Bulletin of the American Physical Society
2006 APS April Meeting
Saturday–Tuesday, April 22–25, 2006; Dallas, TX
Session L12: Exclusive D Meson Decays |
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Sponsoring Units: DPF Chair: Todd Pedlar, Luther College Room: Hyatt Regency Dallas Cumberland F |
Sunday, April 23, 2006 3:15PM - 3:27PM |
L12.00001: A study of the Decays $D \rightarrow K,\ \pi e \nu$ Batbold Sanghi The CLEO-c experiment at the CESR $e^+e^-$ collider has collected 281$ {\rm pb}^{-1}$ of data at the $\psi(3770)$ resonance. Using this data sample, we have reconstructed events where one $D$ meson has decayed into a hadronic final state and the other $D$ meson has decayed as $D \rightarrow K e\nu$ or $D \to\pi e \nu$. In this talk we present improved measurements of the absolute semileptonic branching ratios and form factors in $D \rightarrow K,\pi e \nu$. We fit the $q^2$ distributions using several form factor models and measure $V_{cs(d)}\times f_+(0)$. Using $V_{cs(d)}$ values obtained from the unitarity of the CKM matrix, $f_+(q^2)$ is measured and compared with LQCD predictions. We also report measurements of $V_{cs}$ and $V_{cd}$. [Preview Abstract] |
Sunday, April 23, 2006 3:27PM - 3:39PM |
L12.00002: A Study of the Charmed Semileptonic Decays $D^0 \to K^{\pm} e \nu$, $D^0 \to \pi^{\pm} e \nu$, $D^{\pm} \to K^0 e \nu$ and $D^{\pm} \to \pi^0 e \nu$ Nadia Adam Using a sample of 1.8 million $D\bar{D}$ mesons collected at the $\psi(3770)$ with the CLEO detector, and a reconstruction method based on the full event hermeticity, we measure branching fractions and branching fraction ratios for the four exclusive semileptonic decay modes $D^0 \to K^{\pm} e \nu$, $D^0 \to \pi^{\pm} e \nu$, $D^{\pm} \to K^0 e \nu$ and $D^{\pm} \to \pi^0 e \nu$. Form factors are measured using a fit to the branching fraction results in five $q^2$ bins. Three form factor models are explored, the simple pole model, the modified pole model and a series parameterization model. In addition we fit for the CKM matrix element $|V_{cs}|$ and the ratio $|V_{cd}\slash |V_{cs}|$. [Preview Abstract] |
Sunday, April 23, 2006 3:39PM - 3:51PM |
L12.00003: Study of the Decay $D \to \rho e \nu$ Guangshun Huang Using 281 pb$^{-1}$ of data collected with the CLEO-c detector at the $\psi(3770)$ resonance, we discuss improvements on branching fraction measurements and studies of form factors for the semileptonic decays $D^0 \to \rho^- e^+ \nu$ and $D^+ \to \rho^0 e^+ \nu$. [Preview Abstract] |
Sunday, April 23, 2006 3:51PM - 4:03PM |
L12.00004: Studies of Rare Semileptonic $D$ meson Decays Bo Xin Using a 281 $ {\rm pb}^{-1}$ data sample collected by the CLEO-c detector at the $\psi(3770)$ resonance, we search for rare semileptonic $D$ meson decay modes, including $\eta e \nu$, $\eta' e \nu$ and $\phi e \nu$. [Preview Abstract] |
Sunday, April 23, 2006 4:03PM - 4:15PM |
L12.00005: Investigation of $D^+\to\tau^+\nu$ Nabil Menaa Using data taken with the CLEO-c detector at the $\psi(3770)$ resonance, we compare our recent measurement of ${\cal{B}}(D^+\to\mu^+\nu)$ with ${\cal{B}}(D^+\to\tau^+\nu)$. The ratio of branching ratios should be 2.65 in the Standard Model with any deviation indicating a breakdown of lepton universality. [Preview Abstract] |
Sunday, April 23, 2006 4:15PM - 4:27PM |
L12.00006: Measurement of the ratio of branching fractions $ {\cal B}(D^0 \to K^+ \pi^-)/{\cal B}(D^0 \to K^- \pi^+)$ using the CDF II Detector Robert Harr We present a preliminary measurement of the ratio, $R_D$, of the branching fraction for the doubly Cabibbo-suppressed decay $D^0 \to K^+ \pi^-$ to that for the Cabibbo-favored decay $D^0 \to K^- \pi^+$. Charge conjugate decays are implicitly included. A signal of $2005 \pm 104$ events for the decay $D^0 \to K^+ \pi^-$ is obtained using the CDF II detector at the Fermilab Tevatron collider. The data set corresponds to an integrated luminosity of 0.35 $fb^{-1}$ produced in $\bar{p}p$ collisions at $\sqrt{s}=1.96$ TeV. Assuming no mixing and no CP violation, we find $R_D = 4.05 \pm 0.21 (\mbox{stat.}) \pm 0.12 (\mbox{syst.}) \times 10^{-3}$. This measurement is consistent with the world average, and comparable in accuracy with the best measurements from other experiments. [Preview Abstract] |
Sunday, April 23, 2006 4:27PM - 4:39PM |
L12.00007: $D \to KK$ decays Hiro Miyake The CLEO-c experiment at the CESR $e^+ e^-$ collider has collected 281~pb$^{-1}$ of data at the $\psi(3770)$ resonance. Using this data sample we have studied Cabibbo suppressed decays of $D$ mesons to final states with kaons. We present preliminary results for the branching fractions of the two-body decays $D^0\to K^+ K^-$, $D^0\to K^0_S K^0_S$, and $D^+\to K^+K^0_S$. [Preview Abstract] |
Sunday, April 23, 2006 4:39PM - 4:51PM |
L12.00008: A measurement of the relative phases and amplitudes of $D0 \to K^{*+}K^-$ and $D0 \to K^{*-}K^+$ Paras Naik Using a Dalitz Plot technique to investigate $D^0 \to K^+K^-\pi^0$ decays in the CLEO~III data set, we have measured the relative amplitudes and phases of the charmed decays $D^0 \to K^{*+}K^-$ and $D^0 \to K^{*-}K^+$. [Preview Abstract] |
Sunday, April 23, 2006 4:51PM - 5:03PM |
L12.00009: Search for the decay D to mu mu at CDF Run II Edmund Berry We report on a search for the flavor-changing neutral current decay D0 to mu+mu- in pp-bar collisions at sqrt = 1.96 TeV using 330 pb-1 of data collected by the CDF experiment at the Fermilab Tevatron Collider. A displaced-track trigger selects long-lived D0 candidates in the D0 to mu+mu- search channel. The kinematically similar D0 to pi+pi- channel is used for normalization, and the Cabbibo-favored D0 to K-pi+ channel is used to optimize the selection criteria in an unbiased manner. This analysis is an extension of a previous search using 65 pb-1 of data, when a limit was set on the branching fraction, B(D0 to mu+mu-) less than 2.5 x 10(-6) at the 90 percent confidence level. [Preview Abstract] |
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