
TL;DR
This paper reports the first observation of Bs-Bsbar oscillations with high statistical significance, measuring the oscillation frequency and related CKM matrix element ratio using data from the Fermilab Tevatron.
Contribution
The study provides the first definitive measurement of Bs-Bsbar oscillation frequency and related parameters, confirming oscillations with over 5 sigma significance.
Findings
Measured Delta ms = 17.77 ± 0.10 (stat) ± 0.07 (syst) ps^-1
Determined |Vtd/Vts| = 0.2060 ± 0.0007 (exp) + 0.0081 - 0.0060 (theor)
Observed Bs-Bsbar oscillations with high statistical significance
Abstract
We report the observation of Bs-Bsbar oscillations from a time-dependent measurement of the Bs-Bsbar oscillation frequency Delta ms. Using a data sample of 1 fb^-1 of p-pbar collisions at sqrt{s}=1.96 TeV collected with the CDF II detector at the Fermilab Tevatron, we find signals of 5600 fully reconstructed hadronic Bs decays, 3100 partially reconstructed hadronic Bs decays, and 61500 partially reconstructed semileptonic Bs decays. We measure the probability as a function of proper decay time that the Bs decays with the same, or opposite, flavor as the flavor at production, and we find a signal for Bs-Bsbar oscillations. The probability that random fluctuations could produce a comparable signal is 8 X 10^-8, which exceeds 5 sigma significance. We measure Delta ms = 17.77 +- 0.10 (stat) +- 0.07 (syst) ps^-1 and extract |Vtd/Vts| = 0.2060 +- 0.0007 (exp) + 0.0081 - 0.0060 (theor).
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
