A search for decays of the Higgs and Z boson to pairs of J/psi or Y(nS)(n = 1, 2, 3) mesons, with their subsequent decay to mu(+)mu(-) pairs, is presented. The analysis uses data from proton-proton collisions at root s = 13 TeV, collected with the CMS detector at the LHC in 2017 and corresponding to an integrated luminosity of 37.5 fb(-1). While an observation of such a decay with this sample would indicate the presence of physics beyond the standard model, no significant excess is observed. Upper limits at 95% confidence level are placed on the branching fractions of these decays. In the J/psi pair channel, the limits are 1.8 x 10(-3) and 2.2 x 10(-6) for the Higgs and Z boson, respectively, while in the combined Y(nS) pair channel, the limits are 1.4 x 10(-3) and 1.5 x 10(-6), respectively, when the mesons from the Higgs and Z boson decay are assumed to be unpolarized. When fully longitudinal and transverse polarizations are considered the limits reduce by about 22-29% and increase by about 10-13%, respectively. (C) 2019 The Author(s). Published by Elsevier B.V.

Sirunyan, A., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Brandstetter, J., et al. (2019). Search for Higgs and Z boson decays to J/ψ or Y pairs in the four-muon final state in proton-proton collisions at sqrt(s)=13TeV. PHYSICS LETTERS. SECTION B, 797 [10.1016/j.physletb.2019.134811].

Search for Higgs and Z boson decays to J/ψ or Y pairs in the four-muon final state in proton-proton collisions at sqrt(s)=13TeV

Benaglia A.;Beschi A.;Brivio F.;Ciriolo V.;Dinardo M. E.;Fiorendi S.;Ghezzi A.;Govoni P.;Guzzi L.;Malberti M.;Monti F.;Moroni L.;Ortona G.;Paganoni M.;Ragazzi S.;Tabarelli de Fatis T.;Zuolo D.;Lucchini M. T.;De Guio F.;
2019

Abstract

A search for decays of the Higgs and Z boson to pairs of J/psi or Y(nS)(n = 1, 2, 3) mesons, with their subsequent decay to mu(+)mu(-) pairs, is presented. The analysis uses data from proton-proton collisions at root s = 13 TeV, collected with the CMS detector at the LHC in 2017 and corresponding to an integrated luminosity of 37.5 fb(-1). While an observation of such a decay with this sample would indicate the presence of physics beyond the standard model, no significant excess is observed. Upper limits at 95% confidence level are placed on the branching fractions of these decays. In the J/psi pair channel, the limits are 1.8 x 10(-3) and 2.2 x 10(-6) for the Higgs and Z boson, respectively, while in the combined Y(nS) pair channel, the limits are 1.4 x 10(-3) and 1.5 x 10(-6), respectively, when the mesons from the Higgs and Z boson decay are assumed to be unpolarized. When fully longitudinal and transverse polarizations are considered the limits reduce by about 22-29% and increase by about 10-13%, respectively. (C) 2019 The Author(s). Published by Elsevier B.V.
Articolo in rivista - Articolo scientifico
CMS; Higgs boson; Rare decays; Standard model physics; Z boson
English
2019
797
134811
none
Sirunyan, A., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Brandstetter, J., et al. (2019). Search for Higgs and Z boson decays to J/ψ or Y pairs in the four-muon final state in proton-proton collisions at sqrt(s)=13TeV. PHYSICS LETTERS. SECTION B, 797 [10.1016/j.physletb.2019.134811].
File in questo prodotto:
Non ci sono file associati a questo prodotto.

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/10281/248067
Citazioni
  • Scopus 21
  • ???jsp.display-item.citation.isi??? 16
Social impact