Scalar and tensor resonances in $J/ψ$ radiative decays

Rodas, A.; Pilloni, A.; Albaladejo, M.; Fernández-Ramírez, C.; Mathieu, V.; Szczepaniak, A.P.

doi:10.48550/arxiv.2110.00027

Cited by 8 publications

(13 citation statements)

References 94 publications

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“…The clear identification of these QCD exotics would validate and advance our quantitative understanding of QCD. Radiative decays of the J/ψ meson provide a gluon-rich environment and are therefore regarded as one of the most promising hunting grounds for gluonic exciations [1][2][3][4].…”

mentioning

confidence: 99%

Observation of an isoscalar resonance with exotic $J^{PC}=1^{-+}$ quantum numbers in $J/ψ\rightarrowγηη'$

Ablikim¹,

Achasov²,

Adlarson³

et al. 2022

Preprint

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Using a sample of (10.09±0.04)×10 9 J/ψ events collected with the BESIII detector operating at the BEPCII storage ring, a partial wave analysis of the decay J/ψ → γηη ′ is performed. The first observation of an isoscalar state with exotic quantum numbers J P C = 1 −+ , denoted as η1(1855), is reported in the process J/ψ → γη1(1855) with η1(1855) → ηη ′ . Its mass and width are measured to be (1855±9 +6−1 ) MeV/c 2 and (188±18 +3 −8 ) MeV, respectively, where the first uncertainties are statistical and the second are systematic, and its statistical significance is estimated to be larger than 19σ.

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mentioning

confidence: 99%

Observation of an isoscalar resonance with exotic $J^{PC}=1^{-+}$ quantum numbers in $J/ψ\rightarrowγηη'$

Ablikim¹,

Achasov²,

Adlarson³

et al. 2022

Preprint

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“…The constructive interference in ππ and the destructive interference in K K requires interference between octet and singlet amplitudes. The fit of Rodas et al [4] to the data on radiative J/ψ decay into ππ and K K (without constraints from ππ scattering) did not include f 0 (1370). Consequently, the minimum at 1500 MeV in the K K mass distribution was not well reproduced.…”

Section: Decaymentioning

confidence: 99%

“…In an analysis of radiative J/ψ decays constrained by a large number of further data, ten scalar isoscalar resonances were reported [3]. A recent analysis of the data on radiative J/ψ decays -without constraints from further data like ππ elastic and inelastic scattering -confirmed four of them [4]. The flavor content of the two lightest isoscalar mesons was studied by Oller [5] (see also [6]) by a fit to the two-meson residues.…”

Section: Introductionmentioning

confidence: 99%

Singlet-octet-glueball mixing of scalar mesons

Klempt,

Sarantsev

2021

Preprint

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The mixing angles between scalar isoscalar resonances and a scalar glueball are determined from their decays into two pseudoscalar mesons. For f 0 (1370) and f 0 (1500), at most a small glueball component is admitted by the data. The decay modes of f 0 (1710), f 0 (1770), f 0 (2020), and f 0 (2100) require significant glueball fractions. Above this mass, the errors in the decay frequencies become too large to extract a glueball component. The summation of all observed glueball fractions up to 2100 MeV yields (78±18)%. The glueball fractions as function of the mass are consistent with a scalar glueball at 1965 MeV and a width of 370 MeV as suggested by a measurement of the yield of scalar isoscalar mesons in radiative J/ψ decays.

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“…While the quark model describes conventional mesons as bound states of quarks and antiquarks, lattice QCD (LQCD) and QCD-motivated models predict a more rich spectrum of mesons that includes bound states with gluonic degrees of freedom, such as glueballs and hybrids. Radiative decays of the J/ψ meson provide a gluon-rich environment and are therefore regarded as one of the most promising hunting grounds for gluonic exciations [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Partial wave analysis of $J/ψ\rightarrowγηη'$

Ablikim,

Achasov,

Adlarson

et al. 2022

Preprint

View full text Add to dashboard Cite

Based on a sample of (10.09±0.04)×10 9 J/ψ events collected with the BESIII detector operating at the BEPCII storage ring, a partial wave analysis of the decay J/ψ → γηη ′ is performed. An isoscalar state with exotic quantum numbers J P C = 1 −+ , denoted as η1(1855), has been observed for the first time with statistical significance larger than 19σ. Its mass and width are measured to be (1855±9 +6−1 ) MeV/c 2 and (188±18 +3 −8 ) MeV, respectively. The product branching fraction B(J/ψ→γη1(1855)→γηη ′ ) is measured to be (2.70±0.41 +0.16 −0.35 )×10 −6 . The first uncertainties are statistical and the second are systematic. In addition, an upper limit on the branching ratio B(f0(1710)→ηη ′ )/B(f0(1710)→ππ) is determined to be 1.61 × 10 −3 at 90% confidence level, which lends support to the hypothesis that the f0(1710) has a large glueball component.

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Scalar and tensor resonances in $J/ψ$ radiative decays

Cited by 8 publications

References 94 publications

Observation of an isoscalar resonance with exotic $J^{PC}=1^{-+}$ quantum numbers in $J/ψ\rightarrowγηη'$

Observation of an isoscalar resonance with exotic $J^{PC}=1^{-+}$ quantum numbers in $J/ψ\rightarrowγηη'$

Singlet-octet-glueball mixing of scalar mesons

Partial wave analysis of $J/ψ\rightarrowγηη'$

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