scholarly journals Virtual photon scattering at high energies as a probe of the short distance Pomeron

1997 ◽  
Vol 56 (11) ◽  
pp. 6957-6979 ◽  
Author(s):  
S. J. Brodsky ◽  
F. Hautmann ◽  
D. E. Soper
Keyword(s):  
Short Distance ◽  
Virtual Photon ◽  
Photon Scattering ◽  
High Energies

The photonuclear cross section at high energies as determined from the nuclear interaction of muons

1968 ◽  
Vol 46 (10) ◽  
pp. S373-S376 ◽  
Author(s):  
R. J. W. Hodgson ◽  
H. S. Murdoch ◽  
H. D. Rathgeber
Keyword(s):  
Form Factor ◽  
Cross Section ◽  
Virtual Photon ◽  
Cosmic Ray ◽  
Nuclear Interaction ◽  
High Energy ◽  
Photon Spectrum ◽  
High Energies ◽  
Deep Underground ◽  
Energy Dependent

Information about the photonuclear cross section σγ, at high energy can be obtained from muon interaction experiments by considering the virtual photon spectrum of the muons. Previous attempts to fit a virtual photon spectrum and form factor to the following experiments are discussed: (1) interaction of machine-produced muons at 2.5 and 5 GeV; (2) interaction of cosmic-ray muons at high energy; (3) the intensity–depth relation of cosmic-ray muons deep underground. It is shown that previous proposals to fit one or more of these experiments are not consistent with all the experimental evidence, particularly in relation to the form factor. It is demonstrated that σγ is energy-dependent above 1 GeV and, with due allowance for this, a form factor may be found which is consistent with the various experiments.

scholarly journals BFKL PHYSICS IN JET PRODUCTION AT e+e- COLLIDERS

2001 ◽  
Vol 16 (supp01a) ◽  
pp. 209-211
Author(s):  
LYNNE H. ORR ◽  
W. J. STIRLING
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Method ◽  
Cross Section ◽  
Virtual Photon ◽  
Bfkl Equation ◽  
Photon Scattering ◽  
Kinematic Constraints ◽  
Large Rapidity ◽  
Electron Positron ◽  
Electron Positron Pair

Virtual photon scattering in e+e- collisions can result with the electron-positron pair at large rapidity separation with hadronic activity in between. The BFKL equation resums large logarithms that dominate the cross section for this process. We report here on a Monte Carlo method for solving the BFKL equation that allows kinematic constraints to be taken into account and show results for e+e- collisions.

scholarly journals Proposal to Build an Electron-Photon Facility at NAL and to Measure Photon Scattering at High Energies

1971 ◽  
Author(s):  
D.E. Dorfan ◽  
S.M. Flatte ◽  
C.A. Heusch ◽  
G. Luxton ◽  
C. del Papa ◽  
...  
Keyword(s):  
Photon Scattering ◽  
High Energies ◽  
Electron Photon

scholarly journals VIRTUAL PHOTON–PHOTON SCATTERING

2014 ◽  
Vol 35 ◽  
pp. 1460400 ◽  
Author(s):  
MARTIN HOFERICHTER ◽  
GILBERTO COLANGELO ◽  
MASSIMILIANO PROCURA ◽  
PETER STOFFER
Keyword(s):  
Light Scattering ◽  
Cross Section ◽  
Magnetic Moment ◽  
Anomalous Magnetic Moment ◽  
Virtual Photon ◽  
Vacuum Polarization ◽  
Lorentz Invariance ◽  
Analytic Structure ◽  
Photon Scattering ◽  
Virtual Photons

Based on analyticity, unitarity, and Lorentz invariance the contribution from hadronic vacuum polarization to the anomalous magnetic moment of the muon is directly related to the cross section of e+e− → hadrons . We review the main difficulties that impede such an approach for light-by-light scattering and identify the required ingredients from experiment. Amongst those, the most critical one is the scattering of two virtual photons into meson pairs. We analyze the analytic structure of the process γ*γ* → ππ and show that the usual Muskhelishvili–Omnès representation can be amended in such a way as to remain valid even in the presence of anomalous thresholds.

scholarly journals Charm physics confronts high-pT lepton tails

2020 ◽  
Vol 2020 (11) ◽  
Author(s):  
Javier Fuentes-Martín ◽  
Admir Greljo ◽  
Jorge Martin Camalich ◽  
José David Ruiz-Alvarez
Keyword(s):  
Effective Field Theory ◽  
Short Distance ◽  
Neutral Current ◽  
New Physics ◽  
Charm Physics ◽  
Effective Field ◽  
Charmed Meson ◽  
Charm Decays ◽  
High Energies ◽  
The Standard Model

Abstract We present a systematic survey of possible short-distance new-physics effects in (semi)leptonic charged- and neutral-current charmed meson decays. Using the Standard Model Effective Field Theory (SMEFT) to analyze the most relevant experimental data at low and high energies, we demonstrate a striking complementarity between charm decays and high invariant mass lepton tails at the LHC. Interestingly enough, high-pT Drell-Yan data offer competitive constraints on most new physics scenarios. Furthermore, the full set of correlated constraints from K, π and τ decays imposed by SU(2)L gauge invariance is considered. The bounds from D(s) decays, high-pT lepton tails and SU(2)L relations chart the space of the SMEFT affecting semi(leptonic) charm flavor transitions.

Virtual photon scattering at subwavelength sized tips

1996 ◽  
Vol 63 (5) ◽  
pp. 421-425 ◽  
Author(s):  
J. P. Fillard ◽  
M. Castagné ◽  
M. Benfedda ◽  
S. Lahimer ◽  
H. U. Danzebrink
Keyword(s):  
Virtual Photon ◽  
Photon Scattering
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