22-29 July 2015
Europe/Vienna timezone

Measurement of the D -> pi- e+ nu partial branching fraction and form factor, and implications for Vub.

Jul 24, 2015, 9:30 AM


talk Flavour Physics and Fundamental Symmetries Flavour Physics and Fundamental Symmetries


Arantza Oyanguren (IFIC - Univers. de Valencia)


Precision measurements of the D -> pi e+ nu form factor could shed new light on the persistent difference between inclusive and exclusive measurements of Vub. We report the measurement of the partial branching fraction of D -> pi e+ nu in intervals of the four-momentum-transfer squared from D to pi using 347.2 /fb of integrated luminosity of the BaBar data. The D -> pi form factor is extracted with fits to the unfolded partial branching fraction using pole or generalized expansions and the value at zero recoil is determined. These form factors are compared to the current world average, the available lattice predictions, and interpreted with the expectation of a single dominant pole term. The measured form factor is then combined with previous BABAR B -> pi l nu information to determine a value of Vub.

Primary author

Arantza Oyanguren (IFIC - Univers. de Valencia)

Presentation materials