The t-channel W exchange interference in e+e- to nu nu-bar gamma at FCC-ee allows the Z-nu_e coupling to be measured with about 1% statistical error, a factor twenty better than current knowledge.
Measurement of the B^0 -> D^*- pi^+ pi^- pi^+ branching fraction
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abstract
Using a sample of (470.9 +- 2.8) x 10^6 BB-bar pairs, we measure the decay branching fraction B(B^0 -> D^*- pi^+ pi^- pi^+) = (7.26 +- 0.11 +- 0.31) x 10^-3, where the first uncertainty is statistical and the second is systematic. Our measurement will be helpful in studies of lepton universality by measuring B(B^0 -> D^*- tau^+ nu_tau) using tau^+ -> pi^+ pi^- pi^+ nu-bar_tau decays, normalized to B(B^0 -> D^*- pi^+ pi^- pi^+.
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Precision measurement of the Z boson to electron neutrino coupling at the future circular colliders
The t-channel W exchange interference in e+e- to nu nu-bar gamma at FCC-ee allows the Z-nu_e coupling to be measured with about 1% statistical error, a factor twenty better than current knowledge.