Bottomonium dipion transitions

Simonov, Yu. A.; Veselov, A.I.

doi:10.1103/physrevd.79.034024

Cited by 38 publications

(71 citation statements)

References 49 publications

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“…were reported by Belle, which has stimulated theorists' interest in revealing the underlying mechanism behind these phenomena [4][5][6][7][8][9][10]. As a popular and accepted opinion, the hadronic loop mechanism has been applied to explain why there exist anomalous transitions for ϒ(5S) [4][5][6][7][8][9][10].…”

Section: Discussionmentioning

confidence: 99%

“…In addition, the two bottomonium-like states Z b (10610) and Z b (10650) were observed in ϒ(5S) → ϒ(nS)π + π − [3]. As indicated in a series of theoretical studies [4][5][6][7][8][9][10], the puzzling phenomena occurring in ϒ(5S) transitions reflect an underlying mechanism mediated by a coupled-channel effect, since ϒ(5S) is above the thresholds of B ( * ) (s)B ( * ) (s) [11]. In the bottomonium family, the ϒ(6S) is in a similar situation to that of ϒ(5S).…”

Section: Introductionmentioning

confidence: 98%

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Exploring the $$\Upsilon (6S)\rightarrow \chi _{bJ}\phi $$ Υ ( 6 S ) → χ

et al. 2017

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Exploring the $$\Upsilon (6S)\rightarrow \chi _{bJ}\phi $$ Υ ( 6 S ) → χ

et al. 2017

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“…Hence the physical quarkonium states have open-flavor meson-pair contributions and possible hybrid (QQg) or tetraquark contributions. The effect of such terms on hadronic transitions is not yet understood [531]. A possibly-related puzzle is the strikingly-large ratio…”

Section: Dileptonic Widths In the υ Familymentioning

confidence: 99%

Heavy quarkonium: progress, puzzles, and opportunities

Brambilla¹,

Eidelman²,

Heltsley³

et al. 2011

Advances in the Physics of Particles and Nuclei

103

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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.

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“…The pairs can consist of qq kicked out of the vacuum in space-like separated regions, as in the LUND string model [30] (then some enhancement mechanism is required to explain the strength of the anomalous soft photon signal, as noticed in [51]), or they can appear as closed quarkantiquark loops, as in the model [72][73][74][75][76], which is based on nonperturbative QCD methods applied to the large size systems and contains a strong enhancement mechanism, naturally appearing in this approach. The model was primarily developed for the description of the pion emission by closed qq loops of light quarks inside heavy quarkonia, but it can be applied also for an analogous description of the soft photon radiation deep inside jets, which would be a photon source, additional to the bremsstrahlung radiation from the final state hadrons.…”

Section: Modification Of the Incoherent Approachmentioning

confidence: 99%

Study of the dependence of direct soft photon production on the jet characteristics in hadronic Z 0 decays

Abdallah¹,

Abreu²,

Adam³

et al. 2010

Eur. Phys. J. C

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An analysis of the direct soft photon production rate as a function of the parent jet characteristics is presented, based on hadronic events collected by the DELPHI experiment at LEP1. The dependences of the photon rates on the jet kinematic characteristics (momentum, mass, etc.) and on the jet charged, neutral and total hadron multiplicities are reported. Up to a scale factor of about four, which characterizes the overall value of the soft photon excess, a similarity of the observed soft photon behavior to that of the inner hadronic bremsstrahlung predictions is found for the momentum, mass, and jet charged multiplicity dependences. However for the dependence of the soft photon rate on the jet neutral and total hadron multiplicities a prominent difference is found for the observed soft photon signal as compared to the expected bremsstrahlung from final state hadrons. The observed linear increase of the soft photon production rate with the jet total hadron multiplicity and its strong dependence on the jet neutral multiplicity suggest that the rate is proportional to the number of quark pairs produced in the fragmentation process, with the neutral pairs being more effectively radiating than the charged ones.

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Bottomonium dipion transitions

Cited by 38 publications

References 49 publications

Exploring the $$\Upsilon (6S)\rightarrow \chi _{bJ}\phi $$ Υ ( 6 S ) → χ

Exploring the $$\Upsilon (6S)\rightarrow \chi _{bJ}\phi $$ Υ ( 6 S ) → χ

Heavy quarkonium: progress, puzzles, and opportunities

Study of the dependence of direct soft photon production on the jet characteristics in hadronic Z 0 decays

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