Trilepton signals: the golden channel for seesaw searches at LHC (2009)
Del Aguila, F., Aguilar-Saavedra, J. A., De Blas, J.
The comparison of samples with different number of charged leptons shows that trilepton signals are the most significant ones for seesaw mediators. As previously pointed out, this is indeed the case...
Identifying top partners at LHC (2009)
We systematically study the possible signals at LHC of new vector-like quarks mainly coupled to the third generation. We consider heavy quarks T, B, X, Y of charges 2/3, -1/3, 5/3 and -4/3,...
Heavy lepton pair production at LHC: model discrimination with multi-lepton signals (2009)
If new leptons exist close to the electroweak scale, they can be produced in pairs at LHC through standard or new interactions. We study the production of heavy lepton pairs in SM extensions with:...
A minimal set of top-Higgs anomalous couplings (2009)
We use the equations of motion to simplify the general form of fermion-fermion-Higgs interactions generated by dimension-six gauge-invariant effective operators. After removing redundant operators it...
Expected Performance of the ATLAS Experiment - Detector, Trigger and Physics (2008)
Abat, E., Abbott, B., Abdallah, J., Abdelalim, A. A., Abdesselam, A., ...
A detailed study is presented of the expected performance of the ATLAS detector. The reconstruction of tracks, leptons, photons, missing energy and jets is investigated, together with the performance...
A minimal set of top anomalous couplings (2008)
We simplify the general form of the fermion-fermion-gauge boson interactions generated by dimension-six gauge-invariant effective operators by using the equations of motion to remove redundant...
Electroweak scale seesaw and heavy Dirac neutrino signals at LHC (2008)
Del Aguila, F., Aguilar-Saavedra, J. A.
Models of type I seesaw can be implemented at the electroweak scale in a natural way provided that the heavy neutrino singlets are quasi-Dirac particles. In such case, their contribution to light...
Distinguishing seesaw models at LHC with multi-lepton signals (2008)
Del Aguila, F., Aguilar-Saavedra, J. A.
We investigate the LHC discovery potential for electroweak scale heavy neutrino singlets (seesaw I), scalar triplets (seesaw II) and fermion triplets (seesaw III). For seesaw I we consider a heavy...
Electroweak constraints on see-saw messengers and their implications for LHC (2008)
Del Aguila, F., Aguilar-Saavedra, J. A., De Blas, J., Perez-Victoria, M.
We review the present electroweak precision data constraints on the mediators of the three types of see-saw mechanisms. Except in the see-saw mechanism of type I, with the heavy neutrino singlets...
Single top quark production at LHC with anomalous Wtb couplings (2008)
We investigate single top production in the presence of anomalous Wtb couplings. We explicitly show that, if these couplings arise from gauge invariant effective operators, the only relevant...
Collider aspects of flavour physics at high Q (2008)
Lari, T., Pape, L., Porod, W., Aguilar-Saavedra, J. A., Del Aguila, F., Allanach, B. C., ...
This review presents flavour related issues in the production and decays of heavy states at LHC, both from the experimental side and from the theoretical side. We review top quark physics and discuss...
Collider aspects of flavour physics at high Q (2008)
Lari, T., Pape, L., Porod, W., Aguilar-Saavedra, J. A., Del Aguila, F., Allanach, B. C., ...
This review presents flavour related issues in the production and decays of heavy states at LHC, both from the experimental side and from the theoretical side. We review top quark physics and discuss...
Like-sign dilepton signals from a leptophobic Z' boson (2007)
Del Aguila, F., Aguilar-Saavedra, J. A.
A new leptophobic neutral gauge boson Z' with small mixing to the Z can have a mass as light as M_Z' ~ 350 GeV, and still have escaped detection at LEP and Tevatron. Such a Z' boson can be derived...
ATLAS sensitivity to Wtb anomalous couplings in top quark decays (2007)
Aguilar-Saavedra, J. A., Carvalho, J., Castro, N., Onofre, A., Veloso, F.
We study the sensitivity of the ATLAS experiment to Wtb anomalous couplings in top pair production with semileptonic decay, pp -> t tbar -> W+ b W- bbar, with one of the W bosons decaying...
Heavy neutrino signals at large hadron colliders (2007)
Del Aguila, F., Aguilar-Saavedra, J. A., Pittau, R.
We study the LHC discovery potential for heavy Majorana neutrino singlets in the process pp -> W+ -> l+ N -> l+ l+ jj (l=e,mu) plus its charge conjugate. With a fast detector simulation we show that...
Neutrino physics at large colliders (2006)
Del Aguila, F., Aguilar-Saavedra, J. A., Pittau, R.
Large colliders are not sensitive to light neutrino masses and character, but they can produce new heavy neutrinos, allowing also for the determination of their Dirac or Majorana nature. We review...
Probing anomalous Wtb couplings in top pair decays (2006)
Aguilar-Saavedra, J. A., Carvalho, J., Castro, N., Onofre, A., Veloso, F.
We investigate several quantities, defined in the decays of top quark pairs, which can be used to explore non-standard Wtb interactions. Two new angular asymmetries are introduced in the leptonic...
Supersymmetry parameter analysis: SPA convention and project (2006)
Allanach, B. C., King, S. F., Blair, G.A., Kraml, S., Kim, C. S., Bagger, J. A., ...
High-precision analyses of supersymmetry parameters aim at reconstructing the fundamental supersymmetric theory and its breaking mechanism. A well defined theoretical framework is needed when...
Supersymmetry parameter analysis: SPA convention and project (2006)
Allanach, B. C., King, S. F., Blair, G.A., Kraml, S., Kim, C. S., Bagger, J. A., ...
High-precision analyses of supersymmetry parameters aim at reconstructing the fundamental supersymmetric theory and its breaking mechanism. A well defined theoretical framework is needed when...
Light Higgs boson discovery from fermion mixing (2006)
We evaluate the LHC discovery potential for a light Higgs boson in t tbar H (-> l nu b bbar b bbar jj) production, within the Standard Model and if a new Q=2/3 quark singlet T with a moderate mass...
Supersymmetry Parameter Analysis: SPA Convention and Project (2006)
Aguilar-Saavedra, J. A., Ali, A., Allanach, B. C., Arnowitt, R., Baer, H. A., Bagger, J. A., ...
High-precision analyses of supersymmetry parameters aim at reconstructing the fundamental supersymmetric theory and its breaking mechanism. A well defined theoretical framework is needed when...
Supersymmetry Parameter Analysis : SPA Convention and Project (2005)
Aguilar-Saavedra, J A, Ali, A, Allanach, Benjamin C, Arnowitt, R, Baer, H A, Bagger, J A, ...
High-precision analyses of supersymmetry parameters aim at reconstructing the fundamental supersymmetric theory and its breaking mechanism. A well defined theoretical framework is needed when...
Supersymmetry Parameter Analysis: SPA Convention and Project (2005)
Aguilar-Saavedra, J. A., Ali, A., Allanach, B. C., Arnowitt, R., Baer, H. A., Bagger, J. A., ...
High-precision analyses of supersymmetry parameters aim at reconstructing the fundamental supersymmetric theory and its breaking mechanism. A well defined theoretical framework is needed when...
Pair production of heavy Q=2/3 singlets at LHC (2005)
We examine the LHC discovery potential for new Q=2/3 quark singlets T in the process gg,qq -> T Tbar -> W+ b W- bbar, with one W boson decaying hadronically and the other one leptonically. A...
l W nu production at CLIC: a window to TeV scale non-decoupled neutrinos (2005)
Del Aguila, F., Aguilar-Saavedra, J. A.
We discuss single heavy neutrino production e+ e- -> N nu -> l W nu, l = e, mu, tau, at a future high energy collider like CLIC, with a centre of mass energy of 3 TeV. This process could allow to...
The size of chi = arg (-Vts Vtb* Vcs* Vcb) and physics beyond the Standard Model (2004)
Aguilar-Saavedra, J A, Botella, F J, Branco, Gustavo Castello, Nebot, M
We analyse the allowed range of values of chi, both in the Standard Model and in models with New Physics, pointing out that a relatively large value of chi, e.g. of order lambda, is only possible in...
The size of chi = arg (-Vts Vtb* Vcs* Vcb) and physics beyond the Standard Model (2004)
Aguilar-Saavedra, J A, Botella, F J, Branco, Gustavo Castello, Nebot, M
We analyse the allowed range of values of chi, both in the Standard Model and in models with New Physics, pointing out that a relatively large value of chi, e.g. of order lambda, is only possible in...
Neutrino Masses, Mixing and New Physics Effects (2003)
Aguilar-Saavedra, J A, Branco, Gustavo Castello, Joaquim, F R
We introduce a parametrization of the effects of radiative corrections from new physics on the charged lepton and neutrino mass matrices, studying how several relevant quantities describing the...
Neutrino Masses, Mixing and New Physics Effects (2003)
Aguilar-Saavedra, J A, Branco, Gustavo Castello, Joaquim, F R
We introduce a parametrization of the effects of radiative corrections from new physics on the charged lepton and neutrino mass matrices, studying how several relevant quantities describing the...
Precise determination of the Wtb couplings at LHC (2002)
Del Aguila, F., Aguilar-Saavedra, J. A.
Top pair production at LHC is the ideal place to search for nonstandard Wtb couplings in t -> W b -> l nu b decays. The lb forward-backward asymmetry in the W rest frame is very sensitive to...
Probing top flavour-changing neutral scalar couplings at the CERN LHC (2000)
Aguilar-Saavedra, J A, Branco, Gustavo Castello
Top decays into a light Higgs boson and an up or charm quark can reach detectable levels in Standard Model extensions with two Higgs doublets or with new exotic quarks, and in the Minimal...
Probing top flavour-changing neutral scalar couplings at the CERN LHC (2000)
Aguilar-Saavedra, J. A., Branco, G. C.
Top decays into a light Higgs boson and an up or charm quark can reach detectable levels in Standard Model extensions with two Higgs doublets or with new exotic quarks, and in the Minimal...
Multilepton production via top flavour-changing neutral couplings at the CERN LHC (1999)
Del Águila, F, Aguilar-Saavedra, J A
Zt and gamma t production with Z -> l+ l- and t -> Wb -> l nu b provides the best determination of top flavour-changing neutral couplings at the LHC. The bounds on tc couplings eventually derived...
Aguilar-Saavedra, J. A., Alcaraz, J., Ali, Ahmed, Ambrosanio, S., Andreazza, A., Andruszkow, J., ...
The TESLA Technical Design Report Part III: Physics at an e+e- Linear Collider