This letter presents a search for the rare flavor-changing neutral current process B0→K∗0τ+τ− using data taken with the Belle detector at the KEKB asymmetric energy e+e− collider. The analysis is based on the entire Υ(4S) resonance data sample of 711 fb−1, corresponding to 772×10^6 BB¯ pairs. In our search we fully reconstruct the companion B meson produced in the process e+e−→Υ(4S)→BB¯ from its hadronic decay modes, and look for the decay B0→K∗0τ+τ− in the rest of the event. No evidence for a signal is found. We report an upper limit on the branching fraction B(B0→K∗0τ+τ−)<3.1×10^−3 at 90% confidence level. This is the first direct limit on B(B0→K∗0τ+τ−).
Search for the decay B0→K*0τ+τ- at the Belle experiment
F. Tenchini;
2023-01-01
Abstract
This letter presents a search for the rare flavor-changing neutral current process B0→K∗0τ+τ− using data taken with the Belle detector at the KEKB asymmetric energy e+e− collider. The analysis is based on the entire Υ(4S) resonance data sample of 711 fb−1, corresponding to 772×10^6 BB¯ pairs. In our search we fully reconstruct the companion B meson produced in the process e+e−→Υ(4S)→BB¯ from its hadronic decay modes, and look for the decay B0→K∗0τ+τ− in the rest of the event. No evidence for a signal is found. We report an upper limit on the branching fraction B(B0→K∗0τ+τ−)<3.1×10^−3 at 90% confidence level. This is the first direct limit on B(B0→K∗0τ+τ−).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
