Scalar and tensor resonances in $$J/\psi $$ radiative decays

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

doi:10.1140/epjc/s10052-022-10014-8

Cited by 28 publications

(19 citation statements)

References 120 publications

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“…In the literature, the K-matrix is regularly used in the spectroscopy of hadrons containing u, d and s quarks, for example in studies of scalar mesons in Refs. [18][19][20]. A first application of a K-matrix in the analysis of heavy quarkonia was made by Uglov et al [21], performing a unitary coupled channel analysis of e + e − annihilation to the D D, D * D and D Dπ channels for energies up to 4.7 GeV.…”

Section: Introductionmentioning

confidence: 99%

K-matrix Analysis of $e^+e^-$ Annihilation in the Bottomonium Region

Hüsken¹,

Mitchell²,

Swanson³

2022

Preprint

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We perform the first global and unitary analysis of e + e − → b b cross sections. We analyze exclusive cross sections in the B B, B * B(+c.c.), B * B * , B * s B * s , Υ(nS)π + π − and h b (nP )π + π − channels as well as the total inclusive cross section for b b production. Pole positions and residues are determined for four vector states, which we associate with the Υ(4S), Υ(10750), Υ(5S) (or Υ(10860)), and Υ(6S) (or Υ(11020)). We find strong evidence for the new Υ(10750) recently claimed by Belle, although with parameters not well constrained by the data. Results presented here cast doubt on the validity of branching ratios reported earlier using Breit-Wigner parameterizations or ratios of cross sections. We also compare our results with a selection of theoretical calculations for the vector bottomonium spectrum.

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Section: Introductionmentioning

confidence: 99%

K-matrix Analysis of $e^+e^-$ Annihilation in the Bottomonium Region

Hüsken¹,

Mitchell²,

Swanson³

2022

Preprint

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“…Glueballs and hybrid states may show their traces in some more confirmed ways. The production rates of the f 0 (1710) in the gluon-rich processes J/ψ → γKK/ππ/ηη are one order of magnitude larger than those of the f 0 (1500) [44][45][46]. In addition, The suppressed decay rate of the f 0 (1710)…”

Section: B Gluonic Excitationsmentioning

confidence: 95%

“…While quenched lattice simulations can make clear predictions for the glueball spectrum [40][41][42], the mixing of schemes in the presence of light quarks is a challenge [43]. The production property suggests the f 0 (1710) is largely overlapped with a scalar glueball [44][45][46]. However, the scalar meson sector is the most complex one and the interpretation of the state's nature and nonet assignments are still very controversial.…”

Section: Light Hadronsmentioning

confidence: 99%

Hadron spectroscopy at STCF

Guo¹,

Peng²,

Xie³

et al. 2022

Preprint

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I. INTRODUCTIONDespite that quantum chromodynamics (QCD), the theory of strong interaction, has colorful quarks and gluons as its basic degrees of freedom, all fundamental particles participating the strong interaction that can be directly detected in experiments are colorless or color-singlet hadrons. This phenomenon is called color confinement. Because of that, the study of hadron spectroscopy is essential in improving our understanding of the nonperturbative regime of QCD and to reveal the mechanism of color confinement. The high-luminosity electron-positron collision machine under discussion, Super τ -Charm Facility (STCF), can play an essential role in hadron spectroscopy by discovering new hadron resonances and measuring properties of known hadrons with an unprecedented precision. In the following, we will discuss briefly the topics on hadron spectroscopy that will be investigated at STCF. II. PHYSICS LANDSCAPE A. Highly excited charmonia and charmonium-like statesCharmonium states being bound states of a charm and an anticharm quark were supposed to be well described by nonrelativistic potential quark models [1,2]. This was the case before 2003.Since the discovery of the X(3872), also known as χ c1 (3872), by Belle in 2003 [3], there have been a large number of new resonance(-like) structures observed in the charmonium mass region by various experiments, including BESIII, BaBar, Belle, CDF, D0, ATLAS, CMS and LHCb (see e.g.

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“…The J/ψ radiative decays to π 0 π 0 and K 0 S K 0 S were measured with high precision by BESIII [25,26]. The partial waves have been analyzed by JPAC according to the bottom-up philosophy mentioned earlier [18]. To assess the model dependence realistically, results were given for 14 different amplitude parametrizations respecting the S-matrix principles as much as possible.…”

Section: A the Light Sectormentioning

confidence: 99%

Snowmass white paper: Need for amplitude analysis in the discovery of new hadrons

Albaladejo¹,

Battaglieri²,

Bibrzycki³

et al. 2022

Preprint

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We highlight the need for the development of comprehensive amplitude analysis methods to further our understanding of hadron spectroscopy. Reaction amplitudes constrained by first principles of S-matrix theory and by QCD phenomenology are needed to extract robust interpretations of the data from experiments and from lattice calculations.In the last two decades, high-energy physics experiments have delivered a lot of unexpected exotic hadron resonances, that challenge the minimal quark model lore of baryons with three quarks and mesons with a quark-antiquark pair. Candidates for tetraquarks, pentaquarks, molecules, and hadrons with gluonic degrees of freedom have been found [1,2]. Establishing the existence of isolated resonances that go beyond the minimal quark model is just the first step: one needs to identify the complete multiplets and study the differences and similarities among their members. This

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Scalar and tensor resonances in $$J/\psi $$ radiative decays

Abstract: We perform a systematic analysis of the $$J/\psi \rightarrow \gamma \pi ^0\pi ^0$$ J / ψ → γ π 0 π 0 and $$\rightarrow \gamma K_S^0 K_S^0$$ → … Show more

Cited by 28 publications

References 120 publications

K-matrix Analysis of $e^+e^-$ Annihilation in the Bottomonium Region

K-matrix Analysis of $e^+e^-$ Annihilation in the Bottomonium Region

Hadron spectroscopy at STCF

Snowmass white paper: Need for amplitude analysis in the discovery of new hadrons

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