Search for long-lived heavy neutrinos in the decays of B mesons produced in proton-proton collisions at √s=13 TeV

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F24%3A10486957" target="_blank" >RIV/00216208:11320/24:10486957 - isvavai.cz</a>

Result on the web

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=C8uxoFfKHb" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=C8uxoFfKHb</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/JHEP06(2024)183" target="_blank" >10.1007/JHEP06(2024)183</a>

Result language

angličtina

Original language name

Search for long-lived heavy neutrinos in the decays of B mesons produced in proton-proton collisions at √s=13 TeV

Original language description

A search for long-lived heavy neutrinos (N) in the decays of B mesons produced in proton-proton collisions at root s = 13 TeV is presented. The data sample corresponds to an integrated luminosity of 41.6 fb(-1) collected in 2018 by the CMS experiment at the CERN LHC, using a dedicated data stream that enhances the number of recorded events containing B mesons. The search probes heavy neutrinos with masses in the range 1 &lt; m(N) &lt; 3 GeV and decay lengths in the range 10(-2) &lt; c tau(N) &lt; 10(4) mm, where tau(N) is the N proper mean lifetime. Signal events are defined by the signature B -&gt; l(B)NX; N -&gt; l(+/-)pi(-/+), where the leptons l(B) and l can be either a muon or an electron, provided that at least one of them is a muon. The hadronic recoil system, X, is treated inclusively and is not reconstructed. No significant excess of events over the standard model background is observed in any of the l(+/-)pi(-/+) invariant mass distributions. Limits at 95% confidence level on the sum of the squares of the mixing amplitudes between heavy and light neutrinos, vertical bar V-N vertical bar(2), and on c tau(N) are obtained in different mixing scenarios for both Majorana and Dirac-like N particles. The most stringent upper limit vertical bar V-N vertical bar(2) &lt; 2.0 x 10(-5) is obtained at m(N) = 1.95 GeV for the Majorana case where N mixes exclusively with muon neutrinos. The limits on vertical bar V-N vertical bar(2) for masses 1 &lt; m(N) &lt; 1.7 GeV are the most stringent from a collider experiment to date.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10300 - Physical sciences

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of High Energy Physics

ISSN

1029-8479

e-ISSN

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Volume of the periodical

neuveden

Issue of the periodical within the volume

6

Country of publishing house

DE - GERMANY

Number of pages

54

Pages from-to

183

UT code for WoS article

001311120600001

EID of the result in the Scopus database

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