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Hybrids and Glueballs

--. -+. 1. 1. 2. 10. c. c. q. q. c. i. t. t. o. h. x. g. i. E. l. c. i. 1. t. o. x. E. -2. 10. 0. 2000. 4000. MeV/. c. 2. Hybrids and Glueballs. The QCD spectrum is much richer than that of the quark model as the gluons can also act as hadron components.

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Hybrids and Glueballs

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  1. -- -+ 1 1 2 10 c c q q c i t t o h x g i E l c i 1 t o x E -2 10 0 2000 4000 MeV/ c 2 Hybrids and Glueballs The QCD spectrum is much richer than that of the quark model as the gluons can also act as hadron components. Glueballs states of pure glue Hybrids qqg • In the light meson spectrum exotic • states overlap with conventional states. • In the cc meson spectrum the density • of states is lower and the exotics can • be resolved unambiguously

  2. P S Charmonium Hybrids • Fluxtube-Modell predicts DD** decays • if mH<4,29 GeV • ®GH<50 MeV • Some exotics can decay neither to DD nor to DD* • e.g.: JPC(H)=0+- • fluxtube allowedJ/yf2, J/y(pp)S,h1ch • fluxtube forbiddencc0w,cc0f,cc2w,cc2f,hch1 • Small number of final states with small phasespace CLEO

  3. Charmonium Hybrids • Gluon rich process creates gluonic excitation in a direct way • ccbar requires the quarks to annihilate (no rearrangement) • yield comparable tocharmonium production • 2 complementary techniques • Production(Fixed-Momentum) • Formation(Broad- and Fine-Scans) • Momentum range for a survey • p ® ~15 GeV

  4. Heavy Glueballs Light gg/ggg systems are complicated to identify. Exotic heavy glueballs: • m(0+-) = 4140(50)(200) MeV • m(2+-) = 4740(70)(230) MeV Width unknown Flavour blindness predicts decays into charmed final states. Same run period as hybrids. Morningstar und Peardon, PRD60 (1999) 034509 Morningstar und Peardon, PRD56 (1997) 4043

  5. p- 25 MeV p p+ K+ K 100 MeV K- D D- 50 MeV D+ Hayaski, PLB 487 (2000) 96 Morath, Lee, Weise, priv. Comm. Hadrons in Nuclear Matter • Partial restoration of chiral symmetry in nuclear matter • Light quarks are sensitive to quark condensate • Evidence for mass changes of pions and kaons has been deduced previously: • deeply bound pionic atoms • (anti)kaon yield and phase space distribution • Ds are the QCD analog of the H-atom. • chiral symmetry to be studied on a single light quark vacuum nuclear medium

  6. Charmonium in the Nuclei • Lowering of the D+D- mass • allow charmonium states to decay into this channel, • thus resulting in a dramatic increase of width • Idea • Study relative changes ofyield and width of the charmonium states.

  7. e- e+ s(e+e-) pb 200 J/y 100 FF 0 3.5 4.5 4.0 5.0 p(pbar) GeV/c J/y Absorption in Nuclei • Important for the understanding of heavy ion collisions • Related to QGP • Reaction • p + A  J/Y + (A-1) • A complete set of measurements could be done • J/y, y‘, J on different nuclear targets • Longitudinal and transverse Fermi-distribution is measurable J/y

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