Jul 4 – 11, 2018
COEX, SEOUL
Asia/Seoul timezone

Precise measurement of the $D^{*}(2010)^+ - D^+$ mass difference

Jul 5, 2018, 5:40 PM
15m
101 (COEX, Seoul)

101

COEX, Seoul

Parallel Strong Interactions and Hadron Physics Strong Interactions and Hadron Physics

Speaker

Dr Liang Sun (Wuhan University (CN))

Description

We measure the mass difference, $\Delta m_+$, between the $D^{*}(2010)^+$ and the $D^+$, using the decay chain $D^{*}(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 $\Upsilon(4S)$ resonance, and correspond to an integrated luminosity of approximately $468 \, \mbox{fb}^{-1}$. We measure   $\Delta m_+ = \left(140\,601.0 \pm 6.8\,[{\rm stat}] \pm 12.9 \,[{\rm syst}]\right) \, \mbox{keV} $. 
We combine this result with a previous BaBar measurement of $\Delta m_0\equiv m(D^{*}(2010)^+) - m (D^0)$ to obtain  $\Delta m_D =  m(D^+) - m(D^0) = \left(4\,824.9 \pm 6.8\,[{\rm stat}] \pm12.9\,[{\rm syst}]\right) \, \mbox{keV}$.
These results are compatible with, and approximately five times more precise than, previous world averages.

Primary authors

Fabio Anulli (Sapienza Universita e INFN, Roma I (IT)) Dr Liang Sun (Wuhan University (CN))

Presentation materials