Search for the Hypothetical pi -> mu x Decay

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dc.creatorBilger, R.
dc.creatorClement, H.
dc.creatorDenig, A.
dc.creatorFohl, K.
dc.creatorHautle, P.
dc.creatorKluge, W.
dc.creatorKonter, J. A.
dc.creatorKurz, G.
dc.creatorMango, S.
dc.creatorSchapler, D.
dc.creatorSchonleber, F.
dc.creatorSiodlaczek, U.
dc.creatorBrandt, B. van den
dc.creatorWagner, G. J.
dc.creatorWieser, R.
dc.date1995-08-18
dc.date.accessioned2026-07-07T10:35:21Z
dc.date.available2026-07-07T10:35:21Z
dc.descriptionThe KARMEN collaboration has reported the possible observation of a hitherto unknown neutral and weakly interacting particle x, which is produced in the decay pi -> mu + x with a mass m(x) = 33.9 MeV. We have searched for this hypothetical decay branch by studying muons from pion decay in flight with the LEPS spectrometer at the piE3 channel at PSI and find branching ratios BR(pi- to mu- anti-x) < 4e-7 and BR(pi+ to mu+ x) < 7e-8 (95\% C.L.). Together with the limit BR > 2e-8 derived in a recent theoretical paper our result would leave only a narrow region for the existence of x if it is a heavy neutrino.
dc.description10 pages, TeX (uses epsf), 3 Postscript figures uu-encoded
dc.identifierhttps://arxiv.org/abs/nucl-ex/9508001
dc.identifierhttp://arxiv.org/abs/nucl-ex/9508001
dc.identifierPhys.Lett.B363:41-45,1995
dc.identifierdoi:10.1016/0370-2693(95)01232-F
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/179726
dc.subjectNuclear Experiment
dc.subjectHigh Energy Physics - Experiment
dc.titleSearch for the Hypothetical pi -> mu x Decay
dc.typetext

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