Abstract
We present a calculation of the next-to-leading order QCD corrections to weakino+squark production processes at hadron colliders and their implementation in the framework of the POWHEG-BOX, a tool for the matching of fixed-order perturbative calculations with parton-shower programs. Particular care is taken in the subtraction of on-shell resonances in the real-emission corrections that have to be assigned to production processes of a different type. In order to illustrate the capabilities of our code, representative results are shown for selected SUSY parameter points in the pMSSM11. The perturbative stability of the calculation is assessed for the pp → {tilde{upchi}}_1^0{tilde{d}}_L process. For the squark+chargino production process pp → {upchi}_1^{-}{tilde{u}}_L distributions of the chargino’s decay products are provided with the help of the decay feature of PYTHIA 8.
Highlights
JHEP12(2021)020 interacting DM candidates, large spatial extra dimensions, and SUSY particles in several compressed scenarios [19], where the masses of SUSY particles are very close to each other
We present a calculation of the next-to-leading order QCD corrections to weakino+squark production processes at hadron colliders and their implementation in the framework of the POWHEG-BOX, a tool for the matching of fixed-order perturbative calculations with parton-shower programs
In this article we presented a calculation of the next-to-leading order (NLO)-QCD corrections to the entire range of weakino+squark production processes, and their matching to parton-shower programs
Summary
Weakino-squark production at hadron colliders at leading order proceeds via two topologies, illustrated in figure 1: s-channel processes mediated by a quark, and t-channel processes mediated by a squark. A significant technical complication is represented by the fact that in some of the real-emission diagrams an intermediate particle, namely a squark or a gluino, can become on-shell Such resonances appear in both the q q and the g g channels. We observed that the total cross section does not depend on the value of the regulator, as long as this value is chosen to be sufficiently small so that we have numerically reached the narrow-width limit For both the gluino and the squark resonances, the ratio between the regulator and the mass of the resonant particle should not be larger than 10−4. We performed the calculation of the NLO cross section for χ01dL using an artificial SUSY spectrum in which the mass values lead to the simultaneous appearance of gluino and squark resonances. As an additional check of our implemention, we reproduced the results presented in ref. [17] and found, within the attainable accuracy, good agreement with them if adding squarks and antisquarks for the individual production processes
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
