408 research outputs found
Diboson Production Cross Sections at TeV
The increasing size of the data recorded by the CDF and D{\O} experiments at
the Tevatron collider at 1.96 TeV makes the diboson physics program
more accessible for probes of the electroweak gauge structure in the Standard
Model. Here we summarize the most recent measurements of the diboson cross
sections and limits on the trilinear gauge boson couplings.Comment: 4 pages, 2 figures, Conference Procceding for The XLIVth Rencontres
de Moriond session devoted to QCD and High Energy Interactions, La Thuile,
Italy, March 14-21, 200
Measurements of the Trilinear Gauge Boson Couplings from Diboson Production at D0
The most recent measurements of the trilinear gauge boson couplings from the
diboson production at the D0 experiment has been presented. The analyzed final
states are Zgamma->vvgamma, and WW->lvlv, and WW+WZ->lvjj. We also present
results obtained combining all final states involving the W boson. These
results represent the most strigent limits set to date at the hadron collider.Comment: 6 pages, 5 figures, To be published in the proceedings of DPF-2009,
Detroit, MI, July 2009, eConf C09072
Studies of Gauge Boson Production with a gamma/gamma-collider at TESLA
In absence of the Standard Model Higgs boson the interaction among the gauge
bosons becomes strong at high energies and influences the couplings between
them. Each trilinear and quartic gauge boson vertex is characterised by a set
of couplings which are expected to deviate from their Standard Model values
already at energies lower than the energy scale of the New Physics.The precise
measurement of gauge boson couplings can provide clues to the mechanism of the
electroweak symmetry breaking and their anomalous values can be a sign of a New
Physics effect beyond the Standard Model. The estimated precisions of the
trilinear gauge boson coupling (TGC) measurements at a photon collider are
about one to two orders of magnitude higher than at LEP and Tevatron providing
a measurement highly sensitive to the physics beyond the Standard Model. The
optimisation of the forward region of the photon collider detector brings the
amount of the low-energy background to the manageable level providing a clean
environment for the TGC measurements at a photon collider with estimated
precisions.Comment: PhD Theses, ~150page
Search for Violation of CPT and Lorentz Invariance in B s O Meson Oscillations
We present the first search for CPT-violating effects in the mixing of B0s mesons using the full Run II data set with an integrated luminosity of 10.4 fb−1 of proton-antiproton collisions collected using the D0 detector at the Fermilab Tevatron Collider. We measure the CPT-violating asymmetry in the decay B0s→μ±D±s as a function of celestial direction and sidereal phase. We find no evidence for CPT-violating effects and place limits on the direction and magnitude of flavor-dependent CPT- and Lorentz-invariance violating coupling coefficients. We find 95% confidence intervals of Δa⊥<1.2×10−12 GeV and (−0.8<ΔaT−0.396ΔaZ<3.9)×10−13 GeV
Precision measurement of the top-quark mass in lepton+jets final states
We measure the mass of the top quark in lepton+jets final states using the full sample of pp¯ collision data collected by the D0 experiment in Run II of the Fermilab Tevatron Collider at s√=1.96 TeV, corresponding to 9.7 fb−1 of integrated luminosity. We use a matrix element technique that calculates the probabilities for each event to result from tt¯ production or background. The overall jet energy scale is constrained in situ by the mass of the W boson. We measure mt=174.98±0.76 GeV. This constitutes the most precise single measurement of the top-quark mass
Measurement of the Forward-Backward Asymmetry in the Production of B± Mesons in pp¯ Collisions at s√=1.96 TeV
We present a measurement of the forward-backward asymmetry in the production of B± mesons, AFB(B±), using B±→J/ψK± decays in 10.4 fb−1 of pp¯ collisions at s√=1.96 TeV collected by the D0 experiment during Run II of the Tevatron collider. A nonzero asymmetry would indicate a preference for a particular flavor, i.e., b quark or b¯ antiquark, to be produced in the direction of the proton beam. We extract AFB(B±) from a maximum likelihood fit to the difference between the numbers of forward- and backward-produced B± mesons. We measure an asymmetry consistent with zero: AFB(B±)=[−0.24±0.41 (stat)±0.19 (syst)]%
Search for New Fermions (“Quirks”) at the Fermilab Tevatron Collider
This is the publisher's version, also available electronically from http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.105.211803.We report results of a search for particles with anomalously high ionization in events with a high transverse energy jet and large missing transverse energy in 2.4 fb(−1) of integrated luminosity collected by the D0 experiment at the Fermilab Tevatron pp-bar collider. Production of such particles (quirks) is expected in scenarios with extra QCD-like SU(N) sectors, and this study is the first dedicated search for such signatures. We find no evidence of a signal and set a lower mass limit of 107, 119, and 133 GeV for the mass of a charged quirk with strong dynamics scale Λ in the range from 10 keV to 1 MeV and N=2, 3, and 5, respectively
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