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• W2996536746 abstract "In this work we investigate the implication of $Kto pi nu bar{nu}$ from the recent KOTO and NA62 measurements for generic neutrino interactions and the new physics scale in effective field theories. The interactions between quarks and left-handed Standard Model (SM) neutrinos are first described by the low energy effective field theory (LEFT) below the electroweak scale. We match them to the chiral perturbation theory ($chi$PT) at the chiral symmetry breaking scale to calculate the branching fractions of Kaon semi-invisible decays and match them up to the SM effective field theory (SMEFT) to constrain new physics above the electroweak scale. In the framework of effective field theories, we prove that the Grossman-Nir bound is valid for both dim-6 and dim-7 LEFT operators, and the dim-6 vector and scalar operators dominantly contribute to Kaon semi-invisible decays based on LEFT and chiral power counting rules. They are induced by multiple dim-6 lepton-number-conserving operators and one dim-7 lepton-number-violating operator in the SMEFT, respectively. In the lepton-number-conserving $sto d$ transition, the $Kto pi nu bar{nu}$ decays provide the most sensitive probe for the operators with $tautau$ component and point to a corresponding new physics scale of $Lambda_{rm NP} in[47~text{TeV},~72~text{TeV}]$ associated with a single effective coefficient. The lepton-number-violating operator can also explain the observed $Ktopinubar{nu}$ discrepancy with the SM prediction within a narrow range $Lambda_{rm NP}in [19.4~text{TeV},~21.5~text{TeV}]$, which is consistent with constraints from Kaon invisible decays." @default.
• W2996536746 created "2019-12-26" @default.
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• W2996536746 date "2020-03-17" @default.
• W2996536746 modified "2023-10-18" @default.
• W2996536746 title "Implication of <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi>K</mml:mi><mml:mo stretchy=false>→</mml:mo><mml:mi>π</mml:mi><mml:mi>ν</mml:mi><mml:mover accent=true><mml:mrow><mml:mi>ν</mml:mi></mml:mrow><mml:mrow><mml:mo stretchy=false>¯</mml:mo></mml:mrow></mml:mover></mml:mrow></mml:math> for generic neutrino interactions in effective field theories" @default.
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• W2996536746 doi "https://doi.org/10.1103/physrevd.101.055019" @default.
• W2996536746 hasPublicationYear "2020" @default.
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