Molecular States and 1^-+ Exotic Mesons

Abstract

This work investigates whether the observed 1^-+ exotic mesons are molecular states. We first use a potential model to calculate the spectra and lifetimes of the f_0(980) and a_0(980), taken to be loosely bound molecular states of K Kbar, then apply the same scenario to the 1^-+ exotic states pi_1(1400) and pi_1(1600), assuming them to be pi eta(1295) and pi eta(1440) molecules respectively. We derive the effective potential in the framework of field theory at the hadronic level. Our results indicate that the present data on pi_1(1400) and pi_1(1600) rule out the specific molecular ansatz. We show that the lifetime of a loosely bound heavy-light molecule with enough angular momentum is fully determined by the lifetimes of its constituent mesons.

23 pages, 1 figure, LaTeX

References in corpus (3)

• Observation of exotic meson production in the reaction ${\pi }^{-}p\to {\eta }^{\prime }{\pi }^{-}p$ at 18 GeV/c
• Final state interaction and a light mass "exotic" resonance
• The decay of the observed $J^{PC}=1^{-+}$ (1400) and $J^{PC}=1^{-+}$(1600) hybrid candidates

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• The bound state problem of S-wave heavy quark meson-aitimeson systems
• Light 1-+ exotics: molecular resonances
• Dimesonic states with the heavy-light flavour mesons
• Revisiting $1^{-+}$ and $0^{++}$ light hybrids from Monte-Carlo based QCD sum rules
• QCD quark cyclobutadiene and light tetraquark spectrum
• Mass spectra of dimesonic states in light flavour sector
• Exotic Hadron Bound State Production at Hadronic Colliders