Field-Stuart-Haas PRD

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Field-Stuart-Haas PRD. Charged Particle Data. QCD Monte-Carlo. WYSIWYG What you see is what you get. Almost!. Zero or one vertex |z c -z v | < 2 cm, |CTC d 0 | < 1 cm Require P T > 0.5 GeV, | h | < 1 Assume a uniform track finding efficiency of 92\%

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Presentation Transcript
Field-Stuart-HaasPRD

Charged Particle

Data

QCD

Monte-Carlo

WYSIWYG

What you see is

what you get.

Almost!

• Zero or one vertex
• |zc-zv| < 2 cm, |CTC d0| < 1 cm
• Require PT > 0.5 GeV, |h| < 1
• Assume a uniform track finding efficiency of 92%
• Errors include both statistical and correlated systematic uncertainties

Select

“clean”

region

Make

efficiency

corrections

Look only at the charged particles measured by the CTC.

• Require PT > 0.5 GeV, |h| < 1
• Make an 8% correction for the track finding efficiency
• Errors (statistical plus systematic) of around 5%

compare

Small

Corrections!

Corrected theory

Uncorrected data

Rick Field

Charged Particle DfCorrelations
• Look at charged particle correlations in the azimuthal angle Df relative to the leading charged particle jet.
• Define |Df| < 60o as “Toward”, 60o < |Df| < 120o as “Transverse”, and |Df| > 120o as “Away”.
• All three regions have the same size in h-f space, DhxDf = 2x120o = 4p/3.

Rick Field

Charged Multiplicity versus PT(chgjet#1)
• Data on the average number of “toward” (|Df|<60o), “transverse” (60<|Df|<120o), and “away” (|Df|>120o) charged particles (PT > 0.5 GeV, |h| < 1, including jet#1) as a function of the transverse momentum of the leading charged particle jet. Each point corresponds to the in a 1 GeV bin. The solid (open) points are the Min-Bias (JET20) data. The errors on the (uncorrected) data include both statistical and correlated systematic uncertainties.

Underlying Event

“plateau”

Blessed on 11/3/99

Rick Field

“Transverse” Nchg versus PT(chgjet#1)
• Plot shows the “Transverse” versus PT(chgjet#1) compared to the the QCD hard scattering predictions of Herwig 5.9, Isajet 7.32, and Pythia 6.115 (default parameters with PT(hard)>3 GeV/c).
• Only charged particles with |h| < 1 and PT > 0.5 GeV are included and the QCD Monte-Carlo predictions have been corrected for efficiency.

Isajet 7.32

Pythia 6.115

Herwig 5.9

Blessed on 11/3/99

Rick Field

“Transverse” Nchg versus PT(chgjet#1)
• Plot shows the PT distribution of the “Transverse” .Each point corresponds to the d/dPT in a 1 GeV bin.
• The triangle and circle (square) points are the Min-Bias (JET20) data. The errors on the (uncorrected) data include both statistical and correlated systematic uncertainties.

To be blessed

Rick Field

“Transverse” Nchg versus PT(chgjet#1)
• Plot shows the data on the PT distribution of the “Transverse” for PT(chgjet#1) > 2 GeV/c compared with the QCD hard scattering prediction of HERWIG.
• The dashed (solid) curves show the contribution arising from the beam-beam remnants (total).

Theory Curves

Rick Field

“Transverse” Nchg versus PT(chgjet#1)
• Plot shows the data on the PT distribution of the “Transverse” for PT(chgjet#1) > 30 GeV/c compared with the QCD hard scattering prediction of HERWIG.
• The dashed (solid) curves show the contribution arising from the beam-beam remnants (total).

Theory Curves

Rick Field

“Transverse” Nchg versus PT(chgjet#1)
• Plot shows the data on the PT distribution of the “Transverse” for PT(chgjet#1) > 30 GeV/c compared with the QCD hard scattering prediction of HERWIG, ISAJET, and PYTHIA 6.115.

Theory Curves

Rick Field