| Autor: |
H. Dietl, G. Lütjens, V. Chabaud, Ralf P. Richter, G. Hentschel, E.J. Sacharidis, P. Weilhammer, E. Lorenz, W. Männer, W. Koch, G. Grayer, U. Stierlin, J. Meissburger, W. Blum, C. Jones, W. Hoogland, G. Lutz |
| Rok vydání: |
1981 |
| Předmět: |
|
| Zdroj: |
Nuclear Physics B. 179:9-32 |
| ISSN: |
0550-3213 |
| DOI: |
10.1016/0550-3213(81)90246-7 |
| Popis: |
We have measured 618 K+p → π+KS0p events at 12.7 GeV/c incident lab momentum, mass range 790 ⩽ mπ+Ks0 ⩽ 990 MeV and t range 0.01 ⩽ −t ⩽ 0.60 (GeV/c)2. The π+KS0 mass spectrum is dominated by the K∗+ (892) resonance and a Breit-Wigner fit yields a mass m = 893.5 ± 1.1 MeV and a width Γ = 33.2 ± 4.1 MeV which is much narrower than measured hitherto. The t distribution of K∗+ (892) events shows a dip in the forward direction and an exponential fall off thereafter, consistent with dominance of helicity flip amplitudes. The spin density matrix is almost saturated by ρ11 and ρ1−1 which are very close to their maximum allowed value of 1 2 throughout the measured t range except in the very forward direction where ρ00 and Re ρ10 deviate from zero. Natural parity exchanges, therefore, dominate with unnatural parity exchanges being restricted to a small region in the forward direction. A Regge pole analysis of the differential cross sections of the present measurement in conjunction with previously measured total cross sections supports the f-coupled-pomeron hypothesis. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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