Search results for: O. Catà

Items from 1 to 9 out of 9 results

article

Standard model extended by a heavy singlet: Linear vs. nonlinear EFT

G. Buchalla, O. Catà, A. Celis, C. Krause

Nuclear Physics B > 2017 > 917 > C > 209-233

We consider the Standard Model extended by a heavy scalar singlet in different regions of parameter space and construct the appropriate low-energy effective field theories up to first nontrivial order. This top-down exercise in effective field theory is meant primarily to illustrate with a simple example the systematics of the linear and nonlinear electroweak effective Lagrangians and to clarify the...

article

Fitting Higgs data with nonlinear effective theory

G. Buchalla, O. Catà, A. Celis, C. Krause

The European Physical Journal C > 2016 > 76 > 5 > 1-13

In a recent paper we showed that the electroweak chiral Lagrangian at leading order is equivalent to the conventional $$\kappa $$ κ formalism used by ATLAS and CMS to test Higgs anomalous couplings. Here we apply this fact to fit the latest Higgs data. The new aspect of our analysis is a systematic interpretation of the fit parameters within an EFT. Concentrating on the processes of Higgs...

article

Note on anomalous Higgs-boson couplings in effective field theory

G. Buchalla, O. Catà, A. Celis, C. Krause

Physics Letters B > 2015 > 750 > C > 298-301

We propose a parametrization of anomalous Higgs-boson couplings that is both systematic and practical. It is based on the electroweak chiral Lagrangian, including a light Higgs boson, as the effective field theory (EFT) at the electroweak scale v. This is the appropriate framework for the case of sizeable deviations in the Higgs couplings of order 10% from the Standard Model, considered to be parametrically...

article

Effective field theory analysis of new physics in e ⁺ e ⁻→W ⁺ W ⁻ at a linear collider

G. Buchalla, O. Catà, R. Rahn, M. Schlaffer

The European Physical Journal C > 2013 > 73 > 10 > 1-17

We analyze new-physics contributions to e ⁺ e ⁻→W ⁺ W ⁻ at the TeV energy scale, employing an effective field theory framework. A complete basis of next-to-leading-order operators in the standard-model effective Lagrangian is used, both for the nonlinear and the linear realization of the electroweak sector. The elimination of redundant operators via equations-of-motion constraints is discussed in...

article

Issues in Determining αs from Hadronic τ Decay and Electroproduction Data

D. Boito, O. Catà, M. Golterman, M. Jamin, more

Nuclear Physics B (Proceedings Supplements) > 2012 > 225-227 > Complete > 153-156

We discuss some key issues associated with duality-violating and non-perturbative OPE contributions to the theoretical representations of light quark current-current two-point functions and relevant to precision determinations of αs from hadronic τ decay and electroproduction cross-section data. We demonstrate that analyses with an explicit representation of duality-violating effects are required...

article

αs from τ decays revisited

D.R. Boito, O. Catà, M. Golterman, M. Jamin, more

Nuclear Physics B (Proceedings Supplements) > 2012 > 225-227 > Complete > 157-160

Being a determination at low energies, the analysis of hadronic τ decay data provides a rather precise determination of the strong coupling αs after evolving the result to MZ. At such a level of precision, even small non-perturbative effects become relevant for the central value and error. While those effects had been taken into account in the framework of the operator product expansion, contributions...

article

Erratum to: K ⁺→π ⁺ π ⁰ e ⁺ e ⁻: a novel short-distance probe

L. Cappiello, O. Catà, G. D’Ambrosio, Dao-Neng Gao

The European Physical Journal C > 2012 > 72 > 11 > 1-1

article

K ⁺→π ⁺ π ⁰ e ⁺ e ⁻: a novel short-distance probe

L. Cappiello, O. Catà, G. D’Ambrosio, Dao-Neng Gao

The European Physical Journal C > 2012 > 72 > 1 > 1-16

We study the decay K ⁺→π ⁺ π ⁰ e ⁺ e ⁻, currently under analysis by the NA62 Collaboration at CERN. In particular, we provide a detailed analysis of the Dalitz plot for the long-distance, γ ^∗-mediated, contributions (Bremsstrahlung, direct emission and its interference). We also examine a set of asymmetries to isolate genuine short-distance effects. While we show that charge asymmetries are not required...

article

Duality violations in τ hadronic spectral moments

D.R. Boito, O. Catà, M. Golterman, M. Jamin, more

Nuclear Physics B (Proceedings Supplements) > 2011 > 218 > 1 > 104-109

Evidence is presented for the necessity of including duality violations in a consistent description of spectral function moments employed in the precision determination of αs from τ decay. A physically motivated ansatz for duality violations in the spectral functions enables us to perform fits to spectral moments employing both pinched and unpinched weights. We describe our analysis strategy and provide...

INFONA - science communication portal

Search results for: O. Catà

Standard model extended by a heavy singlet: Linear vs. nonlinear EFT

Fitting Higgs data with nonlinear effective theory

Note on anomalous Higgs-boson couplings in effective field theory

Effective field theory analysis of new physics in e ⁺ e ⁻→W ⁺ W ⁻ at a linear collider

Issues in Determining αs from Hadronic τ Decay and Electroproduction Data

αs from τ decays revisited

Erratum to: K ⁺→π ⁺ π ⁰ e ⁺ e ⁻: a novel short-distance probe

K ⁺→π ⁺ π ⁰ e ⁺ e ⁻: a novel short-distance probe

Duality violations in τ hadronic spectral moments

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