Search for a heavy composite Majorana neutrino in events with dilepton signatures from proton-proton collisions at √s=13 Tev

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Küçük Resim

Tarih

2023

Dergi Başlığı

Dergi ISSN

Cilt Başlığı

Yayıncı

Elsevier

Erişim Hakkı

info:eu-repo/semantics/openAccess

Özet

Results are presented of a search for a heavy Majorana neutrino N ? decaying into two same-flavor leptons ? (electrons or muons) and a quark-pair jet. A model is considered in which the N ? is an excited neutrino in a compositeness scenario. The analysis is performed using a sample of proton-proton collisions at & RADIC;s = 13 TeV recorded by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of 138 fb-1. The data are found to be in agreement with the standard model prediction. For the process in which the N ? is produced in association with a lepton, followed by the decay of the N ? to a same-flavor lepton and a quark pair, an upper limit at 95% confidence level on the product of the cross section and branching fraction is obtained as a function of the N ? mass mN ? and the compositeness scale ?. For this model the data exclude the existence of Ne (N & mu;) for mN ? below 6.0 (6.1) TeV, at the limit where mN ? is equal to ?. For mN ? N 1 TeV, values of ? less than 20 (23) TeV are excluded. These results represent a considerable improvement in sensitivity, covering a larger parameter space than previous searches in pp collisions at 13 TeV.

Açıklama

Anahtar Kelimeler

CMS, LHC, Composite Fermions, Heavy Leptons

Kaynak

Physics Letters B

WoS Q Değeri

Q1

Scopus Q Değeri

Q1

Cilt

843

Sayı

Künye