Low-energy photon-photon collisions to two-loop order

2008 ◽  
pp. 137-151
Author(s):  
J. Gasser
Keyword(s):  
Low Energy ◽  
Loop Order ◽  
Energy Photon

scholarly journals Low-energy photon-photon collisions to two-loop order

1994 ◽  
Vol 423 (1) ◽  
pp. 80-122 ◽  
Author(s):  
S. Bellucci ◽  
J. Gasser ◽  
M.E. Sainio
Keyword(s):  
Low Energy ◽  
Loop Order ◽  
Energy Photon

scholarly journals The low-energy effective theory of axions and ALPs

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Martin Bauer ◽  
Matthias Neubert ◽  
Sophie Renner ◽  
Marvin Schnubel ◽  
Andrea Thamm
Keyword(s):  
High Energy ◽  
New Physics ◽  
Mass Scale ◽  
Low Energy ◽  
Effective Theory ◽  
Loop Order ◽  
Flavor Changing ◽  
Effective Lagrangian ◽  
Anomalous Dimensions ◽  
Pseudoscalar Mesons

Abstract Axions and axion-like particles (ALPs) are well-motivated low-energy relics of high-energy extensions of the Standard Model, which interact with the known particles through higher-dimensional operators suppressed by the mass scale Λ of the new-physics sector. Starting from the most general dimension-5 interactions, we discuss in detail the evolution of the ALP couplings from the new-physics scale to energies at and below the scale of electroweak symmetry breaking. We derive the relevant anomalous dimensions at two-loop order in gauge couplings and one-loop order in Yukawa interactions, carefully considering the treatment of a redundant operator involving an ALP coupling to the Higgs current. We account for one-loop (and partially two-loop) matching contributions at the weak scale, including in particular flavor-changing effects. The relations between different equivalent forms of the effective Lagrangian are discussed in detail. We also construct the effective chiral Lagrangian for an ALP interacting with photons and light pseudoscalar mesons, pointing out important differences with the corresponding Lagrangian for the QCD axion.

EDR2 film dosimetry for IMRT verification using low-energy photon filters

2004 ◽  
Vol 31 (7) ◽  
pp. 1960-1963 ◽  
Author(s):  
Inhwan Jason Yeo ◽  
Akbar Beiki-Ardakani ◽  
Young-bin Cho ◽  
Mostafa Heydarian ◽  
Ting Zhang ◽  
...  
Keyword(s):  
Low Energy ◽  
Film Dosimetry ◽  
Energy Photon ◽  
Edr2 Film ◽  
Imrt Verification

Can a low-energy photon beam be suitable for the treatment of cervical malignancies? A dosimetric analysis

2020 ◽  
Vol 3 (2) ◽  
pp. 55
Author(s):  
Manindra Bhushan ◽  
Deepak Tripathi ◽  
Lalit Kumar ◽  
RahulLal Chowdhary ◽  
Anjali Kakria ◽  
...  
Keyword(s):  
Low Energy ◽  
Photon Beam ◽  
Energy Photon ◽  
Dosimetric Analysis

Simple coincidence technique for cosmic-ray intensity exploration via low-energy photon detection

2019 ◽  
Vol 151 ◽  
pp. 157-165
Author(s):  
J. Knezevic ◽  
D. Mrdja ◽  
K. Bikit ◽  
I. Bikit ◽  
J. Hansman ◽  
...  
Keyword(s):  
Cosmic Ray ◽  
Low Energy ◽  
Energy Photon ◽  
Photon Detection ◽  
Coincidence Technique ◽  
Cosmic Ray Intensity
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