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- W2190907678 abstract "Amplitude models are constructed to describe the resonance structure of D0→K-π+π+π- and D0→K+π-π-π+ decays using pp collision data collected at centre-of-mass energies of 7 and 8 TeV with the LHCb experiment, corresponding to an integrated luminosity of 3.0 fb-1 . The largest contributions to both decay amplitudes are found to come from axial resonances, with decay modes D0→a1(1260)+K- and D0→K1(1270/1400)+π- being prominent in D0→K-π+π+π- and D0→K+π-π-π+ , respectively. Precise measurements of the lineshape parameters and couplings of the a1(1260)+ , K1(1270)- and K(1460)- resonances are made, and a quasi model-independent study of the K(1460)- resonance is performed. The coherence factor of the decays is calculated from the amplitude models to be RK3π=0.459±0.010(stat)±0.012(syst)±0.020(model) , which is consistent with direct measurements. These models will be useful in future measurements of the unitary-triangle angle γ and studies of charm mixing and CP violation." @default.
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