TY - JOUR
T1 - Measurement of CP violation in the Bs0→ϕϕ decay and search for the B 0 → ϕϕ decay
AU - The LHCb Collaboration
AU - Aaij, R.
AU - Abellán Beteta, C.
AU - Adeva, B.
AU - Adinolfi, M.
AU - Aidala, C. A.
AU - Ajaltouni, Z.
AU - Akar, S.
AU - Albicocco, P.
AU - Albrecht, J.
AU - Alessio, F.
AU - Alexander, M.
AU - Alfonso Albero, A.
AU - Alkhazov, G.
AU - Alvarez Cartelle, P.
AU - Alves, A. A.
AU - Amato, S.
AU - Amhis, Y.
AU - An, L.
AU - Anderlini, L.
AU - Andreassi, G.
AU - Andreotti, M.
AU - Andrews, J. E.
AU - Archilli, F.
AU - Arnau Romeu, J.
AU - Artamonov, A.
AU - Artuso, M.
AU - Arzymatov, K.
AU - Aslanides, E.
AU - Atzeni, M.
AU - Audurier, B.
AU - Bachmann, S.
AU - Back, J. J.
AU - Baker, S.
AU - Balagura, V.
AU - Baldini, W.
AU - Baranov, A.
AU - Barlow, R. J.
AU - Barsuk, S.
AU - Barter, W.
AU - Bartolini, M.
AU - Baryshnikov, F.
AU - Batozskaya, V.
AU - Batsukh, B.
AU - Battig, A.
AU - Battista, V.
AU - Bay, A.
AU - Bedeschi, F.
AU - Petrov, A.
AU - Strokov, S.
AU - Vagner, A.
PY - 2019/12/1
Y1 - 2019/12/1
N2 - A measurement of the time-dependent CP-violating asymmetry in Bs0→ϕϕ decays is presented. Using a sample of proton-proton collision data corresponding to an integrated luminosity of 5.0 fb−1 collected by the LHCb experiment at centre-of-mass energies s = 7 TeV in 2011, 8 TeV in 2012 and 13 TeV in 2015 and 2016, a signal yield of around 9000 Bs0→ϕϕ decays is obtained. The CP-violating phase ϕsss¯s is measured to be −0.073 ± 0.115(stat) ± 0.027(syst) rad, under the assumption it is independent of the helicity of the ϕϕ decay. In addition, the CP-violating phases of the transverse polarisations under the assumption of CP conservation of the longitudinal phase are measured. The helicity-independent direct CP-violation parameter is also measured, and is found to be |λ| = 0.99 ± 0.05(stat) ± 0.01(syst). In addition, T-odd triple-product asymmetries are measured. The results obtained are consistent with the hypothesis of CP conservation in b¯ → s¯ ss¯ s transitions. Finally, a limit on the branching fraction of the B0 → ϕϕ decay is determined to be B(B→ ϕϕ) < 2.7 × 10 − 8 at 90 % confidence level. [Figure not available: see fulltext.].
AB - A measurement of the time-dependent CP-violating asymmetry in Bs0→ϕϕ decays is presented. Using a sample of proton-proton collision data corresponding to an integrated luminosity of 5.0 fb−1 collected by the LHCb experiment at centre-of-mass energies s = 7 TeV in 2011, 8 TeV in 2012 and 13 TeV in 2015 and 2016, a signal yield of around 9000 Bs0→ϕϕ decays is obtained. The CP-violating phase ϕsss¯s is measured to be −0.073 ± 0.115(stat) ± 0.027(syst) rad, under the assumption it is independent of the helicity of the ϕϕ decay. In addition, the CP-violating phases of the transverse polarisations under the assumption of CP conservation of the longitudinal phase are measured. The helicity-independent direct CP-violation parameter is also measured, and is found to be |λ| = 0.99 ± 0.05(stat) ± 0.01(syst). In addition, T-odd triple-product asymmetries are measured. The results obtained are consistent with the hypothesis of CP conservation in b¯ → s¯ ss¯ s transitions. Finally, a limit on the branching fraction of the B0 → ϕϕ decay is determined to be B(B→ ϕϕ) < 2.7 × 10 − 8 at 90 % confidence level. [Figure not available: see fulltext.].
KW - Hadron-Hadron scattering (experiments)
UR - http://www.scopus.com/inward/record.url?scp=85077196849&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85077196849&partnerID=8YFLogxK
U2 - 10.1007/JHEP12(2019)155
DO - 10.1007/JHEP12(2019)155
M3 - Article
AN - SCOPUS:85077196849
VL - 2019
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
SN - 1126-6708
IS - 12
M1 - 155
ER -