Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Improved search for B(0)S anti-B(0)S oscillations
AU - Heister, A.
AU - ALEPH Collaboration, The
AU - Bouhova-Thacker, Evelina
AU - Bowdery, Christopher
AU - Finch, Alexander
AU - Foster, Frank
AU - Hughes, Gareth
AU - Jones, Roger
PY - 2003/7
Y1 - 2003/7
N2 - An improved search for B s 0 oscillations is performed in the ALEPH data sample collected during the first phase of LEP, and reprocessed in 1998. Three analyses based on complementary event selections are presented. First, decays of B s 0 mesons into hadronic flavour eigenstates are fully reconstructed. This selection yields a small sample of candidates with excellent decay length and momentum resolution and hi gh average B s 0 purity. Semileptonic decays with a reconstructed D s - meson provide a second sample with larger statistics, high average B s 0 purity, but a poorer momentum and decay length resolution due to the partial decay reconstruction. Finally, semileptonic b-hadron decays are inclusively selected and yield the data sample with the highest sensitivity to B s 0 oscillations, as the much higher statistics compensate for the low average B s 0 purity and poorer time resolution. A lower limit is set at Δms>10.9 ps-1 at 95% C.L., significantly lower than the expected limit of 15.2 ps-1.
AB - An improved search for B s 0 oscillations is performed in the ALEPH data sample collected during the first phase of LEP, and reprocessed in 1998. Three analyses based on complementary event selections are presented. First, decays of B s 0 mesons into hadronic flavour eigenstates are fully reconstructed. This selection yields a small sample of candidates with excellent decay length and momentum resolution and hi gh average B s 0 purity. Semileptonic decays with a reconstructed D s - meson provide a second sample with larger statistics, high average B s 0 purity, but a poorer momentum and decay length resolution due to the partial decay reconstruction. Finally, semileptonic b-hadron decays are inclusively selected and yield the data sample with the highest sensitivity to B s 0 oscillations, as the much higher statistics compensate for the low average B s 0 purity and poorer time resolution. A lower limit is set at Δms>10.9 ps-1 at 95% C.L., significantly lower than the expected limit of 15.2 ps-1.
U2 - 10.1140/epjc/s2003-01230-5
DO - 10.1140/epjc/s2003-01230-5
M3 - Journal article
VL - 29
SP - 143
EP - 170
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 - 2
ER -