Measurement of the B0B0 oscillation frequency using l−D*+ pairs and lepton flavor tags

Le résumé fourni par la source

The oscillation frequency $\ensuremath{\Delta}{m}_{d}$ of ${B}^{0}{B}^{0}$ mixing is measured using the partially reconstructed semileptonic decay ${B}^{0}\ensuremath{\rightarrow}{l}^{\ensuremath{-}}\overline{\ensuremath{\nu}}{D}^{*+}X.$ The data sample was collected with the CDF detector at the Fermilab Tevatron collider during 1992--1995 by triggering on the existence of two lepton candidates in an event, and corresponds to about 110 ${\mathrm{pb}}^{\ensuremath{-}1}$ of $\overline{p}p$ collisions at $\sqrt{s}=1.8$ TeV. We estimate the proper decay time of the ${B}^{0}$ meson from the measured decay length and reconstructed momentum of the ${l}^{\ensuremath{-}}{D}^{*+}$ system. The charge of the lepton in the final state identifies the flavor of the ${B}^{0}$ meson at its decay. The second lepton in the event is used to infer the flavor of the ${B}^{0}$ meson at production. We measure the oscillation frequency to be $\ensuremath{\Delta}{m}_{d}=0.516\ifmmode\pm\else\textpm\fi{}{0.099}_{\ensuremath{-}0.035}^{+0.029}$ ${\mathrm{ps}}^{\ensuremath{-}1}$, where the first uncertainty is statistical and the second is systematic.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.