Extending the Limits in the Hunt for Long-lived Heavy Neutral Leptons with the ATLAS Experiment at the Large Hadron Collider at CERN PDF Download

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Extending the Limits in the Hunt for Long-lived Heavy Neutral Leptons with the ATLAS Experiment at the Large Hadron Collider at CERN

Extending the Limits in the Hunt for Long-lived Heavy Neutral Leptons with the ATLAS Experiment at the Large Hadron Collider at CERN PDF Author: Christian Appelt
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

Book Description
Englische Version: A search for a long-lived, heavy neutral lepton ($\mathcal{N}$) in 139~fb$ {-1}$ of $\sqrt{s}=13$~TeV $pp$ collision data collected between 2015 and 2018 by the ATLAS detector at the Large Hadron Collider is presented. The $\mathcal{N}$ is assumed to be produced via $W \rightarrow \mathcal{N} \mu$ or $W \rightarrow \mathcal{N} e$ and decays into two charged leptons and a neutrino, forming a unique displaced vertex signature. A novel technique is used to reconstruct the $\mathcal{N}$ mass that discriminates between signal and background. No signal is observed, and limits are set on the squared mixing parameters of the $\mathcal{N}$ with the left-handed neutrino states for the $\mathcal{N}$ mass range $3$~GeV~$

Extending the Limits in the Hunt for Long-lived Heavy Neutral Leptons with the ATLAS Experiment at the Large Hadron Collider at CERN

Extending the Limits in the Hunt for Long-lived Heavy Neutral Leptons with the ATLAS Experiment at the Large Hadron Collider at CERN PDF Author: Christian Appelt
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

Book Description
Englische Version: A search for a long-lived, heavy neutral lepton ($\mathcal{N}$) in 139~fb$ {-1}$ of $\sqrt{s}=13$~TeV $pp$ collision data collected between 2015 and 2018 by the ATLAS detector at the Large Hadron Collider is presented. The $\mathcal{N}$ is assumed to be produced via $W \rightarrow \mathcal{N} \mu$ or $W \rightarrow \mathcal{N} e$ and decays into two charged leptons and a neutrino, forming a unique displaced vertex signature. A novel technique is used to reconstruct the $\mathcal{N}$ mass that discriminates between signal and background. No signal is observed, and limits are set on the squared mixing parameters of the $\mathcal{N}$ with the left-handed neutrino states for the $\mathcal{N}$ mass range $3$~GeV~$

Searches for Dijet Resonances

Searches for Dijet Resonances PDF Author: Lydia Audrey Beresford
Publisher: Springer
ISBN: 331997520X
Category : Science
Languages : en
Pages : 175

Book Description
This book addresses one of the most intriguing mysteries of our universe: the nature of dark matter. The results presented here mark a significant and substantial contribution to the search for new physics, in particular for new particles that couple to dark matter. The first analysis presented is a search for heavy new particles that decay into pairs of hadronic jets (dijets). This pioneering analysis explores unprecedented dijet invariant masses, reaching nearly 7 TeV, and sets constraints on several important new physics models. The two subsequent analyses focus on the difficult low dijet mass region, down to 200 GeV, and employ a novel technique to efficiently gather low-mass dijet events. The results of these analyses transcend the long-standing constraints on dark matter mediator particles set by several existing experiments.
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