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Aaij, R, Beteta, C Abellan, Adeva, B, Adinolfi, M, Aidala, CA, Ajaltouni, Z, Akar, S, Albicocco, P, Albrecht, J, Alessio, F et al (show 835 more authors) , Alexander, M, Albero, A Alfonso, Alkhazov, G, Cartelle, P Alvarez, Jr, Alves AA, Amato, S, Amerio, S, Amhis, Y, An, L, Anderlini, L, Andreassi, G, Andreotti, M, Andrews, JE, Archilli, F, d'Argent, P, Romeu, J Arnau, Artamonov, A, Artuso, M, Arzymatov, K, Aslanides, E, Atzeni, M, Audurier, B, Bachmann, S, Back, JJ, Baker, S, Balagura, V, Baldini, W, Baranov, A, Barlow, RJ, Barrand, GC, Barsuk, S, Barter, W, Bartolini, M, baryshnikov, F, Batozskaya, V, Batsukh, B, Battig, A, Battista, V, Bay, A, Beddow, J, Bedeschi, F, Bediaga, I, Beiter, A, Bel, LJ, Belin, S, Beliy, N, Bellee, V, Belloli, N, Belous, K, Belyaev, I, Ben-Haim, E, Bencivenni, G, Benson, S, Beranek, S, Berezhnoy, A, Bernet, R, Berninghoff, D, Bertholet, E, Bertolin, A, Betancourt, C, Betti, F, Bettler, MO, van Beuzekom, M, Bezshyiko, Ia, Bhasin, S, Bhom, J, Bifani, S, 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(2020)
Measurement of the branching fraction of the decay B-s(0) -> (KSKS0)-K-0.
PHYSICAL REVIEW D, 102 (1).
012011-.
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Abstract
A measurement of the branching fraction of the decay $B_s^0 \to K_S^0 K_S^0$
is performed using proton-proton collision data corresponding to an integrated
luminosity of 5 $fb^{-1}$ collected by the LHCb experiment between 2011 and
2016. The branching fraction is determined to be BR($B_s^0 \to K_S^0 K_S^0$) =
[8.3 $\pm$ 1.6 (stat) $\pm$ 0.9 (syst) $\pm$ 0.8 (norm) $\pm$ 0.3 ($f_s/f_d$)]
$\times 10^{-6}$ , where the first uncertainty is statistical, the second is
systematic, and the third and fourth are due to uncertainties on the branching
fraction of the normalization mode $B^0 \to \phi K_S^0$ and the ratio of
hadronization fractions $f_s/f_d$. This is the most precise measurement of this
branching fraction to date.
Furthermore, a measurement of the branching fraction of the decay $B^0 \to
K_S^0 K_S^0$ is performed relative to that of the $B_s^0 \to K_S^0 K_S^0$
channel, and is found to be $\frac{BR(B^0 \to K_S^0 K_S^0)}{BR(B_s^0 \to K_S^0
K_S^0)}$ = [7.5 $\pm$ 3.1 (stat) $\pm$ 0.5 (syst) $\pm$ 0.3 ($f_s/f_d$)]
$\times 10^{-2}$.