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• W1979789353 abstract "Using our high-statistics data from the πp → ππn reaction, we have remade a model-independent partial-wave analysis in finer mass bins at low four-momentum transfer. The Breit-Wigner fits to the leading waves yield mρ = (777.4 ± 2.0) MeV and Γρ = (160P+4.1−4.0) MeV, as well as mf = (1273.3 ± 2.3) MeV, Γf = (179.2 +6.9−6.6) MeV and xf = (84.9 ± 2.5)%. The last two parameters yield Γ(f → ππ) = (152.1 ± 7.3) MeV, a value which is higher than the one resulting from fits to the decays of the JPC = 2++ mesons. On the basis of a smaller discrepancy, Rosner has speculated about a non-qq admixture (possibly gg) in the f(1270), i.e. |f(1270)〉 = |qq〉cos θ + |gg〉sin θ. Repeating his fits with more recent data we obtain a considerably more significant effect with sin2θ = 0.18 ± 0.04. This sets a mass of an orthogonal state |fT〉 = − |qq〉sinθ + |gg 〉cosθ between 1420 and 1620 MeV. The fT could be identified with a 1440 MeV state seen in some KK experiments, A1 exchange being a possible production mechanism. A fit to our polarized target K+K− data at ∼ 18 GeV/c yields m(fT) = (1445 +20−19) MeV and Γ (fT = (81+52−25) MeV." @default.
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• W1979789353 date "1983-08-01" @default.
• W1979789353 modified "2023-10-18" @default.
• W1979789353 title "Experimental indications for a 2++ non-q object" @default.
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• W1979789353 doi "https://doi.org/10.1016/0550-3213(83)90088-3" @default.
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