Threshold resummation effects in the associated production of chargino and neutralino at hadron colliders
Journal Article
·
· Physical Review. D, Particles Fields
- Department of Physics, Peking University, Beijing 100871 (China)
- Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208-3112 (United States)
We investigate the QCD effects in the associated production of the chargino and the neutralino, {chi}-tilde{sub 1}{sup {+-}} and {chi}-tilde{sub 2}{sup 0}, in the minimal supersymmetric standard model at both the Fermilab Tevatron and the CERN Large Hadron Collider. We include the next-to-leading order (NLO) QCD corrections (including supersymmetric QCD) and the threshold resummation effects. Our results show that, compared to the NLO predictions, the threshold resummation effects can increase the total cross sections by 3.6% and 3.9% for the associated production of {chi}-tilde{sub 1}{sup +}{chi}-tilde{sub 2}{sup 0} and {chi}-tilde{sub 1}{sup -}{chi}-tilde{sub 2}{sup 0} at the LHC, respectively, and by 4.7% for those of {chi}-tilde{sub 1}{sup {+-}}{chi}-tilde{sub 2}{sup 0} at the Tevatron. In the invariant mass distributions the resummation effects are significant for large invariant mass. The threshold resummation reduces the dependence of the total cross sections at the LHC (Tevatron) on the renormalization/factorization scales to 5% (4%) from up to 7% (11%) at NLO.
- OSTI ID:
- 21039025
- Journal Information:
- Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 3 Vol. 77; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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