Precision measurement of the ratio of the to lifetimes
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The LHCb measurement of the lifetime ratio of the View the MathML source baryon to the View the MathML source 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 View the MathML source and a3f9f72cc5d3e5d90e3654f8">View the MathML source, where the +K mass is consistent with that of the View the MathML source meson. The lifetime ratio is determined with unprecedented precision to be a38f5a" title="Click to view the MathML source">0.974±0.006±0.004, 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 View the MathML source lifetime, the View the MathML source lifetime is found to be a39b1676bd89b" title="Click to view the MathML source">1.479±0.009±0.010 ps.

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