Study of c1 and c2 Meson Production in B Meson Decays
Abstract
Using a sample of 9.7 million B meson pairs collected with the CLEO detector, we study B decays to the chic1 and chic2 charmonia states, which are reconstructed via their radiative decays to J/psi. We first measure the branching fraction for inclusive chic1 production in B decays to be Br(B->chic1 X)=(4.14+-0.31+-0.40)*10-3, where the first uncertainty is statistical and the second one is systematic. We derive the branching fractions for direct chic1 and chic2 production in B decays by subtracting the known contribution of the decay chain B->psi(2S)X with psi(2S)->chic1,2 gamma. We obtain Br[B->chic1(direct) X]=(3.83+-0.31+-0.40)*10-3. No statistically significant signal for chic2 production is observed in either case. Using the Feldman-Cousins approach, we determine the 95% confidence intervals to be [0.2, 2.0]*10-3 for Br(B->chic2 X), [0.0,1.7]*10-3 for Br[B->chic2(direct) X], and [0.00,0.44] for the ratio Br[B->chic2(direct) X]/Br[B->chic1(direct) X]. We also measure the branching ratio Br[B->chic2(direct) Xs]/Br[B->chic1(direct) Xs] for different Xs configurations by reconstructing B decays into exclusive final states with J/psi, a photon, a kaon, and up to four pions. For all the Xs configurations we observe a strong chic1 signal yet no statistically significant chic2 signal. We discuss how our results compare with theoretical predictions in different models of charmonium production.
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