Thesis BELLE2-PTHESIS-2019-003

Measurement of the CKM angle $\boldsymbol{\phi_3}$ from $\boldsymbol{B^{\pm}\to D(K_{\rm S}^0\pi^+\pi^-\pi^0)K^{\pm}}$ decays and future prospects

Resmi P K ; Jim Libby

2019
Indian Institute of Technology Madras Chennai, India

Abstract: We present the first model-independent measurement of the CKM unitarity triangle angle phi3 using B->D(KsPiPiPi0)K decays, where D indicates either a D0 or D0bar meson. Measurements of the strong-phase of the D->KsPiPiPi0 amplitude are obtained from a CLEO-c dataset of 0.8 fb^-1. These are used as external input to the phi3 measurement, which is performed on the full Belle data set of 772 x 10^6 BBbar pairs collected at the Upsilon(4S) resonance. We obtain phi3 = (5.7 ^{+10.2}_{-8.8} \pm 3.5 \pm 5.7) and the suppressed amplitude ratio rB = 0.323 \pm 0.147 \pm 0.023 \pm 0.051. Here the first uncertainty is statistical, the second is the experimental systematic uncertainty, and the third is the uncertainty due to the precision of the strong-phase parameters obtained from CLEO-c data. The 95% confidence interval on phi3 is (-29.7, 109.5), which is consistent with the current world average value. We also present the future prospect of this measurement at Belle II, a substantial upgrade of its predecessor. A brief discussion on the construction and quality assurance of the silicon vertex detector at Belle II and the first physics results from 2018 are also presented.​

Note: Presented on 26 11 2019
Note: PhD

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