Neutrinos in the Energy range above 10 PeV will provides important information on very high energy processes in the universe and the origin of the highest energy Cosmic rays. Additionally neutrino properties can be studied. The detection of these neutrinos is challenging, a large volume of detector material needs to be monitored. The economically feasible method is detection of radio signals...
Supernovae are the spectacular end in the lives of massive stars. Neutrinos are an important player in the explosion and account for 99% of the explosion energy. IceCube, a detector embedded in the ice at the South Pole, will make a precision measurement of the neutrino rate from the next galactic supernova. This measurement will give us an unprecedented look at the inner structure of the...
The existence of relic neutrinos from the big bang is a well established fact in any cosmological model. Since they are expected to currently have an energy of a few milielectronvolts, their detection is a huge technological challenge. The PTOLEMY detector is a proposal to directly detect the cosmic neutrino background by looking at the very rare electrons emitted in the inverse beta decay of...
Magnetic monopoles are predicted to exist in many extensions and unifications of the Standard Model of particle physics. A magnetic monopole passing through the IceCube detector array would be readily detected via its characteristic light output. In this talk I will report on the progress of the search for magnetic monopoles ongoing in the Uppsala University IceCube group.
In collider experiments, such as the Large Hadron Collider (LHC), an unknown particle could be produced from a pair of quarks in proton-proton collisions. In simplified dark matter (DM) models, this particle could then decay either into WIMP (Weakly-Interacting Massive Particles) dark matter or into Standard Model (SM) particles, acting as a mediator between ordinary matter and dark matter....
Centaurus A is the nearest radio-galaxy and an excellent laboratory to study the origin of particle acceleration responsible for the High-Energy (HE) and Very-High-Energy (VHE) gamma-ray emission in Active Galactic Nuclei. The H.E.S.S. and Fermi-LAT collaborations have together recently published the most up-to-date Spectral Energy Distribution of its core emission. I will present these recent...
Imaging Atmospheric Cherenkov Telescopes together with the Fermi-LAT satellite have, in the last 15 years, unveiled how rich the Universe is in powerful mechanisms able to accelerate particles which then produce High Energy (HE) and Very High Energy (VHE) gamma-rays. Some of the gamma-ray emitting sources are found to be steady with respect to the sensitivity of the instruments, while many of...
The 2.0 GeV, 5 MW proton linac for the European Spallation Source, ESS, will have the capacity to send extra pulses to a neutrino target, giving an excellent opportunity to produce an unprecedented high performance neutrino beam, the ESS neutrino Super Beam, ESSnuSB. The proton pulse power for the neutrino target can be as high as 5 MW, which will be the world’s most powerful neutrino source,...
The interactions between charged particles are derived from the relativistic Lienard-Wiechert four-potential. This expression is usually broken into field components and solved statically (Coulombic). However, to study high-intensity, high-precision beams, one can to simulate bunch dynamics by incorporating the full potential into a Lorentz-covariant Hamiltonian.
Methods are shown for...
The current Inner Detector (ID) of the ATLAS experiment, despite its excellent current performance, will not meet the harsh requirements of the High Luminosity-LHC upgrade. A newly designed inner detector Inner Tracker (ITk) composed uniquely of semi-silicon pixels and strip detectors will be installed from 2024 to 2026. This contribution summarizes the activities within the different...
The presentation will summarize the scope and status of the SHIFT project, which is a collaboration between experimental and theoretical particle physicists at Chalmers, Stockholm and Uppsala. The focus is to search for top partners that can protect the mass of the Higgs boson from large quantum corrections. We study possible signatures of such top partners and search for them using data from...
It is universally accepted that the Standard Model (SM) is incomplete, and many
models that describe physics Beyond the Standard Model (BSM) has by necessity
an extended Higgs sector. The smallest extensions add one additional Higgs
doublet to the one already present in the SM. These models are collectively
called Two Higgs Doublet Models (2HDM). The scalar particle observed in 2012 is
then...
This report presents a combination of searches for Higgs boson pairs using up to 36.1 fb$^{−1}$ of proton-proton collision data at a centre-of-mass energy $\sqrt{s}=13$ TeV recorded with the ATLAS detector at the LHC. The combination is performed using three analyses searching for the $HH\rightarrow b\bar{b}b\bar{b}$, $HH\rightarrow b\bar{b}\tau^{+}\tau^{-}$ and $HH\rightarrow...
The LHC delivers an unprecedented number of proton-proton collisions to its experiments. In kinematic regimes first studied by earlier generations of collider experiments, the limiting factor to more deeply probing for new physics can be the online and offline computing, and offline storage, requirements for the recording and analysis of this data. In this contribution, we describe a strategy...
By offering a solution to the long-standing hierarchy problem, supersymmetry becomes one of the most searched extension to the Standard Model (SM) in the field of experimental high energy physics. Supersymmetry introduces each SM particle with a supersymmetric partner which has identical quantum number but a half-unit difference in spin. Supersymmetry can also answer the existence of dark...
The generation mechanism of neutrino mass is one of the major problems remained in the Standard Model. One of the possible solutions is to introduce exotic Higgs bosons which generate neutrino mass through the Seesaw mechanism. The SSDiLep group works on studying the doubly-charged Higgs bosons, predicted in a large variety of BSM models such as left-right symmetric model, Higgs triplet models...
Summary of activities in the Lund ALICE group.
The origin and observed abundance of Dark Matter can be explained elegantly by the thermal freeze-out mechanism, leading to a preferred mass range for Dark Matter particles in the ~MeV-TeV region. The GeV-TeV mass range is being explored intensively by a variety of experiments searching for Weakly Interacting Massive Particles. The sub-GeV region, however, in which the masses of the building...
I will report on recent research activities conducted at Chalmers in the field of dark matter particle phenomenology. The dark matter particle phenomenology group at Chalmers performs research on the complementarity of different dark matter search strategies in order to maximise the amount of information which can be extracted from the outcome of present and future dark matter search...
INSIGHTS (International Training Network of Statistics for High Energy
Physics and Society) is an Innovative Training Network (ITN) designed to
train a group of PhD students in statistical methods and machine learning.
Application of these techniques to particle physics and to things such as
finance and decision making is also a key part of the network. This brief
talk gives an introduction to...
Monte Carlo Event Generators are important tools to understand the physics of particle colliders. They play a key role in both the analysis of data collected by experiments and the design of new colliders and detectors. Due to the complexity of particle collisions and the limited ability of perturbative QCD to describe the low energy behavior of partons, we need phenomenological models to...
We investigate the effects of keeping the full color structure for parton emissions in parton showers for both LEP and LHC. This is done within the Herwig 7 dipole shower. The subleading Nc terms are included as color matrix element corrections to the splitting kernels by evolving an amplitude-level density operator and correcting the radiation pattern for each parton multiplicity, up to a...
We have developed an algorithm for recursively constructing orthogonal multiplet bases for the color space of QCD, for any order of partons and any Nc. The basis vectors can be used to calculate Wigner 6j coefficients. These coefficients offer a method of using multiplet bases without resorting to the explicit expressions of the basis vectors, which lead to a significant speed-up compared to...
One of the most precisely measured quantities in particle physics is the anomalous magnetic moment $a_{\mu}=(g_{\mu}-2)/2$, where $g_{\mu}$ is the deviation from the Dirac value $g_{\mu} = 2$. At present, there is roughly a $3\, \sigma$ discrepancy between the value of $a_{\mu}$ calculated in the Standard Model and that experimentally measured at Brookhaven, which could indicate physics beyond...
Perturbative calculations of the effective potential evaluated at a broken minimum, $ V_{\text{min}} $, are plagued by difficulties. Even though this quantity is physical, it is not straightforward to get a finite and gauge invariant result. In fact, the methods proposed to deal with these two issues are orthogonal in their approaches. Gauge dependence is dealt with through the $ \hbar...
