3,697 research outputs found
W and Z Properties at the Tevatron
We present recent results from CDF and D0 on W and Z production cross
sections, the width of the W boson, tau-e universality in W decays, trilinear
gauge boson couplings, and on the observation of Z -> b bbar.Comment: Paper presented at the International Europhysics Conference on High
Energy Physics, Tampere, Finland, 15-21 July, 199
Measurements of the W Boson Mass and Trilinear Gauge Boson Couplings at the Tevatron
We present measurements of the W boson mass at the Tevatron based on events collected by CDF and events observed by D0 in Run
Ib (1994--95). The W boson mass measured in the preliminary CDF analysis is
80.43 \pm 0.10 (stat) \pm 0.12 (syst) GeV/c^2. The D0 measured value is 80.44
\pm 0.10 (stat) \pm 0.07 (syst) GeV/c^2. We also describe measurements of the
trilinear gauge boson couplings. The limits obtained on the WW\gamma and WWZ
anomalous couplings from a combined D0 analysis using , , and production are: -0.30 <
\Delta\kappa < 0.43, -0.20 < \lambda < 0.20, and -0.52 < \Delta g^Z_1 < 0.78,
for a dipole form factor scale of 2 TeV. Improved limits have been obtained by
combining these results with the limits derived from the LEP experiments.Comment: 7 pages, including 6 figures. Paper to be published in Proceedings of
the XXXIIId Rencontres de Moriond, Electroweak Interactions and Unified
Theories, Les Arcs, Savoie, France, March 14-21 199
Top Quark Physics Results from D0
We describe recent measurements of the ttbar production cross section and the
mass of the top quark from the D0 Collaboration.Comment: To appear in the proceedings of the Lake Louise Winter Institute,
Lake Louise, Alberta, Canada, 15-21 February 200
B-Physics at the Tevatron (Proceedings of PASCOS2010)
We report on recent B-Physics results from the Tevatron. The topics covered
include measurement of the polarization amplitudes in ,
the search for rare flavor-changing neutral-current decays, CP violation in
and semileptonic decays, and a new measurement
of the like-sign asymmetry in dimuon events.Comment: 6 pages, proceedings paper, 16th International Symposium on
Particles, Strings, and Cosmology, Valencia, Spain, July 19 - 23, 201
Prediction, Retrodiction, and The Amount of Information Stored in the Present
We introduce an ambidextrous view of stochastic dynamical systems, comparing
their forward-time and reverse-time representations and then integrating them
into a single time-symmetric representation. The perspective is useful
theoretically, computationally, and conceptually. Mathematically, we prove that
the excess entropy--a familiar measure of organization in complex systems--is
the mutual information not only between the past and future, but also between
the predictive and retrodictive causal states. Practically, we exploit the
connection between prediction and retrodiction to directly calculate the excess
entropy. Conceptually, these lead one to discover new system invariants for
stochastic dynamical systems: crypticity (information accessibility) and causal
irreversibility. Ultimately, we introduce a time-symmetric representation that
unifies all these quantities, compressing the two directional representations
into one. The resulting compression offers a new conception of the amount of
information stored in the present.Comment: 17 pages, 7 figures, 1 table;
http://users.cse.ucdavis.edu/~cmg/compmech/pubs/pratisp.ht
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