fast simulation
Recently Published Documents


TOTAL DOCUMENTS

718
(FIVE YEARS 136)

H-INDEX

33
(FIVE YEARS 4)

2021 ◽  
Vol 81 (12) ◽  
Author(s):  
Yu-Lan Fan ◽  
Xiao-Dong Shi ◽  
Xiao-Rong Zhou ◽  
Liang Sun

AbstractWe report a sensitive study of measuring $$b\rightarrow s\gamma $$ b → s γ photon polarisation in $$D^{0}\rightarrow K_1(1270)^-e^+\nu _e$$ D 0 → K 1 ( 1270 ) - e + ν e with an integrated luminosity of $$\mathscr {L}$$ L = 1 ab$$^{-1}$$ - 1 at a center-of-mass energy of 3.773 GeV at a future Super Tau Charm Facility. More than 61,000 signals of $$D^{0}\rightarrow K_1(1270)^-e^+\nu _e$$ D 0 → K 1 ( 1270 ) - e + ν e are expected. Based on a fast simulation software package, the statistical sensitivity for the ratio of up-down asymmetry is estimated to be $$1.5\times 10^{-2}$$ 1.5 × 10 - 2 by performing a two-dimensional angular analysis in $$D^{0}\rightarrow K_1(1270)^-e^+\nu _e$$ D 0 → K 1 ( 1270 ) - e + ν e . Combining with measurements of up-down asymmetry in $$B\rightarrow K_1\gamma $$ B → K 1 γ , the photon polarisation in $$b\rightarrow s\gamma $$ b → s γ can be determined model-independently.


2021 ◽  
Vol 21 (20) ◽  
pp. 15901-15927
Author(s):  
Anthony C. Jones ◽  
Adrian Hill ◽  
Samuel Remy ◽  
N. Luke Abraham ◽  
Mohit Dalvi ◽  
...  

Abstract. Ammonium nitrate is a major aerosol constituent over many land regions and contributes to air pollution episodes, ecosystem destruction, regional haze, and aerosol-induced climate forcing. Many climate models that represent ammonium nitrate assume that the ammonium–sulfate–nitrate chemistry reaches thermodynamic equilibrium instantaneously without considering kinetic limitations on condensation rates. The Met Office's Unified Model (UM) is employed to investigate the sensitivity of ammonium nitrate concentrations to the nitric acid uptake coefficient (γ) in a newly developed nitrate scheme in which first-order condensation theory is utilised to limit the rate at which thermodynamic equilibrium is attained. Two values of γ representing fast (γ=0.193) and slow (γ=0.001) uptake rates are tested in 20-year global UM integrations. The global burden of nitrate associated with ammonium in the “fast” simulation (0.11 Tg[N]) is twice as great as in the “slow” simulation (0.05 Tg[N]), while the top-of-the-atmosphere radiative impact of representing nitrate is −0.19 W m−2 in the fast simulation and −0.07 W m−2 in the slow simulation. In general, the fast simulation exhibits better spatial correlation with observed nitrate concentrations, while the slow simulation better resolves the magnitude of concentrations. Local near-surface nitrate concentrations are found to be highly correlated with seasonal ammonia emissions, suggesting that ammonia is the predominant limiting factor controlling nitrate prevalence. This study highlights the high sensitivity of ammonium nitrate concentrations to nitric acid uptake rates and provides a novel mechanism for reducing nitrate concentration biases in climate model simulations. The new UM nitrate scheme represents a step change in aerosol modelling capability in the UK across weather and climate timescales.


PRX Quantum ◽  
2021 ◽  
Vol 2 (4) ◽  
Author(s):  
J. Eli Bourassa ◽  
Nicolás Quesada ◽  
Ilan Tzitrin ◽  
Antal Száva ◽  
Theodor Isacsson ◽  
...  

2021 ◽  
pp. 147-157
Author(s):  
Vincenzo Vodola ◽  
Ernesto Antonini ◽  
Jacopo Gaspari ◽  
Lia Marchi

Urban Climate ◽  
2021 ◽  
Vol 39 ◽  
pp. 100941
Author(s):  
Songlin Xiang ◽  
Jingcheng Zhou ◽  
Xiangwen Fu ◽  
Leyi Zheng ◽  
Yuqing Wang ◽  
...  

2021 ◽  
Author(s):  
Jintaek Kang ◽  
Changjae Yi ◽  
Keonjoo Lee ◽  
Seungwook Lee ◽  
Soojung Ryu ◽  
...  

2021 ◽  
Vol XXIV (Issue 3) ◽  
pp. 1084-1094
Author(s):  
Pawel Pawlewski ◽  
Adam Olszewski

Sign in / Sign up

Export Citation Format

Share Document