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A Search for New Physics in Final States With Two Opposite-SignSame-Flavor Leptons, Jets, and Missing Transverse Energy InProton-Proton Collisions with a Center of Mass Energy of 13 TeV

2016
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Release : 2016
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Book Synopsis A Search for New Physics in Final States With Two Opposite-SignSame-Flavor Leptons, Jets, and Missing Transverse Energy InProton-Proton Collisions with a Center of Mass Energy of 13 TeV by : Charles Vincent Welke

Download or read book A Search for New Physics in Final States With Two Opposite-SignSame-Flavor Leptons, Jets, and Missing Transverse Energy InProton-Proton Collisions with a Center of Mass Energy of 13 TeV written by Charles Vincent Welke. This book was released on 2016. Available in PDF, EPUB and Kindle. Book excerpt: A search is performed in final states with Z$\rightarrow\ell\ell$, jets, and missing transverse momentum using data collected with the CMS detector at the CERN LHC in 2015 corresponding to an integrated luminosity of 2.3~\fbinv of pp collisions at $\sqrt{s}=13$\TeV. Signal regions are defined to maximize sensitivity to new physics including one to search where ATLAS reported a 3.0~$\sigma$ excess at 8~TeV. The observations in all regions are consistent with the predicted standard model backgrounds, and the results are interpreted in the context of simplified models of supersymmetry.

Search for New Physics in Final States with Two Opposite-sign, Same-flavor Leptons, Jets, and Missing Transverse Momentum in Pp Collisions at $\sqrt{s}$

2016
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Release : 2016
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Book Synopsis Search for New Physics in Final States with Two Opposite-sign, Same-flavor Leptons, Jets, and Missing Transverse Momentum in Pp Collisions at $\sqrt{s}$ by :

Download or read book Search for New Physics in Final States with Two Opposite-sign, Same-flavor Leptons, Jets, and Missing Transverse Momentum in Pp Collisions at $\sqrt{s}$ written by . This book was released on 2016. Available in PDF, EPUB and Kindle. Book excerpt: A 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 2.3 inverse femtobarns of proton-proton collisions at sqrt(s)=13 TeV collected with the CMS detector at the LHC in 2015. The analysis uses the invariant mass of the lepton pair, searching for a kinematic edge or a resonant-like excess compatible with the Z boson mass. Both search modes use several event categories in order to increase the sensitivity to new physics. These categories are based on the rapidity of the leptons, the multiplicity of jets and b jets, the scalar sum of jet transverse momenta, and missing transverse momentum. In addition, phase space regions are included for which excesses were reported using the sqrt(s)=8 TeV data. A local significance of 2.6 sigma for a kinematic edge search was observed by the CMS Collaboration, and of 3.0 sigma for events compatible with the Z boson mass by the ATLAS Collaboration. The observations in all signal regions are consistent with the expectations from the standard model, and the results are interpreted in the context of simplified models of supersymmetry.

Electroweak Physics at the Large Hadron Collider with the ATLAS Detector

2020-11-03 Science
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Release : 2020-11-03
Genre : Science
Kind : eBook
Book Rating : 169/5 ( reviews)

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Book Synopsis Electroweak Physics at the Large Hadron Collider with the ATLAS Detector by : Elodie Resseguie

Download or read book Electroweak Physics at the Large Hadron Collider with the ATLAS Detector written by Elodie Resseguie. This book was released on 2020-11-03. Available in PDF, EPUB and Kindle. Book excerpt: This thesis discusses searches for electroweakly produced supersymmetric partners of the gauge and the Higgs bosons (gauginos and higgsinos) decaying to multiple leptons, using pp collisions at sqrt(s) = 13 TeV. The thesis presents an in-depth study of multiple searches, as well as the first 13 TeV cross section measurement for the dominant background in these searches, WZ production. Two searches were performed using 36.1/fb of data: the gaugino search, which makes use of a novel kinematic variable, and the higgsino search, which produced the first higgsino limits at the LHC. A search using 139/fb of data makes use of a new technique developed in this thesis to cross check an excess of data above the background expectation in a search using a Recursive Jigsaw Reconstruction technique. None of the searches showed a significant excess of data, and limits were expanded with respect to previous results. These searches will benefit from the addition of luminosity during HL-LHC; however, the current detector will not be able to withstand the increase in radiation. Electronics for the detector upgrade are tested and irradiated to ensure their performance.

Search for Final States with Two Leptons and Missing Transverse Energy in P Anti-p Collisions with a Center-of-mass Energy of 1.96-TeV.

2004
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Release : 2004
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Book Synopsis Search for Final States with Two Leptons and Missing Transverse Energy in P Anti-p Collisions with a Center-of-mass Energy of 1.96-TeV. by : Marc Hohlfeld

Download or read book Search for Final States with Two Leptons and Missing Transverse Energy in P Anti-p Collisions with a Center-of-mass Energy of 1.96-TeV. written by Marc Hohlfeld. This book was released on 2004. Available in PDF, EPUB and Kindle. Book excerpt:

Search for Physics Beyond the Standard Model in Final States with a Lepton and Missing Transverse Energy in Proton-proton Collisions at $\sqrt{s}$

2015
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Release : 2015
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Book Synopsis Search for Physics Beyond the Standard Model in Final States with a Lepton and Missing Transverse Energy in Proton-proton Collisions at $\sqrt{s}$ by :

Download or read book 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 . This book was released on 2015. Available in PDF, EPUB and Kindle. Book excerpt: 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.

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