Observation of the suppressed ADS modes B± →[π±K∓π+π-] D K± and B± →[π±K∓π+π-] Dπ±

Aaij, R; Abellan Beteta, C; Adeva, B; Adinol, M; Adrover, C; Affolder, A; Ajaltouni, Z; Albrecht, J; Alessio, F; Alexander, M; Ali, S; Alkhazov, G; Alvarez Cartelle, P; Alves, A; Amato, S; Amerio, S; Amhis, Y; Anderlini, L; Anderson, J; Andreassen, R; Appleby, R; Aquines, O; Archilli, F; Artamonov, A; Artuso, M; Aslanides, E; Auriemma, G; Bachmann, S; Back, J; Baesso, C; Balagura, V; Baldini, W; Barlow, R; Barschel, C; Barsuk, S; Barter, W; Bauer, T; Bay, A; Beddow, J; Bedeschi, F; Bediaga, I; Belogurov, S; Belous, K; Belyaev, I; Ben Haim, E; Benayoun, M; Bencivenni, G; Benson, S; Benton, J; Berezhnoy, A; Bernet, R; Bettler, M; van Beuzekom, M; Bien, A; Bifani, S; Bird, T; Bizzeti, A; Bjørnstad, P; Blake, T; Blanc, F; Blouw, J; Blusk, S; Bocci, V; Bondar, A; Bondar, N; Bonivento, W; Borghi, S; Borgia, A; Bowcock, T; Bowen, E; Bozzi, C; Brambach, T; Vandenbrand, J; Bressieux, J; Brett, D; Britsch, M; Britton, T; Brook, N; Burducea, I; Bursche, A; Busetto, G; Buytaert, J; Cadeddu, S; Callot, O; 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doi:10.1016/j.physletb.2013.05.009

An analysis of B± → DK± and B± → Dπ± decays is presented where the D meson is reconstructed in the four-body nal state K±π∓π+π-. Using LHCb data corresponding to an integrated luminosity of 1.0 fb-1, rst observations are made of the suppressed ADS modes B± →[π±K∓π+π-] D K± and B± → [π±K∓π+π-]Dπ± with a signicance of 5.1σ and greater than 10σ, respectively. Measurements of CP asymmetries and CP-conserving ratios of partial widths from this family of decays are also performed. The magnitude of the ratio between the suppressed and favoured B± → DK± amplitudes is determined to be rKB = 0.097±0.011. © CERN for the benet of the LHCb Collaboration.

Aaij, R., Abellan Beteta, C., Adeva, B., Adinol, M., Adrover, C., Affolder, A., et al. (2013). Observation of the suppressed ADS modes B± →[π±K∓π+π-] D K± and B± →[π±K∓π+π-] Dπ±. PHYSICS LETTERS. SECTION B, 723(1-3), 44-53 [10.1016/j.physletb.2013.05.009].