Search for low mass vector resonances decaying into quark-antiquark pairs in proton-proton collisions at √s=13 TeV

• Main Authors: Sirunyan, A. M., Tumasyan, A. R., Adam, Wolfgang, Ambrogi, Federico, Asilar, Ece, Md. Ali, Mohd. Adli
• Format: Article
• Language: English; English; English
• Published: Springer Nature 2018
• Subjects: Q Science (General); QC Physics
• Online Access: http://irep.iium.edu.my/65216/1/65216_Search%20for%20low%20mass%20vector%20resonances%20decaying_article.pdf; http://irep.iium.edu.my/65216/2/65216_Search%20for%20low%20mass%20vector%20resonances%20decaying_scopus.pdf; http://irep.iium.edu.my/65216/13/65216%20Search%20for%20low%20mass%20vector%20resonances%20decaying%20into%20quark-antiquark%20pairs%20in%20proton-proton%20collisions%20at%20%E2%88%9As%3D13%20TeV_wos.pdf; http://irep.iium.edu.my/65216/; https://link.springer.com/content/pdf/10.1007%2FJHEP01%282018%29097.pdf

A search for narrow vector resonances decaying into quark-antiquark pairs is presented. The analysis is based on data collected in proton-proton collisions at √ s = 13 TeV with the CMS detector at the LHC, corresponding to an integrated luminosity of 35.9 fb−1 . The hypothetical resonance is produced with sufficiently high transverse momentum that its decay products are merged into a single jet with two-prong substructure. A signal would be identified as a peak over a smoothly falling background in the distribution of the invariant mass of the jet, using novel jet substructure techniques. No evidence for such a resonance is observed within the mass range of 50–300 GeV. Upper limits at 95% confidence level are set on the production cross section, and presented in a mass-coupling parameter space. The limits further constrain simplified models of dark matter production involving a mediator interacting between quarks and dark matter particles through a vector or axial-vector current. In the framework of these models, the results are the most sensitive to date, extending for the first time the search region to masses below 100 GeV.