Forward Particle Production Research Articles

Particle production in very-high-energy cosmic-ray emulsion chamber events: Usual and unusual events.

We show that a simple scaling model of very forward particle production, consistent with accelerator and air shower data, can describe the overall features of the very-high-energy interactions recorded with emulsion chambers. The rapidity and transverse momentum distribution of the secondaries are quantitatively reproduced. This is somewhat surprising after numerous claims that the same data implied large scaling violations or new dynamics. Interestingly, we cannot describe some of the Centauro events, suggesting that these events are anomalous independently of their well-advertised unusual features such as the absence of neutral secondaries.

Forward particle production in π− p andK − p collisions at 58 GeV/c and comparison with quark models

We present single inclusive π±, π0 andK ± spectra in the forward fragmentation region (x>0.2,p T <1.5 GeV/c) as well as correlations between two charged particles. The data were recorded in an unseparated negative hadron beam at the CERN SPS using a large acceptance forward spectrometer. Our maasurements are compared in detail with several models which emphasise the role of the beam valence quarks in this production process. The connection to measurements at largep T is also investigated.

Study of Diquark Fragmentation at the CERN Intersecting Storage Rings

Forward particle production in $\mathrm{pp}$ interactions triggered by a 30\ifmmode^\circ\else\textdegree\fi{} pion of momentum exceeding 5 GeV/c has been studied at c.m. energy of 63 GeV. Quantum-chromodynamic model calculations show that in a majority of such interactions the incident proton loses a valence quark. Results indicate that hadronization of diquarks is primarily a recombination process leading to the formation of a high-$x$ baryon.