1,761,823 research outputs found
New determination of the D0→K -π +π0 and D0→K -π +π +π - coherence factors and average strong-phase d
Get PDFMeasurements of the coherence factors (RKππ0 and R K3π) and the average strong-phase differences (δDKππ0 and δDK3π) for the decays D0→K -π +π0 and D0→K -π +π +π - are presented. These parameters are important inputs to the determination of the unitarity triangle angle γ in B ∓→DK ∓ decays, where D designates a D0 or D-0 meson decaying to a common final state. The measurements are made using quantum correlated DD- decays collected by the CLEO-c experiment at the ψ(3770) resonance, and augment a previously published analysis by the inclusion of new events in which the signal decay is tagged by the mode D→KS0π+π- The measurements also benefit from improved knowledge of external inputs, namely the D0D-0 mixing parameters, rDKπ and several D-meson branching fractions. The measured values are RKππ0=0.82±0.07, δDKππ0=(164-14+20)°, RK3π=0.32-0.28+0.20 and δDK3π=(225-78+21)°. Consideration is given to how these measurements can be improved further by using the larger quantum-correlated data set collected by BESIII
Measurement of Mixing and CP Violation in the Two-Body D0 decays to KK, pipi and Kpi with the BaBar Experiment
Get PDFWe present a measurement of D0-D0bar mixing and CP violation using the ratio of lifetimes simultaneously extracted from a sample of D0 mesons produced through the flavor-tagged process D*+ -> D0 pi+, where D0 decays to D0->Kpi, KK, or pipi, along with the untagged decays D0 -> Kpi and D0 -> KK. The lifetimes of the CP-even, Cabibbo-suppressed modes KK and pipi are compared to that of the CP-mixed mode Kpi in order to measure yCP and DeltaY.
We obtain yCP = [0.72 +/- 0.18 (stat) +/- 0.12 (syst)]% and DeltaY = [0.09 +/- 0.26 (stat) +/- 0.06 (syst)]%, where DeltaY constrains possible CP violation. The yCP result excludes the null mixing hypothesis at 3.3 sigma significance. This analysis is based on an integrated luminosity of 468 fb^{-1} collected with the Babar, detector at the PEP-II asymmetric-energy e+e- collider
Combined search for the Higgs boson with the D0 experiment
Get PDFWe perform a combination of searches for standard model Higgs boson production in collisions recorded by the D0 detector at the Fermilab Tevatron Collider at a center of mass energy of TeV. The different production and decay channels have been analyzed separately, with integrated luminosities of up to 9.7 fb and for Higgs boson masses GeV. We combine these final states to achieve optimal sensitivity to the production of the Higgs boson. We also interpret the combination in terms of models with a fourth generation of fermions, and models with suppressed Higgs boson couplings to fermions. The result excludes a standard model Higgs boson at 95% C.L. in the ranges $90 M_HM_
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New technologies in the D0 central tracker upgrade
Get PDFThe D0 collaboration has undertaken an aggressive upgrade of its central tracking system. The existing tracker will be completely removed and replaced by a two Tesla superconducting solenoidal magnet, an 837 000 channel silicon vertex system, and 80 000 channel scintillating fiber tracker, followed by a 7 680 channel central preshower detector and a 16 000 channel forward preshower detector. In this paper the author discusses all of the subsystems of the D0 central tracker upgrade, but will emphasize those aspects which involve new technology: radiation hard scintillating fiber, VLPC`s and extruded scintillating strips
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SUSY Searches at D0
No full textSearches for evidence of supersymmetric particles, and other phenomena beyond the Standard Model, are well underway with the D0 detector at the Tevatron. The D0 detector has good central tracking, excellent energy and missing E{sub T} resolution, hermetic calorimetry, and wide muon coverage. Preliminary results from searches for gluino/squark production and first generation leptoquark production are presented, based on a small fraction of the data taken to date
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Electroweak physics from D0
No full textThe D0 detector was recently commissioned at the Tevatron p{bar p} collider and is presently taking data. Preliminary results from D0 are presented on properties of the W and Z electroweak gauge bosons, using final states containing electrons and muons
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The D0 calorimeter trigger
No full textThe D0 calorimeter trigger system consists of many levels to make physics motivated trigger decisions. The Level-1 trigger uses hardware techniques to reduce the trigger rate from {approximately} 100kHz to 200Hz. It forms sums of electromagnetic and hadronic energy, globally and in towers, along with finding the missing transverse energy. A minimum energy is set on these energy sums to pass the event. The Level-2 trigger is a set of software filters, operating in a parallel-processing microvax farm which further reduces the trigger rate to a few Hertz. These filters will reject events which lack electron candidates, jet candidates, or missing transverse energy in the event. The performance of these triggers during the early running of the D0 detector will also be discussed
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The D0 Level 1.5 Calorimeter Trigger
No full textWe describe the design and preliminary performance of the D0 Level 1.5 Calorimeter Trigger
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The D0 experiment at Fermilab
No full textThe D0 experiment at Fermilab is described. The detector is complete and presently taking physics data. Results from beam tests of the calorimeter and an outline of the physics agenda for the present run are also given
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Heavy quark results at D0
Get PDFRecent results in heavy quark physics from the D0 experiment at the Fermilab Tevatron Collider are reported. Topics included are top quark production and mass determination, bottom production and correlations, and charmonium production. 20 refs., 10 figs., 2 tabs
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