Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Study of $B^0_s$ oscillations and lifetime using fully reconstructed $D_s$ - decays
AU - ALEPH Collaboration, The
AU - Barate, R.
AU - Betteridge, Andrew
AU - Bowdery, Christopher
AU - Colrain, Paul
AU - Finch, Alexander
AU - Foster, Frank
AU - Hughes, Gareth
AU - Jones, Roger
AU - Williams, Mark
PY - 1998/7
Y1 - 1998/7
N2 - A search for B0s oscillations is performed using approximately 4 million Z→qq¯ events collected by the ALEPH experiment during 1991–1995. B0s candidates are partially reconstructed by combining tracks with fully reconstructed D−s candidates. The B0s production flavour is estimated from the sign of the opposite hemisphere charge, a fragmentation kaon in the same hemisphere, or a lepton in the opposite hemisphere. From a total sample of 1620 candidates, with a B0s purity estimated to be 22%, all values of Δms below 3.9 ps −1 and between 6.5 and 8.8 ps −1 are excluded at 95% CL. From the same sample, the B0s lifetime is measured to be τs=1.47±0.14(stat)±0.08(syst) ps. This analysis selects mainly hadronic B0s decays and is statistically independent of a previous ALEPH analysis selecting B0s→D(∗)−sℓ+ν candidates. Combining these two analyses yields Δms>7.9 ps −1 at 95% CL and τs=1.51±0.11 ps.
AB - A search for B0s oscillations is performed using approximately 4 million Z→qq¯ events collected by the ALEPH experiment during 1991–1995. B0s candidates are partially reconstructed by combining tracks with fully reconstructed D−s candidates. The B0s production flavour is estimated from the sign of the opposite hemisphere charge, a fragmentation kaon in the same hemisphere, or a lepton in the opposite hemisphere. From a total sample of 1620 candidates, with a B0s purity estimated to be 22%, all values of Δms below 3.9 ps −1 and between 6.5 and 8.8 ps −1 are excluded at 95% CL. From the same sample, the B0s lifetime is measured to be τs=1.47±0.14(stat)±0.08(syst) ps. This analysis selects mainly hadronic B0s decays and is statistically independent of a previous ALEPH analysis selecting B0s→D(∗)−sℓ+ν candidates. Combining these two analyses yields Δms>7.9 ps −1 at 95% CL and τs=1.51±0.11 ps.
U2 - 10.1007/s100520050215
DO - 10.1007/s100520050215
M3 - Journal article
VL - 4
SP - 367
EP - 385
JO - The European Physical Journal C (EPJ C) - Particles and Fields
JF - The European Physical Journal C (EPJ C) - Particles and Fields
SN - 1434-6052
IS - 3
ER -