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Evading the Grossman-Nir bound with ∆I = 3/2 new physics.
- Source :
- Journal of High Energy Physics; Aug2020, Vol. 2020 Issue 8, pN.PAG-N.PAG, 1p
- Publication Year :
- 2020
-
Abstract
- Rare kaon decays with missing energy, K → π+E<subscript>miss</subscript>, have received considerable attention because their rates can be calculated quite precisely within the standard model (SM), where the missing energy is carried away by an undetected neutrino- antineutrino pair. Beyond the SM, clean theoretical predictions can also be made regarding these processes. One such prediction is the so-called Grossman-Nir (GN) bound, which states that the branching fractions of the K<subscript>L</subscript> and K<superscript>+</superscript> modes must satisfy the relation ℬ K L → π 0 + E miss < ∼ 4.3 ℬ K + → π + + E miss and applies within and beyond the SM, as long as the hadronic transitions change isospin by ∆I = 1/2. In this paper we extend the study of these modes to include new-physics scenarios where the missing energy is due to unobserved lepton-number-violating neutrino pairs, invisible light new scalars, or pairs of such scalars. The new interactions are assumed to arise above the electroweak scale and described by an effective field theory. We explore the possibility of violating the GN bound through ∆I = 3/2 contributions to the K → π transitions within these scenarios and find that large violations are only possible in the case where the missing energy is due to an invisible light new scalar. [ABSTRACT FROM AUTHOR]
- Subjects :
- PHYSICS
FORECASTING
ISOBARIC spin
POSSIBILITY
HADRONIC atoms
FRACTIONS
NEUTRINOS
Subjects
Details
- Language :
- English
- ISSN :
- 11266708
- Volume :
- 2020
- Issue :
- 8
- Database :
- Complementary Index
- Journal :
- Journal of High Energy Physics
- Publication Type :
- Academic Journal
- Accession number :
- 146006554
- Full Text :
- https://doi.org/10.1007/JHEP08(2020)034