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In a few recent papers we introduced the chirality-flow formalism, which was shown to make calculations of tree-level Feynman diagrams simple and transparent. Chirality flow, which is based on the spinor-helicity formalism, allows to often immediately analytically write down a tree-level Feynman diagram in terms of spinor inner products. In this paper, we argue that there is also a significant sim
When you first step ashore the island of Ven, in Öresund right between Sweden and Denmark, you have two options. Either you go straight ahead, towards the bike rental, or you turn to your right and start walking along the shore. If you do so, you will soon start to find colourful pebbles on the ground along the waterline. Some are round and soft to the touch, others are rough and edgy, and they ar
The purpose of this study is to give an insight into the archival management of six student nations at Lund University, as well as the general view of the archive amongst the members who are responsible for the student nation archives. The majority of the student nations are well over 300 years old, but there have been few or no studies about the student nations archives, a knowledge gap this stud
Purpose The purpose of this thesis is to contribute with knowledge on consumer identity in a social media setting and how companies can utilize this behaviour for effective marketing. Method The thesis adopts a constructivist perspective on how we interpret our interviewees, the reality and our own research role. The interviews have been inspired by both ethnographic and a phenomenological appro
Business Leader Lars Ljungälv and Professors Viswanath Venkatesh and Stephen Broadberry Appointed Honorary Doctors at LUSEM Professor Viswanath Venkatesh, from the Pamplin Business School at Virginia Tech University, is the world's most influential researcher in the field of information systems. His research focuses on the diffusion and adoption of information systems at the societal, organization
https://www.lusem.lu.se/article/honorary-doctors-2025 - 2026-05-30
I det internationella samarbetet som rör utlämning på grund av brott finns den folkrättsliga principen aut dedere aut judicare. Den innebär att om en stat vägrar att utlämna en person, ofta mot bakgrund av att personen är medborgare i den staten, kan staten åta sig att lagföra personen för den brottslighet hen är misstänkt för. Uppsatsens fokus har varit att utreda ifall en sådan lagföring regelmä
This paper is concerned with calculating the branching ratio of the decay A1 −→ Υ + γ of a pseudo-scalar Higgs boson, where Υ is a bound vector meson state of the quarks b and b-bar The results will then be applied to the b. phenomenology of the Next-to-Minimal Supersymmetric Standard Model in the case where A1 has a mass in the interval 9.46 − 12 GeV . The paper will review the concept of spontan
The finite temperature behaviour of lattice QCD with dynamical quarks for small number of flavours Nf is investigated. Simulations have been performed on lattices of size N3σ·4 with Nσ=8 and 12 and staggered fermions of mass ma=0.1 using a hybrid algorithm. We find that the two state signal at the critical point of the pure gauge theory, which is taken as sign for a fiorst order phase transition,
Den tekniska utvecklingen på betalningsmarknaden har resulterat i att bedragare använder alltmer sofistikerade metoder för att lura sina offer på pengar. I Sverige har särskilt bankbedrägerier genom social manipulation ökat de senaste åren. Enligt 5a kap. 1 § betaltjänstlagen bär banken som huvudregel det ekonomiska ansvaret för obehöriga transaktioner. För att bestämmelsen ska vara tillämplig kräTechnological developments in the payment market have resulted in fraudsters using increasingly sophisticated methods to defraud their victims of money. In Sweden, bank fraud through social engineering has increased in recent years. According to Chapter 5a, Section 1 of the Payment Services Act, the bank bears, as a general rule, the financial responsibility for unauthorized transactions. However,
In the ocean, carbon export is driven by the biological carbon pump where organic matter is transported from the surface layer to the deep sea. The sinking particulate organic matter is mainly a product of phytoplankton aggregates and faecal pellets from zooplankton & fish, together also known as “marine snow”. Marine snow is continuously being degraded by microbial and zooplankton activities
A brief review is given for the use of feed-back artificial neural networks (ANN) to obtain good approximate solutions to combinatorial optimization problems. The key element is the mean field approximation (MFT), which differs from conventional methods and "feels" its ways towards good solutions rather than fully or partly exploring different possible solutions. The methodology, which is illustra
Parton shower algorithms are key components of theoretical predictions for high-energy collider physics. Work toward more accurate parton shower algorithms is thus pursued along many different avenues. The systematic treatment of subleading color corrections in parton shower algorithms is, however, technically challenging and remains elusive. In this article, we present an efficient and numericall
We consider the central exclusive production of qq̄ pairs and Higgs boson in proton-proton collisions at LHC. The amplitude for the process is derived within the k -factorization approach and considered in different kinematical asymptotics, in particular, in the important high quark transverse momenta and massless quark limits. Quark helicity and spin-projection amplitudes in two different frames
Attempts of Magain et al. to detect the host galaxy of the bright quasi-stellar object (QSO) HE0450-2958 have not been successful. We suggest that the supermassive black hole (SMBH) powering the QSO was ejected from the observed ultraluminous infrared galaxy (ULIRG) at the same redshift and at 1.5 arcsec distance. Ejection could have been caused either by recoil due to gravitational wave emission
Zinc is an element of importance in many research fields within astronomy and astrophysics, from cosmology to stellar atmosphere dynamics. With the aim of improving three decades old measurements of zinc lines of astrophysical interest, emission spectra of Zn I and Zn II have been recorded using a Fourier Transform Spectrometer with a hollow cathode light source. Revised energies for previously kn
Examensarbetets titel: Vem är intresserad av acceleratorer? En studie av acceleratorer och dess intressenter. Seminariedatum: 2019-06-05 Ämne/kurs: FEK69: Examensarbete i Redovisning, 15 högskolepoäng. Författare: Rikard Jannesson, Tyko Carling och Martin Trollér Handledare: Gert Paulsson Fem nyckelord: Startup, Accelerator, Innovation, Venture Capital, Intressentmodellen. Syfte: Syftet med dTitle: Who is interested in accelerators? A study of accelerators and their stakeholders. Seminar date: 2019-06-05 Course: FEK69: Degree Project Undergraduate level, Financial Accounting, Undergraduate level, 15 ECTS. Authors: Rikard Jannesson, Tyko Carling och Martin Trollér Advisor: Gert Paulsson Key words Startup, Accelerator, Innovation, Venture Capital, Stakeholder Theory Purpose: The pu
We report on the status of efforts to improve the reinterpretation of searches and measurements at the LHC in terms of models for new physics, in the context of the LHC Reinterpretation Forum. We detail current experimental offerings in direct searches for new particles, measurements, technical implementations and Open Data, and provide a set of recommendations for further improving the presentati
We test the hypothesis that the spread in the age-metallicity plot of the solar neighborhood is due to a mixture of stars belonging to kinematically different sub-populations of the Galactic disk, i.e., the thin and the thick disk. We use a kinematic subsample of similar to 600 stars from a sample of similar to 6000 dwarf and subgiant stars from the Hipparcos catalog. All of these stars have a ful
