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Pair production of neutralinos and charginos at the LHC: The role of Higgs bosons exchange

AuthorsArhrib, A.; Benbrik, Rachid ; Chabab, M.; Chen, Chuan-Hung
Issue DateDec-2011
PublisherAmerican Physical Society
CitationPhysical Review D 84(11): 115012 (2011)
AbstractWe analyze the effects of the s-channel Higgs bosons exchange on the charginos-pair and neutralinos-pair production in proton-proton collision at the CERN Large Hadron Collider (LHC) in the following channels: pp→χ˜+χ˜-/χ˜0χ˜0+X, within the minimal supersymmetric standard model (MSSM). Assuming the usual GUT relation between M1 and M2 at the weak scale, we found that substantial enhancement can be obtained through s-channel Higgs bosons exchange in the mixed regime where M2∼|μ| with moderate to large tan(beta) at the resonance of the heavy Higgs bosons. By combining the phenomenological constraints on neutralinos and charginos, we may still find regions of parameter space where charginos-pair and neutralinos-pair production at the LHC from bb̅ initial state can be large and observable at LHC. We also compute the full complete set of electroweak (EW) contributions to pp→gg→χ˜+χ˜-/χ˜0χ˜0+X at the one-loop level in the general MSSM. The analytical computation of the complete tree-level amplitude for bb̅ →χ˜+χ˜-/χ˜0χ˜0+X, including s-channel Higgs exchange, is given.
Description13 páginas, 10 figuras, 1 tabla.-- PACS numbers: 12.60.Jv, 14.80.Nb
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevD.84.115012
Appears in Collections:(IFCA) Artículos
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