| Autor: |
I. Derado, W.P. Swanson, D. Yount, R. F. Mozley, F. Villa, F.F. Liu, A.C. Odian, Jin-Hong Park, D.E.C. Fries, M. Davier |
| Rok vydání: |
1973 |
| Předmět: |
|
| Zdroj: |
Nuclear Physics B. 58:31-44 |
| ISSN: |
0550-3213 |
| DOI: |
10.1016/0550-3213(73)90545-2 |
| Popis: |
The reaction γp → π+π−π+π−p has been studied using the SLAC 2-meter streamer chamber placed in an 18 GeV bremsstrahlung beam. We find evidence for a broad enhancement (ϱ′) in the 4π mass spectrum at a mass of 1620 MeV with a width of about 300 MeV. This state is produced peripherally with a cross section consistent with being energy independent. I-spin = 1 (C = −1) is deduced from the dominant ϱππ decay mode and J ≠ 0 from the observation of a polarization phenomenon. Assuming quantum numbers JP = 1−, s-channel helicity is conserved at the γ−ϱ′ vertex. Further support for the JP assignment is gathered when comparing our results to data from e+e− colliding-beam experiments. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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