The CDF plug upgrade electromagnetic calorimeter: test beam results
Fermilab1, University of Tsukuba2, Rockefeller University3, University of New Mexico4, University of Rochester5, Purdue University6, Istituto Nazionale di Fisica Nucleare7, University of Udine8, Texas Tech University9, KEK10, University of Padua11, Hiroshima University12, Waseda University13, Duke University14, Brandeis University15, University of California, Los Angeles16, University of Wisconsin-Madison17, Michigan State University18
21 Mar 2002-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment (North-Holland)-Vol. 480, Iss: 2, pp 524-546
TL;DR: The CDF Plug Upgrade calorimeter, which fully exploits the tile-fiber technique, was tested at the Fermilab meson beamline and was exposed to positron, positively charged pion and positive muon beams with energies in the range of 5- 230 GeV.
Abstract: The CDF Plug Upgrade calorimeter, which fully exploits the tile–fiber technique, was tested at the Fermilab meson beamline. The calorimeter was exposed to positron, positively charged pion and positive muon beams with energies in the range of 5– 230 GeV . The energy resolution of the electromagnetic calorimeter to the positron beam is consistent with the design value of 16%/ E ⊕1% , where E is the energy in units of GeV and ⊕ represents sum in quadrature. The non-linearity for positrons is studied in an energy range of 11– 181 GeV . It is important to incorporate the response of the preshower detector, the first layer of the electromagnetic calorimeter which is readout separately, into that of the calorimeter to reduce the non-linearity to 1% or less. The energy scale is about 1.46 pC / GeV with HAMAMATSU R4125 operated typically at a gain of 2.5×104. The response non-uniformity over the surface of a tower of the electromagnetic calorimeter is found to be about 2% with 57 GeV positrons. Studies of several detailed detector characteristics are also presented.
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TL;DR: Campagnari and Mulders as discussed by the authors measured the W boson mass, MW, using data corresponding to 8.8 inverse femtobarns of integrated luminosity collected in proton-antiproton collisions at a 1.96 tera-electron volt center-of-mass energy with the Fermilab Tevatron collider.
Abstract: The mass of the W boson, a mediator of the weak force between elementary particles, is tightly constrained by the symmetries of the standard model of particle physics. The Higgs boson was the last missing component of the model. After observation of the Higgs boson, a measurement of the W boson mass provides a stringent test of the model. We measure the W boson mass, MW, using data corresponding to 8.8 inverse femtobarns of integrated luminosity collected in proton-antiproton collisions at a 1.96 tera–electron volt center-of-mass energy with the CDF II detector at the Fermilab Tevatron collider. A sample of approximately 4 million W boson candidates is used to obtain MW=80,433.5±6.4stat±6.9syst=80,433.5±9.4 MeV/c2, the precision of which exceeds that of all previous measurements combined (stat, statistical uncertainty; syst, systematic uncertainty; MeV, mega–electron volts; c, speed of light in a vacuum). This measurement is in significant tension with the standard model expectation. Description Weighing the W boson W bosons mediate the weak interaction, one of the fundamental forces in physics. Because the Standard Model (SM) of particle physics places tight constraints on the mass of the W boson, measuring the mass puts the SM to the test. The Collider Detector at Fermilab (CDF) Collaboration now reports a precise measurement of the W boson mass extracted from data taken at the Tevatron particle accelerator (see the Perspective by Campagnari and Mulders). Surprisingly, the researchers found that the mass of the boson was significantly higher than the SM predicts, with a discrepancy of 7 standard deviations. —JS Analysis of the data collected at the Tevatron particle collider finds that the W boson is heavier than expected.
431 citations
Rockefeller University1, University of California, Los Angeles2, University of Liverpool3, University of Chicago4, University of Pennsylvania5, University of Toronto6, Lawrence Berkeley National Laboratory7, University of Rochester8, Carnegie Mellon University9, University College London10, University of Geneva11, Istituto Nazionale di Fisica Nucleare12, Fermilab13, University of Florida14, Michigan State University15, Argonne National Laboratory16, Wayne State University17
15 Oct 2006-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: In this paper, a precise determination of the energy scale of jets at the Collider Detector at Fermilab at the Tevatron p p p ¯ collider is described.
Abstract: A precise determination of the energy scale of jets at the Collider Detector at Fermilab at the Tevatron p p ¯ collider is described. Jets are used in many analyses to estimate the energies of partons resulting from the underlying physics process. Several correction factors are developed to estimate the original parton energy from the observed jet energy in the calorimeter. The jet energy response is compared between data and Monte Carlo simulation for various physics processes, and systematic uncertainties on the jet energy scale are determined. For jets with transverse momenta above 50 GeV the jet energy scale is determined with a 3 % systematic uncertainty.
171 citations
TL;DR: In this article, the authors reported the first measurements of W and Z boson cross-sections times the corresponding leptonic branching ratios for collisions at TeV based on the decays of the W and z bosons into electrons and muons.
Abstract: We report the first measurements of inclusive W and Z boson cross-sections times the corresponding leptonic branching ratios for collisions at TeV based on the decays of the W and Z bosons into electrons and muons. The data were recorded with the CDF II detector at the Fermilab Tevatron and correspond to an integrated luminosity of 72.0 ± 4.3 pb−1. We test e-μ lepton universality in W decays by measuring the ratio of the W → μν to W → eν cross sections and determine a value of 0.991 ± 0.004(stat.) ± 0.011(syst.) for the ratio of W − l − ν couplings (gμ/ge). Since there is no sign of non-universality, we combine our cross-section measurements in the different lepton decay modes and obtain nb and pb for dilepton pairs in the mass range between 66 GeV/c2 and 116 GeV/c2. We compute the ratio R of the W → lν to Z → ll cross sections taking all correlations among channels into account and obtain R = 10.84 ± 0.15(stat.) ± 0.14(syst.) including a correction for the virtual photon exchange component in our measured γ*/Z → ll cross section. Based on the measured value of R, we extract values for the W leptonic branching ratio, Br(W → lν)= 0.1082 ± 0.0022; the total width of the W boson, Γ(W)= 2092 ± 42 MeV; and the ratio of W and Z boson total widths, Γ(W)/Γ(Z)= 0.838 ± 0.017. In addition, we use our extracted value of Γ(W) whose value depends on various electroweak parameters and certain CKM matrix elements to constrain the Vcs CKM matrix element, |Vcs| = 0.976 ± 0.030.
106 citations
TL;DR: The top quark is the largest elementary particle observed to date and its large mass makes it an ideal laboratory to test predictions of perturbation theory concerning heavy quark production at hadron colliders as discussed by the authors.
Abstract: The top quark is the heaviest elementary particle observed to date. Its large mass makes the top quark an ideal laboratory to test predictions of perturbation theory concerning heavy quark production at hadron colliders. The top quark is also a powerful probe for new phenomena beyond the Standard Model (SM) of particle physics. In addition, the top quark mass is a crucial parameter for scrutinizing the SM in electroweak precision tests and for predicting the mass of the yet unobserved Higgs boson. Ten years after the discovery of the top quark at the Fermilab Tevatron, top quark physics has entered an era where detailed measurements of top quark properties are undertaken. In this paper an introduction to the phenomenology of top quark production in hadron collisions is given, the lessons learned in Tevatron Run I are summarized and the first Run II results are discussed. A brief outlook of the possibilities of top quark research at the Large Hadron Collider, currently under construction at CERN, is included.
85 citations
TL;DR: In this article, the authors report on a study of jet shapes in inclusive jet production in $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{ }\mathrm{TeV}$ using the upgraded collider detector at Fermilab in Run II (CDF II) and based on an integrated luminosity of $170
Abstract: We report on a study of jet shapes in inclusive jet production in $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{ }\mathrm{TeV}$ using the upgraded collider detector at Fermilab in Run II (CDF II) and based on an integrated luminosity of $170\text{ }\mathrm{p}{\mathrm{b}}^{\ensuremath{-}1}$. Measurements are carried out on jets with rapidity $0.1l|{Y}^{\mathrm{jet}}|l0.7$ and transverse momentum $37\text{ }\text{ }\mathrm{GeV}/cl{P}_{T}^{\mathrm{jet}}l380\text{ }\text{ }\mathrm{GeV}/c$. The jets have been corrected to the hadron level. The measured jet shapes are compared to leading-order QCD parton-shower Monte Carlo predictions as implemented in the PYTHIA and HERWIG programs. PYTHIA, tuned to describe the underlying event as measured in CDF Run I, provides a better description of the measured jet shapes than does PYTHIA or HERWIG with their default parameters.
83 citations
References
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01 Jan 1994
TL;DR: In this article, the authors present a new approach to forward sampling calorimetry for LHC/SSC experiments, using the simulation program GEANT, and a new plug of CDF.
Abstract: Selected topics in sampling calorimetry, D. Green ionization EM calorimetry with accordion electrodes and LKr or Ar, V. Radeka readout of pure cesium iodide by avalanche photodiodes, E. Lorenz first observation of the scintillation of liquid xenon, krypton and argon with a Csl photocathode, V. Peskov monolithic front-end preamplifiers for a broad range of calorimetry applications, P.E. Manfredi shashlik calorimeter for CMS, R. Tanaka a lead scintillating fiber calorimeter for the upgraded H1 detector, U. Goerlach new plug of CDF, M. Mishina the PHENIX calorimeter at RHIC, S. White SDC calorimeter trigger, S. Dasu first results from a level-1 calorimeter trigger system for LHC, T. Gillman results from crystal clear collaboration, P. Lecoq electromagnetic calorimetry with lead fluoride crystal, R. Appuhn a crystal calorimeter for CMS, J. Virdee LHC liquid Ar Hadron calorimeter, B. Mansoulie performance of a pb-scint - fibers calorimeter prototype for the KLOE experiment, S. Miscetti a new approach to forward calorimetry for LHC/SSC experiments, R. Wigmans high pressure gas calorimeter, R. Shuvalov simulation programs overview, F. Carminati experimental benchmark of the simulation program GEANT, L. Urban FLUKA, A. Ferrari development of radiation hard scintillators, F. Markley radiation resistance of a scintillating fibre calorimeter, A. Maio summary of radiation damage test for scintillating tile and WLS fiber for the SDC calorimeter, A. Byon Wagner shashlik radiation hardness, J. Badier. (Part Contents).
15 citations