The experimental status of glueballs

Credé, V.; Meyer, C. A.

doi:10.1016/j.ppnp.2009.03.001

Cited by 222 publications

(214 citation statements)

References 211 publications

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“…For a review see Ref. [3]. Detailed studies are lacking above this mass region and it is now being studied to search for other glueball configurations.…”

Section: Landscapementioning

confidence: 99%

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The light meson spectroscopy program

Smith

2014

EPJ Web of Conferences

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Abstract. Recent discoveries of a number of unexpected new charmomium-like meson states at the BaBar and Belle B-factories have demonstrated how little is still known about meson spectroscopy. In this talk we will review recent highlights of the light quark spectroscopy from collider and fixed target experiments. LandscapeWithin the quark model, mesons are described as hadrons with the simplest configuration of a quark and anti-quark pair (qq). This model has been surprisingly successful in explaining the main features of the spectrum despite the fact that mesons are bound states of the complex theory of QCD, which allows for intricate configurations of gluons, quarks and anti-quarks. The simple features of a qq system are exhibited more strongly for heavy quark systems, e.g. charm and bottom mesons. However, even there recent discoveries are shinning light on a rich spectrum, unexpected even a few years ago.Much of the experimental interest in the light meson spectrum is focused on configurations outside the naive quark model, i.e. glueballs (valence gluons only), multi-quark systems and hybrids (valence quarks and gluons). We begin by exploring the mass region around 2 GeV using J/ decays (Sect. 2). The spectrum of 0 ++ mesons is shown in Fig. 1. There has been a long interesting history to understand the nature of these states, as described in the recent review in Ref. [1]. The grouping of mesons below 1 GeV does not fit easily into the quark model and has for many years been considered a likely set of multi-quark configurations (see for example Ref. [2]). The grouping of states between 1.5 and 1.7 GeV consists mostly of quark-model states, but one too many states together with studies of the decay modes have lead investigators to posit that there is also a glueball that is mixed with the qq states. For a review see Ref. [3]. Detailed studies are lacking above this mass region and it is now being studied to search for other glueball configurations.We then turn our attention to fixed target experiments with pion (Sect. 3) and photon (Sect. 4) beams to study the production of hybrid states. The gluonic fields that confine quarks have been shy to manifest their presence in static properties of hadrons, though their degrees of freedom are present in the QCD Lagrangian. However, a subset of hybrids have an unmistakable experimental signature: a combination of J P C quantum numbers that cannot be created from a quark-antiquark pair alone. Such states are called exotic hybrid mesons, and their quantum numbers provide a useful experimental handle to isolate a

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“…For a review see Ref. [3]. Detailed studies are lacking above this mass region and it is now being studied to search for other glueball configurations.…”

Section: Landscapementioning

confidence: 99%

“…The isobar has relative orbital angular momentum L with respect to the bachelor pion. Each partial wave is thus specified in the reflectivity 01005-p. 3 basis using the notation of J P C M [isobar ]L, where = ±1 is the reflectivity. For a description of the partial wave analysis method (PWA) see Ref.…”

Section: Compass ( −1 Beam)mentioning

confidence: 99%

The light meson spectroscopy program

Smith

2014

EPJ Web of Conferences

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“…The research of glueballs may give a unique insight into the non-Abelian dynamics of QCD. Theoretical investigations including lattice simulations [1][2][3], model researches [4][5][6] and sum rule analyses [7][8][9][10][11][12][13][14][15][16][17][18] have been going on for a long time, but no decisive evidence of the existence of glueballs has been confirmed by experimental research up to now [19,20]. Further investigation on glueballs still makes sense.…”

Section: Introductionmentioning

confidence: 99%

Finite-width Laplacian sum rules for 2++ tensor glueball in the instanton vacuum model

Chen

Liu

2017

Phys. Rev. D

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The more-carefully defined, and more appropriate 2 ++ tensor glueball current is a SUc(3) gaugeinvariant, symmetric, traceless and conserved Lorentz-irreducible tensor. After Lorentz decomposition, the invariant amplitude of the correlation function is abstracted, and calculated based on the semiclassical expansion for quantum chromodynamics (QCD) in the instanton liquid background. Besides taking the perturbative contribution into account, we calculate the contribution arising from the interaction (or the interference) between instantons and the quantum gluon fields, which is infrared free. Instead of the usual zero-width approximation for the resonances, the Breit-Wigner form with a correct threshold behavior for the spectral function of the finite-width three resonances is adopted. The properties of the 2 ++ tensor glueball are investigated via a family of the QCD Laplacian sum rules for the invariant amplitude. The values of the mass, decay width and coupling constants for the 2 ++ resonance in which the glueball fraction is dominant are obtained.

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“…These states are a consequence of the non-Abelian nature of the gauge fields which allows that gluons couple to themselves and hence may bind. Despite the theoretical predictions of glueballs, no glueball state has been unambiguously established to date [4][5][6]. Lattice QCD calculations have predicted the lowest-lying scalar glueball state in the mass range of 1500-1700 MeV/c 2 , and tensor and pseudo-scalar glueballs in 2000-2500 MeV/c 2 [7].…”

Section: Introductionmentioning

confidence: 99%

“…Lattice QCD calculations have predicted the lowest-lying scalar glueball state in the mass range of 1500-1700 MeV/c 2 , and tensor and pseudo-scalar glueballs in 2000-2500 MeV/c 2 [7]. Experimentally measured glueball candidates for the scalar glueball states are the f 0 (1500) and the f 0 (1710) [8] in central production, pp → pM X p, as well as other gluon-rich reactions such aspp annihilation, and radiative J/ψ decay [5].…”

Section: Introductionmentioning

confidence: 99%

Central Exclusive Production in Proton-Proton Collisions with the STAR Experiment at RHIC

Guryn

2016

EPJ Web of Conferences

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Abstract. We shall describe the physics program with tagged forward protons, focusing on Central Exclusive Production in polarized proton-proton collisions at the Relativistic Heavy Ion Collider (RHIC), with the STAR detector at √ s = 200 GeV. Preliminary results in CEP of two oppositely charged pions and kaons produced in the processes pp → ppπ + π − and pp → ppK + K − shall be presented. Those Double Pomeron Exchange (DPE) processes, allow the final states to be dominated by gluonic exchanges. Silicon strip detectors placed in Roman Pots were used for measuring forward protons. The preliminary results are based on the measurement of the recoil system of charged particles in the STAR experiment's Time Projection Chamber (TPC). Ionization energy loss, dE/dx, of charged particles was used for particle identification (PID).

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The experimental status of glueballs

Cited by 222 publications

References 211 publications

The light meson spectroscopy program

The light meson spectroscopy program

Finite-width Laplacian sum rules for 2++ tensor glueball in the instanton vacuum model

Central Exclusive Production in Proton-Proton Collisions with the STAR Experiment at RHIC

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