Observation of the Z →ψ + - decay in pp collisions at s =13 TeV

• Main Authors: Sirunyan, A.M., Tumasyan, A. R., Adam, Wolfgang, Asilar, Ece, Bergauer, Thomas, Md. Ali, Mohd. Adli
• Format: Article
• Language: English; English
• Published: American Physical Society 2018
• Subjects: Q Science (General); QC Physics
• Online Access: http://irep.iium.edu.my/70337/1/70337_Observation%20of%20the%20Z%20%E2%86%92%20%CF%88l%2Bl%E2%88%92%20Decay%20in%20pp%20Collisions_article.pdf; http://irep.iium.edu.my/70337/2/70337_Observation%20of%20the%20Z%20%E2%86%92%20%CF%88l%2Bl%E2%88%92%20Decay%20in%20pp%20Collisions_scopus.pdf; http://irep.iium.edu.my/70337/; https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.121.141801

This Letter presents the observation of the rare Z boson decay Z → ψlþl−. Here, ψ represents contributions from direct J=ψ and ψð2SÞ → J=ψX, lþl− is a pair of electrons or muons, and the J=ψ meson is detected via its decay to μþμ−. The sample of proton-proton collision data, collected by the CMS...