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

Sample text

These quantities also determine the dilepton momentum in the X,” centre of mass. , if the minimum dilepton mass is not too small - then there is obviously a minimum llq mass from the Gr,+ jiiq + l;Fq + ii)l+l-q decay chain. The general expression is rather complicated but simplifies somewhat for z = 0 : 300 4, WV) Distribution of the larger llq mass at Point 5 for Ml/ > MLTaX/A and a fit described in the text. Figure 20-28 M,, WV) Figure 20-29 Distribution of the larger bbq mass at Point 5. No sideband subtraction rection has been made.

8Ejet, the jet was assumed to be a r; otherwise it was assumed to be a normal jet. The z identification or misidentification probabilities from the full simulation were then applied to obtain the reconstructed ‘t ‘s. Masses for zz pairs were calculated by smearing the generated masses with the resolution and shift from the full simulation rather than by using the jets. The charges were also assigned using the probabilities from the full simulation. This approach makes it possible to apply at least the main results from the GEANT simulation to large event samples.

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


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