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Related Experiment Videos

Search for rare and forbidden decays D+ --> h+/- e+/- e+.

Q He1, H Muramatsu, C S Park

  • 1University of Rochester, Rochester, New York 14627, USA.

Physical Review Letters
|December 31, 2005
PubMed

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Summary
This summary is machine-generated.

Researchers found no evidence of rare D+ meson decays into dielectron states. This study sets new upper limits for flavor-changing neutral current and lepton-number-violating decays of D+ mesons.

Area of Science:

  • Particle Physics
  • High Energy Physics
  • Quantum Chromodynamics

Background:

  • The Standard Model of particle physics allows for rare decays, but their observation provides crucial tests of fundamental principles.
  • Flavor-changing neutral current (FCNC) and lepton-number-violating (LNV) decays are particularly sensitive probes of new physics beyond the Standard Model.
  • The D+ meson, a charm-containing meson, offers a unique system to study these exotic decay modes due to its specific quark content.

Purpose of the Study:

  • To search for evidence of FCNC and LNV decays of the D+ meson into final states containing dielectrons.
  • To establish stringent upper limits on the branching fractions of these rare decay processes.
  • To constrain theoretical models that predict new physics phenomena by comparing experimental results with theoretical calculations.

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Main Methods:

  • Analysis of 0.8 x 10^6 D+ D- pairs collected by the CLEO-c detector operating at the psi(3770) resonance.
  • Selection of events consistent with D+ meson decays into final states with two electrons (dielectrons).
  • Statistical analysis to set upper limits on branching fractions at a 90% confidence level, assuming no signal is observed.

Main Results:

  • No significant signal was observed for any of the searched decay modes.
  • The 90% confidence level upper limits on branching fractions were determined to be B(D+ --> pi+ e+ e-) < 7.4 x 10^-6, B(D+ --> pi- e+ e+) < 3.6 x 10^-6, B(D+ --> K+ e+ e-) < 6.2 x 10^-6, and B(D+ --> K- e+ e+) < 4.5 x 10^-6.
  • These results represent some of the most stringent limits to date for these specific D+ meson decay modes.

Conclusions:

  • The absence of observed signals for FCNC and LNV decays into dielectrons places strong constraints on extensions to the Standard Model.
  • The established upper limits provide valuable data for theoretical physicists developing models of new physics.
  • Further studies with larger datasets or improved analysis techniques may be necessary to probe even rarer decay modes or smaller branching fractions.