τ− → π−π0ντ and e+e− → π+π− Processes in the Chiral Nambu—Jona-Lasinio Model Including the Interaction of Pions in the Final State

Polariton devices offer multiple advantages compared to conventional semiconductor devices. The bosonic nature of exciton polaritons offers opportunity of realisation of polariton lasers: coherent light sources based on bosonic condensates of polaritons. The final state stimulation of any transition feeding a polariton condensate has been used in many proposals such as for terahertz lasers based on polariton lasers. Furthermore, large coherence lengths of exciton-polaritons in microcavities open the way to realisation of polariton transport devices including transistors and logic gates. Being bosonic spin carriers, exciton-polaritons may be used in spintronic devices and polarisation switches. This chapter offers an overview on the existing proposals for polariton devices.

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Charmed and bottomed hadronic cross sections from a statistical model

The European Physical Journal A ◽

10.1140/epja/s10050-020-00251-4 ◽

2020 ◽

Vol 56 (9) ◽

Author(s):

Gábor Balassa ◽

György Wolf

Keyword(s):

Statistical Model ◽

Energy Range ◽

Cross Sections ◽

Heavy Quarks ◽

Open Charm ◽

Low Energy ◽

Final State ◽

Proton Antiproton ◽

Proton Proton

Abstract In this work, we extended our statistical model with charmed and bottomed hadrons, and fit the quark creational probabilities for the heavy quarks, using low energy inclusive charmonium and bottomonium data. With the finalized fit for all the relevant types of quarks (up, down, strange, charm, bottom) at the energy range from a few GeV up to a few tens of GeV’s, the model is now considered complete. Some examples are also given for proton–proton, pion–proton, and proton–antiproton collisions with charmonium, bottomonium, and open charm hadrons in the final state.

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Collinear expansion for color singlet cross sections

Journal of High Energy Physics ◽

10.1007/jhep09(2020)181 ◽

2020 ◽

Vol 2020 (9) ◽

Author(s):

Markus A. Ebert ◽

Bernhard Mistlberger ◽

Gherardo Vita

Keyword(s):

Cross Section ◽

Cross Sections ◽

Production Cross ◽

Gluon Fusion ◽

Building Blocks ◽

Color Singlet ◽

Final State ◽

Beam Function ◽

Kinematic Limit ◽

State Radiation

Abstract We demonstrate how to efficiently expand cross sections for color-singlet production at hadron colliders around the kinematic limit of all final state radiation being collinear to one of the incoming hadrons. This expansion is systematically improvable and applicable to a large class of physical observables. We demonstrate the viability of this technique by obtaining the first two terms in the collinear expansion of the rapidity distribution of the gluon fusion Higgs boson production cross section at next-to-next-to leading order (NNLO) in QCD perturbation theory. Furthermore, we illustrate how this technique is used to extract universal building blocks of scattering cross section like the N-jettiness and transverse momentum beam function at NNLO.

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The Superiority of Quantum Strategy in 3-Player Prisoner’s Dilemma

Mathematics ◽

10.3390/math9121443 ◽

2021 ◽

Vol 9 (12) ◽

pp. 1443

Author(s):

Zhiyuan Dong ◽

Ai-Guo Wu

Keyword(s):

Game Theory ◽

Prisoner's Dilemma ◽

Prisoner’S Dilemma ◽

Quantum Game ◽

Final State ◽

The Game Theory ◽

Initial States ◽

Quantum Strategy ◽

Selection Of

In this paper, we extend the quantum game theory of Prisoner’s Dilemma to the N-player case. The final state of quantum game theory of N-player Prisoner’s Dilemma is derived, which can be used to investigate the payoff of each player. As demonstration, two cases (2-player and 3-player) are studied to illustrate the superiority of quantum strategy in the game theory. Specifically, the non-unique entanglement parameter is found to maximize the total payoff, which oscillates periodically. Finally, the optimal strategic set is proved to depend on the selection of initial states.

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