Observation of a Structure in $pp \to ppγγ$ near the $ππ$ Threshold and its Possible Interpretation by $γγ$ Radiation from Chiral Loops in the Mesonic $σ$ Channel

Details Observation of a Structure in $pp \to ppγγ$ near the $ππ$ Threshold and its Possible Interpretation by $γγ$ Radiation from Chiral Loops in the Mesonic $σ$ Channel Observation of a Structure in $pp \to ppγγ$ near the $ππ$ Threshold and its Possible Interpretation by $γγ$ Radiation from Chiral Loops in the Mesonic $σ$ Channel

2004-06-29

arxiv.org/abs/hep-ex/0406081v1

Physics

High Energy Physics

High Energy Physics - Experiment

Scientific paper

The $pp \to pp\gamma\gamma$ reaction has been measured at CELSIUS using the WASA $4\pi$-detector with hydrogen pellet target. At $T_p = 1.20$ and 1.36 GeV, where most of the statistics has been accumulated, the $\gamma\gamma$ invariant mass spectrum exhibits a narrow structure around the $\pi\pi$ threshold, which possibly may be associated with two-photon radiation of $\pi^+\pi^-$ loops in the mesonic $\sigma$ channel.

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