KTeV R^{0} Search plots
Updated July 7, 2002.
[R0 Search Results]
"Search for Light Gluinos via Decays Containing
pi^{+}pi^{} or pi^{0}
from a Neutral Hadron Beam at Fermialb"

paper_theory.eps
Fig.1. M_{R0}  M_{~gamma} vs M_{R0} showing the region allowed by cosmological arguments, 1.3 < r < 1.8 (shaded). The dashed lines represent the lowest level of sensitivity for the various decay modes.


paper_mass.eps
Fig.2. M_{pi+ pi} distribution with all but P_{T}^{2} and KL > pi+ pi pi0 specific cuts (a), and all cuts (b). The data (dots), sum of all MC (solid line) are shown. Suppression below 0.45 GeV/c^{2} is due to the online filter prescale. The separate contributions from semileptonic decays (dashed and dotted lines) are also shown in (a). Distrubutions due to two sample R^{0}'s of life time 5 x 10^{8} sec using the predicted flux (dashed and dotted lines) are also shown in (b).


paper_accept.eps
Fig.3. The 90% C.L. upper limit on the R^{0}/K^{0} ratio, and the expectation, for r=1.4, tau(R^{0}) = 5 x 10^{8} sec.


paper_fluxtime.eps
Fig.4. Upper limits with 90% C.L. on the R^{0}/K^{0} flux ratio as a function of R^{0} lifetime, for two M_{R0}, M_{~gamma} combinations, with masses listed in GeV/c^{2}. The dotted lines show the expectation for the flux ratio, and the stars mark the corresponding lifetime limits.


paper_quiggplot.eps
Fig.5. R^{0} masslifetime regions excluded at 90% C.L., for the decay R^{0}> pi+ pi ~gamma, for values of r=1.3, 1.4, 1.55, and 1.73. The lowe redges are due to the kinematic limit of M_{R0}  M_{~gamma} = 2M_{pi}.


paper_pi0pt.eps
Fig.6. The P_{T} distribution for gamma gamma events from narrowbeam run (dots). The background from KL and hyperon decays is shown by the solid line. The arrow indicates the R^{0} signal region. The MC simulations for M_{R0} = 0.8, 1.0 GeV/c^{2} (dashed, dotted lines) are also shown, both for r=1.4.


paper_qfpi0.eps
Fig.7. R^{0} masslifetime regions excluded using pQCD for r=1.3 and 1.4. The exclusion from the pi0 analysis (solid lines) and pi+ pi (dashed lines) analysis is shown.


paper_pi0exclude.eps
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paper_pt2plot.eps
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