Round table: Flavour anomalies inb→sl+l−processes

Blake, T.; Gersabeck, M.; Hofer, Lars; Jäger, Sebastian; Li, Zhaofeng; Zwicky, Roman

doi:10.1051/epjconf/201713701001

Cited by 9 publications

(12 citation statements)

References 99 publications

(138 reference statements)

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“…Notice that for simplicity we wrote the Wilson coefficient C9 omitting higher-order αs-corrections [26]. Neglecting SM electromagnetic dipole contributions (encoded in the coefficients C ( ) 7 ), and non-factorizable corrections, eq.…”

Section: Anatomy Of R K *mentioning

confidence: 99%

Flavour anomalies after the R K ∗ measurement

D’Amico

Nardecchia

Panci

et al. 2017

J. High Energ. Phys.

256

201

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The LHCb measurement of the µ/e ratio R K * indicates a deficit with respect to the Standard Model prediction, supporting earlier hints of lepton universality violation observed in the R K ratio. We show that the R K and R K * ratios alone constrain the chiralities of the states contributing to these anomalies, and we find deviations from the Standard Model at the 4σ level. This conclusion is further corroborated by hints from the theoretically challenging b → sµ + µ − distributions. Theoretical interpretations in terms of Z , lepto-quarks, loop mediators, and composite dynamics are discussed. We highlight their distinctive features in terms of the chirality and flavour structures relevant to the observed anomalies.

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Section: Anatomy Of R K *mentioning

confidence: 99%

Flavour anomalies after the R K ∗ measurement

D’Amico

Nardecchia

Panci

et al. 2017

J. High Energ. Phys.

256

201

View full text Add to dashboard Cite

show abstract

“…Such corrections are for example relevant in the high-statistics B → K * µµ channel [51] where they might explain the P 5 angular anomaly [51] and are of importance for the search of right-handed currents e.g. [50].…”

Section: Jhep11(2017)184mentioning

confidence: 99%

B0 s → ℓ+ℓ−γ as a test of lepton flavor universality

Guadagnoli

Reboud

Zwicky

2017

J. High Energ. Phys.

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We discuss a number of strategies to reduce the ℬ(B s 0 → ℓ + ℓ − γ) theoretical error, and make such a measurement a new probe of the interactions that are interesting in the light of present-day flavor discrepancies. In particular, for low di-lepton invariant mass we propose to exploit the close parenthood between ℬ(B s 0 → ℓ + ℓ − γ) and the measured ℬ(B s 0 → ϕ(→K+K−)γ). For high q 2, conversely, we exploit the fact that the decay is dominated by two form-factor combinations, plus contributions from broad charmonium that we model accordingly. We construct the ratio R γ , akin to R K and likewise sensitive to lepton-universality violation. Provided the two rates in this ratio are integrated in a suitable region that minimises bremsstrahlung contributions while maximising statistics, the ratio is very close to unity and the form-factor dependence cancels to an extent that makes it a new valuable probe of lepton-universality violating contributions in the effective Hamiltonian. We finally speculate on additional ideas to extract short-distance information from resonance regions, which are theoretically interesting but statistically limited at present.

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“…Recently, several discrepancies with the standard model (SM) have been revealed in b → s + − induced decays, e.g., [1]. However, those that do not involve lepton flavor universality violation are not definitely settled due to poorly controlled non-perturbative effects of quantum chromodynamics (QCD).…”

Section: Introductionmentioning

confidence: 99%

“…where γ (1) is the next-to leading order (NLO) ADM, and the mixing via the evanescent operators is found aŝ…”

mentioning

confidence: 99%

Two loop virtual corrections to $$b\rightarrow (d,s)\ell ^+\ell ^-$$ b → ( d , s )

Boer

2017

Eur. Phys. J. C

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Non-factorizable two loop corrections to heavy to light flavor changing neutral current transitions due to matrix elements of current-current operators are calculated analytically for arbitrary momentum transfer. This extends previous work on b → (d, s) + − transitions. New results for c → u + − transitions are presented. Recent work on polylogarithms is used for the master integrals. For b → s + − transitions, the corrections are most significant for the imaginary parts of the effective Wilson coefficients in the large hadronic recoil range. Analytical results and ready-to-use fitted results for a specific set of parameters are provided.

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Round table: Flavour anomalies inb→sl⁺l⁻processes

Cited by 9 publications

References 99 publications

Flavour anomalies after the R K ∗ measurement

Flavour anomalies after the R K ∗ measurement

B0 s → ℓ+ℓ−γ as a test of lepton flavor universality

Two loop virtual corrections to $$b\rightarrow (d,s)\ell ^+\ell ^-$$ b → ( d , s )

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