Muon <i>g</i> – 2 theory: The hadronic part

Jegerlehner, F.

doi:10.1051/epjconf/201816600022

Cited by 166 publications

(190 citation statements)

References 74 publications

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“…[58][59][60][61][62][63]. The current experimental result for Δm B s ¼ ð1.1688 AE 0.0014Þ × 10 −11 GeV [64] is consistent with the SM result ð1.10083 þ0.054 −0.038 Þ × 10 −11 GeV [65]. In the case of the spin-2 mediator, the operators are of dimension 8.…”

Section: B S −B S Mixingsupporting

confidence: 80%

Testing a spin-2 mediator by angular observables in b→sμ+μ−

Fajfer¹,

Melić²,

Patra³

2018

Phys. Rev. D

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We consider the effects of the spin-2 particle in the b → sμ þ μ − transition assuming that the spin-2 particle couples in a flavor-nonuniversal way to b and s quarks and in the leptonic sector couples only to the muons, thereby only contributing to the process b → sμ þ μ − . The B s −B s transition gives the strong constraint on the coupling of the spin-2 mediator and b and s quarks, while the observed discrepancy from the standard model prediction for the muon anomalous magnetic moment ðg − 2Þ μ serves to constrain the μ coupling to a spin-2 particle. We find that the spin-2 particle can modify the angular observables in the B → Kμ þ μ − and B → K Ã μ þ μ − decays and produce effects that do not exist in the standard model. The generated forward-backward asymmetries in these processes can reach 15%, while other observables for these decays receive tiny effects.

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Section: B S −B S Mixingsupporting

confidence: 80%

Testing a spin-2 mediator by angular observables in b→sμ+μ−

Fajfer¹,

Melić²,

Patra³

2018

Phys. Rev. D

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“…. The referenced contributions are: ETMC 2013 [11], HPQCD 2016 [14], Mainz 2017 [19], BMW 2017 [20], RBC/UKQCD 2018 [21], ETMC 2018 [22], SK 2019 [25], FNAL/HPQCD/MILC 2019 [24], Mainz 2019 [26], ETMC 2019 Update [30], BMW 2020 [27], HLMNT 2011 [6], DHMZ 2012 [7], DHMZ 2017 [8], Jegerlehner 2017 [9], KNT 2018 [10], DHMZ 2019 [1], and KNT 2019 [2]. The result of this work is labelled "LM 2020".…”

Section: Acknowledgmentsmentioning

confidence: 99%

Consistency of hadronic vacuum polarization between lattice QCD and the R ratio

2020

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There are emerging tensions for theory results of the hadronic vacuum polarization contribution to the muon anomalous magnetic moment both within recent lattice QCD calculations and between some lattice QCD calculations and R-ratio results. In this paper we work towards scrutinizing critical aspects of these calculations. We focus in particular on a precise calculation of Euclidean position-space windows defined by RBC/UKQCD that are ideal quantities for cross-checks within the lattice community and with R-ratio results. We perform a lattice QCD calculation using physical up, down, strange, and charm sea quark gauge ensembles generated in the staggered formalism by the MILC collaboration. We study the continuum limit using inverse lattice spacings from a −1 ≈ 1.6 GeV to 3.5 GeV, identical to recent studies by FNAL/HPQCD/MILC and Aubin et al. and similar to the recent study of BMW. Our calculation exhibits a tension for the particularly interesting window result of a ud,conn.,isospin,W µ from 0.4 fm to 1.0 fm with previous results obtained with a different discretization of the vector current on the same gauge configurations. Our results may indicate a difficulty related to estimating uncertainties of the continuum extrapolation that deserves further attention. In this work we also provide results for a ud,conn.,isospin µ , a s,conn.,isospin µ , a SIB,conn. µ for the total contribution and a large set of windows. For the total contribution, we find a HVP LO µ = 714(27)(13)10 −10 , a ud,conn.,isospin µ = 657(26)(12)10 −10 , a s,conn.,isospin µ = 52.83(22)(65)10 −10 , and a SIB,conn. µ = 9.0(0.8)(1.2)10 −10 , where the first uncertainty is statistical and the second systematic. We also comment on finite-volume corrections for the strong-isospin-breaking corrections.

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“…It is interesting to note that the current discrepancies between data and theoretical estimates for the muon and electron g − 2 have opposite signs. The difference ∆a µ ≡ a exp µ − a SM µ is non-zero and positive with a significance of 3.7σ [64][65][66][67][68], whereas the deviation is at the 2.4σ level for ∆a e ≡ a exp e − a SM e and with the opposite sign [69][70][71][72][73]. The explicit values are quoted in the first column of Table 3.…”

Section: Anomalous Magnetic Momentsmentioning

confidence: 99%

Constraints on scalar leptoquarks from lepton and kaon physics

Mandal¹,

Pich²

2019

J. High Energ. Phys.

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We present a comprehensive analysis of low-energy signals of hypothetical scalar leptoquark interactions in lepton and kaon transitions. We derive the most general effective four-fermion Lagrangian induced by tree-level scalar leptoquark exchange and identify the Wilson coefficients predicted by the five possible types of scalar leptoquarks. The current constraints on the leptoquark Yukawa couplings arising from lepton and kaon processes are worked out, including also loop-induced transitions with only leptons (or quarks) as external states. In the presence of scalar leptoquark interactions, we also derive the differential distributions for flavour-changing neutral-current transitions in semileptonic kaon modes, including all known effects within the Standard Model. Their interference with the new physics contributions could play a significant role in future improvements of those constraints that are currently hampered by poorly-determined non-perturbative parameters. *

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Muon g – 2 theory: The hadronic part

Cited by 166 publications

References 74 publications

Testing a spin-2 mediator by angular observables in b→sμ+μ−

Testing a spin-2 mediator by angular observables in b→sμ+μ−

Consistency of hadronic vacuum polarization between lattice QCD and the R ratio

Constraints on scalar leptoquarks from lepton and kaon physics

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