Tracking B Tagging And Measurement Of The B Jet Production Cross Section With The Atlas Detector
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Measurement of the Inclusive Electron Cross-Section from Heavy-Flavour Decays and Search for Compressed Supersymmetric Scenarios with the ATLAS Experiment
| Author | : Moritz Backes |
| Publisher | : Springer |
| Total Pages | : 268 |
| Release | : 2014-06-11 |
| Genre | : Science |
| ISBN | : 331907136X |
The first part of this thesis presents the measurement of the inclusive cross-section for electron production from heavy-flavour decays in the electron transverse momentum range 7 GeV
A Beauty-ful Boson
| Author | : Giulia Di Gregorio |
| Publisher | : Springer Nature |
| Total Pages | : 229 |
| Release | : 2023-01-01 |
| Genre | : Science |
| ISBN | : 3031200136 |
The analysis described in this thesis is the search for the Higgs boson, decaying into bb pair, in the associated production with a vector boson, in the extreme Higgs boson transverse momentum region where the Higgs boson is reconstructed using the large-R jet technique. The use of the large-R jets allows to add a part of the phase space unexplored so far, which is particularly sensitive to possible new physics. The analysed data have been collected at LHC by the ATLAS detector between 2015 and 2018 at a centre-of-mass energy of √s = 13 TeV. The same dataset has been used to perform the differential pp → ZH and pp → WH cross-section measurements used to extract the information on the Higgs couplings and to put limits on Beyond the Standard Model effects. Furthermore the analysis has been re-used to perform a cross-section measurement of the diboson ZZ and WZ processes because the diboson and the Higgs processes have a similar topology. For the first time the ZZ(bb) and WZ(bb) cross-sections are measured at √s = 13 TeV and the observed cross-section measurements are consistent with the Standard Model predictions.
Third generation SUSY and t ̄t +Z production
| Author | : Josh McFayden |
| Publisher | : Springer |
| Total Pages | : 190 |
| Release | : 2014-06-06 |
| Genre | : Science |
| ISBN | : 3319071912 |
This thesis describes searches for new particles predicted by the super symmetry (SUSY) theory, a theory extending beyond the current Standard Model of particle physics, using the ATLAS detector at the CERN Large Hadron Collider. The thesis focuses on searches for stop and sbottom squarks, the SUSY partners of the top and bottom quarks, which are expected to be lighter than the partners of the first and second generation quarks and therefore good candidates for the first evidence of SUSY. It describes novel techniques for estimating and rejecting the Standard-Model backgrounds to searches for these particles. It also includes an independent analysis seeking to constrain the Standard Model ttZ background process, which also represents the first ATLAS search for this rare process at the LHC. The stop squark analysis described, with substantial leading contributions from the author, is the first search for these particles at the LHC to use the jets plus missing transverse energy plus 0-lepton signature and provides the world's best limits on the stop mass for light neutralino LSPs. All in all, the thesis describes three different world-leading analyses in both Standard Model and SUSY physics and therefore represents a major contribution to the field.
Proceedings of the VIII International Workshop on Hadron Physics 2002
| Author | : Csar A. Z. Vasconcellos |
| Publisher | : World Scientific |
| Total Pages | : 552 |
| Release | : 2003 |
| Genre | : Medical |
| ISBN | : 9812704426 |
This book provides in a pedagogical way some up-to-date reviews of properties of strongly interacting matter produced at RHIC, analytical approaches to QCD, and nuclear and high-energy astrophysics. It also contains schematic outlines of topics on high-precision non-perturbative QCD, first results from RHIC, and heavy-ion collisions at LHC with the ATLAS detector.The proceedings have been selected for coverage in: OCo Index to Scientific & Technical Proceedings (ISTP CDROM version / ISI Proceedings)"
Electroweak Physics at LEP and LHC
| Author | : Arno Straessner |
| Publisher | : Springer |
| Total Pages | : 222 |
| Release | : 2010-03-14 |
| Genre | : Science |
| ISBN | : 3642051693 |
During more than 10 years, from 1989 until 2000, the LEP accelerator and the four LEP experiments, ALEPH, DELPHI, L3 and OPAL, have taken data for a large amount of measurements at the frontier of particle physics. The main outcome is a thorough and successful test of the Standard Model of electroweak interactions. Mass and width of the Z and W bosons were measured precisely, as well as the Z and photon couplings to fermions and the couplings among gauge bosons. The rst part of this work will describe the most important physics results of the LEP experiments. Emphasis is put on the properties of the W boson, which was my main research eld at LEP. Especially the precise determination of its mass and its couplings to the other gauge bosons will be described. Details on physics effects like Colour Reconnection and Bose-Einstein Correlations in W-pair events shall be discussed as well. A conclusive summary of the current electroweak measurements, including low-energy results, as the pillars of possible future ndings will be given. The important contributions from Tevatron, like the measurement of the top quark and W mass, will round up the present day picture of electroweak particle physics. This is an open access book.
Quest For The Origin Of Particles And The Universe - Proceedings Of The Kmi Inauguration Conference
| Author | : Yasumichi Aoki |
| Publisher | : World Scientific |
| Total Pages | : 416 |
| Release | : 2013-03-25 |
| Genre | : Science |
| ISBN | : 9814412333 |
The Kobayashi-Maskawa Institute for the Origin of Particles and the Universe (KMI) was founded at Nagoya University in 2010 under the directorship of T Maskawa, in celebration of the 2008 Nobel Prize in Physics for M Kobayashi and T Maskawa, both who are alumni of Nagoya University. In commemoration of the new KMI building in 2011, the KMI Inauguration Conference (KMIIN) was organized to discuss perspectives of various fields — both theoretical and experimental studies of particle physics and astrophysics — as the main objectives of the KMI activity.This proceedings contains a welcome address by T Maskawa conveying his hopes for KMI to create new revolutionary directions in the spirit of Shoichi Sakata, a great mentor of both Maskawa and Kobayashi. Invited speakers, world-leading scientists in the fields, and the young scientists at KMI contributed to this volume containing theoretical studies of strongly coupled gauge theories in view of LHC phenomenology, string theory approach and lattice studies as well as hot/dense QCD system, and also super-symmetric GUT models, etc., together with experimental studies of LHC physics, B physics, neutrino physics and the related astrophysics and cosmology. The volume yields a unique synergy of particle physics and astrophysics, closely related to the main activity of KMI encompassing particle theory (including lattice computer simulations), particle physics experiments, cosmology, and astrophysics observations.
Particle Physics in the LHC Era
| Author | : Giles Barr |
| Publisher | : Oxford University Press |
| Total Pages | : 422 |
| Release | : 2016 |
| Genre | : Science |
| ISBN | : 0198748558 |
This work covers the required mathematical and theoretical tools required for understanding the Standard Model of particle physics. It explains the accelerator and detector physics which are needed for the experiments that underpin the Standard Model.
