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Spaatind 2012 - Nordic Conference on Particle Physics

Jan 2 – 7, 2012
Skeikampen (Norway)
Europe/Copenhagen timezone

Contribution List

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17. Collider Phenomenology at the LHC and Beyond
Prof. Chris Quigg (Fermilab)
1/3/12, 8:30 AM
18. Recent ATLAS results
Prof. Alex Read (University of Oslo)
1/3/12, 3:00 PM
19. Recent CMS results
Prof. Paula Eerola (University of Helsinki)
1/3/12, 4:00 PM
50. An SU(3) parton shower and orthogonal color bases
Dr Malin Sjödahl (Lund University)
1/3/12, 5:30 PM
51. Total Cross Section Measurement with TOTEM at the LHC
Mr Jan Welti (University of Helsinki)
1/3/12, 5:45 PM
52. Resonance searches in multilepton final states
Mr Ask Emil Løvschall-Jensen (Niels Bohr Institute)
1/3/12, 6:00 PM
53. IceCube Solar Dark Matter search and Global SUSY fits with IceCube data
Mr Matthias Danninger (Stockholm University)
1/3/12, 6:15 PM
54. All-loop amplitudes of the Reggeon Field Theory via the stochastic model
Dr Rodion Kolevatov (University of Oslo)
1/3/12, 6:30 PM
55. Tuning MCs using ATLAS boson transverse momentum measurements
Ms Elena Yatsenko (DESY)
1/3/12, 6:45 PM
56. Invariant mass distributions of SUSY cascade decays
Mr Anders Kvellestad (University of Oslo)
1/3/12, 8:00 PM
57. Complex Triple Gauge Boson Couplings
Ms Christine Overgaard Rasmussen (Niels Bohr Institute)
1/3/12, 8:15 PM
58. Tau identification in the ATLAS experiment
Ms Almut Pingel (Niels Bohr Institute)
1/3/12, 8:30 PM
59. Bs studies in the channel J/ψφ at the CMS experiment at LHC
Mr Giacomo Fedi (University of Helsinki)
1/3/12, 8:45 PM
38. Collider Phenomenology at the LHC and Beyond
Prof. Chris Quigg (Fermilab)
1/4/12, 8:30 AM
41. Heavy Ion Physics
Dr Urs Wiedemann (CERN)
1/4/12, 3:00 PM
42. Recent ATLAS results
Prof. Alex Read (University of Oslo)
1/4/12, 4:00 PM
60. Challenges and Perspectives in Quarkonium Polarization Measurements
Ms Ilse Krätschmer (Hephy Vienna)
1/4/12, 5:30 PM
61. Seperation of H to ZZ to 4l from the SM ZZ to 4l background
Mr Lars Egholm Pedersen (Niels Bohr Institute)
1/4/12, 5:45 PM
62. Diagnosis of Supersymmetry Breaking Mediation Schemes by Mass Reconstruction at the LHC
Dr Abram Krislock (Stockholm University)
1/4/12, 6:00 PM
63. Dark Matter Structures In Cosmological Simulations
Mr Martin Sparre (Niels Bohr Institute/Dark Cosmology center)
1/4/12, 6:15 PM
64. Chiral symmetry at high energies
Prof. Johan Bijnens (Lund University)
1/4/12, 6:30 PM
65. Timing performance of the ATLAS calorimeters
Mr Martin Spangenberg (Niels Bohr Institute)
1/4/12, 6:45 PM
66. Searches for mSUGRA in τ channels at ATLAS
Mr Ørjan DALE (University of Bergen)
1/4/12, 8:00 PM
67. Measurement of the W-Boson Mass with the ATLAS Detector at LHC
Mr Bjørn Sorensen (Niels Bohr Institute)
1/4/12, 8:15 PM
68. Modeling the Impact Parameter Dependence of the nPDFs With EKS98 and EPS09 Parametrizations
Mr Ilka Helenius (University of Jyväskylä)
1/4/12, 8:30 PM
69. Search for new gauge bosons and other exotic particles with ATLAS
Mr Magnar Kopangen Bugge (University of Oslo)
1/4/12, 8:45 PM
44. Heavy Ion Physics
Dr Urs Wiedemann (CERN)
1/5/12, 8:30 AM
45. Neutrino Physics
Prof. Wark David (Imperial College London)
1/5/12, 3:00 PM
40. Heavy Ion Physics
Dr Urs Wiedemann (CERN)
1/5/12, 4:00 PM
70. Reconstructing the rest frame of tau+tau- resonances at the LHC
Mr Peter Lundgaard Rosendahl (University of Bergen)
1/5/12, 5:30 PM
73. A model for the color suppressed decay mode B^0 --> 2 \pi^0
Dr Teresa Palmer (University of Oslo)
1/5/12, 5:45 PM
74. Search for light charged Higgs bosons in top-quark decays with the ATLAS experiment
Mr Alexander Madsen (Uppsala University)
1/5/12, 6:00 PM
75. Upper limits on the branching ratio for top decaying to a bottom and a charged Higgs boson
Ms Silje Hattrem Raddum (University of Oslo)
1/5/12, 6:15 PM
71. BSM with new Higgs limits
Mr Helge Pettersen (University of Bergen)
1/5/12, 6:30 PM
72. “Absolute Luminosity For ATLAS” – From installation to first data physics data
Mr Sune Jakobsen (Niels Bohr Institute)
1/5/12, 6:45 PM
76. Jets in a quark-gluon plasma
Dr Konrad Tywoniuk (University of Lund)
1/5/12, 8:00 PM
77. H->gammagamma search at ATLAS
Ms Lillian Smestad (University of Oslo)
1/5/12, 8:15 PM
78. Measuring the 3D shape of galaxy clusters
Mr Andreas Skielboe (Dark Cosmology center)
1/5/12, 8:30 PM
79. IPPOG - outreach activites and resources
Prof. Farid Ould-Saada (University of Oslo), Prof. Johan Rathsman (Lund University)
1/5/12, 8:45 PM
46. Physics at the LHC Upgrade
Prof. Albert De Roeck (CERN & Antwerpen)
1/6/12, 8:30 AM
47. Physics at the LHC Upgrade
Prof. Albert De Roeck (CERN & Antwerpen)
1/6/12, 9:25 AM
48. Collider Phenomenology at the LHC and Beyond
Prof. Chris Quigg (Fermilab)
1/6/12, 3:00 PM
49. Neutrino Physics
Prof. Wark David (Imperial College London)
1/6/12, 4:00 PM
80. Tau Polarisation Measurement in Z Decays in ATLAS
Mr Ingrid Deigaard (HEHI)
1/6/12, 5:30 PM
81. Muon Performance of the ATLAS Detector
Dr Wofgang Liebig (University of Bergen)
1/6/12, 5:45 PM
82. Data driven background estimation in SM H to tau tau
Mr Gorm Galster (Niels Bohr Institute)
1/6/12, 6:00 PM
85. Search for supersymmetry in 2 lepton final states
Mr Eirik Gramstad (University of Oslo)
1/6/12, 6:15 PM
86. ZZ anomalous triple gauge couplings in ATLAS
Mr Kristian Gregersen (Niels Bohr Institute)
1/6/12, 6:30 PM
83. Why and how develop new accelerators?
Prof. Tord Ekelöf (Uppsala University)
1/6/12, 6:45 PM
10. A model for the color suppressed decay mode B^0 --> 2 \pi^0
Teresa Palmer (University of Oslo, Theory Group)
I present a model for the color suppressed decay mode B^0 --> 2 \pi^0. The model is an extension of (heavy-light) chiral quark models. The color suppressed (nonfactorizable) decay mode is obtained in terms of a model dependent gluon condensate. The model can account for the experimental result. Unfortunately, the theoretical result obtained within the model is very sensitive to the two model...
15. All-loop amplitudes of the Reggeon Field Theory via the stochastic model
Dr Rodion Kolevatov (University of Oslo)
The reaction-diffusion (or stochastic) approach is applied to the computation of amplitudes of the Reggeon Field Theory to all orders in the number of Pomeron loops. We develop the numerical calculation technique and use it for computing total, elastic and diffractive proton-proton cross sections for the energies up to the energies of the LHC.
9. An SU(3) parton shower and orthogonal color bases
Dr Malin Sjödahl (Lund University)
Parton showers are essential tools for predicting and understanding LHC results. However, they all rely on a set of approximations, one of them being the approximation of the three colors of nature with infinitely many. In this talk I will present the first results from an SU(3) parton shower in which the radiation is described using full QCD. I will also report on progress in the...
16. Bs STUDIES IN THE CHANNEL J/ψφ IN THE CMS EXPERIMENT AT LHC
Mr Giacomo Fedi (University of Helsinki)
LHC (Large Hadron Collider) is the most powerful particle collider in the world, in which many experiments are installed with the aim of studying physics at high energy. At design level, LHC is able to collide protons with center of mass energy of 14 TeV. One of the main experiments installed at one of the collision points is CMS (Compact Muon Solenoid). The Bs is a meson which is composed of...
6. Challenges and Perspectives in Quarkonium Polarization Measurements
Ilse Krätschmer (Hephy Vienna)
An extensive experimental program using quarkonium production to study QCD in hadron colliders is well under way. Differential cross-sections and spin alignments of the produced quarkonia play a central role and a number of theoretical models has been developed to interpret the measurements. This talk reviews existing polarization measurements and some related challenges. It then describes a...
0. Chiral symmetry at high energies
Prof. Bijnens Bijnens (Lund University)
I will present two new applications of effective field theory. The first one is the predictions of chiral logarithms for processes at high energy with socalled hard pion Chiral perturbation theory. This allows e.g. to make predictions for the light quark mass dependence of semileptonic form-factors in heavy quark decays also away from the endpoint [arXiv:0906.0302, 1006.1197, 1011.6531,...
26. Complex Triple Gauge Boson Couplings
Christine Overgaard Rasmussen (NBI)
Generalized effective lagrangians is the usual method for describing possible deviations from the Standard Model in Di-boson studies. Traditionally the strength of the additional terms in the lagrangian are parametrized by Triple Gauge Boson Couplings (TGCs) assumed to be real. This assumption is not required and I will present a study of complex triple gauge boson couplings using a modified...
22. Dark Matter Structures In Cosmological Simulations
Mr Martin Sparre (NBI/DARK)
In this talk I will give an overview of cosmological simulations of dark matter systems, and give an overview of universal features found in these simulations. I will also discuss the "universal attractor of dark matter haloes", which relates the velocity distribution to the density profile of dark matter systems.
34. Data driven background estimation in SM H to tau tau
Gorm Galster (Student, The Niels Bohr Institute)
The SM Higgs to tau tau decay has two dominating backgrounds: QCD and the irreducible background from Z decay. In the analysis I've been working with we've been trying to estimate both of these from data motivated by the potential of eliminating the systematics from Monte Carlo. I will give a short presentation on the methods used and on my work with the analysis.
27. Diagnosis of Supersymmetry Breaking Mediation Schemes by Mass Reconstruction at the LHC
Dr Abram Krislock (Stockholm University)
If supersymmetry is discovered at the LHC, the next question will be the determination of the underlying model. While this may be challenging or even intractable, a more optimistic question is whether we can understand the main contours of any particular paradigm of the mediation of su- persymmetry breaking. The determination of superpartner masses through endpoint measurements of kinematic...
14. H->gammagamma search at ATLAS
In this talk the H->gammagamma search of ATLAS will be presented. This decay channel is one of the most powerful ones at low values of the Higgs mass. A light Higgs boson is preferred by precision measurements of electroweak processes from various experiments. Results using 4.9 (possibly 5.2)/fb of proton-proton collision data collected during 2011 will be shown. During 2011 data taking, the...
43. Heavy Ion Physics
13. IceCube Solar Dark Matter search and Global SUSY fits with IceCube data
Mr Matthias Danninger (Stockholm University)
IceCube Solar Dark Matter search and Global SUSY fits with IceCube data
4. Invariant mass distributions of SUSY cascade decays
Mr Anders Kvellestad (University of Oslo)
If supersymmetry is discovered at the LHC, the next challenge will be to determine sparticle properties as accurately as possible. For the determination of unknown masses in SUSY cascade decays, methods based on the observed particles' kinematic endpoints have been developed. In order to accurately determine such endpoints, knowledge of the correct theoretical distribution shapes is important....
8. IPPOG - outreach activites and resources
Prof. Farid OULD-SAADA (University of Oslo), Johan Rathsman (Lund University)
We will present IPPOG - the International Particle Physics Outreach Group and some of its activities and resources that it provides. The main emphasis will be on: Masterclasses - where high school students come to the University for one full day to learn about particle physics and analyze real data from the LHC experiments, a new database which collects good examples of materials and other...
25. Jets in a quark-gluon plasma
Dr Konrad TYWONIUK (Lund University)
We describe the coherent QCD radiation off a quark-antiquark antenna traversing a colored medium. Features of the spectrum are discussed and relevant scales of the problem are identified. In particular, the regimes where interference effects prevail are shown to be relevant in light of the data on inclusive jets in heavy-ion collisions at the LHC.
31. Master thesis overview: BSM with new Higgs limits
Mr Helge Pettersen (University of Bergen)
The new Higgs results are close to the expected values for the Standard Model. How will this affect BSM models like Supersymmetry or 2 Higgs Doublet Models?
24. Measurement of the W-Boson Mass with the ATLAS Detector at LHC
Bjørn Sørensen (student)
My Master Thesis is about a mass measurement of the W-boson with the ATLAS detector at LHC. It is a high precision measurement and I have focused on the W to muon channel and the mass measurement from the pT-distribution of the muon.
37. Measuring the 3D shape of galaxy clusters
Mr Andreas Skielboe (Dark Cosmology Centre)
Clusters of galaxies are increasingly exploited as cosmological probes. For accurate measurements of cluster properties it is extremely important to constrain the three-dimensional shape of clusters. If non-spherical components of the X-ray emitting intracluster gas are not taken into account, it is very likely that one will obtain erroneous estimates for cluster mass and gas properties. We...
5. Modeling the Impact Parameter Dependence of the nPDFs With EKS98 and EPS09 Parametrizations
Mr Ilkka Helenius (Department of Physics, University of Jyväskylä)
The knowledge of the parton distribution functions (PDFs) is essential for interpreting any hard-process results from hadronic collisions. For the free proton, the PDFs have been determined with good accuracy from experimental data and DGLAP evolution. However, when colliding heavy ions where the protons are bound to a nuclei, the free proton PDFs cannot be used anymore but the nuclear PDFs...
12. Muon Performance of the ATLAS Detector
Dr Wolfgang Liebig (University of Bergen)
The first two years of p-p collisions at sqrt(s)=7 TeV at LHC have provided a rich data sample with which the muon performance of the ATLAS detector could be measured in high detail. Decays of Z, W and J/psi particles to muons are used, corresponding to an integrated luminosity of 40pb^-1 in 2010 and 2.5fb^-1 in 2011. The muon identification, reconstruction and trigger efficiencies are...
7. Reconstructing the rest frame of tau+tau- resonances at the LHC
Peter Lundgaard Rosendahl (University of Bergen)
At LHC energies bosons such as Z and Higgs bosons will be produced with a large boost wrt. the detector frame. Due to the escaping neutrinos in the tau decay, reconstructing the rest frame of such a heavy boson decaying into a pair of taus is highly non-trivial. I will present a new and simple method for rest frame reconstruction that works for all event topologies and for a large fraction of...
23. Resonance searches in multilepton final states
Mr Ask Emil Løvschall-Jensen (Ph.D. student HEP, NBI)
Global fits using templates can prove to be an interesting approach to finding heavy resonances or deviances from the Standard Model in general. This presentation will shed light on the application of the method for WW, Z->tau tau and ttbar cross section measurements and the possible scopes for multilepton final states.
2. Search for light charged Higgs bosons in top-quark decays with the ATLAS experiment
Mr Alexander Madsen (Uppsala University)
A search for light (90 GeV < m(H+) < 160 GeV) charged Higgs bosons by the ATLAS experiment, based on 1.03/fb of proton-proton collision data at sqrt(s) = 7 TeV using the single-lepton and dilepton channels in ttbar decays with a leptonically decaying tau in the final state is presented.
11. Search for new gauge bosons and other exotic particles with ATLAS
Mr Magnar Kopangen Bugge (University of Oslo)
The ATLAS detector has been used to search for exotic particles in final states with one lepton and missing transverse momentum and final states with a lepton pair. I will present results from analyses of around 1/fb of proton-proton data for both searches. I will describe the motivation for carrying out such searches, explain some of the details of the analyses, and present the final...
36. Searches for mSUGRA in τ channels at ATLAS
Searches for mSUGRA models with τ-rich signatures in the τ − χ coannihilation region, using 2010 data as a training ground in preparation for analyses with the full 2011 data set is presented. The models are chosen such that they are compatible with cosmological bounds. The analysis presents data collected in 2010 and compares to signal and background MC simulations. After a basic...
28. Seperation of H to ZZ to 4l from the SM ZZ to 4l background
Mr Lars Egholm Pedersen (Niels Bohr Institute)
The standard model production of a ZZ diboson is considered an irriducible background to the potential production of H to ZZ. Considering the 4 lepton final state I have in my work investigated if a seperation between the two could be obtained using mass independent distributions. While the Higgs boson is produced mainly from gluon fusion and has zero spin, the standard model ZZ diboson...
33. Tau identification in the ATLAS experiment
Almut Pingel (PhD at NBI)
Tau leptons play an important role in Higgs searches and in searches for physics beyond the Standard Model. Therefore, an efficient identification of low and high energetic tau leptons is necessary which is also robust under conditions with multiple interations per bunch crossing (pileup). In the talk, an overview over the current tau identification with the ATLAS detector will be given.
32. Tau Polarisation Measurement in Z Decays in ATLAS
Ms Ingrid Deigaard (HEP)
Tau leptons can be used to measure the parity violation in the electroweak theory. I will present a study of the polarisation of the Z-boson using tau decays at the ATLAS detector at the Large Hadron Collider, CERN.
21. Timing performance of the ATLAS calorimeters
Mr Martin Spangenberg (Master student)
In my talk I will present an analysis of the timing performance in the ATLAS Tile and Liquid Argon calorimeters using Z->mumu data, the results of which are used in the calibration of speed/beta measurements in the search for stable massive particles (SMPs). Several methods for weighting the beta measurements from individual calorimeter cells will be discussed, as well as methods for data...
1. Total Cross Section Measurement with TOTEM at the LHC
Mr Jan Welti (University of Helsinki)
The TOTal Elastic and diffractive cross section Measurement (TOTEM) experiment [1] at the Large Hadron Collider (LHC) is an experiment specialized in forward physics. The main goals include a precise measurement of the total proton-proton cross section as well as cross sections for elastic and different inelastic processes (single, double and central diffractive). In addition to the cross...
30. Tuning MCs using ATLAS boson transverse momentum measurements
Ms Elena Yatsenko (ATLAS DESY)
Recent ATLAS Z pT and W pT measurements are used to tune MC descriptions in Pythia and POWHEG MC simulations. The results for the Pythia6 shower tune and Pythia6+POWHEG studies on ATLAS Z pT data are presented.
29. Upper limits on the branching ratio for top decaying to a bottom and a charged Higgs boson
Ms Silje Hattrem Raddum (University of Oslo)
Based on 1.03 fb-1 of proton-proton collision data at sqrt(s) = 7 TeV recorded with the ATLAS detector, upper limits on the branching ratio of top decaying to a bottom and a charged Higgs were extracted by performing a profile likelihood statistical analysis. Using the single- and di-lepton channels with leptonically decaying tau(s) in the final state, we found that data agree well with the...
20. Why and how develop new accelerators?
After a pioneering period 1920-1960 accelerator development has been the domain, not of HEP researchers, but of accelerator specialists who primarily see the new accelerators themselves as the interesting objects, not also their use for physic research. Certainly, accelerator technology specialists are absolutely necessary for the development of new accelerators, but one can now also see a...
3. “Absolute Luminosity For ATLAS” – From installation to first data physics data
Mr Sune Jakobsen (Niels Bohr Institute / CERN)
The ALFA detector system (Absolute Luminosity For ATLAS) aims for measuring the absolute LHC luminosity with high precision by using pp-scattering under small angles. Scintillating fibers tracking detectors are positioned 240 m from LHC interaction point 1 inside Roman Pots at millimeter distance from the LHC beam axis. The detectors consist of layers of 64 scintillating square fibers of 500...
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