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  4. Measurement of CP violation in the B-s(0)-> phi phi decay and search for the B-0 -> phi phi decay
 
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Measurement of CP violation in the B-s(0)-> phi phi decay and search for the B-0 -> phi phi decay

Aaij, R.
•
Beteta, C. Abellan
•
Adeva, B.
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December 23, 2019
Journal of High Energy Physics

A measurement of the time-dependent CP-violating asymmetry in Bs0 ->phi phi = 7 TeV in 2011, 8 TeV in 2012 and 13 TeV in 2015 and 2016, a signal yield of around 9000 Bs0 ->phi phi decays is obtained. The CP-violating phase phi sss over bar is measured to be -0.073 +/- 0.115(stat) +/- 0.027(syst) rad, under the assumption it is independent of the helicity of the phi phi 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 |lambda| = 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 over bar -> s over bar ss over bar transitions. Finally, a limit on the branching fraction of the B-0 -> phi phi decay is determined to be Bmml:mfenced close=")" open=(B0 ->phi phi 2.7x10(-8) at 90% confidence level.

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10-1007-JHEP12_2019_155.pdf

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Publisher's Version

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http://purl.org/coar/version/c_970fb48d4fbd8a85

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openaccess

License Condition

CC BY

Size

752.75 KB

Format

Adobe PDF

Checksum (MD5)

85a58f670632db5d266dee1042a6195c

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