Preparing for Success Search for a Heavy Non-qqbar Meson in Y(6S) Decays at Belle II

Sumitted to PubDB: 2020-09-15

Category: Master Thesis, Visibility: Public

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Authors	Shanette De La Motte, Samantha Taylor
Date	Jan. 1, 2017
Belle II Number	BELLE2-MTHESIS-2020-005
Abstract	While qqbar mesons and qqq baryons are ubiquitous in particle physics, the higher order qqqbarqbar mesons and qqqqq baryons are rarely seen, despite being completely allowed by quantum chromodynamics. In 2016, an analysis using data collected with the Belle detector at the KEKB asymmetric e+e- collider found evidence for a qqqbarqbar meson of 10610 MeV, referred to as Zb(10610)+, in Y(6S) decays. We perform an MC analysis of Y(6S) to [Zb(10610)+ to pi+ hb(1P)]pi- and relevant continuum events to assess how to best see this qqqbarqbar candidate in the upcoming sequel experiment, Belle II. We are able to measure the Zb+ using pion recoil mass distributions within error of the recorded invariant mass, for both Phase II and Phase III of Belle II detector geometries. We also improve upon the continuum suppression techniques implemented in the 2016 analysis, first by implementing a better selection criterion based on Fox-Wolfram moment, R2, and secondly by using TMVA toolkit to consider a set of continuum suppression selection criteria.
Conference	Melbourne, Australia