After the Higgs: status and prospects of the electroweak fit of the SM and beyond - with Gfitter
Dr Max Baak, CERN, Switzerland
Abstract
Today, all fundamental Standard Model parameters are known and the global electroweak fit is used as a powerful tool to assess the validity of the Standard Model and to constrain scenarios for new physics. We present and discuss the Standard Model predictions of several key observables of the electroweak fit, which are dramatically improved by the knowledge of the Higgs mass. These results are compatible with, and exceed in precision, the direct measurements.
Constraints from the electroweak fit on loop contributions from beyond-SM models are also obtained, through an analysis of the so-called oblique parameters. We discuss the impact of the electroweak fit on Higgs coupling studies and vice versa. Future measurements at the Large Hadron Collider and the International Linear Collider promise to improve the experimental precision of key observables used in the fit. We present the prospects of the global electroweak fit in view of these improvements.
Show speakers
Dr Max Baak, CERN, Switzerland
Dr Max Baak, CERN, Switzerland
In 2007 Max Baak graduated on the measurement of CKM-angle gamma at the BaBar experiment, working for Nikhef. After this he joined the ATLAS experiment. In 2008 he became CERN fellow, focussing on commission work for ATLAS. In particular, he worked in the ATLAS data quality group, on the use of DQ information in ATLAS analyses.
Since 2011 he has been CERN research staff. He has been actively involved in a number of high-profile inclusive ATLAS susy searches. Since late 2009 he has been an active member of the Gfitter group"
An Overview of ATLAS measurements
Dr Kostas Nikolopoulos, University of Birmingham, UK
Abstract
Following the observation of a new boson during the summer of 2012, the ATLAS Collaboration has analysed the complete LHC Run I proton-proton collision dataset of 4.7/fb at the centre-of-mass-energy of 7 TeV and 20.7/fb at 8 TeV. An overview of the most recent results, including both the boson and fermion decay channels will be presented, and the current status of the coupling and spin/CP properties measurements of the Higgs boson will be presented.
Show speakers
Dr Kostas Nikolopoulos, University of Birmingham, UK
Dr Kostas Nikolopoulos, University of Birmingham, UK
"Kostas Nikolopoulos is an experimental particle physicist working on the ATLAS experiment at CERN. His research interests lie in electroweak symmetry breaking and the Higgs sector of the Standard Model (SM) of particle physics. He led the ATLAS H→ZZ group between October 2010 and October 2012, in the effort that resulted in the discovery of a SM-like Higgs boson. Currently, he is focusing in the detailed study of the properties of the newly observed particle. In May 2012, he joined the School of Physics and Astronomy at the University of Birmingham as a Birmingham Fellow."
Higgs Boson Studies at the Tevatron
Dr Jonathan Hays, Queen Mary University of London, UK
Abstract
Run II at the Tevatron ran until September 2011, colliding protons with anti-protons at a centre of mass energy of 1.96 TeV. The combination of results from the CDF and D0 experiments for searches for a Standard Model Higgs boson using an integrated luminosity of
10fb-1 are presented. These are also interpreted in the context of fermiophobic and 4th generation models. An excess of events in the mass range 115 GeV to 140 GeV is observed consistent with the Higgs signal discovered at the LHC.
Show speakers
Dr Jonathan Hays, Queen Mary University of London, UK
Dr Jonathan Hays, Queen Mary University of London, UK
"Dr Hays is currently Lecturer in Particle Physics at Queen Mary University of London. He began his career in particle physics at Imperial College London, in 1996 as a PhD student working on the design and performance of the electromagnetic calorimeter for the CMS experiment, using the diphoton decay of the Higgs as a benchmark process. Upon graduating, he moved out to Chicago to work on the D0 Experiment at the Fermilab Tevatron as a post-doctoral researcher, first for Imperial (2000-2003) and then for Northwestern University (2003-2006). He gained experience on a diverse range of projects from programming for the trigger and data acquisition system to measurements of W and Z boson production. He returned to London to take up a PPARC Advanced Fellowship at Imperial College (2006-2012) working on Higgs searches and the statistical combination of results at the Tevatron and more recently, searching for the Higgs boson in the diphoton channel for the CMS experiment. At Queen Mary since October 2012, he continues his research into the Higgs boson, now on the ATLAS experiment."
Higgs measurements from CMS
Dr Nick Wardle, CERN, Switzerland
Abstract
Since the discovery of a new boson in the summer of 2012, the CMS collaboration have focused attention on understanding the nature of this particle and its interactions. The complete Run 1 dataset corresponding to 4.1/fb and 19.7/fb of proton-proton collisions and centre of mass energies 7 and 8 TeV has been analysed.
The talk will provide an overview of the most recent measurements in both bosonic and fermionic decay Higgs decay channels using the full Run 1 dataset.
Show speakers
Dr Nick Wardle, CERN, Switzerland
Dr Nick Wardle, CERN, Switzerland
"Dr Nicholas Wardle studied high energy physics at Imperial College London and completed his PhD in 2013. After being awarded an STFC STEP grant, he continued research at Imperial College as a Post-doc. He is currently a CERN fellow.
Dr Wardle joined the CMS collaboration at the start of the first run of the LHC in 2010 and was involved in the early measurements of electroweak processes. He joined the Higgs effort early in 2011 as one of the main analysts of the two photon Higgs decay channel and later became involved in Higgs combination efforts and measurements of its properties."
SUSY Higgs bosons
Dr Sasha Nikitenko, Imperial College, UK
Abstract
Several Higgs bosons with masses smaller or larger that 125 GeV are predicted in the best-motivated extension of the Standard Model - supersimmetry (SUSY). I will talk about searches for SUSY Higgs bosons at LHC experiments, ATLAS and CMS with data accumulated during 2010-2013 runs at 7 and 8 TeV and about prospects for the future runs with increased center of mass energy, 13-14 TeV.
I will also talk about searches for the non-standard model decays of the discovered Higgs boson with mass 125 GeV, in particular about decays into Dark Matter particles.
Show speakers
Dr Sasha Nikitenko, Imperial College, UK
Dr Sasha Nikitenko, Imperial College, UK
"Dr Sasha Nikitenko was born in Moscow, Russia. He graduated Moscow Engineering Physical Institute in 1983 and started to work in ITEP (Institute of Theortical and Experimental Physics) in Moscow, where he made hisPhD in 1992 based on analysis of the rare kaon decays with 180 liter xenon bubble chamber.
He joined CMS collaboration in 1992 with ITEP group and participated in the work of Physics, Electron/Photon, Calorimeter Trigger and Tau groups of CMS.
During 2002-2007 he was convener of the CMS Higgs group; convener of H2tau sub-group in 2008-2010 and since 2013 he is convener of Higgs-Exotics sub-group of CMS.
During LHC data taking 2010-2013 he has participated in the searches for SUSY Higgs bosons:
H->2tau, charged Higgs->tan nu and Higgs decays into Dark Matter Particles.
During his life in CMS he has been employed by LIP, Lisbon (1995-1996), CERN as project associate (1996-1998), Saclay DAPNIA/SPP (1998-1999), HIP, Helsinki (1999-2000), CERN as Scientific Associate (2000-2001).
Since 2001 he has been Research Associate in Imperial College, UK."