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Evidence for the decay D0-->K(-)pi(+)pi(-)e(+)nu(e).

M Artuso1, S Blusk, J Butt

  • 1Syracuse University, Syracuse, NY 13244, USA.

Physical Review Letters
|February 1, 2008
PubMed
Summary

This study reports the first measurement of the absolute branching fraction for the D0 decay into K(-)pi(+)pi(-)e(+)nu(e), a key process in particle physics. The results provide crucial data for understanding D0 meson decays and fundamental particle interactions.

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Area of Science:

  • Particle Physics
  • High Energy Physics
  • Quantum Chromodynamics

Background:

  • The D0 meson is a fundamental particle in the Standard Model.
  • Understanding D0 meson decays provides insights into fundamental forces and particle properties.
  • Previous measurements of D0 decays have limitations in precision and scope.

Purpose of the Study:

  • To present the first absolute branching fraction measurement for the decay D0-->K(-)pi(+)pi(-)e(+)nu(e).
  • To investigate the contribution of the K1(1270) resonance to this decay channel.
  • To provide precise experimental data for theoretical calculations and model validation.

Main Methods:

  • Analysis of a 281 pb{-1} data sample collected at the psi(3770) using the CLEO-c detector.
  • Identification and selection of candidate events for the decay D0-->K(-)pi(+)pi(-)e(+)nu(e).
  • Statistical analysis to determine the branching fraction and its uncertainties, including background estimation.

Main Results:

  • The absolute branching fraction for D0-->K(-)pi(+)pi(-)e(+)nu(e) was measured as (2.8{-1.1}{+1.4}±0.3)x10{-4} at a 4.0 standard deviation significance.
  • The product of branching fractions for D0-->K1-(1270)e(+)nu(e) and K1-(1270)-->K(-)pi(+)pi(-) was found to be (2.5{-1.0}{+1.3}±0.2)x10{-4}.
  • The branching fraction for D0-->K1-(1270)e(+)nu(e) was determined to be (7.6{-3.0}{+4.1}±0.6±0.7)x10{-4}.

Conclusions:

  • The study successfully measured the absolute branching fraction of the D0-->K(-)pi(+)pi(-)e(+)nu(e) decay.
  • The results indicate a significant contribution from the K1(1270) resonance in this decay channel.
  • This precise measurement serves as a valuable benchmark for theoretical models of heavy meson decays.