scholarly journals New physics searches at the ILC positron and electron beam dumps

2021 ◽  
Vol 2021 (9) ◽  
Author(s):  
Kento Asai ◽  
Sho Iwamoto ◽  
Yasuhito Sakaki ◽  
Daiki Ueda
Keyword(s):  
Positron Beam ◽  
New Physics ◽  
Beam Dump ◽  
Dark Photon ◽  
Electron Positron ◽  
Pair Annihilation ◽  
Light Scalar ◽  
Production Mechanisms ◽  
Electron Positron Pair ◽  
Higher Sensitivity

Abstract We study capability of the ILC beam dump experiment to search for new physics, comparing the performance of the electron and positron beam dumps. The dark photon, axion-like particles, and light scalar bosons are considered as new physics scenarios, where all the important production mechanisms are included: electron-positron pair-annihilation, Primakoff process, and bremsstrahlung productions.We find that the ILC beam dump experiment has higher sensitivity than past beam dump experiments, with the positron beam dump having slightly better performance for new physics particles which are produced by the electron-positron pair-annihilation.

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.

The Conservation of Energy and Momentum in the Positron-Electron Annihilation According to Complete Relativity

2014 ◽  
Vol 5 (3) ◽  
pp. 854-858
Author(s):  
Giuseppe Bellotti
Keyword(s):  
Three Dimensional ◽  
Standing Waves ◽  
Energy Conditions ◽  
Conservation Of Energy ◽  
Electron Positron ◽  
Pair Annihilation ◽  
Conservation Of Momentum ◽  
Energy And Momentum ◽  
The Right ◽  
Electron Positron Pair

According to Complete Relativity (an improvement of Special Relativity where a new postulate was introduced: an electron cannot move at average speeds less than  u0 = αc / π  where  α  is the constant of fine structure and  c  is the speed of light), and with the hypothesis that the electron and positron are two three-dimensional electromagnetic spherical standing waves, the electromagnetic standing waves of an electron-positron pair can overlap in the low energy conditions and generate a single  γ ray  of  E = 1.022  MeV.  Instead the actual physical theories consider a model of positron-electron pair annihilation, where conservation of momentum requires the creation of two 511 keV photons moving toward opposite directions. But in the paper we do not consider any photons: there is only a progressive electromagnetic wave compound by two electromagnetic standing waves. Only a thorough test will be able to decide the right model.

Generation of dense and well-collimated positron beam via ultra-intense laser colliding with a flying plasma layer

2021 ◽  
Author(s):  
QianQian Han ◽  
Xuesong Geng ◽  
Baifei Shen ◽  
Liangliang Ji ◽  
Zhizhan Xu
Keyword(s):  
Plasma Layer ◽  
Thin Foil ◽  
Positron Beam ◽  
Laser Pulses ◽  
Intense Laser ◽  
High Yield ◽  
Intensity Level ◽  
Electron Positron ◽  
Large Peak ◽  
Electron Positron Pair

Abstract With the forthcoming 10-100PW laser facilities, laser-driven electron-positron-pair production has gained particular interest. Here a scheme to enhance the generation of dense electron-positron-pairs is proposed and numerically demonstrated, employing double laser pulses at the intensity level of 10^23 W cm^(-2). The first laser accelerates a thin foil to a relativistic speed via the radiation-pressure-acceleration mechanism and a counter-propagating laser irradiates this flying plasma layer. The simulation results indicate that a high-yield and well-collimated positron beam (~5.5×10^10 positrons/pulse, 8.8nC/pulse) is generated with a large peak density(1.1×10^21 cm^(-3) ) by using tens-of-PW laser pulses.

scholarly journals Dark Photon Searches Using Displaced Vertices at Low Energye+e-Colliders

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Fabio Bossi
Keyword(s):  
Search Strategy ◽  
Massive Particle ◽  
Interaction Point ◽  
Dark Photon ◽  
Electron Positron ◽  
The Standard Model ◽  
Long Lifetime ◽  
Electron Positron Pair ◽  
Very High ◽  
Primary Interaction

The existence of a new, photon-like, massive particle, theγ′or dark photon, is postulated in several extensions of the Standard Model. These models are often advocated to explain some recent puzzling astrophysical observations, as well as to solve the so far unexplained deviation between the measured and calculated values of the muon anomaly. Dark photons can be produced ate+e-colliders both in continuum events and in vector meson transitions and can eventually decay into an electron-positron pair. For a proper choice of the parameters of the theory, aγ′can have a relatively long lifetime and can therefore be observed as ane+e-vertex well separated by the primary interaction point. This case is discussed in reference to very high luminositye+e-colliders either in construction or under study in several laboratories in the world. It is shown that a search strategy based on the detection of displaced vertices can be in principle very effective in covering a rather wide and to date unexplored region of the theoretical parameters space.

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