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Journal Articles Physics Letters B Year : 2014

Precision measurement of the ratio of the $\Lambda^0_b$ to $\overline{B}^0$ lifetimes

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R. Aaij
  • Function : Author
J. He
Marie Nicol
  • Function : Author
  • PersonId : 901312
J. Cogan
O. Leroy
J. Serrano

Abstract

The LHCb measurement of the lifetime ratio of the $\Lambda^0_b$ to the $\overline{B}^0$ meson is updated using data corresponding to an integrated luminosity of 3.0 fb$^{-1}$ collected using 7 and 8 TeV centre-of-mass energy $pp$ collisions at the LHC. The decay modes used are $\overline{B}^0\to J/\psi p K^-$ and $\overline{B}^0\to J/\psi \pi^+ K^-$, where the $\pi^+K^-$ mass is consistent with that of the $\overline{K}^{*0}(892)$ meson. The lifetime ratio is determined with unprecedented precision to be $0.974\pm0.006\pm0.004$, where the first uncertainty is statistical and the second systematic. This result is in agreement with original theoretical predictions based on the heavy quark expansion. Using the current world average of the $\overline{B}^0$ lifetime, the $\Lambda^0_b$ lifetime is found to be $1.479 \pm 0.009 \pm 0.010$ ps.

Dates and versions

in2p3-00952049 , version 1 (26-02-2014)

Identifiers

Cite

R. Aaij, Y. Amhis, S. Barsuk, O. Callot, J. He, et al.. Precision measurement of the ratio of the $\Lambda^0_b$ to $\overline{B}^0$ lifetimes. Physics Letters B, 2014, 734, pp.122-130. ⟨10.1016/j.physletb.2014.05.021⟩. ⟨in2p3-00952049⟩
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