Sebastian Jaeger 2-Published-25.03.20.pdf (1.37 MB)
Charming New B-Physics
journal contribution
posted on 2023-06-09, 20:57 authored by Sebastian JaegerSebastian Jaeger, Matthew Kirk, Alexander Lenz, Kirsten LeslieKirsten LeslieWe give a comprehensive account of the flavour physics of Beyond-Standard-Model (BSM) effects in b ? cc¯ cs transitions, considering the full set of 20 four-quark operators. We discuss the leading-order structure of their RG mixing with each other as well as the QCD-penguin, dipole, and FCNC semileptonic operators they necessarily mix with, providing compact expressions. We also provide the first complete results for BSM effects in the lifetime observables ?Gs and t (Bs)/t(Bd), as well as for the semileptonic CP-asymmetry asls. From a global analysis, we obtain stringent constraints on 16 of the 20 BSM operators, including the 10 operators Q1…10c' involving a right-handed strange quark. Focussing on CP-conserving new physics, the constraints correspond to NP scales of order 10 TeV in most cases, always dominated by exclusive and/or radiative B-decays via RGE mixing. For the remaining four operators, including the two Standard-Model (SM) ones, larger effects are experimentally allowed, as previously noted in [1]. We extend that paper’s scope to the CP-violating case, paying attention to the impact on the decay rate and time-dependent CP-violation in Bd ? J/?KS. Contrary to common lore, we show that quantifiable constraints arise for new physics in either of the two SM operators, with the uncertain non-perturbative matrix element of the colour-suppressed (or equivalently, colour-octet) operator determined from the data. For new physics in the coefficient C1c, suppressed in the SM, we find (in addition to CP-conserving new physics) two perfectly viable, narrow bands of complex Wilson coefficients. Somewhat curiously, one of them contains a region where the fitted matrix element for the colour-suppressed operator is in agreement with naive factorization, contrarily to a widely held belief that large non- factorizable contributions to Bd ? J/?KS are implied by experimental data.
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Publication status
- Published
File Version
- Published version
Journal
Journal of High Energy PhysicsISSN
1126-6708Publisher
Springer VerlagExternal DOI
Article number
a122Department affiliated with
- Physics and Astronomy Publications
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37 pages, 5 pdf figures, uses jheppub.sty. v2 adds ancillary Mathematica filesFull text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2020-03-26First Open Access (FOA) Date
2020-03-26First Compliant Deposit (FCD) Date
2020-03-25Usage metrics
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