CIPANP 2018 - Thirteenth Conference on the Intersections of Particle and Nuclear Physics

Precise Measurement of the D⋆(2010)+−D+ Mass Difference

29 May 2018, 17:00

20m

North Foyer | Joshua Tree Room (Hyatt Regency Indian Wells Conference Center)

Parallel QCDHS QCD, Hadron Spectroscopy, and Exotics

Speaker

Prof. Abner Soffer (Tel Aviv University)

Description

We measure the mass difference, $\mathrm{\Delta }{m}_{+}$, between the $D^{\star }(2010{)}^{+}$ and the $D^{+}$, using the decay chain $D^{\star }(2010{)}^{+}\to D^{+}{\pi }^0$ with $D^{+}\to K^{-}{\pi }^{+}{\pi }^{+}$. The data were recorded with the BaBar detector at center-of-mass energies at and near the $\mathrm{{\rm Y}}$(4S) resonance, and correspond to an integrated luminosity of approximately 468 fb${}^{-1}$. We measure $\mathrm{\Delta }{m}_{+}=(140,601.0\pm 6.8[\mathrm{stat}]\pm 12.9[\mathrm{syst}])$ keV. We combine this result with a previous BaBar measurement of $\mathrm{\Delta }{m}_0\equiv m(D^{\star }(2010{)}^{+})-m(D^0)$ to obtain $\mathrm{\Delta }{m}_D=m(D^{+})-m(D^0)=(4,824.9\pm 6.8[\mathrm{stat}]\pm 12.9[\mathrm{syst}])$ keV. These results are compatible with, and approximately five times more precise than, previous world averages.

Presentation materials

Slides

170-0-Soffer-CIPANP18-parallel.pdf