Professor Brian Foster OBE, FRS: Publications

An I = 1 enhancement at a mass of 1550 MeV in the (Λπ) and (Σπ)-systems

Physics Letters B 78:1 (1978) 154-157

Authors:

C Dionisi, R Armenteros, J Diaz, P Gavillet, JB Gay, A Gurtu, RJ Hemingway, M Mazzucato, P Trepagnier, R Blokzijl, GGG Massaro, B Jongejans, J Engelen, JJ Timmermans, RT Van De Walle, B Foster, PR Lamb, WL McDowell

Abstract:

Evidence is presented for an I = 1 enhancement observed in the reactions K-p→Λ(Σ)K01K ±π∓ at 4.2 GeV c inciden momentum. The mass and width of the proposed new Y* are, respectively, (1553 ± 7) MeV) and (80 ± 30) MeV. A decay branching ratio Σπ (Σπ + Λπ) = (35 ± 12)% is also obtained. © 1978.

Backward production of the B meson in K-p interactions at 4.2 GeV c

Physics Letters B 78:1 (1978) 158-161

Authors:

P Gavillet, C Dionisi, A Gurtu, RJ Hemingway, MJ Losty, JC Marin, M Mazzucato, L Montanet, E Pagiola, R Blokzijl, B Jongejans, JC Kluyver, GGG Massaro, JJ Engelen, JSM Vergeest, M Zralek, B Foster, P Grossmann, J Wells

Abstract:

The backward production of the B(1235) meson is studied in the reaction K^-��→Σ^-π⁺ω. This reaction is observed in the final state Σ^-π⁺π⁺π^-π ⁰. A π⁺ω mass enhancement is visible in the region of the B meson for events with small |u|K^- →Σ^-) squared four-momentum transfer. The properties of the enhancement agree with those of the B meson. The cross section for K^-��→Σ^-B⁺ at 4.15 GeV c incident K^- momentum is (3.2 ± 0.5) μb. The backward production of the B meson is compared with similar baryon exchange productions of the A1 and C(Q1) axial vector mesons observed in the same experiment. © 1978.

A spin determination of the Ξ* (1820) resonance

Physics Letters B 77:4-5 (1978) 451-453

Authors:

D Teodoro, J Diaz, C Dionisi, JB Gay, RJ Hemingway, MJ Losty, M Mazzucato, R Blokzijl, GGG Massaro, H Voorthuis, WJ Metzger, JJM Timmermans, RT van de Walle, B Foster, P Grossmann, WL McDowell

Abstract:

Rare decay modes of K(1420) and K(892)

Nuclear Physics Section B 139:4 (1978) 383-393

Authors:

B Jongejans, R Blokzijl, JC Kluyver, GGG Massaro, H Voorthuis, M Cerrada, P Gavillet, RJ Hemingway, MJ Losty, JJ Engelen, WJ Metzger, CLA Pols, B Foster, L McDowell, J Wells

Abstract:

A 2.5 standard deviation signal is observed for the decay K^*-(1420) → K^*-(892)π⁺π^-. From this signal a partial width of 13.0 ± 5.0 MeV for the decay mode K^*(1420)→K^*(892)ππ is deduced under the assumption that the ππ system is in an I = 1 state. For the rare decay mode K^*(892)→Kππ no signal is observed. The following upper limits can be given for the decay widths: ΓK^*-(892) → K^-π⁺π^- < 40 keV, ΓK^*-(892) → K⁰π^-π⁰ < 35 keV, ΓK^*0(892) → K⁰π⁺π^- < 35 keV. © 1978.

Backward production of a spin-parity 1+ Kϱ resonance at 1.28 GeV

Physics Letters B 76:4 (1978) 517-522

Authors:

P Gavillet, J Diaz, C Dionisi, A Gurtu, RJ Hemingway, MJ Losty, JC Marin, M Mazzucato, L Montanet, E Pagiola, R Blokzijl, B Jongejans, GGG Massaro, H Voorthuis, JJ Engelen, W Kittel, JS Vergeest, RT van de Walle, B Foster, P Grossmann, WL McDowell

Abstract:

A (Kππ)⁺ mass enhancement is observed in the reactions K^-p → Ξ -K^o+π⁺π^o- when events with a small (K^- → Ξ^-) four momentum transfer squared are selected. The signal is also visible in the reaction K^-p → Ξ^-π⁺+ neutrals. The enhancement, centered at 1.28 GeV, is seen to decay preferentially into Kρ{variant} with spin-parity J^P = 1⁺. The cross section for K^-p→ Ξ^-C⁺(1.28) with C⁺ → Kρ{variant} at 4.15 GeV/c incident K^- momentum is (6.2 ± 0.6) μb. © 1978.

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