| Jets | |
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MidPoint Inclusive Jet Production Cross Section based on 1.04 fb^-1 of CDF Run II Data.
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March 2006
PRL submit (385pb^-1)
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We present preliminary results on inclusive jet production using the
longitudinally invariant Kt algorithm (Ellis-Soper inclusive mode) for
jets in the region 0.1 < |Y| < 0.7 and P_T > 54 GeV/c. Results are based
on 385 pb^-1 of CDF II data. Measurements are corrected to the hadron
level and compared to pQCD NLO calculations as implemented in JETRAD including
parton-to-hadron corrections.
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April 2005
PRL submit
Look for new results soon!
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We present a study of the inclusive jet production cross section using the
longitudinally invariant K_T algorithm (Ellis-Soper inclusive mode) for
jets with P_T = 54 GeV/c in four different jet rapidity regions:
|Y| < 0.1, 0.7 < |Y| < 1.1, 1.1 < |Y| < 1.6 and 1.6 < |Y| < 2.1. Results are
based on 385 pb^-1 of CDF Run II data and complement previous measurements in
the region 0.1 < |Y| < 0.7. Measurements are fully unfolded to the hadron level.
The data is compared to pQCD NLO calculations as determined using JETRAD. The
theoretical predictions are corrected for underlying event and hadronization.
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August 2005
Look for new results soon!
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This analysis presents first preliminary results on jet shapes and
energy flows in inclusive dijet production based on
170 pb^-1 of Run II data. Jets are searched for using
the midpoint algorithm with radius R = 0.7. Jet shapes are determined
using calorimeter towers and corrected to the hadron level. The measurements
are compared to leading-order QCD Monte Carlo predictions.
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April 2004
PRD 71, 112002 (2005)
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W+jets differential cross section with 320pb^-1: We measure the differential cross section for W production in association with at least n jets as a function of jet E_T, jet-jet delta R, and jet-jet invariant mass.
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February 2006
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| Dijet mass | |
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Search for the W/Z Hadronic Decays in Photon Events
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Search for the W/Z Hadronic Decays in Photon Events
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June 2005 |
| Heavy Flavor Jets | |
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Results for the measurement of the inclusive b-jet cross section in RunII,
based on 300 pb^-1 of good run data collected from February 2002 to
September 2004, are presented. The analysis is performed on jets within the
central rapidity region (|y|<0.7); jets are reconstructed using the MidPoint
cone-based algorithm, in a Pt range of 38 GeV to 400 GeV/c (corrected transverse momentum)
and exploits the good tracking capabilities of the CDF detector to tag
b-jets by reconstructing secondary vertex with the SecVtx algorithm.
A preliminary comparison with Next-to-Leading Order prediction is also presented.
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April 2005 (NLO comparison Sept 2005) |
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We measure the inclusive bb jet production cross section by requiring
two secondary vertex tagged jets within |eta|< 1.2. One of these tagged
jets has to have a corrected transverse energy greater than 30 GeV, the
other has to have a corrected transverse energy greater than 20 GeV. We
use the 2D SECVTX algorithm to tag heavy flavour jets and use a fitting
technique to determine the fraction of these that are true b-jets. We
compare our results to Leading Order (Pythia and Herwig) and Next to
Leading Order (MC@NLO) predictions.
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April 2005 |
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Preliminary results are presented of the the single inclusive bottom jet cross
section for events containg a Z boson. The jets must have a transverse energy E_T > 20 GeV
and pseudoradity |eta | < 1.5. Jets are measured with a cone algorithm with cone size 0.7.
Events are selected for the decay channels Z -> e+e- and Z -> mu+mu-. Jets containing
a b hadron are indentified by reconstructing a secondary vertex. The measurement is based
on 337 pb^-1 for the e decay channel and 324 pb^-1 for the mu decay channel. The data are
unfolded to the hadron level and compared to predictions from PYTHIA and NLO QCD
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September 2005 |
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We measure the photon + b and photon + c cross-sections. We present cross-sections both as a function of photon Et, in order to test QCD predictions at different energy scales, and for all photons with an
Et exceeding 25 GeV to gain maximal statistical sensitivity to deviations that could signal new physics production. Results are compared to and found to be consistent with Pythia LO predictions. We find no
evidence so far of new physics production.
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November 2003
public note |
| Photons | |
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Analysis of Diphoton Production using 207 pb^-1 of Run II data
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August 2004
PRL 95, 022003 (2005)
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| Underlying Event, Fragmentation Studies | |
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The behavior of the "underlying event" in hard scattering proton-antiproton collisions at 1.96 TeV is studied and compared with PYTHIA Tune A
and with the CDF published Run 1 analysis. The "underlying event" is studied using both "charged particle jets"
(as was done in our Run 1 analysis) and using "calorimeter jets". As expected the properties of the "underlying event" are the same
for both the "charged particle jet" and the "calorimeter jet" approach and both agree with the Run 1 analysis.
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April 2003 |
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Presented are the measurements of two-particle momentum correlations in jets produced in p-pbar collisions at center of mass frame energy 1.96 TeV. Studies were performed for charged particles within a restricted opening angle of 0.5 rad around the jet axis and for dijet events with masses ranging from about 60 to 600 GeV. Comparison of the experimental results to the theoretical predictions obtained for partons within the framework of the resummed perturbative QCD (Next-to-leading Log Approximation) shows that the parton momentum correlations do survive the hadronization stage of jet fragmentation, thus giving further support to the hypothesis of Local Parton-Hadron Duality.
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October 2005 |
| Diffraction and Exclusive Production | |
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The diffractive dijet events studied are characterized by the presence of two jets resulting
from a hard scattering and a leading antiproton, which escapes the collision intact.
Using Run II data and dedicated diffractive triggers, a measurement of the diffractive structure
function of the antiproton and a study of Double Pomeron Exchange (DPE) event candidates are presented.
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March 2003
Look for new results soon!
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We report on a search for exclusive e+e- and exclusive diphoton. Using Run II data collected in a dedicated trigger, 10 e+e- and 3 diphoton candidates were found. Backgrounds have not been estimated yet.
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Dec 2005
Look for new results soon!
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Exclusive Dijet Production in Double Pomeron Exchange Production
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May 2003
Look for new results soon!
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Exclusive chi_c Production Analysis using Run II data
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September 2003 |
or on the title for plots)