In 1996 LEP ran at a centre-of-mass energy of 161 GeV, just above the threshold of W-pair production. DELPHI accumulated data corresponding to an integrated luminosity of 9.93 pb
−1, and observed 29 ...events that are considered as candidates for W-pair production. From these, a cross-section for the doubly resonant e
+e
− → WW process of 3.67
−0.85
+0.97 ± 0.19 pb has been measured. Within the Standard Model, this cross-section corresponds to a mass of the W-boson of 80.40 ± 0.44 (stat.) ± 0.09 (syst.) ± 0.03 (LEP) GeV/
c
2. Alternatively, if
m
W is held fixed at its current value determined by other experiments, the observed cross-section is used to obtain limits on trilinear WWV (V ≡ γ, Z) couplings.
Decays of
W
± bosons, produced at LEP2, have been used to measure the |
V
cs
| element of the Cabibbo-Kobayashi-Maskawa matrix. Values for |
V
cs
| were extracted both from the measured hadronic ...branching ratio of
W
± decays and by tagging the flavour of hadronic jets produced in
W
± decays. Applying the two methods to the data collected during 1996 at energies of 161 and 172 GeV, DELPHI obtains |
V
cs
|=0.91
+0.15
−0.14(stat)±0.05(syst).
The DELPHI Silicon Tracker at LEP2 Chochula, P; Rosinský, P; Andreazza, A ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
08/1998, Letnik:
412, Številka:
2-3
Journal Article
Recenzirano
Odprti dostop
It is now considered that the information available in bibliographical databases is dated, validated through a long process which does not make it very innovative. Furthermore, database processing is ...normally performed using boolean operators : the results obtained from a query provides a sum of expected information which, in itself, does not deliver any novelty. Don Swanson's work demonstrates the unsuspected potential of bibliographical databases in revealing and discovering knowledge.The interest of his approach lies less on the available information itself than on the methodology used to disclose new knowledge. This general methodology fits perfectly well within an environment of validated and structured information, as is the case for bibliographical data. The expression Knowledge Discovery in Databases (KDD) indicates a methodology which creates new knowledge based upon bibliographical data. In this article, we will cover the principals of KDD based on Don Swanson's work as well as the method used to disclose knowledge within biomedical bibliographical databases.
The spin density matrix elements for the rho(0), K-*0(892) and phi produced in hadronic Z(0) decays are measured in the DELPHI detector. There is no evidence for spin alignment of the K-*0(892) and ...phi, in the region x(p) less than or equal to 0.3 (x(p) =
Trilinear gauge boson couplings are measured using data taken by DELPHI at 161 GeV and 172 GeV. Values for
WWV couplings (
V=
Z,
γ) are determined from a study of the reactions
e
+
e
−→
W
+
W
− and
e
...+
e
−→
Weν, using differential distributions from the
WW final state in which one
W decays hadronically and the other leptonically, and total cross-section data from other channels. Limits are also derived on neutral
ZVγ couplings from an analysis of the reaction
e
+e
−→
γ
+
invisible
particles
.
Decays of W+/- bosons, produced at LEP2, have been used to measure the \V-cs\ element of the Cabibbo-Kobayashi-Maskawa matrix. Values for \V-cs\ were extracted both from the measured hadronic ...branching ratio of W+/- decays and by tagging the flavour of ha
A search for neutral and charged Higgs bosons has been performed in the data collected by the DELPHI detector at centre-of-mass energies of 161 GeV and 172 GeV. The analysis assumes either the ...pair-production of charged Higgs bosons, H+/-, or the producti
An inclusive measurement of the average multiplicity of b (b) over bar pairs from gluons, g(b (b) over bar), in hadronic Z(0) events collected by the DELPHI experiment at LEP, is presented. A ...counting technique, based on jet b-tagging in 4-jet events, has
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