000001665 001__ 1665
000001665 005__ 20200727123100.0
000001665 037__ $$aBELLE2-NOTE-PL-2019-025
000001665 041__ $$aeng
000001665 100__ $$aBenedikt Wach
000001665 245__ $$aFirst charmless B signal reconstruction in Belle II
000001665 260__ $$a$$c2019-09-07
000001665 300__ $$amult. p
000001665 520__ $$aWe report on the first reconstruction of a B charmless signal in Belle II. We use MC12 simulation to devise an optimized selection to be applied to the full (Phase 3) data set collected in 2019, corresponding to 5.61 fb −1 of integrated luminosity. The m bc distribution of the resulting sample, restricted in ∆E, is fit to search for a B → Kπ charmless signal. A total signal yield of approximately 28 decays is reconstructed, corresponding to a statistical significance of XX standard deviations. The signal yield is moderately (31%) inferior to those expected from simulation, with comparable backgrounds. This constitutes the first reconstruction of a charmless signal in Belle II and is proposed for public showing at the Beauty 2019 conference.
000001665 8560_ $$fbenedikt.wach@desy.de
000001665 8564_ $$uhttps://docs.belle2.org/record/1665/files/Approved%20Plots.pdf