2015/09/14 by A. Oyanguren, Oyanguren, Arantza
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.1509.04019
openalex publication_date 2015/09/14 · openalex created_date 2022/10/06 · openalex updated_date 2026/07/28
In this talk results of the study of the D0 → π- e+ ν decay channel, recorded by the BaBar detector at the c.m. energy close to 10.6 GeV, are reported. The branching fraction of this channel is measured relative to the D0 → K- π+ decay. The hadronic form factor, f+,Dπ(q2), function of q2, the four momentum transfer squared between the D and the π mesons, is compared to various theoretical predictions, and the normalization Vcd × f+,Dπ(q2=0) is extracted from a fit to data. Results are compared with Lattice QCD calculations. A new multipole model is applied which makes use of present information of resonant states contributing to the form factor. With the understanding of the f+,Dπ(q2) form factor, and provided the relation between the D0 → π- e+ ν and B0 → π- e+ ν decay widths at the same pion energy, the CKM matrix element Vub is determined and compared to recent measurements. This method of extracting Vub will become competitive with new Lattice QCD calculations of the ratio of form factors.