Journal article
Observation of the Z →ψ + - Decay in pp Collisions at s =13 TeV
Physical review letters, Vol.121(14), 141801
2018
DOI: 10.1103/PhysRevLett.121.141801
PMID: 30339440
Abstract
This Letter presents the observation of the rare Z boson decay Z→ψ + -. Here, ψ represents contributions from direct J/ψ and ψ(2S)→J/ψX, + - 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/ψ + - to the decay Z→μ+μ-μ+μ- within a fiducial phase space is measured to be B(Z→J/ψ + -)/B(Z→μ+μ-μ+μ-)=0.67±0.18(stat)±0.05(syst).
Details
- Title: Subtitle
- Observation of the Z →ψ + - Decay in pp Collisions at s =13 TeV
- Creators
- CMS CollaborationB. Bilki - University of IowaW ClaridaK Dilsiz - University of Iowa, Physics and AstronomyS. Durgut - University of IowaR. P. Gandrajula - University of IowaM. Haytmyradov - University of IowaV. Khristenko - University of IowaJ-P Merlo - University of IowaA Mestvirishvili - University of Iowa, Physics and AstronomyA Moeller - University of IowaJ Nachtman - University of Iowa, Physics and AstronomyH Ogul - University of Iowa, Physics and AstronomyY Onel - University of Iowa, Physics and AstronomyF Ozok - University of IowaA Penzo - University of Iowa, Physics and AstronomyC. Snyder - University of IowaE Tiras - University of Iowa, Physics and AstronomyJ Wetzel - University of Iowa, Physics and Astronomy
- Resource Type
- Journal article
- Publication Details
- Physical review letters, Vol.121(14), 141801
- DOI
- 10.1103/PhysRevLett.121.141801
- PMID
- 30339440
- NLM abbreviation
- Phys Rev Lett
- ISSN
- 0031-9007
- eISSN
- 1079-7114
- Language
- English
- Date published
- 2018
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984443742102771
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