000002369 001__ 2369
000002369 005__ 20210512161715.0
000002369 037__ $$aBELLE2-CONF-PROC-2021-016
000002369 041__ $$aeng
000002369 100__ $$aFilippo Dattola
000002369 245__ $$aSEARCH FOR B+ → K+νν DECAYS WITH AN INCLUSIVE TAGGING METHOD AT THE BELLE II EXPERIMENT
000002369 260__ $$a$$c2021-05-12
000002369 300__ $$a6
000002369 520__ $$aThis contribution illustrates a new search for the flavor-changing neutral-current decay B+ → K+νν performed by the Belle II experiment at the SuperKEKB asymmetric-energy electron-positron collider. In this study, a sample corresponding to an integrated luminosity of 63 fb−1 collected at the Υ(4S) resonance and an additional sample of 9 fb−1 collected at an energy 60 MeV below the resonance are used. A novel technique, based on an inclusive tagging method and exploiting the topological features of the B+ → K+νν decay, is employed and it provides a higher signal efficiency with respect to the methods used in the previous searches. No significant signal is observed. An upper limit of 4.1 × 10−5 is set on the B+ → K+νν branching fraction at the 90 % confidence level.
000002369 6531_ $$aMoriond EW 
000002369 6531_ $$aInclusive Tagging
000002369 6531_ $$aB+ → K+νν
000002369 8560_ $$ffilippo.dattola@desy.de
000002369 8564_ $$uhttps://docs.belle2.org/record/2369/files/BELLE2-CONF-PROC-2021-016.pdf