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(Bad) News from Cracks

This report presents findings from the LAPP CAT Force Meeting held on May 27, 2003, led by R. Zitoun from Stony Brook. The discussion focused on the impact of cracks on energy loss and track matching in experimental physics. Key topics included the need for improved track matching resolution, detailed evaluations of crack width and energy distribution, and the significant correlation between shower shapes and crack positions. Variations in particle momentum and cluster angles were assessed, leading to critical insights for future experiments. The analysis constitutes a valuable contribution to understanding crack dynamics in high-energy particle interactions.

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(Bad) News from Cracks

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  1. (Bad) News from Cracks Robert Zitoun Stony Brook and LAPP CAT Force Meeting May 27, 2003 R. Zitoun, Stony Brook and LAPP CAT force Meeting

  2. New Track Matching CC dh vs h (mod 0.1) CC dj vs j (mod 0.2) 1cm no↑ crack ↑no • Rewrite track matching code to allow for better resolution • h modulation ± 5 mm. Period 0.05 (EM3 period) • j modulation ± 5 mm. Period 0.2 (crack period) • Note: extrapolation made with ET.Have to correct ET in the crack torecover same field integral R. Zitoun, Stony Brook and LAPP CAT force Meeting

  3. How wide is the crack • Crack with calo position(standard) • Correct calo position • Extrapolate tracks and plot trackj (mod 0.2)Loss smaller than previously thought • Moreover: analyzed clusters are matched by present tracking (might be even better) cluster angle corrected cluster angle track angle R. Zitoun, Stony Brook and LAPP CAT force Meeting

  4. Energy Loss in the Crack • Oleg gauss(20%, s = 15mrad) • Best (mass) gauss(21%, s = 16mrad) • “mine” gauss(20%, s = 7mrad) cluster angle corrected cluster angle track angle R. Zitoun, Stony Brook and LAPP CAT force Meeting

  5. Detailed Crack Study • Shower shape affected by crack • Correct cell with gauss(20%, 8 mrad) R. Zitoun, Stony Brook and LAPP CAT force Meeting

  6. Energy correction in the crack • Brute or cell correction equivalent • Not perfect • No effect above 0.02 mrad (even in not corrected angle) track angle cluster angle R. Zitoun, Stony Brook and LAPP CAT force Meeting

  7. Z mass crack>0.05 91.3 GeV 3.1±0.3% smallest distance to crack→ • p13.05 + p13.06 + r13.06 (jonas) • certified + matched • still 1.7 GeV mass differenceclose/far crack • not the crack itself? statistics? crack<0.05 89.6 GeV 3.6±0.2% R. Zitoun, Stony Brook and LAPP CAT force Meeting

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