First measurement of the CP-violating phase ϕsdd¯ in Bs 0 → (K + π )(K π +) decays

R. Aaij, B. Adeva, M. Adinolfi, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, M. Alexander, A. Alfonso Albero, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves, S. Amato, S. Amerio, Y. Amhis, L. An, L. Anderlini, G. Andreassi, M. AndreottiJ. E. Andrews, R. B. Appleby, F. Archilli, P. d’Argent, J. Arnau Romeu, A. Artamonov, M. Artuso, E. Aslanides, M. Atzeni, G. Auriemma, M. Baalouch, I. Babuschkin, S. Bachmann, J. J. Back, A. Badalov, C. Baesso, S. Baker, V. Balagura, W. Baldini, S. Bifani, R. Calladine, G. Chatzikonstantinidis, N. Farley, P. Ilten, C. Lazzeroni, A. Mazurov, A. Sergi, N. K. Watson, T. Williams, K. A. Zarebski, LHCb Collaboration

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Abstract

A flavour-tagged decay-time-dependent amplitude analysis of Bs 0 → (K+π)(Kπ+) decays is presented in the K±π mass range from 750 to 1600MeV/c2. The analysis uses pp collision data collected with the LHCb detector at centre-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3.0 fb−1. Several quasi-two-body decay modes are considered, corresponding to K±π combinations with spin 0, 1 and 2, which are dominated by the K0 *(800)0 and K0 *(1430)0, the K*(892)0 and the K2 *(1430)0 resonances, respectively. The longitudinal polarisation fraction for the Bs0→K∗(892)°K¯∗(892)0 decay is measured as fL = 0.208 ± 0.032 ± 0.046, where the first uncertainty is statistical and the second is systematic. The first measurement of the mixing-induced CP-violating phase, ϕsdd¯, in b→ dd¯ s transitions is performed, yielding a value of ϕsdd¯=−0.10±0.13(stat)±0.14 (syst) rad.

Original languageEnglish
Article number140
JournalJournal of High Energy Physics
Volume2018
Issue number3
DOIs
Publication statusPublished - 23 Mar 2018

Keywords

  • B physics
  • CP violation
  • Flavour Changing Neutral Currents
  • Hadron-Hadron scattering (experiments)
  • Oscillation

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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