J/Ψ decays

may be attributed to mixing between the glueball and the ss radial excitation.The latter is pushed down in mass by repulsion between the two levels. We conjecture that the 2 + glueball may likewise be broad. Mixing between it and the 2 3 P 2 qq and ss radial excitation can explain the appearance of f 2 (1565) and a 2 + Θ(1710) at masses lower than anticipated. Mixing with higher qq states can explain the 2 + resonance at 1920 MeV and also φφ signals observed by Etkin et al. and by the JETSET collaboration.

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“…[15] and Mark III [13]. Our fit lies well above DM2 results, but agrees fairly well with Mark III, Fig.…”

supporting

confidence: 89%

A new view of the 0− and 2+ glueballs

Buggs

Zou

1997

Physics Letters B

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“…For reactions (1) and (3), we consider only events for which the number of well-measured charged-particle tracks with transverse momenta greater than 0.1 GeV=c is exactly equal to two. For reaction (2), we require the number of well-measured charged-particle tracks to be exactly equal to four.…”

Section: Event Reconstruction and Data Selectionmentioning

confidence: 99%

“…Charmonium decays, in particular J=ψ radiative and hadronic decays, have been studied extensively [1,2]. One of the motivations for these studies is the search for non-qq mesons such as glueballs or molecular states that are predicted by QCD to populate the low mass region of the hadron mass spectrum [3].…”

Section: Introductionmentioning

confidence: 99%

Dalitz plot analysis ofηc→K+K−ηand
Lees¹,
Poireau²,
Tisserand³
et al. 2014
Phys. Rev. D

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We study the processes γγ → K þ K − η and γγ → K þ K − π 0 using a data sample of 519 fb −1 recorded with the BABAR detector operating at the SLAC PEP-II asymmetric-energy e þ e − collider at center-of-mass energies at and near the ϒðnSÞ (n ¼ 2; 3; 4) resonances. We observe η c → K þ K − π 0 and η c → K þ K − η decays, measure their relative branching fraction, and perform a Dalitz plot analysis for each decay. We observe the K Ã 0 ð1430Þ → Kη decay and measure its branching fraction relative to the Kπ decay mode to be RðK Ã 0 ð1430ÞÞ ¼ BðK Ã 0 ð1430Þ→KηÞ BðK Ã 0 ð1430Þ→KπÞ ¼ 0.092 AE 0.025 þ0.010 −0.025 . The η c → K þ K − η and K Ã 0 ð1430Þ → Kη results correspond to the first observations of these channels. The data also show evidence for η c ð2SÞ → K þ K − π 0 and first evidence for η c ð2SÞ → K þ K − η.

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“…† Different accelerator has different energy resolution, and their difference is sometimes large [11]. Here ∆ = 1.3 MeV corresponds to the energy resolution of BEPC/BES [12] at the ψ(2S) energy region; and ∆ = 2.0 MeV corresponds to DORIS/DASP at the same energy.…”

Section: The Experimentally Observed Cross Sectionmentioning

confidence: 99%