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Search For Supersymmetry In Pp Collisions With All Hadronic Final States Using The T Variable With The Cms Detector At The Lhc
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Book Synopsis Search for Supersymmetry in Pp Collisions with All-hadronic Final States Using the [alpha]T Variable with the CMS Detector at the LHC. by : Bryn Lugh Shorney Mathias
Download or read book Search for Supersymmetry in Pp Collisions with All-hadronic Final States Using the [alpha]T Variable with the CMS Detector at the LHC. written by Bryn Lugh Shorney Mathias and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Supersymmetry in Pp Collisions with All-hadronic Final States Using the ΑT Variable with the CMS Detector at the LHC. by : Bryn Lugh Shorney Mathias
Download or read book Search for Supersymmetry in Pp Collisions with All-hadronic Final States Using the ΑT Variable with the CMS Detector at the LHC. written by Bryn Lugh Shorney Mathias and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Advances in Jet Substructure at the LHC by : Roman Kogler
Download or read book Advances in Jet Substructure at the LHC written by Roman Kogler and published by Springer Nature. This book was released on 2021-05-10 with total page 287 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces the reader to the field of jet substructure, starting from the basic considerations for capturing decays of boosted particles in individual jets, to explaining state-of-the-art techniques. Jet substructure methods have become ubiquitous in data analyses at the LHC, with diverse applications stemming from the abundance of jets in proton-proton collisions, the presence of pileup and multiple interactions, and the need to reconstruct and identify decays of highly-Lorentz boosted particles. The last decade has seen a vast increase in our knowledge of all aspects of the field, with a proliferation of new jet substructure algorithms, calculations and measurements which are presented in this book. Recent developments and algorithms are described and put into the larger experimental context. Their usefulness and application are shown in many demonstrative examples and the phenomenological and experimental effects influencing their performance are discussed. A comprehensive overview is given of measurements and searches for new phenomena performed by the ATLAS and CMS Collaborations. This book shows the impressive versatility of jet substructure methods at the LHC.
Book Synopsis Search for Supersymmetry in P-p Collisions at √s by : Kin Ho Lo
Download or read book Search for Supersymmetry in P-p Collisions at √s written by Kin Ho Lo and published by . This book was released on 2018 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The thesis describes a search for new physics in form of supersymmetry in hadronic final states and missing transverse energy (ET) using a dataset of 35.9 fb−1 collected during the 2016 proton-proton runs by the Compact Muon Solenoid (CMS) detector at the Large Hadron Collider (LHC). The search uses robust kinematic variables to suppress backgrounds while maintaining good acceptance to a broad range of signal models and employs data-driven techniques to accurately determine backgrounds and systematic uncertainties. No evidence for Beyond Standard Model (BSM) physics is observed and simplified models are used to interpret the results. For gluino mediated models, the gluino mass up to 1850 GeV and the lightest symmetric particle (LSP) up to 1100 GeV are excluded. For light squark mediated models, the light squark mass up to 1350 GeV (700 GeV) and the LSP up to 650 GeV (400 GeV), assuming no degeneracy in the light squark masses (a degeneracy in light squark masses). For sbottom mediated models, the sbottom mass is excluded to 1075 GeV and the LSP mass up to 550 GeV. For stop mediated models, the stop mass is excluded up to 1075 GeV with the LSP mass up to 400 GeV."--Page x.
Book Synopsis Search for Supersymmetry in Hadronic Final States with Missing Transverse Energy Using the Variables [alpha] T and B-quark Multiplicity in Pp Collisions at $\sqrt{s} by :
Download or read book Search for Supersymmetry in Hadronic Final States with Missing Transverse Energy Using the Variables [alpha] T and B-quark Multiplicity in Pp Collisions at $\sqrt{s} written by and published by . This book was released on 2013 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: An inclusive search for supersymmetric processes that produce final states with jets and missing transverse energy is performed in pp collisions at a centre-of-mass energy of 8 TeV. The data sample corresponds to an integrated luminosity of 11.7 fb-1 collected by the CMS experiment at the LHC. In this search, a dimensionless kinematic variable, [alpha] T, is used to discriminate between events with genuine and misreconstructed missing transverse energy. The search is based on an examination of the number of reconstructed jets per event, the scalar sum of transverse energies of these jets, and the number of these jets identified as originating from bottom quarks. No significant excess of events over the standard model expectation is found. Exclusion limits are set in the parameter space of simplified models, with a special emphasis on both compressed-spectrum scenarios and direct or gluino-induced production of third-generation squarks. For the case of gluino-mediated squark production, gluino masses up to 950-1125 GeV are excluded depending on the assumed model. Finally, for the direct pair-production of squarks, masses up to 450 GeV are excluded for a single light first- or second-generation squark, increasing to 600 GeV for bottom squarks.
Book Synopsis Search for Supersymmetry in the All-hadronic Final State Using Top Quark Tagging in Pp Collisions at Sqrt(s) by :
Download or read book Search for Supersymmetry in the All-hadronic Final State Using Top Quark Tagging in Pp Collisions at Sqrt(s) written by and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A search is presented for supersymmetry in all-hadronic events with missing transverse momentum based on tagging of top quarks. The data sample corresponds to an integrated luminosity of 2.3 inverse femtobarns of proton-proton collisions at a center-of-mass energy of 13 TeV, collected with the CMS detector at the LHC. Search regions are defined using the properties of reconstructed jets, the presence of bottom and top quark candidates, and an imbalance in transverse momentum. With no statistically significant excess of events observed beyond the expected contributions from the standard model, we set exclusion limits at 95% confidence level on the masses of new particles in the context of simplified models of direct and gluino-mediated top squark production. For direct top squark production with decays to a top quark and a neutralino, top squark masses up to 740 GeV and neutralino masses up to 240 GeV are excluded. Gluino masses up to 1550 GeV and neutralino masses up to 900 GeV are excluded for models of gluino pair production where each gluino decays to a top-antitop quark pair and a neutralino.
Book Synopsis Searches for Supersymmetry Using the M$_{T2}$ Variable in Hadronic Events Produced in Pp Collisions at 8 TeV. by :
Download or read book Searches for Supersymmetry Using the M$_{T2}$ Variable in Hadronic Events Produced in Pp Collisions at 8 TeV. written by and published by . This book was released on 2015 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: Searches for supersymmetry (SUSY) are performed using a sample of hadronic events produced in 8 TeV pp collisions at the CERN LHC. The searches are based on the M$_{T2}$ variable, which is a measure of the transverse momentum imbalance in an event. The data were collected with the CMS detector and correspond to an integrated luminosity of 19.5 fb1. Two related searches are performed. The first is an inclusive search based on signal regions defined by the value of the M$_{T2}$ variable, the hadronic energy in the event, the jet multiplicity, and the number of jets identified as originating from bottom quarks. The second is a search for a mass peak corresponding to a Higgs boson decaying to a bottom quark-antiquark pair, where the Higgs boson is produced as a decay product of a SUSY particle. For both searches, the principal backgrounds are evaluated with data control samples. No significant excess over the expected number of background events is observed, and exclusion limits on various SUSY models are derived.
Book Synopsis Searches for Supersymmetry Using the MT2 Variable in Hadronic Events Produced in Pp Collisions at 8 TeV. by :
Download or read book Searches for Supersymmetry Using the MT2 Variable in Hadronic Events Produced in Pp Collisions at 8 TeV. written by and published by . This book was released on 2015 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Searches for supersymmetry (SUSY) are performed using a sample of hadronic events produced in 8 TeV pp collisions at the CERN LHC. The searches are based on the MT2 variable, which is a measure of the transverse momentum imbalance in an event. The data were collected with the CMS detector and correspond to an integrated luminosity of 19.5 fb−1. Two related searches are performed. The first is an inclusive search based on signal regions defined by the value of the MT2 variable, the hadronic energy in the event, the jet multiplicity, and the number of jets identified as originating from bottom quarks. The second is a search for a mass peak corresponding to a Higgs boson decaying to a bottom quark-antiquark pair, where the Higgs boson is produced as a decay product of a SUSY particle. For both searches, the principal backgrounds are evaluated with data control samples. No significant excess over the expected number of background events is observed, and exclusion limits on various SUSY models are derived.
Book Synopsis Phenomena Beyond the Standard Model: What Do We Expect for New Physics to Look Like? by : Roman Pasechnik
Download or read book Phenomena Beyond the Standard Model: What Do We Expect for New Physics to Look Like? written by Roman Pasechnik and published by Frontiers Media SA. This book was released on 2020-09-03 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact.
Book Synopsis Search for Supersymmetry in Pp Collisions at $\sqrt{s}$ by :
Download or read book Search for Supersymmetry in Pp Collisions at $\sqrt{s}$ written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for supersymmetry in hadronic final states with highly boosted W bosons and b jets is presented, focusing on compressed scenarios. The search is performed using proton-proton collision data at a center-of-mass energy of 8 TeV, collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 19.7 fb$^{-1}$. Events containing candidates for hadronic decays of boosted W bosons are identified using jet substructure techniques, and are analyzed using the razor variables $M_\mathrm{R}$ and $R^2$, which characterize a possible signal as a peak on a smoothly falling background. The observed event yields in the signal regions are found to be consistent with the expected contributions from standard model processes, which are predicted using control samples in the data. The results are interpreted in terms of gluino pair production followed by their exclusive decay into top squarks and top quarks. The analysis excludes gluino masses up to 1.1 TeV for light top squarks decaying solely to a charm quark and a neutralino, and up to 700 GeV for heavier top squarks decaying solely to a top quark and a neutralino.
Book Synopsis Search for Supersymmetry in the Jets + Met + TAUS Final State Using the CMS Detector at the LHC by : Roy Joaquin Montalvo
Download or read book Search for Supersymmetry in the Jets + Met + TAUS Final State Using the CMS Detector at the LHC written by Roy Joaquin Montalvo and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this dissertation results are presented from a search for the pair production of heavy colored particles (gluinos, squarks) in R-parity conserving supersymmetric models, in which the lightest supersymmetric particle is a stable and neutral object. The search was performed for events with at least two tau leptons, two highly energetic jets and large missing transverse momentum in the final state on a data sample of proton-proton collisions at sqrt(s) = 7 TeV. The data sample was collected by the Compact Muon Solenoid detector at the Large Hadron Collider in 2011, and it corresponds to an integrated luminosity of 5fb -1. The tau isolation variable was optimized for this search. The number of events corresponding to standard model processes in the final selection was estimated to be 7.49 plus - minus 0.74 using background estimation techniques based on data. Nine observed events are found to be in agreement with the standard model prediction, and exclusion limits on gluino mass are obtained in the context of supersymmetric models at the 95% confidence level. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/149247
Book Synopsis Search for Supersymmetry in Proton-proton Collisions at a Center-of-mass Energy of 13 Tev with a Customized Top Quark Tagger in the All-hadronic Final State by : Hua Wei
Download or read book Search for Supersymmetry in Proton-proton Collisions at a Center-of-mass Energy of 13 Tev with a Customized Top Quark Tagger in the All-hadronic Final State written by Hua Wei and published by . This book was released on 2017 with total page 255 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents a search for direct and gluino-mediated production of supersymmetric scalar top-quark pairs in the all-hadronic final state using top tagging. The result of search is based on a 13 TeV proton-proton sample collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 36 fb-1. The results of the search are interpreted in several Simplified Models (SMS).
Book Synopsis Search for Compressed Supersymmetry at the LHC in Final States with One Hadronic Tau and One Energetic Jet by : Manuel Alejandro Segura Delgado
Download or read book Search for Compressed Supersymmetry at the LHC in Final States with One Hadronic Tau and One Energetic Jet written by Manuel Alejandro Segura Delgado and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present an experimental search of supersymmetry (SUSY) in compressed mass spectra scenarios with scalar taus, using data from proton-proton (pp) collisions in the Large Hadron Collider, LHC, at CERN laboratory, at E=13 TeV, collected by the CMS experiment in 2016 and 2017. Compressed mass spectra scenarios, where the mass difference between the lightest neutralino and the stau is small, have been proposed in several models in order to incorporate coannihilation as a mechanism to obtain a relic dark matter density consistent with that predicted by astronomy. The compressed mass region in SUSY is challenging to probe experimentally. We focus on a final state containing exactly one tau lepton, with low transverse momentum, that has decayed hadronically, at least one initial state radiation jet (ISR) with high momentum, and a large imbalance of missing transverse momentum. An integrated luminosity of 77.2 fb-1 of pp data was used for this analysis. The data was found to be in agreement with respect to the expected background. Therefore, upper limits on the production cross-section as function of chargino mass were set, excluding masses up to 290 GeV for a mass splitting of delta m(stau-neutralino) = 50 GeV. The limits set on this search, constitute the most stringent limits today for all stau's related searches.
Book Synopsis QCD Radiation in Top-Antitop and Z+Jets Final States by : Kiran Joshi
Download or read book QCD Radiation in Top-Antitop and Z+Jets Final States written by Kiran Joshi and published by Springer. This book was released on 2015-06-12 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis contains new research in both experimental and theoretical particle physics, making important contributions in each. Two analyses of collision data from the ATLAS experiment at the LHC are presented, as well as two phenomenological studies of heavy coloured resonances that could be produced at the LHC. The first data analysis was the measurement of top quark-antiquark production with a veto on additional jet activity. As the first detector-corrected measurement of jet activity in top-antitop events it played an important role in constraining the theoretical modelling, and ultimately reduced these uncertainties for ATLAS's other top-quark measurements by a factor of two. The second data analysis was the measurement of Z+2jet production and the observation of the electroweak vector boson fusion (VBF) component. As the first observation of VBF at a hadron collider, this measurement demonstrated new techniques to reliably extract VBF processes and paved the way for future VBF Higgs measurements. The first phenomenological study developed a new technique for identifying the colour of heavy resonances produced in proton-proton collisions. As a by-product of this study an unexpected and previously unnoticed correlation was discovered between the probability of correctly identifying a high-energy top and the colour structure of the event it was produced in. The second phenomenological study explored this relationship in more detail, and could have important consequences for the identification of new particles that decay to top quarks.
Book Synopsis Search for Supersymmetry in Proton-proton Collisions at 7 TeV in Events with a Single Lepton, B-tagged Jets and Missing Transverse Momentum at the LHC Using Data Collected from the CMS Detector by : Wing Howard To
Download or read book Search for Supersymmetry in Proton-proton Collisions at 7 TeV in Events with a Single Lepton, B-tagged Jets and Missing Transverse Momentum at the LHC Using Data Collected from the CMS Detector written by Wing Howard To and published by . This book was released on 2013 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes a search for supersymmetry (SUSY) at the Large Hadron Collider using data collected in Run 2011 at center of mass energy of 7 TeV by the Compact Muon Solenoid detector with an integrated luminosity of 4.98 $fb{-1}$. First, the Large Hadron Collider is briefly described along with the Compact Muon Solenoid detector. Second, the Standard Model of particle physics is described which leads to the motivations for supersymmetry and its description. Finally, a search for supersymmetry in events with a single lepton, 2 b-tagged jets and missing transverse energy is documented in detail. The results are used to predict the yields from the standard model in bins missing transverse energy (\met) and total transverse hadronic energy (HT). Limits are set using these results using a minimal supergravity SUSY model and simplified model spectra SUSY model.
Book Synopsis Search for Supersymmetry in the Multijet and Missing Transverse Momentum Final State in Pp Collisions at 13 TeV. by :
Download or read book Search for Supersymmetry in the Multijet and Missing Transverse Momentum Final State in Pp Collisions at 13 TeV. written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for new physics is performed based on all-hadronic events with large missing transverse momentum produced in proton-proton collisions at sqrt(s)=13 TeV. The data sample, corresponding to an integrated luminosity of 2.3 inverse femtobarns, was collected with the CMS detector at the CERN LHC in 2015. The data are examined in search regions of jet multiplicity, tagged bottom quark jet multiplicity, missing transverse momentum, and the scalar sum of jet transverse momenta. The observed numbers of events in all search regions are found to be consistent with the expectations from standard model processes. Exclusion limits are presented for simplified supersymmetric models of gluino pair production. Depending on the assumed gluino decay mechanism, and for a massless, weakly interacting, lightest neutralino, lower limits on the gluino mass from 1440 to 1600 GeV are obtained, significantly extending previous limits.
Book Synopsis A Search for Supersymmetry in Events with Jets and Missing Momentum Using Data Collected by the CMS Detector at 13 TeV by : Sam Daniel Mullin
Download or read book A Search for Supersymmetry in Events with Jets and Missing Momentum Using Data Collected by the CMS Detector at 13 TeV written by Sam Daniel Mullin and published by . This book was released on 2016 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: As successful as the Standard Model of particle physics has been it still has several major shortcomings which range from unanswered theoretical questions to a lack of any explanation for observed phenomena such as dark matter. One proposed theory for physics beyond the Standard Model which provides solutions for some of these issues is supersymmetry. This dissertation presents a search for supersymmetry using 2.3 fb -1 of proton-proton collision data. This data was collected at a center-of-mass energy of 13 TeV by the CMS detector at the LHC during 2015. This search focuses on top squark pair production where the produced stops both decay to an all hadronic final state. These decays are characterized by multiple jets and missing transverse momentum. A baseline search region is defined to be sensitive to signal processes which occur at rates many orders of magnitude lower than Standard Model processes. The sensitivity to various signal models is improved by dividing this baseline region into distinct categories. Events with an unreconstructed lepton from leptonic W boson decays constitute the primary background. There are also significant contributions from events where a Z boson decays invisibly to neutrinos especially in bins with higher missing transverse momentum. Events with multijet production where one jet has been severely mis-measured as well as those with a pair of top quarks and an invisibly decaying Z boson also have a small presence in the search region. The contributions from these processes to the search region is estimated using data control regions. No statistically significant deviations from the predicted background yields are observed. The results are interpreted in terms of exclusion limits using the Simplified Model Spectrum framework. Stop and neutralino masses are probed up to 780 GeV and 260 GeV respectively.
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