Properties of heavy quarkonia and related states

Hagiwara, Kaoru; Katō, Kiyoshi; Martin, A. D.; Ng, C.

doi:10.1016/0550-3213(90)90683-5

Cited by 42 publications

(75 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Other decay channels are either flavorviolating or involve more than two particles in the final state and are therefore suppressed enough to allow formation of stoponia. Since top squarks are scalars, the lowest-energy bound state η t has spin zero and mass predicted in the range of 200-800 GeV [400][401][402]. The η t spin-zero state can be most effectively produced at the LHC in the gg → η t channel.…”

Section: Supersymmetric Quarkoniamentioning

confidence: 99%

Heavy quarkonium: progress, puzzles, and opportunities

Brambilla¹,

Eidelman²,

Heltsley³

et al. 2011

Advances in the Physics of Particles and Nuclei

103

View full text Add to dashboard Cite

A golden age for heavy quarkonium physics dawned a decade ago, initiated by the confluence of exciting advances in quantum chromodynamics (QCD) and an explosion of related experimental activity. The early years of this period were chronicled in the Quarkonium Working Group (QWG) CERN Yellow Report (YR) in 2004, which presented a comprehensive review of the status of the field at that time and provided specific recommendations for further progress. However, the broad spectrum of subsequent breakthroughs, surprises, and continuing puzzles could only be partially anticipated. Since the release of the YR, the BESII program concluded only to give birth to BESIII; the B-factories and CLEO-c flourished; quarkonium production and polarization measurements at HERA and the Tevatron matured; and heavy-ion collisions at RHIC have opened a window on the deconfinement regime. All these experiments leave legacies of quality, precision, and unsolved mysteries for quarkonium physics, and therefore beg for continuing investigations at BESIII, the LHC, RHIC, FAIR, the Super Flavor and/or Tau-Charm factories, JLab, the ILC, and beyond. The list of newly-found conventional states expanded to include hc(1P ), χc2(2P ), B + c , and η b (1S). In addition, the unexpected and still-fascinating X(3872) has been joined by * Editors † Section coordinators ‡ Corresponding author: bkh2@cornell.edu more than a dozen other charmonium-and bottomonium-like "XY Z" states that appear to lie outside the quark model. Many of these still need experimental confirmation. The plethora of new states unleashed a flood of theoretical investigations into new forms of matter such as quark-gluon hybrids, mesonic molecules, and tetraquarks. Measurements of the spectroscopy, decays, production, and in-medium behavior of cc, bb, and bc bound states have been shown to validate some theoretical approaches to QCD and highlight lack of quantitative success for others. Lattice QCD has grown from a tool with computational possibilities to an industrialstrength effort now dependent more on insight and innovation than pure computational power. New effective field theories for the description of quarkonium in different regimes have been developed and brought to a high degree of sophistication, thus enabling precise and solid theoretical predictions. Many expected decays and transitions have either been measured with precision or for the first time, but the confusing patterns of decays, both above and below open-flavor thresholds, endure and have deepened. The intriguing details of quarkonium suppression in heavy-ion collisions that have emerged from RHIC have elevated the importance of separating hotand cold-nuclear-matter effects in quark-gluon plasma studies. This review systematically addresses all these matters and concludes by prioritizing directions for ongoing and future efforts.

show abstract

Section: Supersymmetric Quarkoniamentioning

confidence: 99%

Heavy quarkonium: progress, puzzles, and opportunities

Brambilla¹,

Eidelman²,

Heltsley³

et al. 2011

Advances in the Physics of Particles and Nuclei

103

View full text Add to dashboard Cite

show abstract

“…In this paper, we used the parameterization of [31] for the wavefunction at the origin, but it must be recognized that this was obtained in part by a significant extrapolation from charmonium and bottomonium data. Even at the energy scales relevant for stoponium, the QCD binding potential is far from the semi-classical Coulomb form, and more work is needed to understand the relevant matrix elements.…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, it is quite possible that the potential models become less reliable for the higher excited states. In Figure 5 we plot the effective wavefunction at the origin factor given in [31] as a function of the 1S bound state mass. Three cases are shown in this plot: the contribution from the 1S bound state alone, the sum of the 1S and 2S bound states that we will use in numerical work, and the sum of the first 10 S-wave states.…”

Section: A Stoponium Wavefunction Effectsmentioning

confidence: 99%

“…In each case, the 40 MeV variation in the QCD scale Λ (4) QCD (obtained by interpolation from the values given in ref. [31]) is also plotted on the graph. Although the probability for producing higher-energy bound states drops sharply with higher n, Stop squark mass [GeV] their sum can add up to a significant enhancement to the overall production rate.…”

Section: A Stoponium Wavefunction Effectsmentioning

confidence: 99%

“…We will instead obtain the value of the wavefunction at the origin by using a parameterization [31] based on a potential extrapolated from the study of charmonium and bottomonium. The numerical results for |R nS (0)| 2 /M (ns) 3 in ref.…”

Section: A Stoponium Wavefunction Effectsmentioning

confidence: 99%

See 2 more Smart Citations

QCD corrections to stoponium production at hadron colliders

Younkin

Martin

2010

Phys. Rev. D

View full text Add to dashboard Cite

If the lighter top squark has no kinematically allowed two-body decays that conserve flavor, then it will live long enough to form hadronic bound states. The observation of the diphoton decays of stoponium could then provide a uniquely precise measurement of the top squark mass. In this paper, we calculate the cross section for the production of stoponium in a hadron collider at next-to-leading order (NLO) in QCD. We present numerical results for the cross section for production of stoponium at the LHC and study the dependence on beam energy, stoponium mass, and the renormalization and factorization scale. The cross-section is substantially increased by the NLO corrections, counteracting a corresponding decrease found earlier in the NLO diphoton branching ratio.

show abstract

Does the fundamental light scalar really exist?

Kozlov

1994

Nuov Cim A

View full text Add to dashboard Cite

Properties of heavy quarkonia and related states

Cited by 42 publications

References 25 publications

Heavy quarkonium: progress, puzzles, and opportunities

Heavy quarkonium: progress, puzzles, and opportunities

QCD corrections to stoponium production at hadron colliders

Does the fundamental light scalar really exist?

Contact Info

Product

Resources

About