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学术报告

Inclusive|Vub|Measurement at Belle (II)

by Lu Cao (IHEP)

Asia/Shanghai
Description
The discrepancy between inclusive and exclusive measurements of the CKM matrix element |Vub| has posed a longstanding puzzle. Since one of the major difficulties involved with the inclusive |Vub| measurement is the determination of the non-perturbative distribution function describing the internal Fermi motion of the b-quark, innovative new analysis strategies aimed toward reducing model uncertainties have been suggested. One of these approaches proposes to measure key kinematic differential distributions of B → Xu l ν decays and combine them into a global, data-driven fit, which would simultaneously determine |Vub| as well as other useful parameters. This analysis makes use of hadronic tagging and is performed on the full dataset of the Belle experiment comprising 772 million B meson pairs. This talk will present the current status of the on-going analysis. About the speaker: Dr. Cao, Lu Postdoctoral researcher at Karlsruhe Institute of Technology (KIT), Germany. She earned her Ph.D. in Experimental Hadronic Physics in Jülich Research Centre/ Bochum University in 2016, and Master’s degree on Theoretical Physics in Southwest University of China. She has worked on the experiments PANDA, Belle and Belle II, involved in the analyses of semileptonic B and D_s decays, pixel vertex detector R&D and tracking algorithm development. Since 2018, she has been the Vub/Vcb sub-group convener of the missing energy Physics working group at Belle II.