Event : 1 - run: 0 - timestamp [...] ============================================================================ date: [...] detector : unknown event parameters: parameter Event Number [int]: 1, parameter ProcessID [int]: 1, parameter Run ID [int]: 0, parameter beamPDG0 [int]: 11, parameter beamPDG1 [int]: -11, parameter Energy [float]: 500, parameter Pol0 [float]: 0, parameter Pol1 [float]: 0, parameter _weight [float]: 1, parameter alphaQCD [float]: 0.1178, parameter crossSection [float]: 338.482, parameter crossSectionError [float]: 7.2328, parameter scale [float]: 500, parameter BeamSpectrum [string]: , parameter processName [string]: lcio_5_p, collection name : MCParticle parameters: --------------- print out of MCParticle collection --------------- flag: 0x0 simulator status bits: [sbvtcls] s: created in simulation b: backscatter v: vertex is not endpoint of parent t: decayed in tracker c: decayed in calorimeter l: has left detector s: stopped o: overlay [ id ]index| PDG | px, py, pz | energy |gen|[simstat]| vertex x,y,z | mass | charge | spin | colorflow | [par] - [dau] [00000004] 0| 11| 0.00e+00, 0.00e+00, 2.50e+02| 2.50e+02| 3 |[ 0 ]| 0.0, 0.0, 0.0| 5.11e-04|-1.00e+00| 0.0, 0.0, 0.0| (0, 0) | [] - [2,3] [00000005] 1| -11| 0.00e+00, 0.00e+00,-2.50e+02| 2.50e+02| 3 |[ 0 ]| 0.0, 0.0, 0.0| 5.11e-04| 1.00e+00| 0.0, 0.0, 0.0| (0, 0) | [] - [2,3] [00000006] 2| 13| 1.42e+02, 1.99e+02,-5.22e+01| 2.50e+02| 1 |[ 0 ]| 0.0, 0.0, 0.0| 1.06e-01|-1.00e+00| 0.0, 0.0, 1.0| (0, 0) | [0,1] - [] [00000007] 3| -13|-1.42e+02,-1.99e+02, 5.22e+01| 2.50e+02| 1 |[ 0 ]| 0.0, 0.0, 0.0| 1.06e-01| 1.00e+00| 0.0, 0.0,-1.0| (0, 0) | [0,1] - []

LCIO Format (LC I/O, particle-flow motivated): (ASCII transcription from binary)

Event header information as agreed upon with LC Gen Group

Documents

WHIZARD Generator - DESYreuter/downloads/2018_MBI_WHIZARD.pdf · J.R.Reuter Status of WHIZARD MBI 2018, U. of Michigan, Ann Arbor, 28.08.18 Phase Space Integration 7 / 22 WHIZARD