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Extra resources for ATLAS Detector, Physics Performance Tech Rpt - CH 20 [Supersymmetry]
For the LHC case, the squark mass plays the role of the initial energy, and invariant masses rather than laboratory energies must be used, but the basic idea is the same. 9 below. In this sense the determination of the masses is model independent; the feasibility of doing such an analysis is of course very model dependent. At Point 5, the dilepton mass from ji,” + iftlF + ifl+l- is fixed by the jit ,i, , and jip masses and by z = co&*, where 8* is the decay angle in the ‘i$ centre of mass relative to the F direction.
I : I: The slepton mass for m. 5 = 75 GeV differs from that for Point 5 by only 9 GeV. 4 even with an integrated luminosity of 300 fb- l. : :) 0 :I loo '. : 150 200 M, WV) Figure 20-53 p+p- mass distribution for modified Point 5 with m. 5 = 75 GeV (solid) and for Point 5 (dashed). ’ 20 Supersymmetry 863 ATLAS detector and physics performance Technical Design Report Volume II 25 May 7999 luminosity to use that analysis to distinguish mO 5 = 150 GeV , for which the 7L is 24 GeV heavier than at Point 5.
5 = 75 GeV (solid) and for Point 5 (dashed). ’ 20 Supersymmetry 863 ATLAS detector and physics performance Technical Design Report Volume II 25 May 7999 luminosity to use that analysis to distinguish mO 5 = 150 GeV , for which the 7L is 24 GeV heavier than at Point 5. The rate of course becomes smaller for larger m0 5 ; at some point one must rely on the absence of a direct slepton signal. Direct it&. 1 and the other via iL + Xtf+ jL1’l + %PrZ’r. This branching ratio is too small to be observable at Point 5 but increases for larger m0, 5 .