scholarly journals Impact of neutrino pair-production rates in core-collapse supernovae

2020 ◽  
Vol 102 (12) ◽  
Author(s):  
Aurore Betranhandy ◽  
Evan O’Connor
Keyword(s):  
Pair Production ◽  
Core Collapse ◽  
Production Rates ◽  
Neutrino Pair

scholarly journals Signs of new physics in top quark pair production associated with a neutrino pair at the LHC

2020 ◽  
Vol 101 (9) ◽  
Author(s):  
Daruosh Haji Raissi ◽  
Javad Ebadi ◽  
Mojtaba Mohammadi Najafabadi
Keyword(s):  
Pair Production ◽  
Top Quark ◽  
New Physics ◽  
Neutrino Pair

scholarly journals Two new submodels for the Modular Earth Submodel System (MESSy): New Aerosol Nucleation (NAN) and small ions (IONS) version 1.0

2018 ◽  
Author(s):  
Sebastian Ehrhart ◽  
Eimear M. Dunne ◽  
Hanna E. Manninen ◽  
Tuomo Nieminen ◽  
Jos Lelieveld ◽  
...  
Keyword(s):  
Pair Production ◽  
Production Rate ◽  
Aerosol Particle ◽  
Atmospheric Chemistry ◽  
Particle Formation ◽  
Ion Pair ◽  
New Particle Formation ◽  
Production Rates ◽  
Organic Species ◽  
Good Agreement

Abstract. Two new submodels for the Modular Earth Submodel System (MESSy) were developed. The New Aerosol Nucleation submodel (NAN) includes new parameterisations of aerosol particle formation rates published in recent years. These parameterisations include ion-induced nucleation and nucleation of pure organic species. NAN calculates the rate of new particle formation based on the aforementioned parameterisations for aerosol submodels in the ECHAM/MESSy Atmospheric chemistry - Climate (EMAC) model. The Ion pair production rate, needed to calculate the ion-induced or -mediated nucleation, is described using the new submodel IONS, which provides ion pair production rates for other submodels within the MESSy framework. Both new submodels were tested in EMAC simulations. These simulations showed good agreement with ground based observations.

scholarly journals Two new submodels for the Modular Earth Submodel System (MESSy): New Aerosol Nucleation (NAN) and small ions (IONS) version 1.0

2018 ◽  
Vol 11 (12) ◽  
pp. 4987-5001
Author(s):  
Sebastian Ehrhart ◽  
Eimear M. Dunne ◽  
Hanna E. Manninen ◽  
Tuomo Nieminen ◽  
Jos Lelieveld ◽  
...  
Keyword(s):  
Pair Production ◽  
Production Rate ◽  
Aerosol Particle ◽  
Atmospheric Chemistry ◽  
Particle Formation ◽  
Ion Pair ◽  
New Particle Formation ◽  
Production Rates ◽  
Organic Species ◽  
Good Agreement

Abstract. Two new submodels for the Modular Earth Submodel System (MESSy) were developed. The New Aerosol Nucleation (NAN) submodel includes new parameterisations of aerosol particle formation rates published in recent years. These parameterisations include ion-induced nucleation and nucleation of pure organic species. NAN calculates the rate of new particle formation based on the aforementioned parameterisations for aerosol submodels in the ECHAM/MESSy Atmospheric Chemistry (EMAC) model. The ion pair production rate, needed to calculate the ion-induced or ion-mediated nucleation, is described using the new submodel IONS, which provides ion pair production rates for other submodels within the MESSy framework. Both new submodels were tested in EMAC simulations. These simulations showed good agreement with ground-based observations.

scholarly journals Consequences of Massive Neutrino to Astrophysics and Cosmology

2020 ◽  
pp. 50-58
Author(s):  
E. Comay
Keyword(s):  
Pair Production ◽  
Weak Interactions ◽  
Big Bang ◽  
Low Energy ◽  
Electromagnetic Interactions ◽  
Pair Annihilation ◽  
Massive Spin ◽  
Charged Pions ◽  
Neutrino Pair ◽  
The Big Bang

It is now recognized that a neutrino is a massive spin-1/2 particle. Consequently, neutrino- antineutrino pair production and their pair annihilation are theoretically valid processes. The data prove that the strength of weak interactions increases with collision energy. Therefore, a neutrino pair production event is expected to be a significant process in the region which is just outside the event horizon of a black hole. Another neutrino source is the pair production of particles like muons and charged pions whose decay produces neutrinos. Similarly, copious neutrino pair production events are expected to take place right after the big bang. Since a neutrino does not directly participate in electromagnetic interactions, its pair annihilation cannot directly produce photons. For this reason, a low energy neutrino-antineutrino collision can only go to another neutrino-antineutrino pair. It follows that the number of low energy neutrinos increases with time. This effect may contribute to the problem of the missing mass of the universe.

Neutrino Pair Production in Bound-Bound Transitions

1966 ◽  
Vol 151 (4) ◽  
pp. 1189-1191
Author(s):  
Gary Steigman
Keyword(s):  
Pair Production ◽  
Neutrino Pair

scholarly journals Higgs-mediated heavy neutrino pair-production at pp supercolliders

1993 ◽  
Vol 308 (3-4) ◽  
pp. 394-402 ◽  
Author(s):  
Debajyoti Choudhury ◽  
Rohini M. Godbole ◽  
Probir Roy
Keyword(s):  
Pair Production ◽  
Heavy Neutrino ◽  
Neutrino Pair

scholarly journals Simulating hard photon production with Whizard

2020 ◽  
Vol 80 (7) ◽  
Author(s):  
J. Kalinowski ◽  
W. Kotlarski ◽  
P. Sopicki ◽  
A. F. Żarnecki
Keyword(s):  
Dark Matter ◽  
Pair Production ◽  
Cross Sections ◽  
New Physics ◽  
Hard Photon ◽  
Initial State ◽  
Flexible Tool ◽  
Bhabha Scattering ◽  
State Radiation ◽  
Neutrino Pair

Abstract One of the important goals of the proposed future $$\hbox {e}^{+}\hbox {e}^{-}$$e+e- collider experiments is the search for dark matter particles using different experimental approaches. The most general search approach is based on the mono-photon signature, which is expected when production of the invisible final state is accompanied by a hard photon from initial state radiation. Analysis of the energy spectrum and angular distributions of those photons can shed light on the nature of dark matter and its interactions. Therefore, it is crucial to be able to simulate the signal and background samples in a uniform framework, to avoid possible systematic biases. The Whizard program is a flexible tool, which is widely used by $$\hbox {e}^{+}\hbox {e}^{-}$$e+e- collaborations for simulation of many different “new physics” scenarios. We propose the procedure of merging the matrix element calculations with the lepton ISR structure function implemented in Whizard. It allows us to reliably simulate the mono-photon events, including the two main Standard Model background processes: radiative neutrino pair production and radiative Bhabha scattering. We demonstrate that cross sections and kinematic distributions of mono-photon in neutrino pair-production events agree with corresponding predictions of the $$\mathcal{KK}$$KK MC, a Monte Carlo generator providing perturbative predictions for SM and QED processes, which has been widely used in the analysis of LEP data.

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