First measurement of the CP-violating phase in $B_s^0 \to \phi \phi$ decays

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Abellan, Beteta C, Adeva, B, Adinolfi, M, Adrover, C, Affolder, A, Ajaltouni, Z, Albrecht, J, Alessio, F, Alexander, M, Ali, S et al (show 120 more authors) , Alkhazov, G, Alvarez, Cartelle P, Alves, Jr AA, Amato, S, Amerio, S, Amhis, Y, Anderlini, L, Anderson, J, Andreassen, R, Appleby, RB, Aquines, Gutierrez O, Archilli, F, Artamonov, A, Artuso, M, Aslanides, E, Auriemma, G, Bachmann, S, Back, JJ, Baesso, C, Balagura, V, Baldini, W, Barlow, RJ, Barschel, C, Barsuk, S, Barter, W, Bauer, Th, 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-O, van, Beuzekom M, Bien, A, Bifani, S, Bird, T, Bizzeti, A, Bjørnstad, PM, Blake, T, Blanc, F, Blouw, J, Blusk, S, Bocci, V, Bondar, A, Bondar, N, Bonivento, W, Borghi, S, Borgia, A, Bowcock, TJV ORCID: 0000-0002-3505-6915, Bowen, E, Bozzi, C, Brambach, T, van, den Brand J, Bressieux, J, Brett, D, Britsch, M, Britton, T, Brook, NH, Brown, H, Burducea, I, Bursche, A, Busetto, G, Buytaert, J, Cadeddu, S, Callot, O, Calvi, M, Calvo, Gomez M, Camboni, A, Campana, P, Campora, Perez D, Carbone, A, Carboni, G, Cardinale, R, Cardini, A, Carranza-Mejia, H, Carson, L, Carvalho, Akiba K, Casse, G ORCID: 0000-0002-8516-237X, Cattaneo, M, Cauet, Ch, Charles, M, Charpentier, Ph, Chen, P, Chiapolini, N, Chrzaszcz, M, Ciba, K, Cid, Vidal X, Ciezarek, G, Clarke, PEL, Clemencic, M, Cliff, HV, Closier, J, Coca, C, Coco, V, Cogan, J, Cogneras, E, Collins, P, Comerma-Montells, A, Contu, A, Cook, A, Coombes, M, Coquereau, S, Corti, G, Couturier, B, Cowan, GA, Craik, D, Cunliffe, S, Currie, R, D'Ambrosio, C, David, P and al, et (2018) First measurement of the CP-violating phase in $B_s^0 \to \phi \phi$ decays. The Journal of High Energy Physics, 2018 (3).

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Abstract

A flavour-tagged time-dependent angular analysis of $B^0_s\to J/\psi\phi$ decays is presented where the $J/\psi$ meson is reconstructed through its decay to an $e^+e^-$ pair. The analysis uses a sample of $pp$ collision data recorded with the LHCb experiment at centre-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb$^{-1}$. The $CP$-violating phase and lifetime parameters of the $B^0_s$ system are measured to be $\phi_s=0.00\pm0.28\pm0.07$ rad, $\Delta\Gamma_s=0.115\pm0.045\pm0.011$ ps$^{-1}$ and $\Gamma_s=0.608\pm0.018\pm0.012$ ps$^{-1}$ where the first uncertainty is statistical and the second systematic. This is the first time that $CP$-violating parameters are measured in the $B^0_s\to J/\psi\phi$ decay with an $e^+e^-$ pair in the final state. The results are consistent with previous measurements in other channels and with the Standard Model predictions.

Item Type:	Article
Additional Information:	## TULIP Type: Articles/Papers (Journal) ##
Uncontrolled Keywords:	CP violation, Flavour Changing Neutral Currents, B physics, Oscillation, Hadron-Hadron scattering (experiments)
Depositing User:	Symplectic Admin
Date Deposited:	23 Apr 2018 07:48
Last Modified:	19 Jan 2023 06:35
DOI:	10.1007/JHEP03(2018)140
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3020506