Searches for Long-lived Particles at the Tevatron Collider
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| Total Pages | : 15 |
| Release | : 2008 |
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Searches for Long Lived Particles at the Tevatron
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| Release | : 2008 |
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Several searches have been performed for long lived particles using data collected by the CDF and D0 detectors at the Fermilab Tevatron collider. These include searches for charged massive stable particles, stopped gluinos, neutral long-lived particles decaying to muons, and magnetic monopoles. These proceedings [1] review recent experimental results from Run II analyses.
Review of Physics Results from the Tevatron
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| Release | : 2015 |
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We present a summary of results for searches for new particles and interactions at the Fermilab Tevatron collider by the CDF and the D0 experiments. These include results from Run I as well as Run II for the time period up to July 2014. We focus on searches for supersymmetry, as well as other models of new physics such as new fermions and bosons, various models of excited fermions, leptoquarks, technicolor, hidden-valley model particles, long-lived particles, extra dimensions, dark matter particles, and signature-based searches.
Hearings Before the Committee on Education and Labor, United States Senate, 74. Congress, 1. Sess. on S. 1958
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| Release | : 1935 |
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Search for Heavy, Long-lived Particles that Decay to Photons in $p \bar{p}$ Collisions at $\sqrt{s}$
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| Total Pages | : 248 |
| Release | : 2007 |
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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.
New Particle Searches at the Tevatron (I).
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| Total Pages | : 8 |
| Release | : 1996 |
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Searches for new particles in p{ovr p} collisions at (square root)s = 1.8 TeV are ongoing at the Fermilab Tevatron collider using the CDF and D0 detectors. Current results from searches for heavy charged vector bosons and fourth generation quarks as well as for Supersymmetric partners of Standard Model quarks and gluons are presented. 11 refs., 4 figs.
Search for Resonant Pair Production of Long-lived Particles Decaying to B Anti-b in P Anti-p Collisions at S**ư
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| Total Pages | : 7 |
| Release | : 2009 |
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We report on a first search for production of Higgs bosons decaying into neutral long-lived particles (NLLP) which each decay to a b{bar b} pair, using 3.6 fb−1 of data recorded with the D0 detector at the Fermilab Tevatron collider. We search for pairs of displaced vertices in the tracking detector at radii in the range 1.6-20 cm from the beam axis. No significant excess is observed above background, and upper limits are set on the production rate in a hidden-valley benchmark model for a range of Higgs boson masses and NLLP masses and lifetimes.
Search for a Neutral Long-Lived Particle Decaying to B-Jets
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| Total Pages | : 149 |
| Release | : 2009 |
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The existence of the Higgs boson is required by the Standard Model of particle physics, yet it has not been observed. The precise nature of the Higgs boson is unknown and the mechanism by which it interacts with known Standard Model particles is also not known. Long-lived, electrically neutral hadrons have recently been proposed in hidden-valley models and could constitute a pathway through which the Higgs boson communicates with the Standard Model. Such a scenario may provide a novel path to Higgs discovery at the Tevatron. This thesis describes a search for a neutral, long-lived particle produced in decays of Higgs bosons in p{bar p} collisions at a center-of-mass energy of (square root)s = 1.96 TeV, which decays to b-jets and lives long enough to travel at least 1.6 cm before decaying. This analysis uses 3.65 fb−1 of data recorded with the Run II D0 detector at the Fermilab Tevatron collider from April 2002 to August of 2008. We perform a search for eight possible hidden-valley scenarios resulting from a Higgs decay. No significant excess over background is observed and cross-section limits are placed at 95% CL.
Search for Resonant Pair Production of Long-lived Particles Decaying to B Anti-b in P Anti-p Collisions at S**1/2
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| Total Pages | : 7 |
| Release | : 2009 |
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Download Search for Resonant Pair Production of Long-lived Particles Decaying to B Anti-b in P Anti-p Collisions at S**1/2 Book in PDF, ePub and Kindle
We report on a first search for production of Higgs bosons decaying into neutral long-lived particles (NLLP) which each decay to a b{bar b} pair, using 3.6 fb−1 of data recorded with the D0 detector at the Fermilab Tevatron collider. We search for pairs of displaced vertices in the tracking detector at radii in the range 1.6-20 cm from the beam axis. No significant excess is observed above background, and upper limits are set on the production rate in a hidden-valley benchmark model for a range of Higgs boson masses and NLLP masses and lifetimes.
Search for Heavy, Long-lived Particles that Decay to Photons in Ppbar Collisions at Sqrt(s)
| Author | : Peter Wagner |
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| Total Pages | : |
| Release | : 2010 |
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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 pp̄ 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.
