Next-to-leading QCD effect to the quark compositeness search at the LHC

Jun Gao; Chong Sheng Li; Jian Wang; Hua Xing Zhu; C. -P. Yuan

doi:10.1103/PhysRevLett.106.142001

Next-to-leading QCD effect to the quark compositeness search at the LHC

High Energy Physics - Phenomenology 2011-04-20 v2 High Energy Physics - Experiment

Authors: Jun Gao , Chong Sheng Li , Jian Wang , Hua Xing Zhu , C. -P. Yuan

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Abstract

Recently, the CMS and ATLAS Collaborations at the CERN Large Hadron Collider (LHC) have set exclusion limits on the quark compositeness scale by comparing their data to the leading order and the scaled next-to-leading order (NLO) QCD calculations, respectively. In this Letter, we present the exact NLO QCD corrections to the dijet production induced by the quark contact interactions. We show that as compared to the exact calculation, the scaled NLO QCD prediction adopted by the ATLAS Collaboration has overestimated the new physics effect on some direct observables by more than 30% and renders a higher limit on the quark compositeness scale. The destructive contribution from the exact NLO correction will also lower the compositeness scale limit set by the CMS Collaboration.

Keywords

quark compositeness next-to-leading order QCD dijet production contact interactions LHC exclusion limits

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@article{arxiv.1101.4611,
  title  = {Next-to-leading QCD effect to the quark compositeness search at the LHC},
  author = {Jun Gao and Chong Sheng Li and Jian Wang and Hua Xing Zhu and C. -P. Yuan},
  journal= {arXiv preprint arXiv:1101.4611},
  year   = {2011}
}

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Published version in Phys.Rev.Lett

Next-to-leading QCD effect to the quark compositeness search at the LHC

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