Precise determination of the η[sub c] mass and width in the radiative J∕ψ→η[sub c]γ decay

Brambilla, Nora; Roig, Pablo; Vairo, Antonio

doi:10.1063/1.3575048

Cited by 8 publications

(3 citation statements)

References 10 publications

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“…Both theoretical determinations are consistent with each other and fall in between the PDG average and the latest KEDR determination with the lattice determination favoring a somewhat larger value and the perturbative QCD determination a somewhat smaller value of the transition width. Part of the tension between data, and between data and theoretical determinations may be due to the fact that the extraction of the branching fraction from the photon energy line shape in is not free from uncontrolled uncertainties [ 1008 ].…”

Section: Heavy Quarksmentioning

confidence: 99%

QCD and strongly coupled gauge theories: challenges and perspectives

et al. 2014

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We highlight the progress, current status, and open challenges of QCD-driven physics, in theory and in experiment. We discuss how the strong interaction is intimately connected to a broad sweep of physical problems, in settings ranging from astrophysics and cosmology to strongly coupled, complex systems in particle and condensed-matter physics, as well as to searches for physics beyond the Standard Model. We also discuss how success in describing the strong interaction impacts other fields, and, in turn, how such subjects can impact studies of the strong interaction. In the course of the work we offer a perspective on the many research streams which flow into and out of QCD, as well as a vision for future developments.

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Section: Heavy Quarksmentioning

confidence: 99%

QCD and strongly coupled gauge theories: challenges and perspectives

et al. 2014

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“…Finally, the photon line shape in the radiative transition J/ψ → γ η c (1S ) has been studied in Ref. [718].…”

Section: • Weakly-coupled Pnrqcdmentioning

confidence: 99%

The $XYZ$ states: experimental and theoretical status and perspectives

Brambilla,

Eidelman,

Hanhart

et al. 2019

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139

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The quark model was formulated in 1964 to classify mesons as bound states made of a quark-antiquark pair, and baryons as bound states made of three quarks. For a long time all known mesons and baryons could be classified within this scheme. Quantum Chromodynamics (QCD), however, in principle also allows the existence of more complex structures, generically called exotic hadrons or simply exotics. These include four-quark hadrons (tetraquarks and hadronic molecules), five-quark hadrons (pentaquarks) and states with active gluonic degrees of freedom (hybrids), and even states of pure glue (glueballs). Exotic hadrons have been systematically searched for in numerous experiments for many years. Remarkably, in the past fifteen years, many new hadrons that do not exhibit the expected properties of ordinary (not exotic) hadrons have been discovered in the quarkonium spectrum. These hadrons are collectively known as XYZ states. Some of them, like the charged states, are undoubtedly exotic. Parallel to the experimental progress, the last decades have also witnessed an enormous theoretical effort to reach a theoretical understanding of the XYZ states. Theoretical approaches include not only phenomenological extensions of the quark model to exotics, but also modern non-relativistic effective field theories and lattice QCD calculations. The present work aims at reviewing the rapid progress in the field of exotic XYZ hadrons over the past few years both in experiments and theory. It concludes with a summary on future prospects and challenges.

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“…The quarkonium magnetic moment is explicitly calculated and turns out to be very small in agreement with a recent lattice calculation [39]; the M1 transition of the lowest quarkonium states at relative order v 2 turn out to be completely accessible in perturbation theory [62]. A description of the η c line shape has been given in [57]. and effective field theory calculation of electric dipole transitions is currently in elaboration [48].…”

Section: Quarkonium Spectra Decays Exotics and Productionmentioning

confidence: 58%