Two-BodyBMeson Decays toηandη′: Observation of

Estimation of upper limits using a Poisson statistic

“…This technique is applied, for instance, to estimate upper limits in rare B decay studies [23,24]. It is important to realize that the integration of the likelihood implicitly uses the Bayesian approach.…”

Constituent quarks and g 1

“…CLEO has measured the hard form-factors for the processes η → γγ * and η ′ → γγ * [83]. They have also observed strikingly large branching ratios for B decays into an η ′ and additional hadrons [84] 5 which may [85] be related to the axial anomaly. When combined with polarised deep inelastic scattering, these experiments on η and η ′ production and decay, provide complementary windows on the role of gluons in dynamical chiral symmetry breaking.…”

“…One finds B(B → η ′ X) = (6.2 ± 1.6 ± 1.3)x10 −4 under the constraint 2.0 < p η ′ < 2.7GeV/c[84]. Exclusive B → η ′ K decays have been observed with branching ratios B(B + → η ′ K + ) = (6.5 +1.5 −1.4 ± 0.9)x10 −5 and B(B 0 → η ′ K 0 ) = (4.7 +2.7 −2.0 ± 0.9)x10 −5 .…”

η′meson production in proton-proton collisions

“…The η ′ meson is thought to couple strongly to gluons via the QCD anomaly coupling η ′ → g + g [1]. Also, an unexpectedly large branching ratio measured recently for the inclusive decay of beauty particles, B → η ′ + X [2] has been interpreted as possible evidence for the strong coupling of η ′ meson to the gluonic components [3]. It would then be conceivable that the pp → ppη ′ reaction might probe the gluon content of the η ′ meson via its coupling to gluons emitted from the quarks exchanged between two interacting nucleons.…”