Loop effects of heavy new scalars and fermions in b → sμ + μ −

Arnan, Pere; Crivellin, Andreas; Hofer, Lars; Mescia, Federico

doi:10.1007/jhep04(2017)043

Cited by 127 publications

(193 citation statements)

References 97 publications

(154 reference statements)

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“…Refs. [91][92][93][94] have explored renormalizable models that explain R K at the one-loop level, while the MSSM with R-parity conservation was considered in Ref. [95].…”

Section: Introductionmentioning

confidence: 99%

Gauge-invariant implications of the LHCb measurements on lepton-flavor nonuniversality

et al. 2017

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We study the implications of the recent measurements of RK and RK * by the LHCb collaboration. We do that by adopting a model-independent approach based on the Standard Model Effective Field Theory (SMEFT), in which the dominant new physics effects are encoded in the coefficients of dimension-six operators respecting the full Standard Model (SM) gauge symmetry. After providing simplified expressions for RK and RK * , we determine the implications of the recent LHCb results for these observables on the coefficients of the SMEFT operators at low and high energies. We also take into account all b → s data, which combined lead to effective New Physics (NP) scenarios with SM pulls in excess of 5 σ. Thus the operators discussed in this paper would be the first dimension-six terms in the SM Lagrangian to be detected experimentally. Indirect constraints on these operators are also discussed. The results of this paper transcend the singularity of the present situation, and set a standard for future analyses in b → s transitions when the NP is assumed to lie above the electroweak scale.

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“…Refs. [91][92][93][94] have explored renormalizable models that explain R K at the one-loop level, while the MSSM with R-parity conservation was considered in Ref. [95].…”

Section: Introductionmentioning

confidence: 99%

Gauge-invariant implications of the LHCb measurements on lepton-flavor nonuniversality

et al. 2017

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“…It was shown in Ref. [93] that this bound can be relaxed in a scenario with Majorana fermions in the box where the additional crossed boxes lead to a negative interference in B s − B s mixing.…”

Section: Constraints From B S − B S Mixing and Direct Searchesmentioning

confidence: 99%

“…At one loop, they can be generated by box diagrams involving new particles (e.g. [91][92][93]) or by Z � penguins (e.g. [94]).…”

Section: Bsm Interpretation (L Hofer)mentioning

confidence: 99%

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

et al. 2017

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Abstract. Precision measurements of flavour observables can provide powerful tests of many extensions of the Standard Model. This contribution covers a range of flavour measurements of b → s� + � − transitions, several of which are in tension with the Standard Model of particle physics, as well as their theoretical interpretation. The basics of the theoretical background are discussed before turning to the main question of the field: whether the anomalies can be explained by QCD effects or whether they may be indicators of effects beyond the Standard Model.

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“…New box contributions [112,113] and Z penguins [114] have been discussed in the literature. A Z model with a loop-induced coupling to muons has been investigated in [115].…”

Section: Pos(fpcp2017)042mentioning

confidence: 99%

Quo vadis flavour physics? FPCP2017 Theory Summary and Outlook

Blanke¹

2017

Proceedings of the 15th International Conference on Flavor Physics &Amp; CP Violation — PoS(FPCP2017)

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We review the recent highlights of theoretical flavour physics, based on the theory summary talk given at FPCP2017. Over the past years, a number of intriguing anomalies have emerged in flavour violating K and B meson decays, constituting some of the most promising hints for the presence of physics beyond the Standard Model. We discuss the theory status of these anomalies and outline possible future directions to test the underlying New Physics. PoS(FPCP2017)042Quo vadis flavour physics? Monika Blanke New Physics sensitivity of flavour physicsDespite the impressive amount of data collected and analysed during run 1 and early run 2 of the LHC, until now no clear signal of new particles has been found in the direct searches for New Physics (NP). While we might have simply been unlucky in the choice of NP discovery modes, it is also conceivable that the NP scale is larger than the energies directly accessible at the LHC. Together with the continuing efforts at the high-p T frontier, it is therefore of utmost importance to explore alternative routes to access the nature of NP.Precision tests of Standard Model (SM) observables provide complementary access to NP contributions. As in such low energy processes new particles contribute via quantum effects, they are not plagued by the same strict energy cut-off as the LHC. The sensitivity in this case is limited by the cleanliness of the theoretical predictions in the SM, in addition to the obtained experimental precision. Particularly useful in this context are observables whose SM contribution is suppressed, increasing their potential NP sensitivity.Flavour and CP-violating observables hence play a key role in the hunt for NP. In the SM, flavour changing neutral current processes are strongly suppressed not only by a loop factor, but also by the smallness of the off-diagonal CKM elements and the GIM mechanism. NP contributions, even if generated well beyond the TeV scale, can therefore be significant, provided the theoretical and experiment precision is sufficient. The highest NP sensitivity is obtained in rare kaon decays due to their strong CKM suppression by V * ts V td and their theoretical cleanliness, in particular in the K → πνν decays. Indeed the latter have been shown to have the potential to probe NP scales beyond 1000 TeV [1]. B decays on the other hand, while being less sensitive to extremely high scales, have the advantage to offer a multitude of observables suitable to disentangle the underlying NP structure at work.In deciphering the NP flavour structure, the study of correlations between flavour and CPviolating observables will be a crucial task. In this context, we can distinguish between two different types of correlations:• Correlations between observables within a given meson system give information on the underlying NP operator structure. In this way, contributions from vector or scalar mediators can be distinguished, or the chirality of the NP coupling to the SM quarks and leptons can be determined.• Correlations between related observables in dif...

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Loop effects of heavy new scalars and fermions in b → sμ + μ −

Cited by 127 publications

References 97 publications

Gauge-invariant implications of the LHCb measurements on lepton-flavor nonuniversality

Gauge-invariant implications of the LHCb measurements on lepton-flavor nonuniversality

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

Quo vadis flavour physics? FPCP2017 Theory Summary and Outlook

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Loop effects of heavy new scalars and fermions in b → sμ + μ −

Cited by 127 publications

References 97 publications

Gauge-invariant implications of the LHCb measurements on lepton-flavor nonuniversality

Gauge-invariant implications of the LHCb measurements on lepton-flavor nonuniversality

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

Quo vadis flavour physics? FPCP2017 Theory Summary and Outlook

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Product

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