1,552 research outputs found
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Report of the working group on precision measurements - measurements of the W boson mass and width.
No full textWe discuss the prospects for measuring the W mass and width in Run II. The basic techniques used to measure M{sub W} are described and the statistical, theoretical and detector-related uncertainties are discussed in detail. Alternative methods of measuring the W mass at the Tevatron and the prospects for M{sub W} measurements at other colliders are also described
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The CDF online silicon vertex tracker
No full textThe CDF Online Silicon Vertex Tracker reconstructs 2-D tracks by linking hit positions measured by the Silicon Vertex Detector to the Central Outer Chamber tracks found by the eXtremely Fast Tracker. The system has been completely built and assembled and it is now being commissioned using the first CDF run II data. The precision measurement of the track impact parameter will allow triggering on B hadron decay vertices and thus investigating important areas in the B sector, like CP violation and B{sub s} mixing. In this paper we briefly review the architecture and the tracking algorithms implemented in the SVT and we report on the performance of the system achieved in the early phase of CDF run II
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Silicon vertex tracker: A fast precise tracking trigger for CDF
No full textThe Silicon Vertex Tracker (SVT), currently being built for the CDF II experiment, is a hardware device that reconstructs 2-D tracks online using measurements from the Silicon Vertex Detector (SVXII) and the Central Outer Tracker (COT). The precise measurement of the impact parameter of the SVT tracks will allow, for the first time in a hadron collider environment, to trigger on events containing B hadrons that are very important for many studies, such as CP violation in the b sector and searching for new heavy particles decaying to b{bar b}. In this report we describe the overall architecture, algorithms and the hardware implementation of the SVT
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The CDF silicon vertex tracker: Online precision tracking of the CDF silicon vertex
No full textThe Silicon Vertex Tracker is the CDF online tracker which will re- construct 2D tracks using hit positions measured by the Silicon Vertex Detector and Central Outer Chamber tracks found by the eXtremely Fast Tracker. The precision measurement of the track impact parameter will allow triggering on events contain- ing B hadrons. This will allow the investigation of several important problems in B physics, like CP violation and Bs mixing, and to search for new heavy particles decaying to b{anti b}
Precise measurement of the W-boson mass with the Collider Detector at Fermilab
No full textWe present a measurement of the W-boson mass, MW, using data corresponding to 2.2 fb−1 of integrated luminosity collected in pp collisions at √s =1.96 TeV with the CDF II detector at the Fermilab Tevatron. The selected sample of 470,126 W→eν candidates and 624,708 W→μν candidates yields the measurement MW=80387±12(stat)±15(syst)=80387±19 MeV/c2. This is the most precise single measurement of the W-boson mass to date
Modification to the Lattice of the Fermilab Debuncher Ring to Improve the Performance of the Stochastic Cooling Systems
No full textMeasurement of the W(+)W(-) production cross section in pp collisions at square root[s]=1.96 TeV using dilepton events.
No full textWe present a measurement of the W(+)W(-) production cross section using 184 pb(-1) of p(p) collisions at a center-of-mass energy of 1.96 TeV collected with the Collider Detector at Fermilab. Using the dilepton decay channel W(+)W(-)-->l(+)nul(-), where the charged leptons can be either electrons or muons, we find 17 candidate events compared to an expected background of 5.0(+2.2)(-0.8) events. The resulting W(+)W(-) production cross-section measurement of sigma(pp-->W(+)W(-))=14.6(+5.8)(-5.1)(stat)(+1.8)(-3.0)(syst) +/- 0.9(lum) pb agrees well with the standard model expectation
Evidence for W+W- production in (p)over-bar-p collisions at root s=1.8 TeV
No full textWe present results of a search for W+W- production through the leptonic decay channel W+W- --> l(+)l(-) in collision at root s = 1.8 TeV. In a 108 pb(-1) data sample recorded with the Collider Detector at Fermilab, five W+W- candidates are found with an expected standard model background of 1.2 +/- 0.3 events. The W+W- production cross section is measured to be sigma( --> W+W-) = 10.2(-5.1)(+6.3)(stat) +/- 1.6(syst) pb, in agreement with the standard model prediction. Limits on WW gamma and WWZ anomalous couplings are presented
Search for a W' boson via the decay mode W'-->munumu in 1.8 TeV pp collisions.
No full textWe report the results of a search for a W' boson produced in pp collisions at a center-of-mass energy of 1.8 TeV using a 107 pb-1 data sample recorded by the Collider Detector at Fermilab. We consider the decay channel W'-->andmunumu and search for anomalous production of high transverse mass munumu lepton pairs. We observe no excess of events above background and set limits on the rate of W' boson production and decay relative to standard model W boson production and decay using a fit of the transverse mass distribution observed. If we assume standard model strength couplings of the W' boson to quark and lepton pairs, we exclude a W' boson with invariant mass less than 660 GeV/c2 at 95% confidence level
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