Search For Physics Beyond The Standard Model In The Trilepton Signature In Bar P P Collisions At Sqrt S
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Search For Physics Beyond The Standard Model In The Trilepton Signature In Bar P P Collisions At Sqrt S
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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 $i{̂pm}_{1} i{̂0}_{2} ightarrow 3ll$ (three leptons) channel. It offers a reasonable signal $sigma x BR$ with very small contributions from Standard Model backgrounds. This thesis, presents a search for chargino-neutralino production within the mSUGRA framework.
Search For Physics Beyond The Standard Model Using Multilepton Signatures In Pp Collisions At Sqrt S
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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 Supersymmetry In Pp Collisions At S 8 Tev With A Photon Lepton And Missing Transverse Energy
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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 Pp Collisions At The Cms Experiment With A Signature Of A Z Boson Plus Missing Transverse Energy
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Author : Ren-Jie Wang
language : en
Publisher:
Release Date : 2016
Search For Physics Beyond The Standard Model In Pp Collisions At The Cms Experiment With A Signature Of A Z Boson Plus Missing Transverse Energy written by Ren-Jie Wang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with Dark matter (Astronomy) categories.
Search For New Physics In Events With Same Sign Dileptons And Jets In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2014
Search For New Physics In Events With Same Sign Dileptons And Jets 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 2014 with categories.
A search for new physics is performed based on events with jets and a pair of isolated, same-sign leptons. The results are obtained using a sample of proton-proton collision data collected by the CMS experiment at a centre-of-mass energy of 8 TeV at the LHC, corresponding to an integrated luminosity of 19.5 inverse femtobarns. In order to be sensitive to a wide variety of possible signals beyond the standard model, multiple search regions defined by the missing transverse energy, the hadronic energy, the number of jets and b-quark jets, and the transverse momenta of the leptons in the events are considered. No excess above the standard model background expectation is observed and constraints are set on a number of models for new physics, as well as on the same-sign top-quark pair and quadruple-top-quark production cross sections. As a result, information on event selection efficiencies is also provided, so that the results can be used to confront an even broader class of new physics models.
The Search For Physics Beyond The Standard Model In The B Bar B Spectrum Observed In Tevatron P Bar P Collisions
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Author :
language : en
Publisher:
Release Date : 1998
The Search For Physics Beyond The Standard Model In The B Bar B Spectrum Observed In Tevatron P Bar P Collisions written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.
Many extensions have been proposed to the Standard Model of fundamental particles and interactions, therefore we have conducted a general search with the Collider Detector at Fermilab (CDF) for particles which would be expected to appear as a resonance in the b$\bar{b}$ mass spectrum produced in proton-antiproton collisions at a center-of-mass energy of √s = 1.8 TeV at the Fermilab Tevatron collider.
Search For Supersymmetry In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2016
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 2016 with categories.
Results are reported from a search for supersymmetric particles in proton-proton collisions in the final state with a single, high transverse momentum lepton; multiple jets, including at least one b-tagged jet; and large missing transverse momentum. The data sample corresponds to an integrated luminosity of 2.3 fb–1 at √s = 13 TeV, recorded by the CMS experiment at the LHC. The search focuses on processes leading to high jet multiplicities, such as gluino pair production with g̃/sup → tt¯X̃/supsup01. The quantity MJ, defined as the sum of the masses of the large-radius jets in the event, is used in conjunction with other kinematic variables to provide discrimination between signal and background and as a key part of the background estimation method. The observed event yields in the signal regions in data are consistent with those expected for standard model backgrounds, estimated from control regions in data. Exclusion limits are obtained for a simplified model corresponding to gluino pair production with three-body decays into top quarks and neutralinos. Gluinos with a mass below 1600 GeV are excluded at a 95% confidence level for scenarios with low Xsup̃/supsup01 mass, and neutralinos with a mass below 800 GeV are excluded for a gluino mass of about 1300 GeV. Lastly, for models with two-body gluino decays producing on-shell top squarks, the excluded region is only weakly sensitive to the top squark mass.
Measurements Of T Bar T Charge Asymmetry Using Dilepton Final States In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2016
Measurements Of T Bar T Charge Asymmetry Using Dilepton Final States 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 2016 with categories.
The charge asymmetry in $t \bar t$ events is measured using dilepton final states produced in pp collisions at the LHC at √s = 8 TeV. The data sample, collected with the CMS detector, corresponds to an integrated luminosity of 19.5 fb-1. The measurements are performed using events with two oppositely charged leptons (electrons or muons) and two or more jets, where at least one of the jets is identified as originating from a bottom quark. The charge asymmetry is measured from differences in kinematic distributions, unfolded to the parton level, of positively and negatively charged top quarks and leptons. The $t \bar t$ and leptonic charge asymmetries are found to be 0.011 ± 0.011 (stat) ± 0.007 (syst) and 0.003 ± 0.006 (stat) ± 0.003 (syst), respectively. Lastly, These results, as well as charge asymmetry measurements made as a function of $t \bar t$ system kinematic properties, are in agreement with predictions of the standard model.
Searches For Physics Beyond The Standard Model In Ttbar Events
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Author :
language : en
Publisher:
Release Date : 2004
Searches For Physics Beyond The Standard Model In Ttbar Events written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
The top quark is currently only observed at the Tevatron, where it is mainly produced in t{bar t} pairs. Due to the very high mass of the top quark compared to the other quarks and the gauge bosons, it is expected to play a special role in electroweak symmetry breaking. Therefore it might be especially sensitive to new physics. Measurements of various production and decay quantities of the top quark could lead to discoveries of physics beyond the standard model. Several such measurements were performed by the CDF collaboration during Run1 of the Tevatron. These measurements and first results from CDF in Run2 are presented.
Search For Physics Beyond The Standard Model In The Opposite Sign Same Flavor Dilepton Final State With The Cms Detector
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Author : Marco-Andrea Buchmann
language : en
Publisher:
Release Date : 2014
Search For Physics Beyond The Standard Model In The Opposite Sign Same Flavor Dilepton Final State With The Cms Detector written by Marco-Andrea Buchmann and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.