FLAG Review 2019

Aoki, Sinya; Aoki, Yasumichi; Bečirević, Damir; Blum, Tom; Colangelo, Gilberto; Collins, Sara; Morte, Michele Della; Dimopoulos, P.; Dürr, Stephan; Fukaya, Hidenori; Golterman, Maarten; Gottlieb, Steven; Gupta, Rajan; Hashimoto, S.; Heller, Urs M.; Herdoíza, Gregorio; Horsley, R.; Jüttner, Andreas; Kaneko, T.; Lin, C.-J. David; Lunghi, Enrico; Mawhinney, Robert D.; Nicholson, Amy; Onogi, Tetsuya; Peña, Carol; Portelli, Antonin; Ramos, Alberto; Sharpe, Stephen R.; Simone, J. N.; Simula, Silvano; Sommer, Rainer; Water, R. Van de; Vladikas, A.; Wenger, Urs; Wittig, Hartmut

doi:10.1140/epjc/s10052-019-7354-7

Cited by 642 publications

(450 citation statements)

References 1,075 publications

(2,098 reference statements)

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“…Both κ and λ 0 are obtained from FLAG 2019 [52], where λ 0 is taken from 2+1+1 flavor simulations and κ is from 2+1 flavor simulations. Only one 2+1+1 flavor result for κ is available, so we choose to use the 2+1 flavor simulation so as not to tie our results to a single external measurement.…”

Section: A General Setupmentioning

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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Section: A General Setupmentioning

confidence: 99%

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

2020

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“…The decay constants f D + and f D + s are determined from lattice QCD calculations. For our analysis, we use the values determined by the FLAG working group [32]:…”

Section: (S)mentioning

confidence: 99%

Testing lepton flavour universality with (semi)-leptonic $$\varvec{D_{(s)}}$$ decays

Fleischer

Koole

2020

Eur. Phys. J. C

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Data in B-meson decays indicate violations of lepton flavour universality, thereby raising the question about such phenomena in the charm sector. We perform a model-independent analysis of NP contributions in (semi)-leptonic decays of D (s) mesons which originate from c → d¯ ν and c → s¯ ν charge-current interactions. Starting from the most general low-energy effective Hamiltonian containing fourfermion operators and the corresponding short-distance coefficients, we explore the impact of new (pseudo)-scalar, vector and tensor operators and constrain their effects through the interplay with current data. We pay special attention to the elements |V cd | and |V cs | of the Cabibbo-Kobayashi-Maskawa matrix and extract them from the D (s) decays in the presence of possible NP decay contributions, comparing them with determinations utilizing unitarity. We find a picture in agreement with the Standard Model within the current uncertainties. Using the results from our analysis, we make also predictions for leptonic D + (s) → e + ν e modes which could be hugely enhanced with respect to their tiny Standard Model branching ratios. It will be interesting to apply our strategy at the future high-precision frontier.

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“…This will give the largest contribution due to the larger hadronic matrix elements of the left-right type operators [170]. The size of a contribution to K is estimated as…”

Section: B Higher Dimensional Operators In Kähler Potentialmentioning

confidence: 99%

A low-scale flavon model with a ℤN symmetry

Higaki

Kawamura

2020

J. High Energ. Phys.

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We propose a model that explains the fermion mass hierarchy by the Froggatt-Nielsen mechanism with a discrete Z F N symmetry. As a concrete model, we study a supersymmetric model with a single flavon coupled to the minimal supersymmetric Standard Model. Flavon develops a TeV scale vacuum expectation value for realizing flavor hierarchy, an appropriate µ-term and the electroweak scale, hence the model has a low cutoff scale. We demonstrate how the flavon is successfully stabilized together with the Higgs bosons in the model. The discrete flavor symmetry Z F N controls not only the Standard Model fermion masses, but also the Higgs potential and a mass of the Higgsino which is a good candidate for dark matter. The hierarchy in the Higgs-flavon sector is determined in order to make the model anomaly-free and realize a stable electroweak vacuum. We show that this model can explain the fermion mass hierarchy, realistic Higgs-flavon potential and thermally produced dark matter at the same time. We discuss flavor violating processes induced by the light flavon which would be detected in future experiments. N sym-1 Recently, it is proposed that a flavon can be identified as the QCD axion [3-8] 2 See, e.g., Refs. [35,36] for recent models with a flavor modular symmetry and also for such interactions in string models.3 Models with a combination of Higgs doublets H u H d as a flavon are studied in Refs. [41][42][43].

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FLAG Review 2019

Cited by 642 publications

References 1,075 publications

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

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

Testing lepton flavour universality with (semi)-leptonic $$\varvec{D_{(s)}}$$ decays

A low-scale flavon model with a ℤN symmetry

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