Title: SCALAR MESONS PROBLEM
1SCALAR MESONS PROBLEM
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
3Quarks in natureu(up), d(down), s(strange),
c(charm), b(bottom), t(top)
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5Calculation of isospin of mesons
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11SCALAR MESONS IN QUARK MODEL
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13LIGHT SCALAR MESONS NONET
14According 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
15CALCULATION OF THE MASSES OF THE MESONS
16If we apply this formula to pseudoscalar mesons,
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21AFTER ADDING THE MIXING TERMS THE MASS FORMULA
BECOMES
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23SCALAR MESONS WITH FOUR QUARKS
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26TheOZI rule postulates that hadronic decays
described by disconnected quark flow diagrams are
suppressed relative to those described by
connected diagrams
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28WITH THIS FOUR QUARKS MODEL
- The Mass Degeneracy
- The different decay widths are easily understood.
29REFERENCES
- 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