Summary of Charm Semileptonic Decay Results



Summarized below are parameters from fits to various experimental data on D meson decays.
The first section is for decays to pseudoscalars; the second is for decays to vector mesons.


Further details can be found in arXiv:0808.1297, Section 8.3.

D meson decays to Pseudoscalar Mesons

Results for mpole and αBK from various experiments for D0 → K- e+ ν and D+ → KS e+ ν decays. The last entry is a lattice QCD prediction.
D → K l ν Expt. Ref. m pole (GeV/c2) α BK
       
CLEO III Huang:2004fra 1.89 0.05+0.04-0.03 0.36 0.10+0.03-0.07
FOCUS Link:2004dh 1.93 0.05 0.03 0.28 0.08 0.07
BELLE Widhalm:2006wz 1.82 0.04 0.03 0.52 0.08 0.06
BaBar Aubert:2006mc 1.884 0.012 0.016 0.377 0.023 0.031
CLEO-c (D0 → K+) GaoICHEP06 1.943+0.037-0.033 0.011 0.258+0.063-0.065 0.020
CLEO-c (D0 → K+) Dobbs:2007sm 1.97 0.03 0.01 0.21 0.05 0.03
CLEO-c (D+ → KS) GaoICHEP06 2.02+0.07-0.06 0.02 0.127+0.099-0.104 0.031
CLEO-c (D+ → KS) Dobbs:2007sm 1.96 0.04 0.02 0.22 0.08 0.03
Fermilab lattice/MILC/HPQCD Aubin:2004ej -- 0.50 0.04

Pole mass and alpha for D to K semileptonic decays: In the table above and the figures below, the effective pole mass for the simple pole parameterization fits is shown on the left while the αBK parameter for the modified pole parameterization fits is shown on the right. The dashed red lines indicate the MD*s mass (left) and αBK≈1.75 (right) needed for the simplifications leading to the parameterizations to be physically valid.






Results for mpole and αBK from various experiments for D0 → π- e+ ν and D+ → π0 e+ ν decays. The last entry is a lattice QCD prediction.
D → π l ν Expt. Ref. m pole (GeV/c2) α BK
       
CLEO III Huang:2004fra 1.86+0.10+0.07-0.06-0.03 0.37+0.20-0.31 0.15
FOCUS Link:2004dh 1.91+0.30-0.15 0.07 --
BELLE Widhalm:2006wz 1.97 0.08 0.04 0.10 0.21 0.10
CLEO-c (D0 → π +) GaoICHEP06 1.941+0.042-0.034 0.009 0.20+0.10-0.11 0.03
CLEO-c (D0 → π +) Dobbs:2007sm 1.87 0.03 0.01 0.37 0.08 0.03
CLEO-c (D+ → π 0) GaoICHEP06 1.99+0.11-0.08 0.06 0.05+0.19-0.22 0.13
CLEO-c (D+ → π 0) Dobbs:2007sm 1.97 0.07 0.02 0.14 0.16 0.04
Fermilab lattice/MILC/HPQCD Aubin:2004ej -- 0.44 0.04

Pole mass and alpha for D to π semileptonic decays: In the table above and the figures below, the effective pole mass for the simple pole parameterization fits is shown on the left while the αBK parameter for the modified pole parameterization fits is shown on the right. The dashed red lines indicate the MD*s mass (left) and αBK≈1.75 (right) needed for the simplifications leading to the parameterizations to be physically valid.






Results for r1 and r2 from various experiments for D → π / K l ν. The correlation coefficient in each measurements is for to the total uncertainties (statistical and systematic) on the parameters.
Expt. mode Ref. r1 r2 ρ
         
CLEO III D0 → K+ Huang:2004fra 0.2+3.6-3.0 -89+104-120 -0.99
BaBar   Aubert:2006mc -2.5 0.2 0.2 0.6 6. 5. -0.64
CLEO-c   Dobbs:2007sm -2.4 0.4 0.1 21 11 2 -0.81
Average     -2.3 0.23 5.9 6.3 -0.74
CLEO-c D+ → KS Dobbs:2007sm -2.8 6 2 32 18 4 -0.84
CLEO-c D0 → π + Dobbs:2007sm -2.1 7 3 -1.2 4.8 1.7 -0.96
CLEO-c D+ → π 0 Dobbs:2007sm -0.2 1.5 4 -9.8 9.1 2.1 -0.97







D meson decays to Vector Mesons

The table below lists measurements of r2 and rV from several experiments which studied D+K*0l+ ν signals. The averaged results are also listed, as are recent measurements in other decay modes. These results are also displayed in the figures below.
D+K*0l+ ν Expt. Ref. rV r2
       
E691 E691:90 2.0 0.6 0.3 0.0 0.5 0.2
E653 E653:92 2.00 0.33 0.16 0.82 0.22 0.11
E687 E687:93 1.74 0.27 0.28 0.78 0.18 0.11
E791 (e) E791:98a 1.90 0.11 0.09 0.71 0.08 0.09
E791 ( μ ) E791:98b 1.84 0.11 0.09 0.75 0.08 0.09
Beatrice BEATRICE:99 1.45 0.23 0.07 1.00 0.15 0.03
FOCUS FOCUS:02b 1.504 0.057 0.039 0.875 0.049 0.064
Average   1.62 0.055 0.83 0.054
FOCUS FOCUS:05 1.706 0.677 0.342 0.912 0.370 0.104
D0K0 π - μ + ν      
BaBar BaBar:06 1.636 0.067 0.038 0.705 0.056 0.029
Ds+ → φ e+ ν      
CLEO Mahlke07 1.40 0.25 0.03 0.57 0.18 0.06
D0, D+ → ρ e ν      






References


Theory



Experiments






Last modified . Send comments to Milind Purohit or Lawrence Gibbons.