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Search for Non-Pointing Photons in the Diphoton and Missing Transverse Energy Final State in 7 TeV Pp Collisions Using the ATLAS Detector

2014
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Release : 2014
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Book Synopsis Search for Non-Pointing Photons in the Diphoton and Missing Transverse Energy Final State in 7 TeV Pp Collisions Using the ATLAS Detector by : Nikiforos Nikiforou

Download or read book Search for Non-Pointing Photons in the Diphoton and Missing Transverse Energy Final State in 7 TeV Pp Collisions Using the ATLAS Detector written by Nikiforos Nikiforou. This book was released on 2014. Available in PDF, EPUB and Kindle. Book excerpt: The gravitinos escape the detector, giving rise to missing energy, while the photons can appear not to originate from the primary vertex of the event, and are measured with a delay with respect to the collision time. No excess was observed above the background expected from Standard Model processes. The results were used to set exclusion limits at 95% CL in the two-dimensional parameter space defined by the supersymmetry breaking scale and the lifetime of the lightest neutralino.

Search for Diphoton Events with Large Missing Transverse Energy in 7 TeV Proton-Proton Collisions with the ATLAS Detector

2013
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Release : 2013
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Book Synopsis Search for Diphoton Events with Large Missing Transverse Energy in 7 TeV Proton-Proton Collisions with the ATLAS Detector by :

Download or read book Search for Diphoton Events with Large Missing Transverse Energy in 7 TeV Proton-Proton Collisions with the ATLAS Detector written by . This book was released on 2013. Available in PDF, EPUB and Kindle. Book excerpt:

Search For Universal Extra Dimensions in the Two Photon and Missing Transverse Energy Final State With The ATLAS Detector

2012
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Release : 2012
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Book Rating : 395/5 ( reviews)

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Book Synopsis Search For Universal Extra Dimensions in the Two Photon and Missing Transverse Energy Final State With The ATLAS Detector by : Baharak Fatholahzadeh

Download or read book Search For Universal Extra Dimensions in the Two Photon and Missing Transverse Energy Final State With The ATLAS Detector written by Baharak Fatholahzadeh. This book was released on 2012. Available in PDF, EPUB and Kindle. Book excerpt:

Search for New Physics in Final States with Low Transverse Energy Photon 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 New Physics in Final States with Low Transverse Energy Photon and Missing Transverse Energy in Proton-proton Collisions at $\sqrt{s} by :

Download or read book Search for New Physics in Final States with Low Transverse Energy Photon 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 the [gamma]+ET nal state is performed using pp collision data corresponding to an integrated luminosity of 7.3 fb-1 collected at √s = 8 TeV using low threshold triggers in a phase space region de ned by ET > 45 GeV and ET > 40 GeV.

Observation of Top-quark Pair Production in Association with a Photon and Measurement of the Tt{u00AF}? Production Cross Section in pp Collisions at {u221A}s

2015
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Release : 2015
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Book Synopsis Observation of Top-quark Pair Production in Association with a Photon and Measurement of the Tt{u00AF}? Production Cross Section in pp Collisions at {u221A}s by :

Download or read book Observation of Top-quark Pair Production in Association with a Photon and Measurement of the Tt{u00AF}? Production Cross Section in pp Collisions at {u221A}s written by . This book was released on 2015. Available in PDF, EPUB and Kindle. Book excerpt: A search is performed for top-quark pairs (tt¯) produced together with a photon (?) with transverse energy greater than 20 GeV using a sample of tt¯ candidate events in final states with jets, missing transverse momentum, and one isolated electron or muon. The data set used corresponds to an integrated luminosity of 4.59 fb−1 of proton-proton collisions at a center-of-mass energy of 7 TeV recorded by the ATLAS detector at the CERN Large Hadron Collider. In total, 140 and 222 tt¯? candidate events are observed in the electron and muon channels, to be compared to the expectation of 79 ± 26 and 120 ± 39 non-tt¯? background events, respectively. The production of tt¯? events is observed with a significance of 5.3 standard deviations away from the null hypothesis. The tt¯? production cross section times the branching ratio (BR) of the single-lepton decay channel is measured in a fiducial kinematic region within the ATLAS acceptance. The measured value is ?fidtt¯? × BR = 63 ± 8(stat)+17–13(syst) ± 1(lumi) fb per lepton flavor, in good agreement with the leading-order theoretical calculation normalized to the next-to-leading-order theoretical prediction of 48 ± 10 fb.

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