Studies of the resonance structure in D0→ Kπ±π±π decays

Research output: Contribution to journalArticlepeer-review

Authors

  • LHCb Collaboration

Colleges, School and Institutes

External organisations

  • Los Alamos National Laboratory
  • CERN
  • Universidad de Santiago de Compostela
  • University of Bristol
  • LPC
  • University of Cincinnati
  • TU Dortmund University, Germany
  • University of Glasgow
  • Universitat Autonoma de Barcelona
  • Nikhef National Institute for Subatomic Physics
  • Petersburg Nuclear Physics Institute (PNPI)
  • Imperial College London
  • Universidade Federal Do Rio de Janeiro
  • INFN Padova
  • IN2P3
  • Tsinghua University
  • Department of Physics and Astronomy and INFN
  • Ecole Polytechnique Federale de Lausanne
  • University of Maryland
  • University of Manchester
  • Ruprecht-Karls-Universität Heidelberg
  • Institute for High Energy Physics (IHEP)
  • Syracuse University
  • University of Zurich
  • University of Warwick
  • Pontifícia Universidade Católica Do Rio de Janeiro

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.

Details

Original languageEnglish
Article number443
JournalEuropean Physical Journal C
Volume78
Issue number6
Early online date2 Jun 2018
Publication statusE-pub ahead of print - 2 Jun 2018