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 Three-body systems in physics of cold atoms and halo nuclei

2016 ◽  
Vol 25 (05) ◽  
pp. 1641003 ◽  
Author(s):  
Chen Ji
Keyword(s):  
Field Theory ◽  
Effective Field Theory ◽  
Cold Atoms ◽  
Effective Field ◽  
Low Energy ◽  
Halo Nuclei ◽  
Particle Interactions ◽  
Body Contact ◽  
Low Energies ◽  
Three Body

Few-body systems, such as cold atoms and halo nuclei, share universal features at low energies, which are insensitive to the underlying inter-particle interactions at short ranges. These low-energy properties can be investigated in the framework of effective field theory with two-body and three-body contact interactions. I review the effective-field-theory studies of universal physics in three-body systems, focusing on the application in cold atoms and halo nuclei.

scholarly journals Effective field theory for halo nuclei: shallow -wave states

2002 ◽  
Vol 712 (1-2) ◽  
pp. 37-58 ◽  
Author(s):  
C.A. Bertulani ◽  
H.-W. Hammer ◽  
U. van Kolck
Keyword(s):  
Field Theory ◽  
Effective Field Theory ◽  
Effective Field ◽  
Halo Nuclei ◽  
Wave States

scholarly journals Long-lived heavy neutral leptons at the LHC: four-fermion single-NR operators

2022 ◽  
Vol 2022 (1) ◽  
Author(s):  
Rebeca Beltrán ◽  
Giovanna Cottin ◽  
Juan Carlos Helo ◽  
Martin Hirsch ◽  
Arsenii Titov ◽  
...  
Keyword(s):  
Field Theory ◽  
Standard Model ◽  
Effective Field Theory ◽  
New Physics ◽  
Effective Field ◽  
High Luminosity ◽  
The Past ◽  
The Standard Model ◽  
Model Independent

Abstract Interest in searches for heavy neutral leptons (HNLs) at the LHC has increased considerably in the past few years. In the minimal scenario, HNLs are produced and decay via their mixing with active neutrinos in the Standard Model (SM) spectrum. However, many SM extensions with HNLs have been discussed in the literature, which sometimes change expectations for LHC sensitivities drastically. In the NRSMEFT, one extends the SM effective field theory with operators including SM singlet fermions, which allows to study HNL phenomenology in a “model independent” way. In this paper, we study the sensitivity of ATLAS to HNLs in the NRSMEFT for four-fermion operators with a single HNL. These operators might dominate both production and decay of HNLs, and we find that new physics scales in excess of 20 TeV could be probed at the high-luminosity LHC.

scholarly journals Z lepton flavour violation as a probe for new physics at future $$e^+e^-$$ colliders

2021 ◽  
Vol 81 (12) ◽  
Author(s):  
Lorenzo Calibbi ◽  
Xabier Marcano ◽  
Joydeep Roy
Keyword(s):  
Field Theory ◽  
Effective Field Theory ◽  
New Physics ◽  
Effective Field ◽  
Low Energy ◽  
The Standard Model ◽  
Discovery Potential ◽  
Flavour Violation ◽  
Model Independent ◽  
Lepton Flavour

AbstractIn this work we assess the potential of discovering new physics by searching for lepton-flavour-violating (LFV) decays of the Z boson, $$Z\rightarrow \ell _i \ell _j$$ Z → ℓ i ℓ j , at the proposed circular $$e^+e^-$$ e + e - colliders CEPC and FCC-ee. Both projects plan to run at the Z-pole as a “Tera Z factory”, i.e., collecting $${\mathcal {O}}\left( 10^{12} \right) $$ O 10 12 Z decays. In order to discuss the discovery potential in a model-independent way, we revisit the LFV Z decays in the context of the Standard Model effective field theory and study the indirect constraints from LFV $$\mu $$ μ and $$\tau $$ τ decays on the operators that can induce $$Z\rightarrow \ell _i \ell _j$$ Z → ℓ i ℓ j . We find that, while the $$Z\rightarrow \mu e$$ Z → μ e rates are beyond the expected sensitivities, a Tera Z factory is promising for $$Z\rightarrow \tau \ell $$ Z → τ ℓ decays, probing New Physics at the same level of future low-energy LFV observables.

scholarly journals Effective field theory calculation of nd radiative capture at thermal energies

2006 ◽  
Vol 643 (5) ◽  
pp. 263-267 ◽  
Author(s):  
H. Sadeghi ◽  
S. Bayegan ◽  
Harald W. Grießhammer
Keyword(s):  
Field Theory ◽  
Effective Field Theory ◽  
Radiative Capture ◽  
Effective Field ◽  
Theory Calculation

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.

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