Observation of B → J/ψK1(1270)
Journal
Physical Review Letters
Journal Volume
87
Journal Issue
16
Date Issued
2001
Author(s)
Abe, K. et al.
Abe, K.
Adachi, I.
Ahn, B.S.
Aihara, H.
Asano, Y.
Aso, T.
Aulchenko, V.
Aushev, T.
Bakich, A.M.
Banas, E.
Abstract
We report the first observation of the exclusive decay process B-->J/psi K(1)(1270) using a sample of 11.2M BB macro meson pairs collected in the Belle detector at the KEKB asymmetric energy e(+)e(-) collider. We measure branching fractions of B[B(0)-->J/psi K(0)(1)(1270)] = (1.30+/-0.34+/-0.32) x 10(-3) and B[B(+)-->J/psi K(+)(1)(1270)] = (1.80+/-0.34+/-0.39) x 10(-3), where the first error is statistical and the second is systematic. These modes constitute approximately 15% of the total number of B-->J/psi X decays. No evidence is seen for B-->J/psi K(1)(1400) and we set an upper limit for this branching fraction.
Type
journal article