English

The CDF dijet excess and Z'_{cs} coupled to the second generation quarks

High Energy Physics - Phenomenology 2018-02-14 v2 High Energy Physics - Experiment

Abstract

Recently the CDF collaboration has reported the excess in the dijet invariant-mass distribution of the Wjj events, corresponding to a significance of 3.2 standard deviations. Considering the lack of similar excesses in the γjj\gamma jj and ZjjZ jj events yet, we propose a new Z' model: Z' couples only to the second generation quarks. Single production of \zsc\zsc as well as associated production with W,γ,ZW,\gamma, Z are mainly from the sea quarks. Only WZW Z' production has additional contribution from one valence quark and one sea quark, which is allowed by CKM mixing. We found that if the new gauge coupling is large enough, marginally permitted by perturbativity, this new model can explain the observed CDF WjjWjj anomaly as well as the lack of \gmjj\gm jj and ZjjZ jj anomalies. Vanishing coupling of Z'-b-b protects this model from the constraint of p pbar ->WH -> l\nu b \bar{b}.

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Cite

@article{arxiv.1104.4560,
  title  = {The CDF dijet excess and Z'_{cs} coupled to the second generation quarks},
  author = {Sanghyeon Chang and Kang Young Lee and Jeonghyeon Song},
  journal= {arXiv preprint arXiv:1104.4560},
  year   = {2018}
}

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