Final states with charged kaons in three-prong decays are studied by exploiting the particle identification from the dE/dx measurement. The results are based on a sample of about 16105 detected pairs collected with the ALEPH detector between 1991 and 1995 around the Z peak. The following branching ratios have been measured: B(−K−K+−)=(163021017)10−3 , B(−K−+−)=(214037029)10−3 , B(−K−K+−0)=(075029015)10−3 , and B(−K−+−0)=(061039018)10−3 . The first two measurements are more precise than the current world averages, while the last two channels are investigated for the first time. The 95% C.L. upper limit on the branching ratio for the decay −K−K+K− is 01910−3 . A study of intermediate states occurring in the K−K+− and K−+− decays is also presented.
Three-prong tau decays with charged kaons / R. Barate et al.; E.Focardi; V.Ciulli. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - ELETTRONICO. - 1:(1998), pp. 65-79. [10.1007/s100520050062]
Three-prong tau decays with charged kaons
FOCARDI, ETTORE;CIULLI, VITALIANO
1998
Abstract
Final states with charged kaons in three-prong decays are studied by exploiting the particle identification from the dE/dx measurement. The results are based on a sample of about 16105 detected pairs collected with the ALEPH detector between 1991 and 1995 around the Z peak. The following branching ratios have been measured: B(−K−K+−)=(163021017)10−3 , B(−K−+−)=(214037029)10−3 , B(−K−K+−0)=(075029015)10−3 , and B(−K−+−0)=(061039018)10−3 . The first two measurements are more precise than the current world averages, while the last two channels are investigated for the first time. The 95% C.L. upper limit on the branching ratio for the decay −K−K+K− is 01910−3 . A study of intermediate states occurring in the K−K+− and K−+− decays is also presented.
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