Journal
EUROPEAN PHYSICAL JOURNAL C
Volume 81, Issue 12, Pages -Publisher
SPRINGER
DOI: 10.1140/epjc/s10052-021-09840-z
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Funding
- Polish National Agency forAcademic Exchange under the Bekker program
- Foundation for Polish Science (FNP)
- Australian Research Council [DP180102209, FT190100814]
- PL-Grid Infrastructure
- Australian Research Council [FT190100814] Funding Source: Australian Research Council
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The study explores flavour-changing neutral current effects in B-meson decays as a probe of physics beyond the Standard Model, using a global fit of Wilson coefficients and finding a significant deviation from the SM value, primarily attributed to vector coupling of muons to b and s quarks.
The search for flavour-changing neutral current effects in B-meson decays is a powerful probe of physics beyond the Standard Model. Deviations from SM behaviour are often quantified by extracting the preferred values of the Wilson coefficients of an operator product expansion. We use the FlavBit module of the GAMBIT package to perform a simultaneous global fit of the Wilson coefficients C-7, C-9, and C-10 using a combination of all current data on b -> s mu(+)mu(- )transitions. We further extend previous analyses by accounting for the correlated theoretical uncertainties at each point in the Wilson coefficient parameter space, rather than deriving the uncertainties from a Standard Model calculation. We find that the best fit deviates from the SM value with a significance of 6.6 sigma. The largest deviation is associated with a vector coupling of muons to b and s quarks.
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