Search For Physics Beyond The Standard Model Using Multilepton Signatures In Pp Collisions At Sqrt S
DOWNLOAD
Download Search For Physics Beyond The Standard Model Using Multilepton Signatures In Pp Collisions At Sqrt S PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Search For Physics Beyond The Standard Model Using Multilepton Signatures In Pp Collisions At Sqrt S book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Search Strategies For New Physics At The Lhc
DOWNLOAD
Author : Daniele Spier Moreira Alves
language : en
Publisher: Stanford University
Release Date : 2011
Search Strategies For New Physics At The Lhc written by Daniele Spier Moreira Alves and has been published by Stanford University this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
The LHC is in the frontline of experimental searches for New Physics beyond the Standard Model of Particle Physics. Its power is accompanied by no smaller challenges in analyzing and interpreting its results. In this thesis I explore ways to parameterize new physics phenomena, design search strategies that are sensitive to them, and interpret experimental results in general new physics contexts. In particular, I discuss interpretations of the first ATLAS analysis for supersymmetry with 70/nb of integrated luminosity. I also carry a careful investigation of comprehensive search strategies for new physics with jets and missing energy signatures, and estimate the sensitivity bounds of the 7 TeV LHC to new colored particles decaying to jets and and a neutral particle that escapes detection. Finally, I discuss the implications of the recent LHC excesses hinting to a Higgs boson with mass in the range 142-147 GeV. If confirmed, this range for the Higgs mass will be an important evidence for Split Supersymmetry. I work out the phenomenological predictions of this scenario that will be tested in the very near future by a variety of experiments, including direct and indirect dark matter detection, EDM experiments searching for CP violation and the 7 TeV run of the LHC.
Search For Physics Beyond The Standard Model Using Multilepton Signatures In Pp Collisions At Sqrt S
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 2011
Search For Physics Beyond The Standard Model Using Multilepton Signatures In Pp Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
A search for physics beyond the standard model in events with at least three leptons and any number of jets is presented. The data sample corresponds to 35 inverse picobarns of integrated luminosity in pp collisions at sqrt(s) = 7 TeV collected by the CMS experiment at the LHC. A number of exclusive multileptonic channels are investigated and standard model backgrounds are suppressed by requiring sufficient missing transverse energy, invariant mass inconsistent with that of the Z boson, or high jet activity. Control samples in data are used to ascertain the robustness of background evaluation techniques and to minimise the reliance on simulation. The observations are consistent with background expectations. These results constrain previously unexplored regions of supersymmetric parameter space.
Search For Physics Beyond The Standard Model In Multi Jet Events Recorded With The Atlas Detector In P P Collisions At Square Root Of S
DOWNLOAD
Author : Kuhan Wang
language : en
Publisher:
Release Date : 2015
Search For Physics Beyond The Standard Model In Multi Jet Events Recorded With The Atlas Detector In P P Collisions At Square Root Of S written by Kuhan Wang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
"A search for physics beyond the Standard Model with multi-jet signatures ispresented using 20.3 inverse fb of proton-proton collision data recorded using theATLAS detector at the Large Hadron Collider at a center-of-mass energy of 8 TeV.An original fit and extrapolation technique is used to estimate the QCD multi-jetbackground. No statistically significant deviations from Standard Model predic-tions are observed. The results are interpreted in terms of model-independent lim-its on the fiducial production cross section of multi-jet events and model-dependentlimits in the context of TeV-scale gravity. The fiducial limits at 95% confidence levelon multi-jet production are as low as 0.16 fb and the exclusion power in thresholdmass for black hole and string ball production varies from 4.6 to 6.2 TeV for par-ticular models. These results are amongst the most stringent limits on TeV-scalegravity to date." --
Search For Supersymmetry In Pp Collisions At Sqrt S
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 2011
Search For Supersymmetry In Pp Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Results are reported from a search for physics beyond the standard model in proton-proton collisions at a center-of-mass energy of 7 TeV, focusing on the signature with a single, isolated, high-transverse-momentum lepton (electron or muon), energetic jets, and large missing transverse momentum. The data sample comprises an integrated luminosity of 36 inverse picobarns, recorded by the CMS experiment at the LHC. The search is motivated by models of new physics, including supersymmetry. The observed event yields are consistent with standard model backgrounds predicted using control samples obtained from the data. The characteristics of the event sample are consistent with those expected for the production of t t-bar and W +jets events. The results are interpreted in terms of limits on the parameter space for the constrained minimal supersymmetric extension of the standard model.
Search For Physics Beyond The Standard Model In Events With Two Leptons Jets And Missing Transverse Momentum In Pp Collisions At Sqrt S
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 2015
Search For Physics Beyond The Standard Model In Events With Two Leptons Jets And Missing Transverse Momentum In Pp Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Our search is presented for physics beyond the standard model in final states with two opposite-sign same-flavor leptons, jets, and missing transverse momentum. The data sample corresponds to an integrated luminosity of 19.4 fb-1 of proton-proton collisions at √s = 8 TeV collected with the CMS detector at the CERN LHC in 2012. The analysis focuses on searches for a kinematic edge in the invariant mass distribution of the oppositesign same-flavor lepton pair and for final states with an on-shell Z boson. Furthermore, the observations are consistent with expectations from standard model processes and are interpreted in terms of upper limits on the production of supersymmetric particles.
Search For Supersymmetry In Pp Collisions At S 8 Tev With A Photon Lepton And Missing Transverse Energy
DOWNLOAD
Author : Yutaro Iiyama
language : en
Publisher: Springer
Release Date : 2017-06-14
Search For Supersymmetry In Pp Collisions At S 8 Tev With A Photon Lepton And Missing Transverse Energy written by Yutaro Iiyama and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-06-14 with Science categories.
This Ph.D. thesis is a search for physics beyond the standard model (SM) of particle physics, which successfully describes the interactions and properties of all known elementary particles. However, no particle exists in the SM that can account for the dark matter, which makes up about one quarter of the energy-mass content of the universe. Understanding the nature of dark matter is one goal of the CERN Large Hadron Collider (LHC). The extension of the SM with supersymmetry (SUSY) is considered a promising possibilities to explain dark matter. The nominated thesis describes a search for SUSY using data collected by the CMS experiment at the LHC. It utilizes a final state consisting of a photon, a lepton, and a large momentum imbalance probing a class of SUSY models that has not yet been studied extensively. The thesis stands out not only due to its content that is explained with clarity but also because the author performed more or less all aspects of the thesis analysis by himself, from data skimming to limit calculations, which is extremely rare, especially nowadays in the large LHC collaborations.
Search For Physics Beyond The Standard Model In The Trilepton Signature In Bar P P Collisions At Sqrt S
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 2012
Search For Physics Beyond The Standard Model In The Trilepton Signature In Bar P P Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
The standard model (SM) of particles and fields is a theory that has proven very accurate in the currently accessible collider energies. Nonetheless, the SM is theoretically incomplete in the sense that it leaves many questions and problems unanswered, for example, the origin of electroweak symmetry breaking (EWSB). The Higgs boson is introduced to the SM to provide a mechanism for electroweak symmetry breaking and masses to quarks and leptons. However, the introduction of the Higgs mechanism has the undesirable effect of introducing the hierarchy problem which is characterized by quadratically divergent contributions to the Higgs mass squared. Supersymmetry (SUSY) has been postulated as a way to solve the problem of the fine tuning of the Higgs self-interactions, and additionally to provide a possible mechanism for EWSB. The golden search channel for mSUGRA is the $\chi{^\pm}_{1} \chi^{0}_{2} \rightarrow 3\ell$ (three leptons) channel. It offers a reasonable signal $\sigma \ times BR$ with very small contributions from Standard Model backgrounds. This thesis, presents a search for chargino-neutralino production within the mSUGRA framework.
Search For New Phenomena In Three Or Four Lepton Events In Pp Collisions At Square Root S
DOWNLOAD
Author : [Study Group] ATLAS Collaboration CERN
language : en
Publisher:
Release Date : 2022
Search For New Phenomena In Three Or Four Lepton Events In Pp Collisions At Square Root S written by [Study Group] ATLAS Collaboration CERN and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
Abstract: A search with minimal model dependence for physics beyond the Standard Model in events featuring three or four charged leptons (3l and 4l, ) is presented. The analysis aims to be sensitive to a wide range of potential new-physics theories simultaneously. This analysis uses data from pp collisions delivered by the Large Hadron Collider at a centre-of-mass energy of TeV and recorded with the ATLAS detector, corresponding to the full Run 2 dataset of 139 fb−1. The 3l and 4l phase space is divided into 22 event categories according to the number of leptons in the event, the missing transverse momentum, the invariant mass of the leptons, and the presence of leptons originating from a Z-boson candidate. These event categories are analysed independently for the presence of deviations from the Standard Model. No statistically significant deviations from the Standard Model predictions are observed. Upper limits for all signal regions are reported in terms of the visible cross-section
Search For Physics Beyond The Standard Model In Final States With A Lepton And Missing Transverse Energy In Proton Proton Collisions At Sqrt S
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 2015
Search For Physics Beyond The Standard Model In Final States With A Lepton And Missing Transverse Energy In Proton Proton Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
A search for new physics in proton-proton collisions having final states with an electron or muon and missing transverse energy is presented. The analysis uses data collected in 2012 with the CMS detector, at an LHC center-of-mass energy of 8 TeV, and corresponding to an integrated luminosity of 19.7 fb${̂-1}$. No significant deviation of the transverse mass distribution of the charged lepton-neutrino system from the standard model prediction is found. Mass exclusion limits of up to 3.28 TeV at a 95% confidence level for a W${̂\prime}$ boson with the same couplings as that of the standard model W boson are determined. Results are also derived in the framework of split universal extra dimensions, and exclusion limits on Kaluza-Klein W${̂(2)}_{{\rm KK}}$ states are found. The final state with large missing transverse energy also enables a search for dark matter production with a recoiling W boson, with limits set on the mass and the production cross section of potential candidates. Finally, limits are established for a model including interference between a left-handed W${̂\prime}$ boson and the standard model W boson, and for a compositeness model.
Search For Physics Beyond The Standard Model In Events With Two Leptons Jets And Missing Transverse Momentum In Pp Collisions At U221a S
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 2015
Search For Physics Beyond The Standard Model In Events With Two Leptons Jets And Missing Transverse Momentum In Pp Collisions At U221a S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Our search is presented for physics beyond the standard model in final states with two opposite-sign same-flavor leptons, jets, and missing transverse momentum. The data sample corresponds to an integrated luminosity of 19.4 fb-1 of proton-proton collisions at √s = 8 TeV collected with the CMS detector at the CERN LHC in 2012. The analysis focuses on searches for a kinematic edge in the invariant mass distribution of the oppositesign same-flavor lepton pair and for final states with an on-shell Z boson. Furthermore, the observations are consistent with expectations from standard model processes and are interpreted in terms of upper limits on the production of supersymmetric particles.