R. S. Raghavan

Inclusive production of non-strange mesons in pp annihilations

Abstract A study of the inclusive production of π − , η , ϱ 0 , ω ad f mesons in p p annihilation at 0.7 GeV/ c is presented. Topological and channel cross sections are determined. Longitudinal and transversal momentum distributions of non-strange mesons are studied. It is deduced that nearly 48% of all negative pions arise from the decay of η , ϱ 0 , ω and f mesons.

Study of the D(1285) and E(1420) resonances produced in pp annihilations at 700–760 MeV/c

In this paper we have investigated the properties of the D(1285) and E(1420) meson resonances using the five-body annihilation channels pp → KKπππ obtained in a large statistics experiment (28 events/μb). The analysis favours the 1+ spin-parity assignment for the D(1285) meson. The dominant decay mode of the D(1285) into KKπ is found to be δ(970)π. The situation concerning the E(1420) meson remains confused although not inconsistent with previous analyses. Partial cross sections on resonance production are also presented.

A new experimental determination of the K ∗ (890) electromagnetic mass difference

Abstract The copious and simultaneous production of K∗0(890) and K∗±(890) in the final states p p → K S 0 K ± π ∓ (6453 events) has been used to evlauate the electromagnetic mass splitting between the neutral and charged modes of the K∗(890). The new measurement is in good agreement with previous determinations and inconsistent with recent implications for hadron spectroscopy based on the standard gauge model. A brief discussion of this discrepancy is presented.