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

Hayrapetyan, Aram; Tumasyan, Armen; Adam, Wolfgang; Andrejkovic, Janik Walter; Bergauer, Thomas; Chatterjee, Suman; Damanakis, Konstantinos; Dragicevic, Marko; Hussain, Priya Sajid; Jeitler, Manfred

doi:10.1007/JHEP06(2024)183

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

CMS

Collaboration

Mar 7, 2024

54 pages

Published in:

JHEP 06 (2024) 183

Published: Jun 27, 2024

e-Print:

2403.04584 [hep-ex]

DOI:

10.1007/JHEP06(2024)183

Report number:

CMS-EXO-22-019,
CERN-EP-2024-053

Experiments:

CERN-LHC-CMS,
CERN-LHC-CMS

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Abstract: (Springer)

A search for long-lived heavy neutrinos (N) in the decays of B mesons produced in proton-proton collisions at

\sqrt{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 < m

_{N}

< 3 GeV and decay lengths in the range 10

^{−2}

< cτ

_{N}

< 10

^{4}

mm, where τ

_{N}

is the N proper mean lifetime. Signal events are defined by the signature B → ℓ

_{B}

NX; N → ℓ

^{±}

π

^{∓}

, 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

^{±}

π

^{∓}

invariant mass distributions. Limits at 95% confidence level on the sum of the squares of the mixing amplitudes between heavy and light neutrinos, |V

_{N}

|

^{2}

, and on cτ

_{N}

are obtained in different mixing scenarios for both Majorana and Dirac-like N particles. The most stringent upper limit |V

_{N}

|

^{2}

< 2.0 × 10

^{−5}

is obtained at m

_{N}

= 1.95 GeV for the Majorana case where N mixes exclusively with muon neutrinos. The limits on |V

_{N}

|

^{2}

for masses 1 < m

_{N}

< 1.7 GeV are the most stringent from a collider experiment to date.[graphic not available: see fulltext]

Note:

All the figures and tables, including additional supplementary figures, can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/EXO-22-019 (CMS Public Pages)

Beyond Standard Model
Hadron-Hadron Scattering
Lifetime
p p: colliding beams
neutrino: heavy
p p: scattering
B: semileptonic decay
decay: length
B: signature
recoil: hadronic

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