Bulletin of the American Physical Society
APS April Meeting 2010
Volume 55, Number 1
Saturday–Tuesday, February 13–16, 2010; Washington, DC
Session A12: Jets |
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Sponsoring Units: DPF Chair: Ben Kilminster, Fermi National Accelerator Laboratory Room: Virginia A |
Saturday, February 13, 2010 8:30AM - 8:42AM |
A12.00001: Inclusive Jet Production in Z+jets final states at CDF Stefano Camarda We present preliminary results on the measurement of the inclusive Z-boson plus jet(s) production cross section, in a final state where the Z-boson has decayed in two muons. We used $\sim 5$ fb$ ^{-1}$ data in $\rm p\bar{p}$ collisions at $\rm \sqrt{s}$ = 1.96 TeV collected by the CDF Run II experiment. Differential cross sections as a function of jet transverse momentum and jet multiplicity are compared to NLO pQCD predictions. [Preview Abstract] |
Saturday, February 13, 2010 8:42AM - 8:54AM |
A12.00002: Measurement of Z+b-jet production cross section and ratio $\sigma$(Z+b jet)/$\sigma$(Z+jet) at D0 Kenneth Smith The inclusive Z+b jet production is an important background to searches for the Higgs boson in associated ZH production at the Fermilab Tevatron collider. We present measurements of the ratio of inclusive cross sections for $p\bar{p}\to Z+b$ jet to $p\bar{p} \to Z+$jet production as well as inclusive $Z+b$ jet cross section. The measurements use a data sample from $p\bar{p}$ collisions at $\sqrt{s}$=1.96 TeV corresponding to an integrated luminosity of 5.4 fb$^{-1}$ collected by the D0 detector. $Z$ bosons are selected in the electron and muon decay modes. The measurements are compared with the next-to-leading order theoretical predictions. [Preview Abstract] |
Saturday, February 13, 2010 8:54AM - 9:06AM |
A12.00003: ABSTRACT WITHDRAWN |
Saturday, February 13, 2010 9:06AM - 9:18AM |
A12.00004: W$\rightarrow\ell\nu~+ \geq n$ jets at CDF Dale Stentz We present results on the production of W bosons associated with hadronic jets at the Collider Detector at Fermilab (CDF II). W~$+ \geq n$ jets provides a way to study theoretical perturbative QCD predictions at high momentum transfer and is an important background for top and higgs production. We study both the electron and muon decay channels using an integrated luminosity of 2.8~fb$^{-1}$ with up to four inclusive number of jets with $p^{jet}_{T} > 20$ GeV/c$^{2}$ and $|\eta^{jet}| < 2.0$. Differential cross-sections of various jet kinematics are measured and compared to theoretical predictions. These include the inclusive jet multiplicity cross-section (d$\sigma/$d$n$), the $n^{th}$ leading jet transverse momentum spectrum (d$\sigma/$d$p_{T}$), and the dijet separation and mass differential cross-sections (d$\sigma/$d$R_{jj}$ and d$\sigma/$d$m_{jj}$, respectively). [Preview Abstract] |
Saturday, February 13, 2010 9:18AM - 9:30AM |
A12.00005: Inclusive three-jet cross section at D0 Zdenek Hubacek We analyze multijet production in a dataset corresponding to an integrated luminosity of 0.7 fb$^{-1}$ collected with the D0 detector at the Fermilab Tevatron Collider. Thus far, all jet-only tests of QCD at a collision energy of 1.96 TeV use either inclusive jet or dijet final states. We extend this effort by investigating the inclusive three-jet final state. Fully describing the three-jet final state requires eight variables. In this analysis, we present the measurement of the inclusive three-jet cross section as a function of three-jet invariant mass in bins of softest jet transverse momenta and in bins of jet rapidities. [Preview Abstract] |
Saturday, February 13, 2010 9:30AM - 9:42AM |
A12.00006: Measurement of ratio of 3-jet to 2-jet cross sections Scott Atkins Recent measurements on multijet production in ppbar collisions at sqrt{s} = 1.96 TeV are presented. We analyze the data set corresponding to an integrated luminosity of 0.7 fb$^{-1}$ taken with the D0 detector at the Fermilab Tevatron collider. The measured observable is the ratio of 3-jet to 2-jet inclusive jet cross-sections. This ratio is measured as a function of transverse jet momentum. [Preview Abstract] |
Saturday, February 13, 2010 9:42AM - 9:54AM |
A12.00007: Initial Measurement of the Inclusive Jet Cross Section at 10 TeV with CMS Keith Rose A plan for the measurement of the differential inclusive jet production cross section at the Compact Muon Solenoid experiment (CMS) assuming 10/pb of integrated luminosity from proton-proton collisions at a center of mass energy of 10 TeV is presented. The reach in transverse jet momentum is beyond any previous collider experiment and the TeV scale of jet physics can be probed. The analysis is performed on fully simulated CMS events which are adopted as pseudo data. Jets are reconstructed from calorimeter energy depositions with two different algorithms; Inclusive kT and Seedless Infrared-Safe Cone. The steps for the spectrum construction from triggered events are described in detail and the major experimental and theoretical uncertainties are discussed. A simple noise rejection cut is also proposed for the purpose of event cleanup. [Preview Abstract] |
Saturday, February 13, 2010 9:54AM - 10:06AM |
A12.00008: Inclusive Jet Cross Section in Early LHC Data using the ATLAS Inner Detector S.C. Zenz We present a method to study the emergence of low-momentum hadronic jets from soft proton-proton collisions with the ATLAS experiment at the Large Hadron Collider at CERN. The jets are reconstructed using tracks from the ATLAS Inner Detector. The track-based measurement will provide an independent check of calorimeter-based jet studies, and will allow the study of lower-momentum jets. This jet cross-section measurement, at the LHC's previously-unexplored energies, will provide new tests of quantum chromodynamics. We report on studies with Monte Carlo-simulated events for an analysis planned for early, low-luminosity data collected with a minimum bias trigger. [Preview Abstract] |
Saturday, February 13, 2010 10:06AM - 10:18AM |
A12.00009: $D^0$ Reconstruction in $b$-jets for Events with $Z^0\rightarrow \mu^+\mu^-$ + $b$-jet Jessica Metcalfe, I. Gorelov, S. Seidel, K. Toms A Monte Carlo study on $b$-jet heavy quark fragmentation in ATLAS using fully reconstructed hadronic $D$ mesons is presented. Events with a $Z^0\rightarrow \mu^+\mu^-$ and a $b$-jet where $b\rightarrow D+X$ were studied. Several charmed hadronic modes were reconstructed. Presented here are the decay channels $D^0\rightarrow K^-\pi^+$ and D$^{*+}\rightarrow D^0\pi^+, D^0\rightarrow K^- \pi^+ $. The mass resolution of the $D^0$ and $D^{*+}$ is reported as well as the yield and reconstruction efficiencies for each species and the shape of the $b$-jet in terms of the $p_{\mathrm{T}}$ distribution of the $D$ meson with respect to the jet axis. When these measurements are repeated with and compared to real LHC data, they will provide important information on the $b$-quark parton distribution inside the proton, and on the $b$-quark fragmentation distribution. Moreover, the analysis, when applied to real data, will give a better understanding of QCD backgrounds and provide an additional tool to constrain the $b$-jet energy scale. [Preview Abstract] |
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