Heavy Quarkonium Spectroscopy

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Although the Standard Model of elementary particles is well established, strong interactions are not yet fully under control. We believe QCD is the field theory capable of describing them, but we are not yet capable, in most of the cases, to make exact predictions. Systems that include heavy quark-antiquark pairs (quarkonia) are ideal and unique laboratories to probe both the high energy regimes of QCD, where an expansion in terms of the coupling constant is possible, and the low energy regimes, where non-perturbative effects dominate. In the last years this field is experiencing a rapid expansion with a wealth of ... continued below

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7 pages

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Faccini, Riccardo & /Rome U. /INFN, Rome February 22, 2008.

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Although the Standard Model of elementary particles is well established, strong interactions are not yet fully under control. We believe QCD is the field theory capable of describing them, but we are not yet capable, in most of the cases, to make exact predictions. Systems that include heavy quark-antiquark pairs (quarkonia) are ideal and unique laboratories to probe both the high energy regimes of QCD, where an expansion in terms of the coupling constant is possible, and the low energy regimes, where non-perturbative effects dominate. In the last years this field is experiencing a rapid expansion with a wealth of new data coming in from diverse sources: data on quarkonium formation from dedicated experiments (BES at BEPC, KEDR at VEPP-4M CLEO-c at CESR), clear samples produced by high luminosity B-factories (PEP and KEKB), and very large samples produced from gluon-gluon fusion in p{bar p} annihilations at Tevatron (CDF and D0 experiments). In this review I will first summarize recent developments in the understanding of heavy quarkonium states which have a well established quark content. Next, the core of the paper will be spent to review the experimental evidences of new states that might be aggregations of more than just a quark-antiquark pair. Although the possibility to have bound states of two quarks and two antiquarks or of quark-antiquark pairs and gluons has been predicted since the very start of the quark model [2], no observed state has yet been attributed to one of them: achieving such an attribution would be a major step in the understanding of the strong interactions.

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7 pages

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  • Prepared for 23rd International Symposium on Lepton-Photon Interactions at High Energy (LP07), Daegu, Korea, 13-18 Aug 2007

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  • Report No.: SLAC-PUB-13080
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 924102
  • Archival Resource Key: ark:/67531/metadc897114

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • February 22, 2008

Added to The UNT Digital Library

  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 28, 2016, 7:45 p.m.

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Faccini, Riccardo & /Rome U. /INFN, Rome. Heavy Quarkonium Spectroscopy, article, February 22, 2008; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc897114/: accessed October 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.