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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 |
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 Rectorate / Rektörlük Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection |
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PhysRevLett.121.141801.pdf | Makale (Article) | 443.7 kB | Adobe PDF | View/Open |
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