Branching fraction and CP asymmetry of the decays B<sup>+</sup>→K<inf>S</inf><sup>0</sup>π<sup>+</sup> and B<sup>+</sup>→K<inf>S</inf><sup>0</sup>K<sup>+</sup>

R. Aaij, 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. Andreassen, J. E. AndrewsR. B. Appleby, O. Aquines Gutierrez, F. Archilli, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, 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, 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. Bjørnstad, 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, G. Carboni, R. Cardinale, A. Cardini, H. Carranza-Mejia, L. Carson, K. Carvalho Akiba

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Abstract

An analysis of B<sup>+</sup>→K<inf>S</inf><sup>0</sup>π<sup>+</sup> and B<sup>+</sup>→K<inf>S</inf><sup>0</sup>K<sup>+</sup> decays is performed with the LHCb experiment. The pp collision data used correspond to integrated luminosities of 1fb<sup>-1</sup> and 2fb<sup>-1</sup> collected at centre-of-mass energies of √s=7TeV and √s=8TeV, respectively. The ratio of branching fractions and the direct CP asymmetries are measured to be B(B<sup>+</sup>→K<inf>S</inf>0K<sup>+</sup>)/B(B<sup>+</sup>→K<inf>S</inf><sup>0</sup>π<sup>+</sup>)=0.064±0.009 (stat.)±0.004(syst.), A<sup>CP</sup>(B<sup>+</sup>→K<inf>S</inf><sup>0</sup>π<sup>+</sup>)=-0.022±0.025(stat.)±0.010 (syst.) and A<sup>CP</sup>(B<sup>+</sup>→K<inf>S</inf><sup>0</sup>K<sup>+</sup>)=-0.21±0.14 (stat.)±0.01 (syst.). The data sample taken at √s=7 TeV is used to search for B<inf>c</inf><sup>+</sup>→K<inf>S</inf><sup>0</sup>K<sup>+</sup> decays and results in the upper limit (f<inf>c</inf>{dot operator}B(B<inf>c</inf><sup>+</sup>→K<inf>S</inf><sup>0</sup>K<sup>+</sup>))/(fu{dot operator}B(B<sup>+</sup>→K<inf>S</inf><sup>0</sup>π<sup>+</sup>))<5.8×10-2 at 90% confidence level, where f<inf>c</inf> and f<inf>u</inf> denote the hadronisation fractions of a b- quark into a Bc+ or a B<sup>+</sup> meson, respectively. © 2013 CERN.
Original languageEnglish
Pages (from-to)646-655
Number of pages10
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
DOIs
Publication statusPublished - 1 Jan 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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    Aaij, R., Adeva, B., Adinolfi, M., Adrover, C., Affolder, A., Ajaltouni, Z., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A. A., Amato, S., Amerio, S., Amhis, Y., Anderlini, L., Anderson, J., Andreassen, R., ... Carvalho Akiba, K. (2013). Branching fraction and CP asymmetry of the decays B<sup>+</sup>→K<inf>S</inf><sup>0</sup>π<sup>+</sup> and B<sup>+</sup>→K<inf>S</inf><sup>0</sup>K<sup>+</sup> Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 646-655. https://doi.org/10.1016/j.physletb.2013.09.046