B.S. Nilsson

Observation of single isolated electrons of high transverse momentum in events with missing transverse energy at the CERN pp collider

Abstract We report the results of a search for single isolated electrons of high transverse momentum at the CERN p p collider. Above 15 GeV/c, four events are found having large missing transverse energy along a direction opposite in azimuth to that of the high-pT electron. Both the configuration of the events and their number are consistent with the expectations from the process p + p → W ± + anything , with W→e+ν, where W± is the charged Intermediate Vector Boso postulated by the unified electroweak theory.

Evidence for Z0→e+e− at the CERN p collider

Abstract From a search for electron pairs produced in p p collisions at s = 550 GeV we report the observation of eight events which we interpret as resulting from the process p +p→Z 0 + anything, followed by the decay Z0→e++e− or Z0→e++e−+γ, where Z0 is the neutral Intermediate Vector Boson postulated by the unified electroweak theory. We use four of these events to measure the Z0 mass M Z = 91.9 ± 1.3 ± 1.4 (systematic) GeV /c 2 .

Inclusive Charged Particle Production at the CERN anti-p p Collider

Transverse momentum distributions of pions, kaons and protons have been measured around 90° in the UA2 detector at the SPS p p collider, at a CM energy of 540 GeV. All the cross sections have increased by more than a factor of 2 over those measured at ISR energies and exhibit a flatter behaviour with respect to transverse momentum.

An experimental and theoretical investigation of the structure of 210Pb

Abstract The 208 Pb(t, p) 210 Pb reaction has been performed at a bombarding energy of 20 MeV. Angular distributions using solid-state counters and a magnetic spectrograph were obtained for levels up to 5 MeV of excitation. The different transitions are interpreted in terms of multipole pair addition modes, and support for the existence of multipole pairing fields is obtained from the analysis. The data are also compared with calculations using realistic force wave functions. No new correlations from the latter calculations not already present in the multipole pairing description were found. Special attention is paid to the transition to the 3 − state at 1.869 MeV which has a large component of the two-phonon state ¦3 − ( 208 Pb) ⊗ g.s. ( 210 Pb)〉. It is shown that both ground state correlations and indirect transfer processes have to be invoked to explain the data. The two-step processes are treated in the coupled-channel Born approximation.

Measurement ofW± andZ0 properties at the CERN\(\bar pp\)p collider

AbstractA study ofW± andZ0 properties has been performed using the UA2 detector at the

Inclusive π0 production at the CERN p-p̄ collider

\bar pp

Strength of the multipole pairing coupling constant

collider. The data correspond to a total integrated luminosity of 142 nb−1 at