Observation of B->J/psi K1(1270)

TL;DR

This paper reports the first observation of the decay B->J/psi K1(1270) using data from the Belle detector, measuring its branching fractions and noting its significance in B decay processes.

Contribution

First observation of B->J/psi K1(1270) decay with measured branching fractions and analysis of decay components for CP violation studies.

Findings

Branching fraction B0 -> J/psi K1(1270) is (1.30 +-0.34 +-0.31)x10^-3.

Branching fraction B+ -> J/psi K1(1270) is (1.80 +-0.34 +-0.39)x10^-3.

No evidence for B -> J/psi K1(1400); upper limit set.

Abstract

We report the first observation of the exclusive decay process B->J/psi K1(1270) using a sample of 11.2M BBbar meson pairs collected in the Belle detector at the KEKB asymmetric e+e- collider. We measure branching fractions of Bf(B0 -> J/psi K10(1270) = (1.30 +-0.34 +-0.31)x10^-3 and Bf(B+ -> J/psi K1+(1270) = (1.80 +-0.34 +-0.39)x10-3, where the first error is statistical and the second systematic. These modes constitute approximately 15% of the total number of B -> J/psiX decays. No evidence is seen for B -> J/psi K1(1400) and we set an upper limit on this branching fraction. The K1(1270) -> K0pi+pi- decays have a substantial K0rho0 intermediate state component that may be useful for CP violation studies.