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Tetraquarks from the Bethe-Salpeter equation

We present a numerical solution of the four-quark Bethe-Salpeter equation for a scalar tetraquark. We find that the four-body equation dynamically generates pseudoscalar poles in the Bethe-Salpeter amplitude. The sensitivity to the pion poles leads to a light isoscalar tetraquark mass M ~ 400 MeV, which is comparable to that of the sigma/f0(500). The masses of its multiplet partners kappa and a0/f0 follow a similar pattern, thereby providing support for the tetraquark interpretation of the light scalar nonet.

preprint2015arXivOpen access
Gernot EichmannChristian S. FischerWalter Heupel
hep-phnucl-th
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Gernot EichmannChristian S. FischerWalter Heupel

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