# Measurement of the $B^0$--$\bar B^0$ oscillation frequency $\Delta m_d$ with the decays $B^0 \to D^- \pi^+$ and $B^0 \to J\ \psi K^{*0}$

Abstract : The $B^0$--$\bar B^0$ oscillation frequency $\Delta m_d$ is measured by the LHCb experiment using a dataset corresponding to an integrated luminosity of $1.0\,$fb$^{-1}$ of proton-proton collisions at $\sqrt{s} = 7\,$TeV, and is found to be $\Delta m_d = 0.5156 \pm 0.0051\,($stat.$) \pm 0.0033\,($syst.$)\,$ps$^{-1}$. The measurement is based on results from analyses of the decays $B^0 \to D^- \pi^+$ ($D^- \to K^+ \pi^- \pi^-$) and $B^0 \to J\ \psi K^{*0}$ ($J\ \psi \to \mu^+ \mu^-$, $K^{*0} \to K^+ \pi^-$) and their charge conjugated modes.
Document type :
Journal articles
Physics Letters B, Elsevier, 2013, 719, pp.318-325. <10.1016/j.physletb.2013.01.019>
Domain :

http://hal.in2p3.fr/in2p3-00749987
Contributor : Nicole Berger <>
Submitted on : Thursday, November 8, 2012 - 5:11:53 PM
Last modification on : Monday, February 11, 2013 - 3:32:06 PM

### Citation

R. Aaij, I. De Bonis, D. Decamp, Ph. Ghez, P. Hopchev, et al.. Measurement of the $B^0$--$\bar B^0$ oscillation frequency $\Delta m_d$ with the decays $B^0 \to D^- \pi^+$ and $B^0 \to J\ \psi K^{*0}$. Physics Letters B, Elsevier, 2013, 719, pp.318-325. <10.1016/j.physletb.2013.01.019>. <in2p3-00749987>

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