https://doi.org/10.1140/epjc/s10052-024-12869-5
Regular Article - Theoretical Physics
Short- vs. long-distance physics in
: a data-driven analysis
1
Theoretical Physics Department, CERN, 1211 , Geneva 23, Switzerland
2
Physik-Institut, Universität Zürich, 8057, Zurich, Switzerland
Received:
8
February
2024
Accepted:
28
April
2024
Published online:
31
May
2024
We analyze data on and
decays in the whole dilepton invariant mass spectrum with the aim of disentangling short- vs. long-distance contributions. The sizable long-distance amplitudes from
narrow resonances are taken into account by employing a dispersive approach. For each available
bin and each helicity amplitude an independent determination of the Wilson coefficient
, describing
transitions at short distances, is obtained. The consistency of the
values thus obtained provides an a posteriori check of the absence of additional, sizable, long-distance contributions. The systematic difference of these values from the Standard Model expectation supports the hypothesis of a non-standard
amplitude of short-distance origin.
© The Author(s) 2024
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