000001273 001__ 1273
000001273 005__ 20190128155118.0
000001273 037__ $$aBELLE2-MTHESIS-2019-001
000001273 041__ $$aeng
000001273 100__ $$aBenjamin Haser
000001273 245__ $$aSensitivity Studies for the Branching Fraction of the B to K(*) nu nu Decays with an Inclusive Tag B Reconstruction for the Belle II Experiment
000001273 260__ $$amunich$$bLudwig-Maximilians-Universität$$c2018
000001273 300__ $$a125
000001273 500__ $$aPresented on 28 11 2018
000001273 502__ $$aMSc$$bmunich, Ludwig-Maximilians-Universität$$c2018
000001273 520__ $$aIn this thesis a sensitivity study for the B to K(*) nu nu transitions will be provided by using the Belle II analysis software framework and Monte Carlo samples. Since previous studies already set an upper limit close to the theoretical predictions, but the signal significance was not sufficient to measure the branching fraction, an inclusive reconstruction of the tag B meson will be performed. This method enables a measurement of higher signal events. Howerver, it suffers from a tremendous amount of background. Since the Belle II experiment is still in calibration phase, this thesis investigates only Monte Carlo samples. In comparison to previous analysis an improvement for the expected sensitivity for the branching fraction for the neutral B transition was archived. Unfortunately, it performed worse for the charged transitions compared to exclusive studies. In conclusion, it should be possible for both analysis methods to measure all B to K(*) nu nu transitions with sufficient significance with the full Belle II data sample of 50 inverse attobarn. 
000001273 700__ $$aProf. Dr. Thomas Kuhr$$edir.
000001273 8560_ $$fbenjamin.haser@desy.de
000001273 980__ $$aTHESIS