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High Energy Physics - Phenomenology

arXiv:hep-ph/0506046 (hep-ph)
[Submitted on 6 Jun 2005 (v1), last revised 25 Jul 2005 (this version, v2)]

Title:Shape of the $f_0(980)$ in $γγ\toπ^+π^-$

Authors:N.N. Achasov, G.N. Shestakov
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Abstract: The Belle Collaboration results on the observation of the $f_0(980)$ resonance in the reaction $\gamma\gamma\to\pi^+\pi^-$ are analyzed. It is argued that they point to the presence of mechanisms which give rise to a strong distortion of the $f_0(980)$ resonance shape in comparison with the shape of a solitary Breit-Wigner resonance. It is shown that the main factors responsible for the formation of the specific, steplike, shape of the $f_0(980)$ resonance in the $\gamma\gamma\to\pi^+\pi^-$ reaction cross section are the $K^+K^-$ loop mechanism of the $f_0(980)$ coupling to the $\gamma\gamma$ system and the destructive interference between the background and $f_0(980)$ resonance contributions in the $\pi^+\pi^-$ invariant mass region below the $K^+K^-$ threshold.
Comments: 10 pages, 6 figures, published version
Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
Cite as: arXiv:hep-ph/0506046
  (or arXiv:hep-ph/0506046v2 for this version)
  https://doi.org/10.48550/arXiv.hep-ph/0506046
Journal reference: Phys.Rev.D72:013006,2005
Related DOI: https://doi.org/10.1103/PhysRevD.72.013006

Submission history

From: Nikolay Achasov [view email]
[v1] Mon, 6 Jun 2005 09:53:08 UTC (421 KB)
[v2] Mon, 25 Jul 2005 09:21:49 UTC (421 KB)
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