Refining constraints from Borexino measurements on a light Z′-boson coupled to Lμ-Lτ current

The recent confirmation by FNAL of the (g−2)μ muon anomaly gives strong evidence for the possible existence of new physics beyond the Standard Model in the muon sector. Thus it is worthy to revisit the existing experimental constraints on models suggesting theoretically consistent explanations of th...

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Autores principales:	Sergei Gninenko, Dmitry Gorbunov
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/a7a95661b09f4797991291c343e5154b
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spelling	oai:doaj.org-article:a7a95661b09f4797991291c343e5154b2021-12-04T04:32:33ZRefining constraints from Borexino measurements on a light Z′-boson coupled to Lμ-Lτ current0370-269310.1016/j.physletb.2021.136739https://doaj.org/article/a7a95661b09f4797991291c343e5154b2021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S0370269321006791https://doaj.org/toc/0370-2693The recent confirmation by FNAL of the (g−2)μ muon anomaly gives strong evidence for the possible existence of new physics beyond the Standard Model in the muon sector. Thus it is worthy to revisit the existing experimental constraints on models suggesting theoretically consistent explanations of the anomaly. In this work, we point out that accounting for the loss of coherence between the wave packets (mass states) of solar neutrinos is important for setting limits on any model with new flavor-sensitive couplings in the neutrino sector. By taking into account this effect and considering more accurately the experimental constraints from the BOREXINO measurement of the 7Be solar neutrino interaction rate we corrected the limits previously placed on the coupling of the light Z′ to Lμ-Lτ current in the parameter space relevant to the muon (g−2)μ.Sergei GninenkoDmitry GorbunovElsevierarticlePhysicsQC1-999ENPhysics Letters B, Vol 823, Iss , Pp 136739- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Sergei Gninenko Dmitry Gorbunov Refining constraints from Borexino measurements on a light Z′-boson coupled to Lμ-Lτ current
description	The recent confirmation by FNAL of the (g−2)μ muon anomaly gives strong evidence for the possible existence of new physics beyond the Standard Model in the muon sector. Thus it is worthy to revisit the existing experimental constraints on models suggesting theoretically consistent explanations of the anomaly. In this work, we point out that accounting for the loss of coherence between the wave packets (mass states) of solar neutrinos is important for setting limits on any model with new flavor-sensitive couplings in the neutrino sector. By taking into account this effect and considering more accurately the experimental constraints from the BOREXINO measurement of the 7Be solar neutrino interaction rate we corrected the limits previously placed on the coupling of the light Z′ to Lμ-Lτ current in the parameter space relevant to the muon (g−2)μ.
format	article
author	Sergei Gninenko Dmitry Gorbunov
author_facet	Sergei Gninenko Dmitry Gorbunov
author_sort	Sergei Gninenko
title	Refining constraints from Borexino measurements on a light Z′-boson coupled to Lμ-Lτ current
title_short	Refining constraints from Borexino measurements on a light Z′-boson coupled to Lμ-Lτ current
title_full	Refining constraints from Borexino measurements on a light Z′-boson coupled to Lμ-Lτ current
title_fullStr	Refining constraints from Borexino measurements on a light Z′-boson coupled to Lμ-Lτ current
title_full_unstemmed	Refining constraints from Borexino measurements on a light Z′-boson coupled to Lμ-Lτ current
title_sort	refining constraints from borexino measurements on a light z′-boson coupled to lμ-lτ current
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/a7a95661b09f4797991291c343e5154b
work_keys_str_mv	AT sergeigninenko refiningconstraintsfromborexinomeasurementsonalightzbosoncoupledtolmltcurrent AT dmitrygorbunov refiningconstraintsfromborexinomeasurementsonalightzbosoncoupledtolmltcurrent
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Refining constraints from Borexino measurements on a light Z′-boson coupled to Lμ-Lτ current

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