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Resonant and nonresonant contributions to the weak D → Vl + l - decays

Resonant and nonresonant contributions to the weak D → Vl + l - decays The Cabibbo suppressed decays D → Vl + l - ( V is light vector meson) present in principle the opportunity to observe the short distance FCNC transition c → ul + l - , which is sensitive to physics beyond the standard model. We analyze these as well as the Cabibbo allowed D → Vl + l - decays within the standard model, where in addition to the short distance dynamics also the long distance dynamics is present. The long distance contribution is induced by the effective nonleptonic weak Lagrangian accompanied by the emission of a virtual photon, which occurs resonantly via conversion from a vector meson ρ 0 , ω or φ or nonresonantly as direct emission from a D meson. We calculate the branching ratios for all D → Vl + l - decays using the model, which combines heavy quark symmetry and chiral perturbation theory. The short distance contribution due to c → ul + l - transition, which is present only in the Cabibbo suppressed decays, is found to be three orders of magnitude smaller than the long distance contribution. The branching ratios well above 10 - 7 for Cabibbo suppressed decays could signal new physics. The most frequent decays are the Cabibbo allowed decays, which are expected at the rates, that are not much lower than the present experimental upper limit: D s + → ρ + μ + μ - is expected at the branching ratio of approximately 3 × 10 - 5 , while D 0 → K * 0 μ + μ - is expected at 1.7 × 10 - 6 . http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review D American Physical Society (APS)

Resonant and nonresonant contributions to the weak D → Vl + l - decays

Physical Review D , Volume 58 (9) – Nov 1, 1998
14 pages

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Publisher
American Physical Society (APS)
Copyright
Copyright © 1998 The American Physical Society
ISSN
1089-4918
DOI
10.1103/PhysRevD.58.094038
Publisher site
See Article on Publisher Site

Abstract

The Cabibbo suppressed decays D → Vl + l - ( V is light vector meson) present in principle the opportunity to observe the short distance FCNC transition c → ul + l - , which is sensitive to physics beyond the standard model. We analyze these as well as the Cabibbo allowed D → Vl + l - decays within the standard model, where in addition to the short distance dynamics also the long distance dynamics is present. The long distance contribution is induced by the effective nonleptonic weak Lagrangian accompanied by the emission of a virtual photon, which occurs resonantly via conversion from a vector meson ρ 0 , ω or φ or nonresonantly as direct emission from a D meson. We calculate the branching ratios for all D → Vl + l - decays using the model, which combines heavy quark symmetry and chiral perturbation theory. The short distance contribution due to c → ul + l - transition, which is present only in the Cabibbo suppressed decays, is found to be three orders of magnitude smaller than the long distance contribution. The branching ratios well above 10 - 7 for Cabibbo suppressed decays could signal new physics. The most frequent decays are the Cabibbo allowed decays, which are expected at the rates, that are not much lower than the present experimental upper limit: D s + → ρ + μ + μ - is expected at the branching ratio of approximately 3 × 10 - 5 , while D 0 → K * 0 μ + μ - is expected at 1.7 × 10 - 6 .

Journal

Physical Review DAmerican Physical Society (APS)

Published: Nov 1, 1998

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