Measurement of anti-p p pi+pi- and anti-p p->K+K- annihilation frequencies in a 5mb hydrogen gas target
Academic Article
Publication Date:
1994
abstract:
We report the first measurement of the K +K-, 7r + 7r- frequencies for ~ annihilations at rest in a gaseous H 2 target at low
pressure (5 mbar). We have obtained: f~= (4.26+0.11 ) × 10 -3, fKK = (0.46+0.03) × 10 -3. The ratio R=fKK/f~, has also
been measured at a pressure of 2 mbar. Comparison with previous measurements shows that fKK decreases monotonically with
the target density but its value at 5 mbar is still higher than the value with L X-rays in coincidence.
Antiproton-proton annihilations at rest occur from
the 1So spin singlet and 3S1 spin triplet S-wave initial
states with principal quantum number n >~ 1 and from
the lp~ spin singlet and 3P o, 3P 1 and 3P 2 spin triplet P
Iris type:
1.1 Articolo in rivista
List of contributors:
V. G., Ableev i; A., Adamo a; M., Agnello b; A., Andrighetto e; F., Balestra e; G., Belli c; G., Bendiscioli; A., Bertin e; P., Boccaccio f; G. C., Bonazzola g; T., Bressani g; M., Bruschi e; M. P. P., nssa e; L., Busso g; D., Calvo e; M., Capponi e; P., Cerello g; C., Cicalo a; M., Corradini c; S., Costa g; I., D'Antone e; S., De Castro e; F., D'Isep g; A., Donzella ~; L., Fava e; A., Feliciello e; L., Ferrero g; A., Filippi h; V., Filippini a; D., Galli e; R., Garfagnini e; U. Gastaldi e. p., Gianotti J; A., Grasso g; C., Guaraldo J; F., Iazzi b; A., Lai a; A., Lanaro J; E., Lodi Rizzini ~; M., Lombardi f; V., Lucherini J; A., Maggiora g; G., Maneva i; S., Marcello e; U. Marconi e. G., Margagliotti k; G., Maron f; A., Masoni a; I., Massa e; B., Minetti u; M., Morando e; Montagna, PAOLO MARIA; L., Musa a; F., Nichitiu J; D., Panzieri g; G., Pauli k; M., Piccinini e; G., Piragino e; M., Poli m; G., Puddu a; R. A. Ricci e. e. E., Rossetto; Rotondi, Alberto; A. M. Rozhdestvensky i. P., Salvini; L., Santi n; M. G., Sapozhnikov i; N., Semprini Cesari e; S., Serci a; R., Spighi e; S., Vecchi e; P., Temnikov a; S., Tessaro k; F., Tosello g; V. I., Tretyak a; G., Usai a; L., Vannucci f; G., Vedovato f; L., Venturelli ~; M., Villa e; A., Vitale e; A., Zenoni ~; A, ; A., Zoccoli e; G., Zosi
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