rick field university of florida

LPCC MB&UE Meeting CERN June 17, 2011

Rick Field – Florida/CDF/CMS

Rick FieldUniversity of Florida

UE&MB@CMSUE&MB@CMS

MB&UE Working Group Meeting

CMS

ATLAS

Some PYTHIA LHC Tunes

Outline of Talk

June 17, 2011

LHC PYTHIA Tunes: Rick’s PYTHIA 6.4 tunes (Z1, Z2), Peter’s PYTHIA 6.4 Perugia 2011 tunes (S350, S356), and PYTHIA 8 Tune 4C (Corke & Sjöstrand).

Baryon and Strange Particle Production at the LHC: Fragmentation tuning.

K+

u s K-

u s

Kshort

d s s d +

p

u u d

u d s

d s s



PYTHIA 6.4.25PYTHIA 6.4.25 --------------------------------------------------------------------- 4th generation: tunes incorporating 7-TeV data --------------------------------------------------------------------- 340 AMBT1 : 1st ATLAS tune incl 7 TeV, w. LO* PDFs (2010) 341 Z1 : Retune of AMBT1 by Field w CTEQ5L PDFs (2010) 342 Z1-LEP : Retune of Z1 by Skands w CTEQ5L PDFs (2010) 343 Z2 : Retune of Z1 by Field w CTEQ6L1 PDFs (2010) 344 Z2-LEP : Retune of Z1 by Skands w CTEQ6L1 PDFs (2010) 350 Perugia 2011 : Retune of Perugia 2010 incl 7-TeV data (Mar 2011) 351 P2011 radHi : Variation with alphaS(pT/2) 352 P2011 radLo : Variation with alphaS(2pT) 353 P2011 mpiHi : Variation with more semi-hard MPI 354 P2011 noCR : Variation without color reconnections 355 P2011 LO** : Perugia 2011 using MSTW LO** PDFs (Mar 2011) 356 P2011 C6 : Perugia 2011 using CTEQ6L1 PDFs (Mar 2011) 357 P2011 T16 : Variation with PARP(90)=0.16 away from 7 TeV 358 P2011 T32 : Variation with PARP(90)=0.32 awat from 7 TeV 359 P2011 TeV : Perugia 2011 optimized for Tevatron (Mar 2011) 360 S Global : Schulz-Skands Global fit (Mar 2011) 361 S 7000 : Schulz-Skands at 7000 GeV (Mar 2011) 362 S 1960 : Schulz-Skands at 1960 GeV (Mar 2011) 363 S 1800 : Schulz-Skands at 1800 GeV (Mar 2011) 364 S 900 : Schulz-Skands at 900 GeV (Mar 2011) 365 S 630 : Schulz-Skands at 630 GeV (Mar 2011) =========================================================

Tune Z1

Tune Z2

Tune S350

Tune S356

PYTUNE

CTEQ5L

CTEQ6L

CTEQ5L

CTEQ6L



Min-Bias CollisionsMin-Bias Collisions

CMS NSD data on the charged particle rapidity distribution at 7 TeV compared with PYTHIA Tune Z1. The plot shows the average number of particles per NSD collision per unit , (1/NNSD) dN/d.

CMS

Proton Proton

“Minimum Bias” Collisions

Okay not perfect, but remember we know that SD and DD are not modeled well!

Charged Particle Density: dN/d

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Pseudo-Rapidity

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pyZ1 NSD = solid

CMS DataPYTHIA Tune Z1

NSD (all pT) 7 TeV

ALICE NSD data on the charged particle rapidity distribution at 900 GeV compared with PYTHIA Tune Z1. The plot shows the average number of particles per INEL collision per unit , (1/NINEL) dN/d.

Tune Z1


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pyZ1 NSD = dashed

pyZ1 INEL = solid

ALICE DataPYTHIA Tune Z1

INEL (all pT) 900 GeV

Tune Z1

ALICE

NSD = ND + DD

INEL = NSD + SD



MB versus UEMB versus UE

CMS NSD data on the charged particle rapidity distribution at 7 TeV compared with PYTHIA Tune Z1. The plot shows the average number of charged particles per NSD collision per unit , (1/NNSD) dN/d.

CMS

Proton Proton



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pyZ1 NSD = solid


NSD (all pT) 7 TeV

Tune Z1

NSD = ND + DD

CMS NSD data on the charged particle rapidity distribution at 7 TeV compared with PYTHIA Tune Z1. The plot shows the average number of charged particles per NSD collision per unit , (1/NNSD) dN/dd.

Charged Particle Density: dN/dd

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NSD (all pT) 7 TeV

Divide be 2




Proton Proton


CMSTune Z1 NSD = ND + DD



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NSD (all pT) 7 TeV

Transverse Charged Particle Density: dN/dd

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7 TeV ND

Charged Particles (|| < 2, all pT)

RDF PreliminaryPYTHIA Tune Z1

Proton Proton

PT(hard)

Outgoing Parton

Outgoing Parton

Underlying Event Underlying Event

Initial-State Radiation

Final-State Radiation

Shows the density of charged particles in the “transverse” region as a function of PTmax for charged particles (All pT, || < 2) at 7 TeV from PYTHIA Tune Z1.

Tune Z1

Factor of 2!




Proton Proton





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pyZ1 NSD = solid


NSD (all pT) 7 TeV

Proton Proton

PT(hard)

Outgoing Parton

Outgoing Parton




ATLAS data on the density of charged particles in the “transverse” region as a function of PTmax for charged particles (pT > 0.1 GeV/c, || < 2.5) at 7 TeV compared with PYTHIA Tune Z1.

Factor of 2!

"Transverse" Charged Particle Density: dN/dd

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PTmax (GeV/c)

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nsv

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RDF PreliminaryATLAS corrected data

Tune Z1 generator level

7 TeV Charged Particles (pT > 0.1 GeV/c, ||<2.5)

ATLAS



Baryon & Strange Particle Baryon & Strange Particle Production at the LHCProduction at the LHC

Strange Particle Production in Proton-Proton Collisions at 900 GeV with ALICE at the LHC, arXiv:1012.3257 [hep-ex] December 18, 2010.

Production of Pions, Kaons and Protons in pp Collisions at 900 GeV with ALICE at the LHC, arXiv:1101.4110 [hep-ex] January 25, 2011.

Strange Particle Production in pp Collisions at 900 GeV and 7 TeV, CMS Paper: arXiv:1102.4282 [hep-ex] Feb 21, 2011, submitted to JHEP.

Step 1: Look at the overall particle yields (all pT). K+

u s

K-

u s

Kshort

d s s d +

p

u u d

u d s

d s s

Step 2: Look at the ratios of the overall particle yields (all pT).

Step 3: Look at the pT dependence of the particle yields and ratios.

I know there are more nice results

from the LHC, but this is all I can show

today. Sorry!

INEL

INEL

NSD



Kaon ProductionKaon Production

CMS NSD data on the Kshort rapidity distribution at 7 TeV and 900 GeV compared with PYTHIA Tune Z1. The plot shows the average number of Kshort per NSD collision per unit Y, (1/NNSD) dN/dY.

Kshort Rapidity Distribution: dN/dY

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NSD (all pT) Tune Z1

CMS


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Rapidity Y

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/dY 900 GeV

CMS & ALICE DataPYTHIA Tune Z1

CMS NSD

ALICE INEL pyZ1 NSD = solid

pyZ1 INEL = dashed

CMS NSD data on the Kshort rapidity distribution at 900 GeV and the ALICE point at Y = 0 (INEL) compared with PYTHIA Tune Z1. The ALICE point is the average number of Kshort per INEL collision per unit Y at Y = 0, (1/NINEL) dN/dY.

Tune Z1

INEL = NSD + SD

Proton Proton


No overall shortage of Kaons in PYTHIA Tune Z1!


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/dY

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NSD (all pT) pyZ1 = solid

pyS350 = dashed

CMS DataPYTHIA Tune Z1 & S350




Rick’s plot of the CMS NSD data on the Kshort rapidity distribution at 7 TeV and 900 GeV. The plot shows the average number of Kshort per NSD collision per unit Y, (1/NNSD) dN/dY, versus Y from -2 → 2.

CMS measures (1/NNSD) dN/dY

Real CMS NSD data on the Kshort rapidity distribution at 7 TeV and 900 GeV. The plot shows the average number of Kshort per NSD collision per unit Y, (1/NNSD) dN/dY, versus |Y| from 0 → 2.


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Rapidity Y

dN

/dY


900 GeV

7 TeV

NSD (all pT)

versus |Y| from 0 → 2

I am old and I like to see both sides so I assumed symmetry about Y = 0 and plotted the same data on both sides (Y → -Y). The way CMS does it is the correct way! But my way helps me see better what is going on. Please refer to the CMS publication for the official plots!

Warning: I am not plotting what CMS actually measures!

This is the correct way!

I have plotted the same data twice!




ALICE INEL data on the charged kaon rapidity distribution at 900 GeV compared with PYTHIA Tune Z1. The plot shows the average number of charged kaons per INEL collision per unit Y at Y = 0, (1/NINEL) dN/dY.

Proton Proton


Charged Kaons Rapidity: dN/dY

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INEL (all pT) 900 GeVpyZ1 NSD = dashed

pyZ1 INEL = solid

(K++K-)

Rapidity Distribution Ratio: Kaons/Pions

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(K++K-)/(++-)

ALICE INEL data on the charged kaon to charged pion rapidity ratio at 900 GeV compared with PYTHIA Tune Z1.

ALICE ALICE

Tune Z1 Tune Z1

Rapidity Distribution Ratio: Kshort/Kaons

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Kshort/(K++K-)

No overall shortage of Kaons in PYTHIA Tune Z1!


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ALICE DataPYTHIA Tune Z1 & S350


(K++K-)/(++-)

pyZ1 = solid

pyS350 = dashed



LEP: KLEP: Kshortshort Spectrum Spectrum

S350 Perugia 2011

Theory/Data



Lambda ProductionLambda Production

CMS NSD data on the Lambda+AntiLambda rapidity distribution at 7 TeV and 900 GeV compared with PYTHIA Tune Z1. The plot shows the average number of particles per NSD collision per unit Y, (1/NNSD) dN/dY.

Proton Proton


(Lam+LamBar) Rapidity Distribution: dN/dY

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Rapidity Y

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/dY


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7 TeV

NSD (all pT)

(+)_

Rapidity Distribution Ratio: (Lam+LamBar)/(2Kshort)

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7 TeV

NSD (all pT)

(+)/(2Kshort)_

CMS Tune Z1

CMS NSD data on the Lambda+AntiLambda to 2Kshort rapidity ratio at 7 TeV compared with PYTHIA Tune Z1.

CMS

Tune Z1

Factor of 1.5!

Oops! Not enough Lambda’s in PYTHIA Tune Z1!


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NSD (all pT)

(+)_

pyZ1 = solid

pyS350 = dashed



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(+)/(2Kshort)_

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LEP: LEP: Spectrum Spectrum

S350 Perugia 2011

Theory/Data



Cascade ProductionCascade Production

CMS NSD data on the Cascade-+AntiCascade- rapidity distribution at 7 TeV and 900 GeV compared with PYTHIA Tune Z1. The plot shows the average number of particles per NSD collision per unit Y, (1/NNSD) dN/dY.

Proton Proton


(Cas+CasBar) Rapidity Distribution: dN/dY

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Rapidity Y

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/dY


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NSD (all pT)

(+

)_

Rapidity Distribution Ratio: (Cas+CasBar)/(2Kshort)

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7 TeV

NSD (all pT)

(+

)/(2Kshort)_

CMS

Tune Z1

CMS data on the Cascade-+AntiCascade- to 2Kshort rapidity ratio at 7 TeV compared with PYTHIA Tune Z1.

CMS

Tune Z1

Factor of 2!

Yikes! Way too few Cascade’s in PYTHIA Tune Z1!


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Rapidity Y

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NSD (all pT)

(+

)_

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(+

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LEP: LEP: Spectrum Spectrum

S350 Perugia 2011

Theory/Data



PYTHIA Fragmentation PYTHIA Fragmentation ParametersParameters

PARJ(1) : (D = 0.10) is P(qq)/P(q), the suppression of diquark-antidiquark pair production in the colour field, compared with quark–antiquark production. Notation: PARJ(1) = qq/q

PARJ(2) : (D = 0.30) is P(s)/P(u), the suppression of s quark pair production in the field compared with u or d pair production. Notation: PARJ(2) = s/u.

PARJ(3) : (D = 0.4) is (P(us)/P(ud))/(P(s)/P(u)), the extra suppression of strange diquark production compared with the normal suppression of strange quarks. Notation: PARJ(3) = us/u .

Can we increase the overall rate of strange baryons by varying a few fragmentation parameters? For now ignore e+e-!

This work is in progress!

Warning! This may cause problemsfitting the LEP data. If sowe must understand why!

We do not want one tune for e+e- and another one for

hadron-hadron collisions!



PYTHIA Fragmentation PYTHIA Fragmentation ParametersParameters

PYTHIA Tune Z1C: Same as Tune Z1 except qq/q is increased 0.1 → 0.12 and us/s is increased from 0.4 → 0.8.


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7 TeVNSD (all pT) s/u: 0.3 -> 0.5

us/s: 0.4 -> 1.0

qq/q: 0.1 -> 0.2

Z1 default

(+)/(2Kshort)_


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7 TeVNSD (all pT)

s/u: 0.3 -> 0.5

us/s: 0.4 -> 1.0qq/q: 0.1 -> 0.2

Z1 default

(+

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(K++K-)/(++-)s/u: 0.3 -> 0.5

us/s: 0.4 -> 1.0

qq/q: 0.1 -> 0.2Z1 default




CMS NSD data on the Kshort rapidity distribution at 7 TeV and 900 GeV compared with PYTHIA Tune Z1. The plot shows the average number of Kshort per NSD collision per unit Y, (1/NNSD) dN/dY.


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NSD (all pT) Tune Z1CMS


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CMS DataPYTHIA Tune Z1C

900 GeV

7 TeV

NSD (all pT)

Tune Z1Cqq/q: 0.1 -> 0.12us/s: 0.4 -> 0.8

CMS dNSD ata on the Kshort rapidity distribution at 7 TeV and 900 GeV compared with PYTHIA Tune Z1C. The plot shows the average number of Kshort per NSD collision per unit Y, (1/NNSD) dN/dY.

Tune Z1CCMS


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ALICE DataPYTHIA Tune Z1 & Z1C


(K++K-)/(++-)

Z1

Z1C

Tune Z1Cqq/q: 0.1 -> 0.12us/s: 0.4 -> 0.8

Proton Proton


For Kaon production Tune Z1 and Z1C are almost identical!



Lambda ProductionLambda Production



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(+)_


CMS Tune Z1

CMS

Tune Z1C


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CMS DataPYTHIA Tune Z1 & Z1C

7 TeV

NSD (all pT)

(+)/(2Kshort)_

Z1

Z1C

Tune Z1Cqq/q: 0.1 -> 0.12us/s: 0.4 -> 0.8

Proton Proton


Not bad! Many more Lambda’s in PYTHIA Tune Z1C!



Cascade ProductionCascade Production



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CMS

Tune Z1

CMS

Tune Z1C


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(+

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Rapidity Ratio: (Cas+CasBar)/(Lam+LamBar)

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Tune Z1Cqq/q: 0.1 -> 0.12us/s: 0.4 -> 0.8

(+

)/(+)_ _

Proton Proton


Wow! PYTHIA Tune Z1C looks very nice here!



Transverse Momentum Transverse Momentum DistributionsDistributions

CMS NSD data on the Kshort transverse momentum distribution at 7 TeV compared with PYTHIA Tune Z1 & Z1C. The plot shows the average number of particles per NSD collision per unit pT, (1/NNSD) dN/dpT for |Y| < 2.

PT Distribution: Kshort

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dN

/dP

T (

1/G

eV/c

)


NSD (|Y| < 2)) Z1

Z1C

Tune Z1Cqq/q: 0.1 -> 0.12us/s: 0.4 -> 0.8

7 TeV

PT Distribution: Lam+LamBar

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dN

/dP

T (

GeV

/c)


NSD (|Y| < 2))

Z1

Z1C

Tune Z1Cqq/q: 0.1 -> 0.12us/s: 0.4 -> 0.8

7 TeV

(+)_

CMS NSD data on the Lambda+AntiLambda transverse momentum distribution at 7 TeV compared with PYTHIA Tune Z1 & Z1C. The plot shows the average number of particles per NSD collision per unit pT, (1/NNSD) dN/dpT for |Y| < 2.

Proton Proton


PYTHIA Tune Z1 & Z1C are a bit off on the pT dependence!



Transverse Momentum Transverse Momentum DistributionsDistributions

PT Distribution: Cas+CasBar

1.0E-04

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0 1 2 3 4 5 6 7

PT (GeV/c)

dN

/dP

T (

1/G

eV/c

)


NSD (|Y| < 2))

Z1

Z1C

Tune Z1Cqq/q: 0.1 -> 0.12us/s: 0.4 -> 0.8

7 TeV

(+

)_

Cas+CasBar PT Distribution: dN/dPT

1.0E-03

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1.0E+00

0 1 2 3 4 5 6 7

PT (GeV/c)

Pro

ba

bil

ity


NSD (|Y| < 2))

Z1

Z1C

Tune Z1Cqq/q: 0.1 -> 0.12us/s: 0.4 -> 0.8

7 TeV

(+

)_

Normalized to 1

CMS NSD data on the Cascade-+AntiCascade- transverse momentum distribution at 7 TeV compared with PYTHIA Tune Z1 & Z1C. The plot shows the average number of particles per NSD collision per unit pT, (1/NNSD) dN/dpT for |Y| < 2.

CMS NSD data on the Cascade-+AntiCascade- transverse momentum distribution at 7 TeV (normalized to 1) compared with PYTHIA Tune Z1 & Z1C.

Proton Proton


PYTHIA Tune Z1 & Z1C are a bit off on the pT dependence!



Particle Ratios versus PTParticle Ratios versus PT

Proton Proton


PT Particle Ratio: (Lam+LamBar)/(2Kshort)

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CMS NSD data on the Lambda+AntiLambda to 2Kshort ratio versus pT at 7 TeV (|Y| < 2) compared with PYTHIA Tune Z1 & Z1C.

ALICE INEL data on the Lambda+AntiLambda to 2Kshort ratio versus pT at 900 GeV (|Y| < 0.75) compared with PYTHIA Tune Z1 & Z1C.

Tune Z1C is not too bad but a bit off on the pT dependence!




Proton Proton


PT Particle Ratio: (Cas+CasBar)/(2Kshort)

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CMS DataPYTHIA Tune Z1 & Z1C (

+

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CMS NSD data on the Cascade-+AntiCascade- to 2Kshort ratio versus pT at 7 TeV (|Y| < 2) compared with PYTHIA Tune Z1 & Z1C.

CMS NSD data on the Cascade-+AntiCascade- to Lambda+AntiLambda ratio versus pT at 7 TeV (|Y| < 2) compared with PYTHIA Tune Z1 & Z1C.

Tune Z1C is not too bad but a bit off on the pT dependence!




Proton Proton


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PYTHIA Tune Z1 & Z1C

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ALICE INEL data on the charged kaon to charged pion rapidity ratio at 900 GeV compared with PYTHIA Tune Z1.

ALICE INEL data on the charged kaons to charged pions ratio versus pT at 900 GeV (|Y| < 0.75) compared with PYTHIA Tune Z1 & Z1C.

Tune Z1C is not too bad but a way off on the pT dependence!

Tails of the pT distribution. Way off due to the wrong pT!




Proton Proton


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ALICE INEL data on the Proton+AntiProton to charged pions ratio versus pT at 900 GeV (|Y| < 0.75) compared with PYTHIA Tune Z1 & Z1C.

ALICE INEL data on the Proton+AntiProton to charged pion rapidity ratio at 900 GeV compared with PYTHIA Tune Z1 & Z1C.

Tune Z1C is not too bad but way off on the pT dependence!

Tails of the pT distribution. Way off due to the wrong pT!

Rapidity Distribution Ratio: (P+Pbar)/Pions

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INEL (all pT)

pyZ1 = solid

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LEP: Proton SpectrumLEP: Proton Spectrum

S350 Perugia 2011

Theory/Data




Proton Proton





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Shows the density of particles in the “transverse” region as a function of PTmax for charged particles (All pT, || < 2) at 7 TeV from PYTHIA Tune Z1.

Log Scale!




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Shows the density of Kshort particles in the “transverse” region as a function of PTmax for charged particles (All pT, || < 2) at 7 TeV from PYTHIA Tune Z1.

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Shows the density of P+antiP particles in the “transverse” region as a function of PTmax for charged particles (All pT, || < 2) at 7 TeV from PYTHIA Tune Z1.

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Shows the +anti pseudo-rapidity distribution (all pT) at 7 TeV from PYTHIA Tune Z1. The plot shows the average number of particles per ND collision per unit , (1/NND) dN/dd.

Proton Proton

PT(hard)

Outgoing Parton

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Shows the density of +anti particles in the “transverse” region as a function of PTmax for charged particles (All pT, || < 2) at 7 TeV from PYTHIA Tune Z1.

Tune Z1

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Proton Proton

PT(hard)

Outgoing Parton

Outgoing Parton




Shows the density of +anti particles in the “transverse” region as a function of PTmax for charged particles (All pT, || < 2) at 7 TeV from PYTHIA Tune Z1.

Tune Z1

Factor of ~2!

Coming soon! Measurements from CMS,ATLAS, and ALICE on the strange

particles and baryons in the “underlying event”.



Fragmentation SummaryFragmentation Summary Not too hard to get the overall yields of

baryons and strange particles roughly right at 900 GeV and 7 TeV. Tune Z1C does a fairly good job with the overall particle yields at 900 GeV and 7 TeV.

PT Distributions: PYTHIA does not describe correctly the pT distributions of heavy particles (MC softer than the data). None of the fragmentation parameters I have looked at changes the pT distributions. Hence, if one looks at particle ratios at large pT you can see big discrepancies between data and MC (out in the tails of the distributions)!

ATLAS Tuning Effort: Fragmentation flavor tuning at the one of the four stages.

Proton Proton


K+

u s

K-

u s

Kshort

d s s d + p

u u d

u d s

d s s

Other Fragmentation Tuning: There is additional tuning involving jet shapes, FSR, and ISR that I did not have time to include in this talk.

Warning! The Tune Z1C fragmentationparameters may cause problems

fitting the LEP data. If sowe must understand why!

We do not want one tune for e+e- and another one for

hadron-hadron collisions!

rick field university of florida

Documents

pythia tune z1

p2011 tev

tev data

tunes z1

nsd collision

lhc pythia tunes

uecms nsd data

alice nsd data