Based on a sample of 500 million e+e−→cc¯ events recorded by the BABAR detector at c.m. energies of close to 10.6 GeV, we report on a study of the decay D0→π−e+νe. We measure the ratio of branching fractions, RD=ℬ(D0→π−e+νe)/ℬ(D0→K−π+)=0.0713±0.0017stat±0.0024syst, and use the present world average for ℬ(D0→K−π+) to obtain ℬ(D0→π−e+νe)=(2.770±0.068stat±0.092syst±0.037ext)×10−3 where the third error accounts for the uncertainty on the branching fraction for the reference channel. The measured dependence of the differential branching fraction on q2, the four-momentum transfer squared between the D and the π meson, is compared to various theoretical predictions for the hadronic form factor, fπ+,D(q2), and the normalization |Vcd|×fπ+,D(q2=0)=0.1374±0.0038stat±0.0022syst±0.0009ext. is extracted from a fit to data. Using the most recent LQCD prediction of fπ+,D(q2=0)=0.666±0.029, we obtain |Vcd|=0.206±0.007exp±0.009LQCD. Assuming, instead, |Vcd|=|Vus|=0.2252±0.0009, we obtain fπ+,D(q2=0)=0.610±0.020exp±0.005ext. The q2 dependence of fπ+,D(q2) is compared to a variety of multipole parametrizations. This information is applied to B0→π−e+νe decays and, combined with an earlier B0→π−e+νe measurement by BABAR, is used to derive estimates of |Vub|.

Lees, J.P., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., et al. (2015). Measurement of the D-0 -> pi(-)e(+)nu(e) differential decay branching fraction as a function of q(2) and study of form factor parametrizations. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 91(5), 1-25 [10.1103/PhysRevD.91.052022].

Measurement of the D-0 -> pi(-)e(+)nu(e) differential decay branching fraction as a function of q(2) and study of form factor parametrizations

PATRIGNANI, CLAUDIA;
2015

Abstract

Based on a sample of 500 million e+e−→cc¯ events recorded by the BABAR detector at c.m. energies of close to 10.6 GeV, we report on a study of the decay D0→π−e+νe. We measure the ratio of branching fractions, RD=ℬ(D0→π−e+νe)/ℬ(D0→K−π+)=0.0713±0.0017stat±0.0024syst, and use the present world average for ℬ(D0→K−π+) to obtain ℬ(D0→π−e+νe)=(2.770±0.068stat±0.092syst±0.037ext)×10−3 where the third error accounts for the uncertainty on the branching fraction for the reference channel. The measured dependence of the differential branching fraction on q2, the four-momentum transfer squared between the D and the π meson, is compared to various theoretical predictions for the hadronic form factor, fπ+,D(q2), and the normalization |Vcd|×fπ+,D(q2=0)=0.1374±0.0038stat±0.0022syst±0.0009ext. is extracted from a fit to data. Using the most recent LQCD prediction of fπ+,D(q2=0)=0.666±0.029, we obtain |Vcd|=0.206±0.007exp±0.009LQCD. Assuming, instead, |Vcd|=|Vus|=0.2252±0.0009, we obtain fπ+,D(q2=0)=0.610±0.020exp±0.005ext. The q2 dependence of fπ+,D(q2) is compared to a variety of multipole parametrizations. This information is applied to B0→π−e+νe decays and, combined with an earlier B0→π−e+νe measurement by BABAR, is used to derive estimates of |Vub|.
2015
Lees, J.P., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., et al. (2015). Measurement of the D-0 -> pi(-)e(+)nu(e) differential decay branching fraction as a function of q(2) and study of form factor parametrizations. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 91(5), 1-25 [10.1103/PhysRevD.91.052022].
Lees, J. P.; Poireau, V.; Tisserand, V.; Grauges, E.; Palano, A.; Eigen, G.; Stugu, B.; Brown, D. N.; Kerth, L. T.; Kolomensky, Yu. G.; Lee, M. J.; Ly...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/534816
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