Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/7747
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).
URI: https://doi.org/10.1103/PhysRevLett.121.141801
https://hdl.handle.net/11147/7747
ISSN: 0031-9007
0031-9007
1079-7114
Appears in Collections:Mathematics / Matematik
PubMed İndeksli Yayınlar Koleksiyonu / PubMed Indexed Publications Collection
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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