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SCALAR MESONS PROBLEM

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The nonet (octet singlet) diagrams of the pseudoscalar, vector and ... [1] Griffiths, D., 'Introduction to Elementary Particles' , John Wiley & Sons, Inc. ... – PowerPoint PPT presentation

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Title: SCALAR MESONS PROBLEM


1
SCALAR MESONS PROBLEM
  • ASLI TANDOGAN

2
  • Mesons in Quark Model
  • Calculation of isospins of mesons
  • The nonet (octet singlet) diagrams of the
    pseudoscalar, vector and scalar mesons
  • Calculation of the Masses of the Scalar Mesons in
    Quark Model
  • Masses of the pseudoscalar mesons
  • Masses of the vector mesons
  • Masses of the scalar mesons
  • Scalar Mesons With Four Quarks

3
Quarks in natureu(up), d(down), s(strange),
c(charm), b(bottom), t(top)
  • For light mesons u, d s

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Calculation of isospin of mesons


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SCALAR MESONS IN QUARK MODEL
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LIGHT SCALAR MESONS NONET
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According to the naive quark model it is
difficult to understand
  • The mass degeneracy of f0(980)and a0(980)
  • The difference between the decay widths

15
CALCULATION OF THE MASSES OF THE MESONS
16
If we apply this formula to pseudoscalar mesons,
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AFTER ADDING THE MIXING TERMS THE MASS FORMULA
BECOMES
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SCALAR MESONS WITH FOUR QUARKS
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TheOZI rule postulates that hadronic decays
described by disconnected quark flow diagrams are
suppressed relative to those described by
connected diagrams
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WITH THIS FOUR QUARKS MODEL
  • The Mass Degeneracy
  • The different decay widths are easily understood.

29
REFERENCES
  • 1 Griffiths, D., Introduction to Elementary
    Particles , John Wiley Sons, Inc., 1987
  • 2 Klempt E., hep-ex/0101031
  • 3 http//pdg.lbl.gov/2005/reviews/quarkmodrpp.pd
    f 4 Britto T. V., Fernando S. N., Nielsen M.,
    Bracco M. E., hep-ph/0411233 5
    http//courses.washington.du/phys55x/Physics20557
    _App.html Maiani L., Piccinini F., Polosa A. D.,
    Piquer V., hep-ph/0407017
  • 6 Burcham W. E. Jobes M., Nuclear and
    Particle Physics, Prentice Hall,1995
  • 7 Quigg C., Models for Hadrons,
    FERMILAB-Conf-81/78-THY November 1981
  • 8 Gottfried, K. Weisskopf, V. F., Concepts
    of Particle Physics Volume1, Oxford University
    Press, New York 1984
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