Publications (5)0 Total impact
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ABSTRACT: New vector-like quarks with electric charge 2/3 and -1/3 can be singly
produced at hadron colliders through the exchange of a color octet vector
resonance in models of strong electroweak symmetry breaking. We show that
electroweak symmetry breaking effects can have a significant impact on the
decay pattern of these new quarks. In particular, single production of charge
-1/3 fermion resonances, mediated by a color octet vector resonance, typically
results in an $H b\bar{b}$ final state with a sizeable cross section and very
distinctive kinematics. We consider the leading $H\to b\bar{b}$ decay and show
that the $4b$ signal can be very efficiently disentangled from the background:
heavy octet masses of up to 3 TeV can be tested with the data already collected
at the LHC and up to 5 TeV with an integrated luminosity of 100 fb$^{-1}$ at
$\sqrt{s}=14$ TeV. We also discuss the kinematical differences between the
$Hb\bar{b}$ production in models of strong electroweak symmetry breaking and
supersymmetric models and the implications on the phenomenology of non-minimal
composite Higgs models.
05/2013;
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ABSTRACT: We discuss some aspects of the interplay between the top quark and the Higgs
boson at the LHC. First we describe what indirect information on the top Yukawa
coupling can be extracted from measurements in the Higgs sector. We then show
that the study of processes involving $Ht\bar{t}$ and $Hb\bar{b}$ final states
can give us information on the spectrum in models of strong electroweak
symmetry breaking. In particular, we introduce a novel analysis of the
$Hb\bar{b}\to bb\bar{b}\bar{b}$ channel with an excellent discovery potential
at the LHC.
03/2013;
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ABSTRACT: New vector-like quarks can mix sizably with first generation Standard Model
quarks without conflicting with current experimental constraints. Searches for
such new quarks have been performed in pair production and electroweak single
production channels with subsequent decays into electroweak gauge bosons. To
fully explore the underlying structure of the theory the channels with heavy
quark decays into Higgs bosons are crucial and in this article we consider for
the first time the LHC reach for such channels. The two main production
mechanisms involve single production of new quarks through the fusion of a
vector boson and the Higgs and single production in association with a Higgs
boson. We show that both channels have promising reach at the LHC and that they
complement the current direct searches involving decays into electroweak gauge
bosons.
02/2013;
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ABSTRACT: Composite Higgs models are only now starting to be probed at the Large Hadron
Collider by Higgs searches. We point out that new resonances, abundant in these
models, can mediate new production mechanisms for the composite Higgs. The new
channels involve the exchange of a massive color octet and single production of
new fermion resonances with subsequent decays into the Higgs and a Standard
Model quark. The sizable cross section and very distinctive kinematics allow
for a very clean extraction of the signal over the background with high
statistical significance. Heavy gluon masses up to 2.8 TeV can be probed with
data collected during 2012 and up to 5 TeV after the energy upgrade to
$\sqrt{s}=14$ TeV.
05/2012;
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ABSTRACT: A gluon resonance G of mass below 1 TeV could be the origin of the t\bar{t}
forward-backward asymmetry observed at the Tevatron provided that new decay
modes G->\bar{q}Q, with q a standard quark and Q its massive excitation, make G
broad enough. We consider all the different cases, with q the top, the bottom
or a light quark and dominant decay modes Q->Wq' or Q->Zq. We show that current
experimental searches are unable to probe the model, but that minimal
departures from these analyses can explore a large region of its parameter
space for the current LHC luminosity. This includes the challenging case with
the new quarks decaying mostly into light quark flavors. In some channels not
only the heavy quark but also the massive gluon can be reconstructed, which
would stablish the origin of the t\bar{t} asymmetry. Similar analyses can be
applied to more general models with new massive gluons and vectorlike quarks.
10/2011;
