This is not the latest version of this item. The latest version can be found here.
Observation of the
Name
PhysRevLett.121.141801.pdf
Size
443.7 KB
Format
Adobe PDF
Checksum (MD5)
839bf938a59f5c93ef2af41e4c13e313
Journal
Physical Review Letters
Citation
Sirunyan, A. M., A. Tumasyan, W. Adam, F. Ambrogi, E. Asilar, T. Bergauer, J. Brandstetter, et al. “Observation of the
Z→ψℓ+ℓ−
Decay in
Pp
Collisions at
S=13 TeV.” Physical Review Letters 121, no. 14 (October 4, 2018). doi:10.1103/physrevlett.121.141801.
Version
Final published version
Abstract
© 2018 CERN, for the CMS Collaboration. 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).
Terms of Use
Creative Commons Attribution 4.0 International license
Persistent DSpace Link
DOI of Published Version
http://dx.doi.org/10.1103/PhysRevLett.121.141801
