Discovering heavy new physics in boosted Z channels

Z →l+l- vs Z →ν ν ¯ discovering heavy new physics in boosted Z ... backovic et al.

Mihailo Backović, Thomas Flacke, Jeong Han Kim, Seung Joon Lee

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We propose a strategy for new physics searches in channels which contain a boosted Z boson and a boosted massive jet in the final state. Our proposal exploits the previously overlooked advantages of boosted Z→νν¯ topologies, where collimated neutrinos result in signals with large missing energy. We illustrate the advantage of this channel in a case study of singly produced TeV scale charge 2/3 fermionic top partners (T′) which decay to tZ final states. A comparison with the di-leptonic channel reveals that, despite the large tt¯ background, signals with missing energy combined with jet substructure techniques offer superior probes of new physics at TeV scales. The effect can be attributed to a factor of ∼3 enhancement in the signal cross section, coming from the branching ratio of Z→νν¯. We exploit the unique event topology of singly produced top partners to suppress the tt¯ background, as well as further improve on the existing proposals to detect T′ in the boosted di-lepton channel. Our conclusions on advantages of Z→νν¯ can be extended to most resonance searches which utilize a boosted Z boson in the final state.

Original languageEnglish
Article number011701
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume92
Issue number1
DOIs
Publication statusPublished - 2015 Jul 27

Fingerprint

physics
proposals
bosons
topology
substructures
leptons
neutrinos
energy
augmentation
probes
cross sections
decay

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

Cite this

@article{86913edae82b48aeb11b288116940817,
title = "Discovering heavy new physics in boosted Z channels: Z →l+l- vs Z →ν ν ¯ discovering heavy new physics in boosted Z ... backovic et al.",
abstract = "We propose a strategy for new physics searches in channels which contain a boosted Z boson and a boosted massive jet in the final state. Our proposal exploits the previously overlooked advantages of boosted Z→νν¯ topologies, where collimated neutrinos result in signals with large missing energy. We illustrate the advantage of this channel in a case study of singly produced TeV scale charge 2/3 fermionic top partners (T′) which decay to tZ final states. A comparison with the di-leptonic channel reveals that, despite the large tt¯ background, signals with missing energy combined with jet substructure techniques offer superior probes of new physics at TeV scales. The effect can be attributed to a factor of ∼3 enhancement in the signal cross section, coming from the branching ratio of Z→νν¯. We exploit the unique event topology of singly produced top partners to suppress the tt¯ background, as well as further improve on the existing proposals to detect T′ in the boosted di-lepton channel. Our conclusions on advantages of Z→νν¯ can be extended to most resonance searches which utilize a boosted Z boson in the final state.",
author = "Mihailo Backović and Thomas Flacke and Kim, {Jeong Han} and Lee, {Seung Joon}",
year = "2015",
month = "7",
day = "27",
doi = "10.1103/PhysRevD.92.011701",
language = "English",
volume = "92",
journal = "Physical review D: Particles and fields",
issn = "0556-2821",
publisher = "American Institute of Physics Publising LLC",
number = "1",

}

TY - JOUR

T1 - Discovering heavy new physics in boosted Z channels

T2 - Z →l+l- vs Z →ν ν ¯ discovering heavy new physics in boosted Z ... backovic et al.

AU - Backović, Mihailo

AU - Flacke, Thomas

AU - Kim, Jeong Han

AU - Lee, Seung Joon

PY - 2015/7/27

Y1 - 2015/7/27

N2 - We propose a strategy for new physics searches in channels which contain a boosted Z boson and a boosted massive jet in the final state. Our proposal exploits the previously overlooked advantages of boosted Z→νν¯ topologies, where collimated neutrinos result in signals with large missing energy. We illustrate the advantage of this channel in a case study of singly produced TeV scale charge 2/3 fermionic top partners (T′) which decay to tZ final states. A comparison with the di-leptonic channel reveals that, despite the large tt¯ background, signals with missing energy combined with jet substructure techniques offer superior probes of new physics at TeV scales. The effect can be attributed to a factor of ∼3 enhancement in the signal cross section, coming from the branching ratio of Z→νν¯. We exploit the unique event topology of singly produced top partners to suppress the tt¯ background, as well as further improve on the existing proposals to detect T′ in the boosted di-lepton channel. Our conclusions on advantages of Z→νν¯ can be extended to most resonance searches which utilize a boosted Z boson in the final state.

AB - We propose a strategy for new physics searches in channels which contain a boosted Z boson and a boosted massive jet in the final state. Our proposal exploits the previously overlooked advantages of boosted Z→νν¯ topologies, where collimated neutrinos result in signals with large missing energy. We illustrate the advantage of this channel in a case study of singly produced TeV scale charge 2/3 fermionic top partners (T′) which decay to tZ final states. A comparison with the di-leptonic channel reveals that, despite the large tt¯ background, signals with missing energy combined with jet substructure techniques offer superior probes of new physics at TeV scales. The effect can be attributed to a factor of ∼3 enhancement in the signal cross section, coming from the branching ratio of Z→νν¯. We exploit the unique event topology of singly produced top partners to suppress the tt¯ background, as well as further improve on the existing proposals to detect T′ in the boosted di-lepton channel. Our conclusions on advantages of Z→νν¯ can be extended to most resonance searches which utilize a boosted Z boson in the final state.

UR - http://www.scopus.com/inward/record.url?scp=84939125298&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84939125298&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.92.011701

DO - 10.1103/PhysRevD.92.011701

M3 - Article

VL - 92

JO - Physical review D: Particles and fields

JF - Physical review D: Particles and fields

SN - 0556-2821

IS - 1

M1 - 011701

ER -