Search for long-lived heavy neutrinos in the decays of B mesons produced in proton-proton collisions at $$ sqrt{s} $$ = 13 TeV Journal Article uri icon

Overview

abstract

  • Abstract; A search for long-lived heavy neutrinos (N) in the decays of B mesons produced in proton-proton collisions at $$ sqrt{s} $$; ; s; ; = 13 TeV is presented. The data sample corresponds to an integrated luminosity of 41.6 fb1 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 < mN < 3 GeV and decay lengths in the range 102 < cτN < 104 mm, where τN is the N proper mean lifetime. Signal events are defined by the signature B → BNX; N → ±π, where the leptons B and 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 ±π invariant mass distributions. Limits at 95% confidence level on the sum of the squares of the mixing amplitudes between heavy and light neutrinos, -VN-2, and on cτN are obtained in different mixing scenarios for both Majorana and Dirac-like N particles. The most stringent upper limit -VN-2 < 2.0 × 105 is obtained at mN = 1.95 GeV for the Majorana case where N mixes exclusively with muon neutrinos. The limits on -VN-2 for masses 1 < mN < 1.7 GeV are the most stringent from a collider experiment to date.

publication date

  • June 27, 2024

has restriction

  • gold

Date in CU Experts

  • July 10, 2024 2:44 AM

Full Author List

  • Hayrapetyan A; Tumasyan A; Adam W; Andrejkovic JW; Bergauer T; Chatterjee S; Damanakis K; Dragicevic M; Hussain PS; Jeitler M

author count

  • 2384

Other Profiles

Electronic International Standard Serial Number (EISSN)

  • 1029-8479

Additional Document Info

volume

  • 2024

issue

  • 6

number

  • 183