000003238 001__ 3238
000003238 005__ 20220920063120.0
000003238 037__ $$aBELLE2-MTHESIS-2022-023
000003238 041__ $$aeng
000003238 100__ $$aDaniel Marcantonio
000003238 245__ $$aDisplaced track finding efficiency and detecting new long-lived particles at Belle II
000003238 260__ $$aMelbourne$$bThe University of Melbourne$$c2020
000003238 300__ $$a52
000003238 500__ $$aPresented on 11 11 2020
000003238 502__ $$aMSc$$bMelbourne, The University of Melbourne$$c2020
000003238 520__ $$aThere are numerous extensions to the Standard Model that introduce new particles that have long lifetimes, corresponding to a flight length of centimetres or more in a particle collider. No such particle has yet been found, with searches often being limited statistically. The high luminosity that the SuperKEKB collider provides the Belle II experiment allows grants greater statistical power in these searches than ever before, making Belle II the most sensitive experiment to date in detecting new long-lived particles in the mass range of a few Gev/c2. In this thesis, we use Monte Carlo simulations to lay the foundations for a search for long-lived particles. To construct an accurate search , precise understanding of how well the Belle II detector tracks charged particles that originate far from the interaction point is essential. We perform a measurement of displaced track finding efficiency for the first time in the Belle II experiment, using a method involving the partial reconstruction of D∗+ decays. From the result of the tracking study, combined with the outcome of the long-lived particle search we construct, we provide the most accurate estimate of Belle II’s sensitivity to new long-lived particles to date.
000003238 700__ $$aPhillip Urquijo$$edir.
000003238 8560_ $$fdmarcantonio@student.unimelb.edu.au
000003238 8564_ $$uhttps://docs.belle2.org/record/3238/files/BELLE2-MTHESIS-2022-023.pdf
000003238 980__ $$aTHESIS