Search for nucleon decay into lepton+K0 final states using Soudan 2

D. Wall, W. W.M. Allison, G. J. Alner, D. S. Ayres, W. L. Barrett, C. Bode, P. M. Border, C. B. Brooks, J. H. Cobb, R. Cotton, H. Courant, D. M. Demuth, T. H. Fields, H. R. Gallagher, C. Garcia-Garcia, M. C. Goodman, R. Gran, T. Joffe-Minor, T. Kafka, S. M.S. KasaharaW. Leeson, P. J. Litchfield, N. P. Longley, W. A. Mann, M. L. Marshak, R. H. Milburn, W. H. Miller, L. Mualem, A. Napier, W. P. Oliver, G. F. Pearce, E. A. Peterson, D. A. Petyt, L. E. Price, K. Ruddick, M. Sanchez, J. Schneps, M. H. Schub, R. Seidlein, A. Stassinakis, H. Tom, J. L. Thron, G. Villaume, S. P. Wakely, N. West

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6 Scopus citations

Abstract

A search for nucleon decay into two-body final states containing K0 mesons has been conducted using the 963 metric ton Soudan 2 iron tracking calorimeter. The topologies, ionizations, and kinematics of contained events recorded in a 5.52 kiloton-year total exposure (4.41 kton-year fiducial volume exposure) are examined for compatibility with nucleon decays in an iron medium. For proton decay into the fully visible final states μ+KS0 and e+KS0, zero and one event candidates are observed respectively. The lifetime lower limits (τ/B) thus implied are 1.5×1032 yr and 1.2×1032 yr, respectively. Lifetime lower limits are also reported for proton decay into l+K10, and for neutron decay into vKS0.

Original languageEnglish (US)
Article number072004
Pages (from-to)1-16
Number of pages16
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume61
Issue number7
StatePublished - Apr 1 2000

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