M. Nielsen

activity

20052008

most cited

X (3872) \to J / ψ π^{+} π^{-}

and

X (3872) \to J / ψ π^{+} π^{-} π^{0}

decay widths from QCD sum rules

64 citations · 110 across the 4 of their papers we have counts for

collaborators

Showing hep-phShow all

6 papers · 1 filter

hep-ph2008

Review and interpretation of the new heavy states discovered at the $B$ -factories

Marina Nielsen

I discuss some recent discoveries in the spectroscopy of the charmonium-like resonances, and some of their theoretical interpretations are reviewed.

hep-ph2008★ 46 cited

The meson $Z^{+} (4430)$ as a tetraquark state

M. E. Bracco, S. H. Lee, M. Nielsen +1

We test the validity of the QCD sum rules applied to the meson $Z^{+} (4430)$ , by considering a diquark-antidiquark type of current with $J^{P} = 0^{-}$ and with $J^{P} = 1^{-}$ . We find…

hep-ph2006★ 64 cited

$X (3872) \to J / ψ π^{+} π^{-}$ and $X (3872) \to J / ψ π^{+} π^{-} π^{0}$ decay widths from QCD sum rules

F. S. Navarra, M. Nielsen

New spectroscopy from the B factories, the advent of CLEO-c and the BES upgrade renewed the interest in charmonia. Among the new measurements, the state X(3872) has received specia…

hep-ph2006

Reply to ``Reply to comment on A QCD sum rule study of the light scalar mesons"

M. E. Bracco, F. S. Navarra, M. Nielsen

This paper has been withdrawn by the authors. We have discovered an error in the evaluation of the diagram, which invalidates our conclusion.

hep-ph2005

Diquark-Antidiquark with open charm in QCD sum rules

M. Nielsen, R. D. Matheus, F. S. Navarra +2

Using the QCD sum rule approach we investigate the possible four-quark structure of the recently observed charmed scalar mesons $D_{0}^{0} (2308)$ (BELLE) and $D_{0}^{0, +} (2405)$ (FOCUS…

hep-ph2005

Pentaquark Decay Width in QCD Sum Rules

M. Eidemüller, F. S. Navarra, M. Nielsen +1

In a diquark-diquark-antiquark picture of the pentaquark we study the decay $Θ \to K^{+} n$ within the framework of QCD sum rules. After evaluation of the relevant three-poi…

Review and interpretation of the new heavy states discovered at the B-factories

The meson Z+(4430) as a tetraquark state