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

LHCb Collaboration, Robert Appleby, Igor Babuschkin, Roger Barlow, William Barter, Sylvia Borghi, Christopher Burr, Lorenzo Capriotti, Stefano De Capua, Deepanwita Dutta, Evelina Gersabeck, Marco Gersabeck, Lucia Grillo, George Lafferty, Kevin Maguire, Andrew Mcnab, D Muller, Christopher Parkes, Gediminas Sarpis, Mark Williams

    Research output: Contribution to journalArticlepeer-review


    Amplitude models are constructed to describe the resonance structure of D0→K−π+π+π−D0→K−π+π+π− and D0→K+π−π−π+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−1fb−1 . The largest contributions to both decay amplitudes are found to come from axial resonances, with decay modes D0→a1(1260)+K−D0→a1(1260)+K− and D0→K1(1270/1400)+π−D0→K1(1270/1400)+π− being prominent in D0→K−π+π+π−D0→K−π+π+π− and D0→K+π−π−π+D0→K+π−π−π+ , respectively. Precise measurements of the lineshape parameters and couplings of the a1(1260)+a1(1260)+ , K1(1270)−K1(1270)− and K(1460)−K(1460)− resonances are made, and a quasi model-independent study of the K(1460)−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)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 γγ and studies of charm mixing and CPCP violation.
    Original languageEnglish
    JournalEuropean Physical Journal C. Particles and Fields
    Early online date2 Jun 2018
    Publication statusPublished - 2018


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