Interference correlations between like pions in the reactionK − p→K − pπ+π+π−π− at 8.25 GeV/c

Zeitschrift für Physik C Particles and Fields - We have observed correlations in the transverse momentum of pion pairs with like and unlike charge produced in 8.25 GeV/cK − p→K...     

General features of\bar pp interactions at 7.3 GeV/c

Absolute inclusive cross sections for \(\bar pp\) interactions at 7.3 GeV/c are given. The data cover prong cross sections,V ⁰, γ production and inclusive charged particle (p/π) production. Separation has been made into annihilation and non-annihilation components. Inclusive π⁺, π^? production in the processes of \(\bar pp\) annihilation and non-annihilation are compared with simple quark models.     

Measurement of the structure functionsF 2 andxF 3 and comparison with QCD predictions including kinematical and dynamical higher twist effects

The isoscalar nucleon structure functionsF ₂(x, Q ²) andxF ₃(x, Q ²) are measured in the range 0<Q ²<64 GeV², 1.7<W ²<250 GeV²,x<0.7 using ν and \(\bar v\) interactions on neon in BEBC. The data are used to evaluate possible higher twist contributions and to determine their impact on the evaluation of the QCD parameter Λ. In contrast to previous analyses reaching to such lowW ² values, it is found that a low \(\Lambda _{\overline {MS} } \) value in the neighbourhood of 100 MeV describes the data adequately and that the contribution of dynamical higher twist effects is small and negative.     

Resonance production and clustering effects in reactions K−p → Λ0 + pions at an incident beam momentum 8.25 GeV/c

We have estimated cross sections for the production of resonances in the reactions K^?p → Λ⁰ + pions. The data have also been analysed by a method which examines event-to-event fluctuations. Within the framework of the simple parametrization of resonance production assumed, the contribution from the resonances is insufficient to explain the observed fluctuations in the longitudinal emission of the final-state particles. These features are well reproduced by an independent cluster emission model.     

Jet analysis in Higgs search

In high energye ⁺ e ^? annihilations, events with jets dominate. Since heavy quark jets often contain undetectable neutrinos, methods of jet analysis are needed to study such events. A simple procedure is presented here and illustrated by applying to the search for the neutral Higgs bosonH ⁰ produced at LEP at the center-of-mass energy of 200 GeV.