Observation of the Decay K^+ --> pi^+ gamma gamma

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dc.creatorE787 Collaboration
dc.creatorKitching, P.
dc.creatorNakano, T.
dc.creatorRozon, M.
dc.creatorSoluk, R.
dc.creatorAdler, S.
dc.creatorAtiya, M. S.
dc.creatorChiang, I-H.
dc.creatorFrank, J. S.
dc.creatorHaggerty, J. S.
dc.creatorKycia, T. F.
dc.creatorLi, K. K.
dc.creatorLittenberg, L. S.
dc.creatorSambamurti, A.
dc.creatorStevens, A.
dc.creatorStrand, R. C.
dc.creatorWitzig, C.
dc.creatorLouis, W. C.
dc.creatorAkerib, D. S.
dc.creatorArdebili, M.
dc.creatorConvery, M.
dc.creatorIto, M. M.
dc.creatorMarlow, D. R.
dc.creatorMcPherson, R. A.
dc.creatorMeyers, P. D.
dc.creatorSelen, M. A.
dc.creatorShoemaker, F. C.
dc.creatorSmith, A. J. S.
dc.creatorBlackmore, E. W.
dc.creatorBryman, D. A.
dc.creatorFelawka, L.
dc.creatorKonaka, A.
dc.creatorKuno, Y.
dc.creatorMacdonald, J. A.
dc.creatorNumao, T.
dc.creatorPadley, P.
dc.creatorPoutissou, J. -M.
dc.creatorPoutissou, R.
dc.creatorRoy, J.
dc.creatorTurcot, A. S.
dc.date1997-08-08
dc.date1997-10-22
dc.date.accessioned2026-07-07T10:32:16Z
dc.date.available2026-07-07T10:32:16Z
dc.descriptionThe first observation of the decay K^+ --> pi^+ gamma gamma is reported. A total of 31 events was observed with an estimated background of 5.1 +- 3.3 events in the pi+ momentum range from 100 MeV/c to 180 MeV/c. The corresponding partial branching ratio, B(K+ -> pi+ gamma gamma, 100 MeV/c < P_pi^+ < 180 MeV/c), is (6.0 +- 1.5 (stat) +- 0.7 (sys)) x 10^{-7}. No K^+ --> pi^+ gamma gamma decay was observed in the pi^+ momentum region greater than 215 MeV/c. The observed pi^+ momentum spectrum is compared with the predictions of chiral perturbation theory.
dc.description9 pages, LaTeX, 3 Postscript figures
dc.identifierhttps://arxiv.org/abs/hep-ex/9708011
dc.identifierhttp://arxiv.org/abs/hep-ex/9708011
dc.identifierPhys.Rev.Lett.79:4079-4082,1997
dc.identifierdoi:10.1103/PhysRevLett.79.4079
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/178699
dc.subjectHigh Energy Physics - Experiment
dc.titleObservation of the Decay K^+ --> pi^+ gamma gamma
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