The CDF dijet excess from intrinsic quarks
School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, 100871, Beijing, China
2 Department of Physics and Center for Theoretical Sciences, National Taiwan University, 10617, Taipei, Taiwan
3 Institute of Particle Physics and Cosmology, Department of Physics, Shanghai JiaoTong University, 200240, Shanghai, China
Accepted: 30 November 2011
Published online: 14 December 2011
The CDF Collaboration reported an excess in the production of two jets in association with a W . We discuss constraints on possible new particle state interpretations of this excess. The fact of no statistically significant deviation from the SM expectation for Z +dijet events in CDF data disfavors the new particle explanation. We show that the nucleon intrinsic strange quarks provide an important contribution to the W boson production in association with a single top quark production. Such W +t single top quark production can contribute to the CDF W +dijet excess, thus the nucleon intrinsic quarks can provide a possible explanation to the CDF excess in W +dijet but not in Z +dijet events.
© SIF, Springer-Verlag Berlin Heidelberg, 2011