First Results on the Rare Decay K+ → π+νν from the NA62 Experiment at CERN

The NA62 experiment at CERN Super Proton Synchrotron (SPS) is currently taking data to measure the ultra-rare decay <inline-formula> <math display="inline"> <semantics> <mrow> <msup> <mi>K</mi> <mo>+</mo> </msup> <mo>&#8...

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Main Author:	Francesco Gonnella
Format:	Article
Language:	English
Published:	MDPI AG 2018-11-01
Series:	Universe
Subjects:	NA62 Kaon physics Flavour Physics Rare decays
Online Access:	https://www.mdpi.com/2218-1997/4/11/130

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spelling	doaj-2743432c5da54149aa053e29cadd87b22020-11-24T21:11:06ZengMDPI AGUniverse2218-19972018-11-0141113010.3390/universe4110130universe4110130First Results on the Rare Decay <i>K</i><sup>+</sup> → <i>π</i><sup>+</sup><i>ν<span style="text-decoration: overline">ν</span></i> from the NA62 Experiment at CERNFrancesco Gonnella0University of Birmingham, Birmingham B15 2TT, UKThe NA62 experiment at CERN Super Proton Synchrotron (SPS) is currently taking data to measure the ultra-rare decay <inline-formula> <math display="inline"> <semantics> <mrow> <msup> <mi>K</mi> <mo>+</mo> </msup> <mo>→</mo> <msup> <mi>π</mi> <mo>+</mo> </msup> <mi>ν</mi> <mover accent="true"> <mi>ν</mi> <mo>¯</mo> </mover> </mrow> </semantics> </math> </inline-formula>. This decay, whose Branching Ratio (BR) is predicted with high precision within the Standard Model (SM), is one of the best candidates to reveal the indirect effects of New Physics (NP) at the highest mass scales. The NA62 experiment is designed to measure BR (<inline-formula> <math display="inline"> <semantics> <mrow> <msup> <mi>K</mi> <mo>+</mo> </msup> <mo>→</mo> <msup> <mi>π</mi> <mo>+</mo> </msup> <mi>ν</mi> <mover accent="true"> <mi>ν</mi> <mo>¯</mo> </mover> <mrow> <mo>)</mo> </mrow> </mrow> </semantics> </math> </inline-formula> with a decay-in-flight technique, novel for this channel. NA62 took data in 2016, 2017 and 2018; statistics collected in 2016 allows NA62 to reach the SM sensitivity for this decay, reaching the single event sensitivity (SES) and showing the proof of principle of the experiment. The preliminary result on BR (<inline-formula> <math display="inline"> <semantics> <mrow> <msup> <mi>K</mi> <mo>+</mo> </msup> <mo>→</mo> <msup> <mi>π</mi> <mo>+</mo> </msup> <mi>ν</mi> <mover accent="true"> <mi>ν</mi> <mo>¯</mo> </mover> <mrow> <mo>)</mo> </mrow> </mrow> </semantics> </math> </inline-formula> from the analysis of the 2016 data set is described.https://www.mdpi.com/2218-1997/4/11/130NA62Kaon physicsFlavour PhysicsRare decays
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Francesco Gonnella
spellingShingle	Francesco Gonnella First Results on the Rare Decay <i>K</i><sup>+</sup> → <i>π</i><sup>+</sup><i>ν<span style="text-decoration: overline">ν</span></i> from the NA62 Experiment at CERN Universe NA62 Kaon physics Flavour Physics Rare decays
author_facet	Francesco Gonnella
author_sort	Francesco Gonnella
title	First Results on the Rare Decay <i>K</i><sup>+</sup> → <i>π</i><sup>+</sup><i>ν<span style="text-decoration: overline">ν</span></i> from the NA62 Experiment at CERN
title_short	First Results on the Rare Decay <i>K</i><sup>+</sup> → <i>π</i><sup>+</sup><i>ν<span style="text-decoration: overline">ν</span></i> from the NA62 Experiment at CERN
title_full	First Results on the Rare Decay <i>K</i><sup>+</sup> → <i>π</i><sup>+</sup><i>ν<span style="text-decoration: overline">ν</span></i> from the NA62 Experiment at CERN
title_fullStr	First Results on the Rare Decay <i>K</i><sup>+</sup> → <i>π</i><sup>+</sup><i>ν<span style="text-decoration: overline">ν</span></i> from the NA62 Experiment at CERN
title_full_unstemmed	First Results on the Rare Decay <i>K</i><sup>+</sup> → <i>π</i><sup>+</sup><i>ν<span style="text-decoration: overline">ν</span></i> from the NA62 Experiment at CERN
title_sort	first results on the rare decay <i>k</i><sup>+</sup> → <i>π</i><sup>+</sup><i>ν<span style="text-decoration: overline">ν</span></i> from the na62 experiment at cern
publisher	MDPI AG
series	Universe
issn	2218-1997
publishDate	2018-11-01
description	The NA62 experiment at CERN Super Proton Synchrotron (SPS) is currently taking data to measure the ultra-rare decay <inline-formula> <math display="inline"> <semantics> <mrow> <msup> <mi>K</mi> <mo>+</mo> </msup> <mo>→</mo> <msup> <mi>π</mi> <mo>+</mo> </msup> <mi>ν</mi> <mover accent="true"> <mi>ν</mi> <mo>¯</mo> </mover> </mrow> </semantics> </math> </inline-formula>. This decay, whose Branching Ratio (BR) is predicted with high precision within the Standard Model (SM), is one of the best candidates to reveal the indirect effects of New Physics (NP) at the highest mass scales. The NA62 experiment is designed to measure BR (<inline-formula> <math display="inline"> <semantics> <mrow> <msup> <mi>K</mi> <mo>+</mo> </msup> <mo>→</mo> <msup> <mi>π</mi> <mo>+</mo> </msup> <mi>ν</mi> <mover accent="true"> <mi>ν</mi> <mo>¯</mo> </mover> <mrow> <mo>)</mo> </mrow> </mrow> </semantics> </math> </inline-formula> with a decay-in-flight technique, novel for this channel. NA62 took data in 2016, 2017 and 2018; statistics collected in 2016 allows NA62 to reach the SM sensitivity for this decay, reaching the single event sensitivity (SES) and showing the proof of principle of the experiment. The preliminary result on BR (<inline-formula> <math display="inline"> <semantics> <mrow> <msup> <mi>K</mi> <mo>+</mo> </msup> <mo>→</mo> <msup> <mi>π</mi> <mo>+</mo> </msup> <mi>ν</mi> <mover accent="true"> <mi>ν</mi> <mo>¯</mo> </mover> <mrow> <mo>)</mo> </mrow> </mrow> </semantics> </math> </inline-formula> from the analysis of the 2016 data set is described.
topic	NA62 Kaon physics Flavour Physics Rare decays
url	https://www.mdpi.com/2218-1997/4/11/130
work_keys_str_mv	AT francescogonnella firstresultsontheraredecayikisupsupipisupsupinspanstyletextdecorationoverlinenspanifromthena62experimentatcern
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First Results on the Rare Decay <i>K</i><sup>+</sup> → <i>π</i><sup>+</sup><i>ν<span style="text-decoration: overline">ν</span></i> from the NA62 Experiment at CERN

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