Showing papers by "Wolfgang Adam published in 1993"
TL;DR: This paper presents national plans on referencing and archiving doctoral theses coordinated by the government as well as some initiatives for creating full text archives.
43 citations
TL;DR: In this paper, a study of the meson resonances View the MathML source in hadronic decays of the Z0 is presented, where the measured mean meson multiplicity per hadronic event is 0.83 ± 0.14.
33 citations
TL;DR: In this article, a study of the fragmentation properties of charm and bottom quarks into D mesons is presented, and first results are presented for the production ofD mesons from the two events separately.
Abstract: A study of the fragmentation properties of charm and bottom quarks intoD mesons is presented. From 263 700Z
0 hadronic decays collected in 1991 with the DELPHI detector at the LEP collider,D
0,D
+ andD
*+ are reconstructed in the modesK
−
π
+,K
−
π
+
K
+ andD
0
π
+ followed byD
0→K
−
π
+, respectively. The fractional decay widths
$$\Gamma {{(Z^0 \to {D \mathord{\left/ {\vphantom {D {\bar D}}} \right. \kern-
ulldelimiterspace} {\bar D}}X)} \mathord{\left/ {\vphantom {{(Z^0 \to {D \mathord{\left/ {\vphantom {D {\bar D}}} \right. \kern-
ulldelimiterspace} {\bar D}}X)} {\Gamma _h }}} \right. \kern-
ulldelimiterspace} {\Gamma _h }}$$
are determined, and first results are presented for the production ofD mesons from
$$c\bar c$$
and
$$b\bar b$$
events separately. The average energy fraction ofD
*± in charm quark fragmentation is found to be 〈X
E
(D
*)〉
c
=0.487±0.015 (stat)±0.005 (sys.). Assuming that the fraction ofD
s
and charm-baryons produced at LEP is similar to that around 10 GeV, theZ
0 partial width into charm quark pairs is determined to beΓ
c
/Γ
h
=0.187±0.031 (stat)±0.023 (sys). The probability for ab quark to fragment into
$$\bar B_s $$
orb-baryons is inferred to be 0.268±0.094 (stat)±0.100 (sys) from the measured probability that it fragments into a
$$\bar B^0 $$
orB
−.
24 citations
TL;DR: In this article, the DELPHI detector was used to detect the production of b-flavoured baryons in Z0 decays from the analysis of 365, 000 hadronic events collected by the detector and the lifetime was determined to be τ(Λb) = (1.04+0.48−0.10) ps.
22 citations
TL;DR: In this paper, the authors used the Nachtmann Reiter angle θNR* and the opening angle of the two least energetic jets to determine the contribution of the triple-gluon vertex.
Abstract: From the combined data of 1990 and 1991 of the DELPHI experiment at LEP, 13057 4-jet events are obtained and used for determining the contribution of the triple-gluon vertex. The relevant variables are the generalized Nachtmann Reiter angle θNR* and the opening angle of the two least energetic jets. A fit to their two-dimensional distribution yields
$$C_A /C_F = 2.12 \pm 0.35 and N_C /N_A = 0.46 \pm 0.19,$$
whereCA/CF is the ratio of the coupling strength of the triple-gluon vertex to that of gluon bremsstrahlung from quarks, andNC/NA, the ratio of the number of quark colours to the number of gluons.
20 citations
TL;DR: The tau lepton lifetime was measured using four different methods with the DELPHI detector as mentioned in this paper, and three measurements using one prong decays were combined, accounting for correlations, resulting in ττ=298 ±7 (stat.)±4 (syst.) fs.
17 citations
TL;DR: In this article, the B0−View the MathML source0 mixing was studied by using about 250 000 hadronic decays of the Z0, collected with the DELPHI detector at LEP.
13 citations
01 Aug 1993
TL;DR: One quarter of the Forward Ring Imaging Cherenkov (Forward RICH) detector has been installed and operated in the DELPHI experiment as mentioned in this paper, covering the forward-backward regions (15 degrees >
Abstract: One quarter of the Forward Ring Imaging Cherenkov (Forward RICH) detector has been installed and operated in the DELPHI experiment. The detector covers the forward-backward regions (15 degrees >
6 citations
22 Jul 1993
TL;DR: The Forward Ring Imaging Cherenkov detector of the DELPHI experiment at LEP provides hadron identification at polar angles 15° < θ < 35° and 145° < ǫ < 165°.
Abstract: The Forward Ring Imaging Cherenkov detector of the DELPHI experiment at LEP provides hadron identification at polar angles15° < θ < 35° and 145° < θ < 165°. Two radiator media, a layer of liquid C6F14 and a volume of gaseous C4F10, in combination provide coverage of momenta up to 40 GeV/c. A single array of photosensitive Time Projection Chambers registers the impact points of ultraviolet photons from both radiators. The design of the detector and of its readout system is described. First results obtained with a partly installed detector are reported.
3 citations