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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10300 - Physical sciences

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

Journal of High Energy Physics

ISSN

1029-8479

e-ISSN

—

Svazek periodika

neuveden

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

54

Strana od-do

183

Kód UT WoS článku

001311120600001

EID výsledku v databázi Scopus

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