Bulletin of the American Physical Society
2005 APS April Meeting
Saturday–Tuesday, April 16–19, 2005; Tampa, FL
Session C8: Charm Physics I |
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Sponsoring Units: DPF Chair: Sarah Eno, University of Maryland Room: Marriott Tampa Waterside Room 4 |
Saturday, April 16, 2005 1:30PM - 1:42PM |
C8.00001: Observation of $D_s^{**}$ states in semileptonic$B$ decays Jason Rieger Using 460 pb$^{-1}$ of integrated luminosity accumulated with the D\O\ detector, we have observed the semileptonic decays $B \rightarrow \mu \mu D^{**}_s$ where the different excited $D^{**}_s$ are reconstructed in the mode $D^{**}_s \rightarrow D^{*} K^0_S$. Mass peaks in the invariant mass of $D^{*} K^0_S$ are presented. [Preview Abstract] |
Saturday, April 16, 2005 1:42PM - 1:54PM |
C8.00002: Charm mixing and CP violation at CDF Kim Giolo Mixing and CP violation in the charm sector are considerably smaller than that in $b$-sector, and therefore could be sensitive to effects from new physics. The CDF experiment has an active program of precision charm physics exploiting the large sample of fully reconstructed charm decays obtained with the diplaced vertex trigger. Two analyses are searching for evidence for $D^0$-$\bar{D}^0$ mixing; one based on meauring $\Delta\Gamma$ in $D^0\rightarrow\pi^+\pi^-$ or $K^+K^-$, and the other searching for time dependence in doubly cabibbo suppressed $D^0\rightarrow K^+\pi^-$ decays. Comparison of the decay $D^+\rightarrow\pi^+\pi^+\pi^-$ to the charge conjugate reaction is sensitive to CP violation. [Preview Abstract] |
Saturday, April 16, 2005 1:54PM - 2:06PM |
C8.00003: Search for the Doubly-Cabibbo Suppressed Decay $D^+\to K^+\pi^0$ Dirk Hufnagel Hadronic decays of charged D mesons are an important tool to study the dynamics of heavy quark decays. These measurements can provide insights into the violation of the SU(3) flavor symmetry and isospin symmetry. Observing the doubly Cabbibo-suppressed decay of a D+ meson into a positive kaon and a neutral pion will be valuable for mixing studies in the neutral D meson system as they will shed a light on the size of the SU(3) flavor violating effects in D meson decays. Using the large sample of charm decays collected with the BaBar detector at the Stanford Linear Accelerator Center we have searched for these rare decays. Status of the analysis and first results will be presented. [Preview Abstract] |
Saturday, April 16, 2005 2:06PM - 2:18PM |
C8.00004: Search for $D^0-\overline{D}{}^0$ mixing using semileptonic decays at Belle Urban Bitenc, Bostjan Golob We report the results of a search for mixing in the neutral D meson system using the semileptonic decay $D^0\to K^- e^+\nu$, tagging the D meson flavor at production by the charge of the slow pion in the decay $D^{*+}\to D^0\pi^+$. The analysis is performed using 253~fb$^{-1}$ of data recorded by the Belle detector. Background contributions are described using the reconstructed data. We reconstruct the momentum of the final state neutrino by exploiting the detector hermeticity and kinematic constraints. [Preview Abstract] |
Saturday, April 16, 2005 2:18PM - 2:30PM |
C8.00005: Exclusive semileptonic decays of $D$ mesons produced in the reaction $\psi(3770) \to D\overline D$ Batbold Sanghi Initial running of the CLEO-c detector in the fall of 2003 and the winter of 2004 has provided the world's largest sample of $\psi(3770)$ decays. Using this data sample, we have reconstructed $D$ mesons decaying to hadronic final states and have used them to tag events with a charm-anti-charm meson pair. Measurements of absolulte branching ratios for a variety of semileptonic decay modes of $D^0$ and $D^+$ mesons will be presented. [Preview Abstract] |
Saturday, April 16, 2005 2:30PM - 2:42PM |
C8.00006: Neutrino Spectrum from Semileptonic $D$ Decays Michael Weinberger A preliminary measurement of the neutrino energy spectrum from semileptonic decays of the $D$ meson will be presented. The data analyzed was obtained by the CLEO-c detector, and was taken with center of mass energy at the $\psi$(3770). The signal $D$ is found by tagging a $D$ on the opposite side of the event. The cleanliness of the event then allows the neutrino energy to be found by conservation laws. The methods for separating signal from background will also be discussed. [Preview Abstract] |
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