Measurement of $b$-hadron branching fractions for two-body decays into charmless charged hadrons
Creators: name: LHCb Collaboration
name: Aaij, R.
name: Beteta, C. Abellan
name: Adeva, B.
name: Adinolfi, M.
name: Adrover, C.
name: Affolder, A.
name: Ajaltouni, Z.
name: Albrecht, J.
name: Alessio, F.
name: Alexander, M.
name: Ali, S.
name: Alkhazov, G.
name: Cartelle, P. Alvarez
name: Alves, A. A.
name: Amato, S.
name: Amhis, Y.
name: Anderson, J.
name: Appleby, R. B.
name: Gutierrez, O. Aquines
name: Archilli, F.
name: Artamonov, A.
name: Artuso, M.
name: Aslanides, E.
name: Auriemma, G.
name: Bachmann, S.
name: Back, J. J.
name: Balagura, V.
name: Baldini, W.
name: Barlow, R. J.
name: Barschel, C.
name: Barsuk, S.
name: Barter, W.
name: Bates, A.
name: Bauer, C.
name: Bauer, Th.
name: Bay, A.
name: Bediaga, I.
name: Belogurov, S.
name: Belous, K.
name: Belyaev, I.
name: Ben-Haim, E.
name: Benayoun, M.
name: Bencivenni, G.
name: Benson, S.
name: Benton, J.
name: Bernet, R.
name: Bettler, M. -O.
name: van Beuzekom, M.
name: Bien, A.
name: Bifani, S.
name: Bird, T.
name: Bizzeti, A.
name: Bjørnstad, P. M.
name: Blake, T.
name: Blanc, F.
name: Blanks, C.
name: Blouw, J.
name: Blusk, S.
name: Bobrov, A.
name: Bocci, V.
name: Bondar, A.
name: Bondar, N.
name: Bonivento, W.
name: Borghi, S.
name: Borgia, A.
name: Bowcock, T. J. V.
name: Bozzi, C.
name: Brambach, T.
name: Brand, J. van den
name: Bressieux, J.
name: Brett, D.
name: Britsch, M.
name: Britton, T.
name: Brook, N. H.
name: Brown, H.
name: de Bruyn, K.
name: Büchler-Germann, A.
name: Burducea, I.
name: Bursche, A.
name: Buytaert, J.
name: Cadeddu, S.
name: Callot, O.
name: Calvi, M.
name: Gomez, M. Calvo
name: Camboni, A.
name: Campana, P.
name: Carbone, A.
name: Carboni, G.
name: Cardinale, R.
name: Cardini, A.
name: Carson, L.
name: Akiba, K. Carvalho
name: Casse, G.
name: Cattaneo, M.
name: Cauet, Ch.
name: Charles, M.
name: Charpentier, Ph.
name: Chiapolini, N.
name: Ciba, K.
name: Vidal, X. Cid
name: Ciezarek, G.
name: Clarke, P. E. L.
name: Clemencic, M.
name: Cliff, H. V.
name: Closier, J.
name: Coca, C.
name: Coco, V.
name: Cogan, J.
name: Collins, P.
name: Comerma-Montells, A.
name: Contu, A.
name: Cook, A.
name: Coombes, M.
name: Corti, G.
name: Couturier, B.
name: Cowan, G. A.
name: Currie, R.
name: D'Ambrosio, C.
name: David, P.
name: David, P. N. Y.
name: De Bonis, I.
name: De Capua, S.
name: De Cian, M.
name: De Miranda, J. M.
name: De Paula, L.
name: De Simone, P.
name: Decamp, D.
name: Deckenhoff, M.
name: Degaudenzi, H.
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name: Deplano, C.
name: Derkach, D.
name: Deschamps, O.
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name: Dossett, D.
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name: Eidelman, S.
name: van Eijk, D.
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name: Pereira, D. Esperante
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name: van Leerdam, J.
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Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: Based on data corresponding to an integrated luminosity of 0.37 fb^-1 collected by the LHCb experiment in 2011, the following ratios of branching fractions are measured: B(B0 -&gt; pi+ pi-) / B(B0 -&gt; K+pi-) = 0.262 +/- 0.009 +/- 0.017, (fs/fd) * B(Bs -&gt; K+K-) / B(B^0 -&gt; K+pi-) = 0.316 +/- 0.009 +/- 0.019, (fs/fd) * B(Bs -&gt;pi+ K-) / B(B0 -&gt; K+pi-) = 0.074 +/- 0.006 +/- 0.006, (fd/fs) * B(B0 -&gt; K+K-) / B(Bs -&gt; K+K-) = 0.018 {+ 0.008 - 0.007} +/- 0.009, (fs/fd) * B(Bs -&gt; pi+pi-) / B(B0 -&gt; pi+pi-) = 0.050 {+ 0.011 - 0.009} +/- 0.004, B(Lambda_b -&gt; p pi-) / B(Lambda_b -&gt; p K-) = 0.86 +/- 0.08 +/- 0.05, where the first uncertainties are statistical and the second systematic. Using the current world average of B(B0 -&gt; K+pi-) and the ratio of the strange to light neutral B meson production fs/fd measured by LHCb, we obtain: B(B0 -&gt; pi+pi-) = (5.08 +/- 0.17 +/- 0.37) x 10^-6, B(Bs -&gt; K+K-) = (23.0 +/- 0.7 +/- 2.3) x 10^-6, B(Bs -&gt; pi+K-) = (5.4 +/- 0.4 +/- 0.6) x 10^-6, B(B0 -&gt; K+K-) = (0.11 {+ 0.05 - 0.04} +/- 0.06) x 10^-6, B(Bs -&gt; pi+pi-) = (0.95 {+ 0.21 - 0.17} +/- 0.13) x 10^-6. The measurements of B(Bs -&gt; K+K-), B(Bs -&gt; pi+ K-) and B(B0 -&gt; K+K-) are the most precise to date. The decay mode Bs -&gt; pi+pi- is observed for the first time with a significance of more than 5 sigma.
description: 15 pages, 5 figures, 7 tables; v2 with minor changes after journal review