Please use this identifier to cite or link to this item:
Title: Observation of the Z -> psi l(+)l(-) decay in pp collisions at root s= 13 TeV
Authors: CMS Collaboration
Karapınar, Güler
Keywords: Phase space methods
Z bosons
Branching fractions
Rare decays
Hadron colliders
Standard deviation
Issue Date: Oct-2018
Publisher: American Physical Society
Source: Sirunyan, A.M., Tumasyan, A., Adam, W., Ambrogi, F., Asilar, E., Bergauer, T., Brandstetter, J. ...CMS Collaboration (2018). Observation of the Z → ψ ℓ + ℓ − decay in pp collisions at √s = 13 TeV. Physical Review Letters, 121(14). doi:10.1103/PhysRevLett.121.141801
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).
ISSN: 0031-9007
Appears in Collections:Mathematics / Matematik
PubMed İndeksli Yayınlar Koleksiyonu / PubMed Indexed Publications Collection
Rectorate / Rektörlük
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

Files in This Item:
File Description SizeFormat 
PhysRevLett.121.141801.pdfMakale (Article)443.7 kBAdobe PDFThumbnail
Show full item record

CORE Recommender


checked on Nov 25, 2023

Page view(s)

checked on Nov 27, 2023


checked on Nov 27, 2023

Google ScholarTM



Items in GCRIS Repository are protected by copyright, with all rights reserved, unless otherwise indicated.