Observation of B[superscript 0][subscript s]-[bar over B][superscript 0][subscript s] mixing and measurement of mixing frequencies using semileptonic B decays
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Author(s)
Aaij, R.
Adeva, B.
Adinolfi, M.
Adrover, C.
Affolder, A.
Ajaltouni, Z.
Albrecht, J.
Alessio, F.
Alexander, M.
Ali, S.
Alternative Title
Observation of B0s–¯B0s mixing and measurement of mixing frequencies using semileptonic B decays
Date Issued
December 2013
Journal
The European Physical Journal C
Publisher
Springer Berlin Heidelberg
Citation
The LHCb Collaboration et al. “Observation of B[superscript 0][subscript s]-[bar B][superscrip 0][subscript s] Mixing and Measurement of Mixing Frequencies Using Semileptonic B Decays.” The European Physical Journal C 73.12 (2013): n. pag. © 2013 CERN for the benefit of the LHCb collaboration
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Final published version
Abstract
The B[superscript 0][subscript s] and B[superscript 0] mixing frequencies, Δm[subscript s] and Δm[subscript d], are measured using a data sample corresponding to an integrated luminosity of 1.0 fb[superscript −1] collected by the LHCb experiment in pp collisions at a centre of mass energy of 7 TeV during 2011. Around 1.8×10[superscript 6] candidate events are selected of the type B[superscript 0][subscipt (s)]→D[superscript −][subscript (s)]μ[superscript +] (+ 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 initial-state flavour and so to resolve oscillations due to mixing. We obtain
Δm[subscript s]=(17.93 ± 0.22(stat) ±0.15(syst)) ps[superscript −1], Δm[subscript d]=(0.503 ± 0.011(stat) ±0.013(syst)) ps[superscript −1].The B[superscript 0][subscript s] and B[superscript 0] mixing frequencies, Δms and Δmd, 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+B(s)0→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 initial-state flavour and so to resolve oscillations due to mixing. We obtain
Δms=(17.93±0.22(stat)±0.15(syst)) ps−1,Δmd=(0.503±0.011(stat)±0.013(syst)) ps−1.
Δms=(17.93±0.22(stat)±0.15(syst)) ps−1,Δmd=(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 B[superscript 0][subscript s] and 13.0 standard deviations for B[superscript 0]. This is the first observation of B[superscript 0][subscript s] mixing to be made using only semileptonic decays.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
http://dx.doi.org/10.1140/epjc/s10052-013-2655-8
