S. Eidelman

Bose-Einstein correlations in αα, pp and pp interactions

Abstract Bose-Einstein correlations between pions produced in the central region of rapidity in αα, pp and p p interactions have been studied at the ISR. The parameters r and τ c -often interpreted as the radius and depth of the π-emitting region - are found to be independent of incident particle type but to depend on the mean charged multiplicity. In high multiplicity events, the pions appear to originate from a larger space-time region.

The dominance of jets at large transverse energy in a full-azimuth hadron calorimeter at ISR energies

Abstract Events with a large transverse energy in a calorimeter with full azimuthal coverage and |y|

A comparison of direct photon, π0 in pp and pp interactions at the CERN ISR

Abstract We have measured the production of direct photons, π 0 s, and ηs in p p and pp collisions at √ s =53 GeV in the range 2≈ p T ≈6 GeV/ c for the central rapidity region | y | 0.4. No statistically significant difference between pp and pp interactions is observed.

Production of prompt positrons at low transverse momentum in 63 GeV pp collisions at the CERN intersecting storage rings

Abstract The production of inclusive prompt positrons in pp collisions at √ s = 63 GeV and θ cm = 90° has been measured over the p T interval 0.08 T GeV c . The e / π ratio rises from ∼ 2 × 10 −4 at p T = 0.9 GeV c to ∼ 1 × 10 −3 at p T = 0.1 GeV c . This is a factor of 6 higher than would be expected from the sum of hadronic bremsstrahlung and the semileptonic decay of charm.

The production of prompt positrons at low transverse momentum increases with the square of the associated charged multiplicity: Axial field spectrometer collaboration

We have measured the production of prompt positrons in pp collisions at √s = 63 GeV and y = 0 in the pT interval 0.12<pT<1.0 GeV/c. The results indicate that the production of positrons at low pT (<0.4 GeV/c) is proportional to the square of the mean multiplicity in the central region |y| < 1. Such a quadratic dependence is not expected from final-state sources such as hadronic bremsstrahlung or hadronic decays, but is natural in models where low mass electron pairs are produced by interactions of constituents created during the collision.

Bose-Einstein correlations between kaons

Abstract Bose-Einstein correlations between identical charged kaons are observed in αα, pp, and p p collisions at the CERN Intersecting Storage Rings. The average radial extension of the K-enitting region is found to be (2.4±0.9) fm.

Direct-photon plus away-side jet production inpp collisions at\(\sqrt s = 63\) GeV and a determination of the gluon distribution

AbstractWe have determined the double inclusive cross-section for opposite-side high-pT photons and away-side jets withθγ≈θjet≈90° produced inpp collisions at the CERN Intersecting Storage Rings atn

Properties of jets in high-E T events produced inpp collisions at\(\sqrt s \)=63 GeV

sqrt s = 63