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132160.2 |
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|a dc
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|a The CMS Collaboration
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|a Massachusetts Institute of Technology. Department of Physics
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|a Massachusetts Institute of Technology. Laboratory for Nuclear Science
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|a Abercrombie, Daniel Robert
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|a Allen, Branden
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|a Azzolini, Virginia
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|a Baty, Austin Alan
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|a Bauer, Gerry P
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|a Bi, Ran
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|a Brandt, Stephanie Akemi
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|a Busza, Wit
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|a Cali, Ivan Amos
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|a D'Alfonso, Mariarosaria
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|a Demiragli, Zeynep
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|a Gomez-Ceballos, Guillelmo
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|a Goncharov, Maxim
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|a Harris, Philip Coleman
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|a Hsu, David
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|a Hu, Miao
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|a Iiyama, Yutaro
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|a Innocenti, Gian Michele
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|a Klute, Markus
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|a Kovalskyi, Dmytro
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|a Lee, Y.S.
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|a Luckey Jr, P David
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|a Maier, Benedikt
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|a Marini, Andrea Carlo
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|a McGinn, Christopher Francis
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|a Mironov, Camelia Maria
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|a Narayanan, S.
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|a Niu, Xinmei
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|a Paus, Christoph M. E.
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|a Roland, Christof
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|a Roland, Gunther M
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|a Stephans, George S. F.
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|a Sumorok, Konstanty C
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|a Velicanu, Dragos Alexandru
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|a Wang, J.
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|a Wang, T.W.
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|a Wyslouch, Boleslaw
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|a Zhaozhong, S.
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|a Observation of the Z → ψl + l − Decay in pp Collisions at ffiffi s p = 13 TeV
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|c 2022-08-18T16:27:39Z.
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|z Get fulltext
|u https://hdl.handle.net/1721.1/132160.2
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|a © 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).
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|a Article
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|t Physical Review Letters
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