期刊
PHYSICAL REVIEW LETTERS
卷 103, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.103.052002
关键词
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资金
- Deutsche Forschungsgemeinschaft [SFB 443, SFB/TR 16]
- DFG-RFBR [05-02-04014]
- Schweizerischer Nationalfonds
- UK Science and Technology Facilities Council (STFC)
- European Community-Research Infrastructure Activity (FP6)
- US DOE
- US NSF
- NSERC (Canada)
- STFC [ST/G008582/1, ST/G008604/1, ST/F500572/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/G008582/1, ST/F500572/1, ST/G008604/1] Funding Source: researchfish
Beam-helicity asymmetries have been measured at the MAMI accelerator in Mainz in the three isospin channels (gamma) over right arrowp -> pi(+)pi(0)n, (gamma) over right arrowp -> pi(0)pi(0)p and (gamma) over right arrowp -> pi(+)pi(-)p. The circularly polarized photons, produced from bremsstrahlung of longitudinally polarized electrons, were tagged with the Glasgow magnetic spectrometer. Charged pions and the decay photons of pi(0) mesons were detected in a 4 pi electromagnetic calorimeter which combined the Crystal Ball detector with the TAPS detector. The precisely measured asymmetries are very sensitive to details of the production processes and are thus key observables in the modeling of the reaction dynamics.
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