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KANG-CHANG 1960

Kang-Chang, W.; Chu-Chien, W.; Veksler, V.I.; Viryasov, N.M.; Vrana, I.; Ta-Chao, T.; In, K.H.; Kladnitskaya, E.N.; Kuznetsov, A.A.; Mikhul, A.; Tu, N.D.; Nikitin, A.V.; Solovyev, M.I.;
anti-Σ^–-Hyperon Production by 8.3 BeV/ c π^–-Mesons
Zh. Eksp. Teor. Fiz. 38 (1960) 1356;

Summary
One event of production and decay of a anti-Σ^– hyperon was found out of 40,000 pictures obtained by a beam of negative 8.3 ± 0.6 BeV/c pions in a propane bubble chamber with a constant magnetic field of 13,700 oe. A photograph and diagram of this event are shown.
...The probability of a chance coincidence in one picture of various events which may have imitated the phenomenon under consideration is, according to our estimate, ~ 10^-9.
We consider the most probable reaction in the primary star to be π^– C → anti-Σ^– K^o anti-K^o K^– p π⁺ π^– + recoil nucleus For the lifetime of the anti-Σ^– we obtained the value (1.18 ± 0.07) ´ 10^-10 sec.\~ Hence, the data presented is evidence of the fact that we have observed a new type of particle, the charged antihyperon. (Extracted from the introductory part of the paper.).

Accelerator JINR Detectors HLBC-UNSPEC

Reactions

π– nucleus anti-Σ– X

8.3 GeV (Tlab)

p

Particles studied

anti-Σ–

ex, w

Record comments
First evidence for the anti-Σ^–.

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