Author: Ryne Michael Carbone
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Models of a neutral, narrow scalar boson (spin-0), charged and neutral vector bosons (spin-1) coupling to the Standard Model gauge bosons, and a neutral Randall-Sundrum bulk graviton (spin-2) are considered. The search significantly improves the limits produced in recent searches.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 59
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Book Description
Our search for new resonances decaying to WW, ZZ, or WZ is presented. Final states are considered in which one of the vector bosons decays leptonically and the other hadronically. Results are based on data corresponding to an integrated luminosity of 19.7 fb-1 recorded in proton-proton collisions at √s = 8 TeV with the CMS detector at the CERN LHC. Techniques aiming at identifying jet substructures are used to analyze signal events in which the hadronization products from the decay of highly boosted W or Z bosons are contained within a single reconstructed jet. Upper limits on the production of generic WW, ZZ, or WZ resonances are set as a function of the resonance mass and width. We also increase the sensitivity of the analysis by statistically combining the results of this search with a complementary study of the all-hadronic final state. Upper limits at 95% confidence level are set on the bulk graviton production cross section in the range from 700 to 10 fb for resonance masses between 600 and 2500 GeV, respectively. These limits on the bulk graviton model are the most stringent to date in the diboson final state.
Author: Attilio Picazio
Publisher:
ISBN:
Category :
Languages : en
Pages : 154
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Book Description
Author: Matthias U. Mozer
Publisher: Springer
ISBN: 3319303813
Category : Science
Languages : en
Pages : 121
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Book Description
The book discusses the recent experimental results obtained at the LHC that involve electroweak bosons. The results are placed into an appropriate theoretical and historical context. The work pays special attention to the rising subject of hadronically decaying bosons with high boosts, documenting the state-of-the-art identification techniques and highlighting typical results. The text is not limited to electroweak physics in the strict sense, but also discusses the use of electroweak vector-bosons as tool in the study of other subjects in particle physics, such as determinations of the proton structure or the search for new exotic particles. The book is particularly well suited for graduate students, starting their thesis work on topics that involve electroweak bosons, as the book provides a comprehensive description of phenomena observable at current accelerators as well as a summary of the most relevant experimental techniques.
Author: Roman Kogler
Publisher: Springer Nature
ISBN: 3030728587
Category : Science
Languages : en
Pages : 287
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Book Description
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.
Author: Steven Patrick Alkire
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Irene Zoi
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Robert Les
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
This thesis presents several studies in the search for new physics in the production of electroweak gauge bosons pairs with 36 $fb^{-1}$ of proton-proton collisions measured by the ATLAS detector. Processes with electroweak gauge bosons in the final state are sensitive to new physics which alter the electroweak or Higgs sector of the Standard Model. The studies are conducted in the ``semileptonic" decay channels, where one of the electroweak gauge bosons decays hadronically and the other decays leptonically. The groundwork of these studies is established in a search for a new resonant particle which can decay on-shell to pairs of $W/Z$ bosons in the $\ell\nu qq$ channel. No significant excess of data with respect to the background prediction was observed. Therefore, upper limits at the 95\% CLs confidence level are placed on the possible resonant masses in a strongly coupled Heavy Vector Triplet model and on Bulk Randall-Sundrum Gravitons at 3 TeV and 1.7 TeV, respectively. These results are expanded upon with a dedicated study on an ATLAS-wide combination of resonant diboson and dilepton search results. The combination improves the 95\% CLs upper excluded mass values to 5.5 TeV and 2.1 TeV, respectively. In conjunction, a search for non-resonant new physics is conducted through a measurement of the electroweak vector-boson scattering in all semileptonic channels. Evidence for the process was observed at a significance of $2.7\sigma$ and a fiducial cross-section measurement of $\sigma=45.1\pm8.6\,(\mathrm{stat.})^{+15.9}_{-14.6} \,(\mathrm{syst.})$ fb was extracted, consistent with the Standard Model prediction. Lastly, both the prospects of the $\ell\nu qq$ resonance search and the measurement of vector-boson scattering in the High-Luminosity LHC era were evaluated. With 3000 $fb^{-1}$ of proton-proton data, the upper mass limits on new resonances in the $\ell\nu qq$ channel are expected to increase by 1.3 - 2 TeV depending on the benchmark model and the vector-boson scattering cross-section is expected to be measured at the percent level.
Author: Daniel Stefaniak Nielsen
Publisher:
ISBN:
Category :
Languages : en
Pages : 87
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Book Description
Author: Roman Pasechnik
Publisher: Frontiers Media SA
ISBN: 2889639908
Category : Science
Languages : en
Pages : 180
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Book Description
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.
