We have observed the decays B --> phiK and phiK* in a sample of over 45 million B mesons collected with the BABAR detector at the PEP-II collider. The measured branching fractions are B(B(+)--> phiK(+)) = (7.7(-1.4)(+1.6)+/-0.8) x 10(-6), B(B(0)--> phiK(0)) = (8.1(-2.5)(+3.1)+/-0.8) x 10(-6), B(B(+)--> phiK*(+)) = (9.7(-3.4)(+4.2)+/-1.7) x 10(-6), and B(B(0)--> phiK*(0)) = (8.7(-2.1)(+2.5)+/-1.1) x 10(-6). We also report the upper limit B(B(+)--> phi pi (+)) < 1.4 x 10(-6) (90% C.L.).
Measurement of the decays B ->phi K and B ->phi K - asterisk
PREST, MICHELA;
2001-01-01
Abstract
We have observed the decays B --> phiK and phiK* in a sample of over 45 million B mesons collected with the BABAR detector at the PEP-II collider. The measured branching fractions are B(B(+)--> phiK(+)) = (7.7(-1.4)(+1.6)+/-0.8) x 10(-6), B(B(0)--> phiK(0)) = (8.1(-2.5)(+3.1)+/-0.8) x 10(-6), B(B(+)--> phiK*(+)) = (9.7(-3.4)(+4.2)+/-1.7) x 10(-6), and B(B(0)--> phiK*(0)) = (8.7(-2.1)(+2.5)+/-1.1) x 10(-6). We also report the upper limit B(B(+)--> phi pi (+)) < 1.4 x 10(-6) (90% C.L.).
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