Measurement of CP violation and the B_s^0 meson decay width difference with B_s^0\to J/ψK^+ K^- and B_s^0\to J/ψπ^+π^- decays
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: Amerio, S.
name: Amhis, Y.
name: Anderlini, L.
name: Anderson, J.
name: Andreassen, R.
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: Baesso, C.
name: Balagura, V.
name: Baldini, W.
name: Barlow, R. J.
name: Barschel, C.
name: Barsuk, S.
name: Barter, W.
name: Bauer, Th.
name: Bay, A.
name: Beddow, J.
name: Bedeschi, F.
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: Berezhnoy, A.
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: Blouw, J.
name: Blusk, S.
name: Bocci, V.
name: Bondar, A.
name: Bondar, N.
name: Bonivento, W.
name: Borghi, S.
name: Borgia, A.
name: Bowcock, T. J. V.
name: Bowen, E.
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: Burducea, I.
name: Bursche, A.
name: Busetto, G.
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: Carranza-Mejia, H.
name: Carson, L.
name: Akiba, K. Carvalho
name: Casse, G.
name: Cattaneo, M.
name: Cauet, Ch.
name: Charles, M.
name: Charpentier, Ph.
name: Chen, P.
name: Chiapolini, N.
name: Chrzaszcz, M.
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: Cogneras, E.
name: Collins, P.
name: Comerma-Montells, A.
name: Contu, A.
name: Cook, A.
name: Coombes, M.
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name: Corti, G.
name: Couturier, B.
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name: Craik, D. C.
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name: D'Ambrosio, C.
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name: De Bonis, I.
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name: Egorychev, V.
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name: van Eijk, D.
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name: Elsasser, Ch.
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name: Fontanelli, F.
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name: Francisco, O.
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name: Torreira, A. Gallas
name: Galli, D.
name: Gandelman, M.
name: Gandini, P.
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name: Tico, J. Garra
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name: Gersabeck, E.
name: Gersabeck, M.
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name: Zavertyaev, M.
name: Zhang, F.
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Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: The time-dependent CP asymmetry in B_s^0\to J/ψK^+K^- decays is measured using $pp$ collision data at \sqrt{s}=7TeV, corresponding to an integrated luminosity of 1.0fb^-1, collected with the LHCb detector. The decay time distribution is characterised by the decay widths Γ_L and Γ_H of the light and heavy mass eigenstates of the B_s^0--\bar{B}_s^0 system and by a CP-violating phase ϕ_s. In a sample of 27\,617 B_s^0\to J/ψK^+K^- decays, where the dominant contribution comes from B_s^0\to J/ψϕ decays, these parameters are measured to be ϕ_s = 0.07 \pm 0.09 (stat) \pm 0.01 (syst) rad, Γ_s \equiv (Γ_L+Γ_H)/2 = 0.663 \pm 0.005 (stat) \pm 0.006 (syst) ps^-1, ΔΓ_s \equiv Γ_L -Γ_H = 0.100 \pm 0.016 (stat) \pm 0.003 (syst) &amp; ps^-1, corresponding to the single most precise determination of ϕ_s, ΔΓ_s and Γ_s. The result of performing a combined analysis with B_s^{0} \to J/ψπ^+π^- decays gives ϕ_s = 0.01 \pm 0.07 (stat) \pm 0.01 (syst) rad, Γ_s = 0.661 \pm 0.004 (stat) \pm 0.006 (syst) ps^-1, ΔΓ_s = 0.106 \pm 0.011 (stat) \pm 0.007 (syst) &amp; ps^-1. All measurements are in agreement with the Standard Model predictions.
description: 33 pages, 16 figures