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Books > Science & Mathematics > Physics > Quantum physics (quantum mechanics)
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Search for Charginos Nearly Mass-Degenerate with the Lightest Neutralino - Based on a Disappearing-Track Signature in pp Collisions at s = 8 TeV (Paperback, Softcover reprint of the original 1st ed. 2016)
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Search for Charginos Nearly Mass-Degenerate with the Lightest Neutralino - Based on a Disappearing-Track Signature in pp Collisions at s = 8 TeV (Paperback, Softcover reprint of the original 1st ed. 2016)
Series: Springer Theses
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In this book, the anomaly mediated supersymmetry breaking (AMSB)
model is explored by searching for charged winos with their
subsequent decays collected with the ATLAS detector at the Large
Hadron Collider (LHC). The author develops a new method, called
"re-tracking," to detect charged winos that decay before reaching
the Semiconductor Tracker (SCT) detector. Because the nominal
tracking algorithm at the ATLAS experiment requires at least seven
successive hits in the inner tracking system, the sensitivity to
charged winos having a fraction of a nanosecond in the past
analysis was therefore limited. However, re-tracking requires a
minimum of three pixel hits and provides a fully efficient tracking
capability for charged winos traversing the pixel detector,
resulting in around about 100 times greater efficiency for charged
winos with a lifetime ~0.2 ns longer than that in past searches.
Signal topology is characterized by a jet with large transverse
momentum (pT), large missing transverse energy, and a high-pT
disappearing track. There are three types of back ground tracks:
interacting hadron tracks, charged leptons, and tracks with
mismeasured pT. A background estimation based on the Monte Carlo
(MC) simulation suffers from large uncertainties due to poor
statistics and has difficulty simulating the properties of
background tracks. Therefore, a data-driven approach has been
developed by the author of the book to estimate the background
track-pT spectrum. No significant excess above the background
expectation is observed for candidate tracks with large transverse
momentum, and constraints on the AMSB model are obtained. The
author shows that in the AMSB model, a charged wino mass below 270
GeV is excluded at 95 % confidence level, which also directly
constrains the mass of wino dark matter.
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