During the last 1995 data acquisition period at LEP, the DELPHI experiment collected an integrated luminosity of 5.9 pb(-1) at centre-of-mass energies of 130 GeV and 136 GeV. Radiative leptonic ...events (e, mu, tau) With high energy photons were studied and
The TRIPLEX, a 128 channel integrated circuit, intended for use with the DELPHI Si-strip microvertex detector is described. It includes a sensitive differential discriminator per channel for ...participation in the DELPHI trigger. The discriminators, which compare sampled signals from before and after beam crossing, are servo-stabilized between beam crossings to provide uniform thresholds. The preamplifier noise (90 electrons+8 electrons per pF for a 1.5 microsecond peaking time) is compatible with a trigger threshold of less than 1/4 MIP. The 128 discriminator outputs are connected in wired-OR to the trigger output. An automatic mechanism is included to disconnect noisy channels from the trigger.< >
This paper presents results on charged Higgs boson production, based on LEP data collected at root s = 172 GeV, that complement the previous DELPHI results obtained at centre of mass energies up to ...161 GeV. The charged Higgs bosons are assumed to be pair
We have investigated the elastic scattering of high energy Σ− off electrons from carbon and copper targets using the CERN hyperon beam. Scattering events are identified using a maximum likelihood ...technique exploring the kinematical relations of the scattered particles. The observed Q2–distribution of these events suggests a mean square charge radius of the Σ− of (Σ−)=0.91±0.32(stat.)±0.4 (syst.) fm2. This constitutes the first measurement of (Σ−) and demonstrates the possibility to also measure the charge radii of other hyperons. (Springer)
A search for pair production of the lightest chargino at root-s = 130.4 and 136.3 GeV has been carried out using the data sample corresponding to the 5.92 pb(-1) recorded by the DELPHI detector ...during the high energy run of LEP in the last period of 1995.
We report on a measurement of the inclusive production cross sections for Σ±, Σ±1385, Σ±1660 and Σ¯−1385 in the CERN hyperon beam experiment WA89, using a Σ−/π− beam of 345 GeV/c momentum and ...neutrons of 260 GeV/c mean momentum. A strong leading particle effect was observed for all negative Σ and Σ∗. The results are compared with predictions from phenomenological models. (Springer)
A search with the DELPHI detector at LEP for excited leptons (e*, mu*, tau* and nu*) decaying through gamma, W or Z transitions is reported. The data used correspond to an integrated luminosity of 10 ...pb(-1) e(+)e(-) centre-of-mass energy at an e of 161 Ge
Oscillations of B(s)(0)mesons were studied in events with a large transverse momentum lepton selected from 3.2 million hadronic Z(0) decays registered by DELPHI between 1991 and 1994. A limit on the ...mass difference between the physical B-s(0) states Delta
A search for fully reconstructed \lb beauty baryons is performed using about 3 million Z decays collected with the DELPHI detector at LEP. The analysis relies on the combined use of the accurate ...tracking and of the hadron identification capabilities of DELPHI. A total of four events has been found, three in the \lc\ppm channel and one in the \lc\a1m channel over a small background. The \lb beauty baryon mass is measured to be (~ 5668 \pm 16~ ({\rm stat.}) \pm 8~({\rm syst.})~)~ \mv.
Analysis of the rapidity structure of charge correlations in hadronic events from Z(0) decays gives evidence for chain-like charge-ordering of particle production along the thrust axis, as predicted ...by 'QCD-motivated' string-like fragmentation models. (C)
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