Search for D0-D0bar Mixing Using Semileptonic Decay Modes

Abstract

Based on an 87-fb${}^{-1}$ dataset collected by the Babar detector at the PEP-II asymmetric-energy $B$-Factory, a search for $D^0$--${\bar{D}}^0$ mixing has been made using the semileptonic decay modes $D^{\ast +}\to {\pi }^{+}{D}^0,D^0\to K^{(\ast )}e\nu$ (+c.c.). The use of these modes allows unambiguous flavor tagging and a combined fit of the $D^0$ decay time and $D^{\ast +}$--$D^0$ mass difference ($\Delta M$) distributions. The high-statistics sample of unmixed semileptonic $D^0$ decays is used to model the $\Delta M$ distribution and time-dependence of mixed events directly from the data. Neural networks are used to select events and reconstruct the $D^0$. A result consistent with no charm mixing has been obtained, $R_{\mathrm{mix}}=0.0023\pm 0.0012\pm 0.0004$. This corresponds to an upper limit of $R_{\mathrm{mix}}<0.0042$ (90% CL).

submitted to Phys. Rev. D (Rapid Communications)

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• D-Dbar mixing and new physics: general considerations and constraints on the MSSM
• Time-Independent Measurements of D0-D0bar Mixing and Relative Strong Phases Using Quantum Correlations
• Search for D^0 - barD^0 Mixing in the Dalitz Plot Analysis of D^0 --> K_S^0 pi^+ pi^-
• The Effect of $D-\bar{D}$ Mixing on the Measurement of $\gamma$ in $B\to DK$ Decays
• Search for $D^0-{\bar{D}}^0$ Mixing Using Doubly Flavor Tagged Semileptonic Decay Modes
• Dispersive and Absorptive CP Violation in $D^0-\overline{D^0}$ Mixing
• Limits on Neutral D Mixing in Semileptonic Decays
• Improved search for D^0 mixing using semileptonic decays at Belle
• Search for D^0-\bar{D^0} mixing using semileptonic decays at Belle
• The UTfit Collaboration Average of D meson mixing data: Spring 2012
• The UTfit Collaboration Average of $D$ meson mixing data: Winter 2014
• Charm Meson Mixing: An Experimental Review