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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.

Measurement of the anti-p p -> pi+pi- and anti-p p -> K+K- annihilation frequencies in a 5 mb hydrogen gas target / V. G., A., A., A., Agnello, M., A., A., F., B., G., B., G., B., A., B., P., B., G. C., B., T., B., M., B., M. P., B., L., B., D., C., M., C., P., C., C., C., M., C., S., C., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 329:2-3(1994), pp. 407-412. [10.1016/0370-2693(94)90794-3]

Measurement of the anti-p p -> pi+pi- and anti-p p -> K+K- annihilation frequencies in a 5 mb hydrogen gas target

AGNELLO, MICHELANGELO;IAZZI, Felice;MINETTI, Bruno;
1994

Abstract

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.
1994
PHYSICS LETTERS. SECTION B
1.1 Articolo in rivista
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/1845550
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