TeV4LHC Workshop

TeV4LHC - Fermilab October 20, 2005

Rick Field - Florida/CDF Page 1

TeV4LHC WorkshopTeV4LHC Workshop

Rick FieldUniversity of Florida

Proton AntiProton

Multiple Parton Interactions

PT(hard)

Outgoing Parton

Outgoing Parton

Underlying EventUnderlying Event

CDF Run 2

Proton AntiProton

Drell-Yan Production Lepton

Underlying Event Underlying Event

Initial-State Radiation

Anti-Lepton

Talk #1



CDF Run 2 CDF Run 2 Monte Carlo TunesMonte Carlo Tunes

Proton AntiProton




Anti-Lepton

Proton AntiProton

“Hard” Scattering

PT(hard)

Outgoing Parton

Outgoing Parton



Final-State Radiation

Outline of Talk

PT(Z-boson): Tuning to fit the PT(Z) distribution.

Jet Production: Tuning to fit the “underlying event” is high PT jet production.

Energy: Tuning to fit the energy in the “underlying event”.

Drell-Yan: Tuning to fit the “underlying event” in Drell-Yan production.

CDF Run 2 TunesPYTHIA Tune A

PYTHIA Tune A25PYTHIA Tune A50PYTHIA Tune AWPYTHIA Tune Q

PYTHIA Tune QWJIMMY Default

JIMMY 325

Proton AntiProton

Drell-Yan Production

PT(pair)

Lepton-Pair

Outgoing Parton






CDF Run 1 PCDF Run 1 PTT(Z)(Z)

Shows the Run 1 Z-boson pT distribution (<pT(Z)> ≈ 11.5 GeV/c) compared with PYTHIA Tune A (<pT(Z)> = 9.7 GeV/c), Tune A25 (<pT(Z)> = 10.1 GeV/c), and Tune A50 (<pT(Z)> = 11.2 GeV/c).

Z-Boson Transverse Momentum

0.00

0.04

0.08

0.12

0 2 4 6 8 10 12 14 16 18 20

Z-Boson PT (GeV/c)

PT

Dis

trib

uti

on

1/N

dN

/dP

T

CDF Run 1 Data

PYTHIA Tune A

PYTHIA Tune A25

PYTHIA Tune A50

CDF Run 1published

1.8 TeV

Normalized to 1

s = 1.0

s = 2.5

s = 5.0

Parameter Tune ATune A25

Tune A50

MSTP(81) 1 1 1

MSTP(82) 4 4 4

PARP(82) 2.0 GeV 2.0 GeV 2.0 GeV

PARP(83) 0.5 0.5 0.5

PARP(84) 0.4 0.4 0.4

PARP(85) 0.9 0.9 0.9

PARP(86) 0.95 0.95 0.95

PARP(89) 1.8 TeV 1.8 TeV 1.8 TeV

PARP(90) 0.25 0.25 0.25

PARP(67) 4.0 4.0 4.0

MSTP(91) 1 1 1

PARP(91) 1.0 2.5 5.0

PARP(93) 5.0 15.0 25.0

UE Parameters

ISR Parameter

Intrensic KT

PYTHIA 6.2 CTEQ5L




Shows the Run 1 Z-boson pT distribution (<pT(Z)> ≈ 11.5 GeV/c) compared with PYTHIA Tune A (<pT(Z)> = 9.7 GeV/c), Tune A25 (<pT(Z)> = 10.1 GeV/c), and Tune A50 (<pT(Z)> = 11.2 GeV/c).

Parameter Tune ATune A25

Tune A50

MSTP(81) 1 1 1

MSTP(82) 4 4 4

PARP(82) 2.0 GeV 2.0 GeV 2.0 GeV

PARP(83) 0.5 0.5 0.5

PARP(84) 0.4 0.4 0.4

PARP(85) 0.9 0.9 0.9

PARP(86) 0.95 0.95 0.95

PARP(89) 1.8 TeV 1.8 TeV 1.8 TeV

PARP(90) 0.25 0.25 0.25

PARP(67) 4.0 4.0 4.0

MSTP(91) 1 1 1

PARP(91) 1.0 2.5 5.0

PARP(93) 5.0 15.0 25.0

UE Parameters

ISR Parameter

Intrensic KT


1.0E-05

1.0E-04

1.0E-03

1.0E-02

1.0E-01

1.0E+00

0 10 20 30 40 50 60 70 80 90 100

Z-Boson PT (GeV/c)

PT

Dis

trib

uti

on

1/N

dN

/dP

T

CDF Run 1 Data

PYTHIA Tune A

PYTHIA Tune A25

PYTHIA Tune A50

CDF Run 1published

1.8 TeV

Normalized to 1

High pT shape agrees!PYTHIA 6.2 CTEQ5L



Parameter Tune A Tune AW

MSTP(81) 1 1

MSTP(82) 4 4

PARP(82) 2.0 GeV 2.0 GeV

PARP(83) 0.5 0.5

PARP(84) 0.4 0.4

PARP(85) 0.9 0.9

PARP(86) 0.95 0.95

PARP(89) 1.8 TeV 1.8 TeV

PARP(90) 0.25 0.25

PARP(62) 1.0 1.25

PARP(64) 1.0 0.2

PARP(67) 4.0 4.0

MSTP(91) 1 1

PARP(91) 1.0 2.1

PARP(93) 5.0 15.0 The Q2 = kT2 in s for space-like showers is scaled by PARP(64)!

Effective Q cut-off, below which space-like showers are not evolved.


Shows the Run 1 Z-boson pT distribution (<pT(Z)> ≈ 11.5 GeV/c) compared with PYTHIA Tune AW (<pT(Z)> = 11.7 GeV/c).

UE Parameters

ISR Parameters

Intrensic KT


0.00

0.04

0.08

0.12

0 2 4 6 8 10 12 14 16 18 20

Z-Boson PT (GeV/c)

PT

Dis

trib

uti

on

1/N

dN

/dP

T

CDF Run 1 Data

PYTHIA Tune AWCDF Run 1

published

1.8 TeV

Normalized to 1

s = 2.1

PYTHIA 6.2 CTEQ5L




Shows the Run 1 Z-boson pT distribution (<pT(Z)> ≈ 11.5 GeV/c) compared with PYTHIA Tune AW (<pT(Z)> = 11.7 GeV/c).

Parameter Tune A Tune AW

MSTP(81) 1 1

MSTP(82) 4 4


PARP(83) 0.5 0.5

PARP(84) 0.4 0.4

PARP(85) 0.9 0.9

PARP(86) 0.95 0.95


PARP(90) 0.25 0.25

PARP(62) 1.0 1.25

PARP(64) 1.0 0.2

PARP(67) 4.0 4.0

MSTP(91) 1 1

PARP(91) 1.0 2.1

PARP(93) 5.0 15.0

UE Parameters

ISR Parameters

Intrensic KT


1.0E-05

1.0E-04

1.0E-03

1.0E-02

1.0E-01

1.0E+00

0 10 20 30 40 50 60 70 80 90 100

Z-Boson PT (GeV/c)

PT

Dis

trib

uti

on

1/N

dN

/dP

T

CDF Run 1 Data

PYTHIA Tune AWCDF Run 1

published

1.8 TeV

Normalized to 1

PYTHIA 6.2 CTEQ5L




Shows the Run 1 Z-boson pT distribution (<pT(Z)> ≈ 11.5 GeV/c) compared with PYTHIA Tune AW (<pT(Z)> = 11.7 GeV/c) and PYTHIA Tune A25 (<pT(Z)> = 10.1 GeV/c).

Parameter Tune A25 Tune AW

MSTP(81) 1 1

MSTP(82) 4 4


PARP(83) 0.5 0.5

PARP(84) 0.4 0.4

PARP(85) 0.9 0.9

PARP(86) 0.95 0.95


PARP(90) 0.25 0.25

PARP(62) 1.0 1.25

PARP(64) 1.0 0.2

PARP(67) 4.0 4.0

MSTP(91) 1 1

PARP(91) 2.5 2.1

PARP(93) 5.0 15.0

UE Parameters

ISR Parameters

Intrensic KT


0.00

0.04

0.08

0.12

0 2 4 6 8 10 12 14 16 18 20

Z-Boson PT (GeV/c)

PT

Dis

trib

uti

on

1/N

dN

/dP

T

CDF Run 1 Data

PYTHIA Tune A25

PYTHIA Tune AW

s = 2.5

CDF Run 1published

1.8 TeV

Normalized to 1

s = 2.1

PYTHIA 6.2 CTEQ5L




Compares PYTHIA Tune AW with PYTHIA Tune A25 (both normalized to one).


MSTP(81) 1 1

MSTP(82) 4 4


PARP(83) 0.5 0.5

PARP(84) 0.4 0.4

PARP(85) 0.9 0.9

PARP(86) 0.95 0.95


PARP(90) 0.25 0.25

PARP(62) 1.0 1.25

PARP(64) 1.0 0.2

PARP(67) 4.0 4.0

MSTP(91) 1 1

PARP(91) 2.5 2.1

PARP(93) 5.0 15.0

UE Parameters

ISR Parameters

Intrensic KT


1.0E-05

1.0E-04

1.0E-03

1.0E-02

1.0E-01

1.0E+00

0 10 20 30 40 50 60 70 80 90 100

Z-Boson PT (GeV/c)

PT

Dis

trib

uti

on

1/N

dN

/dP

T PYTHIA Tune A25

PYTHIA Tune AWRDF Preliminary

generator level

1.8 TeV

Normalized to 1

PYTHIA 6.2 CTEQ5L




Compares PYTHIA Tune AW with PYTHIA Tune A25 (normalized to agree at high PT(Z)).


MSTP(81) 1 1

MSTP(82) 4 4


PARP(83) 0.5 0.5

PARP(84) 0.4 0.4

PARP(85) 0.9 0.9

PARP(86) 0.95 0.95


PARP(90) 0.25 0.25

PARP(62) 1.0 1.25

PARP(64) 1.0 0.2

PARP(67) 4.0 4.0

MSTP(91) 1 1

PARP(91) 2.5 2.1

PARP(93) 5.0 15.0

UE Parameters

ISR Parameters

Intrensic KT


1.0E-05

1.0E-04

1.0E-03

1.0E-02

1.0E-01

1.0E+00

0 10 20 30 40 50 60 70 80 90 100

Z-Boson PT (GeV/c)

PT

Dis

trib

uti

on

1/N

dN

/dP

T PYTHIA Tune A25

PYTHIA Tune AWRDF Preliminary

generator level

1.8 TeV

Arbitrary Normalization

PYTHIA 6.2 CTEQ5L



Z-bosonregion

Run 2 Drell-YanRun 2 Drell-Yan

Shows the lepton-pair average PT versus the lepton-pair invariant mass at 1.96 TeV for PYTHIA Tune AW and PYTHIA Tune A.

Lepton-Pair Transverse Momentum

0

5

10

15

20

0 50 100 150 200 250

Lepton-Pair Invariant Mass (GeV)

Av

era

ge

Pai

r P

T

Drell-Yan1.96 TeV

RDF Preliminarygenerator level

PY Tune A

PY Tune AW

Lepton-Pair Transverse Momentum

0

5

10

15

20

0 50 100 150 200 250


Av

era

ge

Pai

r P

TDrell-Yan1.96 TeV


PY Tune A5

PY Tune AW

Shows the lepton-pair average PT versus the lepton-pair invariant mass at 1.96 TeV for PYTHIA Tune AW and PYTHIA Tune A5.

Proton AntiProton




Anti-Lepton

<PT(pair)> versus M(pair)

Z-bosonregion



Z-bosonregion

Charged Particle Density: dN/dhdf

0.0

0.2

0.4

0.6

0.8

1.0

0 50 100 150 200 250


Ch

arg

ed

Pa

rtic

le D

en

sity


Drell-Yan1.96 TeV

Charged Particles (|h|<1.0, PT>0.5 GeV/c)

PY Tune A

PY Tune AW

Z-bosonregion

Run 2 Drell-YanRun 2 Drell-Yan

Shows the charged particle density versus the lepton-pair invariant mass at 1.96 TeV for PYTHIA Tune AW and PYTHIA Tune A.

Shows the charged PTsum density versus the lepton-pair invariant mass at 1.96 TeV for PYTHIA Tune AW and PYTHIA Tune A.

<Densities> versus M(pair)

Charged PTsum Density: dPT/dhdf

0.0

0.4

0.8

1.2

1.6

0 50 100 150 200 250


Ch

arg

ed

PT

su

m D

en

sity

(G

eV/c

) RDF Preliminarygenerator level

Drell-Yan1.96 TeV Charged Particles (|h|<1.0, PT>0.5 GeV/c)

PY Tune A

PY Tune AW

The “Underlying Event”

Proton AntiProton




Anti-Lepton



High PHigh PTT Drell-Yan Drell-YanThe “Underlying Event” in High

PT Lepton-Pair Production

Proton AntiProton


PT(pair)

Lepton-Pair

Outgoing Parton




Lepton-Pair Direction

f

“Toward”

“Transverse” “Transverse”

“Away”

"Toward" Charged Particle Density: dN/dhdf

0.0

0.2

0.4

0.6

0.8

1.0

0 25 50 75 100 125 150

Lepton-Pair PT (GeV/c)

"To

wa

rd"

Ch

arg

ed D

ensi

ty



PY Tune A

PY Tune AW

70 < M(pair) < 110 GeV

Drell-Yan1.96 TeV

"Toward" PTsum Density: dPT/dhdf

0.0

0.4

0.8

1.2

1.6

0 25 50 75 100 125 150


"To

wa

rd"

PT

su

m D

ens

ity

(GeV

/c)


Charged Particles (|h|<1.0, PT>0.5 GeV/c) PY Tune A

PY Tune AW

70 < M(pair) < 110 GeV

Drell-Yan1.96 TeV

“Toward” <Densities> vs PT(pair)

70 < M(lepton-pair) < 110 GeV



High PHigh PTT Drell-Yan Drell-YanThe “Underlying Event” in High

PT Lepton-Pair Production

Proton AntiProton


PT(pair)

Lepton-Pair

Outgoing Parton





f

“Toward”


“Away”

“Transverse” <Densities> vs PT(pair)

"Transverse" Charged Particle Density: dN/dhdf

0.0

0.2

0.4

0.6

0.8

1.0

0 25 50 75 100 125 150


"Tra

ns

vers

e" C

ha

rged

De

nsi

ty RDF Preliminarygenerator level


PY Tune A

PY Tune AW

70 < M(pair) < 110 GeV

Drell-Yan1.96 TeV

"Transverse" PTsum Density: dPT/dhdf

0.0

0.4

0.8

1.2

1.6

0 25 50 75 100 125 150


"Tra

nsv

erse

" P

Tsu

m D

ensi

ty (

GeV

/c)



PY Tune A

PY Tune AW

70 < M(pair) < 110 GeV

Drell-Yan1.96 TeV




High PHigh PTT Drell-Yan Drell-YanThe “Underlying Event” in High PT Lepton-Pair Production

Proton AntiProton


PT(pair)

Lepton-Pair

Outgoing Parton





f

“Toward”


“Away”

“Toward” <Densities> vs “Transverse” <Densities>


0.0

0.4

0.8

1.2

1.6

0 25 50 75 100 125 150


"Tra

nsv

erse

" P

Tsu

m D

ensi

ty (

GeV

/c)



PY Tune A

PY Tune AW

70 < M(pair) < 110 GeV

Drell-Yan1.96 TeV


0.0

0.4

0.8

1.2

1.6

0 25 50 75 100 125 150


"To

wa

rd"

PT

su

m D

ens

ity

(GeV

/c)



PY Tune AW

70 < M(pair) < 110 GeV

Drell-Yan1.96 TeV




Z-bosonregion

High PHigh PTT Drell-Yan Drell-YanThe “Underlying Event” in Lepton-Pair Production


f

“Toward”


“Away”

“Toward” PTsum Density vs PT(pair)

Charged PTsum Density: dPT/dhdf

0.0

0.4

0.8

1.2

1.6

0 50 100 150 200 250


Ch

arg

ed

PT

su

m D

en

sity

(G

eV/c

) RDF Preliminarygenerator level

Drell-Yan1.96 TeV Charged Particles (|h|<1.0, PT>0.5 GeV/c)

PY Tune A

PY Tune AW


0.0

0.4

0.8

1.2

1.6

0 25 50 75 100 125 150


"To

wa

rd"

PT

su

m D

ens

ity

(GeV

/c)



PY Tune AW

70 < M(pair) < 110 GeV

Drell-Yan1.96 TeV

Overall PTsum Density vs M(pair)

Proton AntiProton




Anti-Lepton



High PHigh PTT Jets JetsThe “Underlying Event” in High

PT Jet Production

“Transverse” <Densities> vs PT(jet#1)


0.0

0.2

0.4

0.6

0.8

1.0

0 50 100 150 200 250 300 350 400 450 500

PT(particle jet#1) (GeV/c)

"Tra

nsv

erse

" C

har

ged

Den

sity

1.96 TeV



PY Tune A

"Leading Jet"

PY Tune AW

CTEQ5L


0.0

0.4

0.8

1.2

1.6

0 50 100 150 200 250 300 350 400 450 500


"Tra

nsv

erse

" P

Tsu

m D

ensi

ty (

GeV

/c)

1.96 TeV Charged Particles (|h|<1.0, PT>0.5 GeV/c)


"Leading Jet"

PY Tune A

PY Tune AW

CTEQ5L

Jet #1 Direction

f

“Toward”


“Away”

Proton AntiProton


PT(hard)

Outgoing Parton

Outgoing Parton






Drell-Yan vs JetsDrell-Yan vs JetsThe “Underlying Event” in High PT Lepton-Pair and Jet Production



0.0

0.4

0.8

1.2

1.6

0 50 100 150 200 250 300 350 400 450 500


"Tra

nsv

erse

" P

Tsu

m D

ensi

ty (

GeV

/c)



"Leading Jet"

PY Tune A

PY Tune AW

CTEQ5L

Jet #1 Direction

f

“Toward”


“Away”


0.0

0.4

0.8

1.2

1.6

0 25 50 75 100 125 150


"Tra

nsv

erse

" P

Tsu

m D

ensi

ty (

GeV

/c)



PY Tune A

PY Tune AW

70 < M(pair) < 110 GeV

Drell-Yan1.96 TeV

“Transverse” <Densities> vs PT(pair) Lepton-Pair

Direction f

“Toward”


“Away”



CTEQ6.1 TuneCTEQ6.1 TuneParameter Tune Q Tune QW

MSTP(81) 1 1

MSTP(82) 4 4


PARP(83) 0.5 0.5

PARP(84) 0.4 0.4

PARP(85) 0.9 0.9

PARP(86) 0.95 0.95


PARP(90) 0.25 0.25

PARP(62) 1.0 1.25

PARP(64) 1.0 0.2

PARP(67) 4.0 4.0

MSTP(91) 1 1

PARP(91) 1.0 2.1

PARP(93) 5.0 15.0

UE Parameters

ISR Parameters

Intrensic KT

PYTHIA 6.2 CTEQ6.1


0.0

0.2

0.4

0.6

0.8

1.0

0 50 100 150 200 250 300 350 400 450 500


"Tra

nsv

erse

" C

har

ged

Den

sity

1.96 TeV



PY Tune ACTEQ5L

"Leading Jet"

PY Tune QCTEQ61

PY Tune ACTEQ61


0.0

0.4

0.8

1.2

1.6

0 50 100 150 200 250 300 350 400 450 500


"Tra

nsv

erse

" P

Tsu

m D

ensi

ty (

GeV

/c)



"Leading Jet"

PY Tune ACTEQ5L

PY Tune QCTEQ61

PY Tune ACTEQ61

I used LHAPDF! See the next talk by Craig Group!



JIMMY at CDFJIMMY at CDFThe Energy in the “Underlying

Event” in High PT Jet Production


Jet #1 Direction

f

“Toward”


“Away”

Proton AntiProton


PT(hard)

Outgoing Parton

Outgoing Parton





0.0

0.4

0.8

1.2

1.6

0 50 100 150 200 250 300 350 400 450 500


"Tra

nsv

erse

" P

Tsu

m D

ensi

ty (

GeV

/c)

PY Tune A

HW

1.96 TeV


CDF Run 2 Preliminarygenerator level theory

MidPoint R = 0.7 |h(jet)| < 2

"Leading Jet"

JIMMY Default

JM325

"Transverse" ETsum Density: dET/dhdf

0.0

1.0

2.0

3.0

4.0

0 100 200 300 400 500


"Tra

nsv

erse

" E

Tsu

m D

ensi

ty (

Ge

V) 1.96 TeV

All Particles (|h|<1.0)

HW

PY Tune A

MidPoint R = 0.7 |h(jet)| < 2CDF Run 2 Preliminarygenerator level theory

"Leading Jet"

JIMMY Default

JM325

JIMMY: MPIJ. M. Butterworth

J. R. ForshawM. H. Seymour

JIMMY was tuned to fit the energy density in the “transverse” region for

“leading jet” events!

JIMMYRuns with HERWIG and adds multiple parton interactions!

PT(JIM)= 2.5 GeV/c.

PT(JIM)= 3.25 GeV/c.



JIMMY at CDFJIMMY at CDFThe “Underlying Event” in High

PT Jet Production


Jet #1 Direction

f

“Toward”


“Away”

Proton AntiProton


PT(hard)

Outgoing Parton

Outgoing Parton





0.0

0.4

0.8

1.2

0 50 100 150 200 250 300 350 400 450 500


"Tra

nsv

erse

" C

har

ged

Den

sity

1.96 TeV




PY Tune AHW

"Leading Jet"JIMMY Default JM325


0.0

0.4

0.8

1.2

1.6

0 50 100 150 200 250 300 350 400 450 500


"Tra

nsv

erse

" P

Tsu

m D

ensi

ty (

Ge

V/c

)

PY Tune A

HW

1.96 TeV




"Leading Jet"

JIMMY Default

JM325



SummarySummary

PYTHIA Tune Q works as well as Tune A but uses CTEQ6.1! At the Tevatron use Tune QW!

Default JIMMY (PTJIM = 2.5 GeV/c) does not fit the CDF “underlying event” data! Default JIMMY’s “underlying event” is much too active!

We are making good progress in understanding and modeling the “underlying event”. However, we do not yet have a perfect fit to all the features of the “underlying event”. PYTHIA Tune A does not produce enough energy in the “underlying event”! See my talk tomorrow!

PYTHIA Tune AW correctly describes the Z-boson PT distribution and also fits the “underlying event” as well as Tune A does! I do not see anything wrong with it, except that it may only work at the Tevatron. You can not trust the energy dependence!

Proton AntiProton




Anti-Lepton

Proton AntiProton


PT(hard)

Outgoing Parton

Outgoing Parton




JIMMY 325 (PTJIM = 3.25 GeV/c) fits the energy in the “underlying event” but does so by producing too many particles (i.e. it is too soft). See my talk tomorrow!

Good way to study the “underlying event”!

TeV4LHC Workshop

Documents

ptzcompares pythia tune

zboson pt distribution

leptonpair average pt

leptonpair invariant

high pt jet production

ptz distribution

high ptz

charged particle density