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The ongoing and planned experimental activities with direct reference to light unflavoured pseudoscalar mesons motivate a new theoretical study regarding their properties. An overview including details on new precise calculations is presented.

The evolution of the widely-used PYTHIA particle physics event generator is outlined, from the early days to the current status and plans. The key decisions and the development of the major physics components are put in context.

In this article, a framework for hadronic rescattering in the general-purpose Pythia event generator is introduced. The starting point is the recently presented space–time picture of the hadronization process. It is now extended with a tracing of the subsequent motion of the primary hadrons, including both subsequent scattering processes among them and decays of them. The major new component is cr

I present the status of the ThePEG project for creating a common platform for implementing C++ event generators. I also describe briefly the status of the new versions of HERWIG++ and Ariadne which are implemented using this framework.

What can be done when combining leftover material from small scale wood and textile productions? The increased awareness of the importance of sustainability has created a possibility for a more climate friendly future. But at the same time, biodiversity is at risk due to overstraining practices used by forest and textile industries. Do we have to choose between one or the other when ensuring a gre

https://www.industridesign.lth.se/en/repurposed - 2026-05-17

We discuss the Langevin equation for a complex Boltzmann distribution, allowing for modifications of the process. The relation between the two different time development operators involved is analyzed, with emphasis on their spectra.

Alla ekosystem, skogar, sjöar, hav etc., är föränderliga och står under konstant påverkan, såväl inre som yttre, vilken försöker driva det för stunden rådande tillståndet åt olika håll. Sjöar har två dominerande tillstånd som de kan befinna sig i, antingen är de näringsfattiga och klara eller så är de näringsrika och grumliga. I den har studien har jag undersökt Börringesjön, i södra Skåne. SyftetAbstract All ecosystems, forests, lakes, seas etc., are changeable and are under constant influence, inner as well as outer, that try to push the for the moment present state in different directions. Lakes have two dominating states in which they can exist, they are either clear and low in nutrients or turbid and high in nutrients. In this study I have been examining lake Börringesjön in the sout

I present the status of the THEPEG project for creating a common platform for implementing C++ event generators. I also describe briefly the status of the new versions of PYTHIA, HERWIG and ARIADNE which are implemented using this framework.

We comment on the recent calculations of the pion pole part of the light-by-light contribution to the muon anomalous magnetic moment and we point out where the analysis in our previous work was mistaken.

A linear system – one that extracts materials and then puts them in landfills and incinerates them, thus creating a demand for even more materials – is fundamentally unsustainable. Swedish waste management is thought by many to be progressive and at the forefront, when looking at the waste hierarchy. While there is a ban on landfilling non-hazardous and organic waste in Sweden, around 50% is incin

The formation mechanism of the barium stars is thought to be well understood. Barium-rich material, lost in a stellar wind from a thermally-pulsing asymptotic-giant branch star in a binary system, is accreted by its companion main-sequence star. Now, many millions of years later, the primary is an unseen white dwarf and the secondary has itself evolved into a giant which displays absorption lines

Recent work by Nissen and Schuster have found two distinct populations of halo stars with -1<5 alpha [Fe/H] -0<5. Both populations are kinematically selected to be halo stars. The differences between the two groups are the alpha -elemental abundances and the [Na/Fe] and [Ni/Fe] ratios. From angular momentum space, we can see that the majority of these stars do not show any extreme kinematic indica

The use of Object Oriented Programming languages and techniques for the development of Monte Carlo simulators for particle production and decay is discussed. For illustration, two specific "template" programs are presented written in Objective-C and in C++, respectively

Arguments are presented in favour of observing charmed baryons in diffractive scattering at high energies. The cross section for production of charmed baryons is estimated to be ∼ 10-100 μb at ISR energies.

The New Horizons flyby of the cold classical Kuiper Belt object MU69 showed it to be a contact binary. The existence of other contact binaries in the 1–10 km range raises the question of how common these bodies are and how they evolved into contact. Here we consider that the pre-contact lobes of MU69 formed as a binary embedded in the Solar nebula, and calculate its subsequent orbital evolution in

Denna sammanläggningsavhandling består av fyra artiklar, som alla berör olika utvidgningar av Standardmodellen (SM). De första två artiklarna behandlar en specifik, supersymmetrisk, storförenad teori (GUT), medan de senare två klassificerar alla anomali-fria instanser av 2-Higgs-dubblett modeller (2HDMs) med en gauge:ad abelsk symmetri. Artikel I. I denna artikel presenterar vi en alternativ lösniThis thesis is composed of four papers, which all treat various extensions to the Standard Model (SM). The first two papers concern a particular supersymmetric, grand-unified theory (GUT), while in the latter two, we classify anomaly-free implementations of two-Higgs doublet models (2HDM) with a gauged abelian symmetry. Paper I. In this paper, we present an alternative solution for avoiding GUT-sc