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Enhancing Neutrino Mass Resolution through Semi-Leptonic B Decay Reconstruction Techniques

This study explores the reconstruction of neutrino mass from semi-leptonic B decays using Monte Carlo (MC) simulations. We analyze effective techniques to identify B decay products, applying MC truth and Ghit matching to understand reconstruction effects. Our preliminary findings focus on improving neutrino mass resolution by addressing multiple factors like tracking errors, material interactions, and event selection to eliminate unrecoverable data. Recent enhancements to the Gutils package and Gtrack have laid the groundwork for robust analysis, emphasizing the importance of systematic improvements in tracking and reconstruction strategies.

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Enhancing Neutrino Mass Resolution through Semi-Leptonic B Decay Reconstruction Techniques

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  1. Neutrino mass resolution study • Study Neutrino mass reconstruction in MC • Study semi-leptonic B decays • Recent reskim • Use MC truth to identify B decay products • Use (Ghit) MC matching to study reconstruction effects • Identify which effects have the most impact on neutrino mass resolution • Use Mini information to improve reconstruction • Work through effects in order of importance • Define event selection to remove ‘unrecoverable’ data • Status • Tooling-up mostly complete • Gutils package • Gtrack bugs identified and fixed or worked-around • Preliminary plots (without Reco matching) David Nathan Brown 1 Semi-leptonic recoil group 5 August, 2004

  2. 60% of skimmed generic B0 MC have a semi-leptonic B decay • Use GTrack (MC truth) P4 • Follow B decay to the first (prompt) long-lived particles • Neutrino mass2 computed as B P4 - S long-lived P4 David Nathan Brown 2 Semi-leptonic recoil group 5 August, 2004

  3. Prompt = not a decay product of a long-lived particle • Observable = long-lived - neutrinos • Measurable = Observable - neutral hadrons • Detectable = Measurable with crude detector acceptance David Nathan Brown 3 Semi-leptonic recoil group 5 August, 2004

  4. Next Step - study reco effects • Multiply-counted objects • loopers • ghosts • decays (mother + daughter) • split track-Emc • Material interactions (mother + daughters) • Lost particles • acceptance • Below momentum threshold • Material interaction • Resolution • Gaussian • Non-gaussian • merged decays • pat rec errors • inverted track direction • wrong decay point (for V0s) • Background • machine background tracks and clusters • PID error (wrong track mass) David Nathan Brown 4 Semi-leptonic recoil group 5 August, 2004

  5. Reconstruction Improvements • Tracking • Add Svt dE/dx as a momentum constraint on svt-only tracks • Add beamspot as a point on low-momentum tracks • Look for lost svt-only tracks using beamspot + 2 hits • Remove hits with bad timing or fit consistency using final Kalman fit • Merge (or eliminate) loopers and ghosts using full Kalman fit • Use track fit hypo chisq differences as a ‘last-resort’ PID • Neutrals • Associate multiple (splitoff) bumps to a single hadronic track • Identify events with neutral hadrons using Ifr + Emc information • Other • Use material map to improve Brem correction • Reconstruct nuclear interactions • Reconstruct single-photon gamma conversions David Nathan Brown 5 Semi-leptonic recoil group 5 August, 2004

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