Revisiting kaon physics in general Z scenario

Revisiting kaon physics in general Z scenario

New physics contributions to the Z penguin are revisited in the light of the recently-reported discrepancy of the direct CP violation in K→ππ. Interference effects between the standard model and new physics contributions to ΔS=2 observables are taken into account. Although the effects are overlooked...

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Main Authors: Motoi Endo, Teppei Kitahara, Satoshi Mishima, Kei Yamamoto
Format: Article
Language:English
Published: Elsevier 2017-08-01
Series:Physics Letters B
Online Access:http://www.sciencedirect.com/science/article/pii/S0370269317303891
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spelling doaj-41165743ce0a4a5eb36f1dac1e5a9b082020-11-25T03:35:16ZengElsevierPhysics Letters B0370-26932017-08-017713744Revisiting kaon physics in general Z scenarioMotoi Endo0Teppei Kitahara1Satoshi Mishima2Kei Yamamoto3Theory Center, IPNS, KEK, Tsukuba, Ibaraki 305-0801, Japan; The Graduate University of Advanced Studies (Sokendai), Tsukuba, Ibaraki 305-0801, JapanInstitute for Theoretical Particle Physics (TTP), Karlsruhe Institute of Technology, Engesserstraße 7, D-76128 Karlsruhe, Germany; Institute for Nuclear Physics (IKP), Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany; Corresponding author.Theory Center, IPNS, KEK, Tsukuba, Ibaraki 305-0801, JapanTheory Center, IPNS, KEK, Tsukuba, Ibaraki 305-0801, JapanNew physics contributions to the Z penguin are revisited in the light of the recently-reported discrepancy of the direct CP violation in K→ππ. Interference effects between the standard model and new physics contributions to ΔS=2 observables are taken into account. Although the effects are overlooked in the literature, they make experimental bounds significantly severer. It is shown that the new physics contributions must be tuned to enhance B(KL→π0νν¯), if the discrepancy of the direct CP violation is explained with satisfying the experimental constraints. The branching ratio can be as large as 6×10−10 when the contributions are tuned at the 10% level.http://www.sciencedirect.com/science/article/pii/S0370269317303891
collection DOAJ
language English
format Article
sources DOAJ
author Motoi Endo
Teppei Kitahara
Satoshi Mishima
Kei Yamamoto
spellingShingle Motoi Endo
Teppei Kitahara
Satoshi Mishima
Kei Yamamoto
Revisiting kaon physics in general Z scenario
Physics Letters B
author_facet Motoi Endo
Teppei Kitahara
Satoshi Mishima
Kei Yamamoto
author_sort Motoi Endo
title Revisiting kaon physics in general Z scenario
title_short Revisiting kaon physics in general Z scenario
title_full Revisiting kaon physics in general Z scenario
title_fullStr Revisiting kaon physics in general Z scenario
title_full_unstemmed Revisiting kaon physics in general Z scenario
title_sort revisiting kaon physics in general z scenario
publisher Elsevier
series Physics Letters B
issn 0370-2693
publishDate 2017-08-01
description New physics contributions to the Z penguin are revisited in the light of the recently-reported discrepancy of the direct CP violation in K→ππ. Interference effects between the standard model and new physics contributions to ΔS=2 observables are taken into account. Although the effects are overlooked in the literature, they make experimental bounds significantly severer. It is shown that the new physics contributions must be tuned to enhance B(KL→π0νν¯), if the discrepancy of the direct CP violation is explained with satisfying the experimental constraints. The branching ratio can be as large as 6×10−10 when the contributions are tuned at the 10% level.
url http://www.sciencedirect.com/science/article/pii/S0370269317303891
work_keys_str_mv AT motoiendo revisitingkaonphysicsingeneralzscenario
AT teppeikitahara revisitingkaonphysicsingeneralzscenario
AT satoshimishima revisitingkaonphysicsingeneralzscenario
AT keiyamamoto revisitingkaonphysicsingeneralzscenario
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