We report evidence for the Cabibbo-suppressed decay of the charm baryon Λc+ into the final state pK−K+. The analysis is performed on data collected by high energy photoproduction experiment E687 during the 1990–1991 Fermilab fixed target run. The branching ratio of the decay Lambac+ → pK−K+ relative to the non-suppressed Lambdac+ → pK−pi+ is measured to be BR(pK−K+/pK−pi+) = 0.096 ± 0.029 ± 0.010. The upper limit of the decay into pø relative to the inclusive pK−K+ decay is measured to be BR(rho0/pK−K+ < 58% at the 90% confidence level.
EVIDENCE OF THE CABIBBO-SUPPRESSED DECAY LAMBDA(C)(+)->PK-K+. / P.L. Frabetti, H.W.K. Cheung, J.P. Cumalat, C. Dallapiccola, J.F. Ginkel, S.V. Greene, W.E. Johns, M.S. Nehring, J.N. Butler, S. Cihangir, I. Gaines, P.H. Garbincius, L. Garren, S.A. Gourlay, D.J. Harding, P. Kasper, A. Kreymer, P. Lebrun, S. Shukla, M. Vittone, S. Bianco, F.L. Fabbri, S. Sarwar, A. Zallo, R. Culbertson, R.W. Gardner, R. Greene, J. Wiss, G. Alimonti, G. Bellini, B. Caccianiga, L. Cinquini, M. Di Corato, M. Giammarchi, P. Inzani, F. Leveraro, S. Malvezzi, D. Menasce, E. Meroni, L. Moroni, D. Pedrini, L. Perasso, A. Sala, S. Sala, D. Torretta, 4, D. Buchholz, D. Claes, 5, B. Gobbi, B. O'Reilly, J.M. Bishop, N.M. Cason, C.J. Kennedy, 6, G.N. Kim, T.F. Lin, D.L. Puseljic, R.C. Ruchti, W.D. Shephard, J.A. Swiatek, Z.Y. Wu, V. Arena, G. Boca, C. Castoldi, G. Gianini, S.P. Ratti, C. Riccardi, P. Vitulo, A. Lopez, G.P. Grim, V.S. Paolone, P.M. Yager, J.R. Wilson, P.D. Sheldon, F. Davenport, J.F. Filaseta, G.R. Blackett, M. Pisharody, T. Handler, B.G. Cheon, J.S. Kang, K.Y. Kim. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 314:3-4(1993 Sep 23), pp. 477-481.
EVIDENCE OF THE CABIBBO-SUPPRESSED DECAY LAMBDA(C)(+)->PK-K+.
G. Alimonti;G. Bellini;B. Caccianiga;M. Di Corato;M. Giammarchi;F. Leveraro;E. Meroni;G. Gianini;
1993
Abstract
We report evidence for the Cabibbo-suppressed decay of the charm baryon Λc+ into the final state pK−K+. The analysis is performed on data collected by high energy photoproduction experiment E687 during the 1990–1991 Fermilab fixed target run. The branching ratio of the decay Lambac+ → pK−K+ relative to the non-suppressed Lambdac+ → pK−pi+ is measured to be BR(pK−K+/pK−pi+) = 0.096 ± 0.029 ± 0.010. The upper limit of the decay into pø relative to the inclusive pK−K+ decay is measured to be BR(rho0/pK−K+ < 58% at the 90% confidence level.
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