Search for Diphoton Events with Large Missing Transverse Energy in 6.3 Fb-1 of Ppbar Collisions Using the D0 Detector at the Fermilab Tevatron Collider

Search for Diphoton Events with Large Missing Transverse Energy in 6.3 Fb-1 of Ppbar Collisions Using the D0 Detector at the Fermilab Tevatron Collider

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Published: 2010

Total Pages: 157

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A search for diphoton events with large missing transverse energy produced in p{bar p} collisions at √s = 1.96 TeV is presented. The data were collected with the D0 detector at the Fermilab Tevatron Collider between 2002 and 2010, and correspond to 6.3 fb−1 of integrated luminosity. The observed missing transverse energy distribution is well described by the Standard Model prediction, and 95% C.L. limits are derived on two realizations of theories beyond the Standard Model. In a gauge mediated supersymmetry breaking scenario, the breaking scale [Lambda] is excluded for [Lambda]


Search for Diphoton Events with Large Missing Transverse Energy in 6.3 Fb-1 of P$\bar{p}$ Collisions Using the D0 Detector at the Fermilab Tevatron Collider

Search for Diphoton Events with Large Missing Transverse Energy in 6.3 Fb-1 of P$\bar{p}$ Collisions Using the D0 Detector at the Fermilab Tevatron Collider

Author:

Publisher:

Published: 2010

Total Pages: 157

ISBN-13:

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A search for diphoton events with large missing transverse energy produced in p$ar{p}$ collisions at √s = 1.96 TeV is presented. The data were collected with the D0 detector at the Fermilab Tevatron Collider between 2002 and 2010, and correspond to 6.3 fb-1 of integrated luminosity. The observed missing transverse energy distribution is well described by the Standard Model prediction, and 95% C.L. limits are derived on two realizations of theories beyond the Standard Model. In a gauge mediated supersymmetry breaking scenario, the breaking scale ? is excluded for ? 124 TeV. In a universal extra dimension model including gravitational decays, the compactification radius Rsubc/sub is excluded for Rsubc/subsup-1


Search for Diphoton Events with Large Missing Transverse Energy in 6.3 Fb$^{-1}$ of $\mathbf{p\bar{p}}$ Collisions at $\mathbf{\sqrt{s}

Search for Diphoton Events with Large Missing Transverse Energy in 6.3 Fb$^{-1}$ of $\mathbf{p\bar{p}}$ Collisions at $\mathbf{\sqrt{s}

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Published: 2010

Total Pages: 7

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We report a search for diphoton events with large missing transverse energy produced in p{bar p} collisions at √s = 1.96 TeV. The data were collected with the D0 detector at the Fermilab Tevatron Collider, and correspond to 6.3 fb−1 of integrated luminosity. The observed missing transverse energy distribution is well described by the standard model prediction, and 95% C.L. limits are derived on two realizations of theories beyond the standard model. In a gauge mediated supersymmetry breaking scenario, the breaking scale [Lambda] is excluded for [Lambda]


Search for Events with Leptonic Jets and Missing Transverse Energy in $\mathbf{p\bar{p}}$ Collisions at $\mathbf{\sqrt{s}

Search for Events with Leptonic Jets and Missing Transverse Energy in $\mathbf{p\bar{p}}$ Collisions at $\mathbf{\sqrt{s}

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Published: 2010

Total Pages: 7

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We present the first search for pair production of isolated jets of charged leptons in association with a large imbalance in transverse energy in p{bar p} collisions using 5.8 fb−1 of integrated luminosity collected by the D0 detector at the Fermilab Tevatron Collider. No excess is observed above Standard Model background, and the result is used to set upper limits on the production cross section of pairs of supersymmetric chargino and neutralino particles as a function of 'dark-photon' mass, where the dark photon is produced in the decay of the lightest supersymmetric particle.


Search for Gauge Mediated SUSY Breaking in Diphoton Events in Proton Anti-proton Collisions at S**(1/2)

Search for Gauge Mediated SUSY Breaking in Diphoton Events in Proton Anti-proton Collisions at S**(1/2)

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Published: 2005

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The authors present the results of a search for anomalous production of diphoton events with large missing transverse energy using the Collider Detector at Fermilab. In 202 pb[sup -1] of p[bar p] collisions at [radical]s = 1.96 TeV they observe no candidate events, with an expected standard model background of 0.27 [+-] 0.07(stat) [+-] 0.10(syst) events. The results exclude a lightest chargino of mass less than 167 GeV/c[sup 2], and lightest neutralino of 93 GeV/c[sup 2] at 95% confidence level in a gauge-mediated supersymmetry-breaking model with a light gravitino.


Search for Gauge Mediated SUSY Breaking in Diphoton Events in Proton Anti-proton Collisions at S**(1/2)

Search for Gauge Mediated SUSY Breaking in Diphoton Events in Proton Anti-proton Collisions at S**(1/2)

Author: Min Suk Kim

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Published: 2004

Total Pages: 120

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The authors present the results of a search for anomalous production of diphoton events with large missing transverse energy using the Collider Detector at Fermilab. In 202 pb{sup -1} of p{bar p} collisions at {radical}s = 1.96 TeV they observe no candidate events, with an expected standard model background of 0.27 {+-} 0.07(stat) {+-} 0.10(syst) events. The results exclude a lightest chargino of mass less than 167 GeV/c{sup 2}, and lightest neutralino of 93 GeV/c{sup 2} at 95% confidence level in a gauge-mediated supersymmetry-breaking model with a light gravitino.


Search for Gauge Mediated SUSY Breaking in Diphoton Events in Proton Anti-proton Collisions at {u221A}s

Search for Gauge Mediated SUSY Breaking in Diphoton Events in Proton Anti-proton Collisions at {u221A}s

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Published: 2004

Total Pages: 135

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The authors present the results of a search for anomalous production of diphoton events with large missing transverse energy using the Collider Detector at Fermilab. In 202 pb-1 of p$ar{p}$ collisions at √s = 1.96 TeV they observe no candidate events, with an expected standard model background of 0.27 ± 0.07(stat) ± 0.10(syst) events. The results exclude a lightest chargino of mass less than 167 GeV/c2, and lightest neutralino of 93 GeV/c2 at 95% confidence level in a gauge-mediated supersymmetry-breaking model with a light gravitino.


Search for Heavy, Long-lived Particles that Decay to Photons in $p \bar{p}$ Collisions at $\sqrt{s}$

Search for Heavy, Long-lived Particles that Decay to Photons in $p \bar{p}$ Collisions at $\sqrt{s}$

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Published: 2007

Total Pages: 248

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This dissertation presents the results of the first search for heavy, neutral, longlived particles that decay to photons at a hadron collider. We use a sample of +jet+missing transverse energy events in $p \bar{p}$ collisions at √s = 1.96 TeV taken with the Collider Detector at Fermilab. Candidate events are selected based on the arrival time of a high-energy photon at the electromagnetic calorimeter as measured with a timing system that was recently installed. The final result is that we find 2 events, using 570±34 pb-1 of data collected during 2004-2005 at the Fermilab Tevatron, consistent with the background estimate of 1.3±0.7 events. While our search strategy does not rely on model-specific dynamics, we interpret this result in terms of cross section limits in a supersymmetric model with $\vec{X}$$0\atop{1}$ eG and set a world-best e 01 mass reach of 101 GeV/c2 at e = 5 ns. We can exclude any [gamma]+jet+missing transverse energy signal that would produce more than 5.5 events.