Measurement of the anti-p p -> pi+pi- and anti-p p -> K+K- annihilation frequencies in a 5 mb hydrogen gas target
- Ableev, V.G.
- Adamo, A.
- Agnello, Michelangelo
- Andrighetto, A.
- Balestra, F.
- Belli, G.
- Bendiscioli, G.
- Bertin, A.
- Boccaccio, P.
- Bonazzola, G.C.
- Bressani, T.
- Bruschi, M.
- Bussa, M.P.
- Busso, L.
- Calvo, D.
- Capponi, M.
- Cerello, P.
- Cicalo, C.
- Corradini, M.
- Costa, S.
- D'Antone, I.
- De Castro, S.
- D'Isep, F.
- Donzella, A.
- Fava, L.
- Feliciello, A.
- Ferrero, L.
- Filippi, A.
- Filippini, V.
- Galli, D.
- Garfagnini, R.
- Gastaldi, U.
- Gianotti, P.
- Grasso, A.
- Guaraldo, C.
- Iazzi, Felice
- Lai, A.
- Lanaro, A.
- Lodi Rizzini, E.
- Lombardi, M.
- Lucherini, V.
- Maggiora, A.
- Maneva, G.
- Marcello, S.
- Marconi, U.
- Margagliotti, G.
- Maron, G.
- Masoni, A.
- Massa, I.
- Minetti, Bruno
- Morando, M.
- Montagna, P.
- Musa, L.
- Nichitiu, F.
- Panzieri, D.
- Pauli, G.
- Piccinini, M.
- Piragino, G.
- Poli, M.
- Puddu, G.
- Ricci, R.A.
- Rossetto, E.
- Rotondi, A.
- Rozhdestvensky, A.M.
- Salvini, P.
- Santi, L.
- Sapozhnikov, M.G.
- Semprini Cesari, N.
- Serci, S.
- Spighi, R.
- Vecchi, S.
- Temnikov, P.
- Tessaro, S.
- Tosello, F.
- Tretyak, V.I.
- Usai, G.
- Vannucci, L.
- Vedovato, G.
- Venturelli, L.
- Villa, M.
- Vitale, A.
- Zenoni, A.
- Zoccoli, A.
- Zosi, G.
DOIAbstract
We report the first measurement of the K+K−, π+π− frequencies for annihilations at rest in a gaseous H2 target at low pressure (5 mbar). We have obtained: fππ = (4.26±0.11)×10−3, fKK = (0.46±0.03)×10−3. The ratio R = fKK/fππ 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-ray in coincidence
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