Search For Nonpointing And Delayed Photons In The Diphoton And Missing Transverse Momentum Final State In 8 Tev Math Display
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Search For Nonpointing And Delayed Photons In The Diphoton And Missing Transverse Momentum Final State In 8 Tev Math Display
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Author :
language : en
Publisher:
Release Date : 2014
Search For Nonpointing And Delayed Photons In The Diphoton And Missing Transverse Momentum Final State In 8 Tev Math Display written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
We performed a search, using the full 20.3 fb1 data sample of 8 TeV proton-proton collisions collected in 2012 with the ATLAS detector at the LHC, for photons originating from a displaced vertex due to the decay of a neutral long-lived particle into a photon and an invisible particle. The analysis investigates the diphoton plus missing transverse momentum final state, and is therefore most sensitive to pair production of long-lived particles. The analysis technique exploits the capabilities of the ATLAS electromagnetic calorimeter to make precise measurements of the flight direction, as well as the time of flight, of photons. No excess is observed over the Standard Model predictions for background. Lastly, exclusion limits are set within the context of gauge mediated supersymmetry breaking models, with the lightest neutralino being the next-to-lightest supersymmetric particle and decaying into a photon and gravitino with a lifetime in the range from 250 ps to about 100 ns.
Search For Non Pointing Photons In The Diphoton And Missing Transverse Energy Final State In 7 Tev Pp Collisions Using The Atlas Detector
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Author : Nikiforos Nikiforou
language : en
Publisher:
Release Date : 2014
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 and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
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 Non Prompt Photons In A Diphoton And Large Missing Transverse Momentum Final State At The Atlas Detector
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Author : Allan Lehan
language : en
Publisher:
Release Date : 2015
Search For Non Prompt Photons In A Diphoton And Large Missing Transverse Momentum Final State At The Atlas Detector written by Allan Lehan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Search For New Phenomena In Monophoton Final States In Proton U2013 Proton Collisions At
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Author :
language : en
Publisher:
Release Date : 2016
Search For New Phenomena In Monophoton Final States In Proton U2013 Proton Collisions At written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
In this paper, results are presented from a search for new physics in final states containing a photon and missing transverse momentum. The data correspond to an integrated luminosity of 19.6 fb-1 collected in proton–proton collisions at √s = 8 TeV with the CMS experiment at the LHC. No deviation from the standard model predictions is observed for these final states. New, improved limits are set on dark matter production and on parameters of models with large extra dimensions. In particular, the first limits from the LHC on branon production are found and significantly extend previous limits from LEP and the Tevatron. Finally, an upper limit of 14.0 fb on the cross section is set at the 95% confidence level for events with a monophoton final state with photon transverse momentum greater than 145 GeV and missing transverse momentum greater than 140 GeV.
Search For New Physics In Final States With Low Transverse Energy Photon And Missing Transverse Energy In Proton Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2015
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 and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
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.
Signature Based Search For Delayed Photons In Exclusive Photon Plus Missing Transverse Energy Events From Pp Over Collisions With Sqrt S
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Author :
language : en
Publisher:
Release Date : 2013
Signature Based Search For Delayed Photons In Exclusive Photon Plus Missing Transverse Energy Events From Pp Over Collisions With Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Search For Universal Extra Dimensions In The Two Photon And Missing Transverse Energy Final State With The Atlas Detector
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Author : Baharak Fatholahzadeh
language : en
Publisher:
Release Date : 2012
Search For Universal Extra Dimensions In The Two Photon And Missing Transverse Energy Final State With The Atlas Detector written by Baharak Fatholahzadeh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Search For New Phenomena In Events With A Photon And Missing Transverse Momentum In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2016
Search For New Phenomena In Events With A Photon And Missing Transverse Momentum In Pp Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
In this paper, results of a search for new phenomena in events with an energetic photon and large missing transverse momentum with the ATLAS experiment at the Large Hadron Collider are reported. The data were collected in proton-proton collisions at a centre-of-mass energy of 13 TeV and correspond to an integrated luminosity of 3.2 fb-1. The observed data are in agreement with the Standard Model expectations. Exclusion limits are presented in models of new phenomena including pair production of dark matter candidates or large extra spatial dimensions. In a simplified model of dark matter and an axial-vector mediator, the search excludes mediator masses below 710 GeV for dark matter candidate masses below 150 GeV. In an effective theory of dark matter production, values of the suppression scale M * up to 570 GeV are excluded and the effect of truncation for various coupling values is reported. Finally, for the ADD large extra spatial dimension model the search places more stringent limits than earlier searches in the same event topology, excluding M D up to about 2.3 (2.8) TeV for two (six) additional spatial dimensions; the limits are reduced by 20-40% depending on the number of additional spatial dimensions when applying a truncation procedure.
Search For Large Extra Dimensions Via Single Photons Plus Missing Energy Final States At S 1 2
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Author :
language : en
Publisher:
Release Date : 2008
Search For Large Extra Dimensions Via Single Photons Plus Missing Energy Final States At S 1 2 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
This dissertation presents a search for large extra dimensions in the single photon plus missing transverse energy final states. We use a data sample of approximately 2.7 fb−1 of p{bar p} collisions at √s = 1.96 TeV (recorded with the D− detector) to investigate direct Kaluza Klein graviton production and set limits, at the 95% C.L., on the fundamental mass scale M{sub D} from 970 GeV to 816 GeV for two to eight extra dimensions.
Search For Large Extra Dimensions In The Exclusive Photon Missing Energy Channel In P Anti P Collisions
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Author : Jose A. Lazoflores
language : en
Publisher:
Release Date : 2006
Search For Large Extra Dimensions In The Exclusive Photon Missing Energy Channel In P Anti P Collisions written by Jose A. Lazoflores and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
A search was conducted for evidence of large extra dimensions (LED) at Fermi National Accelerator Laboratory's Tevatron using the D0 detector. The Tevatron is a p{bar p} collider at a center of mass energy of 1.96 TeV. Events with particles escaping into extra dimensions will have large missing energy. The search was carried out using data from a total luminosity of 197 {+-} 13 pb{sup -1} with an observable high transverse momentum photon and a large transverse missing energy. The 70 observed events are consistent with photons produced by standard known reactions plus other background processes produced by cosmic muons. The mass limits on the fundamental mass scale at 95% confidence level for large extra dimensions of 2, 4, 6 and 8 are 500 GeV, 581 GeV, 630 GeV, and 668 GeV respectively.