A coupled channel analysis of the centrally produced K+K− and π+π− final states in pp interactions at 450 GeV/c

Barberis, D.; Binon, Freddy; Close, Frank; Danielsen, K.M.; Donskov, S.V.; Earl, B.C.; Evans, D.; French, B. R.; Hino, T.; Inaba, S.; Jachołkowski, A.; Jacobsen, T.; Khaustov, G.V.; Kinson, J.B.; Kirk, A.; Кондашов, А. А.; Lednev, A.A.; Lenti, V.; Minashvili, I. A.; Peigneux, Jean Pierre; Romanovsky, V.; Russakovich, N.; Semenov, A.; Shagin, P.; Shimizu, H.; Singovsky, A.V.; Sobol, A.; Stassinaki, M.; Stroot, Jean-Pierre; Takamatsu, K.; Tsuru, T.; Baillie, O. Villalobos; Votruba, M.F.; Yasu, Y.

doi:10.1016/s0370-2693(99)00909-0

Cited by 98 publications

(99 citation statements)

References 14 publications

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“…The χ 2 for ππ data is 28.7 for 29 degrees of freedom. The Omega collaboration reports a significant contribution from f 0 (1370) to their data on central production of π + π − [30]. Their fitted mass and width agree closely with the line-shape fitted to f 0 (1370) in [5].…”

Section: Proposed Modification To Eusupporting

confidence: 58%

Experimental disagreements with extended unitarity

Bugg

2008

Eur. Phys. J. C

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Abstract. In production processes, e.g. J/Ψ → ωππ orpp → 3π, the σ and f 0 (980) overlap in the same partial wave. The conjecture of extended unitarity (EU) states that the ππ pair should have the same phase variation as ππ elastic scattering. This is an extension of Watson's theorem beyond its original derivation, which stated only that the s-dependence of a single resonance should be universal. The prediction of EU is that the deep dip observed in ππ elastic scattering close to 1 GeV should also appear in production data. Four sets of data disagree with this prediction. All require different relative magnitudes of σ and f 0 (980). That being so, a fresh conjecture is to rewrite the 2-body unitarity relation for production in terms of observed magnitudes. This leads to a prediction different to EU. Central production data from the AFS experiment fit naturally to this hypothesis.

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Section: Proposed Modification To Eusupporting

confidence: 58%

Experimental disagreements with extended unitarity

Bugg

2008

Eur. Phys. J. C

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“…From the Particle Data Group [27], B(J/ψ → γf 0 (1710) → γKK) = (8.5 +1.2 −0.9 ) × 10 −4 . Combining with the WA102 measurements [29]: B(f 0 → ππ)/Γ(f 0 → KK) = 0.20 ± 0.04 and Γ(f 0 → ηη)/Γ(f 0 → KK) = 0.48 ± 0.15 yields B(J/ψ → γf 0 (1710)) ∼ 1.4 × 10 −3 . For f 0 (1500), the BES result B(J/ψ → γf 0 (1500) → γππ) = (6.7 ± 2.8) × 10 −5 [31] together with B(f 0 (1500) → ππ) = 0.349 ± 0.023 [27] gives B(J/ψ → γf 0 (1500)) = (2.9 ± 1.2) × 10 −4 .…”

Section: Numerical Resultsmentioning

confidence: 59%

“…ρ KK s = ρ ππ s , then it is expected that Γ(G → ππ)/Γ(G → KK) = 0.91. Since Γ(f 0 (1710) → ππ)/Γ(f 0 (1710) → KK) is measured to be 0.20 ± 0.04 by WA102 [29], < 0.11 by BES from J/ψ → ω(K + K − , π + π − ) decays [30] and 0.41 +0.11 −0.17 from J/ψ → γ(K + K − , π + π − ) decays [31], 5 this implies a relatively large suppression of ππ production relative to KK in scalar glueball decays if f 0 (1710) is a pure 0 ++ glueball. To explain the large disparity between ππ and KK production in scalar glueball decays, Chanowitz [32] advocated that a pure scalar glueball cannot decay into quark-antiquark in the chiral limit, i.e.…”

Section: Su(3) Breaking and Chiral Suppressionmentioning

confidence: 99%

Scalar glueball, scalar quarkonia, and their mixing

2006

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The isosinglet scalar mesons f 0 (1710), f 0 (1500), f 0 (1370) and their mixing are studied. We employ two recent lattice results as the starting point; one is the isovector scalar meson a 0 (1450) which displays an unusual property of being nearly independent of quark mass for quark masses smaller than that of the strange, and the other is the scalar glueball mass at 1710 MeV in the quenched approximation. In the SU(3) symmetry limit, f 0 (1500) turns out to be a pure SU(3) octet and is degenerate with a 0 (1450), while f 0 (1370) is mainly an SU(3) singlet with a slight mixing with the scalar glueball which is the primary component of f 0 (1710). These features remain essentially unchanged even when SU(3) breaking is taken into account. We discuss the sources of SU(3) breaking and their consequences on flavor-dependent decays of these mesons. The observed enhancement of ωf 0 (1710) production over φf 0 (1710) in hadronic J/ψ decays and the copious f 0 (1710) production in radiative J/ψ decays lend further support to the prominent glueball nature of f 0 (1710).

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“…The absence of f 0 (1710) in our data is therefore compatible with an ss assignment. Recent results in central production 5 show that f 0 (1710) prefers to decay into KK rather than into ππ. This also points to an ss interpretation of the f 0 (1710) and therefore suggests that this meson is the (mainly) ss member of the scalar nonet.…”

Section: Discussionmentioning

confidence: 99%

“…In the literature the narrow f 0 (1500) and f 0 (1710) compete for being the ground state glueball. Recent data inpp annihilation and in central production show that both the f 0 (1370) and f 0 (1500) couple mainly to pions 4,5 while f 0 (1710) couples mainly to kaons 5 . I will show that f 0 (1710) is dominantly ss.…”

Section: Introductionmentioning

confidence: 99%

Meson Resonances in Proton-Antiproton Annihilation

Amsler¹

2002

Photon 2001

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Crystal Barrel data for proton-antiproton annihilation in flight at 900 MeV/c are presented. The channels pp → 3π 0 , π 0 π 0 η and π 0 ηη are used to search for isoscalar 0 ++ and 2 ++ mesons in the mass range 1500 − 2000 MeV. Both 3π 0 and π 0 ηη data sets require an isoscalar 2 ++ resonance decaying into π 0 π 0 and ηη with mass M = (1867 ± 46) MeV and width Γ = (385 ± 58) MeV. The analysis of π 0 π 0 η leads to an isovector 2 ++ state decaying into π 0 η with mass M = (1698 ± 44) MeV and width Γ = (265 ± 55) MeV. The 3π 0 and π 0 ηη data do not show any f 0 (1710). This adds supportive evidence that this meson is mainly ss.

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A coupled channel analysis of the centrally produced K+K− and π+π− final states in pp interactions at 450 GeV/c

Cited by 98 publications

References 14 publications

Experimental disagreements with extended unitarity

Experimental disagreements with extended unitarity

Scalar glueball, scalar quarkonia, and their mixing

Meson Resonances in Proton-Antiproton Annihilation

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