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Search for New Phenomena in Monophoton Final States in Proton-proton Collisions at [mml

2016
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Release : 2016
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Book Synopsis Search for New Phenomena in Monophoton Final States in Proton-proton Collisions at [mml by :

Download or read book Search for New Phenomena in Monophoton Final States in Proton-proton Collisions at [mml written by . This book was released on 2016. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Search for New Phenomena in Events with One Energetic Jet and Large Missing Transverse Momentum in Proton-proton Collisions at √s

2013
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Release : 2013
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Book Synopsis Search for New Phenomena in Events with One Energetic Jet and Large Missing Transverse Momentum in Proton-proton Collisions at √s by : Valerio Rossetti

Download or read book Search for New Phenomena in Events with One Energetic Jet and Large Missing Transverse Momentum in Proton-proton Collisions at √s written by Valerio Rossetti. This book was released on 2013. Available in PDF, EPUB and Kindle. Book excerpt:

Investigations of Standard Model and Exotic Monophoton Signatures at [center of Mass Energy]

2013
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Release : 2013
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Kind : eBook
Book Rating : 381/5 ( reviews)

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Book Synopsis Investigations of Standard Model and Exotic Monophoton Signatures at [center of Mass Energy] by : Tia Marie Miceli

Download or read book Investigations of Standard Model and Exotic Monophoton Signatures at [center of Mass Energy] written by Tia Marie Miceli. This book was released on 2013. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Study of Double Parton Scattering in Photon + 3 Jets Final State

2018-07-14 Science
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Release : 2018-07-14
Genre : Science
Kind : eBook
Book Rating : 762/5 ( reviews)

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Book Synopsis Study of Double Parton Scattering in Photon + 3 Jets Final State by : You-Hao Chang

Download or read book Study of Double Parton Scattering in Photon + 3 Jets Final State written by You-Hao Chang. This book was released on 2018-07-14. Available in PDF, EPUB and Kindle. Book excerpt: 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.

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

2019
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Release : 2019
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Book Synopsis 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 by : Albert M. Sirunyan

Download or read book 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 written by Albert M. Sirunyan. This book was released on 2019. Available in PDF, EPUB and Kindle. Book excerpt:

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