Branching ratios for p̄p annihilation at rest into two-body final states
✍ Scribed by A. Abele; J. Adomeit; C. Amsler; C.A. Baker; B.M. Barnett; C.J. Batty; M. Benayoun; S. Bischoff; P. Blüm; K. Braune; D.V. Bugg; T. Case; K.M. Crowe; T. Degener; M. Doser; W. Dünnweber; D. Engelhardt; M.A. Faessler; P. Giarritta; R.P. Haddock; F.H. Heinsius; M. Heinzelmann; A. Herbstrith; M. Herz; N.P. Hessey; P. Hidas; C. Hodd; C. Holtzhaußen; D. Jamnik; H. Kalinowsky; P. Kammel; J. Kisiel; E. Klempt; H. Koch; M. Kunze; U. Kurilla; M. Lakata; R. Landua; H. Matthäy; R. McCrady; J. Meier; C.A. Meyer; L. Montanet; R. Ouared; K. Peters; B. Pick; M. Ratajczak; C. Regenfus; W. Roethel; S. Spanier; H. Stöck; C. Straßburger; U. Strohbusch; M. Suffert; J.S. Suh; U. Thoma; M. Tischhäuser; I. Uman; C. Völcker; S. Wallis-Plachner; D. Walther; U. Wiedner; K. Wittmack; B.S. Zou
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 308 KB
- Volume
- 679
- Category
- Article
- ISSN
- 0375-9474
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✦ Synopsis
Measurements of two-body branching ratios for pp annihilations at rest in liquid and gaseous (12ρ STP ) hydrogen are reported. Channels studied are pp → π 0 π 0 , π 0 η, K 0 S K 0 L , K + K -. The branching ratio for the π 0 π 0 channel in liquid H 2 is measured to be (6.14 ± 0.40) × 10 -4 . The results are compared with those from other experiments. The fraction of P-state annihilation for a range of target densities from 0.002ρ STP to liquid H 2 is determined. Values obtained include 0.11 ± 0.02 in liquid H 2 and 0.48 ± 0.04 in 12ρ STP H 2 gas.