Adding the a1(1260)pi cascade to the Standard Model isobar description of D0 -> pi+ pi- l+ l- substantially improves agreement with LHCb data and changes several angular observables.
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Impact of the $a_1(1260) \pi$ cascade contribution on $D^0 \to \pi^+ \pi^- \ell^+ \ell^-$ decays
Adding the a1(1260)pi cascade to the Standard Model isobar description of D0 -> pi+ pi- l+ l- substantially improves agreement with LHCb data and changes several angular observables.