Search for B decays to final states with the η c mesonVinokurova, A. (Avtor) Bračko, Marko (Avtor) Golob, Boštjan (Avtor) Korpar, Samo (Avtor) Križan, Peter (Avtor) Pestotnik, Rok (Avtor) Petrič, Marko (Avtor) Ribežl, Eva (Avtor) Stanič, Samo (Avtor) Starič, Marko (Avtor) Šantelj, Luka (Avtor) Zupanc, Anže (Avtor) exoticsquarkoniume+-e- experimentsB physicsparticle and resonance productionWe report a search for B decays to selected final states with the ηc meson: B± → K±ηcπ+π−, B± → K±ηcω, B± → K±ηcη and B± → K±ηcπ0. The analysis is based on 772 × 10^6 B¯B pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. We set 90% confidence level upper limits on the branching fractions of the studied B decay modes, independent of intermediate resonances, in the range (0.6–5.3)×10^−4. We also search for molecular-state candidates in the D^0 ¯D^∗0 − ¯D^0D^∗0, D^0 ¯D^0 + ¯D^0D^0 and D^∗0¯D^∗0 + ¯D^∗0D^∗0 combinations, neutral partners of the Z(3900)± and Z(4020)±, and a poorly understood state X(3915) as possible intermediate states in the decay chain, and set 90% confidence level upper limits on the product of branching fractions to the mentioned intermediate states and decay branching fractions of these states in the range (0.6–6.9)×10^−5.20152017-06-27 13:00:49Znanstveno delo66467sl