Observation of centrally produced θ/f2(1720) in the reaction pp→pf(Kanti K)ps at 300 GeV/c

Citation

Armstrong TA, Benayoun M, Beusch W, Bloodworth IJ, Carney JN, Childs R, Evangelista C, French BR, Ghidini B, Girone M, Jacholkowski A, Kahane J, Kinson JB, Kirk A & Woodward J (1989) Observation of centrally produced θ/f2(1720) in the reaction pp→pf(Kanti K)ps at 300 GeV/c. Physics Letters B, 227 (1), pp. 186-190. https://doi.org/10.1016/0370-2693%2889%2991305-1

Abstract
The K+K- and KS0KS0 systems centrally produced in the reaction ρρ→ρfΚΚρs have been studied at 300 GeV/c incident momentum. Both the K+K- and the KS0KS0 mass spectra show large resonant production. For the first time in hadron collisions, clear evidence is found for the Θ⁄ ƒ2(1720)with parameters m=1713±10 MeV, Γ=181±30 MeV for the K+K- decay mode and m=1706±10 MeV, Γ=104±30 MeV for the KS0KS0 decay mode. A spin analysis of the K+K- spectrum shows that for the Θ⁄ ƒ2(1720)jP=2+ is strongly favoured while 0+ and 1- are excluded.

Notes
Additional co-authors: K. Knudson, V. Lenti, Ph. Leruste, A. Malamant, J.L. Narjoux, F. Navach, A. Palano, E. Quercigh, N. Redaelli, L. Rossi, M. Sené, M. Stassinaki, M.T. Trainor, G. Vassiliadis, O. Villalobos Baillie, M.F. Votruba

Journal
Physics Letters B: Volume 227, Issue 1