A search for long-lived particles decaying into muon pairs is performed using proton-proton collisions at a center-of-mass energy of 13 TeV, collected by the CMS experiment at the LHC in 2017 and 2018, corresponding to an integrated luminosity of 101 fb(-1). The data sets used in this search were collected with a dedicated dimuon trigger stream with low transverse momentum thresholds, recorded at high rate by retaining a reduced amount of information, in order to explore otherwise inaccessible phase space at low dimuon mass and nonzero displacement from the primary interaction vertex. No significant excess of events beyond the standard model expectation is found. Upper limits on branching fractions at 95% confidence level are set on a wide range of mass and lifetime hypotheses in beyond the standard model frameworks with the Higgs boson decaying into a pair of long-lived dark photons, or with a long-lived scalar resonance arising from a decay of a b hadron. The limits are the most stringent to date for substantial regions of the parameter space. These results can be also used to constrain models of displaced dimuons that are not explicitly considered in this paper.

Search for long-lived particles decaying into muon pairs in proton-proton collisions at sqrt(s)=13 TeV collected with a dedicated high-rate data stream

Cappati, A;Amapane, N;Argiro, S;Bellan, R;Bellora, A;Costa, M;Covarelli, R;Kiani, B;Migliore, E;Monteil, E;Obertino, MM;Pacher, L;Shchelina, K;Siviero, F;Sola, V;Solano, A;Soldi, D;Tornago, M;Vagnerini, A;Rumerio, P;Ravera, F;Salvatico, R;
2022-01-01

Abstract

A search for long-lived particles decaying into muon pairs is performed using proton-proton collisions at a center-of-mass energy of 13 TeV, collected by the CMS experiment at the LHC in 2017 and 2018, corresponding to an integrated luminosity of 101 fb(-1). The data sets used in this search were collected with a dedicated dimuon trigger stream with low transverse momentum thresholds, recorded at high rate by retaining a reduced amount of information, in order to explore otherwise inaccessible phase space at low dimuon mass and nonzero displacement from the primary interaction vertex. No significant excess of events beyond the standard model expectation is found. Upper limits on branching fractions at 95% confidence level are set on a wide range of mass and lifetime hypotheses in beyond the standard model frameworks with the Higgs boson decaying into a pair of long-lived dark photons, or with a long-lived scalar resonance arising from a decay of a b hadron. The limits are the most stringent to date for substantial regions of the parameter space. These results can be also used to constrain models of displaced dimuons that are not explicitly considered in this paper.
2022
2022
4
1
44
Beyond Standard Model; Dark Matter; Hadron-Hadron Scattering
Tumasyan, A; Adam, W; Andrejkovic, JW; Bergauer, T; Chatterjee, S; Dragicevic, M; Del Valle, AE; Fruhwirth, R; Jeitler, M; Krammer, N; Lechner, L; Lik...espandi
File in questo prodotto:
File Dimensione Formato  
JHEP04(2022)062.pdf

Accesso aperto

Tipo di file: PDF EDITORIALE
Dimensione 4.87 MB
Formato Adobe PDF
4.87 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1886314
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 23
  • ???jsp.display-item.citation.isi??? 10
social impact