Search For Weakly Interacting Long Lived Particles In Proton Proton Collisions At Square Root Of S PDF Download
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| Author | : Orin Michael Harris |
| Publisher | : |
| Total Pages | : 203 |
| Release | : 2013 |
| Genre | : Higgs bosons |
| ISBN | : |
Download Search for Weakly-interacting Long-lived Particles in Proton-proton Collisions at [square Root Of] S Book in PDF, ePub and Kindle
A search for the decay of a light Higgs boson to a pair of weakly-interacting, long-lived particles in 20.8 fb-1 of proton-proton collisions at [square root of] s = 8 TeV recorded in 2012 by the ATLAS detector is presented. The strategy requires that both of the long-lived particles decay just before or inside the hadronic calorimeter. No statistically significant excess of events is observed above the expected background and limits on the Higgs boson production and branching ratio to weakly-interacting, long-lived particles are derived as a function of the particle's proper decay length.
| Author | : Daniel Wayne Ventura |
| Publisher | : |
| Total Pages | : 145 |
| Release | : 2012 |
| Genre | : Higgs bosons |
| ISBN | : |
Download Search for Weakly-interacting Long-lived Particles in Proton-proton Collisions at [square Root Of] S Book in PDF, ePub and Kindle
A search for the decay of a light Higgs boson to a pair of weakly-interacting, long-lived particles in 1.94/fb of proton-proton collisions at sqrt(s) = 7 TeV recorded in 2011 by the ATLAS detector is presented. The strategy requires that one of the long-lived particles decay inside the muon spectrometer. The second long-lived particle is required to decay after the pixel detector in the inner detector and before the middle plane of the muon spectrometer. No excess of events is observed above the expected background and limits on the Higgs boson production and branching ratio to weakly-interacting, long-lived particles are derived as a function of the particle proper decay length.
| Author | : Daniel Blackburn |
| Publisher | : |
| Total Pages | : 118 |
| Release | : 2015 |
| Genre | : |
| ISBN | : |
Download Search for Weakly-interacting, Long-lived Particles that Decay to Displaced Hadronic Jets in Proton-proton Collisions at Sqrt{s} Book in PDF, ePub and Kindle
A search is presented for the decay of the Standard Model Higgs boson or another scalar boson to a pair of weakly-interacting, long-lived particles in 20.3 fb^{-1} of proton-proton collisions at sqrt{s} = 8 TeV recorded in 2012 by the ATLAS detector. The strategy requires that one of the long-lived particles decay inside the muon spectrometer. The second long-lived particle is required to decay in the inner detector or the muon spectrometer. No excess of events is observed above the expected background. Limits are derived on the scalar boson's production cross section times branching ratio as a function of the long-lived particle's proper decay length.
| Author | : Preema R. Pais |
| Publisher | : |
| Total Pages | : |
| Release | : 2016 |
| Genre | : |
| ISBN | : |
Download Search for Long-lived, Weakly Interacting Particles that Decay to Displaced Hadronic Jets in Proton-proton Collisions at √s Book in PDF, ePub and Kindle
Many new physics models predict the existence of neutral, weakly interacting, long-lived particles that can decay within the detector volume, producing a distinctive experimental signature. A search is performed for a pair of such particles, using proton-proton collision data at √s = 8 TeV collected by the ATLAS detector in 2012, corresponding to a total integrated luminosity of 20.3 fb-1. Novel techniques are developed for the reconstruction of displaced decays to hadronic jets in the inner tracking detector and muon spectrometer. No significant deviation is found from the number of background events expected from Standard Model processes. The data are interpreted in terms of Hidden Valley scenarios with a Z' boson mediator. This dissertation presents the first results for a heavy Z' boson decaying to displaced hadronic jets.
| Author | : |
| Publisher | : |
| Total Pages | : 33 |
| Release | : 2015 |
| Genre | : |
| ISBN | : |
Download Search for Decays of Stopped Long-lived Particles Produced in Proton-proton Collisions at $\sqrt{s} Book in PDF, ePub and Kindle
A search has been performed for long-lived particles that could have come to rest within the CMS detector, using the time intervals between LHC beam crossings. The existence of such particles could be deduced from observation of their decays via energy deposits in the CMS calorimeter appearing at times that are well separated from any proton-proton collisions. Using a data set corresponding to an integrated luminosity of 18.6 fb-1 of 8 TeV proton-proton collisions, and a search interval corresponding to 281 h of trigger livetime, 10 events are observed, with a background prediction of 13.2+3.6 -2.5 events. Limits are presented at 95 % confidence level on gluino and top squark production, for over 13 orders of magnitude in the mean proper lifetime of the stopped particle. Assuming a cloud model of R-hadron interactions, a gluino with mass ≤1000 GeV and a top squark with mass ≤525 GeV are excluded, for lifetimes between 1 μs and 1000 s. Finally, these results are the most stringent constraints on stopped particles to date.
| Author | : Rachel Rosten |
| Publisher | : |
| Total Pages | : 180 |
| Release | : 2017 |
| Genre | : |
| ISBN | : |
Download A Search for Long Lived Neutral Particles Decaying to Hadronic States in Proton-proton Collisions in the ATLAS Detector at Sqrt(s) Book in PDF, ePub and Kindle
A search for the decay of a heavy scalar boson into pairs of long-lived neutral particles in \intlumi of proton proton collisions at $\sqrt{s}=8$~TeV and $3.2~\rm{fb}^{-1}$ at $\sqrt{s}=13$~TeV in the ATLAS detector is presented. The search focuses on final states where both long lived particles decay within the hadronic calorimeter of the detector, resulting in jets with unusual properties. No excess was observed and limits were set on the lifetime of the long lived particles for various combinations of scalar boson and long lived particle masses.
| Author | : |
| Publisher | : |
| Total Pages | : |
| Release | : 2015 |
| Genre | : |
| ISBN | : |
Download Search for Long-lived, Weakly Interacting Particles that Decay to Displaced Hadronic Jets in Proton-proton Collisions at {u221A}s Book in PDF, ePub and Kindle
A search for the decay of neutral, weakly interacting, long-lived particles using data collected by the ATLAS detector at the LHC is presented. This analysis uses the full data set recorded in 2012: 20.3 fb–1 of proton-proton collision data at √s = 8 TeV. The search employs techniques for reconstructing decay vertices of long-lived particles decaying to jets in the inner tracking detector and muon spectrometer. Signal events require at least two reconstructed vertices. No significant excess of events over the expected background is found, and limits as a function of proper lifetime are reported for the decay of the Higgs boson and other scalar bosons to long-lived particles and for Hidden Valley Z' and Stealth SUSY benchmark models. The first search results for displaced decays in Z' and Stealth SUSY models are presented. The upper bounds of the excluded proper lifetimes are the most stringent to date.
| Author | : |
| Publisher | : |
| Total Pages | : |
| Release | : 2015 |
| Genre | : |
| ISBN | : |
Download Search for Long-lived, Weakly Interacting Particles that Decay to Displaced Hadronic Jets in Proton-proton Collisions at [arrow]" Book in PDF, ePub and Kindle
A search for the decay of neutral, weakly interacting, long-lived particles using data collected by the ATLAS detector at the LHC is presented. This analysis uses the full data set recorded in 2012: 20.3 fb-1 of proton-proton collision data at [arrow]" = 8 TeV. The search employs techniques for reconstructing decay vertices of long-lived particles decaying to jets in the inner tracking detector and muon spectrometer. Signal events require at least two reconstructed vertices. No significant excess of events over the expected background is found, and limits as a function of proper lifetime are reported for the decay of the Higgs boson and other scalar bosons to long-lived particles and for Hidden Valley Z' and Stealth SUSY benchmark models. The first search results for displaced decays in Z' and Stealth SUSY models are presented. The upper bounds of the excluded proper lifetimes are the most stringent to date.
| Author | : |
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| Total Pages | : |
| Release | : 2015 |
| Genre | : |
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Download Search for Long-lived Particles that Decay Into Final States Containing Two Electrons Or Two Muons in Proton-proton Collisions at $\sqrt{s} Book in PDF, ePub and Kindle
A search is performed for long-lived particles that decay into final states that include a pair of electrons or a pair of muons. The experimental signature is a distinctive topology consisting of a pair of charged leptons originating from a displaced secondary vertex. Events corresponding to an integrated luminosity of 19.6 (20.5) fb-1 in the electron (muon) channel were collected with the CMS detector at the CERN LHC in proton-proton collisions at √s=8 TeV. No significant excess is observed above standard model expectations. Upper limits on the product of the cross section and branching fraction of such a signal are presented as a function of the long-lived particle's mean proper decay length. The limits are presented in an approximately model-independent way, allowing them to be applied to a wide class of models yielding the above topology. Over much of the investigated parameter space, the limits obtained are the most stringent to date. In the specific case of a model in which a Higgs boson in the mass range 125-1000 GeV/c2 decays into a pair of long-lived neutral bosons in the mass range 20-350 GeV/c2, each of which can then decay to dileptons, the upper limits obtained are typically in the range 0.2-10 fb for mean proper decay lengths of the long-lived particles in the range 0.01-100 cm. In the case of the lowest Higgs mass considered (125 GeV/c2), the limits are in the range 2-50 fb. As a result, these limits are sensitive to Higgs boson branching fractions as low as 10-4.
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| Release | : 2016 |
| Genre | : |
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Download Search for Long-lived Charged Particles in Proton-proton Collisions at [math Display Book in PDF, ePub and Kindle
Results are presented of a search for heavy stable charged particles produced in proton-proton collisions at √s = 13 TeV using a data sample corresponding to an integrated luminosity of 2.5 fb-1 collected in 2015 with the CMS detector at the CERN LHC. The search is conducted using signatures of anomalously high energy deposits in the silicon tracker and long time-of-flight measurements by the muon system. The data are consistent with the expected background, and upper limits are set on the cross sections for production of long-lived gluinos, top squarks, tau sleptons, and lepton-like long-lived fermions. These upper limits are equivalently expressed as lower limits on the masses of new states; the limits for gluinos, ranging up to 1610 GeV, are the most stringent to date. Furthermore, limits on the cross sections for direct pair production of long-lived tau sleptons are also determined.
