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Search for flavor-changing-neutral-current d meson decays.

V M Abazov1, B Abbott, M Abolins

  • 1Joint Institute for Nuclear Research, Dubna, Russia.

Physical Review Letters
|March 21, 2008
PubMed

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Summary
This summary is machine-generated.

Researchers investigated the rare flavor-changing neutral current process in charm quarks. They found no evidence for the D+ to pi+ mu+ mu- decay, setting a new stringent limit on this rare particle physics process.

Area of Science:

  • Particle Physics
  • High-Energy Physics
  • Standard Model Physics

Background:

  • Flavor-changing neutral current (FCNC) processes are rare in the Standard Model.
  • Charm quark transitions provide a unique window to probe new physics beyond the Standard Model.
  • Previous searches for c -> u mu+ mu- transitions have yielded limited results.

Purpose of the Study:

  • To search for the flavor-changing neutral current decay D+ -> pi+ mu+ mu-.
  • To set a stringent upper limit on the branching fraction of this decay.
  • To constrain new physics scenarios contributing to charm quark transitions.

Main Methods:

  • Analysis of 1.3 fb^-1 of pp collisions at sqrt(s) = 1.96 TeV.
  • Utilized data from the D0 detector at the Fermilab Tevatron Collider.

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  • Searched for D+ -> pi+ mu+ mu- decays in the dimuon invariant mass spectrum, excluding the phi resonance region.

    • Main Results:

    • Clear indications of charged-current mediated D(s)+ and D+ decays to phi pi+ (via mu+ mu- pi+) were observed with >4 sigma significance.
    • No evidence for the neutral-current decay D+ -> pi+ mu+ mu- was found.
    • An upper limit on the branching fraction was set: B(D+ -> pi+ mu+ mu-) < 3.9 x 10^-6 at 90% C.L.

    Conclusions:

    • The study provides the most stringent constraint to date on new phenomena in the c -> u mu+ mu- transition.
    • The null result places significant limits on extensions to the Standard Model, such as supersymmetry or extra gauge bosons.
    • This result contributes to the ongoing effort to precisely measure rare charm decays and probe fundamental physics.