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Observation of the Z -> psi l(+)l(-) Decay in pp Collisions at root s=13 TeV


(CMS Collaboration) Sirunyan, Albert; ...; Đurić, Senka; Lelas, Damir; Godinović, Nikola; Puljak, Ivica; Šćulac, Toni; Mesić, Benjamin; Šuša, Tatjana; Kovač, Marko et al.
Observation of the Z -> psi l(+)l(-) Decay in pp Collisions at root s=13 TeV // Physical review letters, 121 (2018), 14; 141801, 17 doi:10.1103/PhysRevLett.121.141801 (međunarodna recenzija, članak, znanstveni)


Naslov
Observation of the Z -> psi l(+)l(-) Decay in pp Collisions at root s=13 TeV

Autori
Sirunyan, Albert ; ... ; Đurić, Senka ; Lelas, Damir ; Godinović, Nikola ; Puljak, Ivica ; Šćulac, Toni ; Mesić, Benjamin ; Šuša, Tatjana ; Kovač, Marko ; Ferenček, Dinko ; Antunović, Željko ; Starodumov, Andrey ; Brigljević, Vuko ; Luetić, Jelena ; Kadija, Krešo ; ... ; Woods, Nate

Kolaboracija
CMS Collaboration

Izvornik
Physical review letters (0031-9007) 121 (2018), 14; 141801, 17

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
High energy physics ; experimental particle physics ; LHC ; CMS ; standard model

Sažetak
This Letter presents the observation of the rare Z boson decay Z→ψℓ+ℓ−. Here, ψ represents contributions from direct J/ψ and ψ(2S)→J/ψX, ℓ+ℓ− is a pair of electrons or muons, and the J/ψ meson is detected via its decay to μ+μ−. The sample of proton-proton collision data, collected by the CMS experiment at the LHC at a center-of-mass energy of 13 TeV, corresponds to an integrated luminosity of 35.9 fb−1. The signal is observed with a significance in excess of 5 standard deviations. After subtraction of the ψ(2S)→J/ψX contribution, the ratio of the branching fraction of the exclusive decay Z→J/ψℓ+ℓ− to the decay Z→μ+μ−μ+μ− within a fiducial phase space is measured to be B(Z→J/ψℓ+ℓ−)/B(Z→μ+μ−μ+μ−)=0.67±0.18(stat)±0.05(syst).

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus
  • MEDLINE


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