Jet activity as a probe of high-mass resonance production

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• 作者：L. A. Harland-Lang ; V. A. Khoze ; M. G. Ryskin…
• 刊名：The European Physical Journal C - Particles and Fields
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：76
• 期：11
• 全文大小：843 KB
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Elementary Particles and Quantum Field Theory
  Nuclear Physics, Heavy Ions and Hadrons
  Physics beyond the Standard Model
  Measurement Science and Instrumentation
  Astronomy, Astrophysics and Cosmology
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1434-6052
• 卷排序：76

文摘

We explore the method of using the measured jet activity associated with a high-mass resonance state to determine the corresponding production modes. To demonstrate the potential of the approach, we consider the case of a resonance of mass \(M_R\) decaying to a diphoton final state. We perform a Monte Carlo study, considering three mass points \(M_R=0.75, 1.5, 2.5\) TeV, and show that the \(\gamma \gamma \), WW, gg and light and heavy \(q\overline{q}\) initiated cases lead to distinct predictions for the jet multiplicity distributions. As an example, we apply this result to the ATLAS search for resonances in diphoton events, using the 2015 data set of \(3.2\,\mathrm{fb}^{-1}\) at \(\sqrt{s}=13\) TeV. Taking the spin-0 selection, we demonstrate that a dominantly gg-initiated signal hypothesis is mildly disfavoured, while the \(\gamma \gamma \) and light quark cases give good descriptions within the limited statistics, and a dominantly WW-initiated hypothesis is found to be in strong tension with the data. We also comment on the \(b\overline{b}\) initial state, which can already be constrained by the measured b-jet multiplicity. Finally, we present expected exclusion limits with integrated luminosity, and demonstrate that with just a few 10s of \(\mathrm{fb}^{-1}\) we can expect to constrain the production modes of such a resonance.