DsixTools: the standard model effective field theory toolkit

Celis, Alejandro; Fuentes-Martín, Javier; Vicente, Avelino; Virto, Javier

doi:10.1140/epjc/s10052-017-4967-6

Cited by 118 publications

(113 citation statements)

References 38 publications

(111 reference statements)

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“…In terms of the SMEFT operators at the electroweak scale, this corresponds to a contribution to (at least) one of the two operators in the first row of Eq. (1) (see for example [26]). Moreover, the triplet operator could at the same time solve the anomalies in the charged-currrent (R D ( * ) ) , see e.g.…”

Section: Present Limits and Hl-lhc Projectionsmentioning

confidence: 99%

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High- $$p_T$$ p T dilepton tails and flavor physics

2017

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We investigate the impact of flavor-conserving, non-universal quark-lepton contact interactions on the dilepton invariant mass distribution in p p → + − processes at the LHC. After recasting the recent ATLAS search performed at 13 TeV with 36.1 fb −1 of data, we derive the best up-to-date limits on the full set of 36 chirality-conserving four-fermion operators contributing to the processes and estimate the sensitivity achievable at the HL-LHC. We discuss how these high-p T measurements can provide complementary information to the low-p T rare meson decays. In particular, we find that the recent hints on lepton-flavor universality violation in b → sμ + μ − transitions are already in mild tension with the dimuon spectrum at high-p T if the flavor structure follows minimal flavor violation. Even if the mass scale of new physics is well beyond the kinematical reach for on-shell production, the signal in the high-p T dilepton tail might still be observed, a fact that has been often overlooked in the present literature. In scenarios where new physics couples predominantly to third generation quarks, instead, the HL-LHC phase is necessary in order to provide valuable information.

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Section: Present Limits and Hl-lhc Projectionsmentioning

confidence: 99%

“…When comparing lowand high-energy measurements, in principle the renormalization group effects should be taken into account. Since these effects in this case are small, we neglect them (see for example [26]). …”

Section: Present Limits and Hl-lhc Projectionsmentioning

confidence: 99%

High- $$p_T$$ p T dilepton tails and flavor physics

2017

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“…There are ongoing discussions of the possible systematic effects and the uncertaina e-mail: patrick.tunney@kcl.ac.uk ties in the SM calculations, so the jury is still out on the significances of these flavour anomalies [12]. In the meantime, it is interesting to explore possible interpretations and look for other phenomenological signatures that might corroborate them [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

“…In the wake of this recent report of μ-e non-universality in B → K * + − decay [1,2], several phenomenological analyses favour an anomalous non-SM contribution to the coefficient of the dimension-6 operator O ≡ (sγ μ P R b)(μγ μ μ) [13][14][15][16][17][18][19]27]. A popular interpretation of this anomaly is that it is due to the exchange of a U(1) gauge boson Z with non-universal couplings to both quarks and leptons [15,[22][23][24]27,28,31,[33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52].…”

Section: Introductionmentioning

confidence: 99%

Anomaly-free models for flavour anomalies

2018

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We explore the constraints imposed by the cancellation of triangle anomalies on models in which the flavour anomalies reported by LHCb and other experiments are due to an extra U(1) gauge boson Z . We assume universal and rational U(1) charges for the first two generations of lefthanded quarks and of right-handed up-type quarks but allow different charges for their third-generation counterparts. If the right-handed charges vanish, cancellation of the triangle anomalies requires all the quark U(1) charges to vanish, if there are either no exotic fermions or there is only one Standard Model singlet dark matter (DM) fermion. There are non-trivial anomaly-free models with more than one such 'dark' fermion, or with a single DM fermion if right-handed up-type quarks have non-zero U(1) charges. In some of the latter models the U(1) couplings of the first-and secondgeneration quarks all vanish, weakening the LHC Z constraint, and in some other models the DM particle has purely axial couplings, weakening the direct DM scattering constraint. We also consider models in which anomalies are cancelled via extra vector-like leptons, showing how the prospective LHC Z constraint may be weakened because the Z → μ + μ − branching ratio is suppressed relative to other decay modes.

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“…With these expressions at hand, we determine the implications of the LHCb measurements, not only on the coefficients of the SMEFT operators at low energies, but also on their values at the high-energy scale where they are generated by the decoupling of some unknown heavy degrees of freedom. For this purpose we will make use of DsixTools [102], a Mathematica package for the handling of the dimensionsix SMEFT [102], which implements the complete oneloop Renormalization Group Equations (RGEs) of the SMEFT. This package will also allow us to consider the generation of other (unwanted) effective operators at low energies due to the RGE evolution of the SMEFT operators and find which of these imply relevant constraints on the scenarios that explain the LHCb measurements.…”

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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DsixTools: the standard model effective field theory toolkit

Cited by 118 publications

References 38 publications

High- $$p_T$$ p T dilepton tails and flavor physics

High- $$p_T$$ p T dilepton tails and flavor physics

Anomaly-free models for flavour anomalies

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

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