Abstract
Pair production of new vector-like quarks in pp collisions is considered model independent as it is usually dominated by QCD production. We discuss the interpretation of vector-like quark searches in the case that QCD is not the only relevant production mechanism for the new quarks. In particular we consider the effect of a new massive color octet vector boson with sizeable decay branching ratio into the new quarks. We pay special attention to the sensitivity of the Large Hadron Collider experiments, both in run-1 and early run-2, to differences in the kinematical distributions from the different production mechanisms. We have found that even though there can be significant differences in some kinematical distributions at the parton level, the differences are washed out at the reconstruction level. Thus, the published experimental results can be reinterpreted in models with heavy gluons by simply rescaling the production cross section.
Highlights
QCD QCD+heavy gluon only (HG) 0.5 s = 8 TeV0 500 1000 1500 2000 2500 3000 HT=Σ(pjTet) [GeV]0 200 400 600 800 1000 1200 1400 M(Zb) [GeV]√ Figure 6
The goal of our study is to investigate if the large mass of the heavy gluon has a significant impact on the kinematical distributions used in VLQ seaches
Of sL = 0.78 and sL = 0.29, respectively. As it will become clear our goal is to show that the kinematical distributions of the reconstructed objects in VLQ searches are not affected in a significant way by the presence of the heavy gluon
Summary
CHM with partial compositeness represent a well-motivated class of models of dynamical EWSB They usually predict a number of relatively light VLQ with large couplings to the top (and bottom) quark, the so-called top partners, and new vector resonances, possibly in the octet representation of the color group that couple sizeably to the top quark and its partners. As it will become clear our goal is to show that the kinematical distributions of the reconstructed objects in VLQ searches are not affected in a significant way by the presence of the heavy gluon This effect is not very sensitive to the degree of compositeness of the LH top quark, a fact that we implicitly check by not keeping sL fixed in our analyses. We emphasize again that this variation goes in the direction of making the eventual differences between the two production mechanisms larger and if no significant differences are found in this case, they are not expected to arise in the usual case with a wider heavy gluon.
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