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
| dc.creator | Bashkanov, M. | |
| dc.creator | collaboration, CELSIUS-WASA | |
| dc.date | 2004-06-29 | |
| dc.date.accessioned | 2026-07-07T03:36:22Z | |
| dc.date.available | 2026-07-07T03:36:22Z | |
| dc.description | The $pp \to ppγγ$ reaction has been measured at CELSIUS using the WASA $4π$-detector with hydrogen pellet target. At $T_p = 1.20$ and 1.36 GeV, where most of the statistics has been accumulated, the $γγ$ invariant mass spectrum exhibits a narrow structure around the $ππ$ threshold, which possibly may be associated with two-photon radiation of $π^+π^-$ loops in the mesonic $σ$ channel. | |
| dc.identifier | https://arxiv.org/abs/hep-ex/0406081 | |
| dc.identifier | http://arxiv.org/abs/hep-ex/0406081 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/37727 | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | 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 | |
| dc.type | text |