Studies of the resonance structure in D[superscript 0] → K[superscript ∓]π[superscript ±]π[superscript ±]π[superscript ∓] decays
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Author(s)
Aaij, R.
Adeva, B.
Adinolfi, M.
Ajaltouni, Z.
Akar, S.
Albrecht, J.
Alessio, F.
Alexander, M.
Alfonso Albero, A.
Ali, S.
Date Issued
June 2018
Journal
The European Physical Journal C
Publisher
Springer Berlin Heidelberg
Citation
LHCb Collaboration, et al. “Studies of the resonance structure in D[superscript 0] → K[supercript ∓]π[superscript ±]π[superscript ±]π[superscript ∓] decays.” The European Physical Journal C, vol. 78, no. 6, June 2018.
Version
Final published version
Abstract
Amplitude models are constructed to describe the resonance structure of D[superscript 0] → K[superscript -]π[superscript +]π[superscript +]π[superscript -] and D[superscript 0] → K[superscript +]π[superscript -]π[superscript -] π[superscript +] 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[superscript -1]. The largest contributions to both decay amplitudes are found to come from axial resonances, with decay modes D[superscript 0] → a[subscript 1](1260)[superscript +]K − and D[superscript 0] → K[subscript 1](1270/1400)[superscript +]π[superscript −] being prominent in D[superscript 0] → K [superscript −]π[superscript +]π[superscript +]π[superscript −] and D[supercript 0] → K[superscript +]π[superscript −]π[superscript −]π[superscript +], respectively. Precise measurements of the
lineshape parameters and couplings of the a1(1260)[superscript +],
K1(1270)[superscript −] and K(1460)[superscript −] resonances are made, and a quasi model-independent study of the K(1460)[superscript −] resonance is performed. The coherence factor of the decays is calculated from the amplitude models to be R[subscript K3π] = 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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1140/epjc/s10052-018-5758-4
