Staggered chiral perturbation theory in the two-flavor case and SU(2) analysis of the MILC data

Du, X.; Bazavov, A.; Bernard, C.; DeTar, Carleton; Freeman, Walter; Gottlieb, Steven; Heller, Urs M.; Hetrick, J. E.; Laiho, J.; Levkova, L.; Oktay, M. B.; Sugari, R.; Toussaint, D.; Water, Ruth S. Van de

doi:10.22323/1.105.0083

Cited by 5 publications

(1 citation statement)

References 14 publications

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“…4 Various mechanisms, either spontaneously or explicitly, break the G LR symmetry of the kinetic Lagrangian. First, the finite vacuum expectation values (VEVs) of the light and strange quark condensates [128,[130][131][132][133][134][135][136][137] Σ ud = − 1 2 0|uu + dd|0 MS 2 GeV + h.c. = (272 ± 5 lat ) 3 MeV 3 , (2.6a)…”

Section: Jhep09(2021)063mentioning

confidence: 99%

Portal Effective Theories. A framework for the model independent description of light hidden sector interactions

Arina

Hajer

Klose

2021

J. High Energ. Phys.

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We present a framework for the construction of portal effective theory (PETs) that couple effective field theories of the Standard Model (SM) to light hidden messenger fields. Using this framework we construct electroweak and strong scale PETs that couple the SM to messengers carrying spin zero, one half, or one. The electroweak scale PETs encompass all portal operators up to dimension five, while the strong scale PETs additionally contain all portal operators of dimension six and seven that contribute at leading order to quark-flavour violating transitions. Using the strong scale PETs, we define a set of portal currents that couple hidden sectors to QCD, and construct portal chiral perturbation theory (χPTs) that relate these currents to the light pseudoscalar mesons. We estimate the coefficients of the portal χPT Lagrangian that are not fixed by SM observations using non-perturbative matching techniques and give a complete list of the resulting one- and two-meson portal interactions. From those, we compute transition amplitudes for three golden channels that are used in hidden sector searches at fixed target experiments: i) charged kaon decay into a charged pion and a spin zero messenger, ii) charged kaon decay into a charged lepton and a spin one half messenger, and iii) neutral pion decay into a photon and a spin one messenger. Finally, we compare these amplitudes to specific expressions for models featuring light scalar particles, axion-like particles, heavy neutral leptons, and dark photons.

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Section: Jhep09(2021)063mentioning

confidence: 99%

Portal Effective Theories. A framework for the model independent description of light hidden sector interactions

Arina

Hajer

Klose

2021

J. High Energ. Phys.

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Coherent μ−e conversion at next-to-leading order

Bartolotta¹,

Ramsey-Musolf²

2018

Phys. Rev. C

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We analyze next-to-leading order (NLO) corrections and uncertainties for coherent µ − e conversion . The analysis is general but numerical results focus on 27 Al, which will be used in the Mu2E experiment. We obtain a simple expression for the branching ratio in terms of Wilson coefficients associated with possible physics beyond the Standard Model and a set of model-independent parameters determined solely by Standard Model dynamics. For scalar-mediated conversion, we find that NLO two-nucleon contributions can significantly decrease the branching ratio, potentially reducing the rate by as much as 50%. The pion-nucleon σ-term and quark masses give the dominant sources of parametric uncertainty in this case. For vectormediated conversion, the impact of NLO contributions is considerably less severe, while the present theoretical uncertainties are comparable to parametric uncertainties.

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Spectral sum of current correlators from lattice QCD

Ishikawa

Hashimoto

2021

Phys. Rev. D

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Staggered chiral perturbation theory in the two-flavor case and SU(2) analysis of the MILC data

Cited by 5 publications

References 14 publications

Portal Effective Theories. A framework for the model independent description of light hidden sector interactions

Portal Effective Theories. A framework for the model independent description of light hidden sector interactions

Coherent μ−e conversion at next-to-leading order

Spectral sum of current correlators from lattice QCD

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