II. Physikalisches Institut
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Oberseminar des II. Physikalischen Instituts

Termin: freitags, 10:30 - 11:30 Uhr, Seminarraum 7 (C.01.101)
Kontaktperson: Diogo Franzosi (dbuarqu *at* gwdg.de)
Dozentinnen/Dozenten: A. Frey, H. Hofsäss, S. Schumann, A. Quadt, S. Lai

Oberseminar im SoSe 2017

DateSpeakerAffiliationTitle (click for abstract)
21.04.2017 Jörn Grosse-Knetter II. Physikalisches Institut Sicherheitsbelehrung - Safety Briefing
28.04.2017 Florian Bernlochner Univ. of Bonn Belle II and the flavour frontier of the search for New Physics
Belle II is a future flavour factory that will produce large numbers of B-Mesons and study their decay. Such precision studies are complementary to new physics searches at the LHC and in the precision laboratory provided by the Belle II detector, new physics can be probed to scales beyond the direct detection potential of the ATLAS and CMS experiments. Belle II will record first collisions in 2018 and I'll provide a brief overview in what analyses Bonn will be involved using first data and beyond. In addition, I'll provide details on the physics focus of my Emmy Noether group and give a sneak peak on interesting theory and analysis projects I'm involved in.

Download the presentation slides (link to Indico)
05.05.2017 Mathieu Pellen Univ. of Würzburg NLO corrections for processes involving off-top quarks at the LHC
With Run II, the Large Hadron Collider (LHC) is entering the precision era. In order to match the experimental measurements, precise and appropriate theoretical predictions should be computed. In that respect, the assessment of electroweak (EW) corrections and off-shell effects for Standard Model (SM) processes is of prime importance. EW corrections can grow large in particular phase space regions which are usually the one where new physics is expected to appear. This makes them particularly relevant for precise SM measurements as well as for SM background estimate in new physics searches. In addition to allow for a direct comparison with experiments, off-shell computations provide realistic estimate of the high energy tail of distributions. The latter will be probed during Run II thanks to a never accessed centre-of-mass energy. To illustrate this, I present two recent computations where NLO EW corrections have been calculated for processes involving off-shell top quarks: the production of top-quark pairs decaying fully leptonically and the same production process in association with a Higgs Boson. In this two examples, I discuss the impact of EW corrections and off-shell effects.

Download the presentation slides (link to Indico)
12.05.2017 Johannes Albrecht Univ. of Dortmund Challenging the Standard Model with LHCb data
The LHCb experiment at CERN has in the past years recorded the world's largest sample of beauty mesons. Their decays can be precisely measured with the LHCb detector, thanks to its unique geometry as forward spectrometer. Rare leptonic and semi- leptonic beauty decays are excellent probes for yet unknown heavy particles. Measurements of decay rates and angular distributions of these processes can be used to test the Standard Model of particle physics with unprecedented sensitivity. This seminar puts a focus on recent measurements of the LHCb collaboration, including a discussion of the recent tensions in tests of lepton flavour universality.

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19.05.2017 Sergio Diez Cornell DESY Hamburg The new silicon microstrip detector of the ATLAS ITk tracker
The inner detector of the present ATLAS detector has been designed and developed to function in the environment of the present Large Hadron Collider (LHC). At the next-generation tracking detector proposed for the High Luminosity LHC (HL-LHC), the so-called ATLAS Phase-II Upgrade, the particle densities and radiation levels will be higher by as much as a factor of ten. The new detectors must be faster, they need to be more highly segmented, and covering more area. They also need to be more resistant to radiation, and they require much greater power delivery to the front-end systems. At the same time, they cannot introduce excess material which could undermine performance. For those reasons, the inner tracker of the ATLAS detector must be redesigned and rebuilt completely. The design of the ATLAS Upgrade inner tracker (ITk) has already been defined. It consists of several layers of silicon particle detectors. The innermost layers will be composed of silicon pixel sensors, and the outer layers will consist of silicon microstrip sensors.

The talk will be focused on the strip region of the ITk. The central part of the strips tracker (the "barrel") will be composed of rectangular "short" (~ 2.5 cm) and "long" (~5 cm) strip sensors. The forwards regions of the strips tracker (the "endcaps") consist of 6 disks per side, with trapezoidal shaped microstrip sensors of various lengths and strip pitches. In response to the needs of the strip region for the ITk, highly modular structures are being studied and developed, called "staves" for the central region (barrel) and "petals" for the forward regions (end-caps). These structures integrate large numbers of sensors and readout electronics, with precision light weight mechanical elements and cooling structures. The silicon modules are directly glued onto low-mass, carbon fiber-based stave and petal core structures, with embedded titanium cooling pipes and data and power buses. The staves and petals are then arranged into cylinders and disks, respectively, by means of the integration and global structures. The service module elements, part of the global structure, provide data, power, and cooling to groups of petals and staves. A strong prototyping effort has been put in place over the course of the last years in order to optimize the design and construction methods of the ATLAS Strips ITk tracker. The Collaboration reached an important milestone recently with release of the ATLAS Strips ITk Technical Design Report (TDR).

The instrumentation effort in the ATLAS group at DESY focuses on the end-cap region of the strips tracker. A fully instrumented end-cap will be assembled and tested at DESY. The end-cap will then be transported to CERN for its final installation and commissioning. The talk will also detail the infrastructure and QA/QC methods envisioned for this challenging task.

Download the presentation slides (link to Indico)
02.06.2017 Dan Guest UC Irvine und CERN T.B.A. (machine learning techniques in particle physics)
09.06.2017 Steffen Schaepe (T.B.C.) Univ. of Bonn T.B.A. (SUSY searches)
23.06.2017 Darren Scott IPPP Durham T.B.A. (ttbar+NNLL)
30.06.2017 Andrea Knue MPI for Physics, Munich T.B.A. (top quark properties)
07.07.2017 Christian Grefe Univ. of Bonn T.B.A. ( H->tau tau searches)
14.07.2017 BSc Students II. Physikalisches Institut Presentation of their thesis projects

Vergangene Semester

Wintersemester 2016/17

21.10.2016 Hans Hofsäss II. Physikalisches Institut Sicherheitsbelehrung - Radiation Safety Briefing
28.10.2016 Flavia Dias University of Edinburgh Fast simulation/ new physics
04.11.2016 Frank Siegert University of Dresden A practical guide to event generation for prompt photon production
02.12.2016 Quentin Buat Simon Fraser University TBA
09.12.2016 Arnaud Ferrari University of Uppsala Searches for beyond-the-Standard Model Higgs bosons in ATLAS
16.12.2016 Felipe Bregonlin II. Physikalisches Institut Development of an efficient high current ion source for Accelerator Mass Spectrometry
13.01.2017 Tobias Flick Universität Wuppertal Phase-2 upgrade of the ATLAS tracker readout
20.01.2017 Ben Nachman Lawrence Berkeley National Laboratory Grand Challenges for Jet Substructure
20.01.2017 Juergen Reuter DESY Searching New Particles in Vector Boson Scattering at the LHC
03.02.2017 Steve Muanza Marseille University Using integral and differential charge asymmetries in searches for BSM physics at the LHC

Sommersemester 2016

15.04.2016 Jörn Grosse-Knetter II. Physikalisches Institut Sicherheitsbelehrung - Safety Briefing
22.04.2016 Peter Wagner University of Bonn Particle Flow Reconstruction of Tau Lepton Decays and Analysis Prospects
29.04.2016 Tobias Bisanz II. Physikalisches Institut Code Quality: Modern C++
13.05.2016 Joshua Wyatt Smith II. Physikalisches Institut Code Quality 2
20.05.2016 Louis Helary Boston University and CERN Review of recent Electroweak results from the LHC
03.06.2016 Marek Schoenherr University of Zürich Electroweak corrections for the LHC
17.06.2016 Alexander Oh University of Manchester 3D diamond detectors for particle tracking and dosimetry
24.06.2016 Volker Metag Justus-Liebig-Universität Gießen Experimental tests of QCD at the low energy frontier
01.07.2016 Mads Frandsen CP3-Origins, Southern University of Denmark Dynamical electroweak symmetry breaking in light of LHC results
08.07.2016 Christoph Englert Glasgow University Effective Theories at the LHC
15.07.2016 BSc Students II. Physikalisches Institut Presentation of their thesis projects

Wintersemester 2015/16

30.10.2015 Hans Hofsäss II. Physikalisches Institut Sicherheitsbelehrung - Radiation Safety Briefing
13.11.2015 Christian Grefe Bonn University Higgs physics at linear colliders
04.12.2015 Jennifer Thompson II. Physikalisches Institut Electroweak corrections in Monte Carlo simulations
11.12.2015 Christoph Falk Anders Ruprecht-Karls-Universitaet Heidelberg Boosted top quark reconstruction and searches with boosted objects at ATLAS
15.01.2016 Jason Veatch II. Physikalisches Institut A search for ttbar resonances: 1-lepton channel
22.01.2016 Pier Monni University of Oxford Event shape resummation and/or jet vetoes
05.02.2016 Marie-Hélène Genest CNRS LPSC Grenoble Searches for Dark Matter and Extra Dimensions with mono-X signatures at ATLAS
12.02.2016 Hans Peter Beck University of Bern Higgs Boson - Year four after its discovery

Sommersemester 2015

24.04.2015 Jörn Grosse-Knetter II. Physikalisches Institut Sicherheitsbelehrung - Safety Briefing
08.05.2015 Nathan Hartland University of Oxford Parton distributions for the LHC
15.05.2015 Matthias Hamer CBPF - Brazilian Center for Physics Research A Global Fit of the CMSSM after the LHC Run I
22.05.2015 Iacopo Vivarelli University of Sussex Searches for 3rd generation SUSY particles
29.05.2015 Lorenzo Bianchini ETH Zurich MEM for the ttH search in CMS
05.06.2015 Susanne Kuehn Albert-Ludwigs-Universitaet Freiburg Silicon Strip Detectors for the ATLAS upgrade project
19.06.2015 Rebeca Gonzalez Suarez University of Nebraska Overview of single top physics in CMS with Run-1 data
26.06.2015 Yves Kemp DESY Interactive Analysis Facilities: from NAF to NAF 2.0
03.07.2015 Silke Merchel Helmholtz-Zentrum Dresden-Rossendorf Cutting-edge analytics at DREAMS: Cool application stuff using tandem accelerators
17.07.2015 BSc students II. Physikalisches Institut Presentation of their thesis projects