Precision measurement of the B<inf>s</inf>-<sup>0</sup> B<inf>s</inf><sup>0</sup> oscillation frequency with the decay B<inf>s</inf>- <sup>0</sup>→ D<inf>sπ</inf><sup>-+</sup>

R. Aaij, C. Abellan Beteta, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves, S. Amato, S. Amerio, Y. Amhis, L. Anderlini, J. Anderson, R. AndreassenR. B. Appleby, O. Aquines Gutierrez, F. Archilli, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, S. Bachmann, J. J. Back, C. Baesso, V. Balagura, W. Baldini, R. J. Barlow, C. Barschel, S. Barsuk, W. Barter, Th Bauer, A. Bay, J. Beddow, F. Bedeschi, I. Bediaga, S. Belogurov, K. Belous, I. Belyaev, E. Ben-Haim, M. Benayoun, G. Bencivenni, S. Benson, J. Benton, A. Berezhnoy, R. Bernet, M. O. Bettler, M. Van Beuzekom, A. Bien, S. Bifani, T. Bird, A. Bizzeti, P. M. Bjornstad, T. Blake, F. Blanc, J. Blouw, S. Blusk, V. Bocci, A. Bondar, N. Bondar, W. Bonivento, S. Borghi, A. Borgia, T. J.V. Bowcock, E. Bowen, C. Bozzi, T. Brambach, J. Van Den Brand, J. Bressieux, D. Brett, M. Britsch, T. Britton, N. H. Brook, H. Brown, I. Burducea, A. Bursche, G. Busetto, J. Buytaert, S. Cadeddu, O. Callot, M. Calvi, M. Calvo Gomez, A. Camboni, P. Campana, D. Campora Perez, A. Carbone

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Abstract

A key ingredient to searches for physics beyond the Standard Model in B s- 0 mixing phenomena is the measurement of the B s- 0 oscillation frequency, which is equivalent to the mass difference Δm s of the B s- 0 mass eigenstates. Using the world's largest B s- 0 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 Δm s is presented. A total of about 34 000 B s- 0 → D -+ signal decays are reconstructed, with an average decay time resolution of 44 fs. The oscillation frequency is measured to be Δm s = 17.768 ± 0.023 (stat) ± 0.006 (syst) ps -1, which is the most precise measurement to date.

Original languageEnglish
Article number053021
JournalNew Journal of Physics
Volume15
DOIs
Publication statusPublished - 1 May 2013
Externally publishedYes

Bibliographical note

Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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