scholarly journals Radiative corrections to τ→π(K)ντ[γ] : A reliable new physics test

2021 ◽  
Vol 104 (9) ◽  
Author(s):  
M. A. Arroyo-Ureña ◽  
G. Hernández-Tomé ◽  
G. López-Castro ◽  
P. Roig ◽  
I. Rosell
Keyword(s):  
New Physics ◽  
Radiative Corrections

scholarly journals QED RADIATIVE CORRECTIONS TO THE DECAY π0→e+e−

1993 ◽  
Vol 08 (18) ◽  
pp. 1691-1700 ◽  
Author(s):  
GEORGE TRIANTAPHYLLOU
Keyword(s):  
Perturbation Theory ◽  
Decay Rate ◽  
Invariant Mass ◽  
New Physics ◽  
Radiative Corrections ◽  
First Order ◽  
Recent Interest ◽  
Electron Positron ◽  
Electron Positron Pair ◽  
First Order Perturbation

In view of the recent interest in the decays of mesons into a pair of light leptons, a computation of the QED radiative corrections to the decay of π0 into an electron-positron pair is presented here. The analysis is based on the soft-photon resummation method, which, unlike first-order perturbation theory, allows for very strict invariant-mass cuts on the final electrons. When combined with the theoretical estimates for the non-radiatively corrected decay rate, the results of the present paper could help to determine if new physics affect this decay.

scholarly journals HOW MAGNETIC IS THE NEUTRINO?

2007 ◽  
Vol 22 (27) ◽  
pp. 4891-4899 ◽  
Author(s):  
N. F. BELL
Keyword(s):  
Neutrino Mass ◽  
Magnetic Moment ◽  
Magnetic Moments ◽  
New Physics ◽  
Upper Bounds ◽  
Radiative Corrections ◽  
Neutrino Magnetic Moment ◽  
Majorana Neutrinos ◽  
Model Independent ◽  
Moment Bounds

The existence of a neutrino magnetic moment implies contributions to the neutrino mass via radiative corrections. We derive model-independent "naturalness" upper bounds on the magnetic moments of Dirac and Majorana neutrinos, generated by physics above the electroweak scale. For Dirac neutrinos, the bound is several orders of magnitude more stringent than present experimental limits. However, for Majorana neutrinos the magnetic moment bounds are weaker than present experimental limits if μν is generated by new physics at ~ 1 TeV , and surpass current experimental sensitivity only for new physics scales > 10 – 100 TeV . The discovery of a neutrino magnetic moment near present limits would thus signify that neutrinos are Majorana particles.

scholarly journals Flavor-dependent radiative corrections in coherent elastic neutrino-nucleus scattering

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Oleksandr Tomalak ◽  
Pedro Machado ◽  
Vishvas Pandey ◽  
Ryan Plestid
Keyword(s):  
Standard Model ◽  
Cross Section ◽  
Cross Sections ◽  
Nuclear Physics ◽  
Heavy Particle ◽  
New Physics ◽  
Effective Field ◽  
Radiative Corrections ◽  
The Standard Model ◽  
Nucleus Scattering

Abstract We calculate coherent elastic neutrino-nucleus scattering cross sections on spin-0 nuclei (e.g. 40Ar and 28Si) at energies below 100 MeV within the Standard Model and account for all effects of permille size. We provide a complete error budget including uncertainties at nuclear, nucleon, hadronic, and quark levels separately as well as perturbative error. Our calculation starts from the four-fermion effective field theory to explicitly separate heavy-particle mediated corrections (which are absorbed by Wilson coefficients) from light-particle contributions. Electrons and muons running in loops introduce a non- trivial dependence on the momentum transfer due to their relatively light masses. These same loops, and those mediated by tau leptons, break the flavor universality because of mass-dependent electromagnetic radiative corrections. Nuclear physics uncertainties significantly cancel in flavor asymmetries resulting in subpercent relative errors. We find that for low neutrino energies, the cross section can be predicted with a relative precision that is competitive with neutrino-electron scattering. We highlight potentially useful applications of such a precise cross section prediction ranging from precision tests of the Standard Model, to searches for new physics and to the monitoring of nuclear reactors.

scholarly journals One-loop radiative corrections to e+e− → Zh0/H0A0 in the Inert Higgs Doublet Model

2021 ◽  
Vol 2021 (5) ◽  
Author(s):  
Hamza Abouabid ◽  
Abdesslam Arhrib ◽  
Rachid Benbrik ◽  
Jaouad El Falaki ◽  
Bin Gong ◽  
...  
Keyword(s):  
Production Rate ◽  
Parameter Space ◽  
Feynman Diagram ◽  
Higgs Doublet ◽  
New Physics ◽  
Radiative Corrections ◽  
Electron Positron ◽  
Doublet Model ◽  
The One ◽  
Real Emission

Abstract We compute the full one-loop radiative corrections (including both weak and QED corrections) for two processes e+e− → Zh0, H0A0 in the Inert Higgs Doublet model (IHDM). Up to O(αw) and O(αem) order, we use FeynArts/FormCalc to compute the one-loop virtual corrections and Feynman Diagram Calculation (FDC) to evaluate the real emission, respectively. Being equipped with these computing tools, we investigate radiative corrections of new physics for five scenarios with three typical collision energies of future electron-positron colliders: 250 GeV, 500 GeV, and 1000 GeV. By scanning the parameter space of IHDM, we identify the allowed regions which are consistent with constraints and bounds, from both theoretical and experimental sides. We find that the radiative corrections of the IHDM to e+e− → Zh0 can be sizeable and are within the detection potentials of future Higgs factories. We also find that the new physics of IHDM could also be directly detected by observing the process e+e− → H0A0 which could have large enough production rate. We propose six benchmark points and examine their salient features which can serve as physics targets for future electron-positron colliders, such as CEPC/CLIC/FCC-ee/ILC as well as for LHC.

scholarly journals IMPACT OF THE BOUNDS ON HIGGS MASS AND mW ON EFFECTIVE THEORIES

2000 ◽  
Vol 15 (21) ◽  
pp. 1377-1384 ◽  
Author(s):  
J. L. DIAZ-CRUZ ◽  
J. M. HERNANDEZ ◽  
J. J. TOSCANO
Keyword(s):  
Higgs Mass ◽  
New Physics ◽  
Precise Determination ◽  
Lagrangian Approach ◽  
Radiative Corrections ◽  
Effective Parameters ◽  
Effective Lagrangian ◽  
Effective Theories

We study the inter-relations that exist between the present experimental bounds on the Higgs mass, as obtained from radiative corrections to mW, and the effective parameters, αi and Λ. We find that the SM bounds on mH, arising from a precise determination of the W mass, can be substantially modified by the presence of dimension-six operators which appear in the linear realization of the effective Lagrangian approach. A Higgs mass as heavy as 700 GeV can be allowed for scales of new physics of the order of 1 TeV.

RADIATIVE CORRECTIONS AND UNITARITY BOUNDS ON THE HIGGS BOSON MASS

1991 ◽  
Vol 06 (13) ◽  
pp. 1195-1198 ◽  
Author(s):  
E. LENDVAI ◽  
G. PÓCSIK ◽  
T. TORMA
Keyword(s):  
Higgs Boson ◽  
Upper Bound ◽  
Higgs Mass ◽  
New Physics ◽  
Boson Mass ◽  
Higgs Boson Mass ◽  
Radiative Corrections ◽  
Standard Model Higgs Boson ◽  
Unitarity Bound ◽  
The Standard Model

The influence of radiative corrections is examined as regards the relation between the unitarity bound on the standard model Higgs boson mass and the scale of new physics, Λ, where perturbative unitarity is violated. For a fixed Λ, radiative corrections increase the upper bound on the Higgs mass. The shift is about 270 GeV at Λ=1 TeV and 80 (40) GeV at Λ=2 (5) TeV .

scholarly journals POLARIZED MØLLER SCATTERING ASYMMETRIES

2000 ◽  
Vol 15 (16) ◽  
pp. 2365-2375 ◽  
Author(s):  
ANDRZEJ CZARNECKI ◽  
WILLIAM J. MARCIANO
Keyword(s):  
Electron Beams ◽  
New Physics ◽  
Radiative Corrections ◽  
Fixed Target ◽  
Moller Scattering ◽  
Electroweak Radiative Corrections

The utility of polarized electron beams for precision electroweak studies is described. Parity violating Møller scattering asymmetries in e-e-→e-e- are discussed. Effects of electroweak radiative corrections and the running sin2θW(Q2) are reviewed. The sensitivity of E158 (a fixed target e-e- experiment at SLAC) and future e-e- collider studies to "new physics" is briefly outlined.

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