Top quark jets at the LHC
作者： Leandro G. Almeida , Seung J. Lee , Gilad Perez , Ilmo Sung , Joseph Virzi
DOI: 10.1103/PHYSREVD.79.074012
关键词: Particle decay 、 Higgs boson 、 Particle physics 、 Bottom quark 、 Nuclear physics 、 Electroweak interaction 、 Physics 、 Gauge boson 、 Quark 、 Quantum chromodynamics 、 Top quark
摘要: We investigate the reconstruction of high ${p}_{T}$ hadronically decaying top quarks at Large Hadron Collider. One main challenges in identifying energetic is that decay products become increasingly collimated. This reduces efficacy conventional methods exploit topology quark chain. focus on cases where are reconstructed as a single jet, ``top jet.'' The most basic ``top-tagging'' method based jet mass measurement considered detail. To analyze feasibility top-tagging method, both theoretical and experimental aspects large QCD background contribution examined. Based factorization approach, we derive simple analytic approximation for shape spectrum. observe very good agreement with Monte Carlo simulation. consider high-${p}_{T}$ $t\overline{t}$ production standard model an example, show our distributions can efficiently characterize via sideband analyses. $25\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data, approach allows us to resolve jets ${p}_{T}\ensuremath{\ge}1\text{ }\mathrm{TeV}$, from background, about 1.5 TeV $100\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$, without relying $b$-tagging. further improve significance shapes (recently analyzed [10]), which substructure energy flow inside cone jets. A measuring polarization by using transverse momentum bottom also presented. advantages (i) driven first principle calculations, instead solely simulation; (ii) (${p}_{T}\ensuremath{\ge}1\text{ }\mathrm{TeV}$), IR-safe variables robust against detector resolution effects. Our analysis be applied other boosted massive particles such electroweak gauge bosons Higgs.
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