Semileptonic and leptonic D decays at Belle II

Sumitted to PubDB: 2018-10-25

Category: Talk, Visibility: Public

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Authors	Alan Schwartz
Date	Sept. 18, 2018
Belle II Number	BELLE2-TALK-CONF-2018-126
Abstract	We present Belle II prospects for measuring leptonic and semileptonic decays of D mesons. The branching fraction of leptonic decays provides a measurement of the decay constant times the magnitude of CKM matrix elements Vcd or Vcs. The differential decay rate of semileptonic decays provides a measurement of the form factor f+ times the magnitude of Vcd or Vcs. Inputting values of the decay constant or form factor as calculated from lattice QCD allows one to determine \|Vcd\| or \|Vcs\| and thus test the unitarity of the CKM matrix. Belle II should collect about 50 times as much data as Belle collected and determine \|Vcd\| and \|Vcs\| with about 7 times better precision.
Conference	CKM 2018