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Observation of B-s0-Bs0 mixing and measurement of mixing frequencies using semileptonic B decays
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LHCb Collaboration (Including: Back, J. J., Craik, Daniel, Dossett, D., Gershon, T. J., Kreps, Michal, Latham, Thomas, Pilar, T., Poluektov, Anton, Reid, Matthew M., Silva Coutinho, R., Wallace, Charlotte, Whitehead, M. (Mark) and Williams, M. P.). (2013) Observation of B-s0-Bs0 mixing and measurement of mixing frequencies using semileptonic B decays. European Physical Journal C, Volume 73 (Number 12). Article number 2655. doi:10.1140/epjc/s10052-013-2655-8
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Official URL: http://dx.doi.org/10.1140/epjc/s10052-013-2655-8
Abstract
The B0
s
and B0 mixing frequencies, [triangle]ms and
[triangle]md, are measured using a data sample corresponding to an
integrated luminosity of 1.0 fb−1 collected by the LHCb experiment
in pp collisions at a centre of mass energy of 7 TeV
during 2011. Around
1.8×106 candidate events are selected
of the type B0
(s)
→ D−
(s)
μ+ (+ anything), where about half
are from peaking and combinatorial backgrounds. To determine
the B decay times, a correction is required for the
momentum carried by missing particles, which is performed
using a simulation-based statistical method. Associated production
of muons or mesons allows us to tag the initialstate
flavour and so to resolve oscillations due to mixing.
We obtain
[triangle]ms
=
.
17.93
±
0.22(stat)
±
0.15(syst)
.
ps−1 ,
[triangle]md
=
.
0.503
±
0.011(stat)
±
0.013(syst)
.
ps−1 .
The hypothesis of no oscillations is rejected by the equivalent
of 5.8 standard deviations for B0
s
and 13.0 standard deviations
for B0 . This is the first observation of B0
s
mixing to
be made using only semileptonic decays.
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