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Search for Weakly-interacting Long-lived Particles in Proton-proton Collisions at [square Root Of] S

2012 Higgs bosons
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Release : 2012
Genre : Higgs bosons
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Book Synopsis Search for Weakly-interacting Long-lived Particles in Proton-proton Collisions at [square Root Of] S by : Daniel Wayne Ventura

Download or read book Search for Weakly-interacting Long-lived Particles in Proton-proton Collisions at [square Root Of] S written by Daniel Wayne Ventura. This book was released on 2012. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Search for Weakly-interacting Long-lived Particles in Proton-proton Collisions at [square Root Of] S

2013 Higgs bosons
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Release : 2013
Genre : Higgs bosons
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Book Synopsis Search for Weakly-interacting Long-lived Particles in Proton-proton Collisions at [square Root Of] S by : Orin Michael Harris

Download or read book Search for Weakly-interacting Long-lived Particles in Proton-proton Collisions at [square Root Of] S written by Orin Michael Harris. This book was released on 2013. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Search for Weakly-interacting, Long-lived Particles that Decay to Displaced Hadronic Jets in Proton-proton Collisions at Sqrt{s}

2015
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Release : 2015
Genre :
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Book Synopsis Search for Weakly-interacting, Long-lived Particles that Decay to Displaced Hadronic Jets in Proton-proton Collisions at Sqrt{s} by : Daniel Blackburn

Download or read book Search for Weakly-interacting, Long-lived Particles that Decay to Displaced Hadronic Jets in Proton-proton Collisions at Sqrt{s} written by Daniel Blackburn. This book was released on 2015. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Search for Long-lived, Weakly Interacting Particles that Decay to Displaced Hadronic Jets in Proton-proton Collisions at √s

2016
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Release : 2016
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Book Synopsis Search for Long-lived, Weakly Interacting Particles that Decay to Displaced Hadronic Jets in Proton-proton Collisions at √s by : Preema R. Pais

Download or read book Search for Long-lived, Weakly Interacting Particles that Decay to Displaced Hadronic Jets in Proton-proton Collisions at √s written by Preema R. Pais. This book was released on 2016. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Search for Decays of Stopped Long-lived Particles Produced in Proton-proton Collisions at $\sqrt{s}

2015
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Release : 2015
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Book Synopsis Search for Decays of Stopped Long-lived Particles Produced in Proton-proton Collisions at $\sqrt{s} by :

Download or read book Search for Decays of Stopped Long-lived Particles Produced 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 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.

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