# CDF_2000_S4155203

CDF_2000_S4155203
=================

Z pT measurement in CDF Z -> e+ e- events

Status: VALIDATED

Spires ID: 4155203
Spires URL: http://www.slac.stanford.edu/spires/find/hep/www?rawcmd=key+4155203
Experiment: CDF Tevatron Run 1
Year of publication: 2000
Authors:
Hendrik Hoeth <hendrik.hoeth@cern.ch>

Description:
Measurement of transverse momentum and total cross section of e^+e^-
pairs in the Z-boson region of $66~\text{GeV}/c^2 < m_{ee} < 116~\text{GeV}/c^2$ from pbar-p collisions at sqrt(s) = 1.8 TeV, with the
Tevatron CDF detector.  The Z pT, in a fully-factorised picture, is
generated by the momentum balance against initial state radiation (ISR)
and the primordial/intrinsic pT of the Z's parent partons in the incoming
hadrons. The Z pT is important in generator tuning to fix the interplay
of ISR and multi-parton interactions (MPI) ingenerating underlying
event' activity.  This analysis is subject to ambiguities in the
experimental Z pT definition,since the Rivet implementation reconstructs
the Z momentum from the dileptonpair with finite cones for photon brem
the Z in the event record.

Run details:
ppbar collisions at 1800 GeV. $Z/\gamma*$ Drell-Yan events with e+ e-
decay mode only.

References:
Phys.Rev.Lett.84:845-850,2000
arXiv:hep-ex/0001021 - http://arxiv.org/abs/hep-ex/0001021
doi:10.1103/PhysRevLett.84.845 - http://dx.doi.org/10.1103/PhysRevLett.84.845


# CDF_2001_S4751469

CDF_2001_S4751469
=================

Field & Stuart Run I underlying event analysis.

Status: VALIDATED

Spires ID: 4751469
Spires URL: http://www.slac.stanford.edu/spires/find/hep/www?rawcmd=key+4751469
Experiment: CDF Tevatron Run 1
Year of publication: 2001
Authors:
Andy Buckley <andy.buckley@durham.ac.uk>

Description:
The original CDF underlying event analysis, based on decomposing each
event into a transverse structure with toward'', away'' and
transverse'' regions defined relative to the azimuthal direction of the
leading jet in the event. Since the toward region is by definition
dominated by the hard process, as is the away region by momentum balance
in the matrix element, the transverse region is most sensitive to multi-
parton interactions. The transverse regions occupy $|\phi| \in [60\degree, 120\degree]$ for $|\eta| < 1$. The pT ranges for the leading
jet are divided experimentally into the min-bias' sample from 0--20 GeV,
and the JET20' sample from 18--49 GeV.

Run details:
ppbar QCD interactions at 1800 GeV. The leading jet is binned from 0--49
GeV, and histos can usually can be filled with a single generator run
without kinematic sub-samples.

References:
Phys.Rev.D65:092002,2002
FNAL-PUB 01/211-E


# CDF_2002_S4796047

CDF_2002_S4796047
=================

CDF Run 1 charged multiplicity measurement

Status: VALIDATED

Spires ID: 4796047
Spires URL: http://www.slac.stanford.edu/spires/find/hep/www?rawcmd=key+4796047
Experiment: CDF Tevatron Run 1
Year of publication: 2002
Authors:
Hendrik Hoeth <hendrik.hoeth@cern.ch>

Description:
A study of ppbar collisions at sqrt(s) = 1800 and 630 GeV collected using
a minimum bias trigger in which the data set is divided into two classes
corresponding to soft' and hard' interactions. For each subsample, the
analysis includes measurements of the multiplicity, transverse momentum
(pT) spectra, and the average pT and event-by- event pT dispersion as a
function of multiplicity. A comparison of results shows distinct
differences in the behavior of the two samples as a function of the
center of mass energy. The properties of the soft sample are invariant as
a function of c.m. energy.

Run details:
QCD events at sqrt(s) = 630 and 1800 GeV.

References:
Phys.Rev.D65:072005,2002
doi:10.1103/PhysRevD.65.072005 - http://dx.doi.org/10.1103/PhysRevD.65.072005


# CDF_2004_S5839831

CDF_2004_S5839831
=================

Transverse cone and 'Swiss cheese' underlying event studies

Status: UNVALIDATED

Spires ID: 5839831
Spires URL: http://www.slac.stanford.edu/spires/find/hep/www?rawcmd=key+5839831
Experiment: CDF Tevatron Run 2
Year of publication: 2004
Authors:
Andy Buckley <andy.buckley@durham.ac.uk>

Description:
This analysis studies the underlying event via transverse cones of  $R = 0.7$ at 90 degrees in \phi relative to the leading (highest E) jet, at
sqrt(s) = 630 and 1800 GeV. This is similar to the 2001 CDF UE analysis,
except that cones, rather than the whole central \eta range are used. The
transverse cones are categorised as TransMIN and TransMAX on an event-by-
event basis, to give greater sensitivity to the UE component. 'Swiss
Cheese' distributions, where cones around the leading $n$ jets are
excluded from the distributions, are also included for $n = 2, 3$.  This
analysis is useful for constraining the energy evolution of the
underlying event, since it performs the same analyses at two distinct CoM
energies. WARNING, the Swiss Cheese plots are not considered validated,
as we have not yet been able to reproduce the MC curves shown in the
paper.

Run details:
QCD events at sqrt(s) = 630 & 1800 GeV Several pTmin cutoffs are probably
required to fill the profile histograms, e.g. 0 (min bias), 30, 90, 150
GeV  at 1800 GeV; and 0 (min bias), 20, 90,  150 GeV } at 630 GeV

References:
Phys. Rev. D70, 072002 (2004)
arXiv:hep-ex/0404004 - http://arxiv.org/abs/hep-ex/0404004


CDF_2008_LEADINGJETS
====================

CDF Run 2 underlying event in leading jet events

Status: VALIDATED

Spires ID: NONE
Spires URL: http://www.slac.stanford.edu/spires/find/hep/www?rawcmd=key+NONE
Experiment: CDF Tevatron Run 2
Year of publication: 2008
Authors:
Hendrik Hoeth <hendrik.hoeth@cern.ch>

Description:
Rick Field's measurement of the underlying event in leading jet events.
If the leading jet of the event is within $|\eta| < 2$, the event is
accepted and toward'', away'' and transverse'' regions are defined
in the same way as in the original (2001) CDF underlying event analysis.
The leading jet defines the $\phi$ direction of the toward region. The
transverse regions are most sensitive to the underlying event.

Run details:
ppbar QCD interactions at 1960 GeV. Particles with  $c \tau > {}$10 mm
should be set stable. Several $p_\perp^\text{min}$  cutoffs are
probably required to fill the profile histograms. $p_\perp^\text{min} = {}$ 0 (min bias), 10, 20, 50, 100, 150 GeV. The corresponding merging
points are at $p_T =$ 0, 30, 50, 80,  130, 180 GeV


# CDF_2008_NOTE_9351

CDF_2008_NOTE_9351
==================

CDF Run 2 underlying event in Drell-Yan

Status: VALIDATED

Spires ID: NONE
Spires URL: http://www.slac.stanford.edu/spires/find/hep/www?rawcmd=key+NONE
Experiment: CDF Tevatron Run 2
Year of publication: 2008
Authors:
Hendrik Hoeth <hendrik.hoeth@cern.ch>

Description:
Deepak Kar and Rick Field's measurement of the underlying event in Drell-
Yan events. Z -> ee and Z -> $\mu\mu$ events are selected using a Z mass
window cut between 70 and 110 GeV. Toward'', away'' and
transverse'' regions are defined in the same way as in the original
(2001) CDF underlying event analysis. The reconstructed Z defines the
$\phi$ direction of the toward region. The leptons are ignored after the
Z has been reconstructed. Thus the region most sensitive to the
underlying event is the toward region (the recoil jet is boosted into the
away region).

Run details:
* ppbar collisions at 1960 GeV. * Drell-Yan events with $Z/\gamma* -> e e$ and $Z/\gamma* -> \mu\mu$. * A mass cut $m_{ll} > 70~\text{GeV}$ can
be applied on generator level. * Particles with $c \tau > 10~\text{mm}$
should be set stable.

References:
CDF public note 9351


# D0_2004_S5992206

D0_2004_S5992206
================

Run II jet azimuthal decorrelation analysis

Status: VALIDATED

Spires ID: 5992206
Spires URL: http://www.slac.stanford.edu/spires/find/hep/www?rawcmd=key+5992206
Experiment: D0 Tevatron Run 2
Year of publication: 2004
Authors:
Lars Sonnenschein <lars.sonnenschein@cern.ch>

Description:
Correlations in the azimuthal angle between the two largest pT jets have
been measured using the D0 detector in ppbar collisions at 1960 GeV. The
analysis is based on an inclusive dijet event sample in the central
rapidity region. The correlations are determined for four different pT
intervals.

Run details:
QCD events in ppbar interactions at sqrt(s) = 1960 GeV.

References:
Phys. Rev. Lett., 94, 221801 (2005)
arXiv:hep-ex/0409040 - http://arxiv.org/abs/hep-ex/0409040
`