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Studies of the resonance structure in D0→ K∓π±π±π∓ decays

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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 f b−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.

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Società Italiana di Fisica & Springer Verlag

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European Physical Journal C, 2018, vol. 78, num. 6, p. 1-32

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cc-by (c) LHCb Collaboration (UB: Alfonso Albero, A. et al., 2018

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Articles publicats en revistes (Física Quàntica i Astrofísica)

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Large Hadron Collider (France and Switzerland)

# metadata.dc.title[].value
Studies of the resonance structure in D0→ K∓π±π±π∓ decays