Search for R-parity violating chargino and neutralino decays in e+e− collisions up to s=183 GeV

doi:10.1016/S0370-2693(99)00680-2

Open AccessJournal Article10.1016/S0370-2693(99)00680-2

Search for R-parity violating chargino and neutralino decays in e+e− collisions up to s=183 GeV

M. Acciarri, +420 more

- 22 Jul 1999

- Physics Letters B

- Vol. 459, pp 354-366

11

TL;DR: In this article, a search for chargino and neutralino pair production in collisions at center-of-mass energies between 161~\textrm{Ge\kern -0.1em V} and 183~ ε ≥ 0.1m V was performed under the assumptions that R-parity is not conserved and that only purely leptonic or hadronic R parity violating decays are allowed.

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Figures

Table 2 Processes and topologies considered in the l coupling analysis

Fig. 1 . Distributions of a) the number of tracks, b) the number of leptons, c) the normalised visible energy and d) ln( y34) after the l ijk preselection. The solid histograms show the normalised sum of Standard Model processes. The dotted and dashed histograms show two examples of signal, with dominant coupling l 133. The dotted histograms represent the process e + e~ — y^y0, for M-o = 91 GeV, corresponding to one hundred times the expected cross section. The dashed ones represent e + e~ — , with M- ± = 91 GeV and DM = 50 GeV, corresponding to four times the ex pected cross section.

Table 3 Processes and topologies considered in the l J coupling analyses for events containing two, four or six resolved jets

Table 6 Number of expected background and observed data events for the different selections

Fig. 2. Distributions of a) ln(y34), b) thrust, c) ln(y45) and d) the narrow jet broadening after the Aj preselection. The solid his tograms show Standard Model processes at /s =183 GeV. The dashed and dotted histograms show two examples of signal, with dominant coupling AX112 . The dashed histograms represent the process e+ e— ™ xYi’T0, with M-0 = 90GeV, corresponding to five hundred times the expected cross section. The dotted ones represent the same process, with M-0 = 30 GeV, corresponding to twenty times the expected cross section.

Table 4 Efficiency ranges of y 0y0 and y,' y i selections for direct R-parity violating neutralino and chargino decays, at 's = 1 83 GeV. In case of the process yq y |, the lowest mass value considered is My + = 1 5 GeV for A 133 and 45 GeV for A'! 1 2

Citations

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