Beautiful and charming chromodipole moments

Haisch, Ulrich; Koole, Gabriël

doi:10.1007/jhep09(2021)133

Cited by 10 publications

(11 citation statements)

References 96 publications

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“…There are several studies of the electron and/or neutron EDMs in SUSY models [15][16][17][18], in Composite Higgs models [19][20][21], in Leptoquark models [22][23][24][25], in complex two-Higgs and three-Higgs doublet models [26][27][28][29][30] and in scotogenic models [31]. On the model independent side, [32] provides an analysis of the electron EDM including some contributions that arise at two-loop and at dimension-8 level, while [33] studies the neutron EDM in presence of an effective CP violating Higgs-gluon interaction encoded by a dimension-6 SMEFT operator and [34] analyzes the contribution to the neutron EDM induced by chromo-dipoles of second and third generation quarks. Other studies of EDMs in presence of dimension-six interactions involving the Higgs boson and fermion fields are performed in [35,36].…”

Section: Introductionmentioning

confidence: 99%

Electric dipole moments at one-loop in the dimension-6 SMEFT

Jonathan¹,

Theil²,

Venturini³

et al. 2021

Preprint

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In this paper we present the complete expressions of the lepton and neutron electric dipole moments (EDMs) in the Standard Model Effective Field Theory (SMEFT), up to 1-loop and dimension-6 level and including both RG running contributions and finite corrections. The latter play a fundamental role in the cases of operators that do not renormalize the dipoles, but there are also classes of operators for which they provide an important fraction, 10 − 20%, of the total 1-loop contribution, if the new physics scale is around Λ = 5 TeV. We present the full set of bounds on each individual Wilson coefficient contributing to the EDMs using both the current experimental constraints, as well as those from future experiments, which are expected to improve by at least an order of magnitude.

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Section: Introductionmentioning

confidence: 99%

Electric dipole moments at one-loop in the dimension-6 SMEFT

Jonathan¹,

Theil²,

Venturini³

et al. 2021

Preprint

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“…at 95% CL, which has been obtained in [34] from an analysis of the transverse momentum (p T ) spectrum of Z-boson production in association with b-jets as measured by ATLAS in LHC Run II [60]. We add that the nominal strongest bound on c bG has been derived in [34] and relies on high-mass b-jet pair production ATLAS data [61]. While this search imposes c bG ∈ [−149, 149] it is not clear to which extent a SMEFT treatment is trustworthy in this high-mass region, so that we do not use it here.…”

Section: Phenomenological Analysismentioning

confidence: 75%

Section: Phenomenological Analysismentioning

confidence: 97%

“…In Section 2 we have argued that the Wilson coefficient of Q bG is expected to be of O(1) in a wide class of UV-complete theories if the operator is normalised as in (2.1). While there are strong bounds on the imaginary part of C bG from the electric dipole moment of the neutron [34], the real part entering (3.7) is at present only very weakly constrained by experiments [34][35][36]. In fact, values of c bG = O(100) are compatible with all existing low-and high-energy data (see Section 4 for details), and therefore from a purely phenomenological point of view it is possible that α s /π c bG = O(1) or even larger.…”

Section: Factorisable Contributions To the H → B B Decaymentioning

confidence: 99%

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NNLO event generation for $\boldsymbol{pp \to Zh \to \ell^+\ell^- b \bar b}$ production in the SM effective field theory

Haisch¹,

Scott²,

Wiesemann³

et al. 2022

Preprint

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We consider associated Zh production with Z → + − and h → b b decays in hadronic collisions. In the framework of the Standard Model effective field theory (SMEFT) we calculate the QCD corrections to this process and achieve next-to-next-to-leading order plus parton shower (NNLO+PS) accuracy using the MiNNLO PS method. This precision is obtained for a subset of six SMEFT operators, including the corrections from effective Yukawa-and chromomagnetic dipole-type interactions. Missing higher-order QCD effects associated with the considered dimension-six operators are estimated to have a relative numerical impact of less than a percent on the total rate once existing experimental limits on the relevant Wilson coefficients are taken into account. We provide a dedicated Monte Carlo (MC) code that evaluates the NNLO SMEFT corrections on-thefly in the event generation. This MC generator is used to study the numerical impact of NNLO+PS corrections on the kinematic distributions in pp → Zh → + − b b production employing simple SMEFT benchmark scenarios. We identify the invariant mass m b b of the two b-tagged jets as well as the three-invariant jet mass m b bj as particularly interesting observables to study SMEFT effects. These distributions receive contributions that change both their normalisation and shape with the latter modifications depending on the exact jet definition. To our knowledge SMEFT effects of this type have so far not been discussed in the literature. The presented MC generator can also serve as a starting point to obtain NNLO+PS accuracy for a suitable enlarged set of effective operators in the future.

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“…Indirect limits on the charm and bottom quark EDMs were previously considered in [31] and the CEDM case was also analyzed in [32]. There the authors derived limits based on the constraints on the heavy quark CEDMs.…”

Section: Jhep07(2022)106mentioning

confidence: 99%

Improved indirect limits on charm and bottom quark EDMs

Ema

Gao

Pospelov

2022

J. High Energ. Phys.

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We derive indirect limits on the charm and bottom quark electric dipole moments (EDMs) from paramagnetic AMO and neutron EDM experiments. The charm and bottom quark EDMs generate CP-odd photon-gluon operators and light quark EDMs at the c- and b-quark mass thresholds. These CP-odd operators induce the CP-odd semi-leptonic operator CS and the neutron EDM below the QCD scale that are probed by the paramagnetic and neutron EDM experiments, respectively. The bound from CS is |dc| < 1.3 × 10−20e cm for the charm quark and |db| < 7.6 × 10−19e cm for the bottom quark, with its uncertainty estimated as 10 %. The neutron EDM provides a stronger bound, |dc| < 6 × 10−22e cm and |db| < 2 × 10−20e cm, though with a larger hadronic uncertainty.

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Beautiful and charming chromodipole moments

Cited by 10 publications

References 96 publications

Electric dipole moments at one-loop in the dimension-6 SMEFT

Electric dipole moments at one-loop in the dimension-6 SMEFT

NNLO event generation for $\boldsymbol{pp \to Zh \to \ell^+\ell^- b \bar b}$ production in the SM effective field theory

Improved indirect limits on charm and bottom quark EDMs

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