Measurement of the (B)over-bar(s)(0) Meson Lifetime in D-s(+)pi(-) Decays

LHCb collaboration

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We present a measurement of the ratio of the (B) over bar (0)(s) meson lifetime, in the flavor-specific decay to D-s(+)pi(-), to that of the (B) over bar (0) meson. The pp collision data used correspond to an integrated luminosity of 1 fb(-1), collected with the LHCb detector, at a center-of-mass energy of 7 TeV. Combining our measured value of 1.010 +/- 0.010 +/- 0.008 for this ratio with the known (B) over bar (0) lifetime, we determine the flavor-specific (B) over bar (0)(s) lifetime to be tau((B) over bar (0)(s) ) = 1.535 +/- 0.015 +/- 0.014 ps, where the uncertainties are statistical and systematic, respectively. This is the most precise measurement to date, and is consistent with previous measurements and theoretical predictions.
Original languageEnglish
Article number172001
Number of pages9
JournalPhysical Review Letters
Issue number17
Publication statusPublished - 24 Oct 2014
Externally publishedYes


  • B-S(0)
  • LAMBDA(0)(B)

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