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HK: Fachverband Physik der Hadronen und Kerne

HK 49: Poster

HK 49.8: Poster

Thursday, March 15, 2007, 16:00–17:00, P

Upsilon(5S) decays at the BELLE Experiment — •Jens Sören Lange for the Belle collaboration — Justus-Liebig-Universität Gießen, II. Physikalisches Institut, Heinrich-Buff-Ring 16, 35392 Gießen

In 2006, the Belle experiment recorded about 20 fb⁻¹ of data on the the Υ(5S) resonance. While the Υ(4S) decays with a branching fraction of ≃50% into B^oB^o and ≃50% into B⁺B⁻, the decay of the Υ(5S) is more complicated, i.e. final states are B^oB^o, B^o*B^o, B^o*B^o* B^oB^oπ^o, B^o*B^oπ^o, B^o*B^o*π^o, B_s^oB_s^o, B_s^o*B_s^o, B_s^o*B_s^o*, B⁺B⁻, B^+*B⁻, B^+*B^−*, B^oB⁺π⁻, B^oB⁻π⁺, and B⁺B⁻π^o. All these states differ by charge conjugation (C=+1 or C=−1) and by orbital angular momenta (L=0,1,2). Therefore different time behaviour of B_d or B_s mixing occurs, and different branching fractions according to the final state CP can be observed. Progress on the entanglement of the final states and the implementation of the decays into the event generator EvtGen will be presented.