Measurements of two-body branching ratios for pp annihilations at rest in liquid and gaseous (12ฯ STP ) hydrogen are reported. Channels studied are pp โ ฯ 0 ฯ 0 , ฯ 0 ฮท, K 0 S K 0 L , K + K -. The branching ratio for the ฯ 0 ฯ 0 channel in liquid H 2 is measured to be (6.14 ยฑ 0.40) ร 10 -4 . The res
Initial states and branching ratios in pp annihilations at rest
โ Scribed by U. Gastaldi; G. Maron; L. Vannucci; G. Vedovato
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 787 KB
- Volume
- 320
- Category
- Article
- ISSN
- 0370-2693
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X-ray yield data for pd atoms has been fitted with a cascade model to obtain information on the fraction of annihilation from atomic s-, p-and d-states as a function of D 2 target density. Assuming that the cascade model parameter K 0 is the same for both pp and pd atoms, typical values of 75% and 4
The annihilation frequencies of 19 pp annihilation reactions at rest obtained in different target densities are analysed in order to determine the values of the P -wave annihilation percentage at each target density and the average hadronic branching ratios from P -and S-states. Both the assumptions