A search for additional evidence for the rare kaon decay K+-->pi(+)nunu; has been made with a new data set comparable in sensitivity to the previous exposure that produced a single event. No new events were found in the pion momentum region examined, 211
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Search for a Higgs Portal Scalar Decaying to Electron-Positron Pairs in the MicroBooNE Detector.
Phys Rev Lett
October 2021
Brookhaven National Laboratory (BNL), Upton, New York 11973, USA.
We present a search for the decays of a neutral scalar boson produced by kaons decaying at rest, in the context of the Higgs portal model, using the MicroBooNE detector. We analyze data triggered in time with the Fermilab NuMI neutrino beam spill, with an exposure of 1.93×10^{20} protons on target.
View Article and Find Full Text PDFStudy of the K_{L}→π^{0}νν[over ¯] Decay at the J-PARC KOTO Experiment.
Phys Rev Lett
March 2021
Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA.
The rare decay K_{L}→π^{0}νν[over ¯] was studied with the dataset taken at the J-PARC KOTO experiment in 2016, 2017, and 2018. With a single event sensitivity of (7.20±0.
View Article and Find Full Text PDFLight Scalars and the Koto Anomaly.
Phys Rev Lett
May 2020
C. N. Yang Institute for Theoretical Physics, Stony Brook University, Stony Brook, New York 11794, USA.
We show that the recent excess presented by KOTO in their search for K_{L}→π^{0}νν[over ¯] may be due to weakly coupled scalars produced from Kaon decays. We study two concrete realizations, the minimal Higgs portal and a hadrophilic scalar model, and demonstrate that they can explain the observed events while satisfying existing limits. The simplicity of these models, and their possible relations to interesting UV constructions, provides strong theoretical motivation for a new physics interpretation of the KOTO data.
View Article and Find Full Text PDFNew Physics Implications of Recent Search for K_{L}→π^{0}νν[over ¯] at KOTO.
Phys Rev Lett
February 2020
Department of Physics, Florida State University, Tallahassee, Florida 32306, USA.
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View Article and Find Full Text PDFSearch for K_{L}→π^{0}νν[over ¯] and K_{L}→π^{0}X^{0} Decays at the J-PARC KOTO Experiment.
Phys Rev Lett
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Department of Physics, Yamagata University, Yamagata 990-8560, Japan.
A search for the rare decay K_{L}→π^{0}νν[over ¯] was performed. With the data collected in 2015, corresponding to 2.2×10^{19} protons on target, a single event sensitivity of (1.
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