18 research outputs found
Perturbative extension of the standard model with a 125 GeV Higgs and Magnetic Dark Matter
We introduce a perturbative extension of the standard model featuring a new
dark matter sector together with a 125 GeV Higgs. The new sector consists of a
vector-like heavy electron E, a complex scalar electron S and a standard model
singlet Dirac fermion \chi. The interactions among the dark matter candidate
\chi and the standard model particles occur via loop-induced processes
involving the operator SE\chi y, with y being the Yukawa-like coupling. The
model is an explicit underlying realization of the light magnetic dark matter
effective model introduced earlier to alleviate the tension among several
direct dark matter search experiments. We further constrain the parameters of
the underlying theory using results from the Large Hadron Collider. The
extension can accommodate the recently observed properties of the Higgs-like
state and leads to interesting predictions. Finally we show that the model's
collider phenomenology and constraints nicely complement the ones coming from
dark matter searches.Comment: Final version to match the one published in Phys. Rev.
Custodial Vector Model
We analyze the Large Hadron Collider (LHC) phenomenology of heavy vector
resonances with a spectral global symmetry. This
symmetry partially protects the electroweak S-parameter from large
contributions of the vector resonances. The resulting custodial vector model
spectrum and interactions with the standard model fields lead to distinct
signatures at the LHC in the diboson, dilepton and associated Higgs channels.Comment: 35 pages, 45 figure
W Plus Multiple Jets at the LHC with High Energy Jets
We study the production of a W boson in association with n hard QCD jets (for
n>=2), with a particular emphasis on results relevant for the Large Hadron
Collider (7 TeV and 8 TeV). We present predictions for this process from High
Energy Jets, a framework for all-order resummation of the dominant
contributions from wide-angle QCD emissions. We first compare predictions
against recent ATLAS data and then shift focus to observables and regions of
phase space where effects beyond NLO are expected to be large.Comment: 19 pages, 9 figure
Pseudo Goldstone Bosons Phenomenology in Minimal Walking Technicolor
We construct the non-linear realized Lagrangian for the Goldstone Bosons
associated to the breaking pattern of SU(4) to SO(4). This pattern is expected
to occur in any Technicolor extension of the standard model featuring two Dirac
fermions transforming according to real representations of the underlying gauge
group. We concentrate on the Minimal Walking Technicolor quantum number
assignments with respect to the standard model symmetries. We demonstrate that
for, any choice of the quantum numbers, consistent with gauge and Witten
anomalies the spectrum of the pseudo Goldstone Bosons contains electrically
doubly charged states which can be discovered at the Large Hadron Collider.Comment: 25 pages, 5 figure
Les Houches 2013: Physics at TeV Colliders: Standard Model Working Group Report
This Report summarizes the proceedings of the 2013 Les Houches workshop on
Physics at TeV Colliders. Session 1 dealt primarily with (1) the techniques for
calculating standard model multi-leg NLO and NNLO QCD and NLO EW cross sections
and (2) the comparison of those cross sections with LHC data from Run 1, and
projections for future measurements in Run 2.Comment: Proceedings of the Standard Model Working Group of the 2013 Les
Houches Workshop, Physics at TeV Colliders, Les houches 3-21 June 2013. 200
page
Report of the Snowmass 2013 energy frontier QCD working group
This is the summary report of the energy frontier QCD working group prepared
for Snowmass 2013. We review the status of tools, both theoretical and
experimental, for understanding the strong interactions at colliders. We
attempt to prioritize important directions that future developments should
take. Most of the efforts of the QCD working group concentrate on proton-proton
colliders, at 14 TeV as planned for the next run of the LHC, and for 33 and 100
TeV, possible energies of the colliders that will be necessary to carry on the
physics program started at 14 TeV. We also examine QCD predictions and
measurements at lepton-lepton and lepton-hadron colliders, and in particular
their ability to improve our knowledge of strong coupling constant and parton
distribution functions.Comment: 62 pages, 31 figures, Snowmass community summer study 201
Composite higgs to two photons and gluons
We introduce a simple framework to estimate the composite Higgs boson coupling to two-photon in technicolor extensions of the standard model. The same framework allows us to predict the composite Higgs to two-gluon process. We compare the decay rates with the standard model ones and show that the corrections are typically of order one. We suggest, therefore, that the two-photon decay process can be used to disentangle a light composite Higgs from the standard model one. We also show that the Tevatron results for the gluongluon fusion production of the Higgs either exclude the techniquarks to carry color charges to the 95% confidence level, if the composite Higgs is light, or that the latter must be heavier than around 200 GeV. © 2011 World Scientific Publishing Company
W+ Multiple Jets at the LHC with High Energy Jets
We study the production of a W boson in association with n hard QCD jets (for n ≥ 2), with a particular emphasis on results relevant for the Large Hadron Collider (7 TeV and 8 TeV). We present predictions for this process from High Energy Jets, a framework for all-order resummation of the dominant contributions from wide-angle QCD emissions. We first compare predictions against recent ATLAS data and then shift focus to observables and regions of phase space where effects beyond NLO are expected to be large
W ′ and Z ′ limits for minimal walking technicolor
We interpret the recent data on nonobservation of Z ′ and W ′ bosons, reported by CMS, within minimal walking technicolor models and use them to constrain the couplings and spectrum of the theory. We provide the reach for both exclusion and possible observation for the LHC with 5fb -1 at 7TeV in the center of mass energy, and 100fb -1 at 13TeV. © 2012 American Physical Society