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Search for weakly interacting neutral bosons produced in. pi. sup minus p interactions at rest and decaying into e sup + e minus pairs
Ist Teil von
Physical review letters, 1992-06, Vol.68:26
Ort / Verlag
United States
Erscheinungsjahr
1992
Quelle
PROLA (Physical Review Online Archive)
Beschreibungen/Notizen
We present the result of a search for weakly interacting neutral bosons ({ital X}) produced in {pi}{sup {minus}}{ital p} interactions at rest and decaying into {ital e}{sup +}{ital e{minus}} pairs. The data sample searched contains 98 400 {pi}{sup 0}{r arrow}{ital e}{sup +}{ital e{minus}}{gamma} decays and 27 200 {pi}{sup {minus}}{ital p}{r arrow}{ital ne}{sup +}{ital e{minus}} events, each with an {ital e}{sup +}{ital e{minus}} invariant mass between 25 and 139 MeV/{ital c}{sup 2}. They were observed in the SINDRUM I magnetic spectrometer at the Paul Scherrer Institute (Switzerland). We measure upper limits for the branching ratios {Gamma}({pi}{sup 0}{r arrow}{ital X}{gamma}, {ital X}{r arrow}{ital e}{sup +}{ital e{minus}})/{Gamma}({pi}{sup 0}{r arrow}all) and {Gamma}({pi}{sup {minus}}{ital p}{r arrow}{ital Xn}, {ital X}{r arrow}{ital e}{sup +}{ital e{minus}})/{Gamma}({pi}{sup {minus}}{ital p}{r arrow}all) for {ital X} lifetimes between 10{sup {minus}23} and 10{sup {minus}11} s.