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• W2149519391 abstract "We consider the production of neutralino pairs ${stackrel{ifmmode tilde{}else ~{}fi{}}{ensuremath{chi}}}_{i}^{0}{stackrel{ifmmode tilde{}else ~{}fi{}}{ensuremath{chi}}}_{j}^{0}$ at a high energy hadron collider, putting a special emphasis on the case where one of them is the lightest neutralino ${stackrel{ifmmode tilde{}else ~{}fi{}}{ensuremath{chi}}}_{1}^{0},$ possibly constituting the main dark matter component. At tree level, the only relevant subprocess is $qoverline{q}ensuremath{rightarrow}{stackrel{ifmmode tilde{}else ~{}fi{}}{ensuremath{chi}}}_{i}^{0}{stackrel{ifmmode tilde{}else ~{}fi{}}{ensuremath{chi}}}_{j}^{0},$ while the subprocess $gstackrel{ensuremath{rightarrow}}{g}{stackrel{ifmmode tilde{}else ~{}fi{}}{ensuremath{chi}}}_{i}^{0}{stackrel{ifmmode tilde{}else ~{}fi{}}{ensuremath{chi}}}_{j}^{0}$ first appears at the one loop level. Explicit expressions for the $qoverline{q}$-helicity amplitudes are presented, including the tree level contributions and the leading-log one loop radiative corrections. For the one-loop $gstackrel{ensuremath{rightarrow}}{g}{stackrel{ifmmode tilde{}else ~{}fi{}}{ensuremath{chi}}}_{i}^{0}{stackrel{ifmmode tilde{}else ~{}fi{}}{ensuremath{chi}}}_{j}^{0}$ process, a numerical code named PLATONggnn is released, allowing the computation of $densuremath{sigma}/dmathrm{tifmmode hat{}else ^{}fi{}}$ in any MSSM model with real soft breaking parameters. It turns out that acceptable MSSM benchmark models exist for which the $qoverline{q}$ and the gluonic contributions may give comparable effects at LHC, due to the enhanced gluonic structure functions at low fractional momenta. Depending on the values of the MSSM parameters, we find that the LHC neutralino pair production may provide sensitive tests of SUSY models generating neutralino dark matter." @default.
• W2149519391 created "2016-06-24" @default.
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• W2149519391 date "2004-08-25" @default.
• W2149519391 modified "2023-09-27" @default.
• W2149519391 title "Neutralino pair production at CERN LHC" @default.
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• W2149519391 doi "https://doi.org/10.1103/physrevd.70.033011" @default.
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