Dark-sector physics in the search for the rare decays $$K^+\rightarrow \pi ^+ \nu {\bar{\nu }}$$ K+→π+νν¯ and $$K_L\rightarrow \pi ^0 \nu {\bar{\nu }}$$ KL→π0νν¯

Dark-sector physics in the search for the rare decays $$K^+\rightarrow \pi ^+ \nu {\bar{\nu }}$$ K+→π+νν¯ and $$K_L\rightarrow \pi ^0 \nu {\bar{\nu }}$$ KL→π0νν¯

Abstract We compute the contribution of the decays $$K_L \rightarrow \pi ^0 Q {\bar{Q}}$$ KL→π0QQ¯ and $$K^+ \rightarrow \pi ^+ Q {\bar{Q}}$$ K+→π+QQ¯ , where Q is a dark fermion of the dark sector, to the measured widths for the rare decays $$K^+\rightarrow \pi ^+ \nu {\bar{\nu }}$$ K+→π+νν¯ and $$...

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Main Authors: Marco Fabbrichesi, Emidio Gabrielli
Format: Article
Language:English
Published: SpringerOpen 2020-06-01
Series:European Physical Journal C: Particles and Fields
Online Access:http://link.springer.com/article/10.1140/epjc/s10052-020-8103-7
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spelling doaj-4b69fd136b484d5a8b8e69bea080f6202020-11-25T02:26:47ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60441434-60522020-06-018061910.1140/epjc/s10052-020-8103-7Dark-sector physics in the search for the rare decays $$K^+\rightarrow \pi ^+ \nu {\bar{\nu }}$$ K+→π+νν¯ and $$K_L\rightarrow \pi ^0 \nu {\bar{\nu }}$$ KL→π0νν¯Marco Fabbrichesi0Emidio Gabrielli1INFN, Sezione di TriesteINFN, Sezione di TriesteAbstract We compute the contribution of the decays $$K_L \rightarrow \pi ^0 Q {\bar{Q}}$$ KL→π0QQ¯ and $$K^+ \rightarrow \pi ^+ Q {\bar{Q}}$$ K+→π+QQ¯ , where Q is a dark fermion of the dark sector, to the measured widths for the rare decays $$K^+\rightarrow \pi ^+ \nu {\bar{\nu }}$$ K+→π+νν¯ and $$K_L\rightarrow \pi ^0 \nu {\bar{\nu }}$$ KL→π0νν¯ . The recent experimental limit for $$\varGamma (K^+ \rightarrow \pi ^+ \nu {\bar{\nu }})$$ Γ(K+→π+νν¯) from NA62 sets a new and very strict bound on the dark-sector parameters. A branching ratio for $$K_L \rightarrow \pi ^0 Q {\bar{Q}}$$ KL→π0QQ¯ within the reach of the KOTO sensitivity is possible. The Grossman–Nir bound is weakened by the asymmetric effect of the different kinematic cuts enforced by the NA62 and KOTO experiments. This last feature holds true for all models where the decay into invisible states takes place through a light or massless intermediate state.http://link.springer.com/article/10.1140/epjc/s10052-020-8103-7
collection DOAJ
language English
format Article
sources DOAJ
author Marco Fabbrichesi
Emidio Gabrielli
spellingShingle Marco Fabbrichesi
Emidio Gabrielli
Dark-sector physics in the search for the rare decays $$K^+\rightarrow \pi ^+ \nu {\bar{\nu }}$$ K+→π+νν¯ and $$K_L\rightarrow \pi ^0 \nu {\bar{\nu }}$$ KL→π0νν¯
European Physical Journal C: Particles and Fields
author_facet Marco Fabbrichesi
Emidio Gabrielli
author_sort Marco Fabbrichesi
title Dark-sector physics in the search for the rare decays $$K^+\rightarrow \pi ^+ \nu {\bar{\nu }}$$ K+→π+νν¯ and $$K_L\rightarrow \pi ^0 \nu {\bar{\nu }}$$ KL→π0νν¯
title_short Dark-sector physics in the search for the rare decays $$K^+\rightarrow \pi ^+ \nu {\bar{\nu }}$$ K+→π+νν¯ and $$K_L\rightarrow \pi ^0 \nu {\bar{\nu }}$$ KL→π0νν¯
title_full Dark-sector physics in the search for the rare decays $$K^+\rightarrow \pi ^+ \nu {\bar{\nu }}$$ K+→π+νν¯ and $$K_L\rightarrow \pi ^0 \nu {\bar{\nu }}$$ KL→π0νν¯
title_fullStr Dark-sector physics in the search for the rare decays $$K^+\rightarrow \pi ^+ \nu {\bar{\nu }}$$ K+→π+νν¯ and $$K_L\rightarrow \pi ^0 \nu {\bar{\nu }}$$ KL→π0νν¯
title_full_unstemmed Dark-sector physics in the search for the rare decays $$K^+\rightarrow \pi ^+ \nu {\bar{\nu }}$$ K+→π+νν¯ and $$K_L\rightarrow \pi ^0 \nu {\bar{\nu }}$$ KL→π0νν¯
title_sort dark-sector physics in the search for the rare decays $$k^+\rightarrow \pi ^+ \nu {\bar{\nu }}$$ k+→π+νν¯ and $$k_l\rightarrow \pi ^0 \nu {\bar{\nu }}$$ kl→π0νν¯
publisher SpringerOpen
series European Physical Journal C: Particles and Fields
issn 1434-6044
1434-6052
publishDate 2020-06-01
description Abstract We compute the contribution of the decays $$K_L \rightarrow \pi ^0 Q {\bar{Q}}$$ KL→π0QQ¯ and $$K^+ \rightarrow \pi ^+ Q {\bar{Q}}$$ K+→π+QQ¯ , where Q is a dark fermion of the dark sector, to the measured widths for the rare decays $$K^+\rightarrow \pi ^+ \nu {\bar{\nu }}$$ K+→π+νν¯ and $$K_L\rightarrow \pi ^0 \nu {\bar{\nu }}$$ KL→π0νν¯ . The recent experimental limit for $$\varGamma (K^+ \rightarrow \pi ^+ \nu {\bar{\nu }})$$ Γ(K+→π+νν¯) from NA62 sets a new and very strict bound on the dark-sector parameters. A branching ratio for $$K_L \rightarrow \pi ^0 Q {\bar{Q}}$$ KL→π0QQ¯ within the reach of the KOTO sensitivity is possible. The Grossman–Nir bound is weakened by the asymmetric effect of the different kinematic cuts enforced by the NA62 and KOTO experiments. This last feature holds true for all models where the decay into invisible states takes place through a light or massless intermediate state.
url http://link.springer.com/article/10.1140/epjc/s10052-020-8103-7
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AT emidiogabrielli darksectorphysicsinthesearchfortheraredecayskrightarrowpinubarnukpnnandklrightarrowpi0nubarnuklp0nn
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