φ production in annihilation at rest

Measurements of the reaction p̄p→φη of antiproton annihilation at rest at three hydrogen target densities

“…, a value not far from our experimental results (9)(10)(11)(12). However, these approaches could predict neither the observed spin dependence of the φπ 0 final state nor the spin dependence of the φη channel.…”

“…(13) with B.R. from (9)- (12). The upper numbers correspond to the P-wave fraction calculated with the parameters of [7] and the lower numbers correspond to the parameters of [11].…”

“…It is in good agreement with our result for annihilation in liquid shown in Table 2 and Table 4. [3] 0.66 ± 0.19 liquid target [12] 0.37 ± 0.09 gas at NTP [12] 0.41 ± 0.16 gas at NTP, LX-trigger [4] 1.04 ± 0.33 ± 0.05 gas at NTP, upper limit [4] 0.74 ± 0.22 ± 0.03 gas at NTP, lower limit…”

“…The ASTERIX collaboration [12] measured the φη channel for antiproton annihilation in a gas target at NTP. Beside it the yield of (2) was measured with the so-called LX-trigger, which enriched the data sample with P-wave annihilation events.…”

Photoproduction ofφmesons from the proton: Polarization observables and strangeness in the nucleon

“…One example is φ production in proton-anti-proton annihilation. Recent experiments on vector meson production through pp annihilation at rest [17][18][19] report a strong violation of the OZI rule. It can be accounted for by the presence of an intrinsic ss component in the nucleon wave function [8,20], which contributes to the process through the rearrangement and shake-out diagrams [21][22][23][24].…”