Search For New Phenomena In Monophoton Final States In Proton Proton Collisions At Mml PDF Download
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Total Pages | : 23 |
Release | : 2016 |
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Download Search for New Phenomena in Monophoton Final States in Proton-proton Collisions at [mml Book in PDF, ePub and Kindle
In this paper, results are presented from a search for new physics in final states containing a photon and missing transverse momentum. The data correspond to an integrated luminosity of 19.6 fb-1 collected in proton-proton collisions at √s = 8 TeV with the CMS experiment at the LHC. No deviation from the standard model predictions is observed for these final states. New, improved limits are set on dark matter production and on parameters of models with large extra dimensions. In particular, the first limits from the LHC on branon production are found and significantly extend previous limits from LEP and the Tevatron. Finally, an upper limit of 14.0 fb on the cross section is set at the 95% confidence level for events with a monophoton final state with photon transverse momentum greater than 145 GeV and missing transverse momentum greater than 140 GeV.
Author | : Valerio Rossetti |
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Total Pages | : 0 |
Release | : 2013 |
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Download Search for New Phenomena in Events with One Energetic Jet and Large Missing Transverse Momentum in Proton-proton Collisions at √s Book in PDF, ePub and Kindle
Author | : Tia Marie Miceli |
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Release | : 2013 |
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ISBN | : 9781303443381 |
Download Investigations of Standard Model and Exotic Monophoton Signatures at [center of Mass Energy] Book in PDF, ePub and Kindle
This dissertation describes the search for large extra dimensions. Such extra dimensions could solve the hierarchy problem, one of the greatest puzzles in the field of particle physics. The hierarchy problem is the mystery of why gravity is significantly weaker than the electromagnetic, strong, and weak forces. A solution would unify the strength of gravity with the strength of the other forces. There are many possible tests for extra dimensions. Presented is the analysis of proton-proton collisions with final states in which a single photon recoils from an invisible particle. These data were collected with the Compact Muon Solenoid detector during the 2011 Large Hadron Collider run at CERN, in Geneva, Switzerland, and correspond to an integrated luminosity of 5 fb−1 of proton-proton collisions at a center of mass energy of 7 TeV. Backgrounds are estimated using data driven techniques for those due to W [arrow right] [ev] hadronic jets, and non-collision backgrounds such as beam remnants faking a photon, and anomalous energy deposits in the electromagnetic calorimeter. The less significant backgrounds are estimated using Monte Carlo simulation, W[gamma], dijet, and jet + [gamma]. The irreducible Z([nu][nu])+ [gamma] background was estimated in Monte Carlo for the extra dimension search, but in later studies this component should be estimated by using a ratio of the measured Z[gamma] [arrow right] [mu][mu][gamma] cross section. The results are consistent with the predicted Standard Model cross section of Z bosons decaying to neutrino pairs. Subsequently, the worlds best limits are placed on the monophoton topology of large extra dimensions. The same analysis provides a measurement of the Z([nu][nu])+[gamma] cross section consistent with next to leading order predictions.
Author | : You-Hao Chang |
Publisher | : Springer |
Total Pages | : 101 |
Release | : 2018-07-14 |
Genre | : Science |
ISBN | : 9789811099762 |
Download Study of Double Parton Scattering in Photon + 3 Jets Final State Book in PDF, ePub and Kindle
This book mainly focuses on the study of photon + 3 jets final state in Proton-Proton Collisions at √s = 7TeV, searching for patterns of two (or more) distinct hard scatterings in the same collision, i.e the so-called Double Parton Scattering (DPS). A new method by using Monte Carlo generators was performed and provides higher order corrections to the description of the Single Parton Scattering (SPS) background. Further it is investigated whether additional contributions from DPS can improve the agreement between the measured data and the Monte Carlo predictions. The current theoretical uncertainties related to the SPS background are found to be larger than expectation. At the same time a rich set of DPS-sensitive measurements is reported for possible further interpretation.
Author | : Albert M. Sirunyan |
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Total Pages | : |
Release | : 2019 |
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Download Searches for Physics Beyond the Standard Model with the MT2 Variable in Hadronic Final States with and Without Disappearing Tracks in Proton-proton Collisions at √s Book in PDF, ePub and Kindle
Author | : Rachel Paula Yohay |
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Release | : 2012 |
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Download A Search in the Two-photon Final State for Evidence of New Particle Production in Pp Collisions at [square Root] 8 Book in PDF, ePub and Kindle
Author | : David Michael Morse |
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Total Pages | : 121 |
Release | : 2013 |
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Download A Search for New Physics in Events with Two Photons and Missing Transverse Energy in Proton-proton Collisions at Sqrt(s) Book in PDF, ePub and Kindle
Author | : Kevin Patrick McDermott |
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Total Pages | : 206 |
Release | : 2019 |
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Download Search for Long-lived Particles Using Delayed Photons in Proton-proton Collisions at 13 TeV with the CMS Detector Book in PDF, ePub and Kindle
This dissertation presents a search for long-lived particles using delayed photons in proton-proton collisions at sqrt(s) = 13 TeV recorded by the Compact Muon Solenoid (CMS) experiment at the CERN Large Hadron Collider in 2017, corresponding to an integrated luminosity of 41.5 fb^-1. This analysis includes a number of unique components that will be discussed: a dedicated signal trigger, out-of-time photon reconstruction and identification, and a detector time resolution measurement. The results of this search include the combination of a related analysis using data collected in 2016 also at sqrt(s) = 13 TeV, corresponding to a combined integrated luminosity of 77.4 fb^-1. The combined results are interpreted in the context of supersymmetry with gauge-mediated supersymmetry breaking, where the neutralino is long-lived and decays to a photon and a gravitino. Limits are presented as a function of the neutralino proper decay length and mass. For neutralino proper decay lengths of 10^1, 10^2, 10^3, and 10^4 cm, masses up to 320, 525, 360, and 215 GeV are excluded at 95% confidence level, respectively. Additionally, a discussion on a high-performance computing upgrade to CMS, known as mkFit, will be presented. mkFit is an on-going effort to exploit highly parallel computer architectures in vectorizing and parallelizing combinatorial Kalman filter charged particle track reconstruction algorithms. The current physics and computational performance of this project will be discussed.
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Total Pages | : 22 |
Release | : 2015 |
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Download Search for Decays of Stopped Long-lived Particles Produced in Proton-proton Collisions at [arrow]" Book in PDF, ePub and Kindle
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Release | : 1980 |
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Download Study of Direct Single Photons and Correlated Particles in Proton-proton Collisions At. Sqrt. S Book in PDF, ePub and Kindle
As part of a study of large p/sub T/ phenomena in proton-proton collisions at the CERN ISR, a search for direct single photon production has been performed. A statistical division of the data sample into the fraction consistent with single photon production and the fraction due to multiphoton decays of neutral hadrons is accomplished by measuring the average conversion probability for the sample in a one radiation length thick converter. The fraction of the sample attributable to direct single photon production is .gamma./all = 0.074 +- 0.012 for 6 GeV/c = 0.26 +- 0.04 for p/sub T/> 10 GeV/c, with an additional systematic uncertainty of +- 0.05 for both values. It is found that single photons are produced preferentially with no accompanying particles on the same side. The ratio of positive to negative particles on the away side is found to be 3.7 +- 1.2 at high x/sub E/ and p/sub T/ for the single photon events.