Nuclear uncertainties in superallowed decays and V ud Misha - PowerPoint PPT Presentation

Apr 10, 2024 •157 likes •397 views

Nuclear uncertainties in superallowed decays and V ud Misha Gorshteyn Mainz University Collaborators: Chien-Yeah Seng (U. Shanghai -> U. Bonn) Hiren Patel (U. Mass. -> UC Santa Cruz) Michael Ramsey-Musolf (U. Mass.) C-Y Seng, MG, H

Nuclear uncertainties in superallowed decays and V ud Misha Gorshteyn Mainz University Collaborators: Chien-Yeah Seng (U. Shanghai -> U. Bonn) Hiren Patel (U. Mass. -> UC Santa Cruz) Michael Ramsey-Musolf (U. Mass.) C-Y Seng, MG, H Patel, M J Ramsey-Musolf, arXiv: 1807.10197 C-Y Seng, MG, H Patel, M J Ramsey-Musolf, arXiv: 1811.XXXX MG, arXiv: 1811.XXXX November 1, 2018 — Workshop “Beta decay as a Probe of New Physics”, ACFI UMass, Amherst, Massachusetts
�� Current status of V ud and CKM unitarity | V ud | 2 + | V us | 2 + | V ub | 2 = 0 . 9994 ± 0 . 0005 | V ud | 2 = 0 . 94906 ± 0 . 00041 0 + -0 + nuclear decays | V us | 2 = 0 . 05031 ± 0 . 00022 K decays �� CKM unitarity: V ud the main contributor to the sum and to the uncertainty | V ub | 2 = 0 . 00002 B decays 2
�� Why are superallowed decays special? Superallowed 0 + -0 + nuclear decays: - only conserved vector current (unlike the neutron decay and other mirror decays) - many decays (unlike pion decay) - all decay rates should be the same modulo phase space Experiment: f - phase space (Q value) and t - partial half-life (t 1/2 , branching ratio) ft values: same within ~2% but not exactly! Reason: SU(2) slightly broken a. RC (e.m. interaction does not conserve isospin) b. Nuclear WF are not SU(2) symmetric (proton and neutron distribution not the same) 3

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