Dark photon

The one-loop contribution axion-photon-photon coupling is presented in the framework of the 3-3-1 model, in which the loop diagrams are finite. The decay of axion into two photons is demonstrated. This study shows that it is easy to fulfill dark matter candidate conditions for the axion in the model.

8p meyerowitz 25-12-2021 16 0   Download

Photon - Saxion conversions in strong magnetic fields with dimensions are considered in detail by the Feynman diagram methods. The differential cross sections (DCS) are presented and numerical evaluation is given. Based on the results, they show that the saxion can be a good candidate for the cold dark matter (CDM).

4p thienlangso 15-12-2021 10 1   Download

At present, it is well known that neutrinos are massive that contradicts the Standard Model (SM). The experimental data show that masses of neutrinos are tiny small and neutrinos mix with special pattern in approximately tribimaximal form. The neutrino masses, dark matter and the baryon asymmetry of Universe (BAU) are the facts requiring extension of the SM.

12p vijichoo2711 04-06-2021 9 1   Download

Despite the prediction of the Higgs boson at Large Hadron Collider (LHC) in the CERN in 2012 after it has been theorized for over 50 years, however, the Standard model (SM) still can not explain the mass of neutrinos; the hierarchy problem; the contribution of dark energy, dark matter and CP violation in cosmology.

7p tamynhan9 02-12-2020 9 1   Download

Dark matter (DM) is a special matter kind. The total amount of dark matter should be around five times bigger than that of ordinary matter. Currently, there are many dark matter models, such as the Cold Dark Matter model with a cosmological constant (ΛCDM) [1] and the vector-fermion dark matter model.

7p nguathienthan6 06-07-2020 6 1   Download

In this work, we study the possible dark photon signatures through Bhabha scattering. The numerical results show that the total cross sections with dark photon effects are about 0.006 – 0.007 femtobarn. This could have important implications for dark photon searches.

6p vimoskva2711 02-01-2020 6 0   Download

Phototrophy is the process by which organisms trap photons and store energy as chemical energy in the form of adenosine triphosphate (ATP). ATP transports chemical energy within cells for metabolism. There are three major types of phototrophy: Oxygenic and Anoxygenic photosynthesis, and Rhodopsin-based phototrophy. Photosynthesis is a chemical process that converts carbon dioxide into different organic compounds using solar energy. Oxygenic and anoxygenic photosynthesis undergo different reactions in the presence and absence of light (called light and dark reactions, respectively).

440p conquynho32 15-09-2012 114 8   Download

The ambulance sped down the Denver highway carrying Mr. Rosnes Avon to the hospital. The flashing lights illuminated the darkness of the night, and the siren alerted those drivers who braved the icy cold weather.Mrs. Avon’s voice was clearly shaken as she placed the emergency telephone call a few minutes earlier. Her hus- band was complaining of severe palpitations in his heart and shortness of breath. She sat next to him in the rear of the ambulance and held his hand in silence, but her eyes could not hide her concern and fear....

180p beobobeo 01-08-2012 49 8   Download