scholarly journals Study of the anomalous cross-section lineshape of e+e−→DD¯ at ψ(3770) with an effective field theory

2013 ◽  
Vol 718 (4-5) ◽  
pp. 1369-1374 ◽  
Author(s):  
Guo-Ying Chen ◽  
Qiang Zhao
Keyword(s):  
Field Theory ◽  
Cross Section ◽  
Effective Field Theory ◽  
Effective Field

d + t → n + α fusion reaction in a model inspired by halo/cluster effective field theory

2017 ◽  
Vol 26 (12) ◽  
pp. 1750080 ◽  
Author(s):  
M. Moeini Arani ◽  
A. Koohi ◽  
S. Yarmahmoodi
Keyword(s):  
Field Theory ◽  
Cross Section ◽  
Effective Field Theory ◽  
Fusion Reaction ◽  
Coulomb Force ◽  
Effective Field ◽  
Low Energy ◽  
Coulomb Correction ◽  
Unknown Parameters ◽  
Energy Formula

We study the low-energy [Formula: see text] fusion reaction using a model inspired by the halo/cluster effective field theory (H/CEFT) formalism. For this purpose, we initially focus on the [Formula: see text] reaction without considering the Coulomb force in the incoming deuteron–triton system. In the next step, we insert the Coulomb correction in the [Formula: see text] cross-section. The cross-section results involve unknown parameters. So, finally, we fit the H/CEFT cross-section of the [Formula: see text] reaction to the experimental data and obtain the values of these unknown parameters.

scholarly journals ELECTROMAGNETIC PROCESSES IN χEFT

2009 ◽  
Vol 24 (11n13) ◽  
pp. 931-936 ◽  
Author(s):  
S. PASTORE ◽  
R. SCHIAVILLA ◽  
J. L. GOITY
Keyword(s):  
Field Theory ◽  
Circular Polarization ◽  
Cross Section ◽  
Effective Field Theory ◽  
Magnetic Moments ◽  
Effective Field ◽  
Polarization Parameter ◽  
Chiral Effective Field Theory ◽  
Electromagnetic Processes ◽  
Theory Framework

Nuclear electromagnetic currents derived in a chiral-effective-field-theory framework including explicit nucleons, Δ isobars, and pions up to N2LO, i.e. ignoring loop corrections, are used in a study of neutron radiative captures on protons and deuterons at thermal energies, and of A=2 and 3 nuclei magnetic moments. With the strengths of the Δ-excitation currents determined to reproduce the n-p cross section and isovector combination of the trinucleon magnetic moments, we find that the cross section and photon circular polarization parameter, measured respectively in n-d and [Formula: see text] processes, are significantly underpredicted by theory.

Radiative reactions in halo effective field theory

2016 ◽  
Vol 25 (05) ◽  
pp. 1641004 ◽  
Author(s):  
Gautam Rupak
Keyword(s):  
Field Theory ◽  
Cross Section ◽  
Effective Field Theory ◽  
Halo Nucleus ◽  
Radiative Capture ◽  
Effective Field ◽  
Valence Neutron ◽  
Halo Nuclei ◽  
Radiative Reaction ◽  
Model Independent

In this article we review the recent progress in radiative reaction calculations in halo effective field theory. We look at radiative capture and breakup processes that involve a halo nucleus with a single valence neutron or proton. Looking at [Formula: see text] [Formula: see text],[Formula: see text]n[Formula: see text] and related reactions, the dominant source of theoretical uncertainty in [Formula: see text]- and [Formula: see text]-wave halo nuclei reaction calculations is quantified in a model-independent framework. The analysis for neutron halos is extended to proton halo systems. The effective field theory results quantify which observable parameters of the strong interaction at low energy need to be determined more precisely for accurate cross-section calculations.

scholarly journals An introduction to NRQED

2015 ◽  
Vol 30 (26) ◽  
pp. 1550128 ◽  
Author(s):  
Gil Paz
Keyword(s):  
Field Theory ◽  
Electromagnetic Field ◽  
Cross Section ◽  
Effective Field Theory ◽  
Quantum Electrodynamics ◽  
Relativistic Quantum ◽  
Thomson Scattering ◽  
Effective Field ◽  
Low Energy ◽  
Sample Application

We present a pedagogical introduction to NRQED (non-relativistic quantum electrodynamics). NRQED is an effective field theory that describes the interaction of non-relativistic, possibly composite, spin- [Formula: see text] particle with the electromagnetic field. We explain in detail how the NRQED Lagrangian is constructed up to and including order [Formula: see text], where M is the mass of the spin- [Formula: see text] particle. As a sample application, we derive the Thomson scattering cross-section for the low energy scattering of a photon and a possibly composite spin- [Formula: see text] particle.

scholarly journals Resummation of non-global logarithms in cross sections with massive particles

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Marcel Balsiger ◽  
Thomas Becher ◽  
Andrea Ferroglia
Keyword(s):  
Field Theory ◽  
Cross Section ◽  
Cross Sections ◽  
Effective Field Theory ◽  
Top Quark ◽  
Parton Shower ◽  
Top Quarks ◽  
Effective Field ◽  
Group Evolution ◽  
Theory Framework

Abstract A factorization formalism for jet processes involving massive colored particles such as the top quark is developed, extending earlier results for the massless case. The factorization of soft emissions from the underlying hard process is implemented in an effective field theory framework, which forms the basis for the resummation of large logarithms. The renormalization group evolution giving rise to non-global logarithms is implemented into a parton shower code in the large-Nc limit. After a comparison of the massive and massless radiation patterns, the cross section for $$ t\overline{t} $$ t t ¯ production with a veto on additional central jet activity is computed, taking into account radiation both from the production and the decay of the top quarks. The resummation of the leading logarithms leads to an improved description of ATLAS measurements at $$ \sqrt{s} $$ s = 7 TeV.

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