Measurement of CP asymmetries and polarisation fractions in B<inf>s</inf><sup>0</sup>→K<sup>∗0</sup>K<sup>¯∗0</sup> decays

The LHCb collaboration, R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves, S. Amato, S. Amerio, Y. Amhis, L. An, L. Anderlini, J. AndersonR. Andreassen, M. Andreotti, J. E. Andrews, R. B. Appleby, O. Aquines Gutierrez, F. Archilli, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, S. Bachmann, J. J. Back, A. Badalov, C. Baesso, W. Baldini, R. J. Barlow, C. Barschel, S. Barsuk, W. Barter, V. Batozskaya, V. Battista, A. Bay, L. Beaucourt, J. Beddow, F. Bedeschi, I. Bediaga, L. J. Bel, S. Belogurov, I. Belyaev, E. Ben-Haim, G. Bencivenni, S. Benson, J. Benton, A. Berezhnoy, R. Bernet, A. Bertolin, M. O. Bettler, M. van Beuzekom, A. Bien, S. Bifani, T. Bird, A. Bizzeti, T. Blake, F. Blanc, J. Blouw, S. Blusk, V. Bocci, A. Bondar, N. Bondar, W. Bonivento, S. Borghi, A. Borgia, M. Borsato, T. J.V. Bowcock, E. Bowen, C. Bozzi, D. Brett, M. Britsch, T. Britton, J. Brodzicka, N. H. Brook, A. Bursche, J. Buytaert, S. Cadeddu, R. Calabrese, M. Calvi, M. Calvo Gomez, P. Campana, D. Campora Perez, L. Capriotti

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Abstract

© 2015, The Author(s). Abstract: An angular analysis of the decay B<inf>s</inf><sup>0</sup>→K<sup>∗0</sup>K<sup>¯∗0</sup> is performed using pp collisions corresponding to an integrated luminosity of 1.0 fb<sup>−1</sup> collected by the LHCb experiment at a centre-of-mass energy √s=7 TeV. A combined angular and mass analysis separates six helicity amplitudes and allows the measurement of the longitudinal polarisation fraction f<inf>L</inf> = 0.201 ± 0.057 (stat.) ± 0.040 (syst.) for the (Formula Presented) decay. A large scalar contribution from the K<inf>0</inf><sup>∗</sup>(1430) and K<inf>0</inf><sup>∗</sup>(800) resonances is found, allowing the determination of additional CP asymmetries. Triple product and direct CP asymmetries are determined to be compatible with the Standard Model expectations. The branching fraction ℬBs→<sup>K∗</sup><sup>8920</sup><sup>K¯∗</sup><sup>8920</sup> is measured to be (10.8 ± 2.1 (stat.) ± 1.4 (syst.) ± 0.6 (f<inf>d</inf>/f<inf>s</inf>)) × 10<sup>−6</sup>.
Original languageEnglish
JournalJournal of High Energy Physics
DOIs
Publication statusPublished - 6 Jul 2015
Externally publishedYes

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