Search for CP violation in tt¯ production and decay in proton-proton collisions at √s=8 TeV

• Main Authors: Khachatryan, Vardan, Sirunyan, A. M., Tumasyan, A. R., Adam, Wolfgang, Asilar, Ece, Md. Ali, Mohd. Adli
• Format: Article
• Language: English; English
• Published: Springer Nature 2017
• Subjects: Q Science (General); QC Physics
• Online Access: http://irep.iium.edu.my/63064/1/63064_Search%20for%20CP%20violation%20in%20tt%C2%AF%20production_article.pdf; http://irep.iium.edu.my/63064/2/63064_Search%20for%20CP%20violation%20in%20tt%C2%AF%20production_scopus.pdf; http://irep.iium.edu.my/63064/; https://link.springer.com/content/pdf/10.1007%2FJHEP03%282017%29101.pdf

: The results of a first search for CP violation in the production and decay of top quark-antiquark (tt¯) pairs are presented. The search is based on asymmetries in T-odd, triple-product correlation observables, where T is the time-reversal operator. The analysis uses a sample of proton-proton collisions at √ s = 8 TeV collected by the CMS experiment, corresponding to an integrated luminosity of 19.7 fb−1 . Events are selected having one electron or muon and at least four jets. The T-odd observables are measured using four-momentum vectors associated with tt¯ production and decay. The measured asymmetries exhibit no evidence for CP-violating effects, consistent with the expectation from the standard model.