First measurement of the CP -violating phase in Bs0→J/ψ(→ e+e-) ϕ decays

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Aaij, R, Abellán Beteta, C, Ackernley, T, Adeva, B, Adinolfi, M, Afsharnia, H, Aidala, CA, Aiola, S, Ajaltouni, Z, Akar, S et al (show 90 more authors) , Albrecht, J, Alessio, F, Alexander, M, Alfonso Albero, A, Aliouche, Z, Alkhazov, G, Alvarez Cartelle, P, Amato, S, Amhis, Y, An, L, Anderlini, L, Andreianov, A, Andreotti, M, Archilli, F, Artamonov, A, Artuso, M, Arzymatov, K, Aslanides, E, Atzeni, M, Audurier, B, Bachmann, S, Bachmayer, M, Back, JJ, Baker, S, Baladron Rodriguez, P, Balagura, V, Baldini, W, Baptista Leite, J, Barlow, RJ, Barsuk, S, Barter, W, Bartolini, M, Baryshnikov, F, Basels, JM, Bassi, G, Batozskaya, V ORCID: 0000-0003-1089-9200, Batsukh, B, Battig, A, Bay, A, Becker, M, Bedeschi, F, Bediaga, I, Beiter, A, Belavin, V, Belin, S, Bellee, V, Belous, K, Belov, I, Belyaev, I, Bencivenni, G, Ben-Haim, E, Berezhnoy, A, Bernet, R, Berninghoff, D, Bernstein, HC, Bertella, C, Bertholet, E, Bertolin, A, Betancourt, C, Betti, F, Bettler, MO, Bezshyiko, I, Bhasin, S, Bhom, J, Bian, L, Bieker, MS, Bifani, S, Billoir, P, Birch, M, Bishop, FCR, Bizzeti, A, Bjørn, M, Blago, MP, Blake, T, Blanc, F, Blusk, S, Bobulska, D, Boelhauve, JA, Boente Garcia, O, Boettcher, T, Boldyrev, A, Bondar, A, Bondar, N, Borghi, S, Borisyak, M, Borsato, M, Borsuk, JT, Bouchiba, SA, Bowcock, TJV ORCID: 0000-0002-3505-6915 and Boyer, A (2021) First measurement of the CP -violating phase in Bs0→J/ψ(→ e+e-) ϕ decays European Physical Journal C, 81 (11). 1026-. ISSN 1434-6044, 1434-6052

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Abstract

A flavour-tagged time-dependent angular analysis of Bs0→J/ψϕ decays is presented where the J/ ψ 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 \,Te V , corresponding to an integrated luminosity of 3 \,fb ^{- 1}. The CP-violating phase and lifetime parameters of the Bs0 system are measured to be ϕ<inf>s</inf>= 0.00 ± 0.28 ± 0.07 \,rad , Δ Γ <inf>s</inf>= 0.115 ± 0.045 ± 0.011 \,ps ^{- 1} and Γ <inf>s</inf>= 0.608 ± 0.018 ± 0.012 \,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 Bs0→J/ψϕ 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
Uncontrolled Keywords:	5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 51 Physical Sciences
Divisions:	Faculty of Science & Engineering > School of Physical Sciences
Depositing User:	Symplectic Admin
Date Deposited:	12 Jan 2022 16:25
Last Modified:	22 Jan 2026 07:33
DOI:	10.1140/epjc/s10052-021-09711-7
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3146227
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