Glueballs from gluon jets at the LHC

Ochs, Wolfgang; Minkowski, Peter

doi:10.48550/arxiv.1108.0589

Cited by 2 publications

(6 citation statements)

References 12 publications

(13 reference statements)

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“…as a background for Higgs searches in exclusive pp scattering. The exceptional dominance of digluon jets over quark-antiquark jets found here offers extraordinary conditions for increased glueball production in gluon fragmentation [27]. In order to investigate it more one needs to study a contamination of central diffractive components where the proportions of digluonic to quark-antiquark jets are less favourable.…”

Section: Resultsmentioning

confidence: 95%

New contributions to central exclusive production of dijets in proton-(anti)proton collisions

2011

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We consider central exclusive production of gg dijets in proton-proton (proton-antiproton) collisions at LHC and Tevatron for different intermediate and final gluon polarisations. The amplitude for the process is derived within the k ⊥ -factorization approach (with both the standard QCD and the Lipatov's effective three-gluon verticies) and is considered in various kinematical asymptotia, in particular, in the important limit of high-p ⊥ jets. Compared to earlier works we include emissions of gluons from different gluonic t-channel lines as well as emission of quark-antiquark dijets. Rapidity distributions, gluon jet p ⊥ distributions and invariant dijet mass distributions are presented. We explore the competition of the standard diagram with both jets emitted from a single t-channel gluon and the one with the emission from both t-channel gluons. The second mechanism requires a special treatment. We propose two different approaches. Including special kinematics and using properties of off-diagonal gluons at small x and ξ we arrive to correlations in two-dimensional distributions in rapidity of one and second jet. We find that the second contribution is much smaller than that known from the literature. The digluon production constitutes an important background to exclusive Higgs production. was shown in Ref.[9] that the first LHC measurements of the exclusive dijets would significantly reduce the theoretical uncertainty for the central exclusive Higgs boson production. This makes the process under consideration especially important from both theoretical and experimental points of view.Such a process has been recently investigated in detail in Ref. [6], and fairly good description of the Tevatron data has been achieved. We would like to extend such an analysis, both analytically and numerically, by analyzing separate contributions from different final gluon polarisations, various kinematical regions of the 4-particle phase space, which are important for future LHC measurements, and the theoretical uncertainties related with different choice of UGDFs and the factorisation scale. Similarly to Ref.[6], we shall limit ourselves to the lowest-order QCD calculation, and postpone the analysis of the higher order contributions for a separate study.Compared to the previous studies, we would like to perform an estimation of the process when one gluon is emitted from a one t-channel gluon of the QCD ladder and the second gluon is emitted from the other t-channel gluon. This contribution was discussed in Ref.[6] as potentially sizable. In this work, we present the first numerical calculation of this contribution.Recently, the calculation of the exclusive production of quark-antiquark dijets has been performed for heavy cc [10] and bb [7,8] pairs. Here, we extend our previous analysis and present the calculation including both contributions from light (u, d, s) and heavy (c, b) quark/antiquark jets compared to the one from the gluonic jets.A high precision measurement of exclusive bb pair production is required for central exc...

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Section: Resultsmentioning

confidence: 95%

New contributions to central exclusive production of dijets in proton-(anti)proton collisions

2011

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“…A promising possibility to identify gluonic mesons is provided by the comparative study of leading particle systems in quark and gluon jets (see [195] for a recent discussion). According to the well known concept of quark fragmentation the leading particles at large momentum fraction "Feynman x" are those which carry the primary quark of the jet as a valence quark, see figure 21.…”

Section: Leading Systems In Gluon Jetsmentioning

confidence: 99%

“…Models of this kind with leading glueballs in jets, and also with leading isoscalars like η, η ′ , ω at large x have been suggested already long ago [196], x-distributions have been considered in [197]. The model for isoscalar q q meson production has been studied at LEP with quark and gluon jets [198], but no clear experimental support for the model has been established [195]. This means that the isoscalars η and η ′ behave like other q q mesons in fragmentation.…”

Section: Leading Systems In Gluon Jetsmentioning

confidence: 99%

“…There are some advantages to follow this line of studies at pp colliders, especially at the LHC [195]:…”

Section: Proposal For Further Measurements At the Lhcmentioning

confidence: 99%

“…Table 13. Purities (in%) of quark and gluon jets at Tevatron [204] and at LHC [194], taken from [195]. p T and gluon jets in di-jet events also at the smaller p T .…”

Section: Proposal For Further Measurements At the Lhcmentioning

confidence: 99%

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The Status of Glueballs

Ochs

2013

Preprint

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Calculations within QCD (lattice and sum rules) find the lightest glueball to be a scalar and with mass in the range of about 1000-1700 MeV. Several phenomenological investigations are discussed which aim at the identification of the scalar meson nonets of lowest mass and the super-numerous states if any. Results on the flavour structure of the light scalars f 0 (500), f 0 (980) and f 0 (1500) are presented; the evidence for f 0 (1370) is scrutinized. A significant surplus of leading clusters of neutral charge in gluon jets is found at LEP in comparison with MCs, possibly a direct signal for glueball production; further studies with more energetic jets at LHC are suggested. As a powerful tool in the identification of the scalar nonets or other multiplets, along with signals from glueballs we propose the exploration of symmetry relations for decay rates of C = +1 heavy quark states like χ c or χ b . Results from χ c decays are discussed; they are not in support of a tetra-quark substructure of f 0 (980). A minimal scenario for scalar quarkonium-glueball spectroscopy is presented. * Bugg also obtained a consistent result R σKπ = 0.6 ± 0.1 from data on the radiative decay φ(1020) → γπ 0 π 0 with the contribution of the virtual process ππ → K K within the K K loop model.

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Glueballs from gluon jets at the LHC

Cited by 2 publications

References 12 publications

New contributions to central exclusive production of dijets in proton-(anti)proton collisions

New contributions to central exclusive production of dijets in proton-(anti)proton collisions

The Status of Glueballs

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