Improved search for B(0)S anti-B(0)S oscillations

Heister, A. and ALEPH Collaboration, The and Bouhova-Thacker, Evelina and Bowdery, Christopher and Finch, Alexander and Foster, Frank and Hughes, Gareth and Jones, Roger (2003) Improved search for B(0)S anti-B(0)S oscillations. The European Physical Journal C (EPJ C) - Particles and Fields, 29 (2). pp. 143-170. ISSN 1434-6052

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Abstract

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.

Item Type:
Journal Article
Journal or Publication Title:
The European Physical Journal C (EPJ C) - Particles and Fields
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3101
Subjects:
?? physics and astronomy (miscellaneous)engineering (miscellaneous) ??
ID Code:
63915
Deposited By:
Deposited On:
02 May 2013 09:46
Refereed?:
Yes
Published?:
Published
Last Modified:
14 Feb 2024 00:45