A key ingredient to searches for physics beyond the Standard Model in B0s mixing phenomena is the measurement of the B0s – B0 s oscillation frequency, which is equivalent to the mass difference 1ms of the B0s mass eigenstates. Using the world’s largest B0s meson sample accumulated in a dataset, corresponding to an integrated luminosity of 1.0 fb−1, collected by the LHCb experiment at the CERN LHC in 2011, a measurement of 1ms is presented. A total of about 34 000B0s !D− s + signal decays are reconstructed, with an average decay time resolution of 44 fs. The oscillation frequency is measured to be 1ms = 17.768± 0.023 (stat) ±0.006 (syst) ps−1, which is the most precise measurement to date.

Precision measurement of the B0s–$\overline{\rm B}{}^0_{\rm s}$ oscillation frequency with the decay B0s→ D−sπ+

AURIEMMA, Giulio;SATRIANO, Celestina;
2013-01-01

Abstract

A key ingredient to searches for physics beyond the Standard Model in B0s mixing phenomena is the measurement of the B0s – B0 s oscillation frequency, which is equivalent to the mass difference 1ms of the B0s mass eigenstates. Using the world’s largest B0s meson sample accumulated in a dataset, corresponding to an integrated luminosity of 1.0 fb−1, collected by the LHCb experiment at the CERN LHC in 2011, a measurement of 1ms is presented. A total of about 34 000B0s !D− s + signal decays are reconstructed, with an average decay time resolution of 44 fs. The oscillation frequency is measured to be 1ms = 17.768± 0.023 (stat) ±0.006 (syst) ps−1, which is the most precise measurement to date.
2013
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11563/55637
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