First observation of the decay B[0 over s] → ϕK *[superscript 0]
The first observation of the decay B[0 over s] → ϕK∗[superscript 0] is reported. The analysis is based on a data sample corresponding to an integrated luminosity of 1.0 fb[superscript −1] of pp collisions at √s = 7 TeV, collected with the LHCb detector. A yield of 30 ± 6 B[0 over s] → (K[superscript...
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| Format: | Article |
| Language: | en_US |
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Springer-Verlag
2014
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| Online Access: | http://hdl.handle.net/1721.1/86027 https://orcid.org/0000-0001-8285-3346 |
| Summary: | The first observation of the decay B[0 over s] → ϕK∗[superscript 0] is reported. The analysis is based on a data sample corresponding to an integrated luminosity of 1.0 fb[superscript −1] of pp collisions at √s = 7 TeV, collected with the LHCb detector. A yield of 30 ± 6 B[0 over s] → (K[superscript +]K[superscript −])(K[superscript −]π[superscript +) decays is found in the mass windows 1012.5 < M (K [superscript +] K [superscript −]) < 1026.5 MeV/c [superscript 2] and 746 < M(K [superscript −] π [superscript +]) < 1046 MeV/c [superscript 2]. The signal yield is found to be dominated by B[0 over s] → ϕK∗[superscript 0] decays, and the corresponding branching fraction is measured to be B(B[0 over s] → ϕK∗[superscript 0]) = (1.10 ± 0.24 (stat) ± 0.14 (syst) ± 0.08 (f [subscript d] /f [subscript s] )) × 10[superscript −6], where the uncertainties are statistical, systematic and from the ratio of fragmentation fractions f [subscript d] /f [subscript s] which accounts for the different production rate of B [superscript 0] and B[0 over s] mesons. The significance of B[0 over s] → ϕK∗[superscript 0] signal is 6.1 standard deviations. The fraction of longitudinal polarization in B[0 over s] → ϕK∗[superscript 0] decays is found to be f [subscript 0] = 0.51 ± 0.15 (stat) ± 0.07 (syst). |
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