ATLAS Detector, Physics Performance Tech Rpt - CH 20

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Extra resources for ATLAS Detector, Physics Performance Tech Rpt - CH 20 [Supersymmetry]

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The pairings were required to be unique, so no jet is used twice. 3. The pairing that minimised x2 = (M$ - M,)* + (M$ - Ml)* was chosen. 4. The jj momenta were resealed to obtain the correct W mass, and the jjb mass was recomputed. 20 Supersymmetty 847 ATLAS defector and physics performance Volume II 25 May 7999 Technical Design Report _ SUSY .... SM tt (siddxmd subbacfed) Figure 20-38 Top signal (open), estimated Figure 20-39 torial background duction. Point 5. combina(shaded) at Point 5, and SM ti pro- Background-subtracted top - signal at Each step narrows the width of the Mjjb peak at the top mass.

This distribution is shown in Figure 20-40 for two different values of the slepton mass. A very precise measurement of the mass seems difficult. If the iL were slightly heavier, then it would also be possible to search for a four-lepton signal from one iL + ii:1 decay and one iL + X$1+ %pZlldecay, In principle the endpoint of the trilepton mass can be used to determine the slepton mass, although the rates are marginal. 10 below. 8 Exclusive SUGRA measurements for large tan p SUGRA phenomenology for tanp > 10 is more complicated because of the need to include additional Yukawa couplings and mixings in the b and ?

5. Presumably these branching ratios could also be used in a more quantitative way to improve the measurement of tan p at Point 2, but this has not been studied. 2 Point 3 Point 3 is a low-mass point with many well-measured quantities. The best-measured ones are summarised in Table 20-7. The measurements listed below the line in the table actually determine combinations of masses. 5M - 0 rather than M- . tan C(+,rn2 . Hence the distinction is less significant than for Points 1 and 2. While the fit is done including all the information simultaneously, m1,2 is mainly determined by Mx2 - Miry, which is accurately measured from the dilepton endpoint.

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