Towards the glueball spectrum from unquenched lattice QCD

Gregory, Eric B.; Irving, A.C.; Lucini, Biagio; McNeile, Craig; Rago, Antonio; Richards, Christopher M.; Rinaldi, Enrico

doi:10.1007/jhep10(2012)170

Cited by 181 publications

(187 citation statements)

References 35 publications

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“…Among the latter, pure Yang-Mills SU(N ) theories are comparatively well understood, and the spectra of glueballs of various quantum numbers are known. The ratio R has been computed to be 1.4 R YM 1.7 with the lower bound reached for small N and the upper bound by extrapolating to large N [27][28][29][30][31][32]. The question we want to address is whether there exist models in which R ≫ R YM .…”

Section: Jhep06(2016)114mentioning

confidence: 99%

Large mass hierarchies from strongly-coupled dynamics

Athenodorou

Bennett

Bergner

et al. 2016

J. High Energ. Phys.

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Besides the Higgs particle discovered in 2012, with mass 125 GeV, recent LHC data show tentative signals for new resonances in diboson as well as diphoton searches at high center-of-mass energies (2 TeV and 750 GeV, respectively). If these signals are confirmed (or other new resonances are discovered at the TeV scale), the large hierarchies between masses of new bosons require a dynamical explanation. Motivated by these tentative signals of new physics, we investigate the theoretical possibility that large hierarchies in the masses of glueballs could arise dynamically in new strongly-coupled gauge theories extending the standard model of particle physics. We study lattice data on non-Abelian gauge theories in the (near-)conformal regime as well as a simple toy model in the context of gauge/gravity dualities. We focus our attention on the ratio R between the mass of the lightest spin-2 and spin-0 resonances, that for technical reasons is a particularly convenient and clean observable to study. For models in which (non-perturbative) large anomalous dimensions arise dynamically, we show indications that this mass ratio can be large, with R > 5. Moreover, our results suggest that R might be related to universal properties of the IR fixed point. Our findings provide an interesting step towards understanding large mass ratios in the non-perturbative regime of quantum field theories with (near) IR conformal behaviour.

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Section: Jhep06(2016)114mentioning

confidence: 99%

Large mass hierarchies from strongly-coupled dynamics

Athenodorou

Bennett

Bergner

et al. 2016

J. High Energ. Phys.

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“…We observe that the exotic ground state is approximately 50% lighter than the expectation from lattice QCD; the dilaton mode mass is only approximately 15% smaller than the lattice result. Numerical simulations also indicate the mass of the first excited scalar state to be ≃ 2600 MeV with errors amounting to ≃ 300 MeV [2] (although mass corrections in the unquenched case may be substantial [3]); the excited dilaton state is within errors consistent with the lattice result while the excited exotic mode is approximately 15% too light. Hence already from the mass results the indication is that the exotic mode could be discarded while the dilaton mode appears compatible with simulations of the Yang-Mills sector of QCD.…”

Section: The Model and Its Implicationsmentioning

confidence: 56%

“…These states would have access to various quantum numbers J P C , where J denotes the total spin, P the parity and C the charge conjugation; the corresponding spectrum in the QCD Yang-Mills sector has been determined in numerical simulations [2,3] but the identification of glueballs in experimental data has proven to be a challenge, particularly in the J P C = 0 ++ (scalar) channel.…”

Section: Introductionmentioning

confidence: 99%

“…While all of them possess the quantum numbers of the ground state, there are strong reasons to focus on resonances above 1 GeV as candidates for the scalar glueball: (i) simulations in lattice QCD determine the ground-state mass at between approximately 1.65 GeV and 1.8 GeV [2,3]; (ii) various effective approaches to low-energy QCD arrive at an analogous result for the mass while describing the overall dynamics correctly [6]. Complication is that f 0 resonances will most certainly have contributions not only from the (pure) glueball states but also from those containing quarks (qq [7],qqqq [8] and others).…”

Section: Introductionmentioning

confidence: 99%

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Scalar Glueball in a Top--Down Holographic Approach to QCD

Parganlija¹

2015

Acta Phys. Pol. B Proc. Suppl.

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Identification of glueballs -bound states of gauge bosons in Quantum Chromodynamics (QCD) -is a very important open question in dynamics of the strong interaction. The search for the glueball ground state, carrying scalar quantum numbers, poses a particular challenge due to the existence of (i) several candidates for its realisation in the physical spectrum and (ii) inevitable mixing of the pure glueball state with those comprised of quarks. In this article, I discuss implications of an approach in holographic QCD where, among others, the mass and the two-pion decay of the pure scalar glueball can be studied.

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“…its mass, e.g. Lattice QCD [1][2][3][4], QCD Sum Rules [5][6][7][8][9][10][11], Supergravity Dual [12], Top-down Holographic Dual [13][14][15], Rotating Closed Strings [16], MIT Bag Model [17]. In these approaches, the scalar Glueball is expected generally to populate the low enery region from 1 GeV to 2.2 GeV, which is also a region rich in qq states.…”

Section: Introductionmentioning

confidence: 99%

Factorization for radiative heavy quarkonium decays into scalar Glueball

Zhu

2015

J. High Energ. Phys.

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We establish the factorization formula for scalar Glueball production through radiative decays of vector states of heavy quarkonia, e.g. J/ψ, ψ(2S) and Υ(nS), where the Glueball mass is much less than the parent heavy quarkonium mass. The factorization is demonstrated explicitly at one-loop level through the next-to-leading order (NLO) corrections to the hard kernel, the non-relativistic QCD (NRQCD) long-distance matrix elements (LDMEs) of the heavy quarkonium, and the light-cone distribution amplitude (LCDA) of scalar Glueball. The factorization provides a comprehensive theoretical approach to investigate Glueball production in the radiative decays of vector states of heavy quarkonia and determine the physic nature of Glueball. We discuss the scale evolution equation of LCDA for scalar Glueball. In the end, we extract the value of the decay constant of Scalar Glueball from Lattice QCD calculation and analyze the mixing effect among f 0 (1370), f 0 (1500) and f 0 (1710).

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Towards the glueball spectrum from unquenched lattice QCD

Cited by 181 publications

References 35 publications

Large mass hierarchies from strongly-coupled dynamics

Large mass hierarchies from strongly-coupled dynamics

Scalar Glueball in a Top--Down Holographic Approach to QCD

Factorization for radiative heavy quarkonium decays into scalar Glueball

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